VDScript.cpp@ 53654

Last change on this file since 53654 was 52415, checked in by vboxsync, 10 years ago
Storage/tstVDIo: fixed a typo and use RT_STR_TUPLE()
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 103.4 KB

Line
1	/** $Id: VDScript.cpp 52415 2014-08-19 14:13:06Z vboxsync $ */
2	/** @file
3	*
4	* VBox HDD container test utility - scripting engine.
5	*/
6
7	/*
8	* Copyright (C) 2013 Oracle Corporation
9	*
10	* This file is part of VirtualBox Open Source Edition (OSE), as
11	* available from http://www.virtualbox.org. This file is free software;
12	* you can redistribute it and/or modify it under the terms of the GNU
13	* General Public License (GPL) as published by the Free Software
14	* Foundation, in version 2 as it comes in the "COPYING" file of the
15	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
16	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
17	*/
18
19	/** @page pg_vd_script VDScript - Simple scripting language for VD I/O testing.
20	*
21	* This component implements a very simple scripting language to make testing the VD
22	* library more flexible and testcases faster to implement without the need to recompile
23	* everything after it changed.
24	* The language is a small subset of the C language. It doesn't support unions, structs,
25	* global variables, typedefed types or pointers (yet). It also adds a boolean and a string type.
26	* Strings are immutable and only to print messages from the script.
27	* There are also not the default types like int or unsigned because theire ranges are architecture
28	* dependent. Instead VDScript uses uint8_t, int8_t, ... as primitive types.
29	*
30	* Why inventing a completely new language?
31	*
32	* Well it is not a completely new language to start with, it is a subset of C and the
33	* language can be extended later on to reach the full C language later on.
34	* Second, there is no static typed scripting language I like which could be implemented
35	* and finally because I can ;)
36	* The code implementing the scripting engine is designed to be easily incorporated into other
37	* code. Could be used as a scripting language for the VBox debugger for example or in the scm
38	* tool to automatically rewrite C code using the AST VDSCript generates...
39	*
40	* The syntax of VDSCript is derived from the C syntax. The syntax of C in BNF was taken
41	* from: http://www.csci.csusb.edu/dick/samples/c.syntax.html
42	* and: http://slps.github.com/zoo/c/iso-9899-tc3.html
43	* and: http://www.open-std.org/jtc1/sc22/WG14/www/docs/n1256.pdf
44	*/
45	#define LOGGROUP LOGGROUP_DEFAULT
46	#include <iprt/string.h>
47	#include <iprt/list.h>
48	#include <iprt/mem.h>
49	#include <iprt/ctype.h>
50	#include <iprt/stream.h>
51
52	#include <VBox/log.h>
53
54	#include "VDScriptAst.h"
55	#include "VDScriptInternal.h"
56
57	/**
58	* VD script token class.
59	*/
60	typedef enum VDTOKENCLASS
61	{
62	/** Invalid. */
63	VDTOKENCLASS_INVALID = 0,
64	/** Identifier class. */
65	VDTOKENCLASS_IDENTIFIER,
66	/** Numerical constant. */
67	VDTOKENCLASS_NUMCONST,
68	/** String constant. */
69	VDTOKENCLASS_STRINGCONST,
70	/** Operators */
71	VDTOKENCLASS_OPERATORS,
72	/** Reserved keyword */
73	VDTOKENCLASS_KEYWORD,
74	/** Punctuator */
75	VDTOKENCLASS_PUNCTUATOR,
76	/** End of stream */
77	VDTOKENCLASS_EOS,
78	/** 32bit hack. */
79	VDTOKENCLASS_32BIT_HACK = 0x7fffffff
80	} VDTOKENCLASS;
81	/** Pointer to a token class. */
82	typedef VDTOKENCLASS *PVDTOKENCLASS;
83
84	/**
85	* Keyword types.
86	*/
87	typedef enum VDSCRIPTTOKENKEYWORD
88	{
89	VDSCRIPTTOKENKEYWORD_INVALID = 0,
90	VDSCRIPTTOKENKEYWORD_CONTINUE,
91	VDSCRIPTTOKENKEYWORD_REGISTER,
92	VDSCRIPTTOKENKEYWORD_RESTRICT,
93	VDSCRIPTTOKENKEYWORD_VOLATILE,
94	VDSCRIPTTOKENKEYWORD_TYPEDEF,
95	VDSCRIPTTOKENKEYWORD_DEFAULT,
96	VDSCRIPTTOKENKEYWORD_EXTERN,
97	VDSCRIPTTOKENKEYWORD_STATIC,
98	VDSCRIPTTOKENKEYWORD_RETURN,
99	VDSCRIPTTOKENKEYWORD_SWITCH,
100	VDSCRIPTTOKENKEYWORD_STRUCT,
101	VDSCRIPTTOKENKEYWORD_WHILE,
102	VDSCRIPTTOKENKEYWORD_BREAK,
103	VDSCRIPTTOKENKEYWORD_CONST,
104	VDSCRIPTTOKENKEYWORD_FALSE,
105	VDSCRIPTTOKENKEYWORD_TRUE,
106	VDSCRIPTTOKENKEYWORD_ELSE,
107	VDSCRIPTTOKENKEYWORD_CASE,
108	VDSCRIPTTOKENKEYWORD_AUTO,
109	VDSCRIPTTOKENKEYWORD_FOR,
110	VDSCRIPTTOKENKEYWORD_IF,
111	VDSCRIPTTOKENKEYWORD_DO,
112	VDSCRIPTTOKENKEYWORD_32BIT_HACK = 0x7fffffff
113	} VDSCRIPTTOKENKEYWORD;
114	/** Pointer to a keyword type. */
115	typedef VDSCRIPTTOKENKEYWORD *PVDSCRIPTTOKENKEYWORD;
116
117	/**
118	* VD script token.
119	*/
120	typedef struct VDSCRIPTTOKEN
121	{
122	/** Token class. */
123	VDTOKENCLASS enmClass;
124	/** Token position in the source buffer. */
125	VDSRCPOS Pos;
126	/** Data based on the token class. */
127	union
128	{
129	/** Identifier. */
130	struct
131	{
132	/** Pointer to the start of the identifier. */
133	const char *pszIde;
134	/** Number of characters for the identifier excluding the null terminator. */
135	size_t cchIde;
136	} Ide;
137	/** Numerical constant. */
138	struct
139	{
140	uint64_t u64;
141	} NumConst;
142	/** String constant */
143	struct
144	{
145	/** Pointer to the start of the string constant. */
146	const char *pszString;
147	/** Number of characters of the string, including the null terminator. */
148	size_t cchString;
149	} StringConst;
150	/** Operator */
151	struct
152	{
153	/** The operator string. */
154	char aszOp[4]; /** Maximum of 3 for >>= + null terminator. */
155	} Operator;
156	/** Keyword. */
157	struct
158	{
159	/** The keyword type. */
160	VDSCRIPTTOKENKEYWORD enmKeyword;
161	} Keyword;
162	/** Punctuator. */
163	struct
164	{
165	/** The punctuator in question. */
166	char chPunctuator;
167	} Punctuator;
168	} Class;
169	} VDSCRIPTTOKEN;
170	/** Pointer to a script token. */
171	typedef VDSCRIPTTOKEN *PVDSCRIPTTOKEN;
172	/** Pointer to a const script token. */
173	typedef const VDSCRIPTTOKEN *PCVDSCRIPTTOKEN;
174
175	/**
176	* Tokenizer state.
177	*/
178	typedef struct VDTOKENIZER
179	{
180	/** Char buffer to read from. */
181	const char *pszInput;
182	/** Current position ininput buffer. */
183	VDSRCPOS Pos;
184	/** Token 1. */
185	VDSCRIPTTOKEN Token1;
186	/** Token 2. */
187	VDSCRIPTTOKEN Token2;
188	/** Pointer to the current active token. */
189	PVDSCRIPTTOKEN pTokenCurr;
190	/** The next token in the input stream (used for peeking). */
191	PVDSCRIPTTOKEN pTokenNext;
192	} VDTOKENIZER;
193
194	/**
195	* Operators entry.
196	*/
197	typedef struct VDSCRIPTOP
198	{
199	/** Operator string. */
200	const char *pszOp;
201	/** Size of the operator in characters without zero terminator. */
202	size_t cchOp;
203	} VDSCRIPTOP;
204	/** Pointer to a script operator. */
205	typedef VDSCRIPTOP *PVDSCRIPTOP;
206
207	/**
208	* Known operators array, sort from higest character count to lowest.
209	*/
210	static VDSCRIPTOP g_aScriptOps[] =
211	{
212	{">>=", 3},
213	{"<<=", 3},
214	{"+=", 2},
215	{"-=", 2},
216	{"/=", 2},
217	{"%=", 2},
218	{"&=", 2},
219	{"\|=", 2},
220	{"^=", 2},
221	{"&&", 2},
222	{"\|\|", 2},
223	{"<<", 2},
224	{">>", 2},
225	{"++", 2},
226	{"--", 2},
227	{"==", 2},
228	{"!=", 2},
229	{">=", 2},
230	{"<=", 2},
231	{"->", 2},
232	{"=", 1},
233	{"+", 1},
234	{"-", 1},
235	{"*", 1},
236	{"/", 1},
237	{"%", 1},
238	{"\|", 1},
239	{"&", 1},
240	{"^", 1},
241	{"<", 1},
242	{">", 1},
243	{"!", 1},
244	{"~", 1},
245	{".", 1}
246	};
247
248	/**
249	* Known punctuators.
250	*/
251	static VDSCRIPTOP g_aScriptPunctuators[] =
252	{
253	{"(", 1},
254	{")", 1},
255	{"{", 1},
256	{"}", 1},
257	{",", 1},
258	{";", 1},
259	};
260
261	/**
262	* Keyword entry.
263	*/
264	typedef struct VDSCRIPTKEYWORD
265	{
266	/** Keyword string. */
267	const char *pszKeyword;
268	/** Size of the string in characters without zero terminator. */
269	size_t cchKeyword;
270	/** Keyword type. */
271	VDSCRIPTTOKENKEYWORD enmKeyword;
272	} VDSCRIPTKEYWORD;
273	/** */
274	typedef VDSCRIPTKEYWORD *PVDSCRIPTKEYWORD;
275
276	/**
277	* Known keywords.
278	*/
279	static VDSCRIPTKEYWORD g_aKeywords[] =
280	{
281	{RT_STR_TUPLE("continue"), VDSCRIPTTOKENKEYWORD_CONTINUE},
282	{RT_STR_TUPLE("register"), VDSCRIPTTOKENKEYWORD_REGISTER},
283	{RT_STR_TUPLE("restrict"), VDSCRIPTTOKENKEYWORD_RESTRICT},
284	{RT_STR_TUPLE("volatile"), VDSCRIPTTOKENKEYWORD_VOLATILE},
285	{RT_STR_TUPLE("typedef"), VDSCRIPTTOKENKEYWORD_TYPEDEF},
286	{RT_STR_TUPLE("default"), VDSCRIPTTOKENKEYWORD_DEFAULT},
287	{RT_STR_TUPLE("extern"), VDSCRIPTTOKENKEYWORD_EXTERN},
288	{RT_STR_TUPLE("static"), VDSCRIPTTOKENKEYWORD_STATIC},
289	{RT_STR_TUPLE("return"), VDSCRIPTTOKENKEYWORD_RETURN},
290	{RT_STR_TUPLE("switch"), VDSCRIPTTOKENKEYWORD_SWITCH},
291	{RT_STR_TUPLE("struct"), VDSCRIPTTOKENKEYWORD_STRUCT},
292	{RT_STR_TUPLE("while"), VDSCRIPTTOKENKEYWORD_WHILE},
293	{RT_STR_TUPLE("break"), VDSCRIPTTOKENKEYWORD_BREAK},
294	{RT_STR_TUPLE("const"), VDSCRIPTTOKENKEYWORD_CONST},
295	{RT_STR_TUPLE("false"), VDSCRIPTTOKENKEYWORD_FALSE},
296	{RT_STR_TUPLE("true"), VDSCRIPTTOKENKEYWORD_TRUE},
297	{RT_STR_TUPLE("else"), VDSCRIPTTOKENKEYWORD_ELSE},
298	{RT_STR_TUPLE("case"), VDSCRIPTTOKENKEYWORD_CASE},
299	{RT_STR_TUPLE("auto"), VDSCRIPTTOKENKEYWORD_AUTO},
300	{RT_STR_TUPLE("for"), VDSCRIPTTOKENKEYWORD_FOR},
301	{RT_STR_TUPLE("if"), VDSCRIPTTOKENKEYWORD_IF},
302	{RT_STR_TUPLE("do"), VDSCRIPTTOKENKEYWORD_DO}
303	};
304
305	static int vdScriptParseCompoundStatement(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTSTMT *ppAstNodeCompound);
306	static int vdScriptParseStatement(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTSTMT *ppAstNodeStmt);
307	static int vdScriptParseExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr);
308	static int vdScriptParseAssignmentExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr);
309	static int vdScriptParseCastExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr);
310	static int vdScriptParseConstExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr);
311
312	/**
313	* Returns whether the tokenizer reached the end of the stream.
314	*
315	* @returns true if the tokenizer reached the end of stream marker
316	* false otherwise.
317	* @param pTokenizer The tokenizer state.
318	*/
319	DECLINLINE(bool) vdScriptTokenizerIsEos(PVDTOKENIZER pTokenizer)
320	{
321	return *pTokenizer->pszInput == '\0';
322	}
323
324	/**
325	* Skip one character in the input stream.
326	*
327	* @returns nothing.
328	* @param pTokenizer The tokenizer state.
329	*/
330	DECLINLINE(void) vdScriptTokenizerSkipCh(PVDTOKENIZER pTokenizer)
331	{
332	pTokenizer->pszInput++;
333	pTokenizer->Pos.iChStart++;
334	pTokenizer->Pos.iChEnd++;
335	}
336
337	/**
338	* Returns the next char in the input buffer without advancing it.
339	*
340	* @returns Next character in the input buffer.
341	* @param pTokenizer The tokenizer state.
342	*/
343	DECLINLINE(char) vdScriptTokenizerPeekCh(PVDTOKENIZER pTokenizer)
344	{
345	return vdScriptTokenizerIsEos(pTokenizer)
346	? '\0'
347	: *(pTokenizer->pszInput + 1);
348	}
349
350	/**
351	* Returns the next character in the input buffer advancing the internal
352	* position.
353	*
354	* @returns Next character in the stream.
355	* @param pTokenizer The tokenizer state.
356	*/
357	DECLINLINE(char) vdScriptTokenizerGetCh(PVDTOKENIZER pTokenizer)
358	{
359	char ch;
360
361	if (vdScriptTokenizerIsEos(pTokenizer))
362	ch = '\0';
363	else
364	ch = *pTokenizer->pszInput;
365
366	return ch;
367	}
368
369	/**
370	* Sets a new line for the tokenizer.
371	*
372	* @returns nothing.
373	* @param pTokenizer The tokenizer state.
374	*/
375	DECLINLINE(void) vdScriptTokenizerNewLine(PVDTOKENIZER pTokenizer, unsigned cSkip)
376	{
377	pTokenizer->pszInput += cSkip;
378	pTokenizer->Pos.iLine++;
379	pTokenizer->Pos.iChStart = 1;
380	pTokenizer->Pos.iChEnd = 1;
381	}
382
383	/**
384	* Checks whether the current position in the input stream is a new line
385	* and skips it.
386	*
387	* @returns Flag whether there was a new line at the current position
388	* in the input buffer.
389	* @param pTokenizer The tokenizer state.
390	*/
391	DECLINLINE(bool) vdScriptTokenizerIsSkipNewLine(PVDTOKENIZER pTokenizer)
392	{
393	bool fNewline = true;
394
395	if ( vdScriptTokenizerGetCh(pTokenizer) == '\r'
396	&& vdScriptTokenizerPeekCh(pTokenizer) == '\n')
397	vdScriptTokenizerNewLine(pTokenizer, 2);
398	else if (vdScriptTokenizerGetCh(pTokenizer) == '\n')
399	vdScriptTokenizerNewLine(pTokenizer, 1);
400	else
401	fNewline = false;
402
403	return fNewline;
404	}
405
406	/**
407	* Skips a multi line comment.
408	*
409	* @returns nothing.
410	* @param pTokenizer The tokenizer state.
411	*/
412	DECLINLINE(void) vdScriptTokenizerSkipComment(PVDTOKENIZER pTokenizer)
413	{
414	while ( !vdScriptTokenizerIsEos(pTokenizer)
415	&& ( vdScriptTokenizerGetCh(pTokenizer) != '*'
416	\|\| vdScriptTokenizerPeekCh(pTokenizer) != '/'))
417	{
418	if (!vdScriptTokenizerIsSkipNewLine(pTokenizer))
419	vdScriptTokenizerSkipCh(pTokenizer);
420	}
421
422	if (!vdScriptTokenizerIsEos(pTokenizer))
423	vdScriptTokenizerSkipCh(pTokenizer);
424	if (!vdScriptTokenizerIsEos(pTokenizer))
425	vdScriptTokenizerSkipCh(pTokenizer);
426	}
427
428	/**
429	* Skip all whitespace starting from the current input buffer position.
430	* Skips all present comments too.
431	*
432	* @returns nothing.
433	* @param pTokenizer The tokenizer state.
434	*/
435	DECLINLINE(void) vdScriptTokenizerSkipWhitespace(PVDTOKENIZER pTokenizer)
436	{
437	while (!vdScriptTokenizerIsEos(pTokenizer))
438	{
439	while ( vdScriptTokenizerGetCh(pTokenizer) == ' '
440	\|\| vdScriptTokenizerGetCh(pTokenizer) == '\t')
441	vdScriptTokenizerSkipCh(pTokenizer);
442
443	if ( !vdScriptTokenizerIsEos(pTokenizer)
444	&& !vdScriptTokenizerIsSkipNewLine(pTokenizer))
445	{
446	if ( vdScriptTokenizerGetCh(pTokenizer) == '/'
447	&& vdScriptTokenizerPeekCh(pTokenizer) == '*')
448	{
449	vdScriptTokenizerSkipCh(pTokenizer);
450	vdScriptTokenizerSkipCh(pTokenizer);
451	vdScriptTokenizerSkipComment(pTokenizer);
452	}
453	else
454	break; /* Skipped everything, next is some real content. */
455	}
456	}
457	}
458
459	/**
460	* Get an identifier token from the tokenizer.
461	*
462	* @returns nothing.
463	* @param pTokenizer The tokenizer state.
464	* @param pToken The uninitialized token.
465	*/
466	static void vdScriptTokenizerGetIdeOrKeyword(PVDTOKENIZER pTokenizer, PVDSCRIPTTOKEN pToken)
467	{
468	char ch;
469	size_t cchIde = 0;
470	bool fIsKeyword = false;
471	const char *pszIde = pTokenizer->pszInput;
472
473	pToken->Pos = pTokenizer->Pos;
474
475	Assert(RT_C_IS_ALPHA(pszIde) \|\| pszIde == '_' );
476
477	do
478	{
479	cchIde++;
480	vdScriptTokenizerSkipCh(pTokenizer);
481	ch = vdScriptTokenizerGetCh(pTokenizer);
482	}
483	while (RT_C_IS_ALNUM(ch) \|\| ch == '_');
484
485	/* Check whether we got an identifier or an reserved keyword. */
486	for (unsigned i = 0; i < RT_ELEMENTS(g_aKeywords); i++)
487	{
488	if (!RTStrNCmp(g_aKeywords[i].pszKeyword, pszIde, g_aKeywords[i].cchKeyword))
489	{
490	fIsKeyword = true;
491	pToken->enmClass = VDTOKENCLASS_KEYWORD;
492	pToken->Class.Keyword.enmKeyword = g_aKeywords[i].enmKeyword;
493	break;
494	}
495	}
496
497	if (!fIsKeyword)
498	{
499	pToken->enmClass = VDTOKENCLASS_IDENTIFIER;
500	pToken->Class.Ide.pszIde = pszIde;
501	pToken->Class.Ide.cchIde = cchIde;
502	}
503	pToken->Pos.iChEnd += cchIde;
504	}
505
506	/**
507	* Get a numerical constant from the tokenizer.
508	*
509	* @returns nothing.
510	* @param pTokenizer The tokenizer state.
511	* @param pToken The uninitialized token.
512	*/
513	static void vdScriptTokenizerGetNumberConst(PVDTOKENIZER pTokenizer, PVDSCRIPTTOKEN pToken)
514	{
515	unsigned uBase = 10;
516	char *pszNext = NULL;
517
518	Assert(RT_C_IS_DIGIT(vdScriptTokenizerGetCh(pTokenizer)));
519
520	/* Let RTStrToUInt64Ex() do all the work, looks C compliant :). */
521	pToken->enmClass = VDTOKENCLASS_NUMCONST;
522	int rc = RTStrToUInt64Ex(pTokenizer->pszInput, &pszNext, 0, &pToken->Class.NumConst.u64);
523	Assert(RT_SUCCESS(rc) \|\| rc == VWRN_TRAILING_CHARS \|\| rc == VWRN_TRAILING_SPACES);
524	/** @todo: Handle number to big, throw a warning */
525
526	unsigned cchNumber = pszNext - pTokenizer->pszInput;
527	for (unsigned i = 0; i < cchNumber; i++)
528	vdScriptTokenizerSkipCh(pTokenizer);
529
530	/* Check for a supported suffix, supported are K\|M\|G. */
531	if (vdScriptTokenizerGetCh(pTokenizer) == 'K')
532	{
533	pToken->Class.NumConst.u64 *= _1K;
534	vdScriptTokenizerSkipCh(pTokenizer);
535	}
536	else if (vdScriptTokenizerGetCh(pTokenizer) == 'M')
537	{
538	pToken->Class.NumConst.u64 *= _1M;
539	vdScriptTokenizerSkipCh(pTokenizer);
540	}
541	else if (vdScriptTokenizerGetCh(pTokenizer) == 'G')
542	{
543	pToken->Class.NumConst.u64 *= _1G;
544	vdScriptTokenizerSkipCh(pTokenizer);
545	}
546	else if (vdScriptTokenizerGetCh(pTokenizer) == 'T')
547	{
548	pToken->Class.NumConst.u64 *= _1T;
549	vdScriptTokenizerSkipCh(pTokenizer);
550	}
551	}
552
553	/**
554	* Parses a string constant.
555	*
556	* @returns nothing.
557	* @param pTokenizer The tokenizer state.
558	* @param pToken The uninitialized token.
559	*
560	* @remarks: No escape sequences allowed at this time.
561	*/
562	static void vdScriptTokenizerGetStringConst(PVDTOKENIZER pTokenizer, PVDSCRIPTTOKEN pToken)
563	{
564	size_t cchStr = 0;
565
566	Assert(vdScriptTokenizerGetCh(pTokenizer) == '\"');
567	vdScriptTokenizerSkipCh(pTokenizer); /* Skip " */
568
569	pToken->enmClass = VDTOKENCLASS_STRINGCONST;
570	pToken->Pos = pTokenizer->Pos;
571	pToken->Class.StringConst.pszString = pTokenizer->pszInput;
572
573	while (vdScriptTokenizerGetCh(pTokenizer) != '\"')
574	{
575	cchStr++;
576	vdScriptTokenizerSkipCh(pTokenizer);
577	}
578
579	vdScriptTokenizerSkipCh(pTokenizer); /* Skip closing " */
580
581	pToken->Class.StringConst.cchString = cchStr;
582	pToken->Pos.iChEnd += cchStr;
583	}
584
585	/**
586	* Get the end of stream token.
587	*
588	* @returns nothing.
589	* @param pTokenizer The tokenizer state.
590	* @param pToken The uninitialized token.
591	*/
592	static void vdScriptTokenizerGetEos(PVDTOKENIZER pTokenizer, PVDSCRIPTTOKEN pToken)
593	{
594	Assert(vdScriptTokenizerGetCh(pTokenizer) == '\0');
595
596	pToken->enmClass = VDTOKENCLASS_EOS;
597	pToken->Pos = pTokenizer->Pos;
598	}
599
600	/**
601	* Get operator or punctuator token.
602	*
603	* @returns nothing.
604	* @param pTokenizer The tokenizer state.
605	* @param pToken The uninitialized token.
606	*/
607	static void vdScriptTokenizerGetOperatorOrPunctuator(PVDTOKENIZER pTokenizer, PVDSCRIPTTOKEN pToken)
608	{
609	bool fOpFound = false;
610
611	pToken->enmClass = VDTOKENCLASS_INVALID;
612	pToken->Pos = pTokenizer->Pos;
613
614	/*
615	* Use table based approach here, not the fastest solution but enough for our purpose
616	* for now.
617	*/
618	for (unsigned i = 0; i < RT_ELEMENTS(g_aScriptOps); i++)
619	{
620	if (!RTStrNCmp(g_aScriptOps[i].pszOp, pTokenizer->pszInput, g_aScriptOps[i].cchOp))
621	{
622	memset(pToken->Class.Operator.aszOp, 0, sizeof(pToken->Class.Operator.aszOp));
623
624	int rc = RTStrCopy(pToken->Class.Operator.aszOp, sizeof(pToken->Class.Operator.aszOp), g_aScriptOps[i].pszOp);
625	AssertRC(rc);
626
627	pToken->enmClass = VDTOKENCLASS_OPERATORS;
628	pToken->Pos.iChEnd += g_aScriptOps[i].cchOp;
629
630	/** @todo: Make this prettier. */
631	for (unsigned j = 0; j < g_aScriptOps[i].cchOp; j++)
632	vdScriptTokenizerSkipCh(pTokenizer);
633	fOpFound = true;
634	break;
635	}
636	}
637
638	if (!fOpFound)
639	{
640	for (unsigned i = 0; i < RT_ELEMENTS(g_aScriptPunctuators); i++)
641	{
642	if (!RTStrNCmp(g_aScriptPunctuators[i].pszOp, pTokenizer->pszInput, g_aScriptPunctuators[i].cchOp))
643	{
644	pToken->Pos.iChEnd += g_aScriptPunctuators[i].cchOp;
645	pToken->enmClass = VDTOKENCLASS_PUNCTUATOR;
646	pToken->Class.Punctuator.chPunctuator = *g_aScriptPunctuators[i].pszOp;
647
648	vdScriptTokenizerSkipCh(pTokenizer);
649	fOpFound = true;
650	break;
651	}
652	}
653	}
654	}
655
656	/**
657	* Read the next token from the tokenizer stream.
658	*
659	* @returns nothing.
660	* @param pTokenizer The tokenizer to read from.
661	* @param pToken Uninitialized token to fill the token data into.
662	*/
663	static void vdScriptTokenizerReadNextToken(PVDTOKENIZER pTokenizer, PVDSCRIPTTOKEN pToken)
664	{
665	/* Skip all eventually existing whitespace, newlines and comments first. */
666	vdScriptTokenizerSkipWhitespace(pTokenizer);
667
668	char ch = vdScriptTokenizerGetCh(pTokenizer);
669	if (RT_C_IS_ALPHA(ch) \|\| ch == '_')
670	vdScriptTokenizerGetIdeOrKeyword(pTokenizer, pToken);
671	else if (RT_C_IS_DIGIT(ch))
672	vdScriptTokenizerGetNumberConst(pTokenizer, pToken);
673	else if (ch == '\"')
674	vdScriptTokenizerGetStringConst(pTokenizer, pToken);
675	else if (ch == '\0')
676	vdScriptTokenizerGetEos(pTokenizer, pToken);
677	else
678	vdScriptTokenizerGetOperatorOrPunctuator(pTokenizer, pToken);
679	}
680
681	/**
682	* Create a new tokenizer.
683	*
684	* @returns Pointer to the new tokenizer state on success.
685	* NULL if out of memory.
686	* @param pszInput The input to create the tokenizer for.
687	*/
688	static PVDTOKENIZER vdScriptTokenizerCreate(const char *pszInput)
689	{
690	PVDTOKENIZER pTokenizer = (PVDTOKENIZER)RTMemAllocZ(sizeof(VDTOKENIZER));
691	if (pTokenizer)
692	{
693	pTokenizer->pszInput = pszInput;
694	pTokenizer->Pos.iLine = 1;
695	pTokenizer->Pos.iChStart = 1;
696	pTokenizer->Pos.iChEnd = 1;
697	pTokenizer->pTokenCurr = &pTokenizer->Token1;
698	pTokenizer->pTokenNext = &pTokenizer->Token2;
699	/* Fill the tokenizer with two first tokens. */
700	vdScriptTokenizerReadNextToken(pTokenizer, pTokenizer->pTokenCurr);
701	vdScriptTokenizerReadNextToken(pTokenizer, pTokenizer->pTokenNext);
702	}
703
704	return pTokenizer;
705	}
706
707	/**
708	* Destroys a given tokenizer state.
709	*
710	* @returns nothing.
711	* @param pTokenizer The tokenizer to destroy.
712	*/
713	static void vdScriptTokenizerDestroy(PVDTOKENIZER pTokenizer)
714	{
715	RTMemFree(pTokenizer);
716	}
717
718	/**
719	* Get the current token in the input stream.
720	*
721	* @returns Pointer to the next token in the stream.
722	* @param pTokenizer The tokenizer to destroy.
723	*/
724	DECLINLINE(PCVDSCRIPTTOKEN) vdScriptTokenizerGetToken(PVDTOKENIZER pTokenizer)
725	{
726	return pTokenizer->pTokenCurr;
727	}
728
729	/**
730	* Get the class of the current token.
731	*
732	* @returns Class of the current token.
733	* @param pTokenizer The tokenizer state.
734	*/
735	DECLINLINE(VDTOKENCLASS) vdScriptTokenizerGetTokenClass(PVDTOKENIZER pTokenizer)
736	{
737	return pTokenizer->pTokenCurr->enmClass;
738	}
739
740	/**
741	* Returns the token class of the next token in the stream.
742	*
743	* @returns Token class of the next token.
744	* @param pTokenizer The tokenizer state.
745	*/
746	DECLINLINE(VDTOKENCLASS) vdScriptTokenizerPeekNextClass(PVDTOKENIZER pTokenizer)
747	{
748	return pTokenizer->pTokenNext->enmClass;
749	}
750
751	/**
752	* Consume the current token advancing to the next in the stream.
753	*
754	* @returns nothing.
755	* @param pTokenizer The tokenizer state.
756	*/
757	static void vdScriptTokenizerConsume(PVDTOKENIZER pTokenizer)
758	{
759	PVDSCRIPTTOKEN pTokenTmp = pTokenizer->pTokenCurr;
760
761	/* Switch next token to current token and read in the next token. */
762	pTokenizer->pTokenCurr = pTokenizer->pTokenNext;
763	pTokenizer->pTokenNext = pTokenTmp;
764	vdScriptTokenizerReadNextToken(pTokenizer, pTokenizer->pTokenNext);
765	}
766
767	/**
768	* Check whether the next token in the input stream is a punctuator and matches the given
769	* character.
770	*
771	* @returns true if the token matched.
772	* false otherwise.
773	* @param pTokenizer The tokenizer state.
774	* @param chCheck The punctuator to check against.
775	*/
776	static bool vdScriptTokenizerIsPunctuatorEqual(PVDTOKENIZER pTokenizer, char chCheck)
777	{
778	PCVDSCRIPTTOKEN pToken = vdScriptTokenizerGetToken(pTokenizer);
779
780	if ( pToken->enmClass == VDTOKENCLASS_PUNCTUATOR
781	&& pToken->Class.Punctuator.chPunctuator == chCheck)
782	return true;
783
784	return false;
785	}
786
787	/**
788	* Check whether the next token in the input stream is a punctuator and matches the given
789	* character and skips it.
790	*
791	* @returns true if the token matched and was skipped.
792	* false otherwise.
793	* @param pTokenizer The tokenizer state.
794	* @param chCheck The punctuator to check against.
795	*/
796	static bool vdScriptTokenizerSkipIfIsPunctuatorEqual(PVDTOKENIZER pTokenizer, char chCheck)
797	{
798	bool fEqual = vdScriptTokenizerIsPunctuatorEqual(pTokenizer, chCheck);
799	if (fEqual)
800	vdScriptTokenizerConsume(pTokenizer);
801
802	return fEqual;
803	}
804
805	/**
806	* Check whether the next token in the input stream is a keyword and matches the given
807	* keyword.
808	*
809	* @returns true if the token matched.
810	* false otherwise.
811	* @param pTokenizer The tokenizer state.
812	* @param enmKey The keyword to check against.
813	*/
814	static bool vdScriptTokenizerIsKeywordEqual(PVDTOKENIZER pTokenizer, VDSCRIPTTOKENKEYWORD enmKeyword)
815	{
816	PCVDSCRIPTTOKEN pToken = vdScriptTokenizerGetToken(pTokenizer);
817
818	if ( pToken->enmClass == VDTOKENCLASS_KEYWORD
819	&& pToken->Class.Keyword.enmKeyword == enmKeyword)
820	return true;
821
822	return false;
823	}
824
825	/**
826	* Check whether the next token in the input stream is a keyword and matches the given
827	* keyword and skips it.
828	*
829	* @returns true if the token matched and was skipped.
830	* false otherwise.
831	* @param pTokenizer The tokenizer state.
832	* @param enmKey The keyword to check against.
833	*/
834	static bool vdScriptTokenizerSkipIfIsKeywordEqual(PVDTOKENIZER pTokenizer, VDSCRIPTTOKENKEYWORD enmKeyword)
835	{
836	bool fEqual = vdScriptTokenizerIsKeywordEqual(pTokenizer, enmKeyword);
837	if (fEqual)
838	vdScriptTokenizerConsume(pTokenizer);
839
840	return fEqual;
841	}
842
843	/**
844	* Check whether the next token in the input stream is a keyword and matches the given
845	* keyword.
846	*
847	* @returns true if the token matched.
848	* false otherwise.
849	* @param pTokenizer The tokenizer state.
850	* @param pszOp The operation to check against.
851	*/
852	static bool vdScriptTokenizerIsOperatorEqual(PVDTOKENIZER pTokenizer, const char *pszOp)
853	{
854	PCVDSCRIPTTOKEN pToken = vdScriptTokenizerGetToken(pTokenizer);
855
856	if ( pToken->enmClass == VDTOKENCLASS_OPERATORS
857	&& !RTStrCmp(pToken->Class.Operator.aszOp, pszOp))
858	return true;
859
860	return false;
861	}
862
863	/**
864	* Check whether the next token in the input stream is an operator and matches the given
865	* keyword and skips it.
866	*
867	* @returns true if the token matched and was skipped.
868	* false otherwise.
869	* @param pTokenizer The tokenizer state.
870	* @param pszOp The operation to check against.
871	*/
872	static bool vdScriptTokenizerSkipIfIsOperatorEqual(PVDTOKENIZER pTokenizer, const char *pszOp)
873	{
874	bool fEqual = vdScriptTokenizerIsOperatorEqual(pTokenizer, pszOp);
875	if (fEqual)
876	vdScriptTokenizerConsume(pTokenizer);
877
878	return fEqual;
879	}
880
881	/**
882	* Record an error while parsing.
883	*
884	* @returns VBox status code passed.
885	*/
886	static int vdScriptParserError(PVDSCRIPTCTXINT pThis, int rc, RT_SRC_POS_DECL, const char *pszFmt, ...)
887	{
888	NOREF(pThis);
889	NOREF(pszFmt);
890	RTPrintf(pszFmt);
891	return rc;
892	}
893
894	/**
895	* Puts the next identifier AST node on the stack.
896	*
897	* @returns VBox status code.
898	* @param pThis The script context.
899	* @param ppAstNodeIde Where to store the identifier AST node on success.
900	*/
901	static int vdScriptParseIde(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTIDE *ppAstNodeIde)
902	{
903	int rc = VINF_SUCCESS;
904	PCVDSCRIPTTOKEN pToken;
905
906	LogFlowFunc(("pThis=%p ppAstNodeIde=%p\n", pThis, ppAstNodeIde));
907
908	pToken = vdScriptTokenizerGetToken(pThis->pTokenizer);
909	if (pToken->enmClass != VDTOKENCLASS_IDENTIFIER)
910	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected identifer got...\n");
911	else
912	{
913	/* Create new AST node and push onto stack. */
914	PVDSCRIPTASTIDE pAstNodeIde = vdScriptAstNodeIdeAlloc(pToken->Class.Ide.cchIde);
915	if (pAstNodeIde)
916	{
917	rc = RTStrCopyEx(pAstNodeIde->aszIde, pToken->Class.Ide.cchIde + 1, pToken->Class.Ide.pszIde, pToken->Class.Ide.cchIde);
918	AssertRC(rc);
919	pAstNodeIde->cchIde = pToken->Class.Ide.cchIde;
920
921	*ppAstNodeIde = pAstNodeIde;
922	vdScriptTokenizerConsume(pThis->pTokenizer);
923	}
924	else
925	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating identifier AST node\n");
926	}
927
928	LogFlowFunc(("returns %Rrc\n", rc));
929	return rc;
930	}
931
932	/**
933	* Parse a primary expression.
934	*
935	* @returns VBox status code.
936	* @param pThis The script context.
937	* @param ppAstNodeExpr Where to store the primary expression on success.
938	*/
939	static int vdScriptParsePrimaryExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
940	{
941	int rc = VINF_SUCCESS;
942
943	LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
944
945	if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '('))
946	{
947	rc = vdScriptParseExpression(pThis, ppAstNodeExpr);
948	if (RT_SUCCESS(rc)
949	&& !vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ')'))
950	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \")\", got ...\n");
951	}
952	else
953	{
954	PVDSCRIPTASTEXPR pExpr = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
955	if (pExpr)
956	{
957	if (vdScriptTokenizerGetTokenClass(pThis->pTokenizer) == VDTOKENCLASS_IDENTIFIER)
958	{
959	PVDSCRIPTASTIDE pIde = NULL;
960	rc = vdScriptParseIde(pThis, &pIde);
961	if (RT_SUCCESS(rc))
962	{
963	pExpr->enmType = VDSCRIPTEXPRTYPE_PRIMARY_IDENTIFIER;
964	pExpr->pIde = pIde;
965	}
966	}
967	else if (vdScriptTokenizerGetTokenClass(pThis->pTokenizer) == VDTOKENCLASS_NUMCONST)
968	{
969	PCVDSCRIPTTOKEN pToken = vdScriptTokenizerGetToken(pThis->pTokenizer);
970	pExpr->enmType = VDSCRIPTEXPRTYPE_PRIMARY_NUMCONST;
971	pExpr->u64 = pToken->Class.NumConst.u64;
972	vdScriptTokenizerConsume(pThis->pTokenizer);
973	}
974	else if (vdScriptTokenizerGetTokenClass(pThis->pTokenizer) == VDTOKENCLASS_STRINGCONST)
975	{
976	PCVDSCRIPTTOKEN pToken = vdScriptTokenizerGetToken(pThis->pTokenizer);
977	pExpr->enmType = VDSCRIPTEXPRTYPE_PRIMARY_STRINGCONST;
978	pExpr->pszStr = RTStrDupN(pToken->Class.StringConst.pszString, pToken->Class.StringConst.cchString);
979	vdScriptTokenizerConsume(pThis->pTokenizer);
980
981	if (!pExpr->pszStr)
982	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating string\n");
983	}
984	else if (vdScriptTokenizerGetTokenClass(pThis->pTokenizer) == VDTOKENCLASS_KEYWORD)
985	{
986	PCVDSCRIPTTOKEN pToken = vdScriptTokenizerGetToken(pThis->pTokenizer);
987	pExpr->enmType = VDSCRIPTEXPRTYPE_PRIMARY_BOOLEAN;
988
989	if (pToken->Class.Keyword.enmKeyword == VDSCRIPTTOKENKEYWORD_TRUE)
990	pExpr->f = true;
991	else if (pToken->Class.Keyword.enmKeyword == VDSCRIPTTOKENKEYWORD_FALSE)
992	pExpr->f = false;
993	else
994	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Unexpected keyword, expected true or false\n");
995	vdScriptTokenizerConsume(pThis->pTokenizer);
996	}
997	else
998	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \"(\" \| identifier \| constant \| string, got ...\n");
999
1000	if (RT_FAILURE(rc))
1001	vdScriptAstNodeFree(&pExpr->Core);
1002	else
1003	*ppAstNodeExpr = pExpr;
1004	}
1005	else
1006	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1007	}
1008
1009	LogFlowFunc(("returns rc=%Rrc\n", rc));
1010	return rc;
1011	}
1012
1013	/**
1014	* Parse an argument list for a function call.
1015	*
1016	* @returns VBox status code.
1017	* @param pThis The script context.
1018	* @param pFnCall The function call AST node.
1019	*/
1020	static int vdScriptParseFnCallArgumentList(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR pFnCall)
1021	{
1022	int rc = VINF_SUCCESS;
1023	PVDSCRIPTASTEXPR pExpr = NULL;
1024
1025	LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
1026
1027	rc = vdScriptParseAssignmentExpression(pThis, &pExpr);
1028	if (RT_SUCCESS(rc))
1029	{
1030	RTListAppend(&pFnCall->FnCall.ListArgs, &pExpr->Core.ListNode);
1031	while (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ','))
1032	{
1033	rc = vdScriptParseAssignmentExpression(pThis, &pExpr);
1034	if (RT_SUCCESS(rc))
1035	RTListAppend(&pFnCall->FnCall.ListArgs, &pExpr->Core.ListNode);
1036	else
1037	break;
1038	}
1039	if ( RT_SUCCESS(rc)
1040	&& !vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ')'))
1041	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \")\", got ...\n");
1042	}
1043
1044	LogFlowFunc(("returns rc=%Rrc\n", rc));
1045	return rc;
1046	}
1047
1048	/**
1049	* Parse a postfix expression.
1050	*
1051	* @returns VBox status code.
1052	* @param pThis The script context.
1053	* @param ppAstNodeExpr Where to store the expression AST node on success.
1054	*
1055	* @note Syntax:
1056	* postfix-expression:
1057	* primary-expression
1058	* postfix-expression ( argument-expression )
1059	* postfix-expression ++
1060	* postfix-expression --
1061	* postfix-expression . identifier
1062	* postfix-expression -> identifier
1063	* @note: Not supported so far are:
1064	* ( type-name ) { initializer-list }
1065	* ( type-name ) { initializer-list , }
1066	*/
1067	static int vdScriptParsePostfixExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
1068	{
1069	int rc = VINF_SUCCESS;
1070	PVDSCRIPTASTEXPR pExpr = NULL;
1071
1072	LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
1073
1074	rc = vdScriptParsePrimaryExpression(pThis, &pExpr);
1075	if (RT_SUCCESS(rc))
1076	{
1077	while (true)
1078	{
1079	PVDSCRIPTASTEXPR pExprNew = NULL;
1080
1081	if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "++"))
1082	{
1083	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1084	if (pExprNew)
1085	{
1086	pExprNew->enmType = VDSCRIPTEXPRTYPE_POSTFIX_INCREMENT;
1087	pExprNew->pExpr = pExpr;
1088	pExpr = pExprNew;
1089	}
1090	else
1091	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1092	}
1093	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "--"))
1094	{
1095	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1096	if (pExprNew)
1097	{
1098	pExprNew->enmType = VDSCRIPTEXPRTYPE_POSTFIX_DECREMENT;
1099	pExprNew->pExpr = pExpr;
1100	pExpr = pExprNew;
1101	}
1102	else
1103	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1104	}
1105	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "->"))
1106	{
1107	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1108	if (pExprNew)
1109	{
1110	PVDSCRIPTASTIDE pIde = NULL;
1111	rc = vdScriptParseIde(pThis, &pIde);
1112	if (RT_SUCCESS(rc))
1113	{
1114	pExprNew->enmType = VDSCRIPTEXPRTYPE_POSTFIX_DEREFERENCE;
1115	pExprNew->Deref.pIde = pIde;
1116	pExprNew->Deref.pExpr = pExpr;
1117	pExpr = pExprNew;
1118	}
1119	else
1120	vdScriptAstNodeFree(&pExprNew->Core);
1121	}
1122	else
1123	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1124	}
1125	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "."))
1126	{
1127	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1128	if (pExprNew)
1129	{
1130	PVDSCRIPTASTIDE pIde = NULL;
1131	rc = vdScriptParseIde(pThis, &pIde);
1132	if (RT_SUCCESS(rc))
1133	{
1134	pExprNew->enmType = VDSCRIPTEXPRTYPE_POSTFIX_DOT;
1135	pExprNew->Deref.pIde = pIde;
1136	pExprNew->Deref.pExpr = pExpr;
1137	pExpr = pExprNew;
1138	}
1139	else
1140	vdScriptAstNodeFree(&pExprNew->Core);
1141	}
1142	else
1143	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1144	}
1145	else if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '('))
1146	{
1147	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1148	if (pExprNew)
1149	{
1150	pExprNew->enmType = VDSCRIPTEXPRTYPE_POSTFIX_FNCALL;
1151	RTListInit(&pExprNew->FnCall.ListArgs);
1152	if (!vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ')'))
1153	rc = vdScriptParseFnCallArgumentList(pThis, pExprNew);
1154	pExprNew->FnCall.pFnIde = pExpr;
1155	pExpr = pExprNew;
1156	}
1157	else
1158	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1159	}
1160	else
1161	break;
1162
1163	if (RT_FAILURE(rc))
1164	break;
1165	}
1166
1167	if (RT_SUCCESS(rc))
1168	*ppAstNodeExpr = pExpr;
1169	else
1170	vdScriptAstNodeFree(&pExpr->Core);
1171	}
1172
1173	LogFlowFunc(("returns rc=%Rrc\n", rc));
1174	return rc;
1175	}
1176
1177	/**
1178	* Parse an unary expression.
1179	*
1180	* @returns VBox status code.
1181	* @param pThis The script context.
1182	* @param ppAstNodeExpr Where to store the expression AST node on success.
1183	*
1184	* @note Syntax:
1185	* unary-expression:
1186	* postfix-expression
1187	* ++ unary-expression
1188	* -- unary-expression
1189	* + cast-expression
1190	* - cast-expression
1191	* ~ cast-expression
1192	* ! cast-expression
1193	* & cast-expression
1194	* * cast-expression
1195	*/
1196	static int vdScriptParseUnaryExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
1197	{
1198	int rc = VINF_SUCCESS;
1199	PVDSCRIPTASTEXPR pExpr = NULL;
1200	PVDSCRIPTASTEXPR pExprTop = NULL;
1201
1202	LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
1203
1204	/** @todo: Think about a more beautiful way of parsing this. */
1205	while (true)
1206	{
1207	bool fQuit = false;
1208	bool fCastExprFollows = false;
1209	PVDSCRIPTASTEXPR pExprNew = NULL;
1210	VDSCRIPTEXPRTYPE enmType = VDSCRIPTEXPRTYPE_INVALID;
1211
1212	if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "++"))
1213	enmType = VDSCRIPTEXPRTYPE_UNARY_INCREMENT;
1214	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "--"))
1215	enmType = VDSCRIPTEXPRTYPE_UNARY_DECREMENT;
1216	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "+"))
1217	{
1218	enmType = VDSCRIPTEXPRTYPE_UNARY_POSSIGN;
1219	fCastExprFollows = true;
1220	}
1221	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "-"))
1222	{
1223	enmType = VDSCRIPTEXPRTYPE_UNARY_NEGSIGN;
1224	fCastExprFollows = true;
1225	}
1226	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "~"))
1227	{
1228	enmType = VDSCRIPTEXPRTYPE_UNARY_INVERT;
1229	fCastExprFollows = true;
1230	}
1231	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "!"))
1232	{
1233	enmType = VDSCRIPTEXPRTYPE_UNARY_NEGATE;
1234	fCastExprFollows = true;
1235	}
1236	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "&"))
1237	{
1238	enmType = VDSCRIPTEXPRTYPE_UNARY_REFERENCE;
1239	fCastExprFollows = true;
1240	}
1241	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "*"))
1242	{
1243	enmType = VDSCRIPTEXPRTYPE_UNARY_DEREFERENCE;
1244	fCastExprFollows = true;
1245	}
1246
1247	if (enmType != VDSCRIPTEXPRTYPE_INVALID)
1248	{
1249	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1250	if (pExprNew)
1251	pExprNew->enmType = enmType;
1252	else
1253	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1254
1255	if ( RT_SUCCESS(rc)
1256	&& fCastExprFollows)
1257	{
1258	PVDSCRIPTASTEXPR pCastExpr = NULL;
1259
1260	rc = vdScriptParseCastExpression(pThis, &pCastExpr);
1261	if (RT_SUCCESS(rc))
1262	pExprNew->pExpr = pCastExpr;
1263	else
1264	vdScriptAstNodeFree(&pExprNew->Core);
1265	fQuit = true;
1266	}
1267	}
1268	else
1269	{
1270	/* Must be a postfix expression. */
1271	rc = vdScriptParsePostfixExpression(pThis, &pExprNew);
1272	fQuit = true;
1273	}
1274
1275	if (RT_SUCCESS(rc))
1276	{
1277	if (!pExprTop)
1278	{
1279	pExprTop = pExprNew;
1280	pExpr = pExprNew;
1281	}
1282	else
1283	{
1284	pExpr->pExpr = pExprNew;
1285	pExpr = pExprNew;
1286	}
1287	if (fQuit)
1288	break;
1289	}
1290	else
1291	break;
1292	}
1293
1294	if (RT_SUCCESS(rc))
1295	*ppAstNodeExpr = pExprTop;
1296	else if (pExprTop)
1297	vdScriptAstNodeFree(&pExprTop->Core);
1298
1299	LogFlowFunc(("returns rc=%Rrc\n", rc));
1300	return rc;
1301	}
1302
1303	/**
1304	* Parse a storage class specifier.
1305	*
1306	* @returns nothing.
1307	* @param pThis The script context.
1308	* @param penmStorageClass Where to return the parsed storage classe.
1309	* Contains VDSCRIPTASTSTORAGECLASS_INVALID if no
1310	* valid storage class specifier was found.
1311	*
1312	* @note Syntax:
1313	* typedef
1314	* extern
1315	* static
1316	* auto
1317	* register
1318	*/
1319	static void vdScriptParseStorageClassSpecifier(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTSTORAGECLASS penmStorageClass)
1320	{
1321	*penmStorageClass = VDSCRIPTASTSTORAGECLASS_INVALID;
1322
1323	if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_TYPEDEF))
1324	*penmStorageClass = VDSCRIPTASTSTORAGECLASS_TYPEDEF;
1325	else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_EXTERN))
1326	*penmStorageClass = VDSCRIPTASTSTORAGECLASS_EXTERN;
1327	else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_STATIC))
1328	*penmStorageClass = VDSCRIPTASTSTORAGECLASS_STATIC;
1329	else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_AUTO))
1330	*penmStorageClass = VDSCRIPTASTSTORAGECLASS_AUTO;
1331	else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_REGISTER))
1332	*penmStorageClass = VDSCRIPTASTSTORAGECLASS_REGISTER;
1333	}
1334
1335	/**
1336	* Parse a type qualifier.
1337	*
1338	* @returns nothing.
1339	* @param pThis The script context.
1340	* @param penmTypeQualifier Where to return the parsed type qualifier.
1341	* Contains VDSCRIPTASTTYPEQUALIFIER_INVALID if no
1342	* valid type qualifier was found.
1343	*
1344	* @note Syntax:
1345	* const
1346	* restrict
1347	* volatile
1348	*/
1349	static void vdScriptParseTypeQualifier(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTTYPEQUALIFIER penmTypeQualifier)
1350	{
1351	*penmTypeQualifier = VDSCRIPTASTTYPEQUALIFIER_INVALID;
1352
1353	if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_CONST))
1354	*penmTypeQualifier = VDSCRIPTASTTYPEQUALIFIER_CONST;
1355	else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_RESTRICT))
1356	*penmTypeQualifier = VDSCRIPTASTTYPEQUALIFIER_RESTRICT;
1357	else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_VOLATILE))
1358	*penmTypeQualifier = VDSCRIPTASTTYPEQUALIFIER_VOLATILE;
1359	}
1360
1361	#if 0
1362	/**
1363	* Parse a struct or union specifier.
1364	*
1365	* @returns VBox status code.
1366	* @param pThis The script context.
1367	* @param ppAstTypeSpec Where to store the type specifier AST node on success.
1368	* @param enmTypeSpecifier The type specifier to identify whete this is a struct or a union.
1369	*/
1370	static int vdScriptParseStructOrUnionSpecifier(PVDSCRIPTCTXINT pThis, , enmTypeSpecifier)
1371	{
1372	int rc = VINF_SUCCESS;
1373
1374	return rc;
1375	}
1376
1377	/**
1378	* Parse a type specifier.
1379	*
1380	* @returns VBox status code.
1381	* @param pThis The script context.
1382	* @param ppAstTypeSpec Where to store the type specifier AST node on success.
1383	*
1384	* @note Syntax:
1385	* struct-or-union-specifier
1386	* enum-specifier
1387	* typedef-name (identifier: includes void, bool, uint8_t, int8_t, ... for basic integer types)
1388	*/
1389	static int vdScriptParseTypeSpecifier(PVDSCRIPTCTXINT pThis, )
1390	{
1391	int rc = VINF_SUCCESS;
1392
1393	if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_STRUCT))
1394	rc = vdScriptParseStructOrUnionSpecifier(pThis, , VDSCRIPTASTTYPESPECIFIER_STRUCT);
1395	else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_UNION))
1396	rc = vdScriptParseStructOrUnionSpecifier(pThis, , VDSCRIPTASTTYPESPECIFIER_UNION);
1397	else
1398	{
1399	PVDSCRIPTASTIDE pIde = NULL;
1400
1401	rc = vdScriptParseIde(pThis, &pIde);
1402	if (RT_SUCCESS(rc))
1403	{
1404	AssertMsgFailed(("TODO\n")); /* Parse identifier. */
1405	}
1406	}
1407
1408	return rc;
1409	}
1410	#endif
1411
1412	/**
1413	* Parse a cast expression.
1414	*
1415	* @returns VBox status code.
1416	* @param pThis The script context.
1417	* @param ppAstNodeExpr Where to store the expression AST node on success.
1418	*
1419	* @note Syntax:
1420	* cast-expression:
1421	* unary-expression
1422	* ( type-name ) cast-expression
1423	*/
1424	static int vdScriptParseCastExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
1425	{
1426	int rc = VINF_SUCCESS;
1427	PVDSCRIPTASTEXPR pExpr = NULL;
1428
1429	LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
1430
1431	#if 0
1432	if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '('))
1433	{
1434	PVDSCRIPTASTTYPE pTypeName = NULL;
1435	rc = vdScriptParseTypeName(pThis, &pTypeName);
1436	if ( RT_SUCCESS(rc)
1437	&& vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ')'))
1438	{
1439	PVDSCRIPTASTEXPR pExpr = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1440	if (pExpr)
1441	{
1442	pExpr->enmType = VDSCRIPTEXPRTYPE_CAST;
1443	rc = vdScriptParseCastExpression(pThis, &pExpr->Cast.pExpr); /** @todo: Kill recursion. */
1444	if (RT_SUCCESS(rc))
1445	pExpr->Cast.pTypeName = pTypeName;
1446	else
1447	vdScriptAstNodeFree(&pExpr->Core);
1448	}
1449	else
1450	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1451
1452	if (RT_FAILURE(rc))
1453	vdScriptAstNodeFree(&pTypeName->Core);
1454	}
1455	else if (RT_SUCCESS(rc))
1456	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \")\", got ...\n");
1457	}
1458	else
1459	#endif
1460	rc = vdScriptParseUnaryExpression(pThis, ppAstNodeExpr);
1461
1462	return rc;
1463	}
1464
1465	/**
1466	* Parse a multiplicative expression.
1467	*
1468	* @returns VBox status code.
1469	* @param pThis The script context.
1470	* @param ppAstNodeExpr Where to store the expression AST node on success.
1471	*
1472	* @note Syntax:
1473	* multiplicative-expression:
1474	* cast-expression
1475	* multiplicative-expression * cast-expression
1476	* multiplicative-expression / cast-expression
1477	* multiplicative-expression % cast-expression
1478	*/
1479	static int vdScriptParseMultiplicativeExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
1480	{
1481	int rc = VINF_SUCCESS;
1482	PVDSCRIPTASTEXPR pExpr = NULL;
1483
1484	LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
1485
1486	rc = vdScriptParseCastExpression(pThis, &pExpr);
1487	if (RT_SUCCESS(rc))
1488	{
1489	while (RT_SUCCESS(rc))
1490	{
1491	VDSCRIPTEXPRTYPE enmType = VDSCRIPTEXPRTYPE_INVALID;
1492	PVDSCRIPTASTEXPR pExprNew = NULL;
1493
1494	if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "*"))
1495	enmType = VDSCRIPTEXPRTYPE_MULTIPLICATION;
1496	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "/"))
1497	enmType = VDSCRIPTEXPRTYPE_DIVISION;
1498	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "%"))
1499	enmType = VDSCRIPTEXPRTYPE_MODULUS;
1500	else
1501	break;
1502
1503	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1504	if (pExprNew)
1505	pExprNew->enmType = enmType;
1506	else
1507	{
1508	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1509	break;
1510	}
1511
1512	pExprNew->BinaryOp.pLeftExpr = pExpr;
1513	pExpr = pExprNew;
1514	rc = vdScriptParseCastExpression(pThis, &pExprNew);
1515	if (RT_SUCCESS(rc))
1516	pExpr->BinaryOp.pRightExpr = pExprNew;
1517	}
1518
1519	if (RT_SUCCESS(rc))
1520	*ppAstNodeExpr = pExpr;
1521	else
1522	vdScriptAstNodeFree(&pExpr->Core);
1523	}
1524
1525	LogFlowFunc(("returns rc=%Rrc\n", rc));
1526	return rc;
1527	}
1528
1529	/**
1530	* Parse a additive expression.
1531	*
1532	* @returns VBox status code.
1533	* @param pThis The script context.
1534	* @param ppAstNodeExpr Where to store the expression AST node on success.
1535	*
1536	* @note Syntax:
1537	* additive-expression:
1538	* multiplicative-expression
1539	* additive-expression + multiplicative-expression
1540	* additive-expression - multiplicative-expression
1541	*/
1542	static int vdScriptParseAdditiveExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
1543	{
1544	int rc = VINF_SUCCESS;
1545	PVDSCRIPTASTEXPR pExpr = NULL;
1546
1547	LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
1548
1549	rc = vdScriptParseMultiplicativeExpression(pThis, &pExpr);
1550	if (RT_SUCCESS(rc))
1551	{
1552	PVDSCRIPTASTEXPR pExprNew = NULL;
1553	while (RT_SUCCESS(rc))
1554	{
1555	if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "+"))
1556	{
1557	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1558	if (pExprNew)
1559	pExprNew->enmType = VDSCRIPTEXPRTYPE_ADDITION;
1560	else
1561	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1562	}
1563	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "-"))
1564	{
1565	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1566	if (pExprNew)
1567	pExprNew->enmType = VDSCRIPTEXPRTYPE_SUBTRACTION;
1568	else
1569	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1570	}
1571	else
1572	break;
1573
1574	pExprNew->BinaryOp.pLeftExpr = pExpr;
1575	pExpr = pExprNew;
1576	rc = vdScriptParseMultiplicativeExpression(pThis, &pExprNew);
1577	if (RT_SUCCESS(rc))
1578	pExpr->BinaryOp.pRightExpr = pExprNew;
1579	}
1580
1581	if (RT_SUCCESS(rc))
1582	*ppAstNodeExpr = pExpr;
1583	else
1584	vdScriptAstNodeFree(&pExpr->Core);
1585	}
1586
1587	LogFlowFunc(("returns rc=%Rrc\n", rc));
1588	return rc;
1589	}
1590
1591	/**
1592	* Parse a shift expression.
1593	*
1594	* @returns VBox status code.
1595	* @param pThis The script context.
1596	* @param ppAstNodeExpr Where to store the expression AST node on success.
1597	*
1598	* @note Syntax:
1599	* shift-expression:
1600	* additive-expression
1601	* shift-expression << additive-expression
1602	* shift-expression >> additive-expression
1603	*/
1604	static int vdScriptParseShiftExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
1605	{
1606	int rc = VINF_SUCCESS;
1607	PVDSCRIPTASTEXPR pExpr = NULL;
1608
1609	LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
1610
1611	rc = vdScriptParseAdditiveExpression(pThis, &pExpr);
1612	if (RT_SUCCESS(rc))
1613	{
1614	PVDSCRIPTASTEXPR pExprNew = NULL;
1615	while (RT_SUCCESS(rc))
1616	{
1617	if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "<<"))
1618	{
1619	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1620	if (pExprNew)
1621	pExprNew->enmType = VDSCRIPTEXPRTYPE_LSL;
1622	else
1623	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1624	}
1625	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, ">>"))
1626	{
1627	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1628	if (pExprNew)
1629	pExprNew->enmType = VDSCRIPTEXPRTYPE_LSR;
1630	else
1631	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1632	}
1633	else
1634	break;
1635
1636	pExprNew->BinaryOp.pLeftExpr = pExpr;
1637	pExpr = pExprNew;
1638	rc = vdScriptParseAdditiveExpression(pThis, &pExprNew);
1639	if (RT_SUCCESS(rc))
1640	pExpr->BinaryOp.pRightExpr = pExprNew;
1641	}
1642
1643	if (RT_SUCCESS(rc))
1644	*ppAstNodeExpr = pExpr;
1645	else
1646	vdScriptAstNodeFree(&pExpr->Core);
1647	}
1648
1649	LogFlowFunc(("returns rc=%Rrc\n", rc));
1650	return rc;
1651	}
1652
1653	/**
1654	* Parse a relational expression.
1655	*
1656	* @returns VBox status code.
1657	* @param pThis The script context.
1658	* @param ppAstNodeExpr Where to store the expression AST node on success.
1659	*
1660	* @note Syntax:
1661	* relational-expression:
1662	* shift-expression
1663	* relational-expression < shift-expression
1664	* relational-expression > shift-expression
1665	* relational-expression >= shift-expression
1666	* relational-expression <= shift-expression
1667	*/
1668	static int vdScriptParseRelationalExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
1669	{
1670	int rc = VINF_SUCCESS;
1671	PVDSCRIPTASTEXPR pExpr = NULL;
1672
1673	LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
1674
1675	rc = vdScriptParseShiftExpression(pThis, &pExpr);
1676	if (RT_SUCCESS(rc))
1677	{
1678	PVDSCRIPTASTEXPR pExprNew = NULL;
1679	while (RT_SUCCESS(rc))
1680	{
1681	if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "<"))
1682	{
1683	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1684	if (pExprNew)
1685	pExprNew->enmType = VDSCRIPTEXPRTYPE_LOWER;
1686	else
1687	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1688	}
1689	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, ">"))
1690	{
1691	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1692	if (pExprNew)
1693	pExprNew->enmType = VDSCRIPTEXPRTYPE_HIGHER;
1694	else
1695	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1696	}
1697	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, ">="))
1698	{
1699	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1700	if (pExprNew)
1701	pExprNew->enmType = VDSCRIPTEXPRTYPE_HIGHEREQUAL;
1702	else
1703	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1704	}
1705	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "<="))
1706	{
1707	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1708	if (pExprNew)
1709	pExprNew->enmType = VDSCRIPTEXPRTYPE_LOWEREQUAL;
1710	else
1711	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1712	}
1713	else
1714	break;
1715
1716	pExprNew->BinaryOp.pLeftExpr = pExpr;
1717	pExpr = pExprNew;
1718	rc = vdScriptParseShiftExpression(pThis, &pExprNew);
1719	if (RT_SUCCESS(rc))
1720	pExpr->BinaryOp.pRightExpr = pExprNew;
1721	}
1722
1723	if (RT_SUCCESS(rc))
1724	*ppAstNodeExpr = pExpr;
1725	else
1726	vdScriptAstNodeFree(&pExpr->Core);
1727	}
1728
1729	LogFlowFunc(("returns rc=%Rrc\n", rc));
1730	return rc;
1731	}
1732
1733	/**
1734	* Parse a equality expression.
1735	*
1736	* @returns VBox status code.
1737	* @param pThis The script context.
1738	* @param ppAstNodeExpr Where to store the expression AST node on success.
1739	*
1740	* @note Syntax:
1741	* equality-expression:
1742	* relational-expression
1743	* equality-expression == relational-expression
1744	* equality-expression != relational-expression
1745	*/
1746	static int vdScriptParseEqualityExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
1747	{
1748	int rc = VINF_SUCCESS;
1749	PVDSCRIPTASTEXPR pExpr = NULL;
1750
1751	LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
1752
1753	rc = vdScriptParseRelationalExpression(pThis, &pExpr);
1754	if (RT_SUCCESS(rc))
1755	{
1756	PVDSCRIPTASTEXPR pExprNew = NULL;
1757	while (RT_SUCCESS(rc))
1758	{
1759	if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "=="))
1760	{
1761	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1762	if (pExprNew)
1763	pExprNew->enmType = VDSCRIPTEXPRTYPE_EQUAL;
1764	else
1765	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1766	}
1767	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "!="))
1768	{
1769	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1770	if (pExprNew)
1771	pExprNew->enmType = VDSCRIPTEXPRTYPE_NOTEQUAL;
1772	else
1773	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1774	}
1775	else
1776	break;
1777
1778	pExprNew->BinaryOp.pLeftExpr = pExpr;
1779	pExpr = pExprNew;
1780	rc = vdScriptParseRelationalExpression(pThis, &pExprNew);
1781	if (RT_SUCCESS(rc))
1782	pExpr->BinaryOp.pRightExpr = pExprNew;
1783	}
1784
1785	if (RT_SUCCESS(rc))
1786	*ppAstNodeExpr = pExpr;
1787	else
1788	vdScriptAstNodeFree(&pExpr->Core);
1789	}
1790
1791	LogFlowFunc(("returns rc=%Rrc\n", rc));
1792	return rc;
1793	}
1794
1795	/**
1796	* Parse a bitwise and expression.
1797	*
1798	* @returns VBox status code.
1799	* @param pThis The script context.
1800	* @param ppAstNodeExpr Where to store the expression AST node on success.
1801	*
1802	* @note Syntax:
1803	* and-expression:
1804	* equality-expression
1805	* and-expression & equality-expression
1806	*/
1807	static int vdScriptParseBitwiseAndExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
1808	{
1809	int rc = VINF_SUCCESS;
1810	PVDSCRIPTASTEXPR pExpr = NULL;
1811
1812	LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
1813
1814	rc = vdScriptParseEqualityExpression(pThis, &pExpr);
1815	if (RT_SUCCESS(rc))
1816	{
1817	PVDSCRIPTASTEXPR pExprNew = NULL;
1818	while ( RT_SUCCESS(rc)
1819	&& vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "&"))
1820	{
1821	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1822	if (pExprNew)
1823	{
1824	pExprNew->enmType = VDSCRIPTEXPRTYPE_EQUAL;
1825	pExprNew->BinaryOp.pLeftExpr = pExpr;
1826	pExpr = pExprNew;
1827	rc = vdScriptParseEqualityExpression(pThis, &pExprNew);
1828	if (RT_SUCCESS(rc))
1829	pExpr->BinaryOp.pRightExpr = pExprNew;
1830	}
1831	else
1832	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1833	}
1834
1835	if (RT_SUCCESS(rc))
1836	*ppAstNodeExpr = pExpr;
1837	else
1838	vdScriptAstNodeFree(&pExpr->Core);
1839	}
1840
1841	LogFlowFunc(("returns rc=%Rrc\n", rc));
1842	return rc;
1843	}
1844
1845	/**
1846	* Parse a bitwise xor expression.
1847	*
1848	* @returns VBox status code.
1849	* @param pThis The script context.
1850	* @param ppAstNodeExpr Where to store the expression AST node on success.
1851	*
1852	* @note Syntax:
1853	* xor-expression:
1854	* and-expression
1855	* xor-expression ^ equality-expression
1856	*/
1857	static int vdScriptParseBitwiseXorExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
1858	{
1859	int rc = VINF_SUCCESS;
1860	PVDSCRIPTASTEXPR pExpr = NULL;
1861
1862	LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
1863
1864	rc = vdScriptParseBitwiseAndExpression(pThis, &pExpr);
1865	if (RT_SUCCESS(rc))
1866	{
1867	PVDSCRIPTASTEXPR pExprNew = NULL;
1868	while ( RT_SUCCESS(rc)
1869	&& vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "^"))
1870	{
1871	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1872	if (pExprNew)
1873	{
1874	pExprNew->enmType = VDSCRIPTEXPRTYPE_BITWISE_XOR;
1875	pExprNew->BinaryOp.pLeftExpr = pExpr;
1876	pExpr = pExprNew;
1877	rc = vdScriptParseBitwiseAndExpression(pThis, &pExprNew);
1878	if (RT_SUCCESS(rc))
1879	pExpr->BinaryOp.pRightExpr = pExprNew;
1880	}
1881	else
1882	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1883	}
1884
1885	if (RT_SUCCESS(rc))
1886	*ppAstNodeExpr = pExpr;
1887	else
1888	vdScriptAstNodeFree(&pExpr->Core);
1889	}
1890
1891	LogFlowFunc(("returns rc=%Rrc\n", rc));
1892	return rc;
1893	}
1894
1895	/**
1896	* Parse a bitwise or expression.
1897	*
1898	* @returns VBox status code.
1899	* @param pThis The script context.
1900	* @param ppAstNodeExpr Where to store the expression AST node on success.
1901	*
1902	* @note Syntax:
1903	* or-expression:
1904	* xor-expression
1905	* or-expression \| xor-expression
1906	*/
1907	static int vdScriptParseBitwiseOrExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
1908	{
1909	int rc = VINF_SUCCESS;
1910	PVDSCRIPTASTEXPR pExpr = NULL;
1911
1912	LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
1913
1914	rc = vdScriptParseBitwiseXorExpression(pThis, &pExpr);
1915	if (RT_SUCCESS(rc))
1916	{
1917	PVDSCRIPTASTEXPR pExprNew = NULL;
1918	while ( RT_SUCCESS(rc)
1919	&& vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "\|"))
1920	{
1921	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1922	if (pExprNew)
1923	{
1924	pExprNew->enmType = VDSCRIPTEXPRTYPE_BITWISE_OR;
1925	pExprNew->BinaryOp.pLeftExpr = pExpr;
1926	pExpr = pExprNew;
1927	rc = vdScriptParseBitwiseXorExpression(pThis, &pExprNew);
1928	if (RT_SUCCESS(rc))
1929	pExpr->BinaryOp.pRightExpr = pExprNew;
1930	}
1931	else
1932	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1933	}
1934
1935	if (RT_SUCCESS(rc))
1936	*ppAstNodeExpr = pExpr;
1937	else
1938	vdScriptAstNodeFree(&pExpr->Core);
1939	}
1940
1941	LogFlowFunc(("returns rc=%Rrc\n", rc));
1942	return rc;
1943	}
1944
1945	/**
1946	* Parse a logical and expression.
1947	*
1948	* @returns VBox status code.
1949	* @param pThis The script context.
1950	* @param ppAstNodeExpr Where to store the expression AST node on success.
1951	*
1952	* @note Syntax:
1953	* logical-and-expression:
1954	* or-expression
1955	* logical-and-expression \| or-expression
1956	*/
1957	static int vdScriptParseLogicalAndExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
1958	{
1959	int rc = VINF_SUCCESS;
1960	PVDSCRIPTASTEXPR pExpr = NULL;
1961
1962	LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
1963
1964	rc = vdScriptParseBitwiseOrExpression(pThis, &pExpr);
1965	if (RT_SUCCESS(rc))
1966	{
1967	PVDSCRIPTASTEXPR pExprNew = NULL;
1968	while ( RT_SUCCESS(rc)
1969	&& vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "&&"))
1970	{
1971	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
1972	if (pExprNew)
1973	{
1974	pExprNew->enmType = VDSCRIPTEXPRTYPE_LOGICAL_AND;
1975	pExprNew->BinaryOp.pLeftExpr = pExpr;
1976	pExpr = pExprNew;
1977	rc = vdScriptParseBitwiseOrExpression(pThis, &pExprNew);
1978	if (RT_SUCCESS(rc))
1979	pExpr->BinaryOp.pRightExpr = pExprNew;
1980	}
1981	else
1982	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
1983	}
1984
1985	if (RT_SUCCESS(rc))
1986	*ppAstNodeExpr = pExpr;
1987	else
1988	vdScriptAstNodeFree(&pExpr->Core);
1989	}
1990
1991	LogFlowFunc(("returns rc=%Rrc\n", rc));
1992	return rc;
1993	}
1994
1995	/**
1996	* Parse a logical or expression.
1997	*
1998	* @returns VBox status code.
1999	* @param pThis The script context.
2000	* @param ppAstNodeExpr Where to store the expression AST node on success.
2001	*
2002	* @note Syntax:
2003	* logical-or-expression:
2004	* logical-and-expression
2005	* logical-or-expression \| logical-and-expression
2006	*/
2007	static int vdScriptParseLogicalOrExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
2008	{
2009	int rc = VINF_SUCCESS;
2010	PVDSCRIPTASTEXPR pExpr = NULL;
2011
2012	LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
2013
2014	rc = vdScriptParseLogicalAndExpression(pThis, &pExpr);
2015	if (RT_SUCCESS(rc))
2016	{
2017	PVDSCRIPTASTEXPR pExprNew = NULL;
2018	while ( RT_SUCCESS(rc)
2019	&& vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "\|\|"))
2020	{
2021	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
2022	if (pExprNew)
2023	{
2024	pExprNew->enmType = VDSCRIPTEXPRTYPE_LOGICAL_OR;
2025	pExprNew->BinaryOp.pLeftExpr = pExpr;
2026	pExpr = pExprNew;
2027	rc = vdScriptParseLogicalAndExpression(pThis, &pExprNew);
2028	if (RT_SUCCESS(rc))
2029	pExpr->BinaryOp.pRightExpr = pExprNew;
2030	}
2031	else
2032	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
2033	}
2034
2035	if (RT_SUCCESS(rc))
2036	*ppAstNodeExpr = pExpr;
2037	else
2038	vdScriptAstNodeFree(&pExpr->Core);
2039	}
2040
2041	LogFlowFunc(("returns rc=%Rrc\n", rc));
2042	return rc;
2043	}
2044
2045	/**
2046	* Parse a conditional expression.
2047	*
2048	* @returns VBox status code.
2049	* @param pThis The script context.
2050	* @param ppAstNodeExpr Where to store the expression AST node on success.
2051	*
2052	* @note: VDScript doesn't support logical-or-expression ? expression : conditional-expression
2053	* so a conditional expression is equal to a logical-or-expression.
2054	*/
2055	static int vdScriptParseCondExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
2056	{
2057	return vdScriptParseLogicalOrExpression(pThis, ppAstNodeExpr);
2058	}
2059
2060	/**
2061	* Parse a constant expression.
2062	*
2063	* @returns VBox status code.
2064	* @param pThis The script context.
2065	* @param ppAstNodeExpr Where to store the expression AST node on success.
2066	*
2067	* @note Syntax:
2068	* constant-expression:
2069	* conditional-expression
2070	*/
2071	static int vdScriptParseConstExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
2072	{
2073	return vdScriptParseCondExpression(pThis, ppAstNodeExpr);
2074	}
2075
2076	/**
2077	* Parse an assignment expression.
2078	*
2079	* @returns VBox status code.
2080	* @param pThis The script context.
2081	* @param ppAstNodeExpr Where to store the expression AST node on success.
2082	*
2083	* @note Syntax:
2084	* assignment-expression:
2085	* conditional-expression
2086	* unary-expression assignment-operator assignment-expression
2087	*/
2088	static int vdScriptParseAssignmentExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
2089	{
2090	int rc = VINF_SUCCESS;
2091	PVDSCRIPTASTEXPR pExpr;
2092
2093	LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
2094
2095	rc = vdScriptParseLogicalOrExpression(pThis, &pExpr);
2096	if (RT_SUCCESS(rc))
2097	{
2098	PVDSCRIPTASTEXPR pExprNew = NULL;
2099	while (RT_SUCCESS(rc))
2100	{
2101	if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "="))
2102	{
2103	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
2104	if (pExprNew)
2105	pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN;
2106	else
2107	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
2108	}
2109	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "*="))
2110	{
2111	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
2112	if (pExprNew)
2113	pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN_MULT;
2114	else
2115	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
2116	}
2117	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "/="))
2118	{
2119	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
2120	if (pExprNew)
2121	pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN_DIV;
2122	else
2123	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
2124	}
2125	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "%="))
2126	{
2127	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
2128	if (pExprNew)
2129	pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN_MOD;
2130	else
2131	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
2132	}
2133	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "+="))
2134	{
2135	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
2136	if (pExprNew)
2137	pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN_ADD;
2138	else
2139	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
2140	}
2141	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "-="))
2142	{
2143	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
2144	if (pExprNew)
2145	pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN_SUB;
2146	else
2147	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
2148	}
2149	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "<<="))
2150	{
2151	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
2152	if (pExprNew)
2153	pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN_LSL;
2154	else
2155	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
2156	}
2157	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, ">>="))
2158	{
2159	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
2160	if (pExprNew)
2161	pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN_LSR;
2162	else
2163	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
2164	}
2165	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "&="))
2166	{
2167	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
2168	if (pExprNew)
2169	pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN_AND;
2170	else
2171	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
2172	}
2173	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "^="))
2174	{
2175	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
2176	if (pExprNew)
2177	pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN_XOR;
2178	else
2179	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
2180	}
2181	else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "\|="))
2182	{
2183	pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
2184	if (pExprNew)
2185	pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN_OR;
2186	else
2187	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
2188	}
2189	else
2190	break;
2191
2192	pExprNew->BinaryOp.pLeftExpr = pExpr;
2193	pExpr = pExprNew;
2194	rc = vdScriptParseLogicalOrExpression(pThis, &pExprNew);
2195	if (RT_SUCCESS(rc))
2196	pExpr->BinaryOp.pRightExpr = pExprNew;
2197	}
2198
2199	if (RT_SUCCESS(rc))
2200	*ppAstNodeExpr = pExpr;
2201	else
2202	vdScriptAstNodeFree(&pExpr->Core);
2203	}
2204
2205	LogFlowFunc(("returns rc=%Rrc\n", rc));
2206	return rc;
2207	}
2208
2209	/**
2210	* Parse an expression.
2211	*
2212	* @returns VBox status code.
2213	* @param pThis The script context.
2214	* @param ppAstNodeExpr Where to store the expression AST node on success.
2215	*
2216	* @note Syntax:
2217	* expression:
2218	* assignment-expression
2219	* expression , assignment-expression
2220	*/
2221	static int vdScriptParseExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
2222	{
2223	int rc = VINF_SUCCESS;
2224	PVDSCRIPTASTEXPR pAssignExpr = NULL;
2225
2226	LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
2227
2228	rc = vdScriptParseAssignmentExpression(pThis, &pAssignExpr);
2229	if ( RT_SUCCESS(rc)
2230	&& vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ','))
2231	{
2232	PVDSCRIPTASTEXPR pListAssignExpr = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
2233	if (pListAssignExpr)
2234	{
2235	pListAssignExpr->enmType = VDSCRIPTEXPRTYPE_ASSIGNMENT_LIST;
2236	RTListInit(&pListAssignExpr->ListExpr);
2237	RTListAppend(&pListAssignExpr->ListExpr, &pAssignExpr->Core.ListNode);
2238	do
2239	{
2240	rc = vdScriptParseAssignmentExpression(pThis, &pAssignExpr);
2241	if (RT_SUCCESS(rc))
2242	RTListAppend(&pListAssignExpr->ListExpr, &pAssignExpr->Core.ListNode);
2243	} while ( RT_SUCCESS(rc)
2244	&& vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ','));
2245
2246	if (RT_FAILURE(rc))
2247	vdScriptAstNodeFree(&pListAssignExpr->Core);
2248	else
2249	*ppAstNodeExpr = pListAssignExpr;
2250	}
2251	else
2252	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
2253	}
2254	else if (RT_SUCCESS(rc))
2255	*ppAstNodeExpr = pAssignExpr;
2256
2257	LogFlowFunc(("returns rc=%Rrc\n", rc));
2258	return rc;
2259	}
2260
2261	/**
2262	* Parse an if statement.
2263	*
2264	* @returns VBox status code.
2265	* @param pThis The script context.
2266	* @param pAstNodeIf Uninitialized if AST node.
2267	*
2268	* @note The caller skipped the "if" token already.
2269	*/
2270	static int vdScriptParseIf(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTIF pAstNodeIf)
2271	{
2272	int rc = VINF_SUCCESS;
2273
2274	if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '('))
2275	{
2276	PVDSCRIPTASTEXPR pCondExpr = NULL;
2277	rc = vdScriptParseExpression(pThis, &pCondExpr);
2278	if (RT_SUCCESS(rc))
2279	{
2280	if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ')'))
2281	{
2282	PVDSCRIPTASTSTMT pStmt = NULL;
2283	PVDSCRIPTASTSTMT pElseStmt = NULL;
2284	rc = vdScriptParseStatement(pThis, &pStmt);
2285	if ( RT_SUCCESS(rc)
2286	&& vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_ELSE))
2287	rc = vdScriptParseStatement(pThis, &pElseStmt);
2288
2289	if (RT_SUCCESS(rc))
2290	{
2291	pAstNodeIf->pCond = pCondExpr;
2292	pAstNodeIf->pTrueStmt = pStmt;
2293	pAstNodeIf->pElseStmt = pElseStmt;
2294	}
2295	else if (pStmt)
2296	vdScriptAstNodeFree(&pStmt->Core);
2297	}
2298	else
2299	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \")\", got ...\n");
2300
2301	if (RT_FAILURE(rc))
2302	vdScriptAstNodeFree(&pCondExpr->Core);
2303	}
2304	}
2305	else
2306	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \"(\", got ...\n");
2307
2308	return rc;
2309	}
2310
2311	/**
2312	* Parse a switch statement.
2313	*
2314	* @returns VBox status code.
2315	* @param pThis The script context.
2316	* @param pAstNodeSwitch Uninitialized switch AST node.
2317	*
2318	* @note The caller skipped the "switch" token already.
2319	*/
2320	static int vdScriptParseSwitch(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTSWITCH pAstNodeSwitch)
2321	{
2322	int rc = VINF_SUCCESS;
2323
2324	if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '('))
2325	{
2326	PVDSCRIPTASTEXPR pExpr = NULL;
2327
2328	rc = vdScriptParseExpression(pThis, &pExpr);
2329	if ( RT_SUCCESS(rc)
2330	&& vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ')'))
2331	{
2332	PVDSCRIPTASTSTMT pStmt = NULL;
2333	rc = vdScriptParseStatement(pThis, &pStmt);
2334	if (RT_SUCCESS(rc))
2335	{
2336	pAstNodeSwitch->pCond = pExpr;
2337	pAstNodeSwitch->pStmt = pStmt;
2338	}
2339	else
2340	vdScriptAstNodeFree(&pExpr->Core);
2341	}
2342	else if (RT_SUCCESS(rc))
2343	{
2344	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \")\", got ...\n");
2345	vdScriptAstNodeFree(&pExpr->Core);
2346	}
2347	}
2348	else
2349	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \"(\", got ...\n");
2350
2351	return rc;
2352	}
2353
2354	/**
2355	* Parse a while or do ... while statement.
2356	*
2357	* @returns VBox status code.
2358	* @param pThis The script context.
2359	* @param pAstNodeWhile Uninitialized while AST node.
2360	*
2361	* @note The caller skipped the "while" or "do" token already.
2362	*/
2363	static int vdScriptParseWhile(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTWHILE pAstNodeWhile, bool fDoWhile)
2364	{
2365	int rc = VINF_SUCCESS;
2366
2367	pAstNodeWhile->fDoWhile = fDoWhile;
2368
2369	if (fDoWhile)
2370	{
2371	PVDSCRIPTASTSTMT pStmt = NULL;
2372	rc = vdScriptParseStatement(pThis, &pStmt);
2373	if ( RT_SUCCESS(rc)
2374	&& vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_WHILE))
2375	{
2376	if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '('))
2377	{
2378	PVDSCRIPTASTEXPR pExpr = NULL;
2379
2380	rc = vdScriptParseExpression(pThis, &pExpr);
2381	if ( RT_SUCCESS(rc)
2382	&& vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ')'))
2383	{
2384	if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ';'))
2385	{
2386	pAstNodeWhile->pCond = pExpr;
2387	pAstNodeWhile->pStmt = pStmt;
2388	}
2389	else
2390	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \";\", got ...\n");
2391	}
2392	else if (RT_SUCCESS(rc))
2393	{
2394	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \")\", got ...\n");
2395	vdScriptAstNodeFree(&pExpr->Core);
2396	}
2397	}
2398	else
2399	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \"(\", got ...\n");
2400	}
2401	else if (RT_SUCCESS(rc))
2402	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \"while\", got ...\n");
2403
2404	if ( RT_FAILURE(rc)
2405	&& pStmt)
2406	vdScriptAstNodeFree(&pStmt->Core);
2407	}
2408	else
2409	{
2410	if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '('))
2411	{
2412	PVDSCRIPTASTEXPR pExpr = NULL;
2413
2414	rc = vdScriptParseExpression(pThis, &pExpr);
2415	if ( RT_SUCCESS(rc)
2416	&& vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ')'))
2417	{
2418	PVDSCRIPTASTSTMT pStmt = NULL;
2419	rc = vdScriptParseStatement(pThis, &pStmt);
2420	if (RT_SUCCESS(rc))
2421	{
2422	pAstNodeWhile->pCond = pExpr;
2423	pAstNodeWhile->pStmt = pStmt;
2424	}
2425	else
2426	vdScriptAstNodeFree(&pExpr->Core);
2427	}
2428	else if (RT_SUCCESS(rc))
2429	{
2430	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \")\", got ...\n");
2431	vdScriptAstNodeFree(&pExpr->Core);
2432	}
2433	}
2434	else
2435	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \"(\", got ...\n");
2436	}
2437
2438	return rc;
2439	}
2440
2441	/**
2442	* Parse a for statement.
2443	*
2444	* @returns VBox status code.
2445	* @param pThis The script context.
2446	* @param pAstNodeFor Uninitialized for AST node.
2447	*
2448	* @note The caller skipped the "for" token already.
2449	*/
2450	static int vdScriptParseFor(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTFOR pAstNodeFor)
2451	{
2452	int rc = VINF_SUCCESS;
2453
2454	if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '('))
2455	{
2456	PVDSCRIPTASTEXPR pExprStart = NULL;
2457	PVDSCRIPTASTEXPR pExprCond = NULL;
2458	PVDSCRIPTASTEXPR pExpr3 = NULL;
2459
2460	rc = vdScriptParseExpression(pThis, &pExprStart);
2461	if ( RT_SUCCESS(rc)
2462	&& vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ';'))
2463	{
2464	rc = vdScriptParseExpression(pThis, &pExprCond);
2465	if ( RT_SUCCESS(rc)
2466	&& vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ';'))
2467	{
2468	rc = vdScriptParseExpression(pThis, &pExpr3);
2469	if ( RT_SUCCESS(rc)
2470	&& vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ')'))
2471	{
2472	PVDSCRIPTASTSTMT pStmt = NULL;
2473	rc = vdScriptParseStatement(pThis, &pStmt);
2474	if (RT_SUCCESS(rc))
2475	{
2476	pAstNodeFor->pExprStart = pExprStart;
2477	pAstNodeFor->pExprCond = pExprCond;
2478	pAstNodeFor->pExpr3 = pExpr3;
2479	pAstNodeFor->pStmt = pStmt;
2480	}
2481	}
2482	}
2483	else if (RT_SUCCESS(rc))
2484	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \";\", got ...\n");
2485	}
2486	else if (RT_SUCCESS(rc))
2487	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \";\", got ...\n");
2488
2489	if (RT_FAILURE(rc))
2490	{
2491	if (pExprStart)
2492	vdScriptAstNodeFree(&pExprStart->Core);
2493	if (pExprCond)
2494	vdScriptAstNodeFree(&pExprCond->Core);
2495	if (pExpr3)
2496	vdScriptAstNodeFree(&pExpr3->Core);
2497	}
2498	}
2499	else
2500	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \"(\", got ...\n");
2501
2502	return rc;
2503	}
2504
2505	/**
2506	* Parse a declaration.
2507	*
2508	* @returns VBox status code.
2509	* @param pThis The script context.
2510	* @param ppAstNodeDecl Where to store the declaration AST node on success.
2511	*/
2512	static int vdScriptParseDeclaration(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTDECL *ppAstNodeDecl)
2513	{
2514	int rc = VERR_NOT_IMPLEMENTED;
2515	return rc;
2516	}
2517
2518	/**
2519	* Parse a statement.
2520	*
2521	* @returns VBox status code.
2522	* @param pThis The script context.
2523	* @param ppAstNodeStmt Where to store the statement AST node on success.
2524	*/
2525	static int vdScriptParseStatement(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTSTMT *ppAstNodeStmt)
2526	{
2527	int rc = VINF_SUCCESS;
2528
2529	/* Shortcut for a new compound statement. */
2530	if (vdScriptTokenizerIsPunctuatorEqual(pThis->pTokenizer, '{'))
2531	rc = vdScriptParseCompoundStatement(pThis, ppAstNodeStmt);
2532	else
2533	{
2534	PVDSCRIPTASTSTMT pAstNodeStmt = (PVDSCRIPTASTSTMT)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_STATEMENT);
2535
2536	if (pAstNodeStmt)
2537	{
2538
2539	if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_DEFAULT))
2540	{
2541	if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ':'))
2542	{
2543	PVDSCRIPTASTSTMT pAstNodeStmtDef = NULL;
2544	pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_DEFAULT;
2545	rc = vdScriptParseStatement(pThis, &pAstNodeStmtDef);
2546	if (RT_SUCCESS(rc))
2547	pAstNodeStmt->pStmt = pAstNodeStmtDef;
2548	}
2549	else
2550	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \":\", got ...\n");
2551	}
2552	else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_CASE))
2553	{
2554	PVDSCRIPTASTEXPR pAstNodeExpr = NULL;
2555	rc = vdScriptParseCondExpression(pThis, &pAstNodeExpr);
2556	if (RT_SUCCESS(rc))
2557	{
2558	if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ':'))
2559	{
2560	PVDSCRIPTASTSTMT pAstNodeCaseStmt = NULL;
2561	rc = vdScriptParseStatement(pThis, &pAstNodeCaseStmt);
2562	if (RT_SUCCESS(rc))
2563	{
2564	pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_CASE;
2565	pAstNodeStmt->Case.pExpr = pAstNodeExpr;
2566	pAstNodeStmt->Case.pStmt = pAstNodeCaseStmt;
2567	}
2568	}
2569	else
2570	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \":\", got ...\n");
2571
2572	if (RT_FAILURE(rc))
2573	vdScriptAstNodeFree(&pAstNodeExpr->Core);
2574	}
2575	}
2576	else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_IF))
2577	{
2578	pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_IF;
2579	rc = vdScriptParseIf(pThis, &pAstNodeStmt->If);
2580	}
2581	else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_SWITCH))
2582	{
2583	pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_SWITCH;
2584	rc = vdScriptParseSwitch(pThis, &pAstNodeStmt->Switch);
2585	}
2586	else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_WHILE))
2587	{
2588	pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_WHILE;
2589	rc = vdScriptParseWhile(pThis, &pAstNodeStmt->While, false /* fDoWhile */);
2590	}
2591	else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_DO))
2592	{
2593	pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_WHILE;
2594	rc = vdScriptParseWhile(pThis, &pAstNodeStmt->While, true /* fDoWhile */);
2595	}
2596	else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_FOR))
2597	{
2598	pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_FOR;
2599	rc = vdScriptParseFor(pThis, &pAstNodeStmt->For);
2600	}
2601	else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_CONTINUE))
2602	{
2603	pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_CONTINUE;
2604	if (!vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ';'))
2605	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \";\", got ...\n");
2606	}
2607	else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_BREAK))
2608	{
2609	pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_BREAK;
2610	if (!vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ';'))
2611	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \";\", got ...\n");
2612	}
2613	else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_RETURN))
2614	{
2615	pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_RETURN;
2616	if (!vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ';'))
2617	{
2618	rc = vdScriptParseExpression(pThis, &pAstNodeStmt->pExpr);
2619	if ( RT_SUCCESS(rc)
2620	&& !vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ';'))
2621	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \";\", got ...\n");
2622	}
2623	else
2624	pAstNodeStmt->pExpr = NULL; /* No expression for return. */
2625	}
2626	else
2627	{
2628	/* Must be an expression. */
2629	pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_EXPRESSION;
2630	rc = vdScriptParseExpression(pThis, &pAstNodeStmt->pExpr);
2631	if ( RT_SUCCESS(rc)
2632	&& !vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ';'))
2633	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \";\", got ...\n");
2634	}
2635
2636	if (RT_SUCCESS(rc))
2637	*ppAstNodeStmt = pAstNodeStmt;
2638	else
2639	vdScriptAstNodeFree(&pAstNodeStmt->Core);
2640	}
2641	else
2642	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory creating statement node\n");
2643	}
2644
2645	return rc;
2646	}
2647
2648	/**
2649	* Parses a compound statement.
2650	*
2651	* @returns VBox status code.
2652	* @param pThis The script context.
2653	* @param ppAstNodeCompound Where to store the compound AST node on success.
2654	*/
2655	static int vdScriptParseCompoundStatement(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTSTMT *ppAstNodeCompound)
2656	{
2657	int rc = VINF_SUCCESS;
2658
2659	if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '{'))
2660	{
2661	PVDSCRIPTASTSTMT pAstNodeCompound = (PVDSCRIPTASTSTMT)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_STATEMENT);
2662	if (pAstNodeCompound)
2663	{
2664	pAstNodeCompound->enmStmtType = VDSCRIPTSTMTTYPE_COMPOUND;
2665	RTListInit(&pAstNodeCompound->Compound.ListDecls);
2666	RTListInit(&pAstNodeCompound->Compound.ListStmts);
2667	while (!vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '}'))
2668	{
2669	/*
2670	* Check whether we have a declaration or a statement.
2671	* For now we assume that 2 identifier tokens specify a declaration
2672	* (type + variable name). Having two consecutive identifers is not possible
2673	* for a statement.
2674	*/
2675	if ( vdScriptTokenizerGetTokenClass(pThis->pTokenizer) == VDTOKENCLASS_IDENTIFIER
2676	&& vdScriptTokenizerPeekNextClass(pThis->pTokenizer) == VDTOKENCLASS_IDENTIFIER)
2677	{
2678	PVDSCRIPTASTDECL pAstNodeDecl = NULL;
2679	rc = vdScriptParseDeclaration(pThis, &pAstNodeDecl);
2680	if (RT_SUCCESS(rc))
2681	RTListAppend(&pAstNodeCompound->Compound.ListDecls, &pAstNodeDecl->Core.ListNode);
2682	}
2683	else
2684	{
2685	PVDSCRIPTASTSTMT pAstNodeStmt = NULL;
2686	rc = vdScriptParseStatement(pThis, &pAstNodeStmt);
2687	if (RT_SUCCESS(rc))
2688	RTListAppend(&pAstNodeCompound->Compound.ListStmts, &pAstNodeStmt->Core.ListNode);
2689	}
2690
2691	if (RT_FAILURE(rc))
2692	break;
2693	}
2694
2695	if (RT_SUCCESS(rc))
2696	*ppAstNodeCompound = pAstNodeCompound;
2697	else
2698	vdScriptAstNodeFree(&pAstNodeCompound->Core);
2699	}
2700	else
2701	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory creating compound statement node\n");
2702	}
2703	else
2704	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \"{\" got...\n");
2705
2706
2707	return rc;
2708	}
2709
2710	/**
2711	* Parses a function definition from the given tokenizer.
2712	*
2713	* @returns VBox status code.
2714	* @param pThis The script context.
2715	*/
2716	static int vdScriptParseAddFnDef(PVDSCRIPTCTXINT pThis)
2717	{
2718	int rc = VINF_SUCCESS;
2719	PVDSCRIPTASTIDE pRetType = NULL;
2720	PVDSCRIPTASTIDE pFnIde = NULL;
2721
2722	LogFlowFunc(("pThis=%p\n", pThis));
2723
2724	/* Put return type on the stack. */
2725	rc = vdScriptParseIde(pThis, &pRetType);
2726	if (RT_SUCCESS(rc))
2727	{
2728	/* Function name */
2729	rc = vdScriptParseIde(pThis, &pFnIde);
2730	if (RT_SUCCESS(rc))
2731	{
2732	if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '('))
2733	{
2734	PVDSCRIPTASTFN pAstNodeFn = (PVDSCRIPTASTFN)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_FUNCTION);
2735
2736	if (pAstNodeFn)
2737	{
2738	pAstNodeFn->pFnIde = pFnIde;
2739	pAstNodeFn->pRetType = pRetType;
2740	RTListInit(&pAstNodeFn->ListArgs);
2741
2742	pFnIde = NULL;
2743	pRetType = NULL;
2744
2745	/* Parse parameter list, create empty parameter list AST node and put it on the stack. */
2746	while (!vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ')'))
2747	{
2748	PVDSCRIPTASTIDE pArgType = NULL;
2749	PVDSCRIPTASTIDE pArgIde = NULL;
2750	/* Parse two identifiers, first one is the type, second the name. */
2751	rc = vdScriptParseIde(pThis, &pArgType);
2752	if (RT_SUCCESS(rc))
2753	rc = vdScriptParseIde(pThis, &pArgIde);
2754
2755	if (RT_SUCCESS(rc))
2756	{
2757	PVDSCRIPTASTFNARG pAstNodeFnArg = (PVDSCRIPTASTFNARG)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_FUNCTIONARG);
2758	if (pAstNodeFnArg)
2759	{
2760	pAstNodeFnArg->pArgIde = pArgIde;
2761	pAstNodeFnArg->pType = pArgType;
2762	RTListAppend(&pAstNodeFn->ListArgs, &pAstNodeFnArg->Core.ListNode);
2763	pAstNodeFn->cArgs++;
2764	}
2765	else
2766	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating function argument AST node\n");
2767	}
2768
2769	if (RT_FAILURE(rc))
2770	{
2771	if (pArgType)
2772	vdScriptAstNodeFree(&pArgType->Core);
2773	if (pArgIde)
2774	vdScriptAstNodeFree(&pArgIde->Core);
2775	}
2776
2777	if ( !vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ',')
2778	&& !vdScriptTokenizerIsPunctuatorEqual(pThis->pTokenizer, ')'))
2779	{
2780	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \",\" or \")\" got...\n");
2781	break;
2782	}
2783	}
2784
2785	/* Parse the compound or statement block now. */
2786	if (RT_SUCCESS(rc))
2787	{
2788	PVDSCRIPTASTSTMT pAstCompound = NULL;
2789
2790	rc = vdScriptParseCompoundStatement(pThis, &pAstCompound);
2791	if (RT_SUCCESS(rc))
2792	{
2793	/*
2794	* Link compound statement block to function AST node and add it to the
2795	* list of functions.
2796	*/
2797	pAstNodeFn->pCompoundStmts = pAstCompound;
2798	RTListAppend(&pThis->ListAst, &pAstNodeFn->Core.ListNode);
2799
2800	PVDSCRIPTFN pFn = (PVDSCRIPTFN)RTMemAllocZ(sizeof(VDSCRIPTFN));
2801	if (pFn)
2802	{
2803	pFn->Core.pszString = pAstNodeFn->pFnIde->aszIde;
2804	pFn->Core.cchString = strlen(pFn->Core.pszString);
2805	pFn->fExternal = false;
2806	pFn->Type.Internal.pAstFn = pAstNodeFn;
2807	/** @todo: Parameters. */
2808	RTStrSpaceInsert(&pThis->hStrSpaceFn, &pFn->Core);
2809	}
2810	else
2811	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory allocating memory for function\n");
2812	}
2813	}
2814
2815	if (RT_FAILURE(rc))
2816	vdScriptAstNodeFree(&pAstNodeFn->Core);
2817	}
2818	else
2819	rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating function AST node\n");
2820	}
2821	else
2822	rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \"(\" got...\n");
2823	}
2824	}
2825
2826	if (RT_FAILURE(rc))
2827	{
2828	if (pRetType)
2829	vdScriptAstNodeFree(&pRetType->Core);
2830	if (pFnIde)
2831	vdScriptAstNodeFree(&pFnIde->Core);
2832	}
2833
2834	LogFlowFunc(("returns rc=%Rrc\n", rc));
2835	return rc;
2836	}
2837
2838	/**
2839	* Parses the script from the given tokenizer.
2840	*
2841	* @returns VBox status code.
2842	* @param pThis The script context.
2843	*/
2844	static int vdScriptParseFromTokenizer(PVDSCRIPTCTXINT pThis)
2845	{
2846	int rc = VINF_SUCCESS;
2847
2848	LogFlowFunc(("pThis=%p\n", pThis));
2849
2850	/* This is a very very simple LL(1) parser, don't expect much from it for now :). */
2851	while ( RT_SUCCESS(rc)
2852	&& !vdScriptTokenizerIsEos(pThis->pTokenizer))
2853	rc = vdScriptParseAddFnDef(pThis);
2854
2855	LogFlowFunc(("returns rc=%Rrc\n", rc));
2856	return rc;
2857	}
2858
2859	DECLHIDDEN(int) VDScriptCtxCreate(PVDSCRIPTCTX phScriptCtx)
2860	{
2861	int rc = VINF_SUCCESS;
2862
2863	LogFlowFunc(("phScriptCtx=%p\n", phScriptCtx));
2864
2865	AssertPtrReturn(phScriptCtx, VERR_INVALID_POINTER);
2866
2867	PVDSCRIPTCTXINT pThis = (PVDSCRIPTCTXINT)RTMemAllocZ(sizeof(VDSCRIPTCTXINT));
2868	if (pThis)
2869	{
2870	pThis->hStrSpaceFn = NULL;
2871	RTListInit(&pThis->ListAst);
2872	*phScriptCtx = pThis;
2873	}
2874	else
2875	rc = VINF_SUCCESS;
2876
2877	LogFlowFunc(("returns rc=%Rrc\n", rc));
2878	return rc;
2879	}
2880
2881	static int vdScriptCtxDestroyFnSpace(PRTSTRSPACECORE pStr, void *pvUser)
2882	{
2883	NOREF(pvUser);
2884
2885	/*
2886	* Just free the whole structure, the AST for internal functions will be
2887	* destroyed later.
2888	*/
2889	RTMemFree(pStr);
2890	return VINF_SUCCESS;
2891	}
2892
2893	DECLHIDDEN(void) VDScriptCtxDestroy(VDSCRIPTCTX hScriptCtx)
2894	{
2895	PVDSCRIPTCTXINT pThis = hScriptCtx;
2896
2897	AssertPtrReturnVoid(pThis);
2898
2899	LogFlowFunc(("hScriptCtx=%p\n", pThis));
2900
2901	RTStrSpaceDestroy(&pThis->hStrSpaceFn, vdScriptCtxDestroyFnSpace, NULL);
2902
2903	/* Go through list of function ASTs and destroy them. */
2904	PVDSCRIPTASTCORE pIter;
2905	PVDSCRIPTASTCORE pIterNext;
2906	RTListForEachSafe(&pThis->ListAst, pIter, pIterNext, VDSCRIPTASTCORE, ListNode)
2907	{
2908	RTListNodeRemove(&pIter->ListNode);
2909	RTListInit(&pIter->ListNode);
2910	vdScriptAstNodeFree(pIter);
2911	}
2912
2913	RTMemFree(pThis);
2914	}
2915
2916	DECLHIDDEN(int) VDScriptCtxCallbacksRegister(VDSCRIPTCTX hScriptCtx, PCVDSCRIPTCALLBACK paCallbacks,
2917	unsigned cCallbacks, void *pvUser)
2918	{
2919	int rc = VINF_SUCCESS;
2920	PVDSCRIPTCTXINT pThis = hScriptCtx;
2921
2922	LogFlowFunc(("hScriptCtx=%p paCallbacks=%p cCallbacks=%u pvUser=%p\n",
2923	pThis, paCallbacks, cCallbacks, pvUser));
2924
2925	AssertPtrReturn(pThis, VERR_INVALID_POINTER);
2926	AssertPtrReturn(paCallbacks, VERR_INVALID_POINTER);
2927	AssertReturn(cCallbacks > 0, VERR_INVALID_PARAMETER);
2928
2929	/** @todo: Unregister already registered callbacks in case of an error. */
2930	do
2931	{
2932	PVDSCRIPTFN pFn = NULL;
2933
2934	if (RTStrSpaceGet(&pThis->hStrSpaceFn, paCallbacks->pszFnName))
2935	{
2936	rc = VERR_DUPLICATE;
2937	break;
2938	}
2939
2940	pFn = (PVDSCRIPTFN)RTMemAllocZ(RT_OFFSETOF(VDSCRIPTFN, aenmArgTypes[paCallbacks->cArgs]));
2941	if (!pFn)
2942	{
2943	rc = VERR_NO_MEMORY;
2944	break;
2945	}
2946
2947	/** @todo: Validate argument and returns types. */
2948	pFn->Core.pszString = paCallbacks->pszFnName;
2949	pFn->Core.cchString = strlen(pFn->Core.pszString);
2950	pFn->fExternal = true;
2951	pFn->Type.External.pfnCallback = paCallbacks->pfnCallback;
2952	pFn->Type.External.pvUser = pvUser;
2953	pFn->enmTypeRetn = paCallbacks->enmTypeReturn;
2954	pFn->cArgs = paCallbacks->cArgs;
2955
2956	for (unsigned i = 0; i < paCallbacks->cArgs; i++)
2957	pFn->aenmArgTypes[i] = paCallbacks->paArgs[i];
2958
2959	RTStrSpaceInsert(&pThis->hStrSpaceFn, &pFn->Core);
2960	cCallbacks--;
2961	paCallbacks++;
2962	}
2963	while (cCallbacks);
2964
2965	LogFlowFunc(("returns rc=%Rrc\n", rc));
2966	return rc;
2967	}
2968
2969	DECLHIDDEN(int) VDScriptCtxLoadScript(VDSCRIPTCTX hScriptCtx, const char *pszScript)
2970	{
2971	int rc = VINF_SUCCESS;
2972	PVDSCRIPTCTXINT pThis = hScriptCtx;
2973
2974	LogFlowFunc(("hScriptCtx=%p pszScript=%p\n", pThis, pszScript));
2975
2976	AssertPtrReturn(pThis, VERR_INVALID_POINTER);
2977	AssertPtrReturn(pszScript, VERR_INVALID_POINTER);
2978
2979	PVDTOKENIZER pTokenizer = vdScriptTokenizerCreate(pszScript);
2980	if (pTokenizer)
2981	{
2982	pThis->pTokenizer = pTokenizer;
2983	rc = vdScriptParseFromTokenizer(pThis);
2984	pThis->pTokenizer = NULL;
2985	RTMemFree(pTokenizer);
2986	}
2987
2988	LogFlowFunc(("returns rc=%Rrc\n", rc));
2989	return rc;
2990	}
2991
2992	DECLHIDDEN(int) VDScriptCtxCallFn(VDSCRIPTCTX hScriptCtx, const char *pszFnCall,
2993	PVDSCRIPTARG paArgs, unsigned cArgs)
2994	{
2995	PVDSCRIPTCTXINT pThis = hScriptCtx;
2996	VDSCRIPTARG Ret;
2997	return vdScriptCtxInterprete(pThis, pszFnCall, paArgs, cArgs, &Ret);
2998	}

Note: See TracBrowser for help on using the repository browser.

source: vbox/trunk/src/VBox/Storage/testcase/VDScript.cpp@ 53654

Download in other formats: