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source: branches/HeuristicLab.Problems.GPDL/SyntaxAnalyzer/GPDefSyntaxAnalyzerLex.cs @ 9573

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Last change on this file since 9573 was 9430, checked in by gkronber, 12 years ago
initial import of GPDL parser plugin
File size: 13.8 KB

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1	// GPDefSyntaxAnalyzerLex.cs HDO, 2006-08-28
2	// -------------
3	// Lexical analyzer (finite-state machine interpreter).
4	// Generated by Coco-2 (SG).
5	//=====================================\|========================================
6
7	#undef TEST_Lex
8
9	using System;
10	using System.Collections;
11	using System.Collections.Specialized;
12	using System.IO;
13	using System.Text;
14
15	public class GPDefSyntaxAnalyzerLex {
16
17	public const String MODULENAME = "GPDefSyntaxAnalyzerLex";
18	public const int EOFSPIX = 1;
19
20	public static TextReader src;
21
22	// --- token information ---
23	public static int token; // current token
24	public static int tokenLine, tokenCol; // position of current token
25	public static String tokenStr; // token string recognized
26
27	// --- current char. info, for "power users" only ---
28	public static char curCh; // current input character
29	public static int curLine, curCol; // position of curCh
30
31
32	public static void GPDefSyntaxAnalyzerLexMethod(Utils.ModuleAction action, out String moduleName) {
33	//-----------------------------------\|----------------------------------------
34	moduleName = MODULENAME;
35	switch (action) {
36	case Utils.ModuleAction.getModuleName:
37	return;
38	case Utils.ModuleAction.initModule:
39	caseSensitive = true;
40	lt = new LexicalTable();
41	tokenStrArr = new char[256];
42	kwHt = CreateHashtable();
43	nHt = CreateHashtable();
44	nl = new ArrayList();
45	break;
46	case Utils.ModuleAction.resetModule:
47	kwHt.Clear();
48	nHt.Clear();
49	nl.Clear();
50	break;
51	case Utils.ModuleAction.cleanupModule:
52	lt = null;
53	tokenStrArr = null;
54	kwHt = null;
55	nHt = null;
56	nl = null;
57	break;
58	} // switch
59	} // GPDefSyntaxAnalyzerLexMethod
60
61	private static Hashtable CreateHashtable() {
62	if (caseSensitive)
63	return new Hashtable();
64	else
65	return CollectionsUtil.CreateCaseInsensitiveHashtable();
66	} // CreateHashtable
67
68
69	public static void InitLex() {
70	//-----------------------------------\|----------------------------------------
71	// --- initialize keyword hash table ---
72	kwHt.Clear();
73	EnterKeyword( 1, "PROBLEM");
74	EnterKeyword( 2, "END");
75	EnterKeyword( 3, "EPS");
76	EnterKeyword( 4, "LOCAL");
77	EnterKeyword( 5, "NONTERMINALS");
78	EnterKeyword( 6, "RULES");
79	EnterKeyword( 7, "SEM");
80	EnterKeyword( 8, "MAXIMIZE");
81	EnterKeyword( 9, "MINIMIZE");
82	EnterKeyword( 10, "TERMINALS");
83	EnterKeyword( 11, "CONSTRAINTS");
84	EnterKeyword( 12, "INIT");
85	EnterKeyword( 13, "CODE");
86	EnterKeyword( 14, "IN");
87	EnterKeyword( 15, "SET");
88	EnterKeyword( 16, "RANGE");
89	// --- initialize name data structures ---
90	nHt.Clear();
91	nl.Clear();
92	nl.Add(""); // so spix = 0 is the empty string
93	nl.Add("!EOF!"); // so EOFSPIX = 1
94	// --- (re)set global data ---
95	curLineStr = "";
96	curCh = ' ';
97	curLine = 0;
98	curCol = 2;
99	tokenStr = null;
100	token = 0;
101	tokenCol = 0;
102	tokenLine = 0;
103	tokenStrLen = 0;
104	pendingEOLs = 0;
105	apxLen = pendingEOLs; // to prevent warning
106	} // InitLex
107
108	private static void EnterKeyword(int token, String keyword) {
109	kwHt.Add(keyword, token);
110	} // EnterKeyword
111
112
113	// * start of global LEX declarations from ATG *
114
115	// * end of global LEX declarations from ATG *
116
117
118	public static bool caseSensitive;
119
120	private class LexicalTable {
121	public int header = 4;
122	public int[] startTab = {
123	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
124	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
125	0, 0, 0, 0, 0, 0, 0, 0, 4, 5, 0, 0, 0, 0, 17, 0,
126	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 14, 2, 10, 0,
127	0, 16, 16, 16, 16, 16, 13, 16, 13, 16, 13, 13, 16, 16, 16, 16,
128	16, 13, 16, 16, 16, 16, 13, 13, 16, 13, 16, 6, 0, 7, 0, 0,
129	0, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
130	13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 8, 3, 9, 0, 0,
131	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
132	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
133	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
134	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
135	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
136	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
137	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
138	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
139	};
140	public Sets.Set256 ignoredChars = new Sets.Set256(
141	0x0600, 0x0000, 0x0001
142	);
143	public Sets.Set256 commentStart = new Sets.Set256(
144	0x0000, 0x0000, 0x8000
145	);
146	public Sets.Set256[] cls = {
147	new Sets.Set256( 0x0000, 0x0000, 0x0000, 0x0000, 0xfffe, 0x07ff, 0xfffe, 0x07ff),
148	new Sets.Set256( 0x0000, 0x0000, 0x0000, 0x03ff),
149	new Sets.Set256( 0x0000, 0x0000, 0x0000, 0x0000, 0xf2be, 0x053d),
150	new Sets.Set256( 0x0000, 0x0000, 0x0000, 0x0000, 0x0d40, 0x02c2, 0xfffe, 0x07ff)
151	};
152	} // LexicalTable
153
154	private static LexicalTable lt;
155	private static Hashtable kwHt; // hash table for keywords: string -> token
156	private static Hashtable nHt; // hash table for names: string -> null
157	private static ArrayList nl; // name list for names, index is spix
158
159	private static String curLineStr; // current source line
160	private static char[] tokenStrArr; // token string in an array
161	private static int tokenStrLen; // length of token string in tokenStrArr
162	private static int state; // current automaton state
163	private static int apxLen; // length of appendix in token string
164	private static int pendingEOLs; // nr of EOLs found in comment
165
166	// --- to save and restore scanner state ---
167	private static char savedCh;
168	private static int savedCol, savedLine;
169
170	private static void SaveScannerState() {
171	savedCh = curCh;
172	savedCol = curCol;
173	savedLine = curLine;
174	} // SaveScannerState
175
176	private static void RestoreScannerState() {
177	tokenStrLen -= apxLen;
178	apxLen = 0;
179	curCh = savedCh;
180	curCol = savedCol;
181	curLine = savedLine;
182	} // RestoreScannerState
183
184
185	public static void NextCh() {
186	//-----------------------------------\|----------------------------------------
187	for (;;) {
188
189	if (curCol < curLineStr.Length) { // within line
190	curCol++;
191	curCh = curLineStr[curCol - 1];
192	return;
193	} else if (curCol == curLineStr.Length) { // end of line
194	curCol++;
195	curCh = Utils.LF; // to separate lines
196	return;
197	} else { // curCol > curLineStr.Length
198	curLineStr = src.ReadLine();
199	curLine++;
200	curCol = 0;
201	if (curLineStr == null) { // end of file
202	curLineStr = "";
203	curCh = Utils.EF;
204	return;
205	} // if
206	} // else
207	} // for
208	} // NextCh
209
210
211	private static void CommentErr() {
212	Errors.LexError(curLine, curCol, "end of file in comment");
213	} // CommentErr
214
215	private static bool Comment() {
216
217	int level = 1;
218
219	SaveScannerState();
220	// --- from '/' '' to '' '/' nested ---
221	NextCh();
222	if (curCh == '*') {
223	NextCh();
224	for (;;)
225	switch (curCh) {
226	case '*':
227	NextCh();
228	if (curCh == '/') {
229	NextCh();
230	level--;
231	if (level == 0) {
232	return true;
233	} // if
234	} // if
235	break;
236	case '/':
237	NextCh();
238	if (curCh == '*') {
239	level++;
240	NextCh();
241	}
242	break;
243	case Utils.EF:
244	CommentErr();
245	return true;
246	default:
247	NextCh();
248	break;
249	} // switch
250	} else
251	RestoreScannerState();
252	return false;
253	} // Comment
254
255	private static void HandleLexErr() {
256	Errors.LexError(curLine, curCol,
257	"invalid character '{0}' (hex {1:X})", curCh, (int)curCh);
258	if (apxLen > 0)
259	RestoreScannerState();
260	} // HandleLexErr
261
262
263	public static void GetToken() {
264	//-----------------------------------\|----------------------------------------
265	token = -1;
266	tokenStr = null;
267	do {
268	// --- skip ignored chars and comments ---
269	for (;;) {
270	while (Sets.member(curCh, lt.ignoredChars))
271	NextCh();
272	if (!Sets.member(curCh, lt.commentStart))
273	break;
274	if (!Comment())
275	break;
276	} // for
277	// --- scan for next token ---
278	tokenLine = curLine;
279	tokenCol = curCol;
280	tokenStrLen = 0;
281	apxLen = 0;
282	state = (curCh == Utils.EF) ? 1 : lt.startTab[curCh];
283	for (;;) {
284	tokenStrArr[tokenStrLen++]= curCh;
285	NextCh();
286	switch (state) {
287	case 0:
288	Errors.LexError(tokenLine, tokenCol, "invalid token start");
289	break;
290	case 1:
291	token = 0;
292	tokenStrLen = 0;
293	break; // EOF recognized
294	case 2:
295	token = 17;
296	break; // '=' recognized
297	case 3:
298	token = 18;
299	break; // '\|' recognized
300	case 4:
301	token = 20;
302	break; // '(' recognized
303	case 5:
304	token = 21;
305	break; // ')' recognized
306	case 6:
307	token = 22;
308	break; // '[' recognized
309	case 7:
310	token = 23;
311	break; // ']' recognized
312	case 8:
313	token = 24;
314	break; // '{' recognized
315	case 9:
316	token = 25;
317	break; // '}' recognized
318	case 10:
319	if (curCh == '>') {
320	state = 11;
321	continue;
322	} // if
323	else {
324	HandleLexErr();
325	break;
326	} // else
327	case 11:
328	token = 26;
329	break; // '>>' recognized
330	case 12:
331	token = 27;
332	break; // '..' recognized
333	case 13:
334	if (Sets.member(curCh, lt.cls[0])) {
335	state = 13;
336	continue;
337	} // if
338	else if (Sets.member(curCh, lt.cls[1])) {
339	state = 13;
340	continue;
341	} // if
342	else {
343	token = KeywordCheck();
344	if (token >= 0)
345	break; // keyword recognized
346	token = 28;
347	break; // ident recognized
348	} // else
349	case 14:
350	if (curCh == '<') {
351	state = 15;
352	continue;
353	} // if
354	else {
355	HandleLexErr();
356	break;
357	} // else
358	case 15:
359	token = 29;
360	break; // source recognized
361	case 16:
362	if (Sets.member(curCh, lt.cls[1])) {
363	state = 13;
364	continue;
365	} // if
366	else if (Sets.member(curCh, lt.cls[2])) {
367	state = 16;
368	continue;
369	} // if
370	else if (Sets.member(curCh, lt.cls[3])) {
371	state = 13;
372	continue;
373	} // if
374	else {
375	token = KeywordCheck();
376	if (token >= 0)
377	break; // keyword recognized
378	token = 28;
379	break; // ident recognized
380	} // else
381	case 17:
382	if (curCh == '.') {
383	state = 12;
384	continue;
385	} // if
386	else {
387	token = 19;
388	break; // '.' recognized
389	} // else
390	} // switch
391	break;
392	} // for
393	} while (token < 0);
394	if (tokenStr == null)
395	tokenStr = new String(tokenStrArr, 0, tokenStrLen);
396	} // GetToken
397
398	private static int KeywordCheck() {
399	tokenStr = new String(tokenStrArr, 0, tokenStrLen - apxLen);
400	Object token = kwHt[tokenStr];
401	return (token == null) ? -1 : (int)token;
402	} // KeywordCheck
403
404
405	public static int Hash(String s) {
406	//-----------------------------------\|----------------------------------------
407	Object spix = nHt[s];
408	if (spix == null) {
409	if (caseSensitive)
410	nl.Add(s);
411	else
412	nl.Add(s.ToUpper());
413	spix = nl.Count - 1;
414	nHt[s] = spix;
415	} // if
416	return (int)spix;
417	} // Hash
418
419
420	public static String HashedStr(int spix) {
421	//-----------------------------------\|----------------------------------------
422	return (String)nl[spix];
423	} // HashedStr
424
425
426	public static void GETidentAttr() {
427	} // GETidentAttr
428
429	public static void GETsourceAttr() {
430	} // GETsourceAttr
431
432	} // GPDefSyntaxAnalyzerLex
433
434	// End of GPDefSyntaxAnalyzerLex.cs
435	//=====================================\|========================================

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