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Up to [Research Unix] / researchv10no / cmd / ideal|
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1.1 root 1: %{
2: #include "ideal.h"
3: #include "y.tab.h"
4: extern int lineno, yylval;
5: extern boolean flyback;
6:
7: #define BUFLEN 100
8:
9: struct filenode {
10: struct filenode *next;
11: FILE *file;
12: int lineno;
13: char *name;
14: char buf[BUFLEN];
15: int head;
16: };
17:
18: struct filenode *filestack = NULL;
19:
20: FILE *curfile;
21: #undef input
22: #undef unput
23:
24: boolean file_start = TRUE;
25: boolean just_popped = FALSE;
26:
27: void filepush ();
28: void filepop ();
29: char input ();
30: void unput ();
31: %}
32: %Start PROGRAM COMMENT OUTSIDE LIBRARY INCLUDE
33: %%
34: %{
35: int numitems, i;
36: char item[5][20];
37: char cmd[20];
38: static int ISnest, bracenest, commnest, omode;
39: if (file_start) {
40: BEGIN OUTSIDE;
41: ISnest = 0;
42: };
43: file_start = FALSE;
44: %}
45: <OUTSIDE>^\.IS.*\n {
46: BEGIN PROGRAM;
47: if (!ISnest)
48: printf ("%s", yytext);
49: ISnest ++;
50: bracenest = commnest = 0;
51: }
52: <OUTSIDE>[ \t] {
53: if (just_popped) {
54: if (omode == LIBFIL)
55: BEGIN LIBRARY;
56: else if (omode == CHATTY)
57: BEGIN INCLUDE;
58: else impossible ("idlex");
59: just_popped = FALSE;
60: } else
61: printf ("%s", yytext);
62: }
63: <OUTSIDE>. {
64: printf ("%s", yytext);
65: }
66: <OUTSIDE>\n {
67: if (just_popped) {
68: BEGIN PROGRAM;
69: just_popped = FALSE;
70: } else {
71: printf ("\n");
72: }
73: }
74: <PROGRAM>box return(yylval = BOX);
75: <PROGRAM>var return(yylval = VAR);
76: <PROGRAM>bdlist return(yylval = BDLIST);
77: <PROGRAM>boundary return(yylval = BDLIST);
78: <PROGRAM>put return(yylval = PUT);
79: <PROGRAM>conn return(yylval = CONN);
80: <PROGRAM>to return(yylval = TO);
81: <PROGRAM>using return(yylval = USING);
82: <PROGRAM>construct return(yylval = CONSTRUCT);
83: <PROGRAM>draw return(yylval = DRAW);
84: <PROGRAM>opaque return(yylval = OPAQUE);
85: <PROGRAM>left return(yylval = LEFT);
86: <PROGRAM>text return(yylval = CENTER);
87: <PROGRAM>right return(yylval = RIGHT);
88: <PROGRAM>spline return(yylval = SPLINE);
89: <PROGRAM>at return(yylval = AT);
90: <PROGRAM>interior return(yylval = INTERIOR);
91: <PROGRAM>exterior return(yylval = EXTERIOR);
92: <PROGRAM>[a-zA-Z][a-zA-Z0-9]* {
93: yylval = lookup(&yytext[0]);
94: return(NAME);
95: }
96: <PROGRAM>[0-9]+|[0-9]*\.[0-9]+|[0-9]+\.[0-9]*|[0-9]+\.?[0-9]*[eE]\ *[+\-]?[0-9]+|[0-9]*\.[0-9]+[eE]\ *[+\-]?[0-9]+ {
97: float temp;
98: sscanf(yytext, "%f", &temp);
99: yylval = (int) fextlgen(temp);
100: return(CONST);
101: }
102: <PROGRAM>^\.\.\.forget.* {
103: numitems = sscanf (yytext, "%s %s %s %s %s %s",
104: cmd,
105: &item[0][0],
106: &item[1][0],
107: &item[2][0],
108: &item[3][0],
109: &item[4][0]
110: );
111: numitems --;
112: for (i = 0; i < numitems; i ++)
113: forget (lookup (&item[i][0]));
114: }
115: <PROGRAM>^\.\.\.radians.* radflag = TRUE;
116: <PROGRAM>^\.\.\.degrees.* radflag = FALSE;
117: <PROGRAM>^\.\.\.libfile {
118: omode = LIBFIL;
119: BEGIN LIBRARY;
120: }
121: <LIBRARY>[ \t]+ ;
122: <LIBRARY>[^ \t\n]+ {
123: idinclude (yytext, LIBFIL);
124: BEGIN OUTSIDE + 1;
125: }
126: <LIBRARY>\n {
127: BEGIN PROGRAM + 1;
128: }
129: <PROGRAM>^\.\.\.include {
130: omode = CHATTY;
131: BEGIN INCLUDE;
132: }
133: <INCLUDE>[ \t]+ ;
134: <INCLUDE>[^ \t\n]+ {
135: idinclude (yytext, CHATTY);
136: BEGIN OUTSIDE + 1;
137: }
138: <INCLUDE>\n {
139: BEGIN PROGRAM + 1;
140: }
141: <PROGRAM>^\.I[EF].*\n {
142: interpret ();
143: ISnest --;
144: if (!ISnest)
145: printf ("%s", yytext);
146: if (bracenest > 0)
147: fprintf (stderr, "ideal: excess {\n");
148: BEGIN OUTSIDE;
149: }
150: <PROGRAM>^\..* {
151: sscanf (yytext, "%s", cmd);
152: if (strcmp (cmd, "...libfile") && strcmp (cmd, "...include"))
153: printf ("%s\n", yytext);
154: else
155: REJECT;
156: }
157: <PROGRAM>#.* ;
158: <PROGRAM>"/*" {
159: commnest = 1;
160: BEGIN COMMENT;
161: }
162: <COMMENT>"/*" {
163: commnest ++;
164: }
165: <COMMENT>"*/" {
166: commnest --;
167: if (!commnest)
168: BEGIN PROGRAM;
169: }
170: <COMMENT>. ;
171: <COMMENT>\n {
172: }
173: <PROGRAM>"'"[^']* {
174: if (yytext[yyleng-1] == '\\') {
175: yytext[yyleng-1] = yytext[yyleng];
176: yyleng --;
177: yymore();
178: } else {
179: char *temp;
180: temp = malloc((unsigned) yyleng+1);
181: yytext[yyleng] = '\0';
182: strcpy(temp, &yytext[1]);
183: yylval = (int) temp;
184: input();
185: return(STRING);
186: }
187: }
188: <PROGRAM>\"[^\"]* {
189: if (yytext[yyleng-1] == '\\') {
190: yytext[yyleng-1] = yytext[yyleng];
191: yyleng --;
192: yymore();
193: } else {
194: char *temp;
195: temp = malloc((unsigned) yyleng+1);
196: yytext[yyleng] = '\0';
197: strcpy(temp, &yytext[1]);
198: yylval = (int) temp;
199: input();
200: return(STRING);
201: }
202: }
203: <PROGRAM>[ \t]+ {
204: if (just_popped) {
205: if (omode == LIBFIL)
206: BEGIN LIBRARY;
207: else if (omode == CHATTY)
208: BEGIN INCLUDE;
209: else impossible ("idlex");
210: just_popped = FALSE;
211: }
212: }
213: <PROGRAM>\n {
214: }
215: <PROGRAM>"{" {
216: bracenest ++;
217: return (yylval = LBRACE);
218: }
219: <PROGRAM>"}" {
220: bracenest --;
221: if (bracenest < 0)
222: fprintf (stderr, "ideal: excess }\n");
223: return (yylval = RBRACE);
224: }
225: <PROGRAM>[\<\>\(\)\[\]\+\-\*\/\=\,\;\:\.\^\~] return(yytext[0]);
226: <PROGRAM>. fprintf(stderr, "ideal: unknown input token %s flushed\n", &yytext[0]);
227: %%
228: void filepush (f)
229: FILE *f;
230: {
231: struct filenode *newfile;
232: newfile = (struct filenode *) calloc (1, sizeof (struct filenode));
233: if (newfile) {
234: newfile->next = filestack;
235: newfile->file = curfile = f;
236: newfile->head = -1;
237: if (filestack)
238: filestack->lineno = lineno;
239: newfile->name = malloc ((unsigned)strlen(filename)+1);
240: strcpy (newfile->name, filename);
241: filestack = newfile;
242: lineno = 1;
243: } else {
244: fprintf (stderr, "ideal: no room for file descriptor\n");
245: exit (1);
246: }
247: }
248:
249: void filepop ()
250: {
251: struct filenode *oldfile;
252: if (filestack) {
253: if (filestack->head > -1)
254: fprintf (stderr, "ideal: characters ignored in file %s\n", filename);
255: oldfile = filestack;
256: filestack = filestack->next;
257: fclose (oldfile->file);
258: if (filestack) {
259: curfile = filestack->file;
260: lineno = filestack->lineno;
261: filename = filestack->name;
262: } else
263: curfile = NULL;
264: free ((char *)oldfile);
265: } else {
266: fprintf (stderr, "ideal: file stack botch\n");
267: exit (1);
268: }
269: }
270:
271: int idgetc (f)
272: struct filenode *f;
273: {
274: int c;
275: if (!f)
276: return (EOF);
277: if (f->head > -1) {
278: c = f->buf[f->head--];
279: } else
280: c = getc(f->file);
281: return (c);
282: }
283:
284: char input ()
285: {
286: int c;
287: c = 0;
288: if (filestack)
289: c = idgetc(filestack);
290: while (c == EOF && filestack) {
291: filepop();
292: if (filestack) {
293: c = idgetc(filestack);
294: just_popped = TRUE;
295: }
296: else
297: c = EOF;
298: }
299: if (c == '\n')
300: lineno++;
301: return ((c == EOF)?0:c);
302: }
303:
304: void unput (c)
305: char c;
306: {
307: struct filenode *f;
308: if (f = filestack) {
309: if (f->head < BUFLEN) {
310: f->buf[++f->head] = c;
311: if (c == '\n')
312: -- lineno;
313: } else {
314: fprintf (stderr, "ideal: out of pushback space\n");
315: exit (1);
316: }
317: }
318: }
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