| char *rcs_lex = "$Id: lex.c,v 1.3 1993/12/28 16:42:29 roberto Exp celes $"; |
| /*$Log: lex.c,v $ |
| * Revision 1.3 1993/12/28 16:42:29 roberto |
| * "include"s de string.h e stdlib.h para evitar warnings |
| * |
| * Revision 1.2 1993/12/22 21:39:15 celes |
| * Tratamento do token $debug e $nodebug |
| * |
| * Revision 1.1 1993/12/22 21:15:16 roberto |
| * Initial revision |
| **/ |
| |
| #include <ctype.h> |
| #include <math.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include "opcode.h" |
| #include "hash.h" |
| #include "inout.h" |
| #include "table.h" |
| #include "y.tab.h" |
| |
| #define next() { current = input(); } |
| #define save(x) { *yytextLast++ = (x); } |
| #define save_and_next() { save(current); next(); } |
| |
| static int current; |
| static char yytext[256]; |
| static char *yytextLast; |
| |
| static Input input; |
| |
| void lua_setinput (Input fn) |
| { |
| current = ' '; |
| input = fn; |
| } |
| |
| char *lua_lasttext (void) |
| { |
| *yytextLast = 0; |
| return yytext; |
| } |
| |
| |
| static struct |
| { |
| char *name; |
| int token; |
| } reserved [] = { |
| {"and", AND}, |
| {"do", DO}, |
| {"else", ELSE}, |
| {"elseif", ELSEIF}, |
| {"end", END}, |
| {"function", FUNCTION}, |
| {"if", IF}, |
| {"local", LOCAL}, |
| {"nil", NIL}, |
| {"not", NOT}, |
| {"or", OR}, |
| {"repeat", REPEAT}, |
| {"return", RETURN}, |
| {"then", THEN}, |
| {"until", UNTIL}, |
| {"while", WHILE} }; |
| |
| #define RESERVEDSIZE (sizeof(reserved)/sizeof(reserved[0])) |
| |
| |
| int findReserved (char *name) |
| { |
| int l = 0; |
| int h = RESERVEDSIZE - 1; |
| while (l <= h) |
| { |
| int m = (l+h)/2; |
| int comp = strcmp(name, reserved[m].name); |
| if (comp < 0) |
| h = m-1; |
| else if (comp == 0) |
| return reserved[m].token; |
| else |
| l = m+1; |
| } |
| return 0; |
| } |
| |
| |
| int yylex () |
| { |
| while (1) |
| { |
| yytextLast = yytext; |
| switch (current) |
| { |
| case '\n': lua_linenumber++; |
| case ' ': |
| case '\t': |
| next(); |
| continue; |
| |
| case '$': |
| next(); |
| while (isalnum(current) || current == '_') |
| save_and_next(); |
| *yytextLast = 0; |
| if (strcmp(yytext, "debug") == 0) |
| { |
| yylval.vInt = 1; |
| return DEBUG; |
| } |
| else if (strcmp(yytext, "nodebug") == 0) |
| { |
| yylval.vInt = 0; |
| return DEBUG; |
| } |
| return WRONGTOKEN; |
| |
| case '-': |
| save_and_next(); |
| if (current != '-') return '-'; |
| do { next(); } while (current != '\n' && current != 0); |
| continue; |
| |
| case '<': |
| save_and_next(); |
| if (current != '=') return '<'; |
| else { save_and_next(); return LE; } |
| |
| case '>': |
| save_and_next(); |
| if (current != '=') return '>'; |
| else { save_and_next(); return GE; } |
| |
| case '~': |
| save_and_next(); |
| if (current != '=') return '~'; |
| else { save_and_next(); return NE; } |
| |
| case '"': |
| case '\'': |
| { |
| int del = current; |
| next(); /* skip the delimiter */ |
| while (current != del) |
| { |
| switch (current) |
| { |
| case 0: |
| case '\n': |
| return WRONGTOKEN; |
| case '\\': |
| next(); /* do not save the '\' */ |
| switch (current) |
| { |
| case 'n': save('\n'); next(); break; |
| case 't': save('\t'); next(); break; |
| case 'r': save('\r'); next(); break; |
| default : save('\\'); break; |
| } |
| break; |
| default: |
| save_and_next(); |
| } |
| } |
| next(); /* skip the delimiter */ |
| *yytextLast = 0; |
| yylval.vWord = lua_findconstant (yytext); |
| return STRING; |
| } |
| |
| case 'a': case 'b': case 'c': case 'd': case 'e': |
| case 'f': case 'g': case 'h': case 'i': case 'j': |
| case 'k': case 'l': case 'm': case 'n': case 'o': |
| case 'p': case 'q': case 'r': case 's': case 't': |
| case 'u': case 'v': case 'w': case 'x': case 'y': |
| case 'z': |
| case 'A': case 'B': case 'C': case 'D': case 'E': |
| case 'F': case 'G': case 'H': case 'I': case 'J': |
| case 'K': case 'L': case 'M': case 'N': case 'O': |
| case 'P': case 'Q': case 'R': case 'S': case 'T': |
| case 'U': case 'V': case 'W': case 'X': case 'Y': |
| case 'Z': |
| case '_': |
| { |
| int res; |
| do { save_and_next(); } while (isalnum(current) || current == '_'); |
| *yytextLast = 0; |
| res = findReserved(yytext); |
| if (res) return res; |
| yylval.pChar = yytext; |
| return NAME; |
| } |
| |
| case '.': |
| save_and_next(); |
| if (current == '.') |
| { |
| save_and_next(); |
| return CONC; |
| } |
| else if (!isdigit(current)) return '.'; |
| /* current is a digit: goes through to number */ |
| goto fraction; |
| |
| case '0': case '1': case '2': case '3': case '4': |
| case '5': case '6': case '7': case '8': case '9': |
| |
| do { save_and_next(); } while (isdigit(current)); |
| if (current == '.') save_and_next(); |
| fraction: while (isdigit(current)) save_and_next(); |
| if (current == 'e' || current == 'E') |
| { |
| save_and_next(); |
| if (current == '+' || current == '-') save_and_next(); |
| if (!isdigit(current)) return WRONGTOKEN; |
| do { save_and_next(); } while (isdigit(current)); |
| } |
| *yytextLast = 0; |
| yylval.vFloat = atof(yytext); |
| return NUMBER; |
| |
| default: /* also end of file */ |
| { |
| save_and_next(); |
| return *yytext; |
| } |
| } |
| } |
| } |
| |