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added support for ugly tokens

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This commit is contained in:
Luiz Henrique de Figueiredo 1994-09-22 09:44:00 -03:00
parent 98d9509676
commit 24c962de43
1 changed files with 65 additions and 18 deletions
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83
lex.c
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@ -1,5 +1,8 @@
char *rcs_lex = "$Id: lex.c,v 2.3 1994/08/17 17:41:50 celes Exp celes $";
char *rcs_lex = "$Id: lex.c,v 2.4 1994/09/05 19:14:40 celes Exp lhf $";
/*$Log: lex.c,v $
* Revision 2.4 1994/09/05 19:14:40 celes
* escapes \' e \" em strings; correcao do escape \\
*
* Revision 2.3 1994/08/17 17:41:50 celes
* Implementacao da macro 'lua_strcmp'
*
@ -33,7 +36,7 @@ char *rcs_lex = "$Id: lex.c,v 2.3 1994/08/17 17:41:50 celes Exp celes $";
#include "table.h"
#include "y.tab.h"
#define lua_strcmp(a,b) (a[0]<b[0]?(-1):(a[0]>b[0]?(1):strcmp(a,b)))
#define lua_strcmp(a,b) (a[0]<b[0]?(-1):(a[0]>b[0]?(1):strcmp(a,b)))
#define next() { current = input(); }
#define save(x) { *yytextLast++ = (x); }
@ -60,7 +63,7 @@ char *lua_lasttext (void)
/* The reserved words must be listed in lexicographic order */
static struct
static struct
{
char *name;
int token;
@ -82,6 +85,30 @@ static struct
{"until", UNTIL},
{"while", WHILE} };
enum
{
U_and=128,
U_do,
U_else,
U_elseif,
U_end,
U_function,
U_if,
U_local,
U_nil,
U_not,
U_or,
U_repeat,
U_return,
U_then,
U_until,
U_while,
U_le = '<'+128,
U_ge = '>'+128,
U_ne = '~'+128,
U_sc = '.'+128
};
#define RESERVEDSIZE (sizeof(reserved)/sizeof(reserved[0]))
@ -134,23 +161,23 @@ int yylex ()
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 '~';
@ -161,12 +188,12 @@ int yylex ()
{
int del = current;
next(); /* skip the delimiter */
while (current != del)
while (current != del)
{
switch (current)
{
case 0:
case '\n':
case 0:
case '\n':
return WRONGTOKEN;
case '\\':
next(); /* do not save the '\' */
@ -180,7 +207,7 @@ int yylex ()
default : save(current); next(); break;
}
break;
default:
default:
save_and_next();
}
}
@ -212,12 +239,12 @@ int yylex ()
yylval.pChar = yytext[currentText];
return NAME;
}
case '.':
save_and_next();
if (current == '.')
{
save_and_next();
if (current == '.')
{
save_and_next();
return CONC;
}
else if (!isdigit(current)) return '.';
@ -226,7 +253,7 @@ int yylex ()
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();
@ -241,12 +268,32 @@ fraction: while (isdigit(current)) save_and_next();
yylval.vFloat = atof(yytext[currentText]);
return NUMBER;
case U_and: return AND;
case U_do: return DO;
case U_else: return ELSE;
case U_elseif: return ELSEIF;
case U_end: return END;
case U_function: return FUNCTION;
case U_if: return IF;
case U_local: return LOCAL;
case U_nil: return NIL;
case U_not: return NOT;
case U_or: return OR;
case U_repeat: return REPEAT;
case U_return: return RETURN;
case U_then: return THEN;
case U_until: return UNTIL;
case U_while: return WHILE;
case U_le: return LE;
case U_ge: return GE;
case U_ne: return NE;
case U_sc: return CONC;
default: /* also end of file */
{
save_and_next();
return yytext[currentText][0];
return yytext[currentText][0];
}
}
}
}