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%{
#define USE_PURE_PARSER
#ifdef USE_PURE_PARSER
#define YY_DECL int yylex (YYSTYPE *lvalp)
#define YY_LVALP lvalp
#else
#define YY_LVALP (&yylval)
#endif
/* get current pos (offset from start of line) */
#define YY_USER_ACTION lex_pos=yy_bp - YY_CURRENT_BUFFER->yy_ch_buf;
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "eval.h"
#include "evaltype.h"
#include "evalparse.h"
static int lex_pos;
static int char2int(char a, int base)
{
int i;
if ((a>='A') && (a<='Z')) {
i=a-'A'+10;
} else if ((a>='a') && (a<='z')) {
i=a-'a'+10;
} else if ((a>='0') && (a<='9')) {
i=a-'0';
} else return -1;
if (i>=base) return -1;
return i;
}
static int parse_float(eval_scalar *f, char *fpn)
{
char *end;
double d;
d=strtod(fpn, &end);
if (*end == 0) {
f->type=SCALAR_FLOAT;
f->scalar.floatnum.value=d;
return 1;
}
return 0;
}
static int parse_integer(eval_scalar *i, char *num, int base, int lenmod)
{
uint64 k = 0;
int l = strlen(num) + lenmod;
while (l--) {
int c=char2int(*num, base);
if (c==-1) return 0;
k *= base;
k += c;
num++;
}
i->type=SCALAR_INT;
i->scalar.integer.value=k;
i->scalar.integer.type=TYPE_UNKNOWN;
return 1;
}
static int parse_cstring(eval_scalar *r, char *s, int len)
{
char *result;
int alloclen = len;
if (alloclen < 1) alloclen = 1;
r->type = SCALAR_STR;
r->scalar.str.value = (char*)malloc(alloclen);
if (!r->scalar.str.value) return 0;
result = r->scalar.str.value;
// may not end with '\\'
if (len && s[len-1] == '\\') return 0;
while (s && *s && len) {
if (*s == '\\') {
s++;len--;if (!len) break;
switch (*s) {
case '0':
*result++='\0';
break;
case 'a':
*result++='\a';
break;
case 'b':
*result++='\b';
break;
case 'e':
*result++='\e';
break;
case 'f':
*result++='\f';
break;
case 'n':
*result++='\n';
break;
case 'r':
*result++='\r';
break;
case 't':
*result++='\t';
break;
case 'v':
*result++='\v';
break;
case '\"':
*result++='"';
break;
case '\\':
*result++='\\';
break;
case 'x': {
int p, q;
s++;len--;if (!len) break;
p=char2int(*s, 16);
if (p==-1) return 0;
s++;len--;if (!len) break;
q=char2int(*s, 16);
if (q==-1) return 0;
*result++=(char)p*16+q;
break;
}
default:
*result++='\\';
if (len) *result++=*s;
break;
}
} else {
*result++ = *s;
}
s++;len--;
}
r->scalar.str.len=result-r->scalar.str.value;
return 1;
}
static int parse_pstring(eval_scalar *s, char *cstr, int len)
{
int alloclen=len;
if (!len) alloclen=1;
s->type=SCALAR_STR;
s->scalar.str.value=(char*)malloc(alloclen);
memcpy(s->scalar.str.value, cstr, len);
s->scalar.str.len=len;
return 1;
}
void *lex_current_buffer()
{
return (void*)YY_CURRENT_BUFFER;
}
int lex_current_buffer_pos()
{
return lex_pos;
}
void lex_switch_buffer(void *buffer)
{
yy_switch_to_buffer(buffer);
}
void lex_delete_buffer(void *buffer)
{
yy_delete_buffer(buffer);
}
void *lex_scan_string_buffer(const char *str)
{
return yy_scan_string(str);
}
/*
*/
%}
%option noyywrap
%%
[ \t]+ /* nop */
\"(\\\"|[^"])*\" if (parse_cstring(&YY_LVALP->scalar, yytext+1, strlen(yytext+1)-1)) return EVAL_STR;
'[^']*' if (parse_pstring(&YY_LVALP->scalar, yytext+1, strlen(yytext+1)-1)) return EVAL_STR;
lt return EVAL_STR_LT;
le return EVAL_STR_LE;
gt return EVAL_STR_GT;
ge return EVAL_STR_GE;
eq return EVAL_STR_EQ;
ne return EVAL_STR_NE;
\*\* return EVAL_POW;
\<\< return EVAL_SHL;
\>\> return EVAL_SHR;
\< return EVAL_LT;
\<\= return EVAL_LE;
\> return EVAL_GT;
\>\= return EVAL_GE;
\=\= return EVAL_EQ;
\!\= return EVAL_NE;
\&\& return EVAL_LAND;
\|\| return EVAL_LOR;
\^\^ return EVAL_LXOR;
[$@a-zA-Z_][a-zA-Z0-9_]* YY_LVALP->ident=strdup(yytext); return EVAL_IDENT;
[0-9]+\.[0-9]+([eE][+-]?[0-9]+)? if (parse_float(&YY_LVALP->scalar, yytext)) return EVAL_FLOAT;
[0-9]+ if (parse_integer(&YY_LVALP->scalar, yytext, 10, 0)) return EVAL_INT;
0x[0-9a-fA-F]+ if (parse_integer(&YY_LVALP->scalar, yytext+2, 16, 0)) return EVAL_INT;
[0-9][0-9a-fA-F]*h if (parse_integer(&YY_LVALP->scalar, yytext, 16, -1)) return EVAL_INT;
[0-9]+d if (parse_integer(&YY_LVALP->scalar, yytext, 10, -1)) return EVAL_INT;
[0-7]+o if (parse_integer(&YY_LVALP->scalar, yytext, 8, -1)) return EVAL_INT;
[0-1]+b if (parse_integer(&YY_LVALP->scalar, yytext, 2, -1)) return EVAL_INT;
. return *yytext;
\n return '\n';
%%
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