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|
%option reentrant
%option prefix="tmpl_expr_parser_"
%option bison-bridge
%option noyywrap
%option yylineno
%option nodefault
%option header-file="tmpl-expr-scanner.h"
%option outfile="tmpl-expr-scanner.c"
%{
# include "tmpl-error.h"
# include "tmpl-expr-private.h"
# include "tmpl-expr-parser-private.h"
# include "tmpl-expr-parser.h"
#pragma GCC diagnostic ignored "-Wswitch-default"
#pragma GCC diagnostic ignored "-Wunused-function"
%}
%option extra-type="TmplExprParser *"
/* float exponent */
EXP ([Ee][-+]?[0-9]+)
%%
%{
TmplExprParser *parser = yyextra;
%}
/* single character ops */
"+" |
"-" |
"*" |
"/" |
"=" |
"," |
"." |
";" |
"!" |
"(" |
")" { return yytext [0]; }
/* comparison ops */
">" { yylval->cmp = TMPL_EXPR_GT; return CMP; }
"<" { yylval->cmp = TMPL_EXPR_LT; return CMP; }
"!=" { yylval->cmp = TMPL_EXPR_NE; return CMP; }
"==" { yylval->cmp = TMPL_EXPR_EQ; return CMP; }
">=" { yylval->cmp = TMPL_EXPR_GTE; return CMP; }
"<=" { yylval->cmp = TMPL_EXPR_LTE; return CMP; }
"||" { yylval->cmp = TMPL_EXPR_OR; return CMP; }
"&&" { yylval->cmp = TMPL_EXPR_AND; return CMP; }
/* keywords */
"if" { return IF; }
"then" { return THEN; }
"else" { return ELSE; }
"while" { return WHILE; }
"do" { return DO; }
"func" { return FUNC; }
"require" { return REQUIRE; }
"version" { return VERSION; }
"true" { yylval->b = 1; return BOOL; }
"false" { yylval->b = 0; return BOOL; }
/* builtin functions */
"ceil" { yylval->fn = TMPL_EXPR_BUILTIN_CEIL; return BUILTIN; }
"floor" { yylval->fn = TMPL_EXPR_BUILTIN_FLOOR; return BUILTIN; }
"hex" { yylval->fn = TMPL_EXPR_BUILTIN_HEX; return BUILTIN; }
"log" { yylval->fn = TMPL_EXPR_BUILTIN_LOG; return BUILTIN; }
"print" { yylval->fn = TMPL_EXPR_BUILTIN_PRINT; return BUILTIN; }
"repr" { yylval->fn = TMPL_EXPR_BUILTIN_REPR; return BUILTIN; }
"sqrt" { yylval->fn = TMPL_EXPR_BUILTIN_SQRT; return BUILTIN; }
/* string literals */
L?\"(\\.|[^\\"])*\" { yylval->s = yytext; return STRING_LITERAL; }
/* names */
[a-zA-Z_][a-zA-Z0-9_]* {
yylval->s = g_strdup (yytext);
return NAME;
}
[0-9]+"."[0-9]*{EXP}? |
"."?[0-9]+{EXP}? { yylval->d = atof(yytext); return NUMBER; }
"//".*
[ \t] /* ignore whitespace */
\\n { printf ("c> "); }
"\n" { return EOL; }
<<EOF>> { parser->reached_eof = TRUE; return EOL; }
. {
g_free (parser->error_str);
parser->error_str = g_strdup (yytext);
parser->error_line = yylineno;
}
%%
void
tmpl_expr_parser_init_scanner (TmplExprParser *parser)
{
g_assert (parser != NULL);
yylex_init (&parser->scanner);
yyset_extra (parser, parser->scanner);
}
void
tmpl_expr_parser_destroy_scanner (TmplExprParser *parser)
{
g_assert (parser != NULL);
yylex_destroy (parser->scanner);
}
void
tmpl_expr_parser_flush (TmplExprParser *parser)
{
struct yyguts_t *yyg;
g_assert (parser != NULL);
yyg = (struct yyguts_t *)parser->scanner;
tmpl_expr_parser__flush_buffer (YY_CURRENT_BUFFER, parser->scanner);
}
gboolean
tmpl_expr_parser_parse_string (TmplExprParser *self,
const gchar *input,
GError **error)
{
YY_BUFFER_STATE buf;
gint ret;
g_return_val_if_fail (self != NULL, FALSE);
buf = tmpl_expr_parser__scan_string (input, self->scanner);
ret = tmpl_expr_parser_parse (self);
tmpl_expr_parser__delete_buffer (buf, self->scanner);
if (self->error_str)
{
g_set_error (error,
TMPL_ERROR,
TMPL_ERROR_SYNTAX_ERROR,
"%s", self->error_str);
return FALSE;
}
if (ret == 0)
return TRUE;
g_set_error (error,
TMPL_ERROR,
TMPL_ERROR_SYNTAX_ERROR,
"Failed to parse expression");
return FALSE;
}
gboolean
tmpl_expr_parser_init (TmplExprParser *self,
GError **error)
{
g_return_val_if_fail (self != NULL, FALSE);
memset (self, 0, sizeof *self);
tmpl_expr_parser_init_scanner (self);
return TRUE;
}
void
tmpl_expr_parser_destroy (TmplExprParser *self)
{
if (self != NULL)
{
tmpl_expr_parser_destroy_scanner (self);
g_clear_pointer (&self->ast, tmpl_expr_unref);
g_clear_pointer (&self->error_str, g_free);
}
}
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