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/*======================================================================
* Flex Options
*/
%option outfile="flex2test.lex.c"
%option header-file="flex2test.lex.h"
%option prefix="testme_yy"
%option reentrant
%option 8bit
%option yylineno
%{
/*======================================================================
* User C Header
*/
#include <gfsm.h>
typedef enum {
T_EOF,
T_CHAR,
T_STRING,
T_WEIGHT,
T_OP_PROJ_1,
T_OP_PROJ_2,
T_OP_STAR,
T_OP_PLUS,
T_OP_POWER, //-- "^n"
T_OP_MINUS,
T_OP_OPTIONAL,
T_OP_UNION,
T_OP_COMPLEMENT,
T_OP_INTERSECT,
T_OP_PRODUCT,
T_OP_COMPOSE,
T_LPAREN,
T_RPAREN,
T_LBRACKET,
T_RBRACKET,
T_EQUAL,
T_SEMICOLON, //-- semicolon
T_OTHER
} TokenType;
#define GSTR_BUF ((GString*)((gfsmScanner*)yyextra)->data)
%}
/*======================================================================
* Flex Definitions
*/
DIGIT [0-9]
SPACE [[:space:]]
WCHAR [^\\\[ \t\n\r\#\<]
SCHAR [^\\\]]
%x ESCAPE STRING SESCAPE COMMENT WEIGHT
/*======================================================================
* Rules
*/
%%
<INITIAL>{WCHAR} { return T_CHAR; }
<INITIAL>{SPACE} { /* ignore */ }
<INITIAL># { BEGIN(COMMENT); }
<INITIAL>\\ { BEGIN(ESCAPE); }
<INITIAL>\[ { BEGIN(STRING); GSTR_BUF->len = 0; }
<INITIAL>\< { BEGIN(WEIGHT); }
<WEIGHT>[^\>]+ { return WEIGHT; /* hack */ }
<WEIGHT>\> { BEGIN(INITIAL); }
<COMMENT>[^\n]*\n { BEGIN(INITIAL); }
<ESCAPE>. { BEGIN(INITIAL); return T_CHAR; }
<STRING>\] { BEGIN(INITIAL); return T_STRING; }
<STRING>{SCHAR} { g_string_append_c(GSTR_BUF, yytext[0]); }
<STRING>\\ { BEGIN(SESCAPE); }
<SESCAPE>. { BEGIN(STRING); g_string_append_c(GSTR_BUF, yytext[0]); }
<<EOF>> { return T_EOF; }
<*>. {
gfsm_scanner_carp(yyextra, "bad character '%s'", yytext);
return T_OTHER;
}
%%
/*======================================================================
* User C Code
*/
void testme(gfsmScanner *scanner) {
TokenType tok;
double weight;
while ((tok=testme_yylex(scanner->yyscanner)) != T_EOF) {
switch (tok) {
case T_CHAR:
printf("(char) '%s'\n", testme_yyget_text(scanner->yyscanner));
break;
case STRING:
printf("(string) \"%s\"\n", ((GString*)scanner->data)->str);
break;
case WEIGHT:
weight = strtod(testme_yyget_text(scanner->yyscanner),NULL);
printf("(weight) %g\n", weight);
break;
default:
printf("(other=%d): (%s)\n", tok, testme_yyget_text(scanner->yyscanner));
break;
}
if (scanner->err) {
fprintf(stderr, "Error: %s\n", scanner->err->message);
g_clear_error(&(scanner->err));
break;
}
}
}
int main(void) {
gfsmScanner *scanner = gfsm_scanner_new("myScanner",testme_yy);
scanner->data = g_string_new("");
//-- first, scan a string
/*
gfsm_scanner_scan_string(scanner, "line 1\nline 2\nline 3.");
scanner->filename = g_strdup("string");
testme(scanner);
*/
//-- now scan stdin
gfsm_scanner_scan_filename(scanner, "-");
testme(scanner);
gfsm_scanner_free(scanner);
return 0;
}
//int testme_yywrap(yyscan_t yyscanner) { return 1; }
GFSM_SCANNER_YYWRAP(testme_yy)
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