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|
/* parser for CPC++ */
%{
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "functions.h"
char st[1024];
int yylex(void);
int yyerror(const char* s);
extern int yylineno;
void set_input_string(const char* s);
void end_lexical_scan(void);
%}
%union {
int ival;
double dval;
char *sval;
}
// function tokens
%token FN_ABS
%token FN_INT
%token FN_SGN
// keywords tokens
%token KW_CLG
%token KW_CLS
%token KW_DRAWR
%token KW_DRAW
%token KW_FILL
%token KW_GPAPER // also used as function
%token KW_GPEN // also used as function
%token KW_INK
%token KW_LOCATE
%token KW_MODE // also used as function
%token KW_MOVER
%token KW_MOVE
%token KW_ORIGIN
%token KW_PAPER // also used as function
%token KW_PEN // also used as function
%token KW_PLOTR
%token KW_PLOT
%token KW_PRINT
// additionnals tokens
%token OP
%token CP
%token COMMA
%token COLON
%token SEMICOLON
%token <dval> NUMFLOAT
%token <ival> NUMINT
%token <sval> ALPHANUM
%token PLUS
%token MINUS
%token MUL
%token DIV
%token EDIV
%token MOD
%token EOL
%token GARBAGE
%type <dval> func param exp factor term
%type <ival> iparam
%type <sval> sparamlist sparam numstringparam strings2 strings1 string
%%
execute: /* nothing here */
| execute line EOL
| execute EOL
;
line: colons
| command
| command colons
| line command
| line command colons
;
colons: COLON
| colons COLON
;
command: KW_CLG { CPC_CLG(); }
| KW_CLS { CPC_CLS(); }
| KW_DRAWR iparam COMMA iparam COMMA iparam { CPC_DRAWR3($2, $4, $6); }
| KW_DRAWR iparam COMMA iparam { CPC_DRAWR2($2, $4); }
| KW_DRAW iparam COMMA iparam COMMA iparam { CPC_DRAW3($2, $4, $6); }
| KW_DRAW iparam COMMA iparam { CPC_DRAW2($2, $4); }
| KW_FILL iparam COMMA iparam COMMA iparam { CPC_FILL3($2, $4, $6); }
| KW_FILL iparam COMMA iparam { CPC_FILL2($2, $4); }
| KW_GPAPER iparam { CPC_GRAPHIC_PAPER($2); }
| KW_GPEN iparam { CPC_GRAPHIC_PEN($2); }
| KW_MOVER iparam COMMA iparam { CPC_MOVER($2, $4); }
| KW_MOVE iparam COMMA iparam { CPC_MOVE($2, $4); }
| KW_ORIGIN iparam COMMA iparam { CPC_ORIGIN($2, $4); }
| KW_INK iparam COMMA iparam { CPC_INK($2, $4); }
| KW_LOCATE iparam COMMA iparam { CPC_LOCATE($2, $4); }
| KW_MODE iparam { CPC_MODE($2); }
| KW_PAPER iparam { CPC_PAPER($2); }
| KW_PEN iparam { CPC_PEN($2); }
| KW_PLOTR iparam COMMA iparam COMMA iparam { CPC_PLOTR3($2, $4, $6); }
| KW_PLOTR iparam COMMA iparam { CPC_PLOTR2($2, $4); }
| KW_PLOT iparam COMMA iparam COMMA iparam { CPC_PLOT3($2, $4, $6); }
| KW_PLOT iparam COMMA iparam { CPC_PLOT2($2, $4); }
| KW_PRINT sparamlist { CPC_PRINT((char*)$2); }
;
sparamlist: sparam { $$ = $1; }
| sparamlist COMMA sparam { $$ = strcat($1, $3); }
;
sparam: strings1
| strings2
| numstringparam
;
numstringparam: param { if(round($1) != $1) { sprintf(st, "%f", $1); } else { sprintf(st, "%d", (int)$1); } $$ = (char*)st; }
;
func: FN_ABS OP param CP { $$ = fabs($3); }
| KW_MODE OP CP { $$ = (double)CPC_GET_MODE(); }
| KW_GPAPER OP CP { $$ = (double)CPC_GET_GRAPHIC_PAPER(); }
| KW_GPEN OP CP { $$ = (double)CPC_GET_GRAPHIC_PEN(); }
| FN_INT OP param CP { $$ = (double)CPC_INT($3); }
| KW_PAPER OP CP { $$ = (double)CPC_GET_PAPER(); }
| KW_PEN OP CP { $$ = (double)CPC_GET_PEN(); }
| FN_SGN OP param CP { $$ = (double)CPC_SGN($3); }
;
iparam: param { $$ = (int)round($1); }
;
param: exp
| PLUS exp { $$ = $2; }
| MINUS exp { $$ = -$2; }
;
exp: factor
| exp PLUS factor { $$ = $1 + $3; }
| exp MINUS factor { $$ = $1 - $3; }
;
factor: term
| factor MUL term { $$ = $1 * $3; }
| factor DIV term { $$ = $1 / $3; }
| factor EDIV term { $$ = (double)((int)((int)$1 / (int)$3)); }
| factor MOD term { $$ = (double)(((int)$1) % ((int)$3)); }
;
term: NUMINT { $$ = (double)$1; }
| NUMFLOAT
| func;
;
strings2: string SEMICOLON { $$ = $1;}
| strings2 string { $$ = strcat($1, $2);}
| strings2 string SEMICOLON { $$ = strcat($1, $2);}
;
strings1: string { $$ = $1;}
| strings1 PLUS string { $$ = strcat($1, $3);}
;
string: ALPHANUM { char* p = $$; p++; p[strlen(p) - 1] = 0; $$ = p; }
;
%%
int yyerror(const char *s) {
// show syntax error at line
//ed->SetError(ERR_SYNTAX_ERROR, "Syntax error", yylineno);
return 1;
}
// parses a string
int parse_string(const char* s) {
set_input_string(s);
int ret = yyparse();
end_lexical_scan();
return ret;
} |
Flex Bison C, erreur de noob
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