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|
/*
* IB Pseudocode Parser
*
* Copyright (C) 2024 Runxi Yu <https://runxiyu.org>
* SPDX-License-Identifier: AGPL-3.0-or-later
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
%{
#include "ibpctypes.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
extern int yylex();
void yyerror(const char *s);
void emit(const char *fmt, ...);
%}
%union {
long long integer;
double real;
char *string;
char *id;
}
%token <integer> INTEGER_LIT
%token <real> REAL_LIT
%token <string> STRING_LIT
%token <id> IDENTIFIER
%token NULL_LIT TRUE FALSE FUNC RETURN END IF ELSE THEN LOOP WHILE UNTIL FROM TO BREAK CONTINUE INPUT OUTPUT AND OR NOT NEWLINE ASSIGN LPAREN RPAREN COMMA
%left AND OR
%left EQ NEQ LT GT LEQ GEQ
%left PLUS MINUS
%left TIMES DIV INTEGER_DIV MOD MOD_OP
%right NOT_OP
%type <string> expression assignment_statement if_statement loop_statement statement_list io_statement function_definition parameter_list statement
%%
program:
program statement
| statement
;
statement:
expression_statement
| assignment_statement
| control_flow_statement
| io_statement
| function_definition
;
expression_statement:
expression NEWLINE { }
;
assignment_statement:
IDENTIFIER ASSIGN expression NEWLINE {
emit("%s = %s;\n", $1, $3);
free($1);
free($3);
}
;
expression:
INTEGER_LIT {
char buffer[32];
snprintf(buffer, sizeof(buffer), "%lld", $1);
$$ = strdup(buffer);
}
| REAL_LIT {
char buffer[32];
snprintf(buffer, sizeof(buffer), "%lf", $1);
$$ = strdup(buffer);
}
| STRING_LIT {
$$ = strdup($1);
free($1);
}
| TRUE {
$$ = strdup("1");
}
| FALSE {
$$ = strdup("0");
}
| NULL_LIT {
$$ = strdup("NULL");
}
| IDENTIFIER {
$$ = strdup($1);
}
| expression PLUS expression {
asprintf(&$$, "%s + %s", $1, $3);
free($1);
free($3);
}
| expression MINUS expression {
asprintf(&$$, "%s - %s", $1, $3);
free($1);
free($3);
}
| expression TIMES expression {
asprintf(&$$, "%s * %s", $1, $3);
free($1);
free($3);
}
| expression DIV expression {
asprintf(&$$, "%s / %s", $1, $3);
free($1);
free($3);
}
| LPAREN expression RPAREN {
asprintf(&$$, "(%s)", $2);
free($2);
}
;
control_flow_statement:
if_statement
| loop_statement
;
if_statement:
IF expression THEN statement_list END IF {
emit("if (%s) {\n%s}\n", $2, $4);
free($2);
free($4);
}
| IF expression THEN statement_list ELSE statement_list END IF {
emit("if (%s) {\n%s} else {\n%s}\n", $2, $4, $6);
free($2);
free($4);
free($6);
}
;
loop_statement:
LOOP WHILE expression statement_list END LOOP {
emit("while (%s) {\n%s}\n", $3, $4);
free($3);
free($4);
}
| LOOP UNTIL expression statement_list END LOOP {
emit("while (!(%s)) {\n%s}\n", $3, $4);
free($3);
free($4);
}
| LOOP IDENTIFIER FROM expression TO expression statement_list END LOOP {
emit("for (long long %s = %s; %s <= %s; ++%s) {\n%s}\n",
$2, $4, $2, $6, $2, $7);
free($2);
free($4);
free($6);
free($7);
}
;
statement_list:
statement_list statement {
asprintf(&$$, "%s%s", $1, $2);
free($1);
free($2);
}
| statement {
$$ = strdup($1);
free($1);
}
;
io_statement:
INPUT IDENTIFIER NEWLINE {
emit("char buffer[1024];\nfgets(buffer, sizeof(buffer), stdin);\n%s = strdup(buffer);\n", $2);
free($2);
}
| OUTPUT expression NEWLINE {
emit("printf(\"%%s\", %s);\n", $2);
free($2);
}
;
function_definition:
FUNC IDENTIFIER LPAREN parameter_list RPAREN statement_list END IDENTIFIER {
emit("void %s(%s) {\n%s}\n", $2, $4, $6);
free($2);
free($4);
free($6);
}
;
parameter_list:
IDENTIFIER {
$$ = strdup($1);
}
| parameter_list COMMA IDENTIFIER {
asprintf(&$$, "%s, %s", $1, $3);
free($1);
free($3);
}
;
%%
void yyerror(const char *s) {
fprintf(stderr, "Error: %s\n", s);
}
void emit(const char *fmt, ...) {
va_list args;
va_start(args, fmt);
vprintf(fmt, args);
va_end(args);
}
int main(int argc, char **argv) {
printf("#include <stdio.h>\n#include <stdlib.h>\n#include \"ibpctypes.h\"\n\n");
yyparse();
return 0;
}
|
