139 lines
3.7 KiB
Text
139 lines
3.7 KiB
Text
%{
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/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "expr.h"
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#include "yydefs.h"
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#include "parser.h"
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extern int gLine;
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extern int gColumn;
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void yyerror(Expr** root, int* error_count, const char* s);
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int yyparse(Expr** root, int* error_count);
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struct yy_buffer_state;
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void yy_switch_to_buffer(struct yy_buffer_state* new_buffer);
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struct yy_buffer_state* yy_scan_string(const char* yystr);
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%}
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%locations
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%union {
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char* str;
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Expr* expr;
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struct {
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int argc;
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Expr** argv;
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} args;
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}
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%token AND OR SUBSTR SUPERSTR EQ NE IF THEN ELSE ENDIF
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%token <str> STRING BAD
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%type <expr> expr
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%type <args> arglist
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%parse-param {Expr** root}
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%parse-param {int* error_count}
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%error-verbose
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/* declarations in increasing order of precedence */
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%left ';'
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%left ','
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%left OR
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%left AND
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%left EQ NE
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%left '+'
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%right '!'
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%%
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input: expr { *root = $1; }
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;
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expr: STRING {
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$$ = reinterpret_cast<Expr*>(malloc(sizeof(Expr)));
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$$->fn = Literal;
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$$->name = $1;
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$$->argc = 0;
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$$->argv = NULL;
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$$->start = @$.start;
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$$->end = @$.end;
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}
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| '(' expr ')' { $$ = $2; $$->start=@$.start; $$->end=@$.end; }
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| expr ';' { $$ = $1; $$->start=@1.start; $$->end=@1.end; }
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| expr ';' expr { $$ = Build(SequenceFn, @$, 2, $1, $3); }
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| error ';' expr { $$ = $3; $$->start=@$.start; $$->end=@$.end; }
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| expr '+' expr { $$ = Build(ConcatFn, @$, 2, $1, $3); }
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| expr EQ expr { $$ = Build(EqualityFn, @$, 2, $1, $3); }
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| expr NE expr { $$ = Build(InequalityFn, @$, 2, $1, $3); }
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| expr AND expr { $$ = Build(LogicalAndFn, @$, 2, $1, $3); }
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| expr OR expr { $$ = Build(LogicalOrFn, @$, 2, $1, $3); }
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| '!' expr { $$ = Build(LogicalNotFn, @$, 1, $2); }
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| IF expr THEN expr ENDIF { $$ = Build(IfElseFn, @$, 2, $2, $4); }
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| IF expr THEN expr ELSE expr ENDIF { $$ = Build(IfElseFn, @$, 3, $2, $4, $6); }
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| STRING '(' arglist ')' {
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$$ = reinterpret_cast<Expr*>(malloc(sizeof(Expr)));
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$$->fn = FindFunction($1);
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if ($$->fn == NULL) {
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char buffer[256];
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snprintf(buffer, sizeof(buffer), "unknown function \"%s\"", $1);
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yyerror(root, error_count, buffer);
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YYERROR;
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}
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$$->name = $1;
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$$->argc = $3.argc;
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$$->argv = $3.argv;
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$$->start = @$.start;
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$$->end = @$.end;
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}
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;
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arglist: /* empty */ {
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$$.argc = 0;
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$$.argv = NULL;
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}
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| expr {
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$$.argc = 1;
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$$.argv = reinterpret_cast<Expr**>(malloc(sizeof(Expr*)));
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$$.argv[0] = $1;
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}
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| arglist ',' expr {
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$$.argc = $1.argc + 1;
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$$.argv = reinterpret_cast<Expr**>(realloc($$.argv, $$.argc * sizeof(Expr*)));
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$$.argv[$$.argc-1] = $3;
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}
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;
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%%
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void yyerror(Expr** root, int* error_count, const char* s) {
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if (strlen(s) == 0) {
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s = "syntax error";
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}
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printf("line %d col %d: %s\n", gLine, gColumn, s);
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++*error_count;
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}
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int parse_string(const char* str, Expr** root, int* error_count) {
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yy_switch_to_buffer(yy_scan_string(str));
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return yyparse(root, error_count);
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}
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