145 lines
4 KiB
Text
145 lines
4 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 <stdarg.h>
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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 <memory>
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#include <string>
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#include <vector>
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#include <android-base/macros.h>
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#include "edify/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(std::unique_ptr<Expr>* root, int* error_count, const char* s);
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int yyparse(std::unique_ptr<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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// Convenience function for building expressions with a fixed number
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// of arguments.
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static Expr* Build(Function fn, YYLTYPE loc, size_t count, ...) {
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va_list v;
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va_start(v, count);
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Expr* e = new Expr(fn, "(operator)", loc.start, loc.end);
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for (size_t i = 0; i < count; ++i) {
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e->argv.emplace_back(va_arg(v, Expr*));
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}
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va_end(v);
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return e;
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}
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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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std::vector<std::unique_ptr<Expr>>* 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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%destructor { delete $$; } expr
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%destructor { delete $$; } arglist
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%parse-param {std::unique_ptr<Expr>* root}
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%parse-param {int* error_count}
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%define parse.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->reset($1); }
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;
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expr: STRING {
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$$ = new Expr(Literal, $1, @$.start, @$.end);
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}
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| '(' expr ')' { $$ = $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 { $$ = Build(IfElseFn, @$, 3, $2, $4, $6); }
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| STRING '(' arglist ')' {
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Function fn = FindFunction($1);
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if (fn == nullptr) {
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std::string msg = "unknown function \"" + std::string($1) + "\"";
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yyerror(root, error_count, msg.c_str());
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YYERROR;
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}
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$$ = new Expr(fn, $1, @$.start, @$.end);
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$$->argv = std::move(*$3);
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}
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;
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arglist: /* empty */ {
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$$ = new std::vector<std::unique_ptr<Expr>>;
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}
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| expr {
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$$ = new std::vector<std::unique_ptr<Expr>>;
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$$->emplace_back($1);
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}
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| arglist ',' expr {
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UNUSED($1);
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$$->push_back(std::unique_ptr<Expr>($3));
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}
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;
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%%
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void yyerror(std::unique_ptr<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 ParseString(const std::string& str, std::unique_ptr<Expr>* root, int* error_count) {
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yy_switch_to_buffer(yy_scan_string(str.c_str()));
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return yyparse(root, error_count);
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}
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