37bee62aef
Edify is a simple scripting language for OTA installation, to be used when we move to OTAs being installed via binaries shipped with the package.
122 lines
3.0 KiB
Plaintext
122 lines
3.0 KiB
Plaintext
%{
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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 "parser.h"
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extern int gLine;
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extern int gColumn;
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void yyerror(Expr** root, const char* s);
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int yyparse(Expr** root);
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%}
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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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%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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$$ = malloc(sizeof(Expr));
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$$->fn = Literal;
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$$->name = $1;
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$$->argc = 0;
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$$->argv = NULL;
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}
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| '(' expr ')' { $$ = $2; }
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| expr ';' { $$ = $1; }
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| expr ';' expr { $$ = Build(SequenceFn, 2, $1, $3); }
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| error ';' expr { $$ = $3; }
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| expr '+' expr { $$ = 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 { $$ = Build(IfElseFn, 3, $2, $4, $6); }
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| STRING '(' arglist ')' {
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$$ = 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, 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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$$->argv = $3.argv;
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}
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;
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arglist: /* empty */ {
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$$.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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$$.argv = malloc(sizeof(Expr*));
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$$.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 = 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, 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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}
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