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authorYing Wang <wangying@google.com>2016-01-12 03:14:17 +0100
committerYing Wang <wangying@google.com>2016-01-12 03:14:17 +0100
commitc8abc4ec45ae9c5310097a02a406cd663e5457ea (patch)
treee210c2265dc0c2d22ccf313a7e83a6db79136126 /edify/parser.yy
parentMerge "updater: Add a function to check first block" (diff)
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Diffstat (limited to 'edify/parser.yy')
-rw-r--r--edify/parser.yy139
1 files changed, 139 insertions, 0 deletions
diff --git a/edify/parser.yy b/edify/parser.yy
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+++ b/edify/parser.yy
@@ -0,0 +1,139 @@
+%{
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "expr.h"
+#include "yydefs.h"
+#include "parser.h"
+
+extern int gLine;
+extern int gColumn;
+
+void yyerror(Expr** root, int* error_count, const char* s);
+int yyparse(Expr** root, int* error_count);
+
+struct yy_buffer_state;
+void yy_switch_to_buffer(struct yy_buffer_state* new_buffer);
+struct yy_buffer_state* yy_scan_string(const char* yystr);
+
+%}
+
+%locations
+
+%union {
+ char* str;
+ Expr* expr;
+ struct {
+ int argc;
+ Expr** argv;
+ } args;
+}
+
+%token AND OR SUBSTR SUPERSTR EQ NE IF THEN ELSE ENDIF
+%token <str> STRING BAD
+%type <expr> expr
+%type <args> arglist
+
+%parse-param {Expr** root}
+%parse-param {int* error_count}
+%error-verbose
+
+/* declarations in increasing order of precedence */
+%left ';'
+%left ','
+%left OR
+%left AND
+%left EQ NE
+%left '+'
+%right '!'
+
+%%
+
+input: expr { *root = $1; }
+;
+
+expr: STRING {
+ $$ = reinterpret_cast<Expr*>(malloc(sizeof(Expr)));
+ $$->fn = Literal;
+ $$->name = $1;
+ $$->argc = 0;
+ $$->argv = NULL;
+ $$->start = @$.start;
+ $$->end = @$.end;
+}
+| '(' expr ')' { $$ = $2; $$->start=@$.start; $$->end=@$.end; }
+| expr ';' { $$ = $1; $$->start=@1.start; $$->end=@1.end; }
+| expr ';' expr { $$ = Build(SequenceFn, @$, 2, $1, $3); }
+| error ';' expr { $$ = $3; $$->start=@$.start; $$->end=@$.end; }
+| expr '+' expr { $$ = Build(ConcatFn, @$, 2, $1, $3); }
+| expr EQ expr { $$ = Build(EqualityFn, @$, 2, $1, $3); }
+| expr NE expr { $$ = Build(InequalityFn, @$, 2, $1, $3); }
+| expr AND expr { $$ = Build(LogicalAndFn, @$, 2, $1, $3); }
+| expr OR expr { $$ = Build(LogicalOrFn, @$, 2, $1, $3); }
+| '!' expr { $$ = Build(LogicalNotFn, @$, 1, $2); }
+| IF expr THEN expr ENDIF { $$ = Build(IfElseFn, @$, 2, $2, $4); }
+| IF expr THEN expr ELSE expr ENDIF { $$ = Build(IfElseFn, @$, 3, $2, $4, $6); }
+| STRING '(' arglist ')' {
+ $$ = reinterpret_cast<Expr*>(malloc(sizeof(Expr)));
+ $$->fn = FindFunction($1);
+ if ($$->fn == NULL) {
+ char buffer[256];
+ snprintf(buffer, sizeof(buffer), "unknown function \"%s\"", $1);
+ yyerror(root, error_count, buffer);
+ YYERROR;
+ }
+ $$->name = $1;
+ $$->argc = $3.argc;
+ $$->argv = $3.argv;
+ $$->start = @$.start;
+ $$->end = @$.end;
+}
+;
+
+arglist: /* empty */ {
+ $$.argc = 0;
+ $$.argv = NULL;
+}
+| expr {
+ $$.argc = 1;
+ $$.argv = reinterpret_cast<Expr**>(malloc(sizeof(Expr*)));
+ $$.argv[0] = $1;
+}
+| arglist ',' expr {
+ $$.argc = $1.argc + 1;
+ $$.argv = reinterpret_cast<Expr**>(realloc($$.argv, $$.argc * sizeof(Expr*)));
+ $$.argv[$$.argc-1] = $3;
+}
+;
+
+%%
+
+void yyerror(Expr** root, int* error_count, const char* s) {
+ if (strlen(s) == 0) {
+ s = "syntax error";
+ }
+ printf("line %d col %d: %s\n", gLine, gColumn, s);
+ ++*error_count;
+}
+
+int parse_string(const char* str, Expr** root, int* error_count) {
+ yy_switch_to_buffer(yy_scan_string(str));
+ return yyparse(root, error_count);
+}