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authorYing Wang2016-01-11 20:14:17 -0600
committerYing Wang2016-01-12 23:09:10 -0600
commitc577660702c5649fdcb38b1828c1d6a2bd02772c (patch)
tree915e1635edb04470b5a493538a4287011e41d712 /edify/parser.yy
parentb1cc5d8434c0216a1d7174d18c53054e46a51f76 (diff)
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Rename .l/.y to .ll/.yy
Now to generate .cpp you need to use .ll/.yy. Bug: 26492989 Change-Id: Ib078e03b3b0758f7a62595c343e52ae856bcb33f
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
new file mode 100644
index 00000000..098a6370
--- /dev/null
+++ b/edify/parser.yy
@@ -0,0 +1,139 @@
1%{
2/*
3 * Copyright (C) 2009 The Android Open Source Project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18#include <stdio.h>
19#include <stdlib.h>
20#include <string.h>
21
22#include "expr.h"
23#include "yydefs.h"
24#include "parser.h"
25
26extern int gLine;
27extern int gColumn;
28
29void yyerror(Expr** root, int* error_count, const char* s);
30int yyparse(Expr** root, int* error_count);
31
32struct yy_buffer_state;
33void yy_switch_to_buffer(struct yy_buffer_state* new_buffer);
34struct yy_buffer_state* yy_scan_string(const char* yystr);
35
36%}
37
38%locations
39
40%union {
41 char* str;
42 Expr* expr;
43 struct {
44 int argc;
45 Expr** argv;
46 } args;
47}
48
49%token AND OR SUBSTR SUPERSTR EQ NE IF THEN ELSE ENDIF
50%token <str> STRING BAD
51%type <expr> expr
52%type <args> arglist
53
54%parse-param {Expr** root}
55%parse-param {int* error_count}
56%error-verbose
57
58/* declarations in increasing order of precedence */
59%left ';'
60%left ','
61%left OR
62%left AND
63%left EQ NE
64%left '+'
65%right '!'
66
67%%
68
69input: expr { *root = $1; }
70;
71
72expr: STRING {
73 $$ = reinterpret_cast<Expr*>(malloc(sizeof(Expr)));
74 $$->fn = Literal;
75 $$->name = $1;
76 $$->argc = 0;
77 $$->argv = NULL;
78 $$->start = @$.start;
79 $$->end = @$.end;
80}
81| '(' expr ')' { $$ = $2; $$->start=@$.start; $$->end=@$.end; }
82| expr ';' { $$ = $1; $$->start=@1.start; $$->end=@1.end; }
83| expr ';' expr { $$ = Build(SequenceFn, @$, 2, $1, $3); }
84| error ';' expr { $$ = $3; $$->start=@$.start; $$->end=@$.end; }
85| expr '+' expr { $$ = Build(ConcatFn, @$, 2, $1, $3); }
86| expr EQ expr { $$ = Build(EqualityFn, @$, 2, $1, $3); }
87| expr NE expr { $$ = Build(InequalityFn, @$, 2, $1, $3); }
88| expr AND expr { $$ = Build(LogicalAndFn, @$, 2, $1, $3); }
89| expr OR expr { $$ = Build(LogicalOrFn, @$, 2, $1, $3); }
90| '!' expr { $$ = Build(LogicalNotFn, @$, 1, $2); }
91| IF expr THEN expr ENDIF { $$ = Build(IfElseFn, @$, 2, $2, $4); }
92| IF expr THEN expr ELSE expr ENDIF { $$ = Build(IfElseFn, @$, 3, $2, $4, $6); }
93| STRING '(' arglist ')' {
94 $$ = reinterpret_cast<Expr*>(malloc(sizeof(Expr)));
95 $$->fn = FindFunction($1);
96 if ($$->fn == NULL) {
97 char buffer[256];
98 snprintf(buffer, sizeof(buffer), "unknown function \"%s\"", $1);
99 yyerror(root, error_count, buffer);
100 YYERROR;
101 }
102 $$->name = $1;
103 $$->argc = $3.argc;
104 $$->argv = $3.argv;
105 $$->start = @$.start;
106 $$->end = @$.end;
107}
108;
109
110arglist: /* empty */ {
111 $$.argc = 0;
112 $$.argv = NULL;
113}
114| expr {
115 $$.argc = 1;
116 $$.argv = reinterpret_cast<Expr**>(malloc(sizeof(Expr*)));
117 $$.argv[0] = $1;
118}
119| arglist ',' expr {
120 $$.argc = $1.argc + 1;
121 $$.argv = reinterpret_cast<Expr**>(realloc($$.argv, $$.argc * sizeof(Expr*)));
122 $$.argv[$$.argc-1] = $3;
123}
124;
125
126%%
127
128void yyerror(Expr** root, int* error_count, const char* s) {
129 if (strlen(s) == 0) {
130 s = "syntax error";
131 }
132 printf("line %d col %d: %s\n", gLine, gColumn, s);
133 ++*error_count;
134}
135
136int parse_string(const char* str, Expr** root, int* error_count) {
137 yy_switch_to_buffer(yy_scan_string(str));
138 return yyparse(root, error_count);
139}