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 <string.h>
19 
20 #include "expr.h"
21 #include "yydefs.h"
22 #include "parser.h"
23 
24 int gLine = 1;
25 int gColumn = 1;
26 int gPos = 0;
27 
28 // TODO: enforce MAX_STRING_LEN during lexing
29 char string_buffer[MAX_STRING_LEN];
30 char* string_pos;
31 
32 #define ADVANCE do {yylloc.start=gPos; yylloc.end=gPos+yyleng; \
33                     gColumn+=yyleng; gPos+=yyleng;} while(0)
34 
35 %}
36 
37 %x STR
38 
39 %option noyywrap
40 
41 %%
42 
43 
44 \" {
45     BEGIN(STR);
46     string_pos = string_buffer;
47     yylloc.start = gPos;
48     ++gColumn;
49     ++gPos;
50 }
51 
52 <STR>{
53   \" {
54       ++gColumn;
55       ++gPos;
56       BEGIN(INITIAL);
57       *string_pos = '\0';
58       yylval.str = strdup(string_buffer);
59       yylloc.end = gPos;
60       return STRING;
61   }
62 
63   \\n   { gColumn += yyleng; gPos += yyleng; *string_pos++ = '\n'; }
64   \\t   { gColumn += yyleng; gPos += yyleng;  *string_pos++ = '\t'; }
65   \\\"  { gColumn += yyleng; gPos += yyleng;  *string_pos++ = '\"'; }
66   \\\\  { gColumn += yyleng; gPos += yyleng;  *string_pos++ = '\\'; }
67 
68   \\x[0-9a-fA-F]{2} {
69       gColumn += yyleng;
70       gPos += yyleng;
71       int val;
72       sscanf(yytext+2, "%x", &val);
73       *string_pos++ = val;
74   }
75 
76   \n {
77       ++gLine;
78       ++gPos;
79       gColumn = 1;
80       *string_pos++ = yytext[0];
81   }
82 
83   . {
84       ++gColumn;
85       ++gPos;
86       *string_pos++ = yytext[0];
87   }
88 }
89 
90 if                ADVANCE; return IF;
91 then              ADVANCE; return THEN;
92 else              ADVANCE; return ELSE;
93 endif             ADVANCE; return ENDIF;
94 
95 [a-zA-Z0-9_:/.]+ {
96   ADVANCE;
97   yylval.str = strdup(yytext);
98   return STRING;
99 }
100 
101 \&\&              ADVANCE; return AND;
102 \|\|              ADVANCE; return OR;
103 ==                ADVANCE; return EQ;
104 !=                ADVANCE; return NE;
105 
106 [+(),!;]          ADVANCE; return yytext[0];
107 
108 [ \t]+            ADVANCE;
109 
110 (#.*)?\n          gPos += yyleng; ++gLine; gColumn = 1;
111 
112 .                 return BAD;
113