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      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