lib/skin_parser/skin_scan.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2010 Robert Bieber
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include <stdio.h>
  23 #include <ctype.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26
  27 #include "skin_scan.h"
  28 #include "skin_debug.h"
  29 #include "symbols.h"
  30 #include "skin_parser.h"
  31
  32 /* Scanning Functions */
  33
  34 /* Simple function to advance a char* past a comment */
  35 void skip_comment(const char** document)
  36 {
  37     while(**document != '\n' && **document != '\0')
  38         (*document)++;
  39     if(**document == '\n')
  40         (*document)++;
  41 }
  42
  43 void skip_arglist(const char** document)
  44 {
  45     if(**document == ARGLISTOPENSYM)
  46         (*document)++;
  47     while(**document && **document != ARGLISTCLOSESYM)
  48     {
  49         if(**document == TAGSYM)
  50         {
  51             (*document)++;
  52             if(**document == '\0')
  53                 break;
  54             (*document)++;
  55         }
  56         else if(**document == ARGLISTOPENSYM)
  57             skip_arglist(document);
  58         else if(**document == ENUMLISTOPENSYM)
  59             skip_enumlist(document);
  60         else if(**document == COMMENTSYM)
  61             skip_comment(document);
  62         else
  63             (*document)++;
  64     }
  65     if(**document == ARGLISTCLOSESYM)
  66         (*document)++;
  67 }
  68
  69 void skip_enumlist(const char** document)
  70 {
  71     if(**document == ENUMLISTOPENSYM)
  72         (*document)++;
  73     while(**document && **document != ENUMLISTCLOSESYM)
  74     {
  75         if(**document == TAGSYM)
  76         {
  77             (*document)++;
  78             if(**document == '\0')
  79                 break;
  80             (*document)++;
  81         }
  82         else if(**document == ARGLISTOPENSYM)
  83             skip_arglist(document);
  84         else if(**document == ENUMLISTOPENSYM)
  85             skip_enumlist(document);
  86         else if(**document == COMMENTSYM)
  87             skip_comment(document);
  88         else
  89             (*document)++;
  90     }
  91
  92     if(**document == ENUMLISTCLOSESYM)
  93         (*document)++;
  94 }
  95
  96 char* scan_string(const char** document)
  97 {
  98
  99     const char* cursor = *document;
 100     int length = 0;
 101     char* buffer = NULL;
 102     int i;
 103
 104     while(*cursor != ARGLISTSEPARATESYM && *cursor != ARGLISTCLOSESYM &&
 105           *cursor != '\0')
 106     {
 107         if(*cursor == COMMENTSYM)
 108         {
 109             skip_comment(&cursor);
 110             continue;
 111         }
 112
 113         if(*cursor == TAGSYM)
 114             cursor++;
 115
 116         if(*cursor == '\n')
 117         {
 118             skin_error(UNEXPECTED_NEWLINE, cursor);
 119             return NULL;
 120         }
 121
 122         length++;
 123         cursor++;
 124     }
 125
 126     /* Copying the string */
 127     cursor = *document;
 128     buffer = skin_alloc_string(length);
 129     if (!buffer)
 130         return NULL;
 131     buffer[length] = '\0';
 132     for(i = 0; i < length; i++)
 133     {
 134         if(*cursor == TAGSYM)
 135             cursor++;
 136
 137         if(*cursor == COMMENTSYM)
 138         {
 139             skip_comment(&cursor);
 140             i--;
 141             continue;
 142         }
 143
 144         buffer[i] = *cursor;
 145         cursor++;
 146     }
 147
 148     *document = cursor;
 149     return buffer;
 150 }
 151
 152 int scan_int(const char** document)
 153 {
 154
 155     const char *cursor = *document, *end;
 156     int length = 0;
 157     char buffer[16];
 158     int retval;
 159     int i;
 160
 161     while(isdigit(*cursor) || *cursor == COMMENTSYM || *cursor == '-')
 162     {
 163         if(*cursor == COMMENTSYM)
 164         {
 165             skip_comment(&cursor);
 166             continue;
 167         }
 168
 169         length++;
 170         cursor++;
 171     }
 172     if (length > 15)
 173         length = 15;
 174     end = cursor;
 175     /* Copying to the buffer while avoiding comments */
 176     cursor = *document;
 177     buffer[length] = '\0';
 178     for(i = 0; i < length; i++)
 179     {
 180         if(*cursor == COMMENTSYM)
 181         {
 182             skip_comment(&cursor);
 183             i--;
 184             continue;
 185         }
 186
 187         buffer[i] = *cursor;
 188         cursor++;
 189
 190     }
 191     retval = atoi(buffer);
 192
 193     *document = end;
 194     return retval;
 195 }
 196
 197 int check_viewport(const char* document)
 198 {
 199     if(strlen(document) < 3)
 200         return 0;
 201
 202     if(document[0] != TAGSYM)
 203         return 0;
 204
 205     if(document[1] != 'V')
 206         return 0;
 207
 208     if(document[2] != ARGLISTOPENSYM
 209        && document[2] != 'l'
 210        && document[2] != 'i')
 211         return 0;
 212
 213     return 1;
 214 }