contrib/src/applet/prepinclude.cpp

   1 /****************************************************************************
   2 *
   3 *                       wxWindows HTML Applet Package
   4 *
   5 *               Copyright (C) 1991-2001 SciTech Software, Inc.
   6 *                            All rights reserved.
   7 *
   8 *  ========================================================================
   9 *
  10 *    The contents of this file are subject to the wxWindows License
  11 *    Version 3.0 (the "License"); you may not use this file except in
  12 *    compliance with the License. You may obtain a copy of the License at
  13 *    http://www.wxwindows.org/licence3.txt
  14 *
  15 *    Software distributed under the License is distributed on an
  16 *    "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
  17 *    implied. See the License for the specific language governing
  18 *    rights and limitations under the License.
  19 *
  20 *  ========================================================================
  21 *
  22 * Language:             ANSI C++
  23 * Environment:  Any
  24 *
  25 * Description:  This file is the implementation of the Preprocessor object
  26 * for parsing the <!--#include
  27 *
  28 ****************************************************************************/
  29
  30 // For compilers that support precompilation
  31 #include "wx/wxprec.h"
  32 //#include "wx/file.h"
  33 #include "wx/filesys.h"
  34 // Include private headers
  35 #include "wx/applet/prepinclude.h"
  36
  37 #define RECURSE_LIMIT 50
  38 /*---------------------------- Global variables ---------------------------*/
  39
  40
  41 /*----------------------------- Implementation ----------------------------*/
  42
  43 /****************************************************************************
  44 PARAMETERS:
  45 text        - HTML to process for include directives
  46
  47 RETURNS:
  48 The string containing the processed HTML
  49
  50 REMARKS:
  51 This is the only implemented method of the Preprocessor class. It is a constant
  52 function that parses a string. Basically we load the string search for include
  53 statements then replace them with the correct file. Wash rinse and repeat until
  54 all recursive cases are handled.
  55 ****************************************************************************/
  56 wxString wxIncludePrep::Process(
  57     const wxString& text) const
  58 {
  59     int i;
  60         char ft[] = "<!--#include virtual=";
  61
  62
  63     int openedcount = 0;
  64
  65     // make a copy so we can replace text as we go without affecting the original
  66         wxString output = text;
  67         while ((i = (output.Lower()).Find(ft)) != -1) {
  68                 // This loop makes more recursion unnecessary since each iteration adds
  69                 // the new include files to output.
  70                 int n, c;
  71                 wxString fname;
  72
  73         n = (output.Mid(i+21)).Find("-->");
  74
  75                 if (n == -1) {
  76 #ifdef CHECKED
  77             wxMessageBox("wxHTML #include error: Could not read filename. Premature end of file.","Error",wxICON_ERROR);
  78 #endif
  79             break;
  80             }
  81
  82                 fname = output.Mid(i+21, n);
  83
  84                 // Clip off any quotation marks if they exist. (don't die if there arn't any)
  85                 c = fname.Find("\"");
  86         if (c != -1) fname = fname.Mid(c+1);
  87                 c = fname.Find("\"");
  88                 if (c != -1) fname = fname.Mid(0, c);
  89
  90                 // remove the #include tag
  91         output.Remove(i, n+21+3);
  92
  93         wxFSFile * file;
  94         file = m_FS->OpenFile(fname);
  95
  96         if (!file) {
  97 #ifdef CHECKED
  98                         wxMessageBox(wxString("wxHTML #include error: File not Found ") + fname + wxString("."),"Error",wxICON_ERROR);
  99 #endif
 100             delete file;
 101             continue;
 102                         }
 103
 104                 wxString tmp;
 105
 106         do {
 107                         char tmp2[257];
 108                         (file->GetStream())->Read(tmp2, 256);
 109                         c = (file->GetStream())->LastRead();
 110             tmp2[c] = 0;
 111                         tmp += wxString(tmp2);
 112                         } while (c == 256);
 113
 114                 output = (output.Mid(0,i) + tmp + output.Mid(i));
 115
 116         #ifdef CHECKED
 117         if (openedcount > RECURSE_LIMIT) {
 118             wxMessageBox(wxString("wxHTML #include error: More than RECURSE_LIMIT files have been #included you may have a file that is directly or indirectly including itself, causing an endless loop"), "Error" ,wxICON_ERROR);
 119             break;
 120             }
 121         #endif
 122
 123         openedcount++;
 124         delete file;
 125         }
 126
 127         return output;
 128 }
 129
 130 /****************************************************************************
 131 PARAMETERS:
 132 dir     - Default directory to get included HTML files from
 133
 134 REMARKS:
 135 This function sets the directory to get included HTML files from. The default
 136 value is the current directory. Directorys may be given as a relative path.
 137 ****************************************************************************/
 138 void wxIncludePrep::ChangeDirectory(
 139     wxFileSystem *fs)
 140 {
 141      m_FS = fs;
 142 }
 143