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 // Include private headers
  31 #include "wx/applet/prepinclude.h"
  32 #include "wx/applet/echovar.h"
  33
  34 // wxWindows
  35 #include "wx/filesys.h"
  36 #include "wx/msgdlg.h"
  37
  38 /*----------------------------- Implementation ----------------------------*/
  39
  40 #define RECURSE_LIMIT 50
  41
  42 /****************************************************************************
  43 PARAMETERS:
  44 text        - text to process for echo variables
  45
  46 RETURNS:
  47 The string containing the processed filename
  48
  49 REMARKS:
  50 This routine searches through the text of the filename for variables contained
  51 in % percent signs
  52 ****************************************************************************/
  53 wxString ParseFilename(
  54     wxString &text)
  55 {
  56     int f = 0;
  57     int e;
  58     while ((f = text.find('%', f)) != wxString::npos) {
  59         f++;
  60         e = text.find('%', f);
  61 #ifdef CHECKED
  62         if (e == wxString::npos) {
  63             wxMessageBox(wxString("wxHTML #include error: % signs should bracket variable names in file attribute. To use a percent sign in a filename write double percents (%%)."), "Error" ,wxICON_ERROR);
  64             return text;
  65             }
  66 #endif
  67         if (e == f)
  68             text.replace(f-1, 2, "%");
  69         else {
  70             wxString varname = text.Mid(f, (e-f));
  71             text.replace(f-1, (e-f)+2, wxEchoVariable::GetValue(varname));
  72             }
  73         }
  74     return text;
  75 }
  76
  77 /****************************************************************************
  78 PARAMETERS:
  79 text        - HTML to process for include directives
  80
  81 RETURNS:
  82 The string containing the processed HTML
  83
  84 REMARKS:
  85 This is the only implemented method of the Preprocessor class. It is a constant
  86 function that parses a string. Basically we load the string search for include
  87 statements then replace them with the correct file. Wash rinse and repeat until
  88 all recursive cases are handled.
  89 ****************************************************************************/
  90 wxString wxIncludePrep::Process(
  91     const wxString& text) const
  92 {
  93     int i;
  94         char ft[] = "<!--#include virtual=";
  95     int openedcount = 0;
  96
  97     // make a copy so we can replace text as we go without affecting the original
  98         wxString output = text;
  99         while ((i = (output.Lower()).Find(ft)) != -1) {
 100                 // This loop makes more recursion unnecessary since each iteration adds
 101                 // the new include files to output.
 102                 int n, c;
 103                 wxString fname;
 104
 105         n = (output.Mid(i+21)).Find("-->");
 106
 107                 if (n == -1) {
 108 #ifdef CHECKED
 109             wxMessageBox("wxHTML #include error: Could not read filename. Premature end of file.","Error",wxICON_ERROR);
 110 #endif
 111             break;
 112             }
 113
 114                 fname = output.Mid(i+21, n);
 115
 116                 // Clip off any quotation marks if they exist. (don't die if there arn't any)
 117                 c = fname.Find("\"");
 118         if (c != -1) fname = fname.Mid(c+1);
 119                 c = fname.Find("\"");
 120                 if (c != -1) fname = fname.Mid(0, c);
 121
 122                 // remove the #include tag
 123         output.Remove(i, n+21+3);
 124
 125         wxFSFile * file;
 126         file = m_FS->OpenFile(ParseFilename(fname));
 127
 128         if (!file) {
 129 #ifdef CHECKED
 130                         wxMessageBox(wxString("wxHTML #include error: File not Found ") + fname + wxString("."),"Error",wxICON_ERROR);
 131 #endif
 132             delete file;
 133             continue;
 134                         }
 135
 136                 wxString tmp;
 137
 138         do {
 139                         char tmp2[257];
 140                         (file->GetStream())->Read(tmp2, 256);
 141                         c = (file->GetStream())->LastRead();
 142             tmp2[c] = 0;
 143                         tmp += wxString(tmp2);
 144                         } while (c == 256);
 145
 146                 output = (output.Mid(0,i) + tmp + output.Mid(i));
 147 #ifdef CHECKED
 148         if (openedcount > RECURSE_LIMIT) {
 149             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);
 150             break;
 151             }
 152 #endif
 153         openedcount++;
 154         delete file;
 155         }
 156
 157         return output;
 158 }
 159
 160 /****************************************************************************
 161 PARAMETERS:
 162 dir     - Default directory to get included HTML files from
 163
 164 REMARKS:
 165 This function sets the directory to get included HTML files from. The default
 166 value is the current directory. Directorys may be given as a relative path.
 167 ****************************************************************************/
 168 void wxIncludePrep::ChangeDirectory(
 169     wxFileSystem *fs)
 170 {
 171      m_FS = fs;
 172 }
 173