contrib/src/applet/prepecho.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 <!--#echo directive
  27 *
  28 ****************************************************************************/
  29
  30 // Include private headers
  31 #include "wx/applet/prepecho.h"
  32 #include "wx/applet/echovar.h"
  33
  34 // Force Link macro
  35 #include "wx/html/forcelnk.h"
  36
  37 // wxWindows headers
  38 #include "wx/msgdlg.h"
  39
  40 /*----------------------------- Implementation ----------------------------*/
  41
  42 /****************************************************************************
  43 PARAMETERS:
  44 text        - HTML to process for echo directives
  45
  46 RETURNS:
  47 The string containing the processed HTML
  48
  49 REMARKS:
  50 This function replaces #echo directives with a variable retrieved from the
  51 class given in the HTML directive. These classes are created by making a sub
  52 class of wxEchoVariable. Dynamic class construction is used at run time
  53 internally to create an instance of this class and access the value of the
  54 variable.
  55
  56 SEE ALSO:
  57 wxEchoVariable
  58 ****************************************************************************/
  59 wxString wxEchoPrep::Process(
  60     const wxString& text) const
  61 {
  62         int i;
  63         char ft[] = "<!--#echo ";
  64
  65         // make a copy so we can replace text as we go without affecting the original
  66         wxString output = text;
  67
  68         while ((i = (output.Lower()).Find(ft)) != -1) {
  69                 // Loop until every #echo directive is found
  70                 int n, c, end;
  71         wxString cname, parms;
  72         wxString tag;
  73
  74         // grab the tag and remove it from the file
  75         end = (output.Mid(i)).Find("-->");
  76         if (end == -1) {
  77 #ifdef CHECKED
  78             wxMessageBox("wxHTML #echo error: Premature end of file while parsing #echo.","Error",wxICON_ERROR);
  79 #endif
  80             break;
  81                         }
  82
  83         end += 3;
  84         tag = output.Mid(i, end);
  85         output.Remove(i, end);
  86
  87         n = (tag.Lower()).Find(" parm=");
  88         c = tag.Find("-->");
  89         if (n == -1) {
  90             n = c;
  91             // find the classname
  92             c = (tag.Mid(10, n-10)).Find(" ");
  93                 if (c == -1) n -= 10;
  94             else n = c;
  95             cname = tag.Mid(10, n);
  96
  97             // grab the value from the class, put it in tag since the data is no longer needed
  98             tag = wxEchoVariable::GetValue(cname, NULL);
  99             }
 100         else {
 101             // Find the parms
 102             parms = tag.Mid(n+6, c-n-6);
 103                 // Clip off any quotation marks if they exist. (don't die if there arn't any)
 104                 c = parms.Find("\"");
 105             if (c != -1) parms = parms.Mid(c+1);
 106                 c = parms.Find("\"");
 107                 if (c != -1) parms = parms.Mid(0, c);
 108             // find the classname
 109             c = (tag.Mid(10, n-10)).Find(" ");
 110                 if (c == -1) n -= 10;
 111             else n = c;
 112             cname = tag.Mid(10, n);
 113
 114             // grab the value from the class, put it in tag since the data is no longer needed
 115             tag = wxEchoVariable::GetValue(cname, parms.c_str());
 116             }
 117         // remove ampersands and <> chars
 118         tag.Replace("&", "&amp;");
 119         tag.Replace("<", "&lt;");
 120         tag.Replace(">", "&gt;");
 121
 122         output = (output.Mid(0,i) + tag + output.Mid(i));
 123                 }
 124     return output;
 125 }
 126
 127 FORCE_LINK(echovar)
 128