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