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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