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gecko-dev/grendel/mime/html/TextHTMLConverter.java

270 строки
9.0 KiB
Java
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/* -*- Mode: java; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* The Original Code is the Grendel mail/news client.
*
* The Initial Developer of the Original Code is Netscape Communications
* Corporation. Portions created by Netscape are Copyright (C) 1997
* Netscape Communications Corporation. All Rights Reserved.
*
* Created: Jamie Zawinski <jwz@netscape.com>, 31 Aug 1997.
*
* Contributors: Edwin Woudt <edwin@woudt.nl>
*/
package grendel.mime.html;
/** This class knows how to convert plain-text to HTML.
*/
class TextHTMLConverter {
/** Given a StringBuffer of text, alters that text in place to be displayable
as HTML: the <, >, and & characters are converted to entities.
@arg urls_too If this argument is true, then any text in the
buffer that looks like a URL will have a link
wrapped around it pointing at that URL.
@arg citations_too If this argument is true, then if the line begins
with Usenet-style citation marks, it will be
wrapped in <CITE> </CITE> tags.
For either `urls_too' or `citations_too' to work,
the buffer must contain exactly one line of text.
If both of these arguments are false, the buffer
may fall on any boundary.
*/
public static void quoteForHTML(StringBuffer text, boolean urls_too,
boolean citations_too) {
int in_length = text.length();
for (int i = 0; i < in_length; i++) {
char c = text.charAt(i);
if (c == '<') {
text.setCharAt(i, '&');
text.insert(i+1, "lt;");
in_length += 3;
i += 3;
} else if (c == '&') {
text.setCharAt(i, '&');
text.insert(i+1, "amp;");
in_length += 4;
i += 4;
} else if (urls_too) {
if (c > ' ' &&
(i == 0 ||
!Character.isLetterOrDigit((char) text.charAt(i-1))) &&
isURLProtocol(text, i, in_length)) {
int end;
// found a URL protocol. Now find the end of the URL.
for (end = i; end < in_length; end++) {
// These characters always mark the end of the URL.
if (text.charAt(end) <= ' ' ||
text.charAt(end) == '<' || text.charAt(end) == '>' ||
text.charAt(end) == '`' || text.charAt(end) == ')' ||
text.charAt(end) == '\'' || text.charAt(end) == '"' ||
text.charAt(end) == ']' || text.charAt(end) == '}')
break;
}
// Check for certain punctuation characters on the end, and strip
// them off.
while (end > i &&
(text.charAt(end-1) == '.' || text.charAt(end-1) == ',' ||
text.charAt(end-1) == '!' || text.charAt(end-1) == ';' ||
text.charAt(end-1) == '-' || text.charAt(end-1) == '?' ||
text.charAt(end-1) == '#'))
end--;
// if the url is less than 7 characters then we screwed up and got a
// "news:" url or something which is worthless to us. Exclude the A
// tag in this case.
//
// Also exclude any URL that ends in a colon; those tend to be
// internal and magic and uninteresting.
//
if ((end-i) > 7 &&
text.charAt(end-1) != ':') {
// extract the URL
int url_length = end-i;
char url[] = new char[url_length];
text.getChars(i, end, url, 0);
text.insert(i, "<A HREF=\"");
i += 9;
end += 9;
in_length += 9;
i = end-1;
text.insert(i+1, "\">");
i += 2;
in_length += 2;
text.insert(i+1, url);
in_length += url_length;
i++;
end = i + url_length;
while (i < end) {
c = text.charAt(i);
if (c == '<') {
text.setCharAt(i, '&');
text.insert(i+1, "lt;");
in_length += 3;
end += 3;
i += 3;
} else if (c == '&') {
text.setCharAt(i, '&');
text.insert(i+1, "amp;");
in_length += 4;
end += 4;
i += 4;
}
i++;
}
text.insert(i, "</A>");
i += 4;
in_length += 4;
} else {
// move to the end of this URL for our next trip through the loop.
i = end-1;
}
}
}
}
if (citations_too) {
// Decide whether this line is a quotation, and should be italicized.
// This implements the following case-sensitive regular expression:
//
// ^[ \t]*[A-Z]*[]>]
//
// Which matches these lines:
//
// > blah blah blah
// > blah blah blah
// LOSER> blah blah blah
// LOSER] blah blah blah
//
int i;
// skip over whitespace
for (i = 0; i < in_length; i++)
if (text.charAt(i) > ' ') break;
// skip over ASCII uppercase letters
for (; i < in_length; i++)
if (text.charAt(i) < 'A' || text.charAt(i) > 'Z') break;
if (i < in_length &&
(text.charAt(i) == '>' || text.charAt(i) == ']') &&
!sendmailFuckage(text, i, in_length)) {
text.insert(i, "<CITE>");
in_length += 6;
text.insert(in_length, "</CITE><br>");
}
}
}
private final static boolean isURLProtocol(StringBuffer buf,
int start, int length) {
switch(buf.charAt(start)) {
case 'a': case 'A':
return matchSubstring(buf, start, length, "about:");
case 'f': case 'F':
return (matchSubstring(buf, start, length, "ftp:") ||
matchSubstring(buf, start, length, "file:"));
case 'g': case 'G':
return matchSubstring(buf, start, length, "gopher:");
case 'h': case 'H':
return (matchSubstring(buf, start, length, "http:") ||
matchSubstring(buf, start, length, "https:"));
case 'm': case 'M':
return (matchSubstring(buf, start, length, "mailto:") ||
matchSubstring(buf, start, length, "mailbox:"));
case 'n': case 'N':
return matchSubstring(buf, start, length, "news:");
case 'r': case 'R':
return matchSubstring(buf, start, length, "rlogin:");
case 's': case 'S':
return matchSubstring(buf, start, length, "snews:");
case 't': case 'T':
return (matchSubstring(buf, start, length, "telnet:") ||
matchSubstring(buf, start, length, "tn3270:"));
case 'w': case 'W':
return matchSubstring(buf, start, length, "wais:");
case 'u': case 'U':
return matchSubstring(buf, start, length, "urn:");
default:
return false;
}
}
private final static boolean matchSubstring(StringBuffer buf, int start,
int length, String string) {
int L = string.length();
if (length - start <= L) return false;
for (int i = 0; i < L; i++) {
if (Character.toLowerCase(string.charAt(i)) !=
Character.toLowerCase(buf.charAt(start+i)))
return false;
}
return true;
}
private final static boolean sendmailFuckage(StringBuffer buf,
int start, int length) {
return ((length - start) > 5 &&
buf.charAt(start ) == '>' &&
buf.charAt(start+1) == 'F' &&
buf.charAt(start+2) == 'r' &&
buf.charAt(start+3) == 'o' &&
buf.charAt(start+4) == 'm' &&
buf.charAt(start+5) == ' ');
}
static void test(String x) {
System.out.println("Testing: " + x);
StringBuffer buf = new StringBuffer(x);
quoteForHTML(buf, true, false);
System.out.println(" " + buf.toString());
}
public static void main(String args[]) {
test("foobar");
test("<foobar>");
test("gabba gabba <hey>");
test("this is not http: a url");
test("this is not hxxp:adssfafsa a url");
test("this is http:adssfafsa a url");
test("this is mailto: a url");
test("this is mailto:jwz a url");
test("this is ABOUT:JWZ?LOSSAGE=SPECTACULAR a url");
test("this is ABOUT:JWZ?LOSSAGE=SPECTACULAR&egregious=very. a url");
test("http://somewhere/fbi.cgi?huzza=&lt;zorch&gt;");
test("---http://somewhere/fbi.cgi?huzza=&lt;zorch&gt;...");
}
}
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