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112 lines
4.0 KiB
112 lines
4.0 KiB
/*
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XOWA: the XOWA Offline Wiki Application
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Copyright (C) 2012-2020 gnosygnu@gmail.com
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XOWA is licensed under the terms of the General Public License (GPL) Version 3,
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or alternatively under the terms of the Apache License Version 2.0.
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You may use XOWA according to either of these licenses as is most appropriate
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for your project on a case-by-case basis.
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The terms of each license can be found in the source code repository:
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GPLv3 License: https://github.com/gnosygnu/xowa/blob/master/LICENSE-GPLv3.txt
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Apache License: https://github.com/gnosygnu/xowa/blob/master/LICENSE-APACHE2.txt
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*/
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package gplx.xowa.xtns.template_styles;
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import gplx.Bry_;
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import gplx.String_;
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import gplx.langs.javascripts.util.regex.JsPattern_;
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import gplx.xowa.htmls.minifys.XoCssMin;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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public class XoCssTransformer {
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private final static ConcurrentHashMap<String, Pattern> patterns = new ConcurrentHashMap<>();
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private String css;
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public XoCssTransformer(String css) {
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this.css = css;
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}
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public XoCssTransformer Minify() {
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XoCssMin minifier = new XoCssMin();
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this.css = minifier.cssmin(css, -1);
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return this;
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}
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public XoCssTransformer Url(String src, String trg) {
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// change some url(...) entries
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css = css.replace("//" + src, "//" + trg);
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return this;
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}
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public XoCssTransformer Prepend(String selector) {
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// prepend any classes to all declarations; primarily for '.mw-parser-output ' selector
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// regex means match anything before `{` which is not `}{`
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css = PrependSelector(css, "([^\\}\\{]*)\\{", selector);
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return this;
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}
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public byte[] ToBry() {return Bry_.new_u8(css);}
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public String ToStr() {return css;}
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private String PrependSelector(String orig, String regx, String selector) {
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// init regex
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Pattern pattern = JsPattern_.getOrCompile(patterns, regx);
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Matcher matcher = pattern.matcher(orig);
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// init temp variables for replacements
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StringBuffer sb = null;
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int previous = 0;
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// find "match" which is everything before `{`
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while (matcher.find()) {
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// lazy-instantiate buffer
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if (sb == null) sb = new StringBuffer();
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// add everything between previousPosition and match.start
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sb.append(orig, previous, matcher.start(1));
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// get match, as well as trimmed version; need `.Trim()` to check for things like "\s@media"
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String match = matcher.group(1);
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String matchTrimmed = match.trim();
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if (matchTrimmed.length() > 0) { // should not happen b/c CSS shouldn't have "empty" class (`}{}`) but check anyway b/c of `match.charAt(0)`
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if (matchTrimmed.charAt(0) != '@') { // ignore any css conditional group rules (`@`) rules like @media, @supports, etc
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// split match by nested class selectors; EX: "a,b" -> ["a", "b"]
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String[] items = match.split(",");
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for (int i = 0; i < items.length; i++) {
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// put `,` back between items, unless it's the first
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if (i > 0)
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sb.append(",");
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String item = items[i].trim();
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if (item.length() > 0) { // ignore empty items
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// prepend the selector, except if it starts with 'body'
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if (!String_.MidByLenSafe(item, 0, 4).equals("body")) {
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sb.append(selector);
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sb.append(' ');
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}
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// put back the item
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sb.append(item);
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}
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}
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}
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else {
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// EX: `@media`
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sb.append(match);
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}
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}
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previous = matcher.end(1);
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}
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// finish generating string, or return orig
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if (sb != null) {
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sb.append(orig, previous, orig.length());
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return sb.toString();
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}
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else
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return orig;
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}
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}
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