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up to date with the JS version (strings and comments preservation jazz)
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@stoyan
stoyan committed May 11, 2010
1 parent e7ac76c commit 87d7e4b
Showing 1 changed file with 63 additions and 43 deletions.
106 changes: 63 additions & 43 deletions src/com/yahoo/platform/yui/compressor/CssCompressor.java
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Original file line number Diff line number Diff line change
Expand Up @@ -34,64 +34,84 @@ public void compress(Writer out, int linebreakpos)

Pattern p;
Matcher m;
String css, token;
StringBuffer sb;
int startIndex, endIndex;
ArrayList preservedTokens;
String css = srcsb.toString();
StringBuffer sb = new StringBuffer(css);

int startIndex = 0;
int endIndex = 0;
int i = 0;
int max = 0;
ArrayList preservedTokens = new ArrayList(0);
ArrayList comments = new ArrayList(0);
String token;
int totallen = css.length();


// collect all comment blocks...
while ((startIndex = sb.indexOf("/*", startIndex)) >= 0) {
endIndex = sb.indexOf("*/", startIndex + 2);
if (endIndex < 0) {
endIndex = totallen;
}

token = sb.substring(startIndex + 2, endIndex);
comments.add(token);
sb.replace(startIndex + 2, endIndex, "___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + (comments.size() - 1) + "___");
startIndex += 2;
}
css = sb.toString();

// preserve strings so their content doesn't get accidentally minified
preservedTokens = new ArrayList(0);
css = srcsb.toString();
sb = new StringBuffer();
p = Pattern.compile("(\"([^\\\\\"]|\\\\.|\\\\)*\")|(\'([^\\\\\']|\\\\.|\\\\)*\')");
m = p.matcher(css);
while (m.find()) {
token = m.group();
char quote = token.charAt(0);
token = token.substring(1, token.length() - 1);

// maybe the string contains a comment-like substring?
// one, maybe more? put'em back then
if (token.indexOf("___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_") >= 0) {
for (i = 0, max = comments.size(); i < max; i += 1) {
token = token.replace("___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + i + "___", comments.get(i).toString());
}
}

preservedTokens.add(token);
String preserver = quote + "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___" + quote;
m.appendReplacement(sb, preserver);
}
m.appendTail(sb);
css = sb.toString();

// Remove all comment blocks...
startIndex = 0;
boolean iemac = false;
boolean preserve = false;
while ((startIndex = sb.indexOf("/*", startIndex)) >= 0) {
preserve = sb.length() > startIndex + 2 && sb.charAt(startIndex + 2) == '!';
endIndex = sb.indexOf("*/", startIndex + 2);
if (endIndex < 0) {
if (!preserve) {
sb.delete(startIndex, sb.length());
}
} else if (endIndex >= startIndex + 2) {
if (sb.charAt(endIndex-1) == '\\') {
// Looks like a comment to hide rules from IE Mac.
// Leave this comment, and the following one, but shorten them.
sb.replace(startIndex, endIndex + 2, "/*\\*/");
startIndex += 5;
iemac = true;
} else if (iemac && !preserve) {
sb.replace(startIndex, endIndex + 2, "/**/");
startIndex += 4;
iemac = false;
} else if (!preserve) {
sb.delete(startIndex, endIndex + 2);
} else {
// preserve
token = sb.substring(startIndex + 3, endIndex); // 3 is "/*!".length
preservedTokens.add(token);
token = "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___";
sb.replace(startIndex + 2, endIndex, token);
if (iemac) iemac = false;
startIndex += 2;
}

// strings are safe, now wrestle the comments
for (i = 0, max = comments.size(); i < max; i += 1) {

token = comments.get(i).toString();

// ! in the first position of the comment means preserve
// so push to the preserved tokens while stripping the !
if (token.startsWith("!")) {
preservedTokens.add(token.substring(1));
css = css.replace("___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + i + "___", "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___");
continue;
}
// \ in the last position looks like hack for Mac/IE5
// shorten that to /*\*/ and the next one to /**/
if (token.endsWith("\\")) {
preservedTokens.add("\\");
css = css.replace("___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + i + "___", "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___");
i = i + 1; // attn: advancing the loop
preservedTokens.add("");
css = css.replace("___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + i + "___", "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.size() - 1) + "___");
continue;
}
// in all other cases kill the comment
css = css.replace("/*___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + i + "___*/", "");
}

css = sb.toString();

// Normalize all whitespace strings to single spaces. Easier to work with that way.
css = css.replaceAll("\\s+", " ");
Expand Down Expand Up @@ -155,7 +175,7 @@ public void compress(Writer out, int linebreakpos)
while (m.find()) {
String[] rgbcolors = m.group(1).split(",");
StringBuffer hexcolor = new StringBuffer("#");
for (int i = 0; i < rgbcolors.length; i++) {
for (i = 0; i < rgbcolors.length; i++) {
int val = Integer.parseInt(rgbcolors[i]);
if (val < 16) {
hexcolor.append("0");
Expand Down Expand Up @@ -196,7 +216,7 @@ public void compress(Writer out, int linebreakpos)
// Some source control tools don't like it when files containing lines longer
// than, say 8000 characters, are checked in. The linebreak option is used in
// that case to split long lines after a specific column.
int i = 0;
i = 0;
int linestartpos = 0;
sb = new StringBuffer(css);
while (i < sb.length()) {
Expand All @@ -215,7 +235,7 @@ public void compress(Writer out, int linebreakpos)
css = css.replaceAll(";;+", ";");

// restore preserved comments and strings
for(int i = 0, max = preservedTokens.size(); i < max; i++) {
for(i = 0, max = preservedTokens.size(); i < max; i++) {
css = css.replace("___YUICSSMIN_PRESERVED_TOKEN_" + i + "___", preservedTokens.get(i).toString());
}

Expand Down

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