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Lesscss is a java wrapper for the JavaScript LESS to CSS compiler
/*
* Copyright (c) 2013 Houbrechts IT
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Compile function to be called from Java
*/
var parseException,
sourceMapContent,
readFileAsString,
readFileAsBytes,
normalize,
javaMapToObject = function (map) {
var iter = map.keySet().iterator(),
key,
result;
if (iter.hasNext()) {
result = {};
while (iter.hasNext()) {
key = iter.next();
result[String(key)] = String(map.get(key));
}
return result;
}
return null;
},
setSourceMapOptions = function (lessOptions, compilationOptions) {
lessOptions.sourceMapOutputFilename = String(compilationOptions.destinationFilename);
if (compilationOptions.options.sourceMapMapInline) {
lessOptions.sourceMap = true;
}
if (compilationOptions.options.sourceMapRootpath) {
lessOptions.sourceMapRootpath = String(compilationOptions.options.sourceMapRootpath);
}
if (compilationOptions.options.sourceMapBasepath) {
lessOptions.sourceMapBasepath = String(compilationOptions.options.sourceMapBasepath);
} else {
lessOptions.sourceMapBasepath = less.modules.path.dirname(String(compilationOptions.sourceFilename));
}
if (compilationOptions.options.sourceMapURL) {
lessOptions.sourceMapURL = String(compilationOptions.options.sourceMapURL);
}
if (compilationOptions.options.sourceMapLessInline) {
lessOptions.outputSourceFiles = true;
}
if (compilationOptions.options.sourceMap) {
lessOptions.sourceMapFullFilename = String(compilationOptions.sourceMapFilename);
lessOptions.sourceMapFilename = lessOptions.sourceMapFullFilename;
lessOptions.sourceMap = less.modules.path.basename(lessOptions.sourceMapFullFilename);
lessOptions.writeSourceMap = function (content) {
sourceMapContent = content;
};
}
},
compile = function (source, compilationOptions, importReader) {
var result,
lessOptions = {
silent: compilationOptions.options.silent,
lint: compilationOptions.options.lint,
strictImports: compilationOptions.options.strictImports,
compress: compilationOptions.options.compress,
dependenciesOnly: compilationOptions.options.dependenciesOnly,
minify: compilationOptions.options.minify,
ieCompat: compilationOptions.options.ieCompat,
javascriptEnabled: compilationOptions.options.javascriptEnabled,
optimization: compilationOptions.options.optimizationLevel,
relativeUrls: compilationOptions.options.relativeUrls,
strictMath: compilationOptions.options.strictMath,
strictUnits: compilationOptions.options.strictUnits,
filename: less.modules.path.basename(String(compilationOptions.sourceFilename))
},
additionalData = {
globalVars: javaMapToObject(compilationOptions.options.globalVars),
modifyVars: javaMapToObject(compilationOptions.options.modifyVars)
};
if (compilationOptions.options.rootpath) {
lessOptions.rootpath = String(compilationOptions.options.rootpath);
}
if (compilationOptions.options.dumpLineNumbers && compilationOptions.options.dumpLineNumbers.optionString) {
lessOptions.dumpLineNumbers = String(compilationOptions.options.dumpLineNumbers.optionString);
}
setSourceMapOptions(lessOptions, compilationOptions);
lessOptions.currentFileInfo = {
relativeUrls: lessOptions.relativeUrls, //option - whether to adjust URL's to be relative
filename: String(compilationOptions.sourceFilename), //full resolved filename of current file
rootpath: lessOptions.rootpath, //path to append to normal URLs for this node
currentDirectory: '', //path to the current file, absolute
rootFilename: lessOptions.filename, //filename of the base file
entryPath: '' //absolute path to the entry file
};
readFileAsString = function (file) {
var data = importReader.read(file);
if (data === null) {
throw {type: 'File', message: "'" + file + "' wasn't found"};
}
return String(data);
};
readFileAsBytes = function (file) {
var data = importReader.readBytes(file);
if (data === null) {
throw {type: 'File', message: "'" + file + "' wasn't found"};
}
return data;
};
normalize = function (path) {
return String(importReader.normalize(path));
};
try {
parseException = null;
sourceMapContent = null;
new (less.Parser)(lessOptions).parse(String(source), function (e, tree) {
if (e) {
throw e;
}
result = (lessOptions.dependenciesOnly) ? '' : tree.toCSS(lessOptions);
}, additionalData);
return (lessOptions.minify) ? cssmin(result) : result;
} catch (e) {
parseException = 'less parse exception: ' + e.message;
if (e.filename) {
parseException += '\nin ' + e.filename + ' at line ' + e.line;
}
if (e.extract) {
var extract = e.extract;
parseException += '\nextract';
for (var line in extract) {
if (extract.hasOwnProperty(line) && extract[line]) {
parseException += '\n' + e.extract[line];
}
}
}
return null;
}
};
less.Parser.fileLoader = function (file, currentFileInfo, callback, env) {
var href = file;
if (currentFileInfo && currentFileInfo.currentDirectory && !/^\//.test(file)) {
href = less.modules.path.join(currentFileInfo.currentDirectory, file);
}
var path = less.modules.path.dirname(href);
var newFileInfo = {
currentDirectory: path + '/',
filename: href
};
if (currentFileInfo) {
newFileInfo.entryPath = currentFileInfo.entryPath;
newFileInfo.rootpath = currentFileInfo.rootpath;
newFileInfo.rootFilename = currentFileInfo.rootFilename;
newFileInfo.relativeUrls = currentFileInfo.relativeUrls;
} else {
newFileInfo.entryPath = path;
newFileInfo.rootpath = less.rootpath || path;
newFileInfo.rootFilename = href;
newFileInfo.relativeUrls = env.relativeUrls;
}
var j = file.lastIndexOf('/');
if (newFileInfo.relativeUrls && !/^(?:[a-z-]+:|\/)/.test(file) && j != -1) {
var relativeSubDirectory = file.slice(0, j + 1);
newFileInfo.rootpath = (newFileInfo.rootpath || '') + relativeSubDirectory; // append (sub|sup) directory path of imported file
}
newFileInfo.currentDirectory = path;
newFileInfo.filename = href;
var data = null;
try {
data = readFileAsString(href);
} catch (e) {
callback({ type: 'File', message: "'" + less.modules.path.basename(href) + "' wasn't found" });
return;
}
try {
callback(null, data, href, newFileInfo, { lastModified: 0 });
} catch (e) {
callback(e, null, href);
}
};
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