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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 less = window.less,
parseException,
rootFilename,
readFile,
normalize,
compile = function (source, options, sourceName, importReader) {
var result,
rootPath = String(options.rootPath),
lessEnv = {
compress: options.compress,
optimization: options.optimizationLevel,
strictImports: options.strictImports,
strictMath: options.strictMath,
strictUnits: options.strictUnits,
relativeUrls: options.relativeUrls,
filename: sourceName,
dependenciesOnly: options.dependenciesOnly
};
rootFilename = sourceName;
if (rootPath.length > 0) {
lessEnv.rootpath = rootPath;
}
if (options.dumpLineNumbers.getOptionString()) {
lessEnv.dumpLineNumbers = String(options.dumpLineNumbers.getOptionString());
}
lessEnv.currentFileInfo = {
relativeUrls: lessEnv.relativeUrls, //option - whether to adjust URL's to be relative
filename: sourceName, //full resolved filename of current file
rootpath: rootPath, //path to append to normal URLs for this node
currentDirectory: '', //path to the current file, absolute
rootFilename: rootFilename, //filename of the base file
entryPath: '' //absolute path to the entry file
};
readFile = function (file) {
var data = importReader.read(file);
if (data === null) {
throw {type: 'File', message: "'" + file + "' wasn't found"};
}
return String(data);
};
normalize = function (path) {
return String(importReader.normalize(path));
};
try {
parseException = null;
new (less.Parser)(lessEnv).parse(String(source), function (e, tree) {
if (e) {
throw e;
}
result = (lessEnv.dependenciesOnly) ? '' : tree.toCSS(lessEnv);
});
return (options.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.importer = function (file, currentFileInfo, callback, env) {
var pathname = normalize(currentFileInfo.currentDirectory + file),
data,
newFileInfo = {
relativeUrls: env.relativeUrls,
entryPath: currentFileInfo.entryPath,
rootpath: currentFileInfo.rootpath,
rootFilename: currentFileInfo.rootFilename
},
parseFile = function (e) {
if (e) {
callback(e);
return;
}
env = new less.tree.parseEnv(env);
env.processImports = false;
var j = file.lastIndexOf('/');
// Pass on an updated rootpath if path of imported file is relative and file
// is in a (sub|sup) directory
//
// Examples:
// - If path of imported file is 'module/nav/nav.less' and rootpath is 'less/',
// then rootpath should become 'less/module/nav/'
// - If path of imported file is '../mixins.less' and rootpath is 'less/',
// then rootpath should become 'less/../'
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 = pathname.replace(/[^\\\/]*$/, "");
newFileInfo.filename = pathname;
env.contents[pathname] = data; // Updating top importing parser content cache.
env.currentFileInfo = newFileInfo;
new (less.Parser)(env).parse(data, function (e, root) {
callback(e, root, pathname);
});
};
try {
data = readFile(pathname);
parseFile(null);
} catch (e) {
parseFile(e);
}
};