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index.js
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index.js
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'use strict';
var es = require('event-stream');
var gutil = require('gulp-util');
var PluginError = gutil.PluginError;
var postcss = require('postcss');
var scopeSelector;
var scope;
const PLUGIN_NAME = 'gulp-prefix-css';
scope = postcss(function(css) {
css.walkRules(function(rule) {
rule.selectors = rule.selectors.map(function(selector) {
if (selector.trim().toLowerCase() === 'body') {
return scopeSelector;
} else {
return scopeSelector + ' ' + selector;
}
});
});
});
module.exports = function cssPrefixer(scopeSelectorOption) {
scopeSelector = scopeSelectorOption;
if (!scopeSelector) {
throw new PluginError(PLUGIN_NAME, 'Missing a css prefix!');
}
return es.map(function(file, callback) {
if (file.isNull()) {
return cb(null, file);
}
if (file.isBuffer()) {
file.contents = new Buffer(scope.process(file.contents).css);
}
if (file.isStream()) {
var through = es.through();
var wait = es.wait(function(err, contents) {
through.write(scope.process(contents).css);
through.end();
});
file.contents.pipe(wait);
file.contents = through;
}
callback(null, file);
})
};