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processing.js
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processing.js
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/** internal
* mixin Processing
*
* An internal mixin whose public methods are exposed on the [[Environment]]
* and [[Index]] classes.
**/
// REQUIRED MIXINS /////////////////////////////////////////////////////////////
//
// - [[Mime]]
// - [[Paths]]
//
// REQUIRED PROPERTIES /////////////////////////////////////////////////////////
//
// - `__trail__` (Hike.Trail)
// - `__preProcessors__` (Hash)
// - `__postProcessors__` (Hash)
// - `__bundleProcessors__` (Hash)
//
////////////////////////////////////////////////////////////////////////////////
'use strict';
// 3rd-party
var _ = require('lodash');
// internal
var Processor = require('../processor');
var getter = require('../common').getter;
////////////////////////////////////////////////////////////////////////////////
/**
* Processing#formatExtension -> Array
*
* Returns an `Array` of format extension `String`s.
*
* // => ['.js', '.css']
**/
getter(module.exports, 'formatExtension', function () {
return _.difference(this.extensions, _.keys(this.engines));
});
/**
* Processing#getPreProcessors(mimeType = null) -> Array|Types.Hash
*
* Returns an `Array` of `Processor` classes. If a `mime_type`
* argument is supplied, the processors registered under that
* extension will be returned.
*
* Preprocessors are ran before Postprocessors and Engine
* processors.
**/
module.exports.getPreProcessors = function (mimeType) {
if (mimeType) {
return this.__preProcessors__.get(mimeType).slice();
} else {
return this.__preProcessors__.clone();
}
};
/**
* Processing#getPostProcessors(mimeType = null) -> Array|Types.Hash
*
* Returns an `Array` of `Processor` classes. If a `mime_type`
* argument is supplied, the processors registered under that
* extension will be returned.
*
* Postprocessors are ran after Preprocessors and Engine processors.
**/
module.exports.getPostProcessors = function (mimeType) {
if (mimeType) {
return this.__postProcessors__.get(mimeType).slice();
} else {
return this.__postProcessors__.clone();
}
};
/**
* Processing#getBundleProcessors(mimeType = null) -> Array|Types.Hash
*
* Returns an `Array` of `Processor` classes. If a `mimeType`
* argument is supplied, the processors registered under that
* extension will be returned.
*
* Bundle Processors are ran on concatenated assets rather than
* individual files.
*
* All `Processor`s must follow the [[Template]] interface. It is
* recommended to subclass [[Template]].
**/
module.exports.getBundleProcessors = function (mimeType) {
if (mimeType) {
return this.__bundleProcessors__.get(mimeType).slice();
} else {
return this.__bundleProcessors__.clone();
}
};
/**
* Processing#registerPreProcessor(mimeType, klass[, fn]) -> Void
*
* Registers a new preprocessor `klass` for `mime_type`.
*
* registerPreprocessor('text/css', DirectiveProcessor);
*
* A function can be passed for to create a shorthand processor.
*
* registerPreProcessor('text/css', 'my_processor', function (context, data, callback) {
* callback(null, data.replace(...));
* });
**/
module.exports.registerPreProcessor = function (mimeType, klass, fn) {
var name;
if (fn) {
name = klass;
klass = Processor.create(name, fn);
}
this.__preProcessors__.get(mimeType).push(klass);
};
/**
* Processing#registerPostProcessor(mimeType, klass[, fn]) -> Void
*
* Registers a new Postprocessor `klass` for `mime_type`.
*
* registerPostprocessor('text/css', DirectiveProcessor);
*
* A function can be passed for to create a shorthand processor.
*
* registerPostprocessor('text/css', 'my_processor', function (context, data, callback) {
* callback(null, data.replace(...));
* });
**/
module.exports.registerPostProcessor = function (mimeType, klass, fn) {
var name;
if (fn) {
name = klass;
klass = Processor.create(name, fn);
}
this.__postProcessors__.get(mimeType).push(klass);
};
/**
* Processing#registerBundleProcessor(mimeType, klass[, fn]) -> Void
*
* Registers a new BundleProcessor `klass` for `mime_type`.
*
* registerBundleProcessor('text/css', CharsetNormalizer);
*
* A function can be passed for to create a shorthand processor.
*
* registerBundleProcessor('text/css', 'my_processor', function (context, data, callback) {
* callback(null, data.replace(...));
* });
**/
module.exports.registerBundleProcessor = function (mimeType, klass, fn) {
var name;
if (fn) {
name = klass;
klass = Processor.create(name, fn);
}
this.__bundleProcessors__.get(mimeType).push(klass);
};
/**
* Processing#unregisterPreProcessor(mimeType, klass) -> Void
*
* Remove Preprocessor `klass` for `mime_type`.
*
* unregisterPreprocessor('text/css', DirectiveProcessor);
**/
module.exports.unregisterPreProcessor = function (mimeType, klass) {
var processors = this.__preProcessors__.get(mimeType);
if (_.isString(klass)) {
klass = _.find(processors, function (fn) {
return (fn.name && fn.name === 'Processor:' + klass);
});
}
this.__preProcessors__.set(mimeType, _.without(processors, klass));
};
/**
* Processing#unregisterPostProcessor(mimeType, klass) -> Void
*
* Remove Postprocessor `klass` for `mime_type`.
*
* unregisterPostprocessor('text/css', DirectiveProcessor);
**/
module.exports.unregisterPostProcessor = function (mimeType, klass) {
var processors = this.__postProcessors__.get(mimeType);
if (_.isString(klass)) {
klass = _.find(processors, function (fn) {
return (fn.name && fn.name === 'Processor:' + klass);
});
}
this.__postProcessors__.set(mimeType, _.without(processors, klass));
};
/**
* Processing#unregisterBundleProcessor(mimeType, klass) -> Void
*
* Remove BundleProcessor `klass` for `mime_type`.
*
* unregisterBundleProcessor('text/css', CharsetNormalizer);
**/
module.exports.unregisterBundleProcessor = function (mimeType, klass) {
var processors = this.__bundleProcessors__.get(mimeType);
if (_.isString(klass)) {
klass = _.find(processors, function (fn) {
return (fn.name === 'Processor:' + klass);
});
}
this.__bundleProcessors__.set(mimeType, _.without(processors, klass));
};
/** internal
* Processing#addEngineToTrail(ext, klass) -> Void
*
* Registers extension (and corresponding aliases) for given `klass` in
* the `trail`.
**/
module.exports.addEngineToTrail = function (ext, klass) {
var format_ext;
this.__trail__.extensions.append(ext);
if (klass.defaultMimeType) {
format_ext = this.getExtensionForMimeType(klass.defaultMimeType);
if (format_ext) {
this.__trail__.aliases.append(format_ext, ext);
}
}
};