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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @fileoverview Classes for custom functions for the speech rule engine.
*
*/
goog.provide('cvox.SpeechRuleFunctions');
goog.provide('cvox.SpeechRuleFunctions.ContextFunctions');
goog.provide('cvox.SpeechRuleFunctions.CustomQueries');
goog.provide('cvox.SpeechRuleFunctions.CustomStrings');
/**
* @constructor
*/
cvox.SpeechRuleFunctions = function() { };
/**
* Private superclass of all the custom function stores.
* @constructor
* @param {string} prefix A prefix string for the function names.
* @param {Object<string, Function>} store Storage object.
* @private
*/
cvox.SpeechRuleFunctions.Store_ = function(prefix, store) {
/** @private */
this.prefix_ = prefix;
/** @private */
this.store_ = store;
};
/**
* Adds a new function for the function store.
* @param {string} name A name.
* @param {!Function} func A function.
*/
cvox.SpeechRuleFunctions.Store_.prototype.add = function(name, func) {
if (this.checkCustomFunctionSyntax_(name)) {
this.store_[name] = func;
}
};
/**
* Retrieves a function with the given name if one exists.
* @param {string} name A name.
* @return {Function} The function if it exists.
*/
cvox.SpeechRuleFunctions.Store_.prototype.lookup = function(name) {
return this.store_[name];
};
/**
* Context function for use in speech rules.
* @typedef {function(!Node): Array<Node>}
*/
cvox.SpeechRuleFunctions.CustomQuery;
/**
* @constructor
* @extends {cvox.SpeechRuleFunctions.Store_}
*/
cvox.SpeechRuleFunctions.CustomQueries = function() {
var store =
/** @type {Object<string, cvox.SpeechRuleFunctions.CustomQuery>} */ ({});
goog.base(this, 'CQF', store);
};
goog.inherits(cvox.SpeechRuleFunctions.CustomQueries,
cvox.SpeechRuleFunctions.Store_);
/**
* Context function for use in speech rules.
* @typedef {function(!Node): string}
*/
cvox.SpeechRuleFunctions.CustomString;
/**
* @constructor
* @extends {cvox.SpeechRuleFunctions.Store_}
*/
cvox.SpeechRuleFunctions.CustomStrings = function() {
var store =
/** @type {Object<string, cvox.SpeechRuleFunctions.CustomString>} */ ({});
goog.base(this, 'CSF', store);
};
goog.inherits(cvox.SpeechRuleFunctions.CustomStrings,
cvox.SpeechRuleFunctions.Store_);
/**
* Context function for use in speech rules.
* @typedef {function(Array<Node>, ?string): (function(): string)}
*/
cvox.SpeechRuleFunctions.ContextFunction;
/**
* @constructor
* @extends {cvox.SpeechRuleFunctions.Store_}
*/
cvox.SpeechRuleFunctions.ContextFunctions = function() {
var store =
/** @type {Object<string, cvox.SpeechRuleFunctions.ContextFunction>} */
({});
goog.base(this, 'CTXF', store);
};
goog.inherits(cvox.SpeechRuleFunctions.ContextFunctions,
cvox.SpeechRuleFunctions.Store_);
/**
* Checks validity for a custom function name.
* @param {string} name The name of the custom function.
* @return {!boolean} True if the name is valid.
* @private
*/
cvox.SpeechRuleFunctions.Store_.prototype.
checkCustomFunctionSyntax_ = function(name) {
var reg = new RegExp('^' + this.prefix_);
if (!name.match(reg)) {
console.log(
'FunctionError: Invalid function name. Expected prefix' +
this.prefix_);
return false;
}
return true;
};
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