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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 A class for loading and storing the maps for math atoms from
* JSON files. The class (and entries) can then be used as via the
* background page.
*/
goog.provide('cvox.MathMap');
goog.require('cvox.MathCompoundStore');
goog.require('cvox.MathUtil');
/**
*
* @constructor
*/
cvox.MathMap = function() {
/**
* The compund store for symbol and function mappings.
* @type {cvox.MathCompoundStore}
*/
this.store = cvox.MathCompoundStore.getInstance();
cvox.MathMap.parseFiles(
cvox.MathMap.FUNCTIONS_FILES_.map(
function(file) {
return cvox.MathMap.FUNCTIONS_PATH_ + file;
}))
.forEach(goog.bind(this.store.addFunctionRules, this.store));
cvox.MathMap.parseFiles(
cvox.MathMap.SYMBOLS_FILES_.map(
function(file) {
return cvox.MathMap.SYMBOLS_PATH_ + file;
}))
.forEach(goog.bind(this.store.addSymbolRules, this.store));
var cstrValues = this.store.getDynamicConstraintValues();
/**
* Array of domain names.
* @type {Array<string>}
*/
this.allDomains = cstrValues.domain;
/**
* Array of style names.
* @type {Array<string>}
*/
this.allStyles = cstrValues.style;
};
/**
* Stringifies MathMap into JSON object.
* @return {string} The stringified version of the mapping.
*/
cvox.MathMap.prototype.stringify = function() {
return JSON.stringify(this);
};
/**
* Path to dir containing ChromeVox JSON definitions for math speak.
* @type {string}
* @const
* @private
*/
cvox.MathMap.MATHMAP_PATH_ = 'chromevox/background/mathmaps/';
/**
* Subpath to dir containing ChromeVox JSON definitions for symbols.
* @type {string}
* @const
* @private
*/
cvox.MathMap.SYMBOLS_PATH_ = cvox.MathMap.MATHMAP_PATH_ + 'symbols/';
/**
* Subpath to dir containing ChromeVox JSON definitions for functions.
* @type {string}
* @const
* @private
*/
cvox.MathMap.FUNCTIONS_PATH_ = cvox.MathMap.MATHMAP_PATH_ + 'functions/';
/**
* Array of JSON filenames containing symbol definitions for math speak.
* @type {Array<string>}
* @const
* @private
*/
cvox.MathMap.SYMBOLS_FILES_ = [
// Greek
'greek-capital.json', 'greek-small.json', 'greek-scripts.json',
'greek-mathfonts.json', 'greek-symbols.json',
// Hebrew
'hebrew_letters.json',
// Latin
'latin-lower-double-accent.json', 'latin-lower-normal.json',
'latin-lower-phonetic.json', 'latin-lower-single-accent.json',
'latin-rest.json', 'latin-upper-double-accent.json',
'latin-upper-normal.json', 'latin-upper-single-accent.json',
'latin-mathfonts.json',
// Math Symbols
'math_angles.json', 'math_arrows.json', 'math_characters.json',
'math_delimiters.json', 'math_digits.json', 'math_geometry.json',
'math_harpoons.json', 'math_non_characters.json', 'math_symbols.json',
'math_whitespace.json', 'other_stars.json'
];
/**
* Array of JSON filenames containing symbol definitions for math speak.
* @type {Array<string>}
* @const
* @private
*/
cvox.MathMap.FUNCTIONS_FILES_ = [
'algebra.json', 'elementary.json', 'hyperbolic.json', 'trigonometry.json'
];
/**
* Loads JSON for a given file name.
* @param {string} file A valid filename.
* @return {string} A string representing JSON array.
*/
cvox.MathMap.loadFile = function(file) {
try {
return cvox.MathMap.readJSON_(file);
} catch (x) {
console.log('Unable to load file: ' + file + ', error: ' + x);
}
};
/**
* Loads a list of JSON files.
* @param {Array<string>} files An array of valid filenames.
* @return {Array<string>} A string representing JSON array.
*/
cvox.MathMap.loadFiles = function(files) {
return files.map(cvox.MathMap.loadFile);
};
/**
* Creates an array of JSON objects from a list of files.
* @param {Array<string>} files An array of filenames.
* @return {Array<Object>} Array of JSON objects.
*/
cvox.MathMap.parseFiles = function(files) {
var strs = cvox.MathMap.loadFiles(files);
return [].concat.apply([], strs.map(
// Note: As JSON.parse does not expect the value index as the second
// parameter, we wrap it.
function(value) { return JSON.parse(value); }));
};
/**
* Takes path to a JSON file and returns a JSON object.
* @param {string} path Contains the path to a JSON file.
* @return {string} JSON.
* @private
*/
cvox.MathMap.readJSON_ = function(path) {
var url = chrome.extension.getURL(path);
if (!url) {
throw 'Invalid path: ' + path;
}
var xhr = new XMLHttpRequest();
xhr.open('GET', url, false);
xhr.send();
return xhr.responseText;
};
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