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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 set of classes to support aural CSS.
*/
goog.provide('cvox.AuralProperty');
goog.provide('cvox.AuralStyleConverter');
goog.provide('cvox.AuralStyleUtil');
// This seems the only way to lay out an enum and use it as a key.
/**
* @enum {string}
*/
cvox.AuralProperty = {
VOLUME: 'VOLUME',
SPEAK: 'SPEAK',
PAUSE_BEFORE: 'PAUSE_BEFORE',
PAUSE_AFTER: 'PAUSE_AFTER',
PAUSE: 'PAUSE',
CUE_BEFORE: 'CUE_BEFORE',
CUE_AFTER: 'CUE_AFTER',
CUE: 'CUE',
PLAY_DURING: 'PLAY_DURING',
AZIMUTH: 'AZIMUTH',
ELEVATION: 'ELEVATION',
SPEECH_RATE: 'SPEECH_RATE',
VOICE_FAMILY: 'VOICE_FAMILY',
PITCH: 'PITCH',
PITCH_RANGE: 'PITCH_RANGE',
STRESS: 'STRESS',
RICHNESS: 'RICHNESS',
SPEAK_PUNCTUATION: 'SPEAK_PUNCTUATION',
SPEAK_NUMERIAL: 'SPEAK_NUMERIAL',
SPEAK_HEADER: 'SPEAK_HEADER',
NONE: 'NONE'
};
/* A series of conversion functions. */
/**
* An identity conversion.
* @param {number} value The aural CSS value to convert.
* @return {number} The resulting tts property value.
*/
cvox.AuralStyleConverter.identity = function(value) {
return value;
};
/**
* Conversion from an aural style property to Chrome TTS property.
* TODO(dtseng): no-op's below need to be supported by the extension API itself
* or by ChromeVox.
* @type {Object<cvox.AuralProperty, string>}
*/
cvox.AuralStyleConverter.propertyTable = {
VOLUME: 'volume',
SPEAK: 'no-op',
PAUSE_BEFORE: 'no-op',
PAUSE_AFTER: 'no-op',
PAUSE: 'no-op',
CUE_BEFORE: 'no-op',
CUE_AFTER: 'no-op',
CUE: 'no-op',
PLAY_DURING: 'no-op',
AZIMUTH: 'no-op',
ELEVATION: 'no-op',
SPEECH_RATE: 'relativeRate',
VOICE_FAMILY: 'no-op',
PITCH: 'relativePitch',
PITCH_RANGE: 'no-op',
STRESS: 'no-op',
RICHNESS: 'no-op',
SPEAK_PUNCTUATION: 'no-op',
SPEAK_NUMERIAL: 'no-op',
SPEAK_HEADER: 'no-op',
NONE: 'no-op'
};
/**
* Conversion from an aural style value to Chrome TTS value.
* TODO(dtseng): Conversion of aural CSS values is incomplete; everything is an
* identity conversion at the moment.
* @type {Object<cvox.AuralProperty, function(*)>}
*/
cvox.AuralStyleConverter.valueTable = {
VOLUME: cvox.AuralStyleConverter.identity,
SPEAK: cvox.AuralStyleConverter.identity,
PAUSE_BEFORE: cvox.AuralStyleConverter.identity,
PAUSE_AFTER: cvox.AuralStyleConverter.identity,
PAUSE: cvox.AuralStyleConverter.identity,
CUE_BEFORE: cvox.AuralStyleConverter.identity,
CUE_AFTER: cvox.AuralStyleConverter.identity,
CUE: cvox.AuralStyleConverter.identity,
PLAY_DURING: cvox.AuralStyleConverter.identity,
AZIMUTH: cvox.AuralStyleConverter.identity,
ELEVATION: cvox.AuralStyleConverter.identity,
SPEECH_RATE: cvox.AuralStyleConverter.identity,
VOICE_FAMILY: cvox.AuralStyleConverter.identity,
PITCH: cvox.AuralStyleConverter.identity,
PITCH_RANGE: cvox.AuralStyleConverter.identity,
STRESS: cvox.AuralStyleConverter.identity,
RICHNESS: cvox.AuralStyleConverter.identity,
SPEAK_PUNCTUATION: cvox.AuralStyleConverter.identity,
SPEAK_NUMERIAL: cvox.AuralStyleConverter.identity,
SPEAK_HEADER: cvox.AuralStyleConverter.identity,
NONE: cvox.AuralStyleConverter.identity
};
/**
* Converts a given aural property/value rule to a tts property/value.
* @param {cvox.AuralProperty} property The property.
* @param {*} value The CSS-based value.
* @return {Object} An object holding tts property and value.
*/
cvox.AuralStyleConverter.convertRule = function(property, value) {
return {
property: cvox.AuralStyleConverter.propertyTable[property],
value: cvox.AuralStyleConverter.valueTable[property](value)
};
};
/**
* Converts an aural CSS style block to a TTS property object.
* @param {Object<cvox.AuralProperty, *>} style The style.
* @return {Object} The tts property object.
*/
cvox.AuralStyleConverter.convertStyle = function(style) {
var ttsProperties = {};
for (var property in style) {
var ttsProperty =
cvox.AuralStyleConverter.convertRule(property, style[property]);
ttsProperties[ttsProperty.property] = ttsProperty.value;
}
return ttsProperties;
};
/**
* Gets the aural style for a node.
* @param {Node} node The node.
* @return {Object} The aural style, converted to tts properties.
*/
cvox.AuralStyleUtil.getStyleForNode = function(node) {
var style = cvox.AuralStyleUtil.defaultStyles[node.tagName];
if (!style) {
return null;
}
return cvox.AuralStyleConverter.convertStyle(style);
};
/**
* A list of default aural styles.
*/
cvox.AuralStyleUtil.defaultStyles = {
'ARTICLE': {
PITCH: -0.1
},
'ASIDE': {
PITCH: -0.1
},
'FOOTER': {
PITCH: -0.1
},
'H1': {
PITCH: -0.3
},
'H2': {
PITCH: -0.25
},
'H3': {
PITCH: -0.2
},
'H4': {
PITCH: -0.15
},
'H5': {
PITCH: -0.1
},
'H6': {
PITCH: -0.05
},
'HEADER': {
PITCH: -0.1
},
'HGROUP': {
PITCH: -0.1
},
'MARK': {
PITCH: -0.1
},
'NAV': {
PITCH: -0.1
},
'SECTION': {
PITCH: -0.1
},
'TIME': {
PITCH: -0.1
}
};
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