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table.js
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table.js
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// Table metadata
'use strict';
var check = require('./check');
var encode = require('./types').encode;
var sizeOf = require('./types').sizeOf;
/**
* @exports opentype.Table
* @class
* @param {string} tableName
* @param {Array} fields
* @param {Object} options
* @constructor
*/
function Table(tableName, fields, options) {
var i;
for (i = 0; i < fields.length; i += 1) {
var field = fields[i];
this[field.name] = field.value;
}
this.tableName = tableName;
this.fields = fields;
if (options) {
var optionKeys = Object.keys(options);
for (i = 0; i < optionKeys.length; i += 1) {
var k = optionKeys[i];
var v = options[k];
if (this[k] !== undefined) {
this[k] = v;
}
}
}
}
/**
* Encodes the table and returns an array of bytes
* @return {Array}
*/
Table.prototype.encode = function() {
return encode.TABLE(this);
};
/**
* Get the size of the table.
* @return {number}
*/
Table.prototype.sizeOf = function() {
return sizeOf.TABLE(this);
};
/**
* @private
*/
function ushortList(itemName, list, count) {
if (count === undefined) {
count = list.length;
}
var fields = new Array(list.length + 1);
fields[0] = {name: itemName + 'Count', type: 'USHORT', value: count};
for (var i = 0; i < list.length; i++) {
fields[i + 1] = {name: itemName + i, type: 'USHORT', value: list[i]};
}
return fields;
}
/**
* @private
*/
function tableList(itemName, records, itemCallback) {
var count = records.length;
var fields = new Array(count + 1);
fields[0] = {name: itemName + 'Count', type: 'USHORT', value: count};
for (var i = 0; i < count; i++) {
fields[i + 1] = {name: itemName + i, type: 'TABLE', value: itemCallback(records[i], i)};
}
return fields;
}
/**
* @private
*/
function recordList(itemName, records, itemCallback) {
var count = records.length;
var fields = [];
fields[0] = {name: itemName + 'Count', type: 'USHORT', value: count};
for (var i = 0; i < count; i++) {
fields = fields.concat(itemCallback(records[i], i));
}
return fields;
}
// Common Layout Tables
/**
* @exports opentype.Coverage
* @class
* @param {opentype.Table}
* @constructor
* @extends opentype.Table
*/
function Coverage(coverageTable) {
if (coverageTable.format === 1) {
Table.call(this, 'coverageTable',
[{name: 'coverageFormat', type: 'USHORT', value: 1}]
.concat(ushortList('glyph', coverageTable.glyphs))
);
} else {
check.assert(false, 'Can\'t create coverage table format 2 yet.');
}
}
Coverage.prototype = Object.create(Table.prototype);
Coverage.prototype.constructor = Coverage;
function ScriptList(scriptListTable) {
Table.call(this, 'scriptListTable',
recordList('scriptRecord', scriptListTable, function(scriptRecord, i) {
var script = scriptRecord.script;
var defaultLangSys = script.defaultLangSys;
check.assert(!!defaultLangSys, 'Unable to write GSUB: script ' + scriptRecord.tag + ' has no default language system.');
return [
{name: 'scriptTag' + i, type: 'TAG', value: scriptRecord.tag},
{name: 'script' + i, type: 'TABLE', value: new Table('scriptTable', [
{name: 'defaultLangSys', type: 'TABLE', value: new Table('defaultLangSys', [
{name: 'lookupOrder', type: 'USHORT', value: 0},
{name: 'reqFeatureIndex', type: 'USHORT', value: defaultLangSys.reqFeatureIndex}]
.concat(ushortList('featureIndex', defaultLangSys.featureIndexes)))}
].concat(recordList('langSys', script.langSysRecords, function(langSysRecord, i) {
var langSys = langSysRecord.langSys;
return [
{name: 'langSysTag' + i, type: 'TAG', value: langSysRecord.tag},
{name: 'langSys' + i, type: 'TABLE', value: new Table('langSys', [
{name: 'lookupOrder', type: 'USHORT', value: 0},
{name: 'reqFeatureIndex', type: 'USHORT', value: langSys.reqFeatureIndex}
].concat(ushortList('featureIndex', langSys.featureIndexes)))}
];
})))}
];
})
);
}
ScriptList.prototype = Object.create(Table.prototype);
ScriptList.prototype.constructor = ScriptList;
/**
* @exports opentype.FeatureList
* @class
* @param {opentype.Table}
* @constructor
* @extends opentype.Table
*/
function FeatureList(featureListTable) {
Table.call(this, 'featureListTable',
recordList('featureRecord', featureListTable, function(featureRecord, i) {
var feature = featureRecord.feature;
return [
{name: 'featureTag' + i, type: 'TAG', value: featureRecord.tag},
{name: 'feature' + i, type: 'TABLE', value: new Table('featureTable', [
{name: 'featureParams', type: 'USHORT', value: feature.featureParams},
].concat(ushortList('lookupListIndex', feature.lookupListIndexes)))}
];
})
);
}
FeatureList.prototype = Object.create(Table.prototype);
FeatureList.prototype.constructor = FeatureList;
/**
* @exports opentype.LookupList
* @class
* @param {opentype.Table}
* @param {Object}
* @constructor
* @extends opentype.Table
*/
function LookupList(lookupListTable, subtableMakers) {
Table.call(this, 'lookupListTable', tableList('lookup', lookupListTable, function(lookupTable) {
var subtableCallback = subtableMakers[lookupTable.lookupType];
check.assert(!!subtableCallback, 'Unable to write GSUB lookup type ' + lookupTable.lookupType + ' tables.');
return new Table('lookupTable', [
{name: 'lookupType', type: 'USHORT', value: lookupTable.lookupType},
{name: 'lookupFlag', type: 'USHORT', value: lookupTable.lookupFlag}
].concat(tableList('subtable', lookupTable.subtables, subtableCallback)));
}));
}
LookupList.prototype = Object.create(Table.prototype);
LookupList.prototype.constructor = LookupList;
// Record = same as Table, but inlined (a Table has an offset and its data is further in the stream)
// Don't use offsets inside Records (probable bug), only in Tables.
exports.Record = exports.Table = Table;
exports.Coverage = Coverage;
exports.ScriptList = ScriptList;
exports.FeatureList = FeatureList;
exports.LookupList = LookupList;
exports.ushortList = ushortList;
exports.tableList = tableList;
exports.recordList = recordList;