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build.js
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build.js
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var http = require('http');
var fs = require('fs');
var zlib = require('zlib');
var tar = require('tar');
var async = require('async');
var request = require('request');
var byline = require('byline');
var DUMP_URL = 'http://glyphwiki.org/dump.tar.gz';
var IVD_URL = 'http://www.unicode.org/ivd/data/2016-08-15/IVD_Sequences.txt';
var SOURCES_DIR = './sources';
var DATA_DIR = './data';
// make SOURCES_DIR if not exists
if (!fs.existsSync(SOURCES_DIR)) {
fs.mkdirSync(SOURCES_DIR);
}
if (!fs.existsSync(DATA_DIR)) {
fs.mkdirSync(DATA_DIR);
}
var alias = {};
var IVD = {};
var aliasGroup = {};
var minAliasGroup = {};
var minMap = {};
var resolveAlias = function (charCode) {
while (alias[charCode] !== undefined) charCode = alias[charCode];
return charCode;
};
var recordInGroup = function (alias, string) {
if (aliasGroup[alias] === undefined) {
aliasGroup[alias] = [];
}
aliasGroup[alias].push(string);
};
// pseudo-base64
var base64 = function (n) {
var ret = '';
var charset = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ@_'
if (n === 0) return charset[0];
while (n !== 0) {
ret = charset[n % 64] + ret;
n = Math.floor(n / 64);
}
return ret;
}
// ES6 String.fromCodePoint polyfilling
/*! http://mths.be/fromcodepoint v0.1.0 by @mathias */
var fromCodePoint = function (codePoints) {
var MAX_SIZE = 0x4000;
var codeUnits = [];
var highSurrogate;
var lowSurrogate;
var index = -1;
var length = arguments.length;
if (!length) {
return '';
}
var result = '';
while (++index < length) {
var codePoint = Number(arguments[index]);
if (
!isFinite(codePoint) || // `NaN`, `+Infinity`, or `-Infinity`
codePoint < 0 || // not a valid Unicode code point
codePoint > 0x10FFFF || // not a valid Unicode code point
Math.floor(codePoint) != codePoint // not an integer
) {
throw RangeError('Invalid code point: ' + codePoint);
}
if (codePoint <= 0xFFFF) { // BMP code point
codeUnits.push(codePoint);
} else { // Astral code point; split in surrogate halves
// http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
codePoint -= 0x10000;
highSurrogate = (codePoint >> 10) + 0xD800;
lowSurrogate = (codePoint % 0x400) + 0xDC00;
codeUnits.push(highSurrogate, lowSurrogate);
}
if (index + 1 == length || codeUnits.length > MAX_SIZE) {
result += String.fromCharCode.apply(null, codeUnits);
codeUnits.length = 0;
}
}
return result;
};
// ES6 String.prototype.codePointAt pseudo-polyfilling
/*! http://mths.be/codepointat v0.1.0 by @mathias */
var toCodePoint = function (string) {
var size = string.length;
var index = 0;
// Get the first code unit
var first = string.charCodeAt(index);
var second;
if ( // check if it’s the start of a surrogate pair
first >= 0xD800 && first <= 0xDBFF && // high surrogate
size > index + 1 // there is a next code unit
) {
second = string.charCodeAt(index + 1);
if (second >= 0xDC00 && second <= 0xDFFF) { // low surrogate
// http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
return (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
}
}
return first;
};
module.exports = function (done) {
// fetch sources
async.parallel([
// fetch the dump
function (done) {
async.waterfall([
// check if dump file exists
function (done) {
fs.exists(SOURCES_DIR + '/dump_newest_only.txt', function (exists) {
done(null, exists);
});
},
// download dump file
function (exists, done) {
if (exists) {
console.log('Dump file exists. Continue.')
done();
} else {
var download = request(DUMP_URL);
download.on('error', done);
download.on('end', function () {
console.log('Dump file download ended.');
});
var gunzip = zlib.createGunzip();
gunzip.on('error', done);
gunzip.on('finish', function () {
console.log('Dump file gzip inflation finished.');
});
var extract = new tar.Parse();
extract.on('error', done);
extract.on('entry', function (entry) {
if (entry.path === 'dump_newest_only.txt') {
var write = fs.createWriteStream(SOURCES_DIR + '/dump_newest_only.txt');
write.on('error', done);
write.on('finish', function () {
console.log('Dump file writing finished.');
done();
});
entry.pipe(write);
}
});
download.pipe(gunzip).pipe(extract);
console.log('Dump file downloading...');
}
},
// parse dump file
function (done) {
var read = fs.createReadStream(SOURCES_DIR + '/dump_newest_only.txt');
read.on('error', done);
var parseLine = byline.createStream();
parseLine.on('error', done);
var kanjiSpans = [
{from: 0x3400, to: 0x4DBF}, // CJK Extension A
{from: 0x4E00, to: 0x9FFF}, // CJK
{from: 0xF900, to: 0xFAFF}, // CJK Compatibility
{from: 0x20000, to: 0x2A6DF}, // CJK Extension B
{from: 0x2A700, to: 0x2B73F}, // CJK Extension C
{from: 0x2B740, to: 0x2B81F}, // CJK Extension D
];
parseLine.on('data', function (line) {
var columns = line.toString().split('|');
if (columns.length !== 3) {
return;
}
columns = columns.map(function (column) {
return column.trim();
});
// register kanji to IVD
if (columns[0].match(new RegExp('^u[0-9a-f]{4,5}$'))) {
var codePoint = parseInt(columns[0].slice(1), 16);
if (kanjiSpans.some(function (span) {
return span.from <= codePoint && codePoint <= span.to;
})) {
var kanji = fromCodePoint(codePoint);
if (IVD[kanji] === undefined) {
IVD[kanji] = {};
}
}
}
var aliasMatch = columns[2].match(new RegExp('^99:0:0:0:0:200:200:([^:]+)$'));
if (aliasMatch) {
var aliasedTo = aliasMatch[1];
alias[columns[0]] = aliasedTo;
}
});
parseLine.on('finish', function () {
console.log('Dump file parsing finished.');
done();
});
read.pipe(parseLine);
}
], done);
},
// fetch IVD
function (done) {
async.waterfall([
// check if IVD file exists
function (done) {
fs.exists(SOURCES_DIR + '/IVD_Sequences.txt', function (exists) {
done(null, exists);
});
},
// download IVD data
function (exists, done) {
if (exists) {
console.log('IVD file exists. Continue.')
done();
} else {
var download = request(IVD_URL);
download.on('error', done);
download.on('finish', function () {
console.log('IVD file download finished.');
});
var write = fs.createWriteStream(SOURCES_DIR + '/IVD_Sequences.txt');
write.on('error', done);
write.on('finish', function () {
console.log('IVD file writing finished');
done();
});
download.pipe(write);
console.log('IVD file downloading...');
}
},
// parse IVD data
function (done) {
var read = fs.createReadStream(SOURCES_DIR + '/IVD_Sequences.txt');
read.on('error', done);
var parseLine = byline.createStream();
parseLine.on('error', done);
parseLine.on('data', function (line) {
line = line.toString();
if (line.slice(0, 1) === '#') {
return;
}
var columns = line.split(';');
if (columns.length !== 3) {
return;
}
columns = columns.map(function (column) {
return column.trim();
});
var shortName;
switch (columns[1]) {
case 'Adobe-Japan1':
shortName = 'AJ';
break;
case 'Hanyo-Denshi':
case 'Moji_Joho':
shortName = 'HD';
break;
}
if (!shortName) {
return;
}
var codePoints = columns[0].split(' ');
codePoints = codePoints.map(function (codePoint) {
return fromCodePoint(parseInt(codePoint, 16));
});
if (IVD[codePoints[0]] === undefined) {
IVD[codePoints[0]] = {};
}
IVD[codePoints[0]][codePoints[1]] = [shortName];
});
parseLine.on('finish', function () {
console.log('IVD file parsing finished.');
done();
});
read.pipe(parseLine);
}
], done);
}
], function (error) {
if (error) {
console.error(error);
return;
}
console.log('Parsing completed.');
// resolve aliases in IVD
for (var firstCode in IVD) if (IVD.hasOwnProperty(firstCode)) {
var firstCodePoint = toCodePoint(firstCode).toString(16).toLowerCase();
for (var secondCode in IVD[firstCode]) if (IVD[firstCode].hasOwnProperty(secondCode)) {
var secondCodePoint = toCodePoint(secondCode).toString(16).toLowerCase();
var glyphName = 'u' + firstCodePoint + '-u' + secondCodePoint;
var resolved = resolveAlias(glyphName);
IVD[firstCode][secondCode].push(resolved);
recordInGroup(resolved, firstCode + secondCode);
}
var standardGlyph = 'u' + firstCodePoint;
IVD[firstCode].std = resolveAlias(standardGlyph);
recordInGroup(IVD[firstCode].std, firstCode);
}
// minify aliases
var cnt = 0;
for (var aliasName in aliasGroup) if (aliasGroup.hasOwnProperty(aliasName)) {
var aliases = aliasGroup[aliasName];
if (aliases.length >= 2) {
var minAliasName = base64(cnt);
cnt++;
minAliasGroup[minAliasName] = aliases;
minMap[aliasName] = minAliasName;
}
}
// minify aliases in IVD
for (var firstCode in IVD) if (IVD.hasOwnProperty(firstCode)) {
for (var secondCode in IVD[firstCode]) if (IVD[firstCode].hasOwnProperty(secondCode)) {
if (secondCode === 'std') {
aliasName = IVD[firstCode][secondCode];
minAliasName = minMap[aliasName];
if (minAliasName === undefined) {
IVD[firstCode][secondCode] = '';
} else {
IVD[firstCode][secondCode] = minAliasName;
}
} else {
aliasName = IVD[firstCode][secondCode][1];
minAliasName = minMap[aliasName];
if (minAliasName === undefined) {
IVD[firstCode][secondCode][1] = '';
} else {
IVD[firstCode][secondCode][1] = minAliasName;
}
}
}
}
// remove unlinked kanjies from IVD
for (var firstCode in IVD) if (IVD.hasOwnProperty(firstCode)) {
if (Object.keys(IVD[firstCode]).length === 1 && IVD[firstCode].std === '') {
delete IVD[firstCode];
}
}
console.log('Compile finished.')
// write down to json
fs.writeFile(DATA_DIR + '/ivd.json', JSON.stringify({
IVD: IVD,
aliases: minAliasGroup
}), function (error) {
if (error) {
done(error);
return;
}
console.log('Compiled file created.');
done();
});
});
};