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"use strict";
const cmn = require("../$common.js");
const fs = require("fs");
const path = require("path");
const https = require("https");
const fCODE = 0;
const fNAME = 1;
const fCATEGORY = 2;
// combining class, bidirectional category, decomposition mapping
const fDECDIGIT = 6;
const fDIGIT = 7;
const fNUMERIC = 8;
const fMIRRORED = 9;
const fOLDNAME = 10;
const fCOMMENT = 11;
const fUPPERCASE = 12;
const fLOWERCASE = 13;
const fTITLECASE = 14;
// db: Map(int => [Field]) (NAME is in uppercase)
let db = new Map();
// ranges: [{name: String, first: int, last: int}]
let ranges = [];
// aliases: [{name: String, code: int}]
let aliases = [];
function importDatabase(csv) {
// clear the database if necessary
db = new Map();
ranges = [];
let currentRange = null;
let cursor = 0, endidx;
while ((endidx = csv.indexOf("\n", cursor)) != -1) {
const row = csv.slice(cursor, endidx).split(";");
cursor = endidx + 1;
const code = parseInt(row[fCODE], 16);
const m = row[fNAME].match(/^<(.*), (First|Last)>$/)
if (m != null) {
if (m[2] == "First") {
row[fNAME] = "<" + m[1] + ">";
currentRange = {name: m[1], first: code, last: null, row: row};
} else if (currentRange != null && m[1] == currentRange.name) {
currentRange.last = code;
ranges.push(currentRange);
currentRange = null;
}
} else {
row[fNAME] = row[fNAME].toUpperCase();
db.set(code, row);
}
}
}
function importAliases(lines) {
aliases = [];
for (const line of lines.split("\n")) {
const idx = line.indexOf(" ");
if (idx == -1) continue;
const num = parseInt(line.slice(0, idx));
const descr = line.slice(idx + 1).toUpperCase();
aliases.push({name: descr, code: num});
}
}
function lookupCode(codepoint) {
for (const range of ranges) {
if (range.first <= codepoint && codepoint <= range.last) {
const row = range.row.slice();
row[fCODE] = codepoint.toString(16).toUpperCase();
return row;
}
}
return db.get(codepoint);
}
function searchDescription(text) {
text = text.toUpperCase();
const result = [];
for (const row of db.values()) {
if (row[fNAME].includes(text)) {
result.push(row);
if (result.length >= 500) return result;
}
}
for (const row of aliases) {
if (row.name.includes(text)) {
result.push(db.get(row.code));
if (result.length >= 500) return result;
}
}
return result;
}
function recogniseIndices(text) {
const results = [];
// A: 1234 (decimal)
// B: 0x34ab / U+34ab (hexadecimal)
// C: Ӓ (xml-style decimal)
// D: 㒫 (xml-style hexadecimal)
// within word boundaries.
// AAAAAA BBBBBBBBBBBBBBBBBBBBBBBBBBBBBB CCCCCCCCCCC DDDDDDDDDDDDDDDDDDDDD
const regex = /\b([0-9]+|(?:0[Xx]|[Uu]\+)([0-9a-fA-F]+)|&#([0-9]+);|&#[Xx]([0-9a-fA-F]+);)\b/g;
const matches = text.match(regex);
if (matches == null) return [];
for (const m of matches) {
let code = -1;
if ("Xx+".indexOf(m[1]) != -1) { // hexadecimal
code = parseInt(m.slice(2), 16);
} else if (m[0] == "&" && "Xx".indexOf(m[2]) != -1) { // xml-style hexadecimal
code = parseInt(m.slice(3, -1), 16);
} else if (m[0] == "&") { // xml-style decimal
code = parseInt(m.slice(2, -1), 10);
} else { // decimal
code = parseInt(m, 10);
}
const row = lookupCode(code);
if (row != null) results.push(row);
}
return results;
}
module.exports = function (app, io, moddir) {
const dataFilePath = path.join(moddir, "UnicodeData.txt");
if (fs.existsSync(dataFilePath)) {
importDatabase(fs.readFileSync(dataFilePath).toString());
} else {
throw new Error("UnicodeData.txt doesn't exist! Be sure to run ./install_prepare.sh");
}
importAliases(fs.readFileSync(path.join(moddir, "aliases.txt")).toString());
app.get("/unicode", (req, res) => {
res.sendFile(path.join(moddir, "index.html"));
});
app.get("/unicode/lookup/:query", (req, res) => {
const codepoints = [];
let notfound = "";
for (let codepoint of req.params.query) {
codepoint = codepoint.codePointAt(0);
const result = lookupCode(codepoint);
if (result != null) codepoints.push(result);
else notfound += String.fromCodePoint(codepoint);
}
res.json({
indices: recogniseIndices(req.params.query),
codepoints: codepoints,
notfound: notfound,
search: searchDescription(req.params.query),
});
});
};
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