Opal-Estate-Pro/node_modules/babylon/bin/generate-identifier-regex.js
2019-09-13 11:27:52 +07:00

63 lines
1.8 KiB
JavaScript
Executable File

"use strict";
// Which Unicode version should be used?
const version = "9.0.0";
const start = require("unicode-" + version + "/Binary_Property/ID_Start/code-points.js")
.filter(function(ch) { return ch > 0x7f; });
let last = -1;
const cont = [0x200c, 0x200d].concat(
require("unicode-" + version + "/Binary_Property/ID_Continue/code-points.js")
.filter(function(ch) {
return ch > 0x7f && search(start, ch, last + 1) == -1;
})
);
function search(arr, ch, starting) {
for (let i = starting; arr[i] <= ch && i < arr.length; last = i++)
if (arr[i] === ch)
return i;
return -1;
}
function pad(str, width) {
while (str.length < width) str = "0" + str;
return str;
}
function esc(code) {
const hex = code.toString(16);
if (hex.length <= 2) return "\\x" + pad(hex, 2);
else return "\\u" + pad(hex, 4);
}
function generate(chars) {
const astral = [];
let re = "";
for (let i = 0, at = 0x10000; i < chars.length; i++) {
const from = chars[i];
let to = from;
while (i < chars.length - 1 && chars[i + 1] == to + 1) {
i++;
to++;
}
if (to <= 0xffff) {
if (from == to) re += esc(from);
else if (from + 1 == to) re += esc(from) + esc(to);
else re += esc(from) + "-" + esc(to);
} else {
astral.push(from - at, to - from);
at = to;
}
}
return { nonASCII: re, astral: astral };
}
const startData = generate(start);
const contData = generate(cont);
console.log("let nonASCIIidentifierStartChars = \"" + startData.nonASCII + "\";");
console.log("let nonASCIIidentifierChars = \"" + contData.nonASCII + "\";");
console.log("const astralIdentifierStartCodes = " + JSON.stringify(startData.astral) + ";");
console.log("const astralIdentifierCodes = " + JSON.stringify(contData.astral) + ";");