101 lines
3.5 KiB
JavaScript
101 lines
3.5 KiB
JavaScript
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/**
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* @author Toru Nagashima <https://github.com/mysticatea>
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* See LICENSE file in root directory for full license.
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*/
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"use strict"
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const { definePatternSearchGenerator } = require("../utils")
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const codePointEscapeSearchGenerator = definePatternSearchGenerator(
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/\\u\{[0-9a-fA-F]+\}/gu
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)
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/**
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* Number to Hex
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* @param {number} num number
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* @returns {string} hex string
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*/
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function toHex(num) {
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return `0000${num.toString(16).toUpperCase()}`.substr(-4)
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}
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module.exports = {
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meta: {
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docs: {
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description: "disallow Unicode code point escape sequences.",
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category: "ES2015",
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recommended: false,
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url:
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"http://mysticatea.github.io/eslint-plugin-es/rules/no-unicode-codepoint-escapes.html",
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},
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fixable: "code",
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messages: {
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forbidden:
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"ES2015 Unicode code point escape sequences are forbidden.",
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},
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schema: [],
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type: "problem",
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},
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create(context) {
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const sourceCode = context.getSourceCode()
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/**
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* find code point escape, and report
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* @param {string} text text
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* @param {Node} node node
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* @returns {void}
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*/
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function findAndReport(text, node) {
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for (const match of codePointEscapeSearchGenerator(text)) {
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const start = match.index
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const end = start + match[0].length
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const range = [start + node.start, end + node.start]
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context.report({
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node,
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loc: {
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start: sourceCode.getLocFromIndex(range[0]),
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end: sourceCode.getLocFromIndex(range[1]),
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},
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messageId: "forbidden",
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fix(fixer) {
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const codePointStr = text.slice(start + 3, end - 1)
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// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCodePoint
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let codePoint = Number(`0x${codePointStr}`)
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let replacement = null
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if (codePoint <= 0xffff) {
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// BMP code point
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replacement = toHex(codePoint)
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} else {
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// Astral code point; split in surrogate halves
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// http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
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codePoint -= 0x10000
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const highSurrogate = (codePoint >> 10) + 0xd800
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const lowSurrogate = (codePoint % 0x400) + 0xdc00
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replacement = `${toHex(highSurrogate)}\\u${toHex(
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lowSurrogate
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)}`
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}
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return fixer.replaceTextRange(
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[range[0] + 2, range[1]],
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replacement
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)
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},
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})
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}
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}
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return {
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Identifier(node) {
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findAndReport(sourceCode.getText(node), node)
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},
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Literal(node) {
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if (typeof node.value === "string") {
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findAndReport(node.raw, node)
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}
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},
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TemplateElement(elementNode) {
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findAndReport(elementNode.value.raw, elementNode)
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},
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}
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},
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}
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