85 lines
2.4 KiB
JavaScript
85 lines
2.4 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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/**
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* Checks whether it is string literal
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* @param {string} s string source code
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* @returns {boolean} true: is string literal source code
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*/
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function isStringLiteralCode(s) {
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return (
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(s.startsWith("'") && s.endsWith("'")) ||
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(s.startsWith('"') && s.endsWith('"'))
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)
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}
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/**
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* Transform template literal to string concatenation.
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* @param {ASTNode} node TemplateLiteral node.(not within TaggedTemplateExpression)
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* @param {SourceCode} sourceCode SourceCode
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* @returns {string} After transformation
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*/
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function templateLiteralToStringConcat(node, sourceCode) {
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const ss = []
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node.quasis.forEach((q, i) => {
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const value = q.value.cooked
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if (value) {
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ss.push(JSON.stringify(value))
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}
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if (i < node.expressions.length) {
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const e = node.expressions[i]
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const text = sourceCode.getText(e)
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ss.push(text)
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}
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})
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if (!ss.length || !isStringLiteralCode(ss[0])) {
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ss.unshift(`""`)
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}
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return ss.join("+")
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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 template literals.",
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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-template-literals.html",
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},
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fixable: "code",
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schema: [],
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messages: {
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forbidden: "ES2015 template literals are forbidden.",
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},
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},
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create(context) {
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const sourceCode = context.getSourceCode()
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return {
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"TaggedTemplateExpression, :not(TaggedTemplateExpression) > TemplateLiteral"(
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node
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) {
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context.report({
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node,
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messageId: "forbidden",
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fix:
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node.type === "TemplateLiteral"
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? fixer =>
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fixer.replaceText(
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node,
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templateLiteralToStringConcat(
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node,
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sourceCode
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)
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)
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: undefined,
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})
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},
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}
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},
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}
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