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87 lines
1.6 KiB
87 lines
1.6 KiB
'use strict';
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// https://github.com/eslint/espree/blob/6b7d0b8100537dcd5c84a7fb17bbe28edcabe05d/lib/token-translator.js#L20
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const tokenTypesNeedsSemicolon = new Set([
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'String',
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'Null',
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'Boolean',
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'Numeric',
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'RegularExpression'
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]);
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const charactersMightNeedsSemicolon = new Set([
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'[',
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'(',
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'/',
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'`',
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'+',
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'-',
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'*',
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',',
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'.'
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]);
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/**
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Determines if a semicolon needs to be inserted before `code`, in order to avoid a SyntaxError.
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@param {Token} tokenBefore Token before `code`.
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@param {SourceCode} sourceCode
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@param {String} [code] Code text to determine.
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@returns {boolean} `true` if a semicolon needs to be inserted before `code`.
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*/
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function needsSemicolon(tokenBefore, sourceCode, code) {
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if (
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code === '' ||
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(code && !charactersMightNeedsSemicolon.has(code.charAt(0)))
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) {
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return false;
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}
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if (!tokenBefore) {
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return false;
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}
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const {type, value} = tokenBefore;
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if (type === 'Punctuator') {
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if (value === ';') {
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return false;
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}
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if (value === ']' || value === ')') {
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return true;
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}
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}
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if (tokenTypesNeedsSemicolon.has(type)) {
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return true;
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}
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if (type === 'Template') {
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return value.endsWith('`');
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}
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const lastBlockNode = sourceCode.getNodeByRangeIndex(tokenBefore.range[0]);
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if (lastBlockNode && lastBlockNode.type === 'ObjectExpression') {
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return true;
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}
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if (type === 'Identifier') {
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// `for...of`
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if (value === 'of' && lastBlockNode && lastBlockNode.type === 'ForOfStatement') {
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return false;
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}
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// `await`
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if (value === 'await' && lastBlockNode && lastBlockNode.type === 'AwaitExpression') {
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return false;
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}
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return true;
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}
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return false;
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}
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module.exports = needsSemicolon;
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