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73 lines
2.2 KiB
73 lines
2.2 KiB
/** |
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* @fileoverview Require or disallow Unicode BOM |
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* @author Andrew Johnston <https://github.com/ehjay> |
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*/ |
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"use strict"; |
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//------------------------------------------------------------------------------ |
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// Rule Definition |
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//------------------------------------------------------------------------------ |
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/** @type {import('../shared/types').Rule} */ |
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module.exports = { |
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meta: { |
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type: "layout", |
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docs: { |
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description: "Require or disallow Unicode byte order mark (BOM)", |
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recommended: false, |
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url: "https://eslint.org/docs/rules/unicode-bom" |
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}, |
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fixable: "whitespace", |
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schema: [ |
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{ |
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enum: ["always", "never"] |
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} |
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], |
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messages: { |
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expected: "Expected Unicode BOM (Byte Order Mark).", |
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unexpected: "Unexpected Unicode BOM (Byte Order Mark)." |
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} |
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}, |
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create(context) { |
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//-------------------------------------------------------------------------- |
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// Public |
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//-------------------------------------------------------------------------- |
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return { |
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Program: function checkUnicodeBOM(node) { |
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const sourceCode = context.getSourceCode(), |
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location = { column: 0, line: 1 }, |
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requireBOM = context.options[0] || "never"; |
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if (!sourceCode.hasBOM && (requireBOM === "always")) { |
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context.report({ |
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node, |
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loc: location, |
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messageId: "expected", |
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fix(fixer) { |
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return fixer.insertTextBeforeRange([0, 1], "\uFEFF"); |
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} |
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}); |
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} else if (sourceCode.hasBOM && (requireBOM === "never")) { |
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context.report({ |
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node, |
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loc: location, |
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messageId: "unexpected", |
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fix(fixer) { |
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return fixer.removeRange([-1, 0]); |
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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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