eslint-plugin-lit
Version:
lit-html support for ESLint
53 lines (52 loc) • 2.4 kB
JavaScript
/**
* @fileoverview Disallows invalid escape sequences in template strings
* @author James Garbutt <https://github.com/43081j>
*/
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
export const rule = {
meta: {
docs: {
description: 'Disallows invalid escape sequences in template strings',
recommended: false,
url: 'https://github.com/43081j/eslint-plugin-lit/blob/master/docs/rules/no-invalid-escape-sequences.md'
},
fixable: 'code',
schema: [],
messages: {
invalid: 'Some escape sequences are invalid in template strings. ' +
'They should either be escaped again (e.g. "\\\\02c") or interpolated'
}
},
create(context) {
const source = context.getSourceCode();
const escapePattern = /(^|[^\\](?:\\\\)*)(\\([1-7][0-7]*|[0-7]{2,}))/g;
return {
TaggedTemplateExpression: (node) => {
if (node.type === 'TaggedTemplateExpression' &&
node.tag.type === 'Identifier' &&
node.tag.name === 'html') {
for (const quasi of node.quasi.quasis) {
if (quasi.range) {
const results = quasi.value.raw.matchAll(escapePattern);
for (const match of results) {
if (match.index !== undefined) {
const rangeStart = quasi.range[0] + 1 + match.index + match[1].length;
const rangeEnd = rangeStart + match[2].length;
const start = source.getLocFromIndex(rangeStart);
const end = source.getLocFromIndex(rangeEnd);
context.report({
loc: { start, end },
messageId: 'invalid',
fix: (fixer) => fixer.insertTextBeforeRange([rangeStart, rangeEnd], '\\')
});
}
}
}
}
}
}
};
}
};