80 lines
2.0 KiB
TypeScript
80 lines
2.0 KiB
TypeScript
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import type { TextDocument, Range, Position } from 'vscode-languageserver'
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export function isValidLocationForEmmetAbbreviation(
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document: TextDocument,
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abbreviationRange: Range
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): boolean {
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const startAngle = '<'
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const endAngle = '>'
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const escape = '\\'
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const question = '?'
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let start: Position = { line: 0, character: 0 }
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let textToBackTrack = document.getText({
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start: {
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line: start.line,
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character: start.character,
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},
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end: {
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line: abbreviationRange.start.line,
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character: abbreviationRange.start.character,
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},
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})
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// Worse case scenario is when cursor is inside a big chunk of text which needs to backtracked
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// Backtrack only 500 offsets to ensure we dont waste time doing this
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if (textToBackTrack.length > 500) {
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textToBackTrack = textToBackTrack.substr(textToBackTrack.length - 500)
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}
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if (!textToBackTrack.trim()) {
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return true
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}
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let valid = true
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let foundSpace = false // If < is found before finding whitespace, then its valid abbreviation. E.g.: <div|
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let i = textToBackTrack.length - 1
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if (textToBackTrack[i] === startAngle) {
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return false
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}
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while (i >= 0) {
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const char = textToBackTrack[i]
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i--
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if (!foundSpace && /\s/.test(char)) {
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foundSpace = true
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continue
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}
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if (char === question && textToBackTrack[i] === startAngle) {
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i--
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continue
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}
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// Fix for https://github.com/Microsoft/vscode/issues/55411
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// A space is not a valid character right after < in a tag name.
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if (/\s/.test(char) && textToBackTrack[i] === startAngle) {
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i--
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continue
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}
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if (char !== startAngle && char !== endAngle) {
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continue
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}
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if (i >= 0 && textToBackTrack[i] === escape) {
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i--
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continue
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}
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if (char === endAngle) {
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if (i >= 0 && textToBackTrack[i] === '=') {
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continue // False alarm of cases like =>
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} else {
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break
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}
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}
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if (char === startAngle) {
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valid = !foundSpace
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break
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}
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}
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return valid
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}
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