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