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Copy pathtextObjects.ts
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186 lines (165 loc) · 4.91 KB
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/**
* Vim Text Object Finding
*
* Functions for finding text object boundaries (iw, aw, i", a(, etc.)
*/
import {
isVimPunctuation,
isVimWhitespace,
isVimWordChar,
} from '../utils/Cursor.js'
import { getGraphemeSegmenter } from '../utils/intl.js'
export type TextObjectRange = { start: number; end: number } | null
/**
* Delimiter pairs for text objects.
*/
const PAIRS: Record<string, [string, string]> = {
'(': ['(', ')'],
')': ['(', ')'],
b: ['(', ')'],
'[': ['[', ']'],
']': ['[', ']'],
'{': ['{', '}'],
'}': ['{', '}'],
B: ['{', '}'],
'<': ['<', '>'],
'>': ['<', '>'],
'"': ['"', '"'],
"'": ["'", "'"],
'`': ['`', '`'],
}
/**
* Find a text object at the given position.
*/
export function findTextObject(
text: string,
offset: number,
objectType: string,
isInner: boolean,
): TextObjectRange {
if (objectType === 'w')
return findWordObject(text, offset, isInner, isVimWordChar)
if (objectType === 'W')
return findWordObject(text, offset, isInner, ch => !isVimWhitespace(ch))
const pair = PAIRS[objectType]
if (pair) {
const [open, close] = pair
return open === close
? findQuoteObject(text, offset, open, isInner)
: findBracketObject(text, offset, open, close, isInner)
}
return null
}
function findWordObject(
text: string,
offset: number,
isInner: boolean,
isWordChar: (ch: string) => boolean,
): TextObjectRange {
// Pre-segment into graphemes for grapheme-safe iteration
const graphemes: Array<{ segment: string; index: number }> = []
for (const { segment, index } of getGraphemeSegmenter().segment(text)) {
graphemes.push({ segment, index })
}
// Find which grapheme index the offset falls in
let graphemeIdx = graphemes.length - 1
for (let i = 0; i < graphemes.length; i++) {
const g = graphemes[i]!
const nextStart =
i + 1 < graphemes.length ? graphemes[i + 1]!.index : text.length
if (offset >= g.index && offset < nextStart) {
graphemeIdx = i
break
}
}
const graphemeAt = (idx: number): string => graphemes[idx]?.segment ?? ''
const offsetAt = (idx: number): number =>
idx < graphemes.length ? graphemes[idx]!.index : text.length
const isWs = (idx: number): boolean => isVimWhitespace(graphemeAt(idx))
const isWord = (idx: number): boolean => isWordChar(graphemeAt(idx))
const isPunct = (idx: number): boolean => isVimPunctuation(graphemeAt(idx))
let startIdx = graphemeIdx
let endIdx = graphemeIdx
if (isWord(graphemeIdx)) {
while (startIdx > 0 && isWord(startIdx - 1)) startIdx--
while (endIdx < graphemes.length && isWord(endIdx)) endIdx++
} else if (isWs(graphemeIdx)) {
while (startIdx > 0 && isWs(startIdx - 1)) startIdx--
while (endIdx < graphemes.length && isWs(endIdx)) endIdx++
return { start: offsetAt(startIdx), end: offsetAt(endIdx) }
} else if (isPunct(graphemeIdx)) {
while (startIdx > 0 && isPunct(startIdx - 1)) startIdx--
while (endIdx < graphemes.length && isPunct(endIdx)) endIdx++
}
if (!isInner) {
// Include surrounding whitespace
if (endIdx < graphemes.length && isWs(endIdx)) {
while (endIdx < graphemes.length && isWs(endIdx)) endIdx++
} else if (startIdx > 0 && isWs(startIdx - 1)) {
while (startIdx > 0 && isWs(startIdx - 1)) startIdx--
}
}
return { start: offsetAt(startIdx), end: offsetAt(endIdx) }
}
function findQuoteObject(
text: string,
offset: number,
quote: string,
isInner: boolean,
): TextObjectRange {
const lineStart = text.lastIndexOf('\n', offset - 1) + 1
const lineEnd = text.indexOf('\n', offset)
const effectiveEnd = lineEnd === -1 ? text.length : lineEnd
const line = text.slice(lineStart, effectiveEnd)
const posInLine = offset - lineStart
const positions: number[] = []
for (let i = 0; i < line.length; i++) {
if (line[i] === quote) positions.push(i)
}
// Pair quotes correctly: 0-1, 2-3, 4-5, etc.
for (let i = 0; i < positions.length - 1; i += 2) {
const qs = positions[i]!
const qe = positions[i + 1]!
if (qs <= posInLine && posInLine <= qe) {
return isInner
? { start: lineStart + qs + 1, end: lineStart + qe }
: { start: lineStart + qs, end: lineStart + qe + 1 }
}
}
return null
}
function findBracketObject(
text: string,
offset: number,
open: string,
close: string,
isInner: boolean,
): TextObjectRange {
let depth = 0
let start = -1
for (let i = offset; i >= 0; i--) {
if (text[i] === close && i !== offset) depth++
else if (text[i] === open) {
if (depth === 0) {
start = i
break
}
depth--
}
}
if (start === -1) return null
depth = 0
let end = -1
for (let i = start + 1; i < text.length; i++) {
if (text[i] === open) depth++
else if (text[i] === close) {
if (depth === 0) {
end = i
break
}
depth--
}
}
if (end === -1) return null
return isInner ? { start: start + 1, end } : { start, end: end + 1 }
}