import { indexOf } from "../util/misc.js"
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// Find the line object corresponding to the given line number.
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export function getLine(doc, n) {
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n -= doc.first
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if (n < 0 || n >= doc.size) throw new Error("There is no line " + (n + doc.first) + " in the document.")
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let chunk = doc
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while (!chunk.lines) {
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for (let i = 0;; ++i) {
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let child = chunk.children[i], sz = child.chunkSize()
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if (n < sz) { chunk = child; break }
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n -= sz
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}
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}
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return chunk.lines[n]
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}
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// Get the part of a document between two positions, as an array of
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// strings.
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export function getBetween(doc, start, end) {
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let out = [], n = start.line
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doc.iter(start.line, end.line + 1, line => {
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let text = line.text
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if (n == end.line) text = text.slice(0, end.ch)
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if (n == start.line) text = text.slice(start.ch)
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out.push(text)
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++n
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})
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return out
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}
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// Get the lines between from and to, as array of strings.
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export function getLines(doc, from, to) {
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let out = []
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doc.iter(from, to, line => { out.push(line.text) }) // iter aborts when callback returns truthy value
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return out
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}
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// Update the height of a line, propagating the height change
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// upwards to parent nodes.
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export function updateLineHeight(line, height) {
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let diff = height - line.height
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if (diff) for (let n = line; n; n = n.parent) n.height += diff
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}
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// Given a line object, find its line number by walking up through
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// its parent links.
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export function lineNo(line) {
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if (line.parent == null) return null
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let cur = line.parent, no = indexOf(cur.lines, line)
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for (let chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
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for (let i = 0;; ++i) {
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if (chunk.children[i] == cur) break
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no += chunk.children[i].chunkSize()
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}
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}
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return no + cur.first
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}
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// Find the line at the given vertical position, using the height
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// information in the document tree.
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export function lineAtHeight(chunk, h) {
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let n = chunk.first
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outer: do {
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for (let i = 0; i < chunk.children.length; ++i) {
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let child = chunk.children[i], ch = child.height
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if (h < ch) { chunk = child; continue outer }
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h -= ch
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n += child.chunkSize()
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}
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return n
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} while (!chunk.lines)
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let i = 0
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for (; i < chunk.lines.length; ++i) {
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let line = chunk.lines[i], lh = line.height
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if (h < lh) break
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h -= lh
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}
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return n + i
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}
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export function isLine(doc, l) {return l >= doc.first && l < doc.first + doc.size}
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export function lineNumberFor(options, i) {
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return String(options.lineNumberFormatter(i + options.firstLineNumber))
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}
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