41 lines
1.5 KiB
JavaScript
41 lines
1.5 KiB
JavaScript
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import { getLine } from "./utils_line.js"
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// A Pos instance represents a position within the text.
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export function Pos(line, ch, sticky = null) {
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if (!(this instanceof Pos)) return new Pos(line, ch, sticky)
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this.line = line
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this.ch = ch
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this.sticky = sticky
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}
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// Compare two positions, return 0 if they are the same, a negative
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// number when a is less, and a positive number otherwise.
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export function cmp(a, b) { return a.line - b.line || a.ch - b.ch }
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export function equalCursorPos(a, b) { return a.sticky == b.sticky && cmp(a, b) == 0 }
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export function copyPos(x) {return Pos(x.line, x.ch)}
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export function maxPos(a, b) { return cmp(a, b) < 0 ? b : a }
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export function minPos(a, b) { return cmp(a, b) < 0 ? a : b }
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// Most of the external API clips given positions to make sure they
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// actually exist within the document.
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export function clipLine(doc, n) {return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1))}
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export function clipPos(doc, pos) {
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if (pos.line < doc.first) return Pos(doc.first, 0)
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let last = doc.first + doc.size - 1
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if (pos.line > last) return Pos(last, getLine(doc, last).text.length)
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return clipToLen(pos, getLine(doc, pos.line).text.length)
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}
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function clipToLen(pos, linelen) {
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let ch = pos.ch
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if (ch == null || ch > linelen) return Pos(pos.line, linelen)
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else if (ch < 0) return Pos(pos.line, 0)
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else return pos
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}
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export function clipPosArray(doc, array) {
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let out = []
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for (let i = 0; i < array.length; i++) out[i] = clipPos(doc, array[i])
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return out
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}
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