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