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1 import { indexOf } from "../util/misc.js"
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2
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3 // Find the line object corresponding to the given line number.
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4 export function getLine(doc, n) {
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5 n -= doc.first
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6 if (n < 0 || n >= doc.size) throw new Error("There is no line " + (n + doc.first) + " in the document.")
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7 let chunk = doc
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8 while (!chunk.lines) {
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9 for (let i = 0;; ++i) {
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10 let child = chunk.children[i], sz = child.chunkSize()
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11 if (n < sz) { chunk = child; break }
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12 n -= sz
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13 }
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14 }
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15 return chunk.lines[n]
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16 }
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17
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18 // Get the part of a document between two positions, as an array of
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19 // strings.
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20 export function getBetween(doc, start, end) {
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21 let out = [], n = start.line
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22 doc.iter(start.line, end.line + 1, line => {
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23 let text = line.text
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24 if (n == end.line) text = text.slice(0, end.ch)
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25 if (n == start.line) text = text.slice(start.ch)
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26 out.push(text)
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27 ++n
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28 })
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29 return out
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30 }
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31 // Get the lines between from and to, as array of strings.
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32 export function getLines(doc, from, to) {
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33 let out = []
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34 doc.iter(from, to, line => { out.push(line.text) }) // iter aborts when callback returns truthy value
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35 return out
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36 }
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37
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38 // Update the height of a line, propagating the height change
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39 // upwards to parent nodes.
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40 export function updateLineHeight(line, height) {
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41 let diff = height - line.height
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42 if (diff) for (let n = line; n; n = n.parent) n.height += diff
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43 }
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44
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45 // Given a line object, find its line number by walking up through
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46 // its parent links.
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47 export function lineNo(line) {
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48 if (line.parent == null) return null
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49 let cur = line.parent, no = indexOf(cur.lines, line)
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50 for (let chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
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51 for (let i = 0;; ++i) {
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52 if (chunk.children[i] == cur) break
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53 no += chunk.children[i].chunkSize()
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54 }
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55 }
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56 return no + cur.first
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57 }
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58
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59 // Find the line at the given vertical position, using the height
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60 // information in the document tree.
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61 export function lineAtHeight(chunk, h) {
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62 let n = chunk.first
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63 outer: do {
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64 for (let i = 0; i < chunk.children.length; ++i) {
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65 let child = chunk.children[i], ch = child.height
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66 if (h < ch) { chunk = child; continue outer }
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67 h -= ch
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68 n += child.chunkSize()
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69 }
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70 return n
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71 } while (!chunk.lines)
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72 let i = 0
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73 for (; i < chunk.lines.length; ++i) {
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74 let line = chunk.lines[i], lh = line.height
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75 if (h < lh) break
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76 h -= lh
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77 }
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78 return n + i
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79 }
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80
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81 export function isLine(doc, l) {return l >= doc.first && l < doc.first + doc.size}
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82
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83 export function lineNumberFor(options, i) {
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84 return String(options.lineNumberFormatter(i + options.firstLineNumber))
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85 }
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