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1 import { Pos } from "../line/pos.js"
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2 import { prepareMeasureForLine, measureCharPrepared, wrappedLineExtentChar } from "../measurement/position_measurement.js"
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3 import { getBidiPartAt, getOrder } from "../util/bidi.js"
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4 import { findFirst, lst, skipExtendingChars } from "../util/misc.js"
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5
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6 function moveCharLogically(line, ch, dir) {
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7 let target = skipExtendingChars(line.text, ch + dir, dir)
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8 return target < 0 || target > line.text.length ? null : target
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9 }
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10
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11 export function moveLogically(line, start, dir) {
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12 let ch = moveCharLogically(line, start.ch, dir)
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13 return ch == null ? null : new Pos(start.line, ch, dir < 0 ? "after" : "before")
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14 }
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15
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16 export function endOfLine(visually, cm, lineObj, lineNo, dir) {
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17 if (visually) {
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18 if (cm.doc.direction == "rtl") dir = -dir
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19 let order = getOrder(lineObj, cm.doc.direction)
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20 if (order) {
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21 let part = dir < 0 ? lst(order) : order[0]
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22 let moveInStorageOrder = (dir < 0) == (part.level == 1)
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23 let sticky = moveInStorageOrder ? "after" : "before"
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24 let ch
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25 // With a wrapped rtl chunk (possibly spanning multiple bidi parts),
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26 // it could be that the last bidi part is not on the last visual line,
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27 // since visual lines contain content order-consecutive chunks.
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28 // Thus, in rtl, we are looking for the first (content-order) character
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29 // in the rtl chunk that is on the last line (that is, the same line
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30 // as the last (content-order) character).
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31 if (part.level > 0 || cm.doc.direction == "rtl") {
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32 let prep = prepareMeasureForLine(cm, lineObj)
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33 ch = dir < 0 ? lineObj.text.length - 1 : 0
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34 let targetTop = measureCharPrepared(cm, prep, ch).top
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35 ch = findFirst(ch => measureCharPrepared(cm, prep, ch).top == targetTop, (dir < 0) == (part.level == 1) ? part.from : part.to - 1, ch)
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36 if (sticky == "before") ch = moveCharLogically(lineObj, ch, 1)
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37 } else ch = dir < 0 ? part.to : part.from
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38 return new Pos(lineNo, ch, sticky)
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39 }
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40 }
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41 return new Pos(lineNo, dir < 0 ? lineObj.text.length : 0, dir < 0 ? "before" : "after")
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42 }
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43
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44 export function moveVisually(cm, line, start, dir) {
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45 let bidi = getOrder(line, cm.doc.direction)
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46 if (!bidi) return moveLogically(line, start, dir)
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47 if (start.ch >= line.text.length) {
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48 start.ch = line.text.length
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49 start.sticky = "before"
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50 } else if (start.ch <= 0) {
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51 start.ch = 0
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52 start.sticky = "after"
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53 }
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54 let partPos = getBidiPartAt(bidi, start.ch, start.sticky), part = bidi[partPos]
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55 if (cm.doc.direction == "ltr" && part.level % 2 == 0 && (dir > 0 ? part.to > start.ch : part.from < start.ch)) {
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56 // Case 1: We move within an ltr part in an ltr editor. Even with wrapped lines,
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57 // nothing interesting happens.
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58 return moveLogically(line, start, dir)
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59 }
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60
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61 let mv = (pos, dir) => moveCharLogically(line, pos instanceof Pos ? pos.ch : pos, dir)
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62 let prep
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63 let getWrappedLineExtent = ch => {
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64 if (!cm.options.lineWrapping) return {begin: 0, end: line.text.length}
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65 prep = prep || prepareMeasureForLine(cm, line)
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66 return wrappedLineExtentChar(cm, line, prep, ch)
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67 }
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68 let wrappedLineExtent = getWrappedLineExtent(start.sticky == "before" ? mv(start, -1) : start.ch)
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69
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70 if (cm.doc.direction == "rtl" || part.level == 1) {
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71 let moveInStorageOrder = (part.level == 1) == (dir < 0)
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72 let ch = mv(start, moveInStorageOrder ? 1 : -1)
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73 if (ch != null && (!moveInStorageOrder ? ch >= part.from && ch >= wrappedLineExtent.begin : ch <= part.to && ch <= wrappedLineExtent.end)) {
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74 // Case 2: We move within an rtl part or in an rtl editor on the same visual line
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75 let sticky = moveInStorageOrder ? "before" : "after"
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76 return new Pos(start.line, ch, sticky)
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77 }
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78 }
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79
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80 // Case 3: Could not move within this bidi part in this visual line, so leave
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81 // the current bidi part
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82
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83 let searchInVisualLine = (partPos, dir, wrappedLineExtent) => {
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84 let getRes = (ch, moveInStorageOrder) => moveInStorageOrder
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85 ? new Pos(start.line, mv(ch, 1), "before")
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86 : new Pos(start.line, ch, "after")
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87
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88 for (; partPos >= 0 && partPos < bidi.length; partPos += dir) {
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89 let part = bidi[partPos]
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90 let moveInStorageOrder = (dir > 0) == (part.level != 1)
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91 let ch = moveInStorageOrder ? wrappedLineExtent.begin : mv(wrappedLineExtent.end, -1)
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92 if (part.from <= ch && ch < part.to) return getRes(ch, moveInStorageOrder)
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93 ch = moveInStorageOrder ? part.from : mv(part.to, -1)
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94 if (wrappedLineExtent.begin <= ch && ch < wrappedLineExtent.end) return getRes(ch, moveInStorageOrder)
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95 }
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96 }
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97
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98 // Case 3a: Look for other bidi parts on the same visual line
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99 let res = searchInVisualLine(partPos + dir, dir, wrappedLineExtent)
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100 if (res) return res
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101
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102 // Case 3b: Look for other bidi parts on the next visual line
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103 let nextCh = dir > 0 ? wrappedLineExtent.end : mv(wrappedLineExtent.begin, -1)
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104 if (nextCh != null && !(dir > 0 && nextCh == line.text.length)) {
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105 res = searchInVisualLine(dir > 0 ? 0 : bidi.length - 1, dir, getWrappedLineExtent(nextCh))
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106 if (res) return res
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107 }
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108
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109 // Case 4: Nowhere to move
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110 return null
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111 }
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