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