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diff .cms/lib/codemirror/src/input/movement.js @ 0:78edf6b517a0 draft
24.10
author | Coffee CMS <info@coffee-cms.ru> |
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date | Fri, 11 Oct 2024 22:40:23 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/.cms/lib/codemirror/src/input/movement.js Fri Oct 11 22:40:23 2024 +0000 @@ -0,0 +1,111 @@ +import { Pos } from "../line/pos.js" +import { prepareMeasureForLine, measureCharPrepared, wrappedLineExtentChar } from "../measurement/position_measurement.js" +import { getBidiPartAt, getOrder } from "../util/bidi.js" +import { findFirst, lst, skipExtendingChars } from "../util/misc.js" + +function moveCharLogically(line, ch, dir) { + let target = skipExtendingChars(line.text, ch + dir, dir) + return target < 0 || target > line.text.length ? null : target +} + +export function moveLogically(line, start, dir) { + let ch = moveCharLogically(line, start.ch, dir) + return ch == null ? null : new Pos(start.line, ch, dir < 0 ? "after" : "before") +} + +export function endOfLine(visually, cm, lineObj, lineNo, dir) { + if (visually) { + if (cm.doc.direction == "rtl") dir = -dir + let order = getOrder(lineObj, cm.doc.direction) + if (order) { + let part = dir < 0 ? lst(order) : order[0] + let moveInStorageOrder = (dir < 0) == (part.level == 1) + let sticky = moveInStorageOrder ? "after" : "before" + let ch + // With a wrapped rtl chunk (possibly spanning multiple bidi parts), + // it could be that the last bidi part is not on the last visual line, + // since visual lines contain content order-consecutive chunks. + // Thus, in rtl, we are looking for the first (content-order) character + // in the rtl chunk that is on the last line (that is, the same line + // as the last (content-order) character). + if (part.level > 0 || cm.doc.direction == "rtl") { + let prep = prepareMeasureForLine(cm, lineObj) + ch = dir < 0 ? lineObj.text.length - 1 : 0 + let targetTop = measureCharPrepared(cm, prep, ch).top + ch = findFirst(ch => measureCharPrepared(cm, prep, ch).top == targetTop, (dir < 0) == (part.level == 1) ? part.from : part.to - 1, ch) + if (sticky == "before") ch = moveCharLogically(lineObj, ch, 1) + } else ch = dir < 0 ? part.to : part.from + return new Pos(lineNo, ch, sticky) + } + } + return new Pos(lineNo, dir < 0 ? lineObj.text.length : 0, dir < 0 ? "before" : "after") +} + +export function moveVisually(cm, line, start, dir) { + let bidi = getOrder(line, cm.doc.direction) + if (!bidi) return moveLogically(line, start, dir) + if (start.ch >= line.text.length) { + start.ch = line.text.length + start.sticky = "before" + } else if (start.ch <= 0) { + start.ch = 0 + start.sticky = "after" + } + let partPos = getBidiPartAt(bidi, start.ch, start.sticky), part = bidi[partPos] + if (cm.doc.direction == "ltr" && part.level % 2 == 0 && (dir > 0 ? part.to > start.ch : part.from < start.ch)) { + // Case 1: We move within an ltr part in an ltr editor. Even with wrapped lines, + // nothing interesting happens. + return moveLogically(line, start, dir) + } + + let mv = (pos, dir) => moveCharLogically(line, pos instanceof Pos ? pos.ch : pos, dir) + let prep + let getWrappedLineExtent = ch => { + if (!cm.options.lineWrapping) return {begin: 0, end: line.text.length} + prep = prep || prepareMeasureForLine(cm, line) + return wrappedLineExtentChar(cm, line, prep, ch) + } + let wrappedLineExtent = getWrappedLineExtent(start.sticky == "before" ? mv(start, -1) : start.ch) + + if (cm.doc.direction == "rtl" || part.level == 1) { + let moveInStorageOrder = (part.level == 1) == (dir < 0) + let ch = mv(start, moveInStorageOrder ? 1 : -1) + if (ch != null && (!moveInStorageOrder ? ch >= part.from && ch >= wrappedLineExtent.begin : ch <= part.to && ch <= wrappedLineExtent.end)) { + // Case 2: We move within an rtl part or in an rtl editor on the same visual line + let sticky = moveInStorageOrder ? "before" : "after" + return new Pos(start.line, ch, sticky) + } + } + + // Case 3: Could not move within this bidi part in this visual line, so leave + // the current bidi part + + let searchInVisualLine = (partPos, dir, wrappedLineExtent) => { + let getRes = (ch, moveInStorageOrder) => moveInStorageOrder + ? new Pos(start.line, mv(ch, 1), "before") + : new Pos(start.line, ch, "after") + + for (; partPos >= 0 && partPos < bidi.length; partPos += dir) { + let part = bidi[partPos] + let moveInStorageOrder = (dir > 0) == (part.level != 1) + let ch = moveInStorageOrder ? wrappedLineExtent.begin : mv(wrappedLineExtent.end, -1) + if (part.from <= ch && ch < part.to) return getRes(ch, moveInStorageOrder) + ch = moveInStorageOrder ? part.from : mv(part.to, -1) + if (wrappedLineExtent.begin <= ch && ch < wrappedLineExtent.end) return getRes(ch, moveInStorageOrder) + } + } + + // Case 3a: Look for other bidi parts on the same visual line + let res = searchInVisualLine(partPos + dir, dir, wrappedLineExtent) + if (res) return res + + // Case 3b: Look for other bidi parts on the next visual line + let nextCh = dir > 0 ? wrappedLineExtent.end : mv(wrappedLineExtent.begin, -1) + if (nextCh != null && !(dir > 0 && nextCh == line.text.length)) { + res = searchInVisualLine(dir > 0 ? 0 : bidi.length - 1, dir, getWrappedLineExtent(nextCh)) + if (res) return res + } + + // Case 4: Nowhere to move + return null +}