import { buildLineContent, LineView } from "../line/line_data.js"
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import { clipPos, Pos } from "../line/pos.js"
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import { collapsedSpanAround, heightAtLine, lineIsHidden, visualLine } from "../line/spans.js"
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import { getLine, lineAtHeight, lineNo, updateLineHeight } from "../line/utils_line.js"
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import { bidiOther, getBidiPartAt, getOrder } from "../util/bidi.js"
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import { chrome, android, ie, ie_version } from "../util/browser.js"
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import { elt, removeChildren, range, removeChildrenAndAdd } from "../util/dom.js"
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import { e_target } from "../util/event.js"
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import { hasBadZoomedRects } from "../util/feature_detection.js"
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import { countColumn, findFirst, isExtendingChar, scrollerGap, skipExtendingChars } from "../util/misc.js"
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import { updateLineForChanges } from "../display/update_line.js"
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import { widgetHeight } from "./widgets.js"
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// POSITION MEASUREMENT
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export function paddingTop(display) {return display.lineSpace.offsetTop}
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export function paddingVert(display) {return display.mover.offsetHeight - display.lineSpace.offsetHeight}
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export function paddingH(display) {
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if (display.cachedPaddingH) return display.cachedPaddingH
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let e = removeChildrenAndAdd(display.measure, elt("pre", "x"))
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let style = window.getComputedStyle ? window.getComputedStyle(e) : e.currentStyle
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let data = {left: parseInt(style.paddingLeft), right: parseInt(style.paddingRight)}
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if (!isNaN(data.left) && !isNaN(data.right)) display.cachedPaddingH = data
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return data
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}
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export function scrollGap(cm) { return scrollerGap - cm.display.nativeBarWidth }
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export function displayWidth(cm) {
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return cm.display.scroller.clientWidth - scrollGap(cm) - cm.display.barWidth
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}
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export function displayHeight(cm) {
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return cm.display.scroller.clientHeight - scrollGap(cm) - cm.display.barHeight
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}
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// Ensure the lineView.wrapping.heights array is populated. This is
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// an array of bottom offsets for the lines that make up a drawn
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// line. When lineWrapping is on, there might be more than one
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// height.
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function ensureLineHeights(cm, lineView, rect) {
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let wrapping = cm.options.lineWrapping
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let curWidth = wrapping && displayWidth(cm)
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if (!lineView.measure.heights || wrapping && lineView.measure.width != curWidth) {
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let heights = lineView.measure.heights = []
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if (wrapping) {
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lineView.measure.width = curWidth
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let rects = lineView.text.firstChild.getClientRects()
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for (let i = 0; i < rects.length - 1; i++) {
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let cur = rects[i], next = rects[i + 1]
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if (Math.abs(cur.bottom - next.bottom) > 2)
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heights.push((cur.bottom + next.top) / 2 - rect.top)
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}
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}
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heights.push(rect.bottom - rect.top)
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}
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}
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// Find a line map (mapping character offsets to text nodes) and a
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// measurement cache for the given line number. (A line view might
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// contain multiple lines when collapsed ranges are present.)
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export function mapFromLineView(lineView, line, lineN) {
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if (lineView.line == line)
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return {map: lineView.measure.map, cache: lineView.measure.cache}
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for (let i = 0; i < lineView.rest.length; i++)
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if (lineView.rest[i] == line)
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return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i]}
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for (let i = 0; i < lineView.rest.length; i++)
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if (lineNo(lineView.rest[i]) > lineN)
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return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i], before: true}
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}
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// Render a line into the hidden node display.externalMeasured. Used
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// when measurement is needed for a line that's not in the viewport.
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function updateExternalMeasurement(cm, line) {
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line = visualLine(line)
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let lineN = lineNo(line)
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let view = cm.display.externalMeasured = new LineView(cm.doc, line, lineN)
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view.lineN = lineN
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let built = view.built = buildLineContent(cm, view)
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view.text = built.pre
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removeChildrenAndAdd(cm.display.lineMeasure, built.pre)
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return view
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}
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// Get a {top, bottom, left, right} box (in line-local coordinates)
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// for a given character.
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export function measureChar(cm, line, ch, bias) {
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return measureCharPrepared(cm, prepareMeasureForLine(cm, line), ch, bias)
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}
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// Find a line view that corresponds to the given line number.
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export function findViewForLine(cm, lineN) {
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if (lineN >= cm.display.viewFrom && lineN < cm.display.viewTo)
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return cm.display.view[findViewIndex(cm, lineN)]
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let ext = cm.display.externalMeasured
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if (ext && lineN >= ext.lineN && lineN < ext.lineN + ext.size)
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return ext
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}
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// Measurement can be split in two steps, the set-up work that
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// applies to the whole line, and the measurement of the actual
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// character. Functions like coordsChar, that need to do a lot of
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// measurements in a row, can thus ensure that the set-up work is
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// only done once.
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export function prepareMeasureForLine(cm, line) {
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let lineN = lineNo(line)
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let view = findViewForLine(cm, lineN)
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if (view && !view.text) {
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view = null
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} else if (view && view.changes) {
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updateLineForChanges(cm, view, lineN, getDimensions(cm))
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cm.curOp.forceUpdate = true
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}
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if (!view)
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view = updateExternalMeasurement(cm, line)
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let info = mapFromLineView(view, line, lineN)
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return {
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line: line, view: view, rect: null,
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map: info.map, cache: info.cache, before: info.before,
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hasHeights: false
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}
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}
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// Given a prepared measurement object, measures the position of an
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// actual character (or fetches it from the cache).
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export function measureCharPrepared(cm, prepared, ch, bias, varHeight) {
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if (prepared.before) ch = -1
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let key = ch + (bias || ""), found
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if (prepared.cache.hasOwnProperty(key)) {
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found = prepared.cache[key]
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} else {
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if (!prepared.rect)
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prepared.rect = prepared.view.text.getBoundingClientRect()
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if (!prepared.hasHeights) {
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ensureLineHeights(cm, prepared.view, prepared.rect)
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prepared.hasHeights = true
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}
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found = measureCharInner(cm, prepared, ch, bias)
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if (!found.bogus) prepared.cache[key] = found
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}
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return {left: found.left, right: found.right,
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top: varHeight ? found.rtop : found.top,
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bottom: varHeight ? found.rbottom : found.bottom}
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}
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let nullRect = {left: 0, right: 0, top: 0, bottom: 0}
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export function nodeAndOffsetInLineMap(map, ch, bias) {
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let node, start, end, collapse, mStart, mEnd
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// First, search the line map for the text node corresponding to,
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// or closest to, the target character.
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for (let i = 0; i < map.length; i += 3) {
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mStart = map[i]
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mEnd = map[i + 1]
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if (ch < mStart) {
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start = 0; end = 1
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collapse = "left"
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} else if (ch < mEnd) {
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start = ch - mStart
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end = start + 1
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} else if (i == map.length - 3 || ch == mEnd && map[i + 3] > ch) {
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end = mEnd - mStart
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start = end - 1
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if (ch >= mEnd) collapse = "right"
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}
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if (start != null) {
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node = map[i + 2]
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if (mStart == mEnd && bias == (node.insertLeft ? "left" : "right"))
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collapse = bias
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if (bias == "left" && start == 0)
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while (i && map[i - 2] == map[i - 3] && map[i - 1].insertLeft) {
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node = map[(i -= 3) + 2]
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collapse = "left"
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}
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if (bias == "right" && start == mEnd - mStart)
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while (i < map.length - 3 && map[i + 3] == map[i + 4] && !map[i + 5].insertLeft) {
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node = map[(i += 3) + 2]
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collapse = "right"
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}
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break
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}
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}
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return {node: node, start: start, end: end, collapse: collapse, coverStart: mStart, coverEnd: mEnd}
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}
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function getUsefulRect(rects, bias) {
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let rect = nullRect
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if (bias == "left") for (let i = 0; i < rects.length; i++) {
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if ((rect = rects[i]).left != rect.right) break
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} else for (let i = rects.length - 1; i >= 0; i--) {
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if ((rect = rects[i]).left != rect.right) break
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}
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return rect
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}
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function measureCharInner(cm, prepared, ch, bias) {
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let place = nodeAndOffsetInLineMap(prepared.map, ch, bias)
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let node = place.node, start = place.start, end = place.end, collapse = place.collapse
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let rect
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if (node.nodeType == 3) { // If it is a text node, use a range to retrieve the coordinates.
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for (let i = 0; i < 4; i++) { // Retry a maximum of 4 times when nonsense rectangles are returned
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while (start && isExtendingChar(prepared.line.text.charAt(place.coverStart + start))) --start
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while (place.coverStart + end < place.coverEnd && isExtendingChar(prepared.line.text.charAt(place.coverStart + end))) ++end
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if (ie && ie_version < 9 && start == 0 && end == place.coverEnd - place.coverStart)
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rect = node.parentNode.getBoundingClientRect()
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else
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rect = getUsefulRect(range(node, start, end).getClientRects(), bias)
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if (rect.left || rect.right || start == 0) break
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end = start
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start = start - 1
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collapse = "right"
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}
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if (ie && ie_version < 11) rect = maybeUpdateRectForZooming(cm.display.measure, rect)
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} else { // If it is a widget, simply get the box for the whole widget.
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if (start > 0) collapse = bias = "right"
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let rects
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if (cm.options.lineWrapping && (rects = node.getClientRects()).length > 1)
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rect = rects[bias == "right" ? rects.length - 1 : 0]
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else
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rect = node.getBoundingClientRect()
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}
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if (ie && ie_version < 9 && !start && (!rect || !rect.left && !rect.right)) {
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let rSpan = node.parentNode.getClientRects()[0]
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if (rSpan)
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rect = {left: rSpan.left, right: rSpan.left + charWidth(cm.display), top: rSpan.top, bottom: rSpan.bottom}
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else
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rect = nullRect
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}
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let rtop = rect.top - prepared.rect.top, rbot = rect.bottom - prepared.rect.top
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let mid = (rtop + rbot) / 2
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let heights = prepared.view.measure.heights
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let i = 0
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for (; i < heights.length - 1; i++)
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if (mid < heights[i]) break
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let top = i ? heights[i - 1] : 0, bot = heights[i]
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let result = {left: (collapse == "right" ? rect.right : rect.left) - prepared.rect.left,
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right: (collapse == "left" ? rect.left : rect.right) - prepared.rect.left,
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top: top, bottom: bot}
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if (!rect.left && !rect.right) result.bogus = true
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if (!cm.options.singleCursorHeightPerLine) { result.rtop = rtop; result.rbottom = rbot }
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return result
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}
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// Work around problem with bounding client rects on ranges being
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// returned incorrectly when zoomed on IE10 and below.
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function maybeUpdateRectForZooming(measure, rect) {
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if (!window.screen || screen.logicalXDPI == null ||
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screen.logicalXDPI == screen.deviceXDPI || !hasBadZoomedRects(measure))
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return rect
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let scaleX = screen.logicalXDPI / screen.deviceXDPI
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let scaleY = screen.logicalYDPI / screen.deviceYDPI
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return {left: rect.left * scaleX, right: rect.right * scaleX,
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top: rect.top * scaleY, bottom: rect.bottom * scaleY}
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}
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export function clearLineMeasurementCacheFor(lineView) {
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if (lineView.measure) {
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lineView.measure.cache = {}
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lineView.measure.heights = null
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if (lineView.rest) for (let i = 0; i < lineView.rest.length; i++)
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lineView.measure.caches[i] = {}
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}
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}
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export function clearLineMeasurementCache(cm) {
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cm.display.externalMeasure = null
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removeChildren(cm.display.lineMeasure)
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for (let i = 0; i < cm.display.view.length; i++)
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clearLineMeasurementCacheFor(cm.display.view[i])
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}
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export function clearCaches(cm) {
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clearLineMeasurementCache(cm)
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cm.display.cachedCharWidth = cm.display.cachedTextHeight = cm.display.cachedPaddingH = null
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if (!cm.options.lineWrapping) cm.display.maxLineChanged = true
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cm.display.lineNumChars = null
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}
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function pageScrollX() {
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// Work around https://bugs.chromium.org/p/chromium/issues/detail?id=489206
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// which causes page_Offset and bounding client rects to use
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// different reference viewports and invalidate our calculations.
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if (chrome && android) return -(document.body.getBoundingClientRect().left - parseInt(getComputedStyle(document.body).marginLeft))
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return window.pageXOffset || (document.documentElement || document.body).scrollLeft
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}
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function pageScrollY() {
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if (chrome && android) return -(document.body.getBoundingClientRect().top - parseInt(getComputedStyle(document.body).marginTop))
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return window.pageYOffset || (document.documentElement || document.body).scrollTop
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}
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function widgetTopHeight(lineObj) {
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let height = 0
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if (lineObj.widgets) for (let i = 0; i < lineObj.widgets.length; ++i) if (lineObj.widgets[i].above)
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height += widgetHeight(lineObj.widgets[i])
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return height
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}
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// Converts a {top, bottom, left, right} box from line-local
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// coordinates into another coordinate system. Context may be one of
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// "line", "div" (display.lineDiv), "local"./null (editor), "window",
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// or "page".
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export function intoCoordSystem(cm, lineObj, rect, context, includeWidgets) {
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if (!includeWidgets) {
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let height = widgetTopHeight(lineObj)
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rect.top += height; rect.bottom += height
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}
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if (context == "line") return rect
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if (!context) context = "local"
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let yOff = heightAtLine(lineObj)
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if (context == "local") yOff += paddingTop(cm.display)
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else yOff -= cm.display.viewOffset
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if (context == "page" || context == "window") {
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let lOff = cm.display.lineSpace.getBoundingClientRect()
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yOff += lOff.top + (context == "window" ? 0 : pageScrollY())
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let xOff = lOff.left + (context == "window" ? 0 : pageScrollX())
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rect.left += xOff; rect.right += xOff
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}
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rect.top += yOff; rect.bottom += yOff
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return rect
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}
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// Coverts a box from "div" coords to another coordinate system.
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// Context may be "window", "page", "div", or "local"./null.
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export function fromCoordSystem(cm, coords, context) {
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if (context == "div") return coords
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let left = coords.left, top = coords.top
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// First move into "page" coordinate system
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if (context == "page") {
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left -= pageScrollX()
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top -= pageScrollY()
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} else if (context == "local" || !context) {
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let localBox = cm.display.sizer.getBoundingClientRect()
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left += localBox.left
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top += localBox.top
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}
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let lineSpaceBox = cm.display.lineSpace.getBoundingClientRect()
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return {left: left - lineSpaceBox.left, top: top - lineSpaceBox.top}
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}
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export function charCoords(cm, pos, context, lineObj, bias) {
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if (!lineObj) lineObj = getLine(cm.doc, pos.line)
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return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, bias), context)
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}
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// Returns a box for a given cursor position, which may have an
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// 'other' property containing the position of the secondary cursor
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// on a bidi boundary.
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// A cursor Pos(line, char, "before") is on the same visual line as `char - 1`
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// and after `char - 1` in writing order of `char - 1`
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// A cursor Pos(line, char, "after") is on the same visual line as `char`
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// and before `char` in writing order of `char`
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// Examples (upper-case letters are RTL, lower-case are LTR):
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// Pos(0, 1, ...)
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// before after
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// ab a|b a|b
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// aB a|B aB|
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// Ab |Ab A|b
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// AB B|A B|A
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// Every position after the last character on a line is considered to stick
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// to the last character on the line.
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export function cursorCoords(cm, pos, context, lineObj, preparedMeasure, varHeight) {
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lineObj = lineObj || getLine(cm.doc, pos.line)
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if (!preparedMeasure) preparedMeasure = prepareMeasureForLine(cm, lineObj)
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function get(ch, right) {
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let m = measureCharPrepared(cm, preparedMeasure, ch, right ? "right" : "left", varHeight)
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if (right) m.left = m.right; else m.right = m.left
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return intoCoordSystem(cm, lineObj, m, context)
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}
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let order = getOrder(lineObj, cm.doc.direction), ch = pos.ch, sticky = pos.sticky
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if (ch >= lineObj.text.length) {
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ch = lineObj.text.length
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sticky = "before"
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} else if (ch <= 0) {
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ch = 0
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sticky = "after"
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}
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if (!order) return get(sticky == "before" ? ch - 1 : ch, sticky == "before")
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function getBidi(ch, partPos, invert) {
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let part = order[partPos], right = part.level == 1
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return get(invert ? ch - 1 : ch, right != invert)
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}
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let partPos = getBidiPartAt(order, ch, sticky)
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let other = bidiOther
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let val = getBidi(ch, partPos, sticky == "before")
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if (other != null) val.other = getBidi(ch, other, sticky != "before")
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return val
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}
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// Used to cheaply estimate the coordinates for a position. Used for
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// intermediate scroll updates.
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export function estimateCoords(cm, pos) {
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let left = 0
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pos = clipPos(cm.doc, pos)
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if (!cm.options.lineWrapping) left = charWidth(cm.display) * pos.ch
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let lineObj = getLine(cm.doc, pos.line)
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let top = heightAtLine(lineObj) + paddingTop(cm.display)
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return {left: left, right: left, top: top, bottom: top + lineObj.height}
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}
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// Positions returned by coordsChar contain some extra information.
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// xRel is the relative x position of the input coordinates compared
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// to the found position (so xRel > 0 means the coordinates are to
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// the right of the character position, for example). When outside
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// is true, that means the coordinates lie outside the line's
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// vertical range.
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function PosWithInfo(line, ch, sticky, outside, xRel) {
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let pos = Pos(line, ch, sticky)
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pos.xRel = xRel
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if (outside) pos.outside = true
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return pos
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}
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// Compute the character position closest to the given coordinates.
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// Input must be lineSpace-local ("div" coordinate system).
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export function coordsChar(cm, x, y) {
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let doc = cm.doc
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y += cm.display.viewOffset
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if (y < 0) return PosWithInfo(doc.first, 0, null, true, -1)
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let lineN = lineAtHeight(doc, y), last = doc.first + doc.size - 1
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if (lineN > last)
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return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, null, true, 1)
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if (x < 0) x = 0
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let lineObj = getLine(doc, lineN)
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for (;;) {
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let found = coordsCharInner(cm, lineObj, lineN, x, y)
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let collapsed = collapsedSpanAround(lineObj, found.ch + (found.xRel > 0 ? 1 : 0))
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if (!collapsed) return found
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let rangeEnd = collapsed.find(1)
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if (rangeEnd.line == lineN) return rangeEnd
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lineObj = getLine(doc, lineN = rangeEnd.line)
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}
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}
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function wrappedLineExtent(cm, lineObj, preparedMeasure, y) {
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y -= widgetTopHeight(lineObj)
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let end = lineObj.text.length
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let begin = findFirst(ch => measureCharPrepared(cm, preparedMeasure, ch - 1).bottom <= y, end, 0)
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end = findFirst(ch => measureCharPrepared(cm, preparedMeasure, ch).top > y, begin, end)
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return {begin, end}
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}
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export function wrappedLineExtentChar(cm, lineObj, preparedMeasure, target) {
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if (!preparedMeasure) preparedMeasure = prepareMeasureForLine(cm, lineObj)
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let targetTop = intoCoordSystem(cm, lineObj, measureCharPrepared(cm, preparedMeasure, target), "line").top
|
return wrappedLineExtent(cm, lineObj, preparedMeasure, targetTop)
|
}
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// Returns true if the given side of a box is after the given
|
// coordinates, in top-to-bottom, left-to-right order.
|
function boxIsAfter(box, x, y, left) {
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return box.bottom <= y ? false : box.top > y ? true : (left ? box.left : box.right) > x
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}
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function coordsCharInner(cm, lineObj, lineNo, x, y) {
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// Move y into line-local coordinate space
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y -= heightAtLine(lineObj)
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let preparedMeasure = prepareMeasureForLine(cm, lineObj)
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// When directly calling `measureCharPrepared`, we have to adjust
|
// for the widgets at this line.
|
let widgetHeight = widgetTopHeight(lineObj)
|
let begin = 0, end = lineObj.text.length, ltr = true
|
|
let order = getOrder(lineObj, cm.doc.direction)
|
// If the line isn't plain left-to-right text, first figure out
|
// which bidi section the coordinates fall into.
|
if (order) {
|
let part = (cm.options.lineWrapping ? coordsBidiPartWrapped : coordsBidiPart)
|
(cm, lineObj, lineNo, preparedMeasure, order, x, y)
|
ltr = part.level != 1
|
// The awkward -1 offsets are needed because findFirst (called
|
// on these below) will treat its first bound as inclusive,
|
// second as exclusive, but we want to actually address the
|
// characters in the part's range
|
begin = ltr ? part.from : part.to - 1
|
end = ltr ? part.to : part.from - 1
|
}
|
|
// A binary search to find the first character whose bounding box
|
// starts after the coordinates. If we run across any whose box wrap
|
// the coordinates, store that.
|
let chAround = null, boxAround = null
|
let ch = findFirst(ch => {
|
let box = measureCharPrepared(cm, preparedMeasure, ch)
|
box.top += widgetHeight; box.bottom += widgetHeight
|
if (!boxIsAfter(box, x, y, false)) return false
|
if (box.top <= y && box.left <= x) {
|
chAround = ch
|
boxAround = box
|
}
|
return true
|
}, begin, end)
|
|
let baseX, sticky, outside = false
|
// If a box around the coordinates was found, use that
|
if (boxAround) {
|
// Distinguish coordinates nearer to the left or right side of the box
|
let atLeft = x - boxAround.left < boxAround.right - x, atStart = atLeft == ltr
|
ch = chAround + (atStart ? 0 : 1)
|
sticky = atStart ? "after" : "before"
|
baseX = atLeft ? boxAround.left : boxAround.right
|
} else {
|
// (Adjust for extended bound, if necessary.)
|
if (!ltr && (ch == end || ch == begin)) ch++
|
// To determine which side to associate with, get the box to the
|
// left of the character and compare it's vertical position to the
|
// coordinates
|
sticky = ch == 0 ? "after" : ch == lineObj.text.length ? "before" :
|
(measureCharPrepared(cm, preparedMeasure, ch - (ltr ? 1 : 0)).bottom + widgetHeight <= y) == ltr ?
|
"after" : "before"
|
// Now get accurate coordinates for this place, in order to get a
|
// base X position
|
let coords = cursorCoords(cm, Pos(lineNo, ch, sticky), "line", lineObj, preparedMeasure)
|
baseX = coords.left
|
outside = y < coords.top || y >= coords.bottom
|
}
|
|
ch = skipExtendingChars(lineObj.text, ch, 1)
|
return PosWithInfo(lineNo, ch, sticky, outside, x - baseX)
|
}
|
|
function coordsBidiPart(cm, lineObj, lineNo, preparedMeasure, order, x, y) {
|
// Bidi parts are sorted left-to-right, and in a non-line-wrapping
|
// situation, we can take this ordering to correspond to the visual
|
// ordering. This finds the first part whose end is after the given
|
// coordinates.
|
let index = findFirst(i => {
|
let part = order[i], ltr = part.level != 1
|
return boxIsAfter(cursorCoords(cm, Pos(lineNo, ltr ? part.to : part.from, ltr ? "before" : "after"),
|
"line", lineObj, preparedMeasure), x, y, true)
|
}, 0, order.length - 1)
|
let part = order[index]
|
// If this isn't the first part, the part's start is also after
|
// the coordinates, and the coordinates aren't on the same line as
|
// that start, move one part back.
|
if (index > 0) {
|
let ltr = part.level != 1
|
let start = cursorCoords(cm, Pos(lineNo, ltr ? part.from : part.to, ltr ? "after" : "before"),
|
"line", lineObj, preparedMeasure)
|
if (boxIsAfter(start, x, y, true) && start.top > y)
|
part = order[index - 1]
|
}
|
return part
|
}
|
|
function coordsBidiPartWrapped(cm, lineObj, _lineNo, preparedMeasure, order, x, y) {
|
// In a wrapped line, rtl text on wrapping boundaries can do things
|
// that don't correspond to the ordering in our `order` array at
|
// all, so a binary search doesn't work, and we want to return a
|
// part that only spans one line so that the binary search in
|
// coordsCharInner is safe. As such, we first find the extent of the
|
// wrapped line, and then do a flat search in which we discard any
|
// spans that aren't on the line.
|
let {begin, end} = wrappedLineExtent(cm, lineObj, preparedMeasure, y)
|
if (/\s/.test(lineObj.text.charAt(end - 1))) end--
|
let part = null, closestDist = null
|
for (let i = 0; i < order.length; i++) {
|
let p = order[i]
|
if (p.from >= end || p.to <= begin) continue
|
let ltr = p.level != 1
|
let endX = measureCharPrepared(cm, preparedMeasure, ltr ? Math.min(end, p.to) - 1 : Math.max(begin, p.from)).right
|
// Weigh against spans ending before this, so that they are only
|
// picked if nothing ends after
|
let dist = endX < x ? x - endX + 1e9 : endX - x
|
if (!part || closestDist > dist) {
|
part = p
|
closestDist = dist
|
}
|
}
|
if (!part) part = order[order.length - 1]
|
// Clip the part to the wrapped line.
|
if (part.from < begin) part = {from: begin, to: part.to, level: part.level}
|
if (part.to > end) part = {from: part.from, to: end, level: part.level}
|
return part
|
}
|
|
let measureText
|
// Compute the default text height.
|
export function textHeight(display) {
|
if (display.cachedTextHeight != null) return display.cachedTextHeight
|
if (measureText == null) {
|
measureText = elt("pre")
|
// Measure a bunch of lines, for browsers that compute
|
// fractional heights.
|
for (let i = 0; i < 49; ++i) {
|
measureText.appendChild(document.createTextNode("x"))
|
measureText.appendChild(elt("br"))
|
}
|
measureText.appendChild(document.createTextNode("x"))
|
}
|
removeChildrenAndAdd(display.measure, measureText)
|
let height = measureText.offsetHeight / 50
|
if (height > 3) display.cachedTextHeight = height
|
removeChildren(display.measure)
|
return height || 1
|
}
|
|
// Compute the default character width.
|
export function charWidth(display) {
|
if (display.cachedCharWidth != null) return display.cachedCharWidth
|
let anchor = elt("span", "xxxxxxxxxx")
|
let pre = elt("pre", [anchor])
|
removeChildrenAndAdd(display.measure, pre)
|
let rect = anchor.getBoundingClientRect(), width = (rect.right - rect.left) / 10
|
if (width > 2) display.cachedCharWidth = width
|
return width || 10
|
}
|
|
// Do a bulk-read of the DOM positions and sizes needed to draw the
|
// view, so that we don't interleave reading and writing to the DOM.
|
export function getDimensions(cm) {
|
let d = cm.display, left = {}, width = {}
|
let gutterLeft = d.gutters.clientLeft
|
for (let n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {
|
left[cm.options.gutters[i]] = n.offsetLeft + n.clientLeft + gutterLeft
|
width[cm.options.gutters[i]] = n.clientWidth
|
}
|
return {fixedPos: compensateForHScroll(d),
|
gutterTotalWidth: d.gutters.offsetWidth,
|
gutterLeft: left,
|
gutterWidth: width,
|
wrapperWidth: d.wrapper.clientWidth}
|
}
|
|
// Computes display.scroller.scrollLeft + display.gutters.offsetWidth,
|
// but using getBoundingClientRect to get a sub-pixel-accurate
|
// result.
|
export function compensateForHScroll(display) {
|
return display.scroller.getBoundingClientRect().left - display.sizer.getBoundingClientRect().left
|
}
|
|
// Returns a function that estimates the height of a line, to use as
|
// first approximation until the line becomes visible (and is thus
|
// properly measurable).
|
export function estimateHeight(cm) {
|
let th = textHeight(cm.display), wrapping = cm.options.lineWrapping
|
let perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3)
|
return line => {
|
if (lineIsHidden(cm.doc, line)) return 0
|
|
let widgetsHeight = 0
|
if (line.widgets) for (let i = 0; i < line.widgets.length; i++) {
|
if (line.widgets[i].height) widgetsHeight += line.widgets[i].height
|
}
|
|
if (wrapping)
|
return widgetsHeight + (Math.ceil(line.text.length / perLine) || 1) * th
|
else
|
return widgetsHeight + th
|
}
|
}
|
|
export function estimateLineHeights(cm) {
|
let doc = cm.doc, est = estimateHeight(cm)
|
doc.iter(line => {
|
let estHeight = est(line)
|
if (estHeight != line.height) updateLineHeight(line, estHeight)
|
})
|
}
|
|
// Given a mouse event, find the corresponding position. If liberal
|
// is false, it checks whether a gutter or scrollbar was clicked,
|
// and returns null if it was. forRect is used by rectangular
|
// selections, and tries to estimate a character position even for
|
// coordinates beyond the right of the text.
|
export function posFromMouse(cm, e, liberal, forRect) {
|
let display = cm.display
|
if (!liberal && e_target(e).getAttribute("cm-not-content") == "true") return null
|
|
let x, y, space = display.lineSpace.getBoundingClientRect()
|
// Fails unpredictably on IE[67] when mouse is dragged around quickly.
|
try { x = e.clientX - space.left; y = e.clientY - space.top }
|
catch (e) { return null }
|
let coords = coordsChar(cm, x, y), line
|
if (forRect && coords.xRel == 1 && (line = getLine(cm.doc, coords.line).text).length == coords.ch) {
|
let colDiff = countColumn(line, line.length, cm.options.tabSize) - line.length
|
coords = Pos(coords.line, Math.max(0, Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) - colDiff))
|
}
|
return coords
|
}
|
|
// Find the view element corresponding to a given line. Return null
|
// when the line isn't visible.
|
export function findViewIndex(cm, n) {
|
if (n >= cm.display.viewTo) return null
|
n -= cm.display.viewFrom
|
if (n < 0) return null
|
let view = cm.display.view
|
for (let i = 0; i < view.length; i++) {
|
n -= view[i].size
|
if (n < 0) return i
|
}
|
}
|
