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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
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| export const selection = { | ||
| // get normalized selection | ||
| get() { | ||
| let s = window.getSelection() | ||
|
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| // return unknown selection | ||
| if (!s.anchorNode || !s.anchorNode.parentNode.closest('.w-editarea')) return | ||
|
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| // collect start/end offsets | ||
| let start = absOffset(s.anchorNode, s.anchorOffset), end = absOffset(s.focusNode, s.focusOffset) | ||
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| // swap selection direction | ||
| let startNode = s.anchorNode.parentNode.closest('.w-segment'), startNodeOffset = s.anchorOffset, | ||
| endNode = s.focusNode.parentNode.closest('.w-segment'), endNodeOffset = s.focusOffset; | ||
| if (start > end) { | ||
| [end, endNode, endNodeOffset, start, startNode, startNodeOffset] = | ||
| [start, startNode, startNodeOffset, end, endNode, endNodeOffset] | ||
| } | ||
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| return { | ||
| start, | ||
| startNode, | ||
| startNodeOffset, | ||
| end, | ||
| endNode, | ||
| endNodeOffset, | ||
| collapsed: s.isCollapsed, | ||
| range: s.getRangeAt(0) | ||
| } | ||
| }, | ||
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| /** | ||
| * Set normalized selection | ||
| * @param {number | Array} start – absolute offset (excluding modifier chars) or relative offset [node, offset] | ||
| * @param {number | Array} end – absolute offset (excluding modifier chars) or relative offset [node, offset] | ||
| * @returns {start, , end} | ||
| */ | ||
| set(start, end) { | ||
| let s = window.getSelection() | ||
|
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| if (Array.isArray(start)) start = absOffset(...start) | ||
| if (Array.isArray(end)) end = absOffset(...end) | ||
|
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| // start/end must be within limits | ||
| start = Math.max(0, start) | ||
| if (end == null) end = start | ||
|
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| // find start/end nodes | ||
| let editarea = document.querySelector('.w-editarea') | ||
| let [startNode, startNodeOffset] = relOffset(editarea, start) | ||
| let [endNode, endNodeOffset] = relOffset(editarea, end) | ||
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| let currentRange = s.getRangeAt(0) | ||
| if ( | ||
| !(currentRange.startContainer === startNode.firstChild && currentRange.startOffset === startNodeOffset) && | ||
| !(currentRange.endContainer === endNode.firstChild && currentRange.endOffset === endNodeOffset) | ||
| ) { | ||
| // NOTE: Safari doesn't support reusing range | ||
| s.removeAllRanges() | ||
| let range = new Range() | ||
| range.setStart(startNode.firstChild, startNodeOffset) | ||
| range.setEnd(endNode.firstChild, endNodeOffset) | ||
| s.addRange(range) | ||
| } | ||
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| return { | ||
| start, startNode, end, endNode, | ||
| startNodeOffset, endNodeOffset, | ||
| collapsed: s.isCollapsed, | ||
| range: s.getRangeAt(0) | ||
| } | ||
| } | ||
| } | ||
|
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| // calculate absolute offset from relative pair | ||
| function absOffset(node, relOffset) { | ||
| let prevNode = node.parentNode.closest('.w-segment') | ||
| let offset = cleanText(prevNode.textContent.slice(0, relOffset)).length | ||
| while (prevNode = prevNode.previousSibling) offset += cleanText(prevNode.textContent).length | ||
| return offset | ||
| } | ||
|
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||
| // calculate node and relative offset from absolute offset | ||
| function relOffset(editarea, offset) { | ||
| let node = editarea.firstChild, len | ||
| // discount previous nodes | ||
| while (offset > (len = cleanText(node.textContent).length)) { | ||
| offset -= len, node = node.nextSibling | ||
| } | ||
| // convert current node to relative offset | ||
| let skip = 0 | ||
| for (let content = node.textContent, i = 0; i < offset; i++) { | ||
| while (content[i + skip] >= '\u0300') skip++ | ||
| } | ||
| return [node, offset + skip] | ||
| } | ||
|
|
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| // return clean from modifiers text | ||
| export function cleanText(str) { | ||
| return str.replace(/\u0300|\u0301/g, '') | ||
| } |
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