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Feature Supported: available in live-preview mode
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| import { ViewPlugin, ViewUpdate, EditorView, DecorationSet, Decoration, WidgetType } from '@codemirror/view' | ||
| import { RangeSetBuilder } from '@codemirror/rangeset' | ||
| import { syntaxTree } from '@codemirror/language' | ||
| import { lineClassNodeProp } from '@codemirror/stream-parser' | ||
| import { braceSurroundingRegex, paramRegex } from './util' | ||
|
|
||
| interface CodeblockInfo { | ||
| showLineNumbers: boolean; | ||
| highlightLines: number[] | null; | ||
| } | ||
|
|
||
| class LineNumberWidget extends WidgetType { | ||
| idx: number; | ||
|
|
||
| constructor(idx: number) { | ||
| super(); | ||
| this.idx = idx | ||
| } | ||
|
|
||
| toDOM() { | ||
| const el = document.createElement('span'); | ||
| el.className = 'live-preview-codeblock-line-nums'; | ||
| el.textContent = '' + this.idx; | ||
| return el; | ||
| } | ||
| } | ||
|
|
||
| export const livePreviewCM6Extension = ViewPlugin.fromClass(class { | ||
| decorations: DecorationSet | ||
|
|
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| constructor(view: EditorView) { | ||
| this.decorations = this.buildDecorations(view); | ||
| } | ||
|
|
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| update(update: ViewUpdate) { | ||
| if (update.docChanged || update.viewportChanged) this.decorations = this.buildDecorations(update.view); | ||
| } | ||
|
|
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| destory() {} | ||
|
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| buildDecorations(view: EditorView) { | ||
| const builder = new RangeSetBuilder<Decoration>(); | ||
| const codeblockInfo: CodeblockInfo = { | ||
| showLineNumbers: false, | ||
| highlightLines: null, | ||
| } | ||
| let idx = 1; | ||
|
|
||
| for (const {from, to} of view.visibleRanges) { | ||
| try { | ||
| const tree = syntaxTree(view.state) | ||
|
|
||
| tree.iterate({ | ||
| from, to, | ||
| enter: (type, from, to) => { | ||
| const lineClasses = type.prop(lineClassNodeProp) | ||
|
|
||
| if (!lineClasses) return ; | ||
| const classes = new Set(lineClasses.split(' ')); | ||
| const isCodeblockBegin = classes.has('HyperMD-codeblock-begin'); | ||
| const isCodeblockLine = | ||
| classes.has('HyperMD-codeblock-bg') | ||
| && !classes.has('HyperMD-codeblock-begin') | ||
| && !classes.has('HyperMD-codeblock-end'); | ||
|
|
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| // reset data when found codeblock begin line. | ||
| if (isCodeblockBegin) { | ||
| idx = 1; | ||
| const codeblockParams = view.state.doc.lineAt(from).text.match(paramRegex).slice(1); | ||
| const highlightParam = codeblockParams.find((param) => braceSurroundingRegex.test(param))?.slice(1, -1); | ||
| codeblockInfo.showLineNumbers = false; | ||
| codeblockInfo.highlightLines = null; | ||
|
|
||
| if (codeblockParams.includes('nums')) codeblockInfo.showLineNumbers = true; | ||
| if (highlightParam) codeblockInfo.highlightLines = highlightParam.replace(' ', '').split(',').flatMap((line) => { | ||
| if (!+line) { | ||
| const res = []; | ||
| const [start, end] = line.split('-'); | ||
| for (let i = +start; i <= +end; i++) { | ||
| res.push(i); | ||
| } | ||
|
|
||
| return res; | ||
| } | ||
|
|
||
| return [+line]; | ||
| }); | ||
| } | ||
| if (!isCodeblockLine) return ; | ||
|
|
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| if (codeblockInfo.showLineNumbers) { | ||
| const deco = Decoration.widget({ | ||
| widget: new LineNumberWidget(idx) | ||
| }); | ||
| builder.add(from, from, deco); | ||
| } | ||
|
|
||
| if (codeblockInfo.highlightLines) { | ||
| if (codeblockInfo.highlightLines.includes(idx)) { | ||
| const line = view.state.doc.lineAt(from); | ||
| const deco = Decoration.line({ | ||
| attributes: {class: 'live-preview-codeblock-highlight'} | ||
| }) | ||
|
|
||
| // @ts-ignore | ||
| deco.startSide = builder.last.startSide; | ||
| deco.endSide = deco.startSide | ||
|
|
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| builder.add(line.from, line.from, deco); | ||
| } | ||
| } | ||
|
|
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| idx++; | ||
| } | ||
| }) | ||
| } catch (error) { | ||
| console.log(error) | ||
| } | ||
| } | ||
|
|
||
| return builder.finish(); | ||
| } | ||
| }, | ||
| { | ||
| decorations: v => v.decorations | ||
| }) |
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