36 lines
1.3 KiB
TypeScript
36 lines
1.3 KiB
TypeScript
export type LineData = {
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line: string;
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indent: string;
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level: number;
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offsetHead: number;
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offsetTail: number;
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}
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export function createLineData(line: string = '', indent: string = ' '): LineData {
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return { line, indent, level: 0, offsetHead: 0, offsetTail: 0 }
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}
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export function parseLine(lineData: LineData): LineData {
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if ((typeof lineData !== 'object' || !lineData) || typeof lineData.level !== 'number') throw new Error(`'lineData' must be an object with string line and numeric level properties`)
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if (typeof lineData.indent !== 'string' || lineData.indent.length === 0 || lineData.indent.length > 1) throw new Error(`'lineData.indent' must be a single-character string`)
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if (typeof lineData.line !== 'string') throw new Error(`'lineData.line' must be a string`)
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let level = 0
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// Repeat previous level for blank lines.
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if (!lineData.line.length) {
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lineData.level = lineData.level
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lineData.offsetHead = 0
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lineData.offsetTail = 0
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} else {
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while (lineData.line[level] === lineData.indent && level <= lineData.level + 1) ++level
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lineData.level = level
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lineData.offsetHead = level
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lineData.offsetTail = level
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while (lineData.line[lineData.offsetTail] && lineData.line[lineData.offsetTail] !== ' ') ++lineData.offsetTail
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}
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return lineData
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}
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