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65 lines
1.5 KiB
JavaScript
65 lines
1.5 KiB
JavaScript
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/**
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* @param {string | TemplateStringsArray} strings
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* @param {...unknown[]} values
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* @returns {string}
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*/
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export function dedent(strings, ...values) {
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const raw = typeof strings === 'string' ? [strings] : strings.raw
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const escapeSpecialCharacters = Array.isArray(strings)
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// first, perform interpolation
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let result = ''
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for (let i = 0; i < raw.length; i++) {
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let next = raw[i]
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if (next === undefined) {
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continue
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}
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if (escapeSpecialCharacters) {
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// handle escaped newlines, backticks, and interpolation characters
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next = next
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.replace(/\\\n[ \t]*/g, '')
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.replace(/\\`/g, '`')
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.replace(/\\\$/g, '$')
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.replace(/\\\{/g, '{')
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}
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result += next
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if (i < values.length) {
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result += values[i]
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}
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}
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// now strip indentation
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const lines = result.split('\n')
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let mindent = null
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for (const l of lines) {
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const m = l.match(/^(\s+)\S+/)
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if (m && m[1]) {
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const indent = m[1].length
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if (!mindent) {
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// this is the first indented line
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mindent = indent
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} else {
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mindent = Math.min(mindent, indent)
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}
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}
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}
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if (mindent !== null) {
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const m = mindent
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result = lines.map((l) => (l[0] === ' ' || l[0] === '\t' ? l.slice(m) : l)).join('\n')
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}
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// dedent eats leading and trailing whitespace too
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result = result.trim()
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if (escapeSpecialCharacters) {
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// handle escaped newlines at the end to ensure they don't get stripped too
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result = result.replace(/\\n/g, '\n')
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}
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return result
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}
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