mirror of https://github.com/sveltejs/svelte
54 lines
1.3 KiB
54 lines
1.3 KiB
const start = /\n(\t+)/;
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export default function deindent(
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strings: TemplateStringsArray,
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...values: any[]
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) {
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const indentation = start.exec(strings[0])[1];
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const pattern = new RegExp(`^${indentation}`, 'gm');
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let result = strings[0].replace(start, '').replace(pattern, '');
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let current_indentation = get_current_indentation(result);
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for (let i = 1; i < strings.length; i += 1) {
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let expression = values[i - 1];
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const string = strings[i].replace(pattern, '');
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if (Array.isArray(expression)) {
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expression = expression.length ? expression.join('\n') : null;
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}
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// discard empty codebuilders
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if (expression && expression.is_empty && expression.is_empty()) {
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expression = null;
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}
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if (expression || expression === '') {
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const value = String(expression).replace(
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/\n/g,
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`\n${current_indentation}`
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);
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result += value + string;
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} else {
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let c = result.length;
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while (/\s/.test(result[c - 1])) c -= 1;
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result = result.slice(0, c) + string;
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}
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current_indentation = get_current_indentation(result);
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}
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return result.trim().replace(/\t+$/gm, '').replace(/{\n\n/gm, '{\n');
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}
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function get_current_indentation(str: string) {
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let a = str.length;
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while (a > 0 && str[a - 1] !== '\n') a -= 1;
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let b = a;
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while (b < str.length && /\s/.test(str[b])) b += 1;
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return str.slice(a, b);
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}
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