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detect-indent
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files >> //proc/self/root/usr/lib/node_modules/npm/node_modules/detect-indent/index.js
'use strict'; // detect either spaces or tabs but not both to properly handle tabs // for indentation and spaces for alignment const INDENT_RE = /^(?:( )+|\t+)/; function getMostUsed(indents) { let result = 0; let maxUsed = 0; let maxWeight = 0; for (const entry of indents) { // TODO: use destructuring when targeting Node.js 6 const key = entry[0]; const val = entry[1]; const u = val[0]; const w = val[1]; if (u > maxUsed || (u === maxUsed && w > maxWeight)) { maxUsed = u; maxWeight = w; result = Number(key); } } return result; } module.exports = str => { if (typeof str !== 'string') { throw new TypeError('Expected a string'); } // used to see if tabs or spaces are the most used let tabs = 0; let spaces = 0; // remember the size of previous line's indentation let prev = 0; // remember how many indents/unindents as occurred for a given size // and how much lines follow a given indentation // // indents = { // 3: [1, 0], // 4: [1, 5], // 5: [1, 0], // 12: [1, 0], // } const indents = new Map(); // pointer to the array of last used indent let current; // whether the last action was an indent (opposed to an unindent) let isIndent; for (const line of str.split(/\n/g)) { if (!line) { // ignore empty lines continue; } let indent; const matches = line.match(INDENT_RE); if (matches) { indent = matches[0].length; if (matches[1]) { spaces++; } else { tabs++; } } else { indent = 0; } const diff = indent - prev; prev = indent; if (diff) { // an indent or unindent has been detected isIndent = diff > 0; current = indents.get(isIndent ? diff : -diff); if (current) { current[0]++; } else { current = [1, 0]; indents.set(diff, current); } } else if (current) { // if the last action was an indent, increment the weight current[1] += Number(isIndent); } } const amount = getMostUsed(indents); let type; let indent; if (!amount) { type = null; indent = ''; } else if (spaces >= tabs) { type = 'space'; indent = ' '.repeat(amount); } else { type = 'tab'; indent = '\t'.repeat(amount); } return { amount, type, indent }; };
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