88 lines
2.4 KiB
JavaScript
88 lines
2.4 KiB
JavaScript
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var tokenize = require('./parse').tokenize
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module.exports.analyze = function analyzeJSON(input, options) {
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if (options == null) options = {}
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if (!Array.isArray(input)) {
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input = tokenize(input, options)
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}
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var result = {
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has_whitespace: false,
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has_comments: false,
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has_newlines: false,
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has_trailing_comma: false,
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indent: '',
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newline: '\n',
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quote: '"',
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quote_keys: true,
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}
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var stats = {
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indent: {},
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newline: {},
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quote: {},
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}
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for (var i=0; i<input.length; i++) {
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if (input[i].type === 'newline') {
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if (input[i+1] && input[i+1].type === 'whitespace') {
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if (input[i+1].raw[0] === '\t') {
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// if first is tab, then indent is tab
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stats.indent['\t'] = (stats.indent['\t'] || 0) + 1
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}
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if (input[i+1].raw.match(/^\x20+$/)) {
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// if all are spaces, then indent is space
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// this can fail with mixed indent (4, 2 would display 3)
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var ws_len = input[i+1].raw.length
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var indent_len = input[i+1].stack.length + 1
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if (ws_len % indent_len === 0) {
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var t = Array(ws_len / indent_len + 1).join(' ')
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stats.indent[t] = (stats.indent[t] || 0) + 1
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}
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}
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}
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stats.newline[input[i].raw] = (stats.newline[input[i].raw] || 0) + 1
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}
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if (input[i].type === 'newline') {
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result.has_newlines = true
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}
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if (input[i].type === 'whitespace') {
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result.has_whitespace = true
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}
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if (input[i].type === 'comment') {
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result.has_comments = true
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}
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if (input[i].type === 'key') {
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if (input[i].raw[0] !== '"' && input[i].raw[0] !== "'") result.quote_keys = false
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}
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if (input[i].type === 'key' || input[i].type === 'literal') {
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if (input[i].raw[0] === '"' || input[i].raw[0] === "'") {
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stats.quote[input[i].raw[0]] = (stats.quote[input[i].raw[0]] || 0) + 1
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}
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}
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if (input[i].type === 'separator' && input[i].raw === ',') {
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for (var j=i+1; j<input.length; j++) {
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if (input[j].type === 'literal' || input[j].type === 'key') break
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if (input[j].type === 'separator') result.has_trailing_comma = true
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}
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}
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}
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for (var k in stats) {
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if (Object.keys(stats[k]).length) {
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result[k] = Object.keys(stats[k]).reduce(function(a, b) {
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return stats[k][a] > stats[k][b] ? a : b
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})
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}
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}
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return result
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}
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