* first action! (#1)

node_modules/jju/lib/analyze.js

@@ -0,0 +1,87 @@
+
+var tokenize = require('./parse').tokenize
+
+module.exports.analyze = function analyzeJSON(input, options) {
+  if (options == null) options = {}
+
+  if (!Array.isArray(input)) {
+    input = tokenize(input, options)
+  }
+
+  var result = {
+    has_whitespace: false,
+    has_comments: false,
+    has_newlines: false,
+    has_trailing_comma: false,
+    indent: '',
+    newline: '\n',
+    quote: '"',
+    quote_keys: true,
+  }
+
+  var stats = {
+    indent: {},
+    newline: {},
+    quote: {},
+  }
+
+  for (var i=0; i<input.length; i++) {
+    if (input[i].type === 'newline') {
+      if (input[i+1] && input[i+1].type === 'whitespace') {
+        if (input[i+1].raw[0] === '\t') {
+          // if first is tab, then indent is tab
+          stats.indent['\t'] = (stats.indent['\t'] || 0) + 1
+        }
+        if (input[i+1].raw.match(/^\x20+$/)) {
+          // if all are spaces, then indent is space
+          // this can fail with mixed indent (4, 2 would display 3)
+          var ws_len = input[i+1].raw.length
+          var indent_len = input[i+1].stack.length + 1
+          if (ws_len % indent_len === 0) {
+            var t = Array(ws_len / indent_len + 1).join(' ')
+            stats.indent[t] = (stats.indent[t] || 0) + 1
+          }
+        }
+      }
+
+      stats.newline[input[i].raw] = (stats.newline[input[i].raw] || 0) + 1
+    }
+
+    if (input[i].type === 'newline') {
+      result.has_newlines = true
+    }
+    if (input[i].type === 'whitespace') {
+      result.has_whitespace = true
+    }
+    if (input[i].type === 'comment') {
+      result.has_comments = true
+    }
+    if (input[i].type === 'key') {
+      if (input[i].raw[0] !== '"' && input[i].raw[0] !== "'") result.quote_keys = false
+    }
+
+    if (input[i].type === 'key' || input[i].type === 'literal') {
+      if (input[i].raw[0] === '"' || input[i].raw[0] === "'") {
+        stats.quote[input[i].raw[0]] = (stats.quote[input[i].raw[0]] || 0) + 1
+      }
+    }
+
+    if (input[i].type === 'separator' && input[i].raw === ',') {
+      for (var j=i+1; j<input.length; j++) {
+        if (input[j].type === 'literal' || input[j].type === 'key') break
+        if (input[j].type === 'separator') result.has_trailing_comma = true
+      }
+    }
+  }
+
+  for (var k in stats) {
+    if (Object.keys(stats[k]).length) {
+      result[k] = Object.keys(stats[k]).reduce(function(a, b) {
+        return stats[k][a] > stats[k][b] ? a : b
+      })
+    }
+  }
+
+  return result
+}
+