planning

node_modules/detab/index.js

@@ -0,0 +1,45 @@
+'use strict'
+
+module.exports = detab
+
+var repeat = require('repeat-string')
+
+var search = /[\t\n\r]/g
+
+// Replace tabs with spaces, being smart about which column the tab is at and
+// which size should be used.
+function detab(value, size) {
+  var tabSize = size || 4
+  var result = []
+  var start = 0
+  var index = 0
+  var column = -1
+  var add
+  var match
+  var end
+
+  if (typeof value !== 'string') {
+    throw new Error('detab expected string')
+  }
+
+  while (index < value.length) {
+    search.lastIndex = index
+    match = search.exec(value)
+    end = match ? match.index : value.length
+
+    if (value.charCodeAt(end) === 9) {
+      add = tabSize - ((column + end - index + 1) % tabSize)
+      result.push(value.slice(start, end), repeat(' ', add))
+      column += end - index + add
+      start = end + 1
+    } else {
+      column = -1
+    }
+
+    index = end + 1
+  }
+
+  result.push(value.slice(start))
+
+  return result.join('')
+}