factor out parse-features-string.js

lib/common/parse-features-string.js

@@ -0,0 +1,24 @@
+// parses a feature string that has the format used in window.open()
+// - `str` input string
+// - `emit` function(key, value) - called for each parsed KV
+module.exports = function parseFeaturesString (str, emit) {
+  // split the string by ','
+  let i, len
+  let strTokens = params.str.split(/,\s*/)
+  for (i = 0, len = strTokens.length; i < len; i++) {
+    // expected form is either a key by itself (true boolean flag)
+    // or a key/value, in the form of 'key=value'
+    // split the tokens by '='
+    let kv = strTokens[i]
+    let kvTokens = kv.split(/\s*=/)
+    let key = kvTokens[0]
+    let value = kvTokens[1]
+    if (!key) continue
+
+    // interpret the value as a boolean, if possible 
+    value = (value === 'yes' || value === '1') ? true : (value === 'no' || value === '0') ? false : value
+
+    // emit the parsed pair
+    emit(key, value)
+  }
+}