static TextDirection estimateDirectionOfText()

in lib/src/intl/bidi.dart [256:287]

• 26 lines of code
• 10 McCabe index (conditional complexity)

  static TextDirection estimateDirectionOfText(String text,
      {bool isHtml = false}) {
    text = isHtml ? stripHtmlIfNeeded(text) : text;
    var rtlCount = 0;
    var total = 0;
    var hasWeaklyLtr = false;
    // Split a string into 'words' for directionality estimation based on
    // relative word counts.
    for (var token in text.split(RegExp(r'\s+'))) {
      if (startsWithRtl(token)) {
        rtlCount++;
        total++;
      } else if (RegExp(r'^http://').hasMatch(token)) {
        // Checked if token looks like something that must always be LTR even in
        // RTL text, such as a URL.
        hasWeaklyLtr = true;
      } else if (hasAnyLtr(token)) {
        total++;
      } else if (RegExp(r'\d').hasMatch(token)) {
        // Checked if token contains any numerals.
        hasWeaklyLtr = true;
      }
    }

    if (total == 0) {
      return hasWeaklyLtr ? TextDirection.LTR : TextDirection.UNKNOWN;
    } else if (rtlCount > _RTL_DETECTION_THRESHOLD * total) {
      return TextDirection.RTL;
    } else {
      return TextDirection.LTR;
    }
  }