using System.Collections.Generic; using System.Text.RegularExpressions; namespace Unity.UIWidgets.foundation { public static class DebugPrint { static readonly Regex _indentPattern = new Regex("^ *(?:[-+*] |[0-9]+[.):] )?"); public static IEnumerable debugWordWrap(string message, int width, string wrapIndent = "") { if (message.Length < width || message.TrimStart()[0] == '#') { yield return message; yield break; } Match prefixMatch = _indentPattern.Match(message); string prefix = wrapIndent + new string(' ', prefixMatch.Groups[0].Value.Length); int start = 0; int startForLengthCalculations = 0; bool addPrefix = false; int index = prefix.Length; _WordWrapParseMode mode = _WordWrapParseMode.inSpace; int lastWordStart = 0; int? lastWordEnd = null; while (true) { switch (mode) { case _WordWrapParseMode.inSpace: // at start of break point (or start of line); can"t break until next break while ((index < message.Length) && (message[index] == ' ')) { index += 1; } lastWordStart = index; mode = _WordWrapParseMode.inWord; break; case _WordWrapParseMode.inWord: // looking for a good break point while ((index < message.Length) && (message[index] != ' ')) { index += 1; } mode = _WordWrapParseMode.atBreak; break; case _WordWrapParseMode.atBreak: // at start of break point if ((index - startForLengthCalculations > width) || (index == message.Length)) { // we are over the width line, so break if ((index - startForLengthCalculations <= width) || (lastWordEnd == null)) { // we should use this point, because either it doesn"t actually go over the // end (last line), or it does, but there was no earlier break point lastWordEnd = index; } if (addPrefix) { yield return prefix + message.Substring(start, lastWordEnd.Value - start); } else { yield return message.Substring(start, lastWordEnd.Value - start); addPrefix = true; } if (lastWordEnd >= message.Length) { yield break; } // just yield returned a line if (lastWordEnd == index) { // we broke at current position // eat all the spaces, then set our start point while ((index < message.Length) && (message[index] == ' ')) { index += 1; } start = index; mode = _WordWrapParseMode.inWord; } else { // we broke at the previous break point, and we"re at the start of a new one D.assert(lastWordStart > lastWordEnd); start = lastWordStart; mode = _WordWrapParseMode.atBreak; } startForLengthCalculations = start - prefix.Length; D.assert(addPrefix); lastWordEnd = null; } else { // save this break point, we"re not yet over the line width lastWordEnd = index; // skip to the end of this break point mode = _WordWrapParseMode.inSpace; } break; } } } } }