Improve detection when multiple special text are laid

[AlexV525]

In some cases that special texts are incomplete or stacked, the incomplete one might prevent another special text been created.

Consider the following case:

• Text: #电子书 //<M 167328>@蒋菊</M>:转发 //<M 213288>@吴瀚</M>:转发
• PoundText
  • start key: #
  • end key: #
• MentionText
  • start key: <M>
  • end key: </M>

The first mention text will be started while the mention text is not ended, at this time the default builder didn't cut off the previous special text, which means there will be no new special text.

extended_text_library/lib/src/special_text_span_builder.dart

Lines 19 to 40 in 344b802

	if (specialText != null) {
	if (!specialText.isEnd(textStack)) {
	specialText.appendContent(char);
	} else {
	inlineList.add(specialText.finishText());
	specialText = null;
	textStack = '';
	}
	} else {
	specialText = createSpecialText(textStack,
	textStyle: textStyle, onTap: onTap, index: i);
	if (specialText != null) {
	if (textStack.length - specialText.startFlag.length >= 0) {
	textStack = textStack.substring(
	0, textStack.length - specialText.startFlag.length);
	if (textStack.isNotEmpty) {
	inlineList.add(TextSpan(text: textStack, style: textStyle));
	}
	}
	textStack = '';
	}
	}

To avoid such case and not breakable too much, there can be a little trick that split the create method to implement this.

// Split create method
void _createSpecialText(int index, {bool create = true}) {
  if (create) {
    specialText = createSpecialText(
      textStack,
      textStyle: textStyle,
      onTap: onTap,
      index: index,
    );
  }
  if (specialText != null) {
    if (textStack.length - specialText.startFlag.length >= 0) {
      textStack = textStack.substring(
        0,
        textStack.length - specialText.startFlag.length,
      );
      if (textStack.isNotEmpty) {
         inlineList.add(TextSpan(text: textStack, style: textStyle));
      }
    }
    textStack = '';
  }
}

for (int i = 0; i < data.length; i++) {
  final String char = data[i];
  textStack += char;
  if (specialText != null) {
    // Try to create a new special text first.
    final SpecialText _tempText = createSpecialText(
      textStack,
      textStyle: textStyle,
      onTap: onTap,
      index: i,
    );
    // Prepend the previous special text's start key, then drop the old special text.
    if (_tempText != null &&
        _tempText.runtimeType != specialText.runtimeType) {
      textStack = '${specialText.startFlag}$textStack';
      specialText = _tempText;
      _createSpecialText(i, create: false);
    } else {
      if (!specialText.isEnd(textStack)) {
        specialText.appendContent(char);
      } else {
        inlineList.add(specialText.finishText());
        specialText = null;
        textStack = '';
      }
    }
  } else {
    _createSpecialText(i);
  }
}

[zmtzawqlp]

extended_text_library/lib/src/special_text_span_builder.dart

Line 125 in 8cf81cd

final List<InlineSpan> children = <InlineSpan>[];

正则的应该可以实现