protected virtual bool IsDestructiveChangeForSeparator( ISensitiveFragmentSeparatorsInfo separatorInfo, IReadOnlyList <T> itemsInRange, int start, int oldLength, int newLength, ITextProvider oldText, ITextProvider newText) { if (separatorInfo == null) { return(false); } if (separatorInfo.LeftSeparator.Length == 0 && separatorInfo.RightSeparator.Length == 0) { return(false); } // Find out if one of the existing fragments contains position // and if change damages fragment start or end separators var leftSeparator = separatorInfo.LeftSeparator; var rightSeparator = separatorInfo.RightSeparator; // If no items are affected, change is unsafe only if new region contains separators. if (itemsInRange.Count == 0) { // Simple optimization for whitespace insertion if (oldLength == 0 && string.IsNullOrWhiteSpace(newText.GetText(new TextRange(start, newLength)))) { return(false); } // Take into account that user could have deleted space between existing // <! and -- or added - to the existing <!- so extend search range accordingly. var fragmentStart = Math.Max(0, start - leftSeparator.Length + 1); var fragmentEnd = Math.Min(newText.Length, start + newLength + leftSeparator.Length - 1); var fragmentStartPosition = newText.IndexOf(leftSeparator, TextRange.FromBounds(fragmentStart, fragmentEnd), true); if (fragmentStartPosition >= 0) { return(true); } fragmentStart = Math.Max(0, start - rightSeparator.Length + 1); fragmentEnd = Math.Min(newText.Length, start + newLength + rightSeparator.Length - 1); fragmentStartPosition = newText.IndexOf(rightSeparator, TextRange.FromBounds(fragmentStart, fragmentEnd), true); if (fragmentStartPosition >= 0) { return(true); } return(false); } // Is change completely inside an existing item? if (itemsInRange.Count == 1 && (itemsInRange[0].Contains(start) && itemsInRange[0].Contains(start + oldLength))) { // Check that change does not affect item left separator if (TextRange.Contains(itemsInRange[0].Start, leftSeparator.Length, start)) { return(true); } // Check that change does not affect item right separator. Note that we should not be using // TextRange.Intersect since in case oldLength is zero (like when user is typing right before %> or ?>) // TextRange.Intersect will determine that zero-length range intersects with the right separator // which is incorrect. Typing at position 10 does not change separator at position 10. Similarly, // deleting text right before %> or ?> does not make change destructive. var rightSeparatorStart = itemsInRange[0].End - rightSeparator.Length; if (start + oldLength > rightSeparatorStart) { if (TextRange.Intersect(rightSeparatorStart, rightSeparator.Length, start, oldLength)) { return(true); } } // Touching left separator is destructive too, like when changing <% to <%@ // Check that change does not affect item left separator (whitespace is fine) if (itemsInRange[0].Start + leftSeparator.Length == start) { if (oldLength == 0) { var text = newText.GetText(new TextRange(start, newLength)); if (string.IsNullOrWhiteSpace(text)) { return(false); } } return(true); } var fragmentStart = itemsInRange[0].Start + separatorInfo.LeftSeparator.Length; fragmentStart = Math.Max(fragmentStart, start - separatorInfo.RightSeparator.Length + 1); var changeLength = newLength - oldLength; var fragmentEnd = itemsInRange[0].End + changeLength; fragmentEnd = Math.Min(fragmentEnd, start + newLength + separatorInfo.RightSeparator.Length - 1); if (newText.IndexOf(separatorInfo.RightSeparator, TextRange.FromBounds(fragmentStart, fragmentEnd), true) >= 0) { return(true); } return(false); } return(true); }
/// <summary> /// Determines if range contains given position /// </summary> public virtual bool Contains(int position) { return(TextRange.Contains(this, position)); }
/// <summary> /// Determines if range contains given position /// </summary> public virtual bool Contains(int position) => TextRange.Contains(this, position);