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Diffstat (limited to 'main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Editor.Util/SimpleBracketMatcher.cs')
| -rw-r--r-- | main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Editor.Util/SimpleBracketMatcher.cs | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Editor.Util/SimpleBracketMatcher.cs b/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Editor.Util/SimpleBracketMatcher.cs new file mode 100644 index 0000000000..b7cc92bb45 --- /dev/null +++ b/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Editor.Util/SimpleBracketMatcher.cs @@ -0,0 +1,273 @@ +// +// SimpleBracketMatcher.cs +// +// Author: +// Mike Krüger <mkrueger@xamarin.com> +// +// Copyright (c) 2014 Xamarin Inc. (http://xamarin.com) +// +// Permission is hereby granted, free of charge, to any person obtaining a copy +// of this software and associated documentation files (the "Software"), to deal +// in the Software without restriction, including without limitation the rights +// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the Software is +// furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +// THE SOFTWARE. +using System; +using System.Collections.Generic; +using MonoDevelop.Ide.Editor.Highlighting; + +namespace MonoDevelop.Ide.Editor.Util +{ + public static class SimpleBracketMatcher + { + const string openBrackets = "([{<"; + const string closingBrackets = ")]}>"; + + + public static int GetMatchingBracketOffset (IReadonlyTextDocument document, int offset) + { + if (offset < 0 || offset >= document.Length) + return -1; + char ch = document.GetCharAt (offset); + int bracket = openBrackets.IndexOf (ch); + int result; + if (bracket >= 0) { + result = SearchMatchingBracketForward (document, offset + 1, closingBrackets [bracket], openBrackets [bracket]); + } else { + bracket = closingBrackets.IndexOf (ch); + if (bracket >= 0) { + result = SearchMatchingBracketBackward (document, offset - 1, openBrackets [bracket], closingBrackets [bracket]); + } else { + result = -1; + } + } + return result; + } + + static readonly string [] emptyList = new string [0]; + static string [] GetList (IReadonlyTextDocument document, string name) + { + return TextEditorFactory.GetSyntaxProperties (document.MimeType, name) ?? emptyList; + } + + static int StartsWithListMember (IReadonlyTextDocument document, IList<string> list, int offset) + { + if (document == null) + throw new ArgumentNullException ("document"); + if (list == null) + throw new ArgumentNullException ("list"); + for (int i = 0; i < list.Count; i++) { + string item = list [i]; + if (offset + item.Length < document.Length) { + if (document.GetTextAt (offset, item.Length) == item) + return i; + } + } + return -1; + } + + static int SearchMatchingBracketForward (IReadonlyTextDocument document, int offset, char openBracket, char closingBracket) + { + bool isInBlockComment = false; + bool isInLineComment = false; + int curStringQuote = -1; + + bool startsInLineComment = StartsInLineComment (document, offset); + + var lineComments = GetList (document, "LineComment"); + var blockCommentStarts = GetList (document, "BlockCommentStart"); + var blockCommentEnds = GetList (document, "BlockCommentEnd"); + var stringQuotes = GetList (document, "StringQuote"); + int depth = -1; + while (offset >= 0 && offset < document.Length) { + if (curStringQuote < 0) { + // check line comments + if (!isInBlockComment && !isInLineComment) + isInLineComment = StartsWithListMember (document, lineComments, offset) >= 0; + + // check block comments + if (!isInLineComment) { + if (!isInBlockComment) { + isInBlockComment = StartsWithListMember (document, blockCommentStarts, offset) >= 0; + } else { + isInBlockComment = StartsWithListMember (document, blockCommentEnds, offset) < 0; + } + } + } + + if (!isInBlockComment && !isInLineComment) { + int i = StartsWithListMember (document, stringQuotes, offset); + if (i >= 0) { + if (curStringQuote >= 0) { + if (curStringQuote == i) + curStringQuote = -1; + } else { + curStringQuote = i; + } + } + } + + char ch = document.GetCharAt (offset); + switch (ch) { + case '\n': + case '\r': + if (startsInLineComment) + return -1; + isInLineComment = false; + break; + default: + if (ch == closingBracket) { + if (!(isInLineComment || curStringQuote >= 0 || isInBlockComment)) + --depth; + } else if (ch == openBracket) { + if (!(isInLineComment || curStringQuote >= 0 || isInBlockComment)) { + ++depth; + if (depth == 0) + return offset; + } + } + break; + } + offset++; + } + return -1; + } + + static bool StartsInLineComment (IReadonlyTextDocument document, int offset) + { + IList<string> lineComments = GetList (document, "LineComment"); + var line = document.GetLineByOffset (offset); + for (int i = line.Offset; i < offset; i++) { + if (StartsWithListMember (document, lineComments, i) >= 0) + return true; + } + return false; + } + + static int GetLastSourceCodePosition (IReadonlyTextDocument document, int lineOffset) + { + var line = document.GetLineByOffset (lineOffset); + bool isInBlockComment = false; + bool isInLineComment = false; + int curStringQuote = -1; + + IList<string> lineComments = GetList (document, "LineComment"); + IList<string> blockCommentStarts = GetList (document, "BlockCommentStart"); + IList<string> blockCommentEnds = GetList (document, "BlockCommentEnd"); + IList<string> stringQuotes = GetList (document, "StringQuote"); + + for (int i = 0; i < line.Length; i++) { + int offset = line.Offset + i; + // check line comments + if (!isInBlockComment && curStringQuote < 0) { + isInLineComment = StartsWithListMember (document, lineComments, offset) >= 0; + if (isInLineComment) + return System.Math.Min (offset, lineOffset); + } + // check block comments + if (!isInLineComment && curStringQuote < 0) { + if (!isInBlockComment) { + isInBlockComment = StartsWithListMember (document, blockCommentStarts, offset) >= 0; + } else { + isInBlockComment = StartsWithListMember (document, blockCommentEnds, offset) < 0; + } + } + + if (!isInBlockComment && !isInLineComment) { + int j = StartsWithListMember (document, stringQuotes, offset); + if (j >= 0) { + if (curStringQuote >= 0) { + if (curStringQuote == j) + curStringQuote = -1; + } else { + curStringQuote = j; + } + } + } + } + return lineOffset; + } + + static int SearchMatchingBracketBackward (IReadonlyTextDocument document, int offset, char openBracket, char closingBracket) + { + bool isInBlockComment = false; + bool isInLineComment = false; + int curStringQuote = -1; + + IList<string> blockCommentStarts = GetList (document, "BlockCommentStart"); + IList<string> blockCommentEnds = GetList (document, "BlockCommentEnd"); + IList<string> stringQuotes = GetList (document, "StringQuote"); + + bool startsInLineComment = StartsInLineComment (document, offset); + int depth = -1; + + if (!startsInLineComment) + offset = GetLastSourceCodePosition (document, offset); + + while (offset >= 0 && offset < document.Length) { + char ch = document.GetCharAt (offset); + + // check block comments + if (!isInLineComment && curStringQuote < 0) { + if (!isInBlockComment) { + isInBlockComment = StartsWithListMember (document, blockCommentEnds, offset) >= 0; + } else { + isInBlockComment = StartsWithListMember (document, blockCommentStarts, offset) < 0; + } + } + + if (!isInBlockComment && !isInLineComment) { + int i = StartsWithListMember (document, stringQuotes, offset); + if (i >= 0) { + if (curStringQuote >= 0) { + if (curStringQuote == i) + curStringQuote = -1; + } else { + curStringQuote = i; + } + } + } + + switch (ch) { + case '\n': + case '\r': + if (startsInLineComment) + return -1; + offset--; + while (offset > 0 && (document.GetCharAt (offset) == '\n' || document.GetCharAt (offset) == '\r')) { + offset--; + } + offset = GetLastSourceCodePosition (document, offset) + 1; + break; + default: + if (ch == closingBracket) { + if (!(curStringQuote >= 0 || isInBlockComment)) + --depth; + } else if (ch == openBracket) { + if (!(curStringQuote >= 0 || isInBlockComment)) { + ++depth; + if (depth == 0) + return offset; + } + } + break; + } + offset--; + } + return -1; + } + } + +} + |