Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Regex / System / Text / RegularExpressions / RegexReplacement.cs / 1 / RegexReplacement.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- // The RegexReplacement class represents a substitution string for // use when using regexs to search/replace, etc. It's logically // a sequence intermixed (1) constant strings and (2) group numbers. namespace System.Text.RegularExpressions { using System.Collections; internal sealed class RegexReplacement { /* * Since RegexReplacement shares the same parser as Regex, * the constructor takes a RegexNode which is a concatenation * of constant strings and backreferences. */ internal RegexReplacement(String rep, RegexNode concat, Hashtable _caps) { StringBuilder sb; ArrayList strings; ArrayList rules; int slot; _rep = rep; if (concat.Type() != RegexNode.Concatenate) throw new ArgumentException(SR.GetString(SR.ReplacementError)); sb = new StringBuilder(); strings = new ArrayList(); rules = new ArrayList(); for (int i = 0; i < concat.ChildCount(); i++) { RegexNode child = concat.Child(i); switch (child.Type()) { case RegexNode.Multi: sb.Append(child._str); break; case RegexNode.One: sb.Append(child._ch); break; case RegexNode.Ref: if (sb.Length > 0) { rules.Add(strings.Count); strings.Add(sb.ToString()); sb.Length = 0; } slot = child._m; if (_caps != null && slot >= 0) slot = (int)_caps[slot]; rules.Add(-Specials - 1 - slot); break; default: throw new ArgumentException(SR.GetString(SR.ReplacementError)); } } if (sb.Length > 0) { rules.Add(strings.Count); strings.Add(sb.ToString()); } _strings = strings; _rules = rules; } internal String _rep; internal ArrayList _strings; // table of string constants internal ArrayList _rules; // negative -> group #, positive -> string # // constants for special insertion patterns internal const int Specials = 4; internal const int LeftPortion = -1; internal const int RightPortion = -2; internal const int LastGroup = -3; internal const int WholeString = -4; /* * Given a Match, emits into the StringBuilder the evaluated * substitution pattern. */ private void ReplacementImpl(StringBuilder sb, Match match) { for (int i = 0; i < _rules.Count; i++) { int r = (int) _rules[i]; if (r >= 0) sb.Append((string) _strings[r]); else if (r < -Specials) sb.Append(match.GroupToStringImpl(-Specials - 1 - r)); else { switch (-Specials - 1 - r) { case LeftPortion: sb.Append(match.GetLeftSubstring()); break; case RightPortion: sb.Append(match.GetRightSubstring()); break; case LastGroup: sb.Append(match.LastGroupToStringImpl()); break; case WholeString: sb.Append(match.GetOriginalString()); break; } } } } /* * The original pattern string */ internal String Pattern { get { return _rep; } } /* * Returns the replacement result for a single match */ internal String Replacement(Match match) { StringBuilder sb = new StringBuilder(); ReplacementImpl(sb, match); return sb.ToString(); } /* * Three very similar algorithms appear below: replace (pattern), * replace (evaluator), and split. */ /* * Replaces all ocurrances of the regex in the string with the * replacement pattern. * * Note that the special case of no matches is handled on its own: * with no matches, the input string is returned unchanged. * The right-to-left case is split out because StringBuilder * doesn't handle right-to-left string building directly very well. */ internal String Replace(Regex regex, String input, int count, int startat) { Match match; if (count < -1) throw new ArgumentOutOfRangeException("count", SR.GetString(SR.CountTooSmall)); if (startat < 0 || startat > input.Length) throw new ArgumentOutOfRangeException("startat", SR.GetString(SR.BeginIndexNotNegative)); if (count == 0) return input; match = regex.Match(input, startat); if (!match.Success) { return input; } else { StringBuilder sb; if (!regex.RightToLeft) { sb = new StringBuilder(); int prevat = 0; do { if (match.Index != prevat) sb.Append(input, prevat, match.Index - prevat); prevat = match.Index + match.Length; ReplacementImpl(sb, match); if (--count == 0) break; match = match.NextMatch(); } while (match.Success); if (prevat < input.Length) sb.Append(input, prevat, input.Length - prevat); } else { ArrayList al = new ArrayList(); int prevat = input.Length; do { if (match.Index + match.Length != prevat) al.Add(input.Substring(match.Index + match.Length, prevat - match.Index - match.Length)); prevat = match.Index; for (int i = _rules.Count - 1; i >= 0; i--) { int r = (int) _rules[i]; if (r >= 0) al.Add((string) _strings[r]); else al.Add(match.GroupToStringImpl(-Specials - 1 - r)); } if (--count == 0) break; match = match.NextMatch(); } while (match.Success); sb = new StringBuilder(); if (prevat > 0) sb.Append(input, 0, prevat); for (int i = al.Count - 1; i >= 0; i--) { sb.Append((String)al[i]); } } return sb.ToString(); } } /* * Replaces all ocurrances of the regex in the string with the * replacement evaluator. * * Note that the special case of no matches is handled on its own: * with no matches, the input string is returned unchanged. * The right-to-left case is split out because StringBuilder * doesn't handle right-to-left string building directly very well. */ internal static String Replace(MatchEvaluator evaluator, Regex regex, String input, int count, int startat) { Match match; if (evaluator == null) throw new ArgumentNullException("evaluator"); if (count < -1) throw new ArgumentOutOfRangeException("count", SR.GetString(SR.CountTooSmall)); if (startat < 0 || startat > input.Length) throw new ArgumentOutOfRangeException("startat", SR.GetString(SR.BeginIndexNotNegative)); if (count == 0) return input; match = regex.Match(input, startat); if (!match.Success) { return input; } else { StringBuilder sb; if (!regex.RightToLeft) { sb = new StringBuilder(); int prevat = 0; do { if (match.Index != prevat) sb.Append(input, prevat, match.Index - prevat); prevat = match.Index + match.Length; sb.Append(evaluator(match)); if (--count == 0) break; match = match.NextMatch(); } while (match.Success); if (prevat < input.Length) sb.Append(input, prevat, input.Length - prevat); } else { ArrayList al = new ArrayList(); int prevat = input.Length; do { if (match.Index + match.Length != prevat) al.Add(input.Substring(match.Index + match.Length, prevat - match.Index - match.Length)); prevat = match.Index; al.Add(evaluator(match)); if (--count == 0) break; match = match.NextMatch(); } while (match.Success); sb = new StringBuilder(); if (prevat > 0) sb.Append(input, 0, prevat); for (int i = al.Count - 1; i >= 0; i--) { sb.Append((String)al[i]); } } return sb.ToString(); } } /* * Does a split. In the right-to-left case we reorder the * array to be forwards. */ internal static String[] Split(Regex regex, String input, int count, int startat) { Match match; String[] result; if (count < 0) throw new ArgumentOutOfRangeException("count", SR.GetString(SR.CountTooSmall)); if (startat < 0 || startat > input.Length) throw new ArgumentOutOfRangeException("startat", SR.GetString(SR.BeginIndexNotNegative)); if (count == 1) { result = new String[1]; result[0] = input; return result; } count -= 1; match = regex.Match(input, startat); if (!match.Success) { result = new String[1]; result[0] = input; return result; } else { ArrayList al = new ArrayList(); if (!regex.RightToLeft) { int prevat = 0; for (;;) { al.Add(input.Substring(prevat, match.Index - prevat)); prevat = match.Index + match.Length; // add all matched capture groups to the list. for (int i=1; i
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- Effect.cs
- NavigationCommands.cs
- CodeDefaultValueExpression.cs
- ReaderContextStackData.cs
- CheckoutException.cs
- AuthenticationService.cs
- OutputScopeManager.cs
- ProgressiveCrcCalculatingStream.cs
- Drawing.cs
- WpfSharedXamlSchemaContext.cs
- CommittableTransaction.cs
- DataTableMapping.cs
- Crc32.cs
- ObjectDisposedException.cs
- ThreadAbortException.cs
- Vector3DConverter.cs
- SqlUnionizer.cs
- ImageBrush.cs
- SafeUserTokenHandle.cs
- TagPrefixInfo.cs
- AttachedPropertyBrowsableAttribute.cs
- ToolCreatedEventArgs.cs
- C14NUtil.cs
- EventManager.cs
- ControlPaint.cs
- LiteralTextContainerControlBuilder.cs
- CodeVariableDeclarationStatement.cs
- TabRenderer.cs
- SafeCryptoHandles.cs
- ItemCheckEvent.cs
- InternalException.cs
- ClickablePoint.cs
- RootProfilePropertySettingsCollection.cs
- ProtocolElement.cs
- RouteParametersHelper.cs
- SafeProcessHandle.cs
- Stacktrace.cs
- Transactions.cs
- PropertyKey.cs
- LayoutUtils.cs
- AuthenticationSection.cs
- HighlightVisual.cs
- ListItemConverter.cs
- ConstraintEnumerator.cs
- SystemDiagnosticsSection.cs
- ObjectDataSourceDesigner.cs
- ConfigurationStrings.cs
- OutputCacheProviderCollection.cs
- DataGridViewTextBoxCell.cs
- ModelPropertyCollectionImpl.cs
- ActivityDesignerResources.cs
- _ShellExpression.cs
- DBSqlParserColumn.cs
- SqlUdtInfo.cs
- ObjectFactoryCodeDomTreeGenerator.cs
- ColorTypeConverter.cs
- DecimalStorage.cs
- DesignerToolStripControlHost.cs
- TokenizerHelper.cs
- FontEditor.cs
- InvalidOleVariantTypeException.cs
- SerialErrors.cs
- CodeCatchClause.cs
- DurationConverter.cs
- DesignerDataSourceView.cs
- HtmlControlPersistable.cs
- HScrollBar.cs
- COM2EnumConverter.cs
- EventPropertyMap.cs
- EventItfInfo.cs
- SmtpNtlmAuthenticationModule.cs
- VisualBrush.cs
- StreamSecurityUpgradeAcceptorAsyncResult.cs
- DataControlFieldCell.cs
- FontStyles.cs
- TemplateField.cs
- XMLUtil.cs
- BamlCollectionHolder.cs
- __ComObject.cs
- RoleGroupCollection.cs
- EntityDesignerUtils.cs
- DataGridViewRow.cs
- VScrollProperties.cs
- PointCollection.cs
- EventProvider.cs
- DiscoveryRequestHandler.cs
- AssemblyName.cs
- RSAPKCS1SignatureFormatter.cs
- XmlNamedNodeMap.cs
- PersonalizableAttribute.cs
- RegexInterpreter.cs
- ImageField.cs
- RectangleConverter.cs
- TrackingDataItemValue.cs
- ButtonField.cs
- EncodingDataItem.cs
- ModuleBuilderData.cs
- TreeViewCancelEvent.cs
- SelectionEditingBehavior.cs
- OutArgument.cs