106 lines
3.4 KiB
C#
106 lines
3.4 KiB
C#
// Copyright (c) .NET Foundation. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Linq;
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namespace Microsoft.AspNetCore.Razor.Language.Legacy
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{
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internal static class ParserHelpers
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{
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public static char[] NewLineCharacters = new[]
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{
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'\r', // Carriage return
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'\n', // Linefeed
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'\u0085', // Next Line
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'\u2028', // Line separator
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'\u2029' // Paragraph separator
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};
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public static bool IsNewLine(char value)
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{
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return NewLineCharacters.Contains(value);
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}
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public static bool IsNewLine(string value)
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{
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return (value.Length == 1 && (IsNewLine(value[0]))) ||
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(string.Equals(value, Environment.NewLine, StringComparison.Ordinal));
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}
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public static bool IsIdentifier(string value)
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{
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return IsIdentifier(value, requireIdentifierStart: true);
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}
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public static bool IsIdentifier(string value, bool requireIdentifierStart)
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{
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IEnumerable<char> identifierPart = value;
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if (requireIdentifierStart)
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{
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identifierPart = identifierPart.Skip(1);
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}
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return (!requireIdentifierStart || IsIdentifierStart(value[0])) && identifierPart.All(IsIdentifierPart);
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}
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public static bool IsIdentifierStart(char value)
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{
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return value == '_' || IsLetter(value);
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}
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public static bool IsIdentifierPart(char value)
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{
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return IsLetter(value)
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|| IsDecimalDigit(value)
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|| IsConnecting(value)
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|| IsCombining(value)
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|| IsFormatting(value);
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}
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public static bool IsFormatting(char value)
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{
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return CharUnicodeInfo.GetUnicodeCategory(value) == UnicodeCategory.Format;
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}
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public static bool IsCombining(char value)
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{
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var cat = CharUnicodeInfo.GetUnicodeCategory(value);
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return cat == UnicodeCategory.SpacingCombiningMark || cat == UnicodeCategory.NonSpacingMark;
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}
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public static bool IsConnecting(char value)
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{
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return CharUnicodeInfo.GetUnicodeCategory(value) == UnicodeCategory.ConnectorPunctuation;
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}
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public static bool IsWhitespace(char value)
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{
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return value == ' ' ||
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value == '\f' ||
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value == '\t' ||
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value == '\u000B' || // Vertical Tab
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CharUnicodeInfo.GetUnicodeCategory(value) == UnicodeCategory.SpaceSeparator;
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}
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public static bool IsLetter(char value)
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{
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var cat = CharUnicodeInfo.GetUnicodeCategory(value);
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return cat == UnicodeCategory.UppercaseLetter
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|| cat == UnicodeCategory.LowercaseLetter
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|| cat == UnicodeCategory.TitlecaseLetter
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|| cat == UnicodeCategory.ModifierLetter
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|| cat == UnicodeCategory.OtherLetter
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|| cat == UnicodeCategory.LetterNumber;
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}
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public static bool IsDecimalDigit(char value)
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{
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return CharUnicodeInfo.GetUnicodeCategory(value) == UnicodeCategory.DecimalDigitNumber;
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}
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}
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}
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