/
ParseTreeValue.cs
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/
ParseTreeValue.cs
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using System;
using System.Collections.Generic;
using System.Globalization;
using Rubberduck.Parsing.Grammar;
using Rubberduck.Parsing.PreProcessing;
namespace Rubberduck.CodeAnalysis.Inspections.Concrete.UnreachableCaseEvaluation
{
internal interface IParseTreeValue
{
string Token { get; }
string ValueType { get; }
bool ParsesToConstantValue { get; }
bool IsOverflowExpression { get; }
bool IsMismatchExpression { get; }
}
internal struct ParseTreeValue : IParseTreeValue
{
private readonly int _hashCode;
private TypeTokenPair _typeTokenPair;
private ComparableDateValue _dateValue;
private StringLiteralExpression _stringConstant;
private bool? _exceedsValueTypeRange;
private static Dictionary<string,string> ControlCharacterCompareTokens = new Dictionary<string, string>()
{
["Chr$(8)"] = "Chr$(8)", //vbBack
["Chr$(13)"] = "Chr$(13)", //vbCr
["Chr$(13) + Chr$(10)"] = "Chr$(13)Chr$(10)", //vbCrLf
["Chr$(10)"] = "Chr$(10)", //vbLf
["Chr$(12)"] = "Chr$(12)", //vbFormFeed
["Chr$(13) & Chr$(10)"] = "Chr$(13)Chr$(10)", //vbNewLine
["Chr$(0)"] = "Chr$(0)", //vbNullChar
["Chr$(9)"] = "Chr$(9)", //vbTab
["Chr$(11)"] = "Chr$(11)", //vbVerticalTab
["Chr$(13)Chr$(10)"] = "Chr$(13)Chr$(10)",
};
public static bool TryGetNonPrintingControlCharCompareToken(string controlCharCandidate, out string comparableToken)
{
comparableToken = controlCharCandidate;
if (controlCharCandidate.StartsWith(Tokens.Chr))
{
var key = controlCharCandidate.Replace("Chr(", "Chr$(");
return ControlCharacterCompareTokens.TryGetValue(key, out comparableToken);
}
return false;
}
public static IParseTreeValue CreateValueType(TypeTokenPair value)
{
if (value.ValueType.Equals(Tokens.Date) || value.ValueType.Equals(Tokens.String))
{
return new ParseTreeValue(value);
}
var ptValue = new ParseTreeValue()
{
_typeTokenPair = value,
ParsesToConstantValue = true,
IsOverflowExpression = LetCoerce.ExceedsValueTypeRange(value.ValueType, value.Token),
};
return ptValue;
}
public static IParseTreeValue CreateExpression(TypeTokenPair typeToken)
{
var ptValue = new ParseTreeValue()
{
_typeTokenPair = typeToken,
ParsesToConstantValue = false,
};
return ptValue;
}
public static IParseTreeValue CreateMismatchExpression(string value, string declaredValueType)
{
var ptValue = new ParseTreeValue()
{
_typeTokenPair = new TypeTokenPair(declaredValueType, value),
ParsesToConstantValue = false,
IsMismatchExpression = true
};
return ptValue;
}
public static IParseTreeValue CreateOverflowExpression(string value, string declaredValueType)
{
var ptValue = new ParseTreeValue()
{
_typeTokenPair = new TypeTokenPair(declaredValueType, value),
ParsesToConstantValue = false,
_exceedsValueTypeRange = true
};
return ptValue;
}
public ParseTreeValue(TypeTokenPair valuePair)
{
_typeTokenPair = valuePair;
ParsesToConstantValue = false;
_exceedsValueTypeRange = null;
_hashCode = valuePair.Token.GetHashCode();
_dateValue = null;
_stringConstant = null;
IsMismatchExpression = false;
if (valuePair.ValueType.Equals(Tokens.Date))
{
ParsesToConstantValue = LetCoerce.TryCoerce(_typeTokenPair.Token, out _dateValue);
}
else if (valuePair.ValueType.Equals(Tokens.String) && IsStringConstant(valuePair.Token))
{
_stringConstant = new StringLiteralExpression(new ConstantExpression(new StringValue(_typeTokenPair.Token)));
ParsesToConstantValue = true;
}
else if (valuePair.ValueType.Equals(Tokens.String)
&& TryGetNonPrintingControlCharCompareToken(valuePair.Token, out _))
{
ParsesToConstantValue = true;
}
}
public string ValueType => _typeTokenPair.ValueType;
public string Token
{
get
{
if (_dateValue != null)
{
return _dateValue.AsDateLiteral();
}
if (_stringConstant != null)
{
return $"\"{_stringConstant.Evaluate().AsString}\"";
}
return _typeTokenPair.Token;
}
}
public bool ParsesToConstantValue { private set; get; }
public bool IsMismatchExpression { private set; get; }
public bool IsOverflowExpression
{
private set
{
_exceedsValueTypeRange = value;
}
get
{
if (!_exceedsValueTypeRange.HasValue)
{
_exceedsValueTypeRange = ParsesToConstantValue ? LetCoerce.ExceedsValueTypeRange(ValueType, _typeTokenPair.Token) : false;
}
return _exceedsValueTypeRange.Value;
}
}
public override string ToString() => Token;
public override bool Equals(object obj)
{
if (obj is ParseTreeValue ptValue)
{
return ptValue.Token == Token && ptValue.ValueType == ValueType;
}
return false;
}
public override int GetHashCode()
{
return _hashCode;
}
private static bool IsStringConstant(string candidate) => candidate.StartsWith("\"") && candidate.EndsWith("\"");
}
internal static class ParseTreeValueExtensions
{
public static bool TryLetCoerce(this IParseTreeValue parseTreeValue, string destinationType, out IParseTreeValue newValue)
{
newValue = null;
if (LetCoerce.TryCoerceToken((parseTreeValue.ValueType, parseTreeValue.Token), destinationType, out var valueText))
{
newValue = ParseTreeValue.CreateValueType(new TypeTokenPair(destinationType, valueText));
return true;
}
return false;
}
public static double AsDouble(this IParseTreeValue parseTreeValue)
=> double.Parse(LetCoerce.Coerce((parseTreeValue.ValueType, parseTreeValue.Token), Tokens.Double), CultureInfo.InvariantCulture);
public static decimal AsCurrency(this IParseTreeValue parseTreeValue)
=> decimal.Parse(LetCoerce.Coerce((parseTreeValue.ValueType, parseTreeValue.Token), Tokens.Currency), CultureInfo.InvariantCulture);
public static long AsLong(this IParseTreeValue parseTreeValue)
=> long.Parse(LetCoerce.Coerce((parseTreeValue.ValueType, parseTreeValue.Token), Tokens.Long), CultureInfo.InvariantCulture);
public static bool AsBoolean(this IParseTreeValue parseTreeValue)
=> LetCoerce.Coerce((parseTreeValue.ValueType, parseTreeValue.Token), Tokens.Boolean).Equals(Tokens.True);
public static bool TryLetCoerce(this IParseTreeValue parseTreeValue, out long newValue)
=> TryLetCoerce(parseTreeValue, s => long.Parse(s, CultureInfo.InvariantCulture), Tokens.Long, out newValue);
public static bool TryLetCoerce(this IParseTreeValue parseTreeValue, out double newValue)
=> TryLetCoerce(parseTreeValue, s => double.Parse(s, CultureInfo.InvariantCulture), Tokens.Double, out newValue);
public static bool TryLetCoerce(this IParseTreeValue parseTreeValue, out decimal newValue)
=> TryLetCoerce(parseTreeValue, s => decimal.Parse(s, CultureInfo.InvariantCulture), Tokens.Currency, out newValue);
public static bool TryLetCoerce(this IParseTreeValue parseTreeValue, out bool value)
=> TryLetCoerce(parseTreeValue, bool.Parse, Tokens.Boolean, out value);
public static bool TryLetCoerce(this IParseTreeValue parseTreeValue, out string value)
=> TryLetCoerce(parseTreeValue, a => a, Tokens.String, out value);
private static bool TryLetCoerce(this IParseTreeValue parseTreeValue, out ComparableDateValue value)
=> TryLetCoerceToDate(parseTreeValue, out value);
private static bool TryLetCoerce<T>(this IParseTreeValue parseTreeValue, Func<string, T> parser, string typeName, out T newValue)
{
newValue = default;
if (LetCoerce.TryCoerceToken((parseTreeValue.ValueType, parseTreeValue.Token), typeName, out string valueText))
{
newValue = parser(valueText);
return true;
}
return false;
}
private static bool TryLetCoerceToDate(IParseTreeValue parseTreeValue, out ComparableDateValue value)
{
value = default;
if (LetCoerce.TryCoerceToken((parseTreeValue.ValueType, parseTreeValue.Token), Tokens.Date, out string valueText))
{
var literal = new DateLiteralExpression(new ConstantExpression(new StringValue(valueText)));
value = new ComparableDateValue((DateValue)literal.Evaluate());
return true;
}
return false;
}
}
}