/// <summary>Declares that the specified literal represents a boolean value.</summary>
/// <param name="literal">The literal to declare as boolean.</param>
/// <param name="value">The boolean value of the specified literal.</param>
/// <param name="position">The start position of the boolean declaration in the source code.</param>
public void DeclareBoolean(PredefinedLiteral literal, bool value, TextPosition position)
{
if (!TopLevel)
{
throw new ParserException("Boolean declarations are only allowed as top-level statements.", position);
}
switch (literal)
{
case PredefinedLiteral.Positive: polarityIsBoolean = true; positiveIsTrue = value; break;
case PredefinedLiteral.Negative: polarityIsBoolean = true; positiveIsTrue = !value; break;
case PredefinedLiteral.North: magneticIsBoolean = true; northIsTrue = value; break;
case PredefinedLiteral.South: magneticIsBoolean = true; northIsTrue = !value; break;
case PredefinedLiteral.Clockwise: curlIsBoolean = true; clockwiseIsTrue = value; break;
case PredefinedLiteral.Counterclockwise: clockwiseIsTrue = true; clockwiseIsTrue = !value; break;
case PredefinedLiteral.Open: circuitIsBoolean = true; openIsTrue = value; break;
case PredefinedLiteral.Closed: circuitIsBoolean = true; openIsTrue = !value; break;
}
}
static DataType GetType(PredefinedLiteral literal)
{
switch (literal)
{
case PredefinedLiteral.True:
case PredefinedLiteral.False: return(DataType.Logic);
case PredefinedLiteral.Positive:
case PredefinedLiteral.Negative: return(DataType.Polarity);
case PredefinedLiteral.North:
case PredefinedLiteral.South: return(DataType.Magnetic);
case PredefinedLiteral.Clockwise:
case PredefinedLiteral.Counterclockwise: return(DataType.Curl);
case PredefinedLiteral.Open:
case PredefinedLiteral.Closed: return(DataType.Circuit);
default: return(DataType.None);
}
}
static void Add(string word, PredefinedLiteral literal)
{
Add(word, TokenType.Literal);
literals[word] = literal;
}
/// <summary>Checks whether this token is the specified predefined literal token.</summary>
/// <param name="literal">The predefined literal to check.</param>
/// <returns>If this token equals the specified literal, true; otherwise, false.</returns>
public virtual bool Equals(PredefinedLiteral literal)
{
return(false);
}
/// <summary>Checks whether this token is the specified predefined literal token.</summary>
/// <param name="literal">The predefined literal to check.</param>
/// <returns>If this token equals the specified literal, true; otherwise, false.</returns>
public override bool Equals(PredefinedLiteral literal)
{
return(value == literal);
}
/// <summary>Initializes a new instance of the <see cref="PredefinedLiteralToken"/> class.</summary>
/// <param name="value">The value of the literal.</param>
/// <param name="startPosition">The start position.</param>
/// <param name="endPosition">The end position.</param>
internal PredefinedLiteralToken(PredefinedLiteral value, TextPosition startPosition, TextPosition endPosition)
: base(GetType(value), startPosition, endPosition)
{
this.value = value;
}
