public Statement GetStatement()
{
var typeInfo = semanticModel.GetTypeInfo(literalExpressionSyntax);
var constantStatement = new ConstantStatement(literalExpressionSyntax.Token.Value);
if (literalExpressionSyntax.Token.Value != null)
{
constantStatement.Type = typeInfo.GetClassType();
}
return(constantStatement);
}
/// <summary>
/// Parses a statement.
/// </summary>
public static bool AcceptStatement(string Text, int Start, out Statement Statement, out int LastChar)
{
// Constant assignment
string varname;
if (AcceptString(Text, Start, "const", out LastChar))
{
if (AcceptWhitespace(Text, LastChar, out LastChar) > 0)
{
if (AcceptWord(Text, LastChar, out varname, out LastChar) && ValidVariable(varname))
{
if (AcceptWhitespace(Text, LastChar, out LastChar) > 0)
{
if (AcceptString(Text, LastChar, "=", out LastChar))
{
if (AcceptWhitespace(Text, LastChar, out LastChar) > 0)
{
Expression value;
if (AcceptExpression(Text, LastChar, out value, out LastChar))
{
AcceptWhitespace(Text, LastChar, out LastChar);
if (AcceptString(Text, LastChar, ";", out LastChar))
{
Statement = new ConstantStatement(varname, value);
return true;
}
}
}
}
}
}
}
}
// Define
Expression type;
if (AcceptTightExpression(Text, Start, out type, out LastChar))
{
if (AcceptWhitespace(Text, LastChar, out LastChar) > 0)
{
if (AcceptWord(Text, LastChar, out varname, out LastChar) && ValidVariable(varname))
{
if (AcceptWhitespace(Text, LastChar, out LastChar) > 0)
{
if (AcceptString(Text, LastChar, "=", out LastChar))
{
if (AcceptWhitespace(Text, LastChar, out LastChar) > 0)
{
Expression value;
if (AcceptExpression(Text, LastChar, out value, out LastChar))
{
AcceptWhitespace(Text, LastChar, out LastChar);
if (AcceptString(Text, LastChar, ";", out LastChar))
{
Statement = new DefineStatement(type, varname, value);
return true;
}
}
}
}
}
}
}
}
// Assign
if (AcceptWord(Text, Start, out varname, out LastChar) && ValidVariable(varname))
{
if (AcceptWhitespace(Text, LastChar, out LastChar) > 0)
{
if (AcceptString(Text, LastChar, "=", out LastChar))
{
if (AcceptWhitespace(Text, LastChar, out LastChar) > 0)
{
Expression value;
if (AcceptExpression(Text, LastChar, out value, out LastChar))
{
AcceptWhitespace(Text, LastChar, out LastChar);
if (AcceptString(Text, LastChar, ";", out LastChar))
{
Statement = new AssignStatement(varname, value);
return true;
}
}
}
}
}
}
// Return
if (AcceptString(Text, Start, "return", out LastChar))
{
if (AcceptWhitespace(Text, LastChar, out LastChar) > 0)
{
Expression returnvalue;
if (AcceptExpression(Text, LastChar, out returnvalue, out LastChar))
{
AcceptWhitespace(Text, LastChar, out LastChar);
if (AcceptString(Text, LastChar, ";", out LastChar))
{
Statement = new ReturnStatement(returnvalue);
return true;
}
}
}
}
Statement = null;
return false;
}
public ConstantExpressionInterpreter(ConstantStatement statement)
{
this.statement = statement;
}
