ForEachStatement ParseForEachStatement()
{
// foreach-statement:
// foreach ({variable} in {end-value}) { {statements} }
// foreach (var {variable} in {end-value}) { {statements} }
// foreach (int {variable} in {end-value}) { {statements} }
ReadNextToken(); // skip 'foreach'
CheckForUnexpectedEndOfSource();
ReadNextToken(); // skip '('
CheckForUnexpectedEndOfSource();
Token lToken = fCurrentToken;
ReadNextToken();
Variable lVariable;
if (fCurrentToken.Value == "in")
lVariable = new Variable(lToken.Value, "var");
else
{
lVariable = new Variable(fCurrentToken.Value, lToken.Value);
ReadNextToken();
}
SkipExpected(TokenType.Word, "in"); // skip 'in'
Expression lCollection = ParseExpression();
CheckForUnexpectedEndOfSource();
SkipExpected(TokenType.Symbol, ")"); // skip ')'
List<Statement> lStatements = new List<Statement>();
bool hasBrace = false;
Statement lStatement;
if (fCurrentToken.Equals(TokenType.Symbol, "{"))
{
hasBrace = true;
SkipExpected(TokenType.Symbol, "{"); // skip '{'
CheckForUnexpectedEndOfSource();
while (!fCurrentToken.Equals(TokenType.Symbol, "}"))
{
if ((lStatement = ReadNextStatement()) != null)
lStatements.Add(lStatement);
else throw new ParserException("Unexpected end of source.");
}
ReadNextToken(); // skip '}'
}
else
{
if ((lStatement = ReadNextStatement()) != null)
lStatements.Add(lStatement);
else throw new ParserException("Unexpected end of source.");
}
return new ForEachStatement(lVariable, lCollection, new StatementCollection(lStatements, hasBrace));
}
VariableDefinition ParseVarStatement(string varType)
{
// var-statement:
// var {assignment} | {variable}
// DateTime {assignment} | {variable}
if(string.IsNullOrEmpty(varType))
ReadNextToken(); // skip 'var'
Variable v = new Variable(fCurrentToken.Value, varType);
ReadNextToken(); // skip variable name
if (fCurrentToken.Equals(TokenType.Symbol, "="))
{
ReadNextToken(); // skip '='
Expression value = ParseExpression();
return new VariableDefinition(v, value);
}
else
return new VariableDefinition(v, null);
}
Assignment ParseAssignment(Variable variable, string op)
{
// assignment:
// {variable} += {value}
ReadNextToken(); // skip '+='
Assignment a = null;
if (op == "++" || op == "--")
a = new Assignment(variable, op, null);
else
a = new Assignment(variable, op, ParseExpression());
return a;
}
public VariableIncrement(Variable var, int amount)
{
fVar = var;
fAmount = amount;
}