public LookupNode(SourcePosition pos, VariableNode variableNode, Node keyNode)
: base(pos)
{
this.variableNode = variableNode;
this.keyNode = keyNode;
}
private Node Variable()
{
// VARIABLE_DEF VARIABLE ASSIGN
Token variable = Match(TokenType.VARIABLE);
VariableNode varNode = new VariableNode(variable.Position, variable.Text);
TokenType next = LookAhead(1);
if (next == TokenType.LBRACKET)
{
SourcePosition pos = Match(TokenType.LBRACKET).Position;
Node key = Expression();
Match(TokenType.RBRACKET);
return new LookupNode(pos, varNode, key);
}
else if (LookAhead(1) == TokenType.PERIOD)
{
Match(TokenType.PERIOD);
PropertyTreeNode propertyTree = new PropertyTreeNode(varNode.Position, varNode, Property());
if (LookAhead(1) == TokenType.END_STATEMENT)
{
Match(TokenType.END_STATEMENT);
}
return propertyTree;
}
else if (LookAhead(1) == TokenType.COLON)
{
PropertyNode property = new PropertyNode(variable.Position, variable.Text);
Match(TokenType.COLON);
Node value = Expression();
if (LookAhead(1) == TokenType.COMMA)
Match(TokenType.COMMA);
return new AssignNode(property.Position, property, value, true);
}
else
{
return varNode;
}
}
private Node Parameter()
{
// variable (ASSIGN^ expression)?
Token t = Match(TokenType.VARIABLE);
VariableNode variable = new VariableNode(t.Position, t.Text);
if (LookAhead(1) == TokenType.ASSIGN)
{
SourcePosition pos = Match(TokenType.ASSIGN).Position;
Node e = Expression();
return new AssignNode(pos, variable, e, true);
}
return variable;
}
private CatchNode Catch()
{
SourcePosition pos = Match(TokenType.CATCH).Position;
VariableNode errorVariable = null;
if (LookAhead(1) == TokenType.LPAREN)
{
Match(TokenType.LPAREN);
Token variable = Match(TokenType.VARIABLE);
errorVariable = new VariableNode(variable.Position, variable.Text);
Match(TokenType.RPAREN);
}
BlockNode catchBlock = Block();
return new CatchNode(pos, errorVariable, catchBlock);
}
public CatchNode(SourcePosition pos, VariableNode errorVariable, BlockNode catchBlock)
: base(pos)
{
this.errorVariable = errorVariable;
this.catchBlock = catchBlock;
}
public CatchNode(SourcePosition pos, VariableNode errorVariable, BlockNode catchBlock)
: base(pos)
{
this.errorVariable = errorVariable;
this.catchBlock = catchBlock;
}