public static IfStatementNode Parse(AstTreeNode lastNode, ScriptToken scriptToken, List <ScriptToken> tokens)
{
if (tokens[1].Type != EScriptTokenType.L_PAREN)
{
Console.WriteLine("If statement needs to be followed by a condition encased in parenthesis.");
return(null);
}
List <ConditionalNode> nodes = new List <ConditionalNode>();
nodes.Add(ParseConditional(tokens));
while (tokens.Count > 0 && EScriptTokenType.ELSE_IF == tokens[0].Type)
{
nodes.Add(ParseConditional(tokens));
}
if (tokens.Count > 0 && EScriptTokenType.ELSE == tokens[0].Type)
{
tokens.RemoveAt(0); // Consume else
nodes.Add(new ConditionalNode(
new LiteralNode <bool>(true),
ScriptTree.ProcessTokens(ScriptTree.GetBlockTokens(tokens, EBlockType.BRACE, false)[0])
));
}
return(new IfStatementNode(nodes));
}
public static ForStatementNode Parse(AstTreeNode lastNode, ScriptToken scriptToken, List <ScriptToken> tokens)
{
if (tokens[1].Type != EScriptTokenType.L_PAREN)
{
Console.WriteLine("Syntax error: Missing ('");
return(null);
}
if (tokens[3].Type != EScriptTokenType.OF)
{
Console.WriteLine("Syntax error: Missing of");
return(null);
}
tokens.RemoveAt(0); // consume for
List <ScriptToken> loopDef = ScriptTree.GetEnclosedTokens(tokens);
ScriptToken variableName = loopDef[0];
loopDef.RemoveAt(0); // consume variable name
loopDef.RemoveAt(0); // consume of
AstTreeNode list = ScriptTree.ProcessTokens(loopDef);
AstTreeNode block = ScriptTree.ProcessTokens(ScriptTree.GetBlockTokens(tokens, EBlockType.BRACE, false)[0]);
return(new ForStatementNode(
new LiteralNode <string>(variableName.Value),
list,
block
));
}
public static ConditionalNode ParseConditional(List <ScriptToken> tokens)
{
List <EScriptTokenType> ifTokens = new List <EScriptTokenType>();
ifTokens.Add(EScriptTokenType.IF);
ifTokens.Add(EScriptTokenType.ELSE_IF);
if (!ifTokens.Contains(tokens[0].Type))
{
Console.WriteLine("Invalid Syntax");
return(null);
}
tokens.RemoveAt(0); // consume if and else if
return(new ConditionalNode(
ScriptTree.ProcessTokens(ScriptTree.GetBlockTokens(tokens, EBlockType.PAREN, false)[0]),
ScriptTree.ProcessTokens(ScriptTree.GetBlockTokens(tokens, EBlockType.BRACE, false)[0])
));
}