private ConstructorDefinition ParseConstructor(
TokenStream tokens,
TopLevelConstruct owner,
AnnotationCollection annotations)
{
Token constructorToken = tokens.PopExpected(this.parser.Keywords.CONSTRUCTOR);
tokens.PopExpected("(");
List <Token> argNames = new List <Token>();
List <Expression> argValues = new List <Expression>();
bool optionalArgFound = false;
while (!tokens.PopIfPresent(")"))
{
if (argNames.Count > 0)
{
tokens.PopExpected(",");
}
Token argName = tokens.Pop();
this.parser.VerifyIdentifier(argName);
Expression defaultValue = null;
if (tokens.PopIfPresent("="))
{
defaultValue = this.parser.ExpressionParser.Parse(tokens, owner);
optionalArgFound = true;
}
else if (optionalArgFound)
{
throw this.parser.GenerateParseError(
ErrorMessages.OPTIONAL_ARGUMENT_WAS_NOT_AT_END_OF_ARGUMENT_LIST,
argName);
}
argNames.Add(argName);
argValues.Add(defaultValue);
}
List <Expression> baseArgs = new List <Expression>();
Token baseToken = null;
if (tokens.PopIfPresent(":"))
{
baseToken = tokens.PopExpected(this.parser.Keywords.BASE);
tokens.PopExpected("(");
while (!tokens.PopIfPresent(")"))
{
if (baseArgs.Count > 0)
{
tokens.PopExpected(",");
}
baseArgs.Add(this.parser.ExpressionParser.Parse(tokens, owner));
}
}
IList <Executable> code = ParserContext.ParseBlock(parser, tokens, true, owner);
return(new ConstructorDefinition(constructorToken, argNames, argValues, baseArgs, code, baseToken, annotations, owner));
}
private Executable ParseFor(TokenStream tokens, TopLevelConstruct owner)
{
Token forToken = tokens.PopExpected(this.parser.Keywords.FOR);
tokens.PopExpected("(");
if (!tokens.HasMore)
{
tokens.ThrowEofException();
}
if (this.parser.IsValidIdentifier(tokens.PeekValue()) && tokens.PeekValue(1) == ":")
{
Token iteratorToken = tokens.Pop();
if (this.parser.IsReservedKeyword(iteratorToken.Value))
{
throw new ParserException(iteratorToken, "Cannot use this name for an iterator.");
}
tokens.PopExpected(":");
Expression iterationExpression = this.parser.ExpressionParser.Parse(tokens, owner);
tokens.PopExpected(")");
IList <Executable> body = ParserContext.ParseBlock(parser, tokens, false, owner);
return(new ForEachLoop(forToken, iteratorToken, iterationExpression, body, owner));
}
else
{
List <Executable> init = new List <Executable>();
while (!tokens.PopIfPresent(";"))
{
if (init.Count > 0)
{
tokens.PopExpected(",");
}
init.Add(this.Parse(tokens, true, false, owner));
}
Expression condition = null;
if (!tokens.PopIfPresent(";"))
{
condition = this.parser.ExpressionParser.Parse(tokens, owner);
tokens.PopExpected(";");
}
List <Executable> step = new List <Executable>();
while (!tokens.PopIfPresent(")"))
{
if (step.Count > 0)
{
tokens.PopExpected(",");
}
step.Add(this.Parse(tokens, true, false, owner));
}
IList <Executable> body = ParserContext.ParseBlock(parser, tokens, false, owner);
return(new ForLoop(forToken, init, condition, step, body, owner));
}
}
private FunctionDefinition ParseFunction(
TokenStream tokens,
TopLevelConstruct nullableOwner,
FileScope fileScope,
AnnotationCollection annotations)
{
bool isStatic =
nullableOwner != null &&
nullableOwner is ClassDefinition &&
tokens.PopIfPresent(this.parser.Keywords.STATIC);
Token functionToken = tokens.PopExpected(this.parser.Keywords.FUNCTION);
Token functionNameToken = tokens.Pop();
this.parser.VerifyIdentifier(functionNameToken);
FunctionDefinition fd = new FunctionDefinition(functionToken, parser.CurrentLibrary, nullableOwner, isStatic, functionNameToken, annotations, fileScope);
tokens.PopExpected("(");
List <Token> argNames = new List <Token>();
List <Expression> defaultValues = new List <Expression>();
bool optionalArgFound = false;
while (!tokens.PopIfPresent(")"))
{
if (argNames.Count > 0)
{
tokens.PopExpected(",");
}
Token argName = tokens.Pop();
Expression defaultValue = null;
this.parser.VerifyIdentifier(argName);
if (tokens.PopIfPresent("="))
{
optionalArgFound = true;
defaultValue = this.parser.ExpressionParser.Parse(tokens, fd);
}
else if (optionalArgFound)
{
throw new ParserException(argName, "All optional arguments must come at the end of the argument list.");
}
argNames.Add(argName);
defaultValues.Add(defaultValue);
}
IList <Executable> code = ParserContext.ParseBlock(parser, tokens, true, fd);
fd.ArgNames = argNames.ToArray();
fd.DefaultValues = defaultValues.ToArray();
fd.Code = code.ToArray();
return(fd);
}
private Executable ParseWhile(TokenStream tokens, TopLevelConstruct owner)
{
Token whileToken = tokens.PopExpected(this.parser.Keywords.WHILE);
tokens.PopExpected("(");
Expression condition = this.parser.ExpressionParser.Parse(tokens, owner);
tokens.PopExpected(")");
IList <Executable> body = ParserContext.ParseBlock(parser, tokens, false, owner);
return(new WhileLoop(whileToken, condition, body, owner));
}
private Executable ParseDoWhile(TokenStream tokens, TopLevelConstruct owner)
{
Token doToken = tokens.PopExpected(this.parser.Keywords.DO);
IList <Executable> body = ParserContext.ParseBlock(parser, tokens, true, owner);
tokens.PopExpected(this.parser.Keywords.DO_WHILE_END);
tokens.PopExpected("(");
Expression condition = this.parser.ExpressionParser.Parse(tokens, owner);
tokens.PopExpected(")");
tokens.PopExpected(";");
return(new DoWhileLoop(doToken, body, condition, owner));
}
private Executable ParseIf(TokenStream tokens, TopLevelConstruct owner)
{
Token ifToken = tokens.PopExpected(this.parser.Keywords.IF);
tokens.PopExpected("(");
Expression condition = this.parser.ExpressionParser.Parse(tokens, owner);
tokens.PopExpected(")");
IList <Executable> body = ParserContext.ParseBlock(parser, tokens, false, owner);
IList <Executable> elseBody;
if (tokens.PopIfPresent(this.parser.Keywords.ELSE))
{
elseBody = ParserContext.ParseBlock(parser, tokens, false, owner);
}
else
{
elseBody = new Executable[0];
}
return(new IfStatement(ifToken, condition, body, elseBody, owner));
}
private Executable ParseTry(TokenStream tokens, TopLevelConstruct owner)
{
Token tryToken = tokens.PopExpected(this.parser.Keywords.TRY);
IList <Executable> tryBlock = ParserContext.ParseBlock(parser, tokens, true, owner);
List <Token> catchTokens = new List <Token>();
List <string[]> exceptionTypes = new List <string[]>();
List <Token[]> exceptionTypeTokens = new List <Token[]>();
List <Token> exceptionVariables = new List <Token>();
List <Executable[]> catchBlocks = new List <Executable[]>();
Token finallyToken = null;
IList <Executable> finallyBlock = null;
while (tokens.IsNext(this.parser.Keywords.CATCH))
{
/*
* Parse patterns:
* All exceptions:
* 1a: catch { ... }
* 1b: catch (e) { ... }
*
* A certain exception:
* 2a: catch (ExceptionName) { ... }
* 2b: catch (ExceptionName e) { ... }
*
* Certain exceptions:
* 3a: catch (ExceptionName1 | ExceptionName2) { ... }
* 3b: catch (ExceptionName1 | ExceptionName2 e) { ... }
*
* Non-Context-Free alert:
* Note that if the exception variable does not contain a '.' character, 1b and 2a are
* ambiguous at parse time. Treat them both as 1b and then if the classname resolution
* fails, treat this as a variable.
*
* This is actually kind of bad because a typo in the classname will not be known.
* e.g "catch (Excpetion) {" will compile as a variable called "Excpetion"
*
* End-user workarounds:
* - always use a variable name OR
* - always fully qualify exception types e.g. Core.Exception
* Long-term plan:
* - add warning support and emit warnings for:
* - unused variables
* - style-breaking uppercase variables.
*/
Token catchToken = tokens.PopExpected(this.parser.Keywords.CATCH);
List <string> classNames = new List <string>();
List <Token> classTokens = new List <Token>();
Token variableToken = null;
if (tokens.PopIfPresent("("))
{
// This first one might actually be a variable. Assume class for now and sort it out later.
// (and by "later" I mean the ResolveNames phase)
Token classFirstToken = tokens.Pop();
string className = this.parser.PopClassNameWithFirstTokenAlreadyPopped(tokens, classFirstToken);
classNames.Add(className);
classTokens.Add(classFirstToken);
while (tokens.PopIfPresent("|"))
{
classFirstToken = tokens.Pop();
className = this.parser.PopClassNameWithFirstTokenAlreadyPopped(tokens, classFirstToken);
classNames.Add(className);
classTokens.Add(classFirstToken);
}
if (!tokens.IsNext(")"))
{
variableToken = tokens.Pop();
this.parser.VerifyIdentifier(variableToken);
}
tokens.PopExpected(")");
}
else
{
classNames.Add(null);
classTokens.Add(null);
}
Executable[] catchBlockCode = ParserContext.ParseBlock(parser, tokens, true, owner).ToArray();
catchTokens.Add(catchToken);
exceptionTypes.Add(classNames.ToArray());
exceptionTypeTokens.Add(classTokens.ToArray());
exceptionVariables.Add(variableToken);
catchBlocks.Add(catchBlockCode);
}
if (tokens.IsNext(this.parser.Keywords.FINALLY))
{
finallyToken = tokens.Pop();
finallyBlock = ParserContext.ParseBlock(parser, tokens, true, owner);
}
return(new TryStatement(tryToken, tryBlock, catchTokens, exceptionVariables, exceptionTypeTokens, exceptionTypes, catchBlocks, finallyToken, finallyBlock, owner));
}