Deukhoofd/PorygonLang
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Implements if, elseif and else statements
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Deukhoofd
2019-06-08 14:25:15 +02:00
parent f4a3918947
commit e233616b8e
10 changed files with 187 additions and 2 deletions
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25
src/Parser/Parser.cpp
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@@ -23,6 +23,10 @@ IToken *Parser::Peek() {
return this -> _tokens[_position];
}
IToken *Parser::PeekAt(int offset) {
return this -> _tokens[_position + offset];
}
IToken *Parser::Next() {
this -> _position++;
return this -> _tokens[_position - 1];
@@ -34,6 +38,7 @@ ParsedStatement* Parser::ParseStatement(IToken* current){
case TokenKind ::LocalKeyword: return this -> ParseAssignment(current);
case TokenKind ::FunctionKeyword: return this -> ParseFunctionDeclaration(current);
case TokenKind ::ReturnKeyword: return this->ParseReturnStatement(current);
case TokenKind ::IfKeyword: return this -> ParseIfStatement(current, false);
default: break;
}
if (this->Peek()->GetKind() == TokenKind::AssignmentToken){
@@ -144,6 +149,26 @@ ParsedStatement* Parser::ParseReturnStatement(IToken* current){
return new ParsedReturnStatement(expression, start, expression->GetEndPosition() - start);
}
ParsedStatement* Parser::ParseIfStatement(IToken* current, bool isElseIf){
auto condition = this->ParseExpression(this->Next());
auto next = this -> Next();
if (next->GetKind() != TokenKind::ThenKeyword){
this -> ScriptData -> Diagnostics -> LogError(DiagnosticCode::UnexpectedToken, next->GetStartPosition(), next->GetLength());
return new ParsedBadStatement(next->GetStartPosition(), next->GetLength());
}
auto block = this -> ParseBlock({TokenKind ::EndKeyword, TokenKind ::ElseKeyword, TokenKind ::ElseIfKeyword});
auto closeToken = this->PeekAt(-1);
auto start = current->GetStartPosition();
if (closeToken->GetKind() == TokenKind::ElseIfKeyword){
auto elseIfStatement = this -> ParseIfStatement(closeToken, true);
return new ParsedConditionalStatement(condition, block, elseIfStatement, start, elseIfStatement->GetEndPosition() - start);
} else if (closeToken->GetKind() == TokenKind::ElseKeyword){
auto elseStatement = this -> ParseBlock({TokenKind ::EndKeyword});
return new ParsedConditionalStatement(condition, block, elseStatement, start, elseStatement->GetEndPosition() - start);
}
return new ParsedConditionalStatement(condition, block, start, block->GetEndPosition() - start);
}
ParsedExpression* Parser::ParseExpression(IToken* current){
auto expression = this -> ParseBinaryExpression(current, OperatorPrecedence::No);
auto peekKind = this->Peek()->GetKind();