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parser.cpp
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parser.cpp
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#include <cassert>
#include <stdexcept>
#include "parser.h"
#include "tokenlist.h"
#include "ast.h"
#include "statement.h"
#include "expression.h"
AST::Program *Parser::Parse( TokenList *tokens ) {
tokens_ = tokens;
funkshuns_.clear();
lineGood_ = true;
tokens_->StartIterating();
AcceptToken( TokenType::HAI );
// Not really used right now; will possibly be useful in future when
// grammar is altered in future (e.g. possibly range-loop construct).
if( tokens_->PeekToken().type == TokenType::NUMBAR_LITERAL ) {
const std::string lolcodeVersion = tokens_->PeekToken().string;
if( lolcodeVersion != "1.2" ) {
return nullptr;
}
tokens_->AdvanceToNextToken();
}
lolcodeVersion_ = LolcodeVersion::V12;
AcceptToken( TokenType::LINE_DELIMITER );
AST::StatementBlock *body = ParseProgramBody();
if( body == nullptr ) {
while( !funkshuns_.empty() ) {
delete funkshuns_.back();
funkshuns_.pop_back();
}
return nullptr;
}
AST::Program *program = new AST::Program( funkshuns_, body );
AcceptToken( TokenType::KTHXBYE );
if( !AcceptToken( TokenType::LINE_DELIMITER ) ||
!AcceptToken( TokenType::END_OF_FILE ) ) {
tokens_->AdvanceToNextToken();
delete program;
return nullptr;
}
return program;
}
AST::StatementBlock *Parser::ParseStatementBlock(
const StatementBlockType bodyType ) {
AST::StatementBlock *stmtBlock = new AST::StatementBlock();
while( true ) {
AST::Statement *stmt = nullptr;
switch( tokens_->PeekToken().type ) {
case TokenType::KTHXBYE:
if( bodyType == StatementBlockType::PROGRAM_BODY ) {
return stmtBlock;
}
break;
case TokenType::IF:
if( bodyType == StatementBlockType::FUNKSHUN_BODY ) {
return stmtBlock;
}
break;
case TokenType::MEBBE:
case TokenType::NO:
switch( bodyType ) {
case StatementBlockType::ORLY_YA:
case StatementBlockType::ORLY_MEBBE:
return stmtBlock;
default:
break;
}
break;
case TokenType::OIC:
switch( bodyType ) {
case StatementBlockType::ORLY_YA:
case StatementBlockType::ORLY_MEBBE:
case StatementBlockType::ORLY_NO:
case StatementBlockType::WTF_OMG:
case StatementBlockType::WTF_OMGWTF:
return stmtBlock;
default:
break;
}
break;
case TokenType::OMG:
case TokenType::OMGWTF:
if( bodyType == StatementBlockType::WTF_OMG ) {
return stmtBlock;
}
break;
case TokenType::KTHX:
switch( bodyType ) {
case StatementBlockType::PLZ_BODY:
case StatementBlockType::PLZ_ONOES:
case StatementBlockType::PLZ_OWEL:
return stmtBlock;
default:
break;
}
break;
case TokenType::O:
switch( tokens_->PeekToken( 1 ).type ) {
case TokenType::RLY:
stmt = ParseORlyBlock();
break;
case TokenType::NOES:
case TokenType::WEL:
switch( bodyType ) {
case StatementBlockType::PLZ_BODY:
case StatementBlockType::PLZ_ONOES:
return stmtBlock;
default:
break;
}
break;
default:
break;
}
break;
case TokenType::WTF:
stmt = ParseWtfBlock();
break;
case TokenType::IM:
switch( tokens_->PeekToken( 1 ).type ) {
case TokenType::IN:
stmt = ParseLoopBlock();
break;
case TokenType::OUTTA:
if( bodyType == StatementBlockType::LOOP_BODY ) {
return stmtBlock;
}
break;
default:
break;
}
break;
case TokenType::HOW:
if( bodyType == StatementBlockType::PROGRAM_BODY ) {
AST::FunkshunBlock *funkshun = ParseFunkshunBlock();
if( funkshun != nullptr ) {
funkshuns_.push_back( funkshun );
stmt = new AST::FunkshunDeclare(
funkshun->GetName()->Clone() );
}
}
break;
case TokenType::PLZ:
stmt = ParsePlzBlock();
break;
default:
stmt = ParseStatement();
break;
}
if( stmt == nullptr ) {
delete stmtBlock;
return nullptr;
}
stmtBlock->AddStatement( stmt );
}
}
AST::StatementBlock *Parser::ParseFunkshunBody() {
AST::StatementBlock *funkshunBody =
ParseStatementBlock( StatementBlockType::FUNKSHUN_BODY );
funkshunBody->AddStatement( new AST::FunkshunReturn( new AST::ItIdentifier() ) );
return funkshunBody;
}
AST::ORlyBlock *Parser::ParseORlyBlock() {
AcceptToken( TokenType::O );
AcceptToken( TokenType::RLY );
AcceptToken( TokenType::QUESTION );
if( !AcceptToken( TokenType::LINE_DELIMITER ) ) {
tokens_->AdvanceToNextToken();
return nullptr;
}
AcceptToken( TokenType::YA );
AcceptToken( TokenType::RLY );
if( !AcceptToken( TokenType::LINE_DELIMITER ) ) {
tokens_->AdvanceToNextToken();
return nullptr;
}
AST::StatementBlock *yaBody = ParseORlyYaBody();
if( yaBody == nullptr ) {
return nullptr;
}
AST::ORlyBlock *oRlyBlock = new AST::ORlyBlock( yaBody );
while( tokens_->PeekToken().type == TokenType::MEBBE ) {
tokens_->AdvanceToNextToken();
AST::Expression *cond = ParseExpression();
if( cond == nullptr ) {
delete oRlyBlock;
return nullptr;
}
if( !AcceptToken( TokenType::LINE_DELIMITER ) ) {
tokens_->AdvanceToNextToken();
delete cond;
delete oRlyBlock;
return nullptr;
}
AST::StatementBlock *mebbeBody = ParseORlyMebbeBody();
if( mebbeBody == nullptr ) {
delete cond;
delete oRlyBlock;
return nullptr;
}
oRlyBlock->AddMebbeBlock( cond, mebbeBody );
}
if( tokens_->PeekToken().type == TokenType::NO ) {
tokens_->AdvanceToNextToken();
AcceptToken( TokenType::WAI );
if( !AcceptToken( TokenType::LINE_DELIMITER ) ) {
tokens_->AdvanceToNextToken();
delete oRlyBlock;
return nullptr;
}
AST::StatementBlock *noBody = ParseORlyNoBody();
if( noBody == nullptr ) {
delete oRlyBlock;
return nullptr;
}
oRlyBlock->SetNoWaiBody( noBody );
}
AcceptToken( TokenType::OIC );
if( !AcceptToken( TokenType::LINE_DELIMITER ) ) {
tokens_->AdvanceToNextToken();
delete oRlyBlock;
return nullptr;
}
return oRlyBlock;
}
AST::WtfBlock *Parser::ParseWtfBlock() {
AcceptToken( TokenType::WTF );
AcceptToken( TokenType::QUESTION );
if( !AcceptToken( TokenType::LINE_DELIMITER ) ) {
tokens_->AdvanceToNextToken();
return nullptr;
}
if( tokens_->PeekToken().type != TokenType::OMG ) {
return nullptr;
}
AST::WtfBlock *wtfBlock = new AST::WtfBlock();
do {
tokens_->AdvanceToNextToken();
AST::Literal *literal = ParseLiteral();
if( literal == nullptr ) {
delete wtfBlock;
return nullptr;
}
if( !AcceptToken( TokenType::LINE_DELIMITER ) ) {
tokens_->AdvanceToNextToken();
delete literal;
delete wtfBlock;
return nullptr;
}
AST::StatementBlock *omgBody = ParseWtfOmgBody();
if( omgBody == nullptr ) {
delete literal;
delete wtfBlock;
return nullptr;
}
wtfBlock->AddOmgBlock( literal, omgBody );
} while( tokens_->PeekToken().type == TokenType::OMG );
if( tokens_->PeekToken().type == TokenType::OMGWTF ) {
tokens_->AdvanceToNextToken();
if( !AcceptToken( TokenType::LINE_DELIMITER ) ) {
tokens_->AdvanceToNextToken();
delete wtfBlock;
return nullptr;
}
AST::StatementBlock *omgwtfBody = ParseWtfOmgwtfBody();
if( omgwtfBody == nullptr ) {
delete wtfBlock;
return nullptr;
}
wtfBlock->SetOmgwtfBody( omgwtfBody );
}
AcceptToken( TokenType::OIC );
if( !AcceptToken( TokenType::LINE_DELIMITER ) ) {
tokens_->AdvanceToNextToken();
delete wtfBlock;
return nullptr;
}
return wtfBlock;
}
AST::LoopBlock *Parser::ParseLoopBlock() {
AcceptToken( TokenType::IM );
AcceptToken( TokenType::IN );
if( !AcceptToken( TokenType::YR ) ) {
tokens_->AdvanceToNextToken();
return nullptr;
}
AST::LiteralIdentifier *id = ParseLiteralIdentifier();
if( id == nullptr ) {
return nullptr;
}
AST::LoopBlock *loopBlock = nullptr;
switch( tokens_->PeekToken().type ) {
case TokenType::LINE_DELIMITER:
loopBlock = new AST::ForLoopBlock( id );
break;
case TokenType::WATCHIN:
{
AST::RangeLoopBlock *rangeLoopBlock = new AST::RangeLoopBlock( id );
tokens_->AdvanceToNextToken();
bool iteratorIsLocal = false;
if( tokens_->PeekToken().type == TokenType::YR ) {
tokens_->AdvanceToNextToken();
iteratorIsLocal = true;
}
AST::Identifier *iterator = ParseLoopVarIdentifier();
if( iterator == nullptr ) {
delete rangeLoopBlock;
return nullptr;
}
rangeLoopBlock->SetLoopVariable( iterator, iteratorIsLocal );
if( !AcceptToken( TokenType::FROM ) ) {
tokens_->AdvanceToNextToken();
delete rangeLoopBlock;
return nullptr;
}
AST::Expression *bukkitRef = ParseBukkitReference();
if( bukkitRef == nullptr ) {
delete rangeLoopBlock;
return nullptr;
}
rangeLoopBlock->SetBukkitRef( bukkitRef );
loopBlock = rangeLoopBlock;
break;
}
default:
{
AST::ForLoopBlock *forLoopBlock = new AST::ForLoopBlock( id );
AST::UnaryExpression *unaryIncExpr = nullptr;
AST::FunkshunCall *funkshunIncExpr = nullptr;
switch( tokens_->PeekToken().type ) {
case TokenType::WITH:
tokens_->AdvanceToNextToken();
break;
case TokenType::UPPIN:
unaryIncExpr = new AST::UppinExpression();
forLoopBlock->SetLoopVariableIncExpr( unaryIncExpr );
tokens_->AdvanceToNextToken();
break;
case TokenType::NERFIN:
unaryIncExpr = new AST::NerfinExpression();
forLoopBlock->SetLoopVariableIncExpr( unaryIncExpr );
tokens_->AdvanceToNextToken();
break;
default:
{
unaryIncExpr = ParseUnaryOperator();
if( unaryIncExpr != nullptr ) {
forLoopBlock->SetLoopVariableIncExpr( unaryIncExpr );
break;
}
// TODO: Expand to support indirect function calls via SRS.
AST::LiteralIdentifier *funkshunId = ParseLiteralIdentifier();
if( funkshunId == nullptr ) {
delete forLoopBlock;
return nullptr;
}
funkshunIncExpr = new AST::FunkshunCall( funkshunId );
forLoopBlock->SetLoopVariableIncExpr( funkshunIncExpr );
break;
}
}
bool loopVarIsLocal = false;
if( tokens_->PeekToken().type == TokenType::YR ) {
tokens_->AdvanceToNextToken();
loopVarIsLocal = true;
}
AST::Identifier *loopVar = ParseLoopVarIdentifier();
if( loopVar == nullptr ) {
delete forLoopBlock;
return nullptr;
}
forLoopBlock->SetLoopVariable( loopVar, loopVarIsLocal );
if( unaryIncExpr != nullptr ) {
unaryIncExpr->SetOperand( loopVar->Clone() );
} else if( funkshunIncExpr != nullptr ) {
funkshunIncExpr->AddOperand( loopVar->Clone() );
}
if( tokens_->PeekToken().type == TokenType::FROM ) {
tokens_->AdvanceToNextToken();
AST::Expression *initExpr = ParseExpression();
if( initExpr == nullptr ) {
delete forLoopBlock;
return nullptr;
}
forLoopBlock->SetLoopVariableInitExpr( initExpr );
}
AST::UnaryExpression *testExpr = nullptr;
switch( tokens_->PeekToken().type ) {
case TokenType::TIL:
testExpr = new AST::TilExpression();
break;
case TokenType::WILE:
testExpr = new AST::WileExpression();
break;
default:
break;
}
if( testExpr != nullptr ) {
tokens_->AdvanceToNextToken();
AST::Expression *expr = ParseExpression();
if( expr == nullptr ) {
delete testExpr;
delete forLoopBlock;
return nullptr;
}
testExpr->SetOperand( expr );
forLoopBlock->SetLoopGuard( testExpr );
}
loopBlock = forLoopBlock;
break;
}
}
assert( loopBlock != nullptr );
if( !AcceptToken( TokenType::LINE_DELIMITER ) ) {
tokens_->AdvanceToNextToken();
delete loopBlock;
return nullptr;
}
AST::StatementBlock *body = ParseLoopBody();
if( body == nullptr ) {
delete loopBlock;
return nullptr;
}
loopBlock->SetBody( body );
AcceptToken( TokenType::IM );
AcceptToken( TokenType::OUTTA );
if( !AcceptToken( TokenType::YR ) ) {
tokens_->AdvanceToNextToken();
delete loopBlock;
return nullptr;
}
id = ParseLiteralIdentifier();
if( id == nullptr ) {
// TODO: Should also check for match with loop begin identifier.
delete loopBlock;
return nullptr;
}
if( !AcceptToken( TokenType::LINE_DELIMITER ) ) {
tokens_->AdvanceToNextToken();
delete loopBlock;
return nullptr;
}
return loopBlock;
}
AST::FunkshunBlock *Parser::ParseFunkshunBlock() {
AcceptToken( TokenType::HOW );
AcceptToken( TokenType::IZ );
if( !AcceptToken( TokenType::I ) ) {
tokens_->AdvanceToNextToken();
return nullptr;
}
AST::LiteralIdentifier *id = ParseLiteralIdentifier();
if( id == nullptr ) {
return nullptr;
}
AST::FunkshunBlock *funkshun = new AST::FunkshunBlock( id );
bool isPassByRef = false;
switch( tokens_->PeekToken().type ) {
case TokenType::DAT:
isPassByRef = true;
case TokenType::YR:
tokens_->AdvanceToNextToken();
id = ParseLiteralIdentifier();
if( id == nullptr ) {
delete funkshun;
return nullptr;
}
funkshun->AddParameter( id, isPassByRef );
while( tokens_->PeekToken().type == TokenType::AN ) {
tokens_->AdvanceToNextToken();
switch( tokens_->PeekToken().type ) {
case TokenType::DAT:
isPassByRef = true;
break;
case TokenType::YR:
isPassByRef = false;
break;
default:
tokens_->SkipToNextLine();
delete funkshun;
return nullptr;
}
tokens_->AdvanceToNextToken();
id = ParseLiteralIdentifier();
if( id == nullptr ) {
delete funkshun;
return nullptr;
}
funkshun->AddParameter( id, isPassByRef );
}
break;
default:
break;
}
if( !AcceptToken( TokenType::LINE_DELIMITER ) ) {
tokens_->AdvanceToNextToken();
delete funkshun;
return nullptr;
}
AST::StatementBlock *body = ParseFunkshunBody();
if( body == nullptr ) {
delete funkshun;
return nullptr;
}
funkshun->SetBody( body );
AcceptToken( TokenType::IF );
AcceptToken( TokenType::U );
AcceptToken( TokenType::SAY );
AcceptToken( TokenType::SO );
if( !AcceptToken( TokenType::LINE_DELIMITER ) ) {
tokens_->AdvanceToNextToken();
delete funkshun;
return nullptr;
}
return funkshun;
}
AST::PlzBlock *Parser::ParsePlzBlock() {
AcceptToken( TokenType::PLZ );
if( !AcceptToken( TokenType::LINE_DELIMITER ) ) {
tokens_->AdvanceToNextToken();
return nullptr;
}
// TODO: Implement support for PLZ construct.
return nullptr;
AST::StatementBlock *tryBody = ParsePlzBody();
if( tryBody == nullptr ) {
return nullptr;
}
AST::PlzBlock *plzBlock = new AST::PlzBlock( tryBody );
while( tokens_->PeekToken().type == TokenType::O &&
tokens_->PeekToken( 1 ).type == TokenType::NOES ) {
tokens_->AdvanceToNextToken( 2 );
AST::Expression *expr = ParseExpression();
if( expr == nullptr ) {
delete plzBlock;
return nullptr;
}
if( !AcceptToken( TokenType::LINE_DELIMITER ) ) {
tokens_->AdvanceToNextToken();
delete expr;
delete plzBlock;
return nullptr;
}
AST::StatementBlock *oNoesBody = ParsePlzONoesBody();
if( oNoesBody == nullptr ) {
delete expr;
delete plzBlock;
return nullptr;
}
plzBlock->AddONoesBlock( expr, oNoesBody );
}
if( tokens_->PeekToken().type == TokenType::O ) {
AcceptToken( TokenType::WEL );
if( !AcceptToken( TokenType::LINE_DELIMITER ) ) {
tokens_->AdvanceToNextToken();
delete plzBlock;
return nullptr;
}
AST::StatementBlock *oWelBody = ParsePlzOWelBody();
if( oWelBody == nullptr ) {
delete plzBlock;
return nullptr;
}
plzBlock->SetOWelBody( oWelBody );
}
AcceptToken( TokenType::KTHX );
if( !AcceptToken( TokenType::LINE_DELIMITER ) ) {
tokens_->AdvanceToNextToken();
delete plzBlock;
return nullptr;
}
return plzBlock;
}
AST::Statement *Parser::ParseStatement() {
AST::Statement *stmt = nullptr;
bool isSlotIdentifier = true;
switch( tokens_->PeekToken().type ) {
case TokenType::I:
switch( tokens_->PeekToken( 1 ).type ) {
case TokenType::HAS:
stmt = ParseVarDeclare();
break;
case TokenType::IZ:
{
AST::FunkshunCall *funkshunCall = ParseFunkshunCall();
if( funkshunCall == nullptr ) {
break;
}
AST::VarAssign *varAssign =
AST::VarAssign::CreateImplicitAssign();
varAssign->SetAssignValue( funkshunCall );
stmt = varAssign;
break;
}
default:
tokens_->SkipToNextLine();
return nullptr;
}
break;
case TokenType::FOUND:
stmt = ParseFunkshunReturn();
break;
case TokenType::VISIBLE:
stmt = ParseVisibleStatement();
break;
case TokenType::GIMMEH:
stmt = ParseGimmehStatement();
break;
case TokenType::GTFO:
// TODO: To add support for breaking out of outer loop, probably want
// to refactor this out to another function.
tokens_->AdvanceToNextToken();
stmt = new AST::GtfoStatement();
break;
case TokenType::WHATEVR:
tokens_->AdvanceToNextToken();
stmt = new AST::WhatevrStatement();
break;
case TokenType::IDENTIFIER:
case TokenType::SRS:
isSlotIdentifier = false;
case TokenType::SLOT:
{
AST::Identifier *id = ParseExplicitIdentifier();
if( id == nullptr ) {
return nullptr;
}
switch( tokens_->PeekToken().type ) {
case TokenType::R:
if( isSlotIdentifier ) {
assert( dynamic_cast<AST::SlotIdentifier *>( id ) != nullptr );
static_cast<AST::SlotIdentifier *>( id )->SetSafety( false );
}
stmt = ParseVarAssign( id );
break;
case TokenType::IS:
stmt = ParseVarCast( id );
break;
default:
{
AST::VarAssign *varAssign =
AST::VarAssign::CreateImplicitAssign();
varAssign->SetAssignValue( id );
stmt = varAssign;
break;
}
}
break;
}
default:
{
AST::Expression *expr = ParseExpression();
if( expr == nullptr ) {
break;
}
AST::VarAssign *varAssign = AST::VarAssign::CreateImplicitAssign();
varAssign->SetAssignValue( expr );
stmt = varAssign;
break;
}
}
if( stmt == nullptr ) {
return nullptr;
}
if( !AcceptToken( TokenType::LINE_DELIMITER ) ) {
tokens_->AdvanceToNextToken();
delete stmt;
return nullptr;
}
return stmt;
}
AST::VarDeclare *Parser::ParseVarDeclare() {
AcceptToken( TokenType::I );
AcceptToken( TokenType::HAS );
if( !AcceptToken( TokenType::A ) ) {
tokens_->AdvanceToNextToken();
return nullptr;
}
TokenType varDeclType = tokens_->PeekToken().type;
AST::Identifier *id = ParseExplicitIdentifier();
if( id == nullptr ) {
return nullptr;
}
AST::VarDeclare *varDecl;
switch( varDeclType ) {
case TokenType::IDENTIFIER:
assert( dynamic_cast<AST::LiteralIdentifier *>( id ) != nullptr );
varDecl = new AST::LiteralVarDeclare(
static_cast<AST::LiteralIdentifier *>( id ) );
break;
case TokenType::SRS:
assert( dynamic_cast<AST::SrsIdentifier *>( id ) != nullptr );
varDecl = new AST::SrsVarDeclare(
static_cast<AST::SrsIdentifier *>( id ) );
break;
case TokenType::SLOT:
{
assert( dynamic_cast<AST::SlotIdentifier *>( id ) != nullptr );
AST::SlotIdentifier *slotId = static_cast<AST::SlotIdentifier *>( id );
varDecl = new AST::SlotVarDeclare( slotId );
slotId->SetSafety( false );
break;
}
default:
return nullptr;
}
if( tokens_->PeekToken().type == TokenType::ITZ ) {
tokens_->AdvanceToNextToken();
if( tokens_->PeekToken().type == TokenType::A ) {
tokens_->AdvanceToNextToken();
AST::TypeIdentifier *type = ParseTypeIdentifier();
if( type == nullptr ) {
delete varDecl;
return nullptr;
}
varDecl->SetInitType( type );
} else {
AST::Expression *expr = ParseExpression();
if( expr == nullptr ) {
delete varDecl;
return nullptr;
}
varDecl->SetInitValue( expr );
}
}
return varDecl;
}
AST::VarAssign *Parser::ParseVarAssign( AST::Identifier *id ) {
AST::VarAssign *varAssign = new AST::VarAssign( id );
if( !AcceptToken( TokenType::R ) ) {
tokens_->AdvanceToNextToken();
delete varAssign;
return nullptr;
}
AST::Expression *expr = ParseExpression();
if( expr == nullptr ) {
delete varAssign;
return nullptr;
}
varAssign->SetAssignValue( expr );
return varAssign;
}
AST::VarAssign *Parser::ParseVarCast( AST::Identifier *id ) {
AST::VarAssign *varCast = new AST::VarAssign( id );
AcceptToken( TokenType::IS );
AcceptToken( TokenType::NOW );
if( !AcceptToken( TokenType::A ) ) {
tokens_->AdvanceToNextToken();
delete varCast;
return nullptr;
}
AST::TypeIdentifier *type = ParseTypeIdentifier();
if( type == nullptr ) {
delete varCast;
return nullptr;
}
AST::MaekExpression *castExpr = new AST::MaekExpression( id->Clone() );
castExpr->SetCastTargetType( type );
varCast->SetAssignValue( castExpr );
return varCast;
}
AST::VisibleStatement *Parser::ParseVisibleStatement() {
if( !AcceptToken( TokenType::VISIBLE ) ) {
tokens_->AdvanceToNextToken();
return nullptr;
}
AST::Expression *expr = ParseExpression();
if( expr == nullptr ) {
return nullptr;
}
AST::VisibleStatement *visibleStmt = new AST::VisibleStatement( expr );
while( tokens_->PeekToken().type != TokenType::LINE_DELIMITER &&
tokens_->PeekToken().type != TokenType::EXCLAMATION ) {
expr = ParseExpression();
if( expr == nullptr ) {
delete visibleStmt;
return nullptr;
}
visibleStmt->AddExpression( expr );
}
if( tokens_->PeekToken().type == TokenType::EXCLAMATION ) {
tokens_->AdvanceToNextToken();
if( tokens_->PeekToken().type != TokenType::LINE_DELIMITER ) {
delete visibleStmt;
return nullptr;
}
visibleStmt->SetSuppressNewline();
}
return visibleStmt;
}
AST::GimmehStatement *Parser::ParseGimmehStatement() {
if( !AcceptToken( TokenType::GIMMEH ) ) {
tokens_->AdvanceToNextToken();
return nullptr;
}
bool isLong = false;
if( tokens_->PeekToken().type == TokenType::LONG ) {
isLong = true;
tokens_->AdvanceToNextToken();
}
AST::Identifier *id = ParseExplicitIdentifier();
if( id == nullptr ) {
return nullptr;
}
return new AST::GimmehStatement( id, isLong );
}
AST::FunkshunReturn *Parser::ParseFunkshunReturn() {
AcceptToken( TokenType::FOUND );
if( !AcceptToken( TokenType::YR ) ) {
tokens_->AdvanceToNextToken();
return nullptr;
}
AST::Expression *retExpr = ParseExpression();
if( retExpr == nullptr ) {
return nullptr;
}
return new AST::FunkshunReturn( retExpr );
}
AST::Expression *Parser::ParseExpression() {
switch( tokens_->PeekToken().type ) {
case TokenType::IDENTIFIER:
case TokenType::SRS:
case TokenType::IT:
case TokenType::SLOT:
return ParseIdentifier();
case TokenType::NOOB:
case TokenType::WIN:
case TokenType::FAIL:
case TokenType::YARN_LITERAL:
case TokenType::NUMBR_LITERAL:
case TokenType::NUMBAR_LITERAL:
case TokenType::MINUS_SIGN:
return ParseLiteral();
case TokenType::I:
return ParseFunkshunCall();
case TokenType::MAEK:
return ParseMaekExpression();
default:
break;
}
AST::UnaryExpression *unaryExpr = ParseUnaryOperator();
if( unaryExpr != nullptr ) {
AST::Expression *operand = ParseExpression();
if( operand == nullptr ) {
delete unaryExpr;
return nullptr;
}
unaryExpr->SetOperand( operand );
return unaryExpr;
}
AST::BinaryExpression *binaryExpr = ParseBinaryOperator();
if( binaryExpr != nullptr ) {
AST::Expression *operand = ParseExpression();
if( operand == nullptr ) {
delete binaryExpr;
return nullptr;
}
binaryExpr->SetLeftOperand( operand );
if( tokens_->PeekToken().type == TokenType::AN ) {
tokens_->AdvanceToNextToken();
}
operand = ParseExpression();
if( operand == nullptr ) {
delete binaryExpr;
return nullptr;
}
binaryExpr->SetRightOperand( operand );
return binaryExpr;
}
AST::NaryExpression *naryExpr = ParseNaryOperator();
if( naryExpr != nullptr ) {
AST::Expression *operand = ParseExpression();
if( operand == nullptr ) {
delete naryExpr;
return nullptr;
}