631 lines
22 KiB
C++
631 lines
22 KiB
C++
#include "Parser.h"
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#include "Parser/Expression/ExpressionGrouping.h"
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#include "Parser/Expression/ExpressionLiteral.h"
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#include "Parser/Expression/ExpressionVariable.h"
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#include "Parser/Expression/ExpressionCall.h"
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#include "Parser/Expression/ExpressionIfElse.h"
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#include "Parser/Expression/ExpressionBinary.h"
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#include "Parser/Expression/ExpressionBlock.h"
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#include "Parser/Expression/ExpressionInvalid.h"
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#include "Parser/Statement/StatementFunction.h"
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#include "Parser/Statement/StatementVariable.h"
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#include "Parser/Statement/StatementAssignment.h"
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#include "Parser/Statement/StatementReturn.h"
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#include "Parser/Statement/StatementExpression.h"
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#include "Parser/Statement/StatementMetaExternFunction.h"
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#include "Parser/Statement/StatementBlock.h"
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#include "Parser/Statement/StatementRepeat.h"
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#include "Parser/Statement/StatementInvalid.h"
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Parser::Parser(vector<shared_ptr<Token>> tokens): tokens(tokens) {
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}
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vector<shared_ptr<Statement>> Parser::getStatements() {
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vector<shared_ptr<Statement>> statements;
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while (!tryMatchingTokenKinds({TokenKind::END}, true, false)) {
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shared_ptr<Statement> statement = nextStatement();
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// Abort parsing if we got an error
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if (!statement->isValid()) {
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cerr << statement->toString(0);
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exit(1);
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}
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statements.push_back(statement);
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// Expect new line after statement
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if (!tryMatchingTokenKinds({TokenKind::NEW_LINE}, true, true)) {
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cerr << "Expected new line" << endl;
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exit(1);
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}
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}
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return statements;
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}
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//
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// Statement
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//
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shared_ptr<Statement> Parser::nextStatement() {
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shared_ptr<Statement> statement;
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statement = matchStatementFunction();
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if (statement != nullptr)
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return statement;
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statement = matchStatementVariable();
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if (statement != nullptr)
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return statement;
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statement = matchStatementMetaExternFunction();
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if (statement != nullptr)
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return statement;
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return matchStatementInvalid("Unexpected token");
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}
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shared_ptr<Statement> Parser::nextInBlockStatement() {
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shared_ptr<Statement> statement;
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statement = matchStatementVariable();
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if (statement != nullptr)
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return statement;
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statement = matchStatementAssignment();
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if (statement != nullptr)
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return statement;
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statement = matchStatementReturn();
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if (statement != nullptr)
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return statement;
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statement = matchStatementRepeat();
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if (statement != nullptr)
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return statement;
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statement = matchStatementExpression();
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if (statement != nullptr)
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return statement;
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return matchStatementInvalid("Unexpected token");
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}
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shared_ptr<Statement> Parser::matchStatementMetaExternFunction() {
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if (!tryMatchingTokenKinds({TokenKind::M_EXTERN, TokenKind::IDENTIFIER, TokenKind::FUNCTION}, true, false))
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return nullptr;
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string name;
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vector<pair<string, ValueType>> arguments;
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ValueType returnType = ValueType::NONE;
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currentIndex++; // skip meta
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shared_ptr<Token> identifierToken = tokens.at(currentIndex++);
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currentIndex++; // skip fun
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// arguments
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if (tryMatchingTokenKinds({TokenKind::COLON}, true, true)) {
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do {
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tryMatchingTokenKinds({TokenKind::NEW_LINE}, true, true); // skip new line
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if (!tryMatchingTokenKinds({TokenKind::IDENTIFIER, TokenKind::TYPE}, true, false))
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return matchStatementInvalid("Expected function argument");
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shared_ptr<Token> identifierToken = tokens.at(currentIndex++);
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shared_ptr<Token> typeToken = tokens.at(currentIndex++);
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optional<ValueType> argumentType = valueTypeForToken(typeToken);
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if (!argumentType)
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return matchStatementInvalid("Invalid argument type");
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arguments.push_back(pair<string, ValueType>(identifierToken->getLexme(), *argumentType));
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} while (tryMatchingTokenKinds({TokenKind::COMMA}, true, true));
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}
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// Return type
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if (tryMatchingTokenKinds({TokenKind::RIGHT_ARROW}, true, true)) {
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tryMatchingTokenKinds({TokenKind::NEW_LINE}, true, true); // skip new line
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shared_ptr<Token> typeToken = tokens.at(currentIndex);
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optional<ValueType> type = valueTypeForToken(typeToken);
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if (!type)
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return matchStatementInvalid("Expected return type");
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returnType = *type;
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currentIndex++; // type
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}
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return make_shared<StatementMetaExternFunction>(identifierToken->getLexme(), arguments, returnType);
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}
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shared_ptr<Statement> Parser::matchStatementVariable() {
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if (!tryMatchingTokenKinds({TokenKind::IDENTIFIER, TokenKind::TYPE}, true, false))
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return nullptr;
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shared_ptr<Token> identifierToken = tokens.at(currentIndex++);
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shared_ptr<Token> valueTypeToken = tokens.at(currentIndex);
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ValueType valueType;
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if (valueTypeToken->getLexme().compare("bool") == 0)
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valueType = ValueType::BOOL;
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else if (valueTypeToken->getLexme().compare("sint32") == 0)
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valueType = ValueType::SINT32;
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else if (valueTypeToken->getLexme().compare("real32") == 0)
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valueType = ValueType::REAL32;
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else
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return matchStatementInvalid("Invalid type");
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currentIndex++; // type
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// Expect left arrow
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if (!tryMatchingTokenKinds({TokenKind::LEFT_ARROW}, true, true))
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return matchStatementInvalid("Expected left arrow");
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shared_ptr<Expression> expression = nextExpression();
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if (expression == nullptr || !expression->isValid())
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return matchStatementInvalid("Invalid expression");
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return make_shared<StatementVariable>(identifierToken->getLexme(), valueType, expression);
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}
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shared_ptr<Statement> Parser::matchStatementFunction() {
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if (!tryMatchingTokenKinds({TokenKind::IDENTIFIER, TokenKind::FUNCTION}, true, false))
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return nullptr;
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string name;
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vector<pair<string, ValueType>> arguments;
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ValueType returnType = ValueType::NONE;
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shared_ptr<Statement> statementBlock;
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// name
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name = tokens.at(currentIndex++)->getLexme();
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currentIndex++; // skip fun
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// arguments
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if (tryMatchingTokenKinds({TokenKind::COLON}, true, true)) {
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do {
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tryMatchingTokenKinds({TokenKind::NEW_LINE}, true, true); // skip new line
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if (!tryMatchingTokenKinds({TokenKind::IDENTIFIER, TokenKind::TYPE}, true, false))
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return matchStatementInvalid("Expected function argument");
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shared_ptr<Token> identifierToken = tokens.at(currentIndex++);
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shared_ptr<Token> typeToken = tokens.at(currentIndex++);
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optional<ValueType> argumentType = valueTypeForToken(typeToken);
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if (!argumentType)
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return matchStatementInvalid("Invalid argument type");
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arguments.push_back(pair<string, ValueType>(identifierToken->getLexme(), *argumentType));
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} while (tryMatchingTokenKinds({TokenKind::COMMA}, true, true));
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}
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// return type
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if (tryMatchingTokenKinds({TokenKind::RIGHT_ARROW}, true, true)) {
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tryMatchingTokenKinds({TokenKind::NEW_LINE}, true, true); // skip new line
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shared_ptr<Token> typeToken = tokens.at(currentIndex);
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optional<ValueType> type = valueTypeForToken(typeToken);
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if (!type)
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return matchStatementInvalid("Expected return type");
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returnType = *type;
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currentIndex++; // type
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}
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// consume new line
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if (!tryMatchingTokenKinds({TokenKind::NEW_LINE}, true, true))
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return matchStatementInvalid("Expected new line after function declaration");
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// block
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statementBlock = matchStatementBlock({TokenKind::SEMICOLON});
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if (statementBlock == nullptr || !statementBlock->isValid())
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return statementBlock ?: matchStatementInvalid();
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if(!tryMatchingTokenKinds({TokenKind::SEMICOLON}, false, true))
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return matchStatementInvalid("Expected a \";\" after a function declaration");
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return make_shared<StatementFunction>(name, arguments, returnType, dynamic_pointer_cast<StatementBlock>(statementBlock));
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}
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shared_ptr<Statement> Parser::matchStatementBlock(vector<TokenKind> terminalTokenKinds) {
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vector<shared_ptr<Statement>> statements;
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while (!tryMatchingTokenKinds(terminalTokenKinds, false, false)) {
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shared_ptr<Statement> statement = nextInBlockStatement();
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if (statement == nullptr || !statement->isValid())
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return statement ?: matchStatementInvalid("Expected statement");
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statements.push_back(statement);
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if (tryMatchingTokenKinds(terminalTokenKinds, false, false))
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break;
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// except new line
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if (!tryMatchingTokenKinds({TokenKind::NEW_LINE}, true, true))
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return matchStatementInvalid("Expected new line");
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}
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return make_shared<StatementBlock>(statements);
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}
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shared_ptr<Statement> Parser::matchStatementAssignment() {
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if (!tryMatchingTokenKinds({TokenKind::IDENTIFIER, TokenKind::LEFT_ARROW}, true, false))
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return nullptr;
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shared_ptr<Token> identifierToken = tokens.at(currentIndex++);
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currentIndex++; // arrow
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shared_ptr<Expression> expression = nextExpression();
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if (expression == nullptr || !expression->isValid())
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return matchStatementInvalid("Expected expression");
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return make_shared<StatementAssignment>(identifierToken->getLexme(), expression);
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}
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shared_ptr<Statement> Parser::matchStatementReturn() {
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if (!tryMatchingTokenKinds({TokenKind::RETURN}, true, true))
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return nullptr;
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shared_ptr<Expression> expression = nextExpression();
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if (expression != nullptr && !expression->isValid())
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return matchStatementInvalid("Expected expression");
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return make_shared<StatementReturn>(expression);
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}
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shared_ptr<Statement> Parser::matchStatementRepeat() {
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if (!tryMatchingTokenKinds({TokenKind::REPEAT}, true, true))
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return nullptr;
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shared_ptr<Statement> initStatement;
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shared_ptr<Expression> preConditionExpression;
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shared_ptr<Expression> postConditionExpression;
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shared_ptr<Statement> bodyBlockStatement;
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bool isMultiLine;
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// initial
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initStatement = matchStatementVariable() ?: matchStatementAssignment();
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if (initStatement != nullptr && !initStatement->isValid())
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initStatement = nullptr;
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if (!tryMatchingTokenKinds({TokenKind::COLON}, false, true)) {
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// got initial, expect comma
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if (initStatement != nullptr && !tryMatchingTokenKinds({TokenKind::COMMA}, true, true))
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return matchStatementInvalid("Expected comma after initial statement");
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// optional new line
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tryMatchingTokenKinds({TokenKind::NEW_LINE}, true, true);
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// pre condition
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preConditionExpression = nextExpression();
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if (preConditionExpression != nullptr && !preConditionExpression->isValid())
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return matchStatementInvalid("Expected pre-condition expression");
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if (!tryMatchingTokenKinds({TokenKind::COLON}, true, true)) {
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// got pre-condition, expect comma
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if (!tryMatchingTokenKinds({TokenKind::COMMA}, true, true))
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return matchStatementInvalid("Expected comma after pre-condition statement");
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// optional new line
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tryMatchingTokenKinds({TokenKind::NEW_LINE}, true, true);
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// post condition
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postConditionExpression = nextExpression();
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if (postConditionExpression == nullptr || !postConditionExpression->isValid())
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return matchStatementInvalid("Expected post-condition expression");
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// expect colon
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if (!tryMatchingTokenKinds({TokenKind::COLON}, true, true))
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return matchStatementInvalid("Expected \":\"");
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}
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}
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isMultiLine = tryMatchingTokenKinds({TokenKind::NEW_LINE}, true, true);
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// body
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if (isMultiLine)
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bodyBlockStatement = matchStatementBlock({TokenKind::SEMICOLON});
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else
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bodyBlockStatement = matchStatementBlock({TokenKind::NEW_LINE});
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if (bodyBlockStatement == nullptr || !bodyBlockStatement->isValid())
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return bodyBlockStatement ?: matchStatementInvalid("Expected block statement");
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tryMatchingTokenKinds({TokenKind::SEMICOLON}, false, true);
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return make_shared<StatementRepeat>(initStatement, preConditionExpression, postConditionExpression, dynamic_pointer_cast<StatementBlock>(bodyBlockStatement));
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}
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shared_ptr<Statement> Parser::matchStatementExpression() {
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shared_ptr<Expression> expression = nextExpression();
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if (expression == nullptr)
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return nullptr;
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else if (!expression->isValid())
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return make_shared<StatementInvalid>(tokens.at(currentIndex), expression->toString(0));
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// Consume new line
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tryMatchingTokenKinds({TokenKind::NEW_LINE}, true, true);
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return make_shared<StatementExpression>(expression);
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}
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shared_ptr<StatementInvalid> Parser::matchStatementInvalid(string message) {
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return make_shared<StatementInvalid>(tokens.at(currentIndex), message);
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}
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//
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// Expression
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//
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shared_ptr<Expression> Parser::nextExpression() {
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shared_ptr<Expression> expression;
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expression = matchEquality();
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if (expression != nullptr)
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return expression;
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expression = matchExpressionIfElse();
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if (expression != nullptr)
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return expression;
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expression = matchExpressionVariable();
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if (expression != nullptr)
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return expression;
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return nullptr;
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}
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shared_ptr<Expression> Parser::matchEquality() {
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shared_ptr<Expression> expression = matchComparison();
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if (expression == nullptr || !expression->isValid())
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return expression;
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while (tryMatchingTokenKinds({Token::tokensEquality}, false, false))
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expression = matchExpressionBinary(expression);
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return expression;
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}
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shared_ptr<Expression> Parser::matchComparison() {
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shared_ptr<Expression> expression = matchTerm();
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if (expression == nullptr || !expression->isValid())
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return expression;
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while (tryMatchingTokenKinds({Token::tokensComparison}, false, false))
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expression = matchExpressionBinary(expression);
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return expression;
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}
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shared_ptr<Expression> Parser::matchTerm() {
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shared_ptr<Expression> expression = matchFactor();
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if (expression == nullptr || !expression->isValid())
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return expression;
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while (tryMatchingTokenKinds({Token::tokensTerm}, false, false))
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expression = matchExpressionBinary(expression);
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return expression;
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}
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shared_ptr<Expression> Parser::matchFactor() {
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shared_ptr<Expression> expression = matchPrimary();
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if (expression == nullptr || !expression->isValid())
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return expression;
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while (tokens.at(currentIndex)->isOfKind(Token::tokensFactor))
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expression = matchExpressionBinary(expression);
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return expression;
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}
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shared_ptr<Expression> Parser::matchPrimary() {
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shared_ptr<Expression> expression;
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expression = matchExpressionGrouping();
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if (expression != nullptr)
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return expression;
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expression = matchExpressionLiteral();
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if (expression != nullptr)
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return expression;
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expression = matchExpressionCall();
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if (expression != nullptr)
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return expression;
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expression = matchExpressionVariable();
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if (expression != nullptr)
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return expression;
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return nullptr;
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}
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shared_ptr<Expression> Parser::matchExpressionGrouping() {
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shared_ptr<Token> token = tokens.at(currentIndex);
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if (tryMatchingTokenKinds({TokenKind::LEFT_PAREN}, true, true)) {
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shared_ptr<Expression> expression = matchTerm();
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// has grouped expression failed?
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if (expression == nullptr || !expression->isValid()) {
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return expression ?: matchExpressionInvalid("Expected expression");
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} else if (tryMatchingTokenKinds({TokenKind::RIGHT_PAREN}, true, true)) {
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return make_shared<ExpressionGrouping>(expression);
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} else {
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return matchExpressionInvalid("Unexpected token");
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}
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}
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return nullptr;
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}
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shared_ptr<Expression> Parser::matchExpressionLiteral() {
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shared_ptr<Token> token = tokens.at(currentIndex);
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if (tryMatchingTokenKinds(Token::tokensLiteral, false, true))
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return make_shared<ExpressionLiteral>(token);
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return nullptr;
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}
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shared_ptr<Expression> Parser::matchExpressionVariable() {
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shared_ptr<Token> token = tokens.at(currentIndex);
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if (tryMatchingTokenKinds({TokenKind::IDENTIFIER}, true, true))
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return make_shared<ExpressionVariable>(token->getLexme());
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return nullptr;
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}
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shared_ptr<Expression> Parser::matchExpressionCall() {
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if (!tryMatchingTokenKinds({TokenKind::IDENTIFIER, TokenKind::LEFT_PAREN}, true, false))
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return nullptr;
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shared_ptr<Token> identifierToken = tokens.at(currentIndex);
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currentIndex++; // identifier
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currentIndex++; // left parenthesis
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vector<shared_ptr<Expression>> argumentExpressions;
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do {
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tryMatchingTokenKinds({TokenKind::NEW_LINE}, true, true); // optional new line
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shared_ptr<Expression> argumentExpression = nextExpression();
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if (argumentExpression == nullptr || !argumentExpression->isValid())
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return argumentExpression;
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argumentExpressions.push_back(argumentExpression);
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} while (tryMatchingTokenKinds({TokenKind::COMMA}, true, true));
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tryMatchingTokenKinds({TokenKind::NEW_LINE}, true, true); // optional new line
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if (!tryMatchingTokenKinds({TokenKind::RIGHT_PAREN}, true, true))
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return matchExpressionInvalid("Expected \")\"");
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return make_shared<ExpressionCall>(identifierToken->getLexme(), argumentExpressions);
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}
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shared_ptr<Expression> Parser::matchExpressionIfElse() {
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if (!tryMatchingTokenKinds({TokenKind::IF}, true, true))
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return nullptr;
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shared_ptr<Expression> condition;
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shared_ptr<Expression> thenBlock;
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shared_ptr<Expression> elseBlock;
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// condition expression
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condition = nextExpression();
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if (condition == nullptr || !condition->isValid())
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return condition ?: matchExpressionInvalid("Expected condition expression");
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if (!tryMatchingTokenKinds({TokenKind::COLON}, true, true))
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return matchExpressionInvalid("Expected \":\"");
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// then
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bool isMultiLine = false;
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if (tryMatchingTokenKinds({TokenKind::NEW_LINE}, true, true))
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isMultiLine = true;
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// then block
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if (isMultiLine)
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thenBlock = matchExpressionBlock({TokenKind::ELSE, TokenKind::SEMICOLON});
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else
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thenBlock = matchExpressionBlock({TokenKind::ELSE, TokenKind::NEW_LINE});
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if (thenBlock == nullptr || !thenBlock->isValid())
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return thenBlock ?: matchExpressionInvalid("Expected then block");
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// else
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if (tryMatchingTokenKinds({TokenKind::ELSE}, true, true)) {
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if (tryMatchingTokenKinds({TokenKind::NEW_LINE}, true, true))
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isMultiLine = true;
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// else block
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if (isMultiLine)
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elseBlock = matchExpressionBlock({TokenKind::SEMICOLON});
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else
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elseBlock = matchExpressionBlock({TokenKind::NEW_LINE});
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if (elseBlock == nullptr || !elseBlock->isValid())
|
|
return elseBlock ?: matchExpressionInvalid("Expected else block");
|
|
}
|
|
tryMatchingTokenKinds({TokenKind::SEMICOLON}, false, true);
|
|
|
|
return make_shared<ExpressionIfElse>(condition, dynamic_pointer_cast<ExpressionBlock>(thenBlock), dynamic_pointer_cast<ExpressionBlock>(elseBlock));
|
|
}
|
|
|
|
shared_ptr<Expression> Parser::matchExpressionBinary(shared_ptr<Expression> left) {
|
|
shared_ptr<Token> token = tokens.at(currentIndex);
|
|
shared_ptr<Expression> right;
|
|
// What level of binary expression are we having?
|
|
if (tryMatchingTokenKinds(Token::tokensEquality, false, true)) {
|
|
right = matchComparison();
|
|
} else if (tryMatchingTokenKinds(Token::tokensComparison, false, true)) {
|
|
right = matchTerm();
|
|
} else if (tryMatchingTokenKinds(Token::tokensTerm, false, true)) {
|
|
right = matchFactor();
|
|
} else if (tryMatchingTokenKinds(Token::tokensFactor, false, true)) {
|
|
right = matchPrimary();
|
|
}
|
|
|
|
if (right == nullptr) {
|
|
return matchExpressionInvalid("Expected right-side expression");
|
|
} else if (!right->isValid()) {
|
|
return right;
|
|
} else {
|
|
return make_shared<ExpressionBinary>(token, left, right);
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
shared_ptr<Expression> Parser::matchExpressionBlock(vector<TokenKind> terminalTokenKinds) {
|
|
vector<shared_ptr<Statement>> statements;
|
|
|
|
while (!tryMatchingTokenKinds(terminalTokenKinds, false, false)) {
|
|
shared_ptr<Statement> statement = nextInBlockStatement();
|
|
if (statement == nullptr || !statement->isValid())
|
|
return matchExpressionInvalid("Expected statement");
|
|
statements.push_back(statement);
|
|
}
|
|
|
|
return make_shared<ExpressionBlock>(statements);
|
|
}
|
|
|
|
shared_ptr<ExpressionInvalid> Parser::matchExpressionInvalid(string message) {
|
|
return make_shared<ExpressionInvalid>(tokens.at(currentIndex));
|
|
}
|
|
|
|
bool Parser::tryMatchingTokenKinds(vector<TokenKind> kinds, bool shouldMatchAll, bool shouldAdvance) {
|
|
int requiredCount = shouldMatchAll ? kinds.size() : 1;
|
|
if (currentIndex + requiredCount > tokens.size())
|
|
return false;
|
|
|
|
if (shouldMatchAll) {
|
|
for (int i=0; i<kinds.size(); i++) {
|
|
if (kinds.at(i) != tokens.at(currentIndex + i)->getKind())
|
|
return false;
|
|
}
|
|
|
|
if (shouldAdvance)
|
|
currentIndex += kinds.size();
|
|
|
|
return true;
|
|
} else {
|
|
for (int i=0; i<kinds.size(); i++) {
|
|
if (kinds.at(i) == tokens.at(currentIndex)->getKind()) {
|
|
if (shouldAdvance)
|
|
currentIndex++;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
}
|
|
|
|
optional<ValueType> Parser::valueTypeForToken(shared_ptr<Token> token) {
|
|
if (token->getKind() != TokenKind::TYPE)
|
|
return {};
|
|
|
|
if (token->getLexme().compare("bool") == 0)
|
|
return ValueType::BOOL;
|
|
else if (token->getLexme().compare("sint32") == 0)
|
|
return ValueType::SINT32;
|
|
else if (token->getLexme().compare("real32") == 0)
|
|
return ValueType::REAL32;
|
|
|
|
return {};
|
|
}
|