1005 lines
26 KiB
C++
1005 lines
26 KiB
C++
#include "ast/call_expression_ast.h"
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#include "ast/number_expression_ast.h"
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#include "ast/variable_expression_ast.h"
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#include "parser.h"
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#include <memory>
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#include <stack>
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#include <string>
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#include <vector>
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std::shared_ptr<obelisk::Lexer> obelisk::Parser::getLexer()
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{
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return lexer_;
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}
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void obelisk::Parser::setLexer(std::shared_ptr<obelisk::Lexer> lexer)
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{
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lexer_ = lexer;
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currentToken_ = 0;
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}
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int obelisk::Parser::getNextToken()
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{
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try
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{
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setCurrentToken(getLexer()->getToken());
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}
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catch (obelisk::LexerException& exception)
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{
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throw;
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}
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return getCurrentToken();
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}
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int obelisk::Parser::getCurrentToken()
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{
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return currentToken_;
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}
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void obelisk::Parser::setCurrentToken(int currentToken)
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{
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currentToken_ = currentToken;
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}
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std::unique_ptr<obelisk::ExpressionAST> obelisk::Parser::logError(
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const char* str)
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{
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fprintf(stderr, "Error: %s\n", str);
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return nullptr;
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}
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std::unique_ptr<obelisk::PrototypeAST> obelisk::Parser::logErrorPrototype(
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const char* str)
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{
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logError(str);
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return nullptr;
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}
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std::unique_ptr<obelisk::ExpressionAST> obelisk::Parser::parseExpression()
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{
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auto LHS = parsePrimary();
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if (!LHS)
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{
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return nullptr;
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}
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return LHS;
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}
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std::unique_ptr<obelisk::ExpressionAST> obelisk::Parser::parsePrimary()
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{
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switch (getCurrentToken())
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{
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case obelisk::Lexer::kTokenIdentifier :
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return parseIdentifierExpression();
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case obelisk::Lexer::kTokenNumber :
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return parseNumberExpression();
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case '(' :
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return parseParenthesisExpression();
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default :
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return logError("unknown token when expecting and expression");
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}
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}
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std::unique_ptr<obelisk::ExpressionAST> obelisk::Parser::parseNumberExpression()
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{
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auto result = std::make_unique<obelisk::NumberExpressionAST>(
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getLexer()->getNumberValue());
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getNextToken();
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return result;
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}
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std::unique_ptr<obelisk::ExpressionAST>
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obelisk::Parser::parseParenthesisExpression()
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{
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getNextToken();
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auto v = parseExpression();
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if (!v)
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{
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return nullptr;
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}
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if (getCurrentToken() != ')')
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{
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return logError("expected ')'");
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}
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getNextToken();
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return v;
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}
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std::unique_ptr<obelisk::ExpressionAST>
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obelisk::Parser::parseIdentifierExpression()
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{
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std::string idName = getLexer()->getIdentifier();
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getNextToken();
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if (getCurrentToken() != '(')
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{
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return std::make_unique<obelisk::VariableExpressionAST>(idName);
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}
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getNextToken();
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std::vector<std::unique_ptr<obelisk::ExpressionAST>> args;
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if (getCurrentToken() != ')')
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{
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while (true)
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{
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if (auto arg = parseExpression())
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{
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args.push_back(std::move(arg));
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}
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else
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{
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return nullptr;
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}
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if (getCurrentToken() == ')')
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{
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break;
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}
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if (getCurrentToken() != ',')
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{
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return logError("Expected ')' or ',' in argument list");
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}
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getNextToken();
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}
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}
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getNextToken();
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return std::make_unique<CallExpressionAST>(idName, std::move(args));
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}
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std::unique_ptr<obelisk::PrototypeAST> obelisk::Parser::parsePrototype()
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{
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if (getCurrentToken() != obelisk::Lexer::kTokenIdentifier)
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{
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return logErrorPrototype("Expected function name in prototype");
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}
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std::string functionName = getLexer()->getIdentifier();
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getNextToken();
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if (getCurrentToken() != '(')
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{
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return logErrorPrototype("Expected '(' in prototype");
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}
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std::vector<std::string> argNames;
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while (getNextToken() == obelisk::Lexer::kTokenIdentifier)
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{
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argNames.push_back(getLexer()->getIdentifier());
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}
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if (getCurrentToken() != ')')
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{
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return logErrorPrototype("Expected ')' in prototype");
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}
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getNextToken();
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return std::make_unique<obelisk::PrototypeAST>(functionName,
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std::move(argNames));
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}
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std::unique_ptr<obelisk::FunctionAST> obelisk::Parser::parseDefinition()
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{
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getNextToken();
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auto prototype = parsePrototype();
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if (!prototype)
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{
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return nullptr;
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}
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if (auto expression = parseExpression())
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{
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return std::make_unique<FunctionAST>(std::move(prototype),
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std::move(expression));
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}
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return nullptr;
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}
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std::unique_ptr<obelisk::FunctionAST> obelisk::Parser::parseTopLevelExpression()
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{
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if (auto expression = parseExpression())
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{
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// Make an anonymous prototype
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auto prototype = std::make_unique<obelisk::PrototypeAST>("__anon_expr",
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std::vector<std::string>());
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return std::make_unique<obelisk::FunctionAST>(std::move(prototype),
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std::move(expression));
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}
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return nullptr;
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}
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std::unique_ptr<obelisk::PrototypeAST> obelisk::Parser::parseExtern()
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{
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getNextToken();
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return parsePrototype();
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}
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void obelisk::Parser::parseAction(obelisk::SuggestAction& suggestAction)
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{
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std::stack<char> syntax;
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getNextToken();
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if (getCurrentToken() != '(')
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{
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throw obelisk::ParserException(
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"expected '(' but got '" + std::to_string(getCurrentToken()) + "'");
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}
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syntax.push('(');
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getNextToken();
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if (getLexer()->getIdentifier() != "if")
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{
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throw obelisk::ParserException(
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"expected 'if' but got '" + getLexer()->getIdentifier() + "'");
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}
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bool getEntity {true};
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std::string leftEntity {""};
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std::string rightEntity {""};
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std::string trueAction {""};
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std::string falseAction {""};
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std::string entityName {""};
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std::string verb {""};
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getNextToken();
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// get the entity side of statement
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while (true)
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{
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if (getEntity)
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{
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if (getCurrentToken() == '"')
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{
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if (syntax.top() != '"')
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{
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// open a double quote
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syntax.push('"');
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getNextToken();
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}
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else if (syntax.top() == '"')
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{
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// close a double quote
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syntax.pop();
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if (verb == "")
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{
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leftEntity = std::move(entityName);
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}
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else
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{
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rightEntity = std::move(entityName);
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}
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getEntity = false;
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getNextToken();
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continue;
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}
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}
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if (syntax.top() == '"')
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{
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if (entityName != "")
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{
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entityName += " ";
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}
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entityName += getLexer()->getIdentifier();
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}
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getNextToken();
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}
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else
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{
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if (getCurrentToken() == ')')
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{
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throw obelisk::ParserException("unexpected ')'");
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}
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if (getCurrentToken() == '"')
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{
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throw obelisk::ParserException("unexpected '\"'");
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}
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if (getLexer()->getIdentifier() == "then")
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{
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break;
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}
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else
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{
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verb = getLexer()->getIdentifier();
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for (const auto& letter : verb)
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{
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if (!isalpha(letter))
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{
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throw new obelisk::ParserException(
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"non alphabetic symbol in verb");
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}
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}
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getEntity = true;
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continue;
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}
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}
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}
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// get the action side of statement
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bool getAction {true};
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while (true)
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{
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if (getAction)
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{
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if (getCurrentToken() == '"')
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{
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if (syntax.top() != '"')
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{
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// open a double quote
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syntax.push('"');
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getNextToken();
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}
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else if (syntax.top() == '"')
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{
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// close a double quote
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syntax.pop();
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if (trueAction == "")
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{
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trueAction = std::move(entityName);
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}
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else
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{
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falseAction = std::move(entityName);
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}
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getAction = false;
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getNextToken();
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continue;
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}
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}
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if (syntax.top() == '"')
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{
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if (entityName != "")
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{
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entityName += " ";
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}
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entityName += getLexer()->getIdentifier();
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}
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getNextToken();
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}
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else
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{
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if (getCurrentToken() == ')')
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{
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// closing parenthesis found, make sure we have everything
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// needed
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if (syntax.top() != '(')
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{
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throw obelisk::ParserException("unexpected ')'");
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}
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else
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{
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syntax.pop();
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}
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if (leftEntity == "")
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{
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throw obelisk::ParserException("missing left entity");
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}
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if (rightEntity == "")
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{
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throw obelisk::ParserException("missing left entity");
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}
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if (verb == "")
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{
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throw obelisk::ParserException("missing verb");
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}
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if (trueAction == "")
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{
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throw obelisk::ParserException("missing true action");
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}
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if (falseAction == "")
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{
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throw obelisk::ParserException("missing false action");
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}
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getNextToken();
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if (getCurrentToken() != ';')
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{
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throw obelisk::ParserException("missing ';'");
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}
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break;
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}
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if (getCurrentToken() == '"')
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{
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throw obelisk::ParserException("unexpected '\"'");
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break;
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}
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if (getLexer()->getIdentifier() == "else")
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{
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getNextToken();
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getAction = true;
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continue;
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}
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else
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{
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getAction = true;
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continue;
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}
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}
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}
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suggestAction.setFact(obelisk::Fact(obelisk::Entity(leftEntity),
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obelisk::Entity(rightEntity),
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obelisk::Verb(verb)));
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suggestAction.setTrueAction(obelisk::Action(trueAction));
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suggestAction.setFalseAction(obelisk::Action(falseAction));
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}
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void obelisk::Parser::parseRule(obelisk::Rule& rule)
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{
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std::stack<char> syntax;
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getNextToken();
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if (getCurrentToken() != '(')
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{
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throw obelisk::ParserException(
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"expected '(' but got '" + std::to_string(getCurrentToken()) + "'");
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}
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syntax.push('(');
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bool getEntity {true};
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bool getReason {false};
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std::string leftEntity {""};
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std::string rightEntity {""};
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std::string verb {""};
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std::string leftReasonEntity {""};
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std::string rightReasonEntity {""};
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std::string reasonVerb {""};
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std::string entityName {""};
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getNextToken();
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// get the entity side of statement
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while (true)
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{
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if (getEntity)
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{
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if (getCurrentToken() == '"')
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{
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if (syntax.top() != '"')
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{
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// open a double quote
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syntax.push('"');
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getNextToken();
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}
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else if (syntax.top() == '"')
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{
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// close a double quote
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syntax.pop();
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if (!getReason)
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{
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if (verb == "")
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{
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leftEntity = std::move(entityName);
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}
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else
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{
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rightEntity = std::move(entityName);
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}
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}
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else
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{
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if (reasonVerb == "")
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{
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leftReasonEntity = std::move(entityName);
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}
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else
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{
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rightReasonEntity = std::move(entityName);
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}
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}
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getEntity = false;
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getNextToken();
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continue;
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}
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}
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if (syntax.top() == '"')
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{
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if (entityName != "")
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{
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entityName += " ";
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}
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entityName += getLexer()->getIdentifier();
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}
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getNextToken();
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}
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else
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{
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if (getCurrentToken() == ')')
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{
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// closing parenthesis found, make sure we have everything
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// needed
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if (syntax.top() != '(')
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{
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throw obelisk::ParserException("unexpected ')'");
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}
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else
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{
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syntax.pop();
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}
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if (leftEntity == "")
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{
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throw obelisk::ParserException("missing left entity");
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}
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if (rightEntity == "")
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{
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throw obelisk::ParserException("missing left entity");
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}
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if (verb == "")
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{
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throw obelisk::ParserException("missing verb");
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}
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if (leftReasonEntity == "")
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{
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throw obelisk::ParserException(
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"missing left reason entity");
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}
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if (rightReasonEntity == "")
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{
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throw obelisk::ParserException(
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"missing right reason entity");
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}
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if (reasonVerb == "")
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{
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throw obelisk::ParserException("missing reason verb");
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}
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getNextToken();
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if (getCurrentToken() != ';')
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{
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throw obelisk::ParserException("missing ';'");
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}
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break;
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}
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if (getCurrentToken() == '"')
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{
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throw obelisk::ParserException("unexpected '\"'");
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}
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if (getLexer()->getIdentifier() == "if")
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{
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getReason = true;
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getEntity = true;
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getNextToken();
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continue;
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}
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else
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{
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if (!getReason)
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{
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verb = getLexer()->getIdentifier();
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for (const auto& letter : verb)
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{
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if (!isalpha(letter))
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{
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throw new obelisk::ParserException(
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"non alphabetic symbol in verb");
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}
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}
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getEntity = true;
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continue;
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}
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else
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{
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reasonVerb = getLexer()->getIdentifier();
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for (const auto& letter : reasonVerb)
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{
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if (!isalpha(letter))
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{
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throw new obelisk::ParserException(
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"non alphabetic symbol in verb");
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}
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}
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getEntity = true;
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continue;
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}
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}
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}
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}
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rule.setFact(obelisk::Fact(obelisk::Entity(leftEntity),
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obelisk::Entity(rightEntity),
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obelisk::Verb(verb)));
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rule.setReason(obelisk::Fact(obelisk::Entity(leftReasonEntity),
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obelisk::Entity(rightReasonEntity),
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obelisk::Verb(reasonVerb)));
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}
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void obelisk::Parser::parseFact(std::vector<obelisk::Fact>& facts)
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{
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std::stack<char> syntax;
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getNextToken();
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if (getCurrentToken() != '(')
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{
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throw obelisk::ParserException(
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"expected '(' but got '" + std::to_string(getCurrentToken()) + "'");
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}
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syntax.push('(');
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bool getEntity {true};
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std::vector<std::string> leftEntities;
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std::vector<std::string> rightEntities;
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std::string entityName {""};
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std::string verb {""};
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getNextToken();
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while (true)
|
|
{
|
|
if (getEntity)
|
|
{
|
|
if (getCurrentToken() == '"')
|
|
{
|
|
if (syntax.top() != '"')
|
|
{
|
|
// open a double quote
|
|
syntax.push('"');
|
|
getNextToken();
|
|
}
|
|
else if (syntax.top() == '"')
|
|
{
|
|
// close a double quote
|
|
syntax.pop();
|
|
if (verb == "")
|
|
{
|
|
leftEntities.push_back(entityName);
|
|
}
|
|
else
|
|
{
|
|
rightEntities.push_back(entityName);
|
|
}
|
|
entityName = "";
|
|
getEntity = false;
|
|
getNextToken();
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (syntax.top() == '"')
|
|
{
|
|
if (entityName != "")
|
|
{
|
|
entityName += " ";
|
|
}
|
|
entityName += getLexer()->getIdentifier();
|
|
}
|
|
getNextToken();
|
|
}
|
|
else
|
|
{
|
|
if (getCurrentToken() == ')')
|
|
{
|
|
// closing parenthesis found, make sure we have everything
|
|
// needed
|
|
if (syntax.top() != '(')
|
|
{
|
|
throw obelisk::ParserException("unexpected ')'");
|
|
}
|
|
else
|
|
{
|
|
syntax.pop();
|
|
}
|
|
|
|
if (verb == "")
|
|
{
|
|
throw obelisk::ParserException("verb is empty");
|
|
}
|
|
|
|
if (leftEntities.size() == 0)
|
|
{
|
|
throw obelisk::ParserException(
|
|
"missing left side entities");
|
|
}
|
|
|
|
if (rightEntities.size() == 0)
|
|
{
|
|
throw obelisk::ParserException(
|
|
"missing right side entities");
|
|
}
|
|
|
|
getNextToken();
|
|
if (getCurrentToken() != ';')
|
|
{
|
|
throw obelisk::ParserException("missing ';'");
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
if (getCurrentToken() == '"')
|
|
{
|
|
throw obelisk::ParserException("unexpected '\"'");
|
|
}
|
|
|
|
if (getLexer()->getIdentifier() == "and")
|
|
{
|
|
getNextToken();
|
|
getEntity = true;
|
|
continue;
|
|
}
|
|
else
|
|
{
|
|
verb = getLexer()->getIdentifier();
|
|
for (const auto& letter : verb)
|
|
{
|
|
if (!isalpha(letter))
|
|
{
|
|
throw new obelisk::ParserException(
|
|
"non alphabetic symbol in verb");
|
|
}
|
|
}
|
|
getEntity = true;
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
for (auto& leftEntity : leftEntities)
|
|
{
|
|
for (auto& rightEntity : rightEntities)
|
|
{
|
|
facts.push_back(obelisk::Fact(obelisk::Entity(leftEntity),
|
|
obelisk::Entity(rightEntity),
|
|
obelisk::Verb(verb),
|
|
true));
|
|
}
|
|
}
|
|
}
|
|
|
|
void obelisk::Parser::handleAction(std::unique_ptr<obelisk::KnowledgeBase>& kb)
|
|
{
|
|
obelisk::SuggestAction suggestAction;
|
|
|
|
try
|
|
{
|
|
parseAction(suggestAction);
|
|
insertEntity(kb, suggestAction.getFact().getLeftEntity());
|
|
insertEntity(kb, suggestAction.getFact().getRightEntity());
|
|
insertVerb(kb, suggestAction.getFact().getVerb());
|
|
insertFact(kb, suggestAction.getFact());
|
|
insertAction(kb, suggestAction.getTrueAction());
|
|
insertAction(kb, suggestAction.getFalseAction());
|
|
insertSuggestAction(kb, suggestAction);
|
|
}
|
|
catch (obelisk::ParserException& exception)
|
|
{
|
|
throw;
|
|
}
|
|
}
|
|
|
|
void obelisk::Parser::handleRule(std::unique_ptr<obelisk::KnowledgeBase>& kb)
|
|
{
|
|
obelisk::Rule rule;
|
|
|
|
try
|
|
{
|
|
parseRule(rule);
|
|
|
|
insertEntity(kb, rule.getReason().getLeftEntity());
|
|
insertEntity(kb, rule.getReason().getRightEntity());
|
|
insertVerb(kb, rule.getReason().getVerb());
|
|
insertFact(kb, rule.getReason());
|
|
|
|
// The rule is true, so the fact must be true to.
|
|
if (rule.getReason().getIsTrue() > 0)
|
|
{
|
|
rule.getFact().setIsTrue(1.0);
|
|
}
|
|
|
|
insertEntity(kb, rule.getFact().getLeftEntity());
|
|
insertEntity(kb, rule.getFact().getRightEntity());
|
|
insertVerb(kb, rule.getFact().getVerb());
|
|
insertFact(kb, rule.getFact());
|
|
|
|
insertRule(kb, rule);
|
|
}
|
|
catch (obelisk::ParserException& exception)
|
|
{
|
|
throw;
|
|
}
|
|
}
|
|
|
|
void obelisk::Parser::handleFact(std::unique_ptr<obelisk::KnowledgeBase>& kb)
|
|
{
|
|
std::vector<obelisk::Fact> facts;
|
|
try
|
|
{
|
|
parseFact(facts);
|
|
}
|
|
catch (obelisk::ParserException& exception)
|
|
{
|
|
throw;
|
|
}
|
|
|
|
int verbId = 0;
|
|
for (auto& fact : facts)
|
|
{
|
|
try
|
|
{
|
|
insertEntity(kb, fact.getLeftEntity());
|
|
insertEntity(kb, fact.getRightEntity());
|
|
}
|
|
catch (obelisk::ParserException& exception)
|
|
{
|
|
throw;
|
|
}
|
|
|
|
if (verbId == 0)
|
|
{
|
|
try
|
|
{
|
|
insertVerb(kb, fact.getVerb());
|
|
}
|
|
catch (obelisk::ParserException& exception)
|
|
{
|
|
throw;
|
|
}
|
|
verbId = fact.getVerb().getId();
|
|
}
|
|
else
|
|
{
|
|
fact.getVerb().setId(verbId);
|
|
}
|
|
|
|
try
|
|
{
|
|
insertFact(kb, fact, true);
|
|
}
|
|
catch (obelisk::ParserException& exception)
|
|
{
|
|
throw;
|
|
}
|
|
|
|
kb->checkRule(fact);
|
|
}
|
|
}
|
|
|
|
void obelisk::Parser::insertEntity(std::unique_ptr<obelisk::KnowledgeBase>& kb,
|
|
obelisk::Entity& entity)
|
|
{
|
|
std::vector<obelisk::Entity> entities {entity};
|
|
kb->addEntities(entities);
|
|
entity = std::move(entities.front());
|
|
|
|
// the id was not inserted, so check if it exists in the database
|
|
if (entity.getId() == 0)
|
|
{
|
|
kb->getEntity(entity);
|
|
if (entity.getId() == 0)
|
|
{
|
|
throw obelisk::ParserException(
|
|
"entity could not be inserted into the database");
|
|
}
|
|
}
|
|
}
|
|
|
|
void obelisk::Parser::insertVerb(std::unique_ptr<obelisk::KnowledgeBase>& kb,
|
|
obelisk::Verb& verb)
|
|
{
|
|
std::vector<obelisk::Verb> verbs {verb};
|
|
kb->addVerbs(verbs);
|
|
verb = std::move(verbs.front());
|
|
|
|
// the id was not inserted, so check if it exists in the database
|
|
if (verb.getId() == 0)
|
|
{
|
|
kb->getVerb(verb);
|
|
if (verb.getId() == 0)
|
|
{
|
|
throw obelisk::ParserException(
|
|
"verb could not be inserted into the database");
|
|
}
|
|
}
|
|
}
|
|
|
|
void obelisk::Parser::insertAction(std::unique_ptr<obelisk::KnowledgeBase>& kb,
|
|
obelisk::Action& action)
|
|
{
|
|
std::vector<obelisk::Action> actions {action};
|
|
kb->addActions(actions);
|
|
action = std::move(actions.front());
|
|
|
|
// the id was not inserted, so check if it exists in the database
|
|
if (action.getId() == 0)
|
|
{
|
|
kb->getAction(action);
|
|
if (action.getId() == 0)
|
|
{
|
|
throw obelisk::ParserException(
|
|
"action could not be inserted into the database");
|
|
}
|
|
}
|
|
}
|
|
|
|
void obelisk::Parser::insertFact(std::unique_ptr<obelisk::KnowledgeBase>& kb,
|
|
obelisk::Fact& fact,
|
|
bool updateIsTrue)
|
|
{
|
|
std::vector<obelisk::Fact> facts {fact};
|
|
kb->addFacts(facts);
|
|
fact = std::move(facts.front());
|
|
|
|
// the id was not inserted, so check if it exists in the database
|
|
if (fact.getId() == 0)
|
|
{
|
|
kb->getFact(fact);
|
|
if (fact.getId() == 0)
|
|
{
|
|
throw obelisk::ParserException(
|
|
"fact could not be inserted into the database");
|
|
}
|
|
else
|
|
{
|
|
if (updateIsTrue)
|
|
{
|
|
fact.setIsTrue(1.0);
|
|
kb->updateIsTrue(fact);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void obelisk::Parser::insertSuggestAction(
|
|
std::unique_ptr<obelisk::KnowledgeBase>& kb,
|
|
obelisk::SuggestAction& suggestAction)
|
|
{
|
|
std::vector<obelisk::SuggestAction> suggestActions {suggestAction};
|
|
kb->addSuggestActions(suggestActions);
|
|
suggestAction = std::move(suggestActions.front());
|
|
|
|
// the id was not inserted, so check if it exists in the database
|
|
if (suggestAction.getId() == 0)
|
|
{
|
|
kb->getSuggestAction(suggestAction);
|
|
if (suggestAction.getId() == 0)
|
|
{
|
|
throw obelisk::ParserException(
|
|
"suggest_action could not be inserted into the database");
|
|
}
|
|
}
|
|
}
|
|
|
|
void obelisk::Parser::insertRule(std::unique_ptr<obelisk::KnowledgeBase>& kb,
|
|
obelisk::Rule& rule)
|
|
{
|
|
std::vector<obelisk::Rule> rules {rule};
|
|
kb->addRules(rules);
|
|
rule = std::move(rules.front());
|
|
|
|
// the id was not inserted, so check if it exists in the database
|
|
if (rule.getId() == 0)
|
|
{
|
|
kb->getRule(rule);
|
|
if (rule.getId() == 0)
|
|
{
|
|
throw obelisk::ParserException(
|
|
"rule could not be inserted into the database");
|
|
}
|
|
}
|
|
}
|