87 lines
2.2 KiB
C++
87 lines
2.2 KiB
C++
#ifndef PARSER_H
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#define PARSER_H
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#include <string>
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#include <vector>
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#include <cstdlib>
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#include "Token.h"
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#include "ContextManager.h"
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#include "AST/AllTypesOfASTNodes.h"
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#include "AST/AST.h"
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using namespace std;
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/**
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* Parser does parsing and produces AST. It provides root of AST which can be used to execute statements.
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*/
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class Parser
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{
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public:
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/**
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* Parser is initialized with pointer or reference to ContextManager,
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* which is then used to manage contexts in AST created by Parser.
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*/
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Parser(ContextManager * context_manager);
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ContextManager * context_manager;
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virtual ~Parser();
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/**
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* interpret() is essential method in Parser. If given tokens, Parser prepares
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* AST and returns ProgramNode (root node).
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*/
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ProgramNode * interpret();
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string error_message;
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void add_tokens(vector<Token> tokens);
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/**
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* show_token() shows token which Parser stores and uses for creating an AST.
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* It's useful during debugging.
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*/
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string show_tokens();
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AST tree;
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ProgramNode * program;
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/**
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* resets all info, best to use, when one wants to parse whole new tree
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*/
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void erase_all();
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protected:
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private:
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Token current_token;
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string tok_value;
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vector<Token> token_stream;
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unsigned int position_in_stream;
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bool in_statement;
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bool read_next();
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bool peek(string s);
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bool peek_one_ahead(string s);
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bool accept(string s);
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bool expect(string s);
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bool is_type();
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void error(string s);
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/**
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* statement() is function used for parsing statements,
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* it is used as a first in sequence of recurrent calls.
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*/
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ASTStatement * statement();
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ASTExpression * expr();
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ASTExpression * log_expr();
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ASTExpression * eq_expr();
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ASTExpression * rel_expr();
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ASTExpression * add_expr();
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ASTExpression * mul_expr();
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ASTExpression * unary_expr();
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ASTExpression * postfix_expr();
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ASTExpression * prim_expr();
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};
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#endif // PARSER_H
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