Parser.hpp

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#pragma once
 
#include "../internal/ConfigNode.hpp"
#include "Lexer.hpp"
 
/* GRAMMAR in EBNF
 *  config_file = { server_block } ;
 *  server_block = "server" "{" { statement } "}" ;
 *  statement = directive | location_block ;
 *  directive = IDENTIFIER { parameter } ";" ;
 *  location_block = "location" IDENTIFIER "{" { directive } "}" ;
 *  parameter = IDENTIFIER | STRING | NUMBER ;
 */
 
namespace config {

class Parser {
public:
    static std::vector<ConfigNode> parse(TokenArray const &);
 
private:
    std::vector<ConfigNode> nodes_;
    TokenArray const &tokens_;
    size_t pos_;
 
    Parser();
    explicit Parser(TokenArray const &);
    size_t size() const;
 
    Token const &currentToken() const;
    Token const &peekToken() const;
    void consumeToken();
    void expectToken(TokenType type);
    void expectToken(std::string const &literal);
    bool isTokenAValue() const;
    void displayCurrentToken() const;
    static void addDirective(ConfigNode &node, ParsedDirectivePair const &pair);
    void pushTokenTo(ParsedDirectiveArgs &args) const;
 
    void handleServerBlock();
    void handleStatement();
    void handleLocationBlock();
    ParsedDirectivePair handleDirective();
};
 
} // namespace config