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#ifndef PARSER_H
#define PARSER_H
#include "model.h"
#include <string>
using std::string;
const int TOKEN_BUFF_SIZE = 65536;
const int PARSE_STACK_SIZE = 262144;
/** @class Tokenizor
* Break down the input string stream into tokens
*/
class Tokenizor {
private:
FILE *stream;
char *buff_ptr;
bool escaping;
public:
Tokenizor();
/** Set the stream to be read from (without setting this, the default
* would be stdin) */
void set_stream(FILE *stream);
/** Extract the next token
* @param ret the extracted token
* @return false if nothing can be read further
* */
bool get_token(string &ret);
};
/** @class ASTGenerator
* Read the tokens and build up an Abstract Syntax Tree (which is in effect a
* Pair)
*/
class ASTGenerator {
private:
/** Convert the string to an internal object */
static EvalObj* to_obj(const string &);
public:
ASTGenerator();
/** Read tokens from Tokenizor tk, then return a AST
* @param tk pointer to a Tokenizor
* @return Abstract Syntax Tree
*/
Pair *absorb(Tokenizor *tk);
};
#endif
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