blob: 5c427eec4aacb64955b9cdf748de2f6fae1edda1 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
#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 = 65536;
/** @class Tokenizor
* Break down the input string stream into tokens
*/
class Tokenizor {
private:
FILE *stream;
char *buff_ptr;
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
* Cons)
*/
class ASTGenerator {
private:
static EvalObj* to_float(const string &);
static EvalObj* to_int(const string &);
/** 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
*/
Cons *absorb(Tokenizor *tk);
};
#endif
|