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-rw-r--r--src/formula.h62
1 files changed, 62 insertions, 0 deletions
diff --git a/src/formula.h b/src/formula.h
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1#ifndef FORMULA_H
2#define FORMULA_H
3
4#include <stdint.h>
5
6#include <stack>
7#include "sbuffer.h"
8
9#include "exceptionbase.h"
10
11subExceptionDecl( ParseException );
12
13/**
14 *
15 */
16class Formula
17{
18public:
19 Formula();
20 virtual ~Formula();
21
22 double run( const char *sFormula );
23
24private:
25 enum
26 {
27 symEOS,
28 symAdd,
29 symSubtract,
30 symMultiply,
31 symDivide,
32 symOpenParen,
33 symCloseParen,
34 symNumber,
35 symVariable
36 };
37
38 typedef struct Token
39 {
40 Token() {}
41 Token( uint8_t nSym ) : nSym( nSym ) { }
42 Token( uint8_t nSym, double dNum ) : nSym( nSym ) { val.num = dNum; }
43 uint8_t nSym;
44 union
45 {
46 double num;
47 } val;
48 } Token;
49
50 std::stack<Token> sToken;
51 Token tLook;
52 int nState;
53 SBuffer sBuf;
54
55private:
56 void push();
57 void state();
58 Token nextToken();
59 void printToken( Token &tok );
60};
61
62#endif