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Diffstat (limited to '')
-rw-r--r-- | src/old/formula.h | 77 |
1 files changed, 0 insertions, 77 deletions
diff --git a/src/old/formula.h b/src/old/formula.h deleted file mode 100644 index 939eb09..0000000 --- a/src/old/formula.h +++ /dev/null | |||
@@ -1,77 +0,0 @@ | |||
1 | #ifndef FORMULA_H | ||
2 | #define FORMULA_H | ||
3 | |||
4 | #include <stdint.h> | ||
5 | |||
6 | #include <math.h> | ||
7 | #include <stack> | ||
8 | #include "sbuffer.h" | ||
9 | |||
10 | #include "exceptionbase.h" | ||
11 | #include "hash.h" | ||
12 | |||
13 | subExceptionDecl( ParseException ); | ||
14 | |||
15 | /** | ||
16 | * Implements a very simple formula parser that allows use of variables and | ||
17 | * custom functions. This is based on a simple calculator-type parser that | ||
18 | * executes as it processes, accounting for operator precedence and grouping. | ||
19 | */ | ||
20 | class Formula | ||
21 | { | ||
22 | public: | ||
23 | Formula(); | ||
24 | virtual ~Formula(); | ||
25 | |||
26 | double run( char *sFormula ); | ||
27 | |||
28 | typedef Hash<std::string, double> varHash; | ||
29 | varHash hVars; | ||
30 | |||
31 | typedef struct Func | ||
32 | { | ||
33 | double operator()( double x ) | ||
34 | { | ||
35 | return 0.0; | ||
36 | } | ||
37 | } Func; | ||
38 | |||
39 | typedef Hash<std::string, Func> funcHash; | ||
40 | funcHash hFunc; | ||
41 | |||
42 | typedef struct FuncSin : Func | ||
43 | { | ||
44 | double operator()( double x ) | ||
45 | { | ||
46 | return sin( x ); | ||
47 | } | ||
48 | } FuncSin; | ||
49 | |||
50 | private: | ||
51 | enum | ||
52 | { | ||
53 | symEOS, | ||
54 | symAdd, | ||
55 | symSubtract, | ||
56 | symMultiply, | ||
57 | symDivide, | ||
58 | symOpenParen, | ||
59 | symCloseParen, | ||
60 | symNumber, | ||
61 | symVariable, | ||
62 | symExponent, | ||
63 | symModulus | ||
64 | }; | ||
65 | |||
66 | typedef uint8_t symType; | ||
67 | |||
68 | std::stack<symType> sOper; | ||
69 | std::stack<double> sValue; | ||
70 | |||
71 | private: | ||
72 | symType getPrec( symType nOper ); | ||
73 | symType nextToken( char **sBuf ); | ||
74 | void reduce( bool bCloseParen = false ); | ||
75 | }; | ||
76 | |||
77 | #endif | ||