1/*
2 * Copyright (c) 2016 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder. You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: David Guillen Fandos
38 */
39
40#ifndef __SIM_MATHEXPR_HH__
41#define __SIM_MATHEXPR_HH__
42
43#include <algorithm>
| 1/*
2 * Copyright (c) 2016 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder. You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: David Guillen Fandos
38 */
39
40#ifndef __SIM_MATHEXPR_HH__
41#define __SIM_MATHEXPR_HH__
42
43#include <algorithm>
|
44#include <string>
45
46class MathExpr {
47 public:
48
49 MathExpr(std::string expr);
50
51 typedef std::function<double(std::string)> EvalCallback;
52
53 /**
54 * Prints an ASCII representation of the expression tree
55 *
56 * @return A string containing the ASCII representation of the expression
57 */
58 std::string toStr() const { return toStr(root, ""); }
59
60 /**
61 * Evaluates the expression
62 *
63 * @param fn A callback funcion to evaluate variables
64 *
65 * @return The value for this expression
66 */
67 double eval(EvalCallback fn) const { return eval(root, fn); }
68
69 private:
70 enum Operator {
71 bAdd, bSub, bMul, bDiv, bPow, uNeg, sValue, sVariable, nInvalid
72 };
73
74 // Match operators
75 const int MAX_PRIO = 4;
76 typedef double (*binOp)(double, double);
77 struct OpSearch {
78 bool binary;
79 Operator op;
80 int priority;
81 char c;
82 binOp fn;
83 };
84
85 /** Operator list */
86 std::array<OpSearch, uNeg + 1> ops;
87
88 class Node {
89 public:
90 Node() : op(nInvalid), l(0), r(0), value(0) {}
91 std::string toStr() const {
92 const char opStr[] = {'+', '-', '*', '/', '^', '-'};
93 switch (op) {
94 case nInvalid:
95 return "INVALID";
96 case sVariable:
97 return variable;
98 case sValue:
99 return std::to_string(value);
100 default:
101 return std::string(1, opStr[op]);
102 };
103 }
104
105 Operator op;
106 Node *l, *r;
107 double value;
108 std::string variable;
109 };
110
111 /** Root node */
112 Node * root;
113
114 /** Parse and create nodes from string */
115 Node *parse(std::string expr);
116
117 /** Print tree as string */
118 std::string toStr(Node *n, std::string prefix) const;
119
120 /** Eval a node */
121 double eval(const Node *n, EvalCallback fn) const;
122};
123
124#endif
125
126
| 45#include <string>
46
47class MathExpr {
48 public:
49
50 MathExpr(std::string expr);
51
52 typedef std::function<double(std::string)> EvalCallback;
53
54 /**
55 * Prints an ASCII representation of the expression tree
56 *
57 * @return A string containing the ASCII representation of the expression
58 */
59 std::string toStr() const { return toStr(root, ""); }
60
61 /**
62 * Evaluates the expression
63 *
64 * @param fn A callback funcion to evaluate variables
65 *
66 * @return The value for this expression
67 */
68 double eval(EvalCallback fn) const { return eval(root, fn); }
69
70 private:
71 enum Operator {
72 bAdd, bSub, bMul, bDiv, bPow, uNeg, sValue, sVariable, nInvalid
73 };
74
75 // Match operators
76 const int MAX_PRIO = 4;
77 typedef double (*binOp)(double, double);
78 struct OpSearch {
79 bool binary;
80 Operator op;
81 int priority;
82 char c;
83 binOp fn;
84 };
85
86 /** Operator list */
87 std::array<OpSearch, uNeg + 1> ops;
88
89 class Node {
90 public:
91 Node() : op(nInvalid), l(0), r(0), value(0) {}
92 std::string toStr() const {
93 const char opStr[] = {'+', '-', '*', '/', '^', '-'};
94 switch (op) {
95 case nInvalid:
96 return "INVALID";
97 case sVariable:
98 return variable;
99 case sValue:
100 return std::to_string(value);
101 default:
102 return std::string(1, opStr[op]);
103 };
104 }
105
106 Operator op;
107 Node *l, *r;
108 double value;
109 std::string variable;
110 };
111
112 /** Root node */
113 Node * root;
114
115 /** Parse and create nodes from string */
116 Node *parse(std::string expr);
117
118 /** Print tree as string */
119 std::string toStr(Node *n, std::string prefix) const;
120
121 /** Eval a node */
122 double eval(const Node *n, EvalCallback fn) const;
123};
124
125#endif
126
127
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