0e80ee7778
The use of array tuples, requires an explicit include of the array library Change-Id: I06730051777a97edf80e41a5604184b387b12239 Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
128 lines
4.1 KiB
C++
128 lines
4.1 KiB
C++
/*
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* Copyright (c) 2016 ARM Limited
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* All rights reserved
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: David Guillen Fandos
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*/
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#ifndef __SIM_MATHEXPR_HH__
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#define __SIM_MATHEXPR_HH__
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#include <algorithm>
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#include <array>
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#include <functional>
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#include <string>
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class MathExpr {
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public:
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MathExpr(std::string expr);
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typedef std::function<double(std::string)> EvalCallback;
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/**
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* Prints an ASCII representation of the expression tree
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*
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* @return A string containing the ASCII representation of the expression
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*/
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std::string toStr() const { return toStr(root, ""); }
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/**
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* Evaluates the expression
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*
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* @param fn A callback funcion to evaluate variables
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*
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* @return The value for this expression
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*/
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double eval(EvalCallback fn) const { return eval(root, fn); }
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private:
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enum Operator {
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bAdd, bSub, bMul, bDiv, bPow, uNeg, sValue, sVariable, nInvalid
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};
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// Match operators
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const int MAX_PRIO = 4;
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typedef double (*binOp)(double, double);
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struct OpSearch {
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bool binary;
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Operator op;
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int priority;
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char c;
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binOp fn;
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};
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/** Operator list */
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std::array<OpSearch, uNeg + 1> ops;
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class Node {
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public:
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Node() : op(nInvalid), l(0), r(0), value(0) {}
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std::string toStr() const {
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const char opStr[] = {'+', '-', '*', '/', '^', '-'};
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switch (op) {
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case nInvalid:
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return "INVALID";
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case sVariable:
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return variable;
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case sValue:
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return std::to_string(value);
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default:
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return std::string(1, opStr[op]);
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};
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}
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Operator op;
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Node *l, *r;
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double value;
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std::string variable;
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};
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/** Root node */
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Node * root;
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/** Parse and create nodes from string */
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Node *parse(std::string expr);
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/** Print tree as string */
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std::string toStr(Node *n, std::string prefix) const;
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/** Eval a node */
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double eval(const Node *n, EvalCallback fn) const;
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};
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#endif
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