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410 lines
14 KiB
C++
410 lines
14 KiB
C++
//---------------------------------------------------------------------------
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//
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// __________
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// _____ __ __\______ \_____ _______ ______ ____ _______
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// / \ | | \| ___/\__ \ \_ __ \/ ___/_/ __ \\_ __ |
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// | Y Y \| | /| | / __ \_| | \/\___ \ \ ___/ | | \/
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// |__|_| /|____/ |____| (____ /|__| /____ > \___ >|__|
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// \/ \/ \/ \/
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// (C) 2015 Ingo Berg
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//
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// example1.cpp - using the parser as a static library
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//
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//---------------------------------------------------------------------------
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#include "muParserTest.h"
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#if defined(_WIN32) && defined(_DEBUG)
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#define _CRTDBG_MAP_ALLOC
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#include <crtdbg.h>
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#include <stdlib.h>
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#define CREATE_LEAKAGE_REPORT
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#endif
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#if defined(USINGDLL) && defined(_WIN32)
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#error This sample can be used only with STATIC builds of muParser (on win32)
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#endif
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/** \brief This macro will enable mathematical constants like M_PI. */
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#define _USE_MATH_DEFINES
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#include <cmath>
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#include <cstdlib>
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#include <cstring>
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#include <iomanip>
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#include <ios>
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#include <iostream>
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#include <limits>
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#include <locale>
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#include <numeric>
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#include <string>
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#include "muParser.h"
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using namespace std;
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using namespace mu;
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#if defined(CREATE_LEAKAGE_REPORT)
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// Dumping memory leaks in the destructor of the static guard
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// guarantees i won't get false positives from the ParserErrorMsg
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// class wich is a singleton with a static instance.
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struct DumpLeaks {
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~DumpLeaks() { _CrtDumpMemoryLeaks(); }
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} static LeakDumper;
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#endif
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// Operator callback functions
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ValueOrError Mega(value_type a_fVal) { return a_fVal * 1e6; }
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ValueOrError Milli(value_type a_fVal) { return a_fVal / (value_type)1e3; }
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ValueOrError Rnd(value_type v) { return v * std::rand() / (value_type)(RAND_MAX + 1.0); }
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ValueOrError Not(value_type v) { return v == 0; }
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ValueOrError Add(value_type v1, value_type v2) { return v1 + v2; }
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ValueOrError Mul(value_type v1, value_type v2) { return v1 * v2; }
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//---------------------------------------------------------------------------
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ValueOrError ThrowAnException(value_type) {
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throw std::runtime_error("This function does throw an exception.");
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}
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//---------------------------------------------------------------------------
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//---------------------------------------------------------------------------
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ValueOrError Ping() {
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mu::console() << "ping\n";
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return 0;
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}
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//---------------------------------------------------------------------------
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ValueOrError StrFun0(const char_type *szMsg) {
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if (szMsg) mu::console() << szMsg << std::endl;
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return 999;
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}
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//---------------------------------------------------------------------------
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ValueOrError StrFun2(const char_type *v1, value_type v2, value_type v3) {
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mu::console() << v1 << std::endl;
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return v2 + v3;
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}
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//---------------------------------------------------------------------------
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ValueOrError Debug(mu::value_type v1, mu::value_type v2) {
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ParserBase::EnableDebugDump(v1 != 0, v2 != 0);
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mu::console() << _T("Bytecode dumping ") << ((v1 != 0) ? _T("active") : _T("inactive"))
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<< _T("\n");
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return 1;
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}
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//---------------------------------------------------------------------------
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// Factory function for creating new parser variables
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// This could as well be a function performing database queries.
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value_type *AddVariable(const char_type *a_szName, void *a_pUserData) {
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// I don't want dynamic allocation here, so i used this static buffer
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// If you want dynamic allocation you must allocate all variables dynamically
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// in order to delete them later on. Or you find other ways to keep track of
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// variables that have been created implicitely.
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static value_type afValBuf[100];
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static int iVal = -1;
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++iVal;
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mu::console() << _T("Generating new variable \"") << a_szName << std::dec
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<< _T("\" (slots left: ") << 99 - iVal << _T(")")
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<< _T(" User data pointer is:") << std::hex << a_pUserData << endl;
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afValBuf[iVal] = 0;
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if (iVal >= 99)
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throw mu::ParserError(_T("Variable buffer overflow."));
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else
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return &afValBuf[iVal];
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}
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int IsHexValue(const char_type *a_szExpr, int *a_iPos, value_type *a_fVal) {
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if (a_szExpr[1] == 0 || (a_szExpr[0] != '0' || a_szExpr[1] != 'x')) return 0;
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unsigned iVal(0);
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// New code based on streams for UNICODE compliance:
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stringstream_type::pos_type nPos(0);
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stringstream_type ss(a_szExpr + 2);
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ss >> std::hex >> iVal;
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nPos = ss.tellg();
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if (nPos == (stringstream_type::pos_type)0) return 1;
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*a_iPos += (int)(2 + nPos);
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*a_fVal = (value_type)iVal;
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return 1;
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}
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//---------------------------------------------------------------------------
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void Splash() {
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mu::console() << _T(" __________ \n");
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mu::console() << _T(" _____ __ __\\______ \\_____ _______ ______ ____ _______\n");
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mu::console()
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<< _T(" / \\ | | \\| ___/\\__ \\ \\_ __ \\/ ___/_/ __ \\\\_ __ \\ \n");
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mu::console()
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<< _T(" | Y Y \\| | /| | / __ \\_| | \\/\\___ \\ \\ ___/ | | \\/ \n");
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mu::console() << _T(" |__|_| /|____/ |____| (____ /|__| /____ > \\___ >|__| \n");
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mu::console() << _T(" \\/ \\/ \\/ \\/ \n");
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mu::console() << _T(" (C) 2015 Ingo Berg\n");
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}
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//---------------------------------------------------------------------------
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ValueOrError SelfTest() {
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mu::console() << _T( "-----------------------------------------------------------\n");
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mu::console() << _T( "Running test suite:\n\n");
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// Skip the self test if the value type is set to an integer type.
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if (std::numeric_limits<mu::value_type>::is_integer) {
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mu::console()
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<< _T( " Test skipped: integer data type are not compatible with the unit test!\n\n");
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} else {
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mu::Test::ParserTester pt;
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pt.Run();
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}
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return 0;
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}
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//---------------------------------------------------------------------------
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ValueOrError Help() {
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mu::console() << _T( "-----------------------------------------------------------\n");
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mu::console() << _T( "Commands:\n\n");
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mu::console() << _T( " list var - list parser variables\n");
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mu::console() << _T( " list exprvar - list expression variables\n");
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mu::console() << _T( " list const - list all numeric parser constants\n");
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mu::console() << _T( " locale de - switch to german locale\n");
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mu::console() << _T( " locale en - switch to english locale\n");
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mu::console() << _T( " locale reset - reset locale\n");
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mu::console() << _T( " quit - exits the parser\n");
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mu::console() << _T( "\nConstants:\n\n");
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mu::console() << _T( " \"_e\" 2.718281828459045235360287\n");
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mu::console() << _T( " \"_pi\" 3.141592653589793238462643\n");
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mu::console() << _T( "-----------------------------------------------------------\n");
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return 0;
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}
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//---------------------------------------------------------------------------
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/*
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void CheckLocale()
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{
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// Local names:
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// "C" - the classic C locale
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// "de_DE" - not for Windows?
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// "en_US" - not for Windows?
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// "German_germany" - For MSVC8
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try
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{
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std::locale loc("German_germany");
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console() << _T("Locale settings:\n");
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console() << _T(" Decimal point: '") << std::use_facet<numpunct<char_type>
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>(loc).decimal_point() << _T("'\n");
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console() << _T(" Thousands sep: '") << std::use_facet<numpunct<char_type>
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>(loc).thousands_sep() << _T("'\n");
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console() << _T(" Grouping: '") << std::use_facet<numpunct<char_type> >(loc).grouping()
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<< _T("'\n");
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console() << _T(" True is named: '") << std::use_facet<numpunct<char_type> >(loc).truename()
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<< _T("'\n");
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console() << _T(" False is named: '") << std::use_facet<numpunct<char_type> >(loc).falsename()
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<< _T("'\n");
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console() << _T("-----------------------------------------------------------\n");
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}
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catch(...)
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{
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console() << _T("Locale settings:\n");
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console() << _T(" invalid locale name\n");
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console() << _T("-----------------------------------------------------------\n");
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}
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}
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//---------------------------------------------------------------------------
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void CheckDiff()
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{
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mu::Parser parser;
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value_type x = 1,
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v1,
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v2,
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v3,
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eps(pow(std::numeric_limits<value_type>::epsilon(), 0.2));
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parser.DefineVar(_T("x"), &x);
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parser.SetExpr(_T("_e^-x*sin(x)"));
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v1 = parser.Diff(&x, 1),
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v2 = parser.Diff(&x, 1, eps);
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v3 = cos((value_type)1.0)/exp((value_type)1) - sin((value_type)1.0)/exp((value_type)1);
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//-0.110793765307;
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mu::console() << parser.GetExpr() << _T("\n");
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mu::console() << _T("v1 = ") << v1 << _T("; v1-v3 = ") << v1-v3 << _T("\n");
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mu::console() << _T("v2 = ") << v2 << _T("; v2-v3 = ") << v2-v3 << _T("\n");
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}
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*/
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//---------------------------------------------------------------------------
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/** \brief Check for external keywords.
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*/
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int CheckKeywords(const mu::char_type *a_szLine, mu::Parser &a_Parser) {
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string_type sLine(a_szLine);
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if (sLine == _T("quit")) {
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return -1;
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} else if (sLine == _T("locale de")) {
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mu::console() << _T("Setting german locale: ArgSep=';' DecSep=',' ThousandsSep='.'\n");
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a_Parser.SetArgSep(';');
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a_Parser.SetDecSep(',');
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a_Parser.SetThousandsSep('.');
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return 1;
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} else if (sLine == _T("locale en")) {
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mu::console() << _T("Setting english locale: ArgSep=',' DecSep='.' ThousandsSep=''\n");
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a_Parser.SetArgSep(',');
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a_Parser.SetDecSep('.');
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a_Parser.SetThousandsSep();
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return 1;
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} else if (sLine == _T("locale reset")) {
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mu::console() << _T("Resetting locale\n");
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a_Parser.ResetLocale();
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return 1;
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}
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return 0;
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}
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//---------------------------------------------------------------------------
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void Calc() {
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mu::Parser parser;
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// Change locale settings if necessary
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// function argument separator: sum(2;3;4) vs. sum(2,3,4)
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// decimal separator: 3,14 vs. 3.14
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// thousands separator: 1000000 vs 1.000.000
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//#define USE_GERMAN_LOCALE
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#ifdef USE_GERMAN_LOCALE
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parser.SetArgSep(';');
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parser.SetDecSep(',');
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parser.SetThousandsSep('.');
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#else
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// this is the default, so i it's commented:
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// parser.SetArgSep(',');
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// parser.SetDecSep('.');
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// parser.SetThousandsSep('');
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#endif
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// Add some variables
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value_type vVarVal[] = {1, 2}; // Values of the parser variables
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parser.DefineVar(_T("a"),
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&vVarVal[0]); // Assign Variable names and bind them to the C++ variables
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parser.DefineVar(_T("b"), &vVarVal[1]);
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parser.DefineVar(_T("ft"), &vVarVal[1]);
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parser.DefineStrConst(_T("sVar1"), _T("Sample string 1"));
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parser.DefineStrConst(_T("sVar2"), _T("Sample string 2"));
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parser.AddValIdent(IsHexValue);
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// Add user defined unary operators
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parser.DefinePostfixOprt(_T("M"), Mega);
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parser.DefinePostfixOprt(_T("m"), Milli);
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parser.DefineInfixOprt(_T("!"), Not);
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parser.DefineFun(_T("strfun0"), StrFun0);
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parser.DefineFun(_T("strfun2"), StrFun2);
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parser.DefineFun(_T("ping"), Ping);
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parser.DefineFun(_T("rnd"), Rnd);
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parser.DefineFun(_T("throw"), ThrowAnException);
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parser.DefineOprt(_T("add"), Add, 0);
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parser.DefineOprt(_T("mul"), Mul, 1);
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// These are service and debug functions
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parser.DefineFun(_T("debug"), Debug);
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parser.DefineFun(_T("selftest"), SelfTest);
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parser.DefineFun(_T("help"), Help);
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parser.DefinePostfixOprt(_T("{ft}"), Milli);
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parser.DefinePostfixOprt(_T("ft"), Milli);
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#ifdef _DEBUG
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// parser.EnableDebugDump(1, 0);
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#endif
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// Define the variable factory
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parser.SetVarFactory(AddVariable, &parser);
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for (;;) {
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try {
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string_type sLine;
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std::getline(mu::console_in(), sLine);
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switch (CheckKeywords(sLine.c_str(), parser)) {
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case 0:
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break;
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case 1:
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continue;
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case -1:
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return;
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}
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if (!sLine.length()) continue;
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parser.SetExpr(sLine);
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mu::console() << std::setprecision(12);
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// There are multiple ways to retrieve the result...
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// 1.) If you know there is only a single return value or in case you only need the last
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// result of an expression consisting of comma separated subexpressions you can
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// simply use:
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mu::console() << _T("ans=") << *parser.Eval() << _T("\n");
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// 2.) As an alternative you can also retrieve multiple return values using this API:
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int nNum = parser.GetNumResults();
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if (nNum > 1) {
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mu::console() << _T("Multiple return values detected! Complete list:\n");
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// this is the hard way if you need to retrieve multiple subexpression
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// results
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std::vector<ValueOrError> vs;
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parser.Eval(&vs);
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mu::console() << std::setprecision(12);
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for (const ValueOrError &v : vs) {
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mu::console() << *v << _T("\n");
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}
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}
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} catch (mu::Parser::exception_type &e) {
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mu::console() << _T("\nError:\n");
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mu::console() << _T("------\n");
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mu::console() << _T("Message: ") << e.GetMsg() << _T("\n");
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mu::console() << _T("Expression: \"") << e.GetExpr() << _T("\"\n");
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mu::console() << _T("Token: \"") << e.GetToken() << _T("\"\n");
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mu::console() << _T("Position: ") << (int)e.GetPos() << _T("\n");
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mu::console() << _T("Errc: ") << std::dec << e.GetCode() << _T("\n");
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}
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} // while running
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}
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//---------------------------------------------------------------------------
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int main(int, char **) {
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Splash();
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(void)SelfTest();
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(void)Help();
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// CheckLocale();
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// CheckDiff();
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mu::console() << _T("Enter an expression or a command:\n");
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try {
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Calc();
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} catch (Parser::exception_type &e) {
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// Only erros raised during the initialization will end up here
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// formula related errors are treated in Calc()
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console() << _T("Initialization error: ") << e.GetMsg() << endl;
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console() << _T("aborting...") << endl;
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string_type sBuf;
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console_in() >> sBuf;
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} catch (std::exception & /*exc*/) {
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// there is no unicode compliant way to query exc.what()
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// so i'll leave it for this example.
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console() << _T("aborting...\n");
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}
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return 0;
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}
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