github-mirror/fish-shell
2
0
Fork 0
mirror of https://github.com/fish-shell/fish-shell.git synced 2024-12-04 00:53:41 +08:00
Code Issues Actions 2 Packages Projects Releases Wiki Activity
5655f255ef
fish-shell/muparser-2.2.5/samples/example1/example1.cpp
ridiculousfish 5655f255ef [muparser] Add a muParser ValueOrError type 
First steps towards removing exceptions from muParser.
2017-12-18 23:01:15 -08:00

474 lines
17 KiB
C++
Raw Blame History

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