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exprtk_repl.cpp
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/*
**************************************************************
* C++ Mathematical Expression Toolkit Library *
* *
* ExprTk REPL (Read Evaluate Print Loop) Interface *
* Author: Arash Partow (1999-2021) *
* URL: http://www.partow.net/programming/exprtk/index.html *
* *
* Copyright notice: *
* Free use of the Mathematical Expression Toolkit Library is *
* permitted under the guidelines and in accordance with the *
* most current version of the MIT License. *
* http://www.opensource.org/licenses/MIT *
* *
**************************************************************
*/
#include <algorithm>
#include <cstdio>
#include <deque>
#include <fstream>
#include <iostream>
#include <numeric>
#include <string>
#include "exprtk.hpp"
template <typename T>
struct putch : public exprtk::ifunction<T>
{
using exprtk::ifunction<T>::operator();
putch() : exprtk::ifunction<T>(1) {}
inline T operator()(const T& v)
{
printf("%c",static_cast<int>(v));
return T(0);
}
};
template <typename T>
struct putint : public exprtk::ifunction<T>
{
using exprtk::ifunction<T>::operator();
putint() : exprtk::ifunction<T>(1) {}
inline T operator()(const T& v)
{
printf("%d",static_cast<int>(v));
return T(0);
}
};
template <typename T>
struct rnd_01 : public exprtk::ifunction<T>
{
using exprtk::ifunction<T>::operator();
rnd_01() : exprtk::ifunction<T>(0)
{ ::srand(static_cast<unsigned int>(time(NULL))); }
inline T operator()()
{
// Note: Do not use this in production
// Result is in the interval [0,1)
return T(::rand() / T(RAND_MAX + 1.0));
}
};
template <typename T>
class expression_processor
{
public:
typedef exprtk::symbol_table<T> symbol_table_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_t;
typedef exprtk::parser_error::type error_t;
typedef exprtk::function_compositor<T> compositor_t;
typedef typename compositor_t::function function_t;
typedef typename parser_t::settings_store settings_store_t;
typedef exprtk::lexer::parser_helper prsrhlpr_t;
typedef typename parser_t::dependent_entity_collector::symbol_t symbol_t;
typedef std::vector<symbol_t> symbol_list_t;
expression_processor()
: persist_symbol_table_ (false),
symbol_dump_ (false),
assignment_dump_ (false),
display_total_time_ (false),
display_total_compile_time_(false),
enable_usr_ (false),
disable_local_vardef_ (false),
batch_runs_cnt_ (0),
compositor_(function_symbol_table_)
#ifdef exprtk_enable_repl_variables
,s0_("abcdefghijk"),
s1_("abcdefghijk0123456789"),
s2_("012345678901234567890123456789"),
v0_({1,1,1}),
v1_({2,2,2,2,2}),
v2_({3,3,3,3,3,3,3}),
v3_({4,4,4,4,4,4,4,4}),
vv_(exprtk::make_vector_view(v2_,v2_.size()))
#endif
{
symbol_table_.add_constants();
symbol_table_.add_function("putch" ,putch_ );
symbol_table_.add_function("putint" ,putint_ );
symbol_table_.add_function("rnd_01" ,rnd_01_ );
symbol_table_.add_package (fileio_package_ );
symbol_table_.add_package (vecops_package_ );
symbol_table_.add_package (io_package_ );
symbol_table_.add_function("poly01", poly01_);
symbol_table_.add_function("poly02", poly02_);
symbol_table_.add_function("poly03", poly03_);
symbol_table_.add_function("poly04", poly04_);
symbol_table_.add_function("poly05", poly05_);
symbol_table_.add_function("poly06", poly06_);
symbol_table_.add_function("poly07", poly07_);
symbol_table_.add_function("poly08", poly08_);
symbol_table_.add_function("poly09", poly09_);
symbol_table_.add_function("poly10", poly10_);
symbol_table_.add_function("poly11", poly11_);
symbol_table_.add_function("poly12", poly12_);
#ifdef exprtk_enable_repl_variables
symbol_table_.add_stringvar("s0",s0_);
symbol_table_.add_stringvar("s1",s1_);
symbol_table_.add_stringvar("s2",s2_);
symbol_table_.add_vector ("v0",v0_);
symbol_table_.add_vector ("v1",v1_);
symbol_table_.add_vector ("v2",v2_);
symbol_table_.add_vector ("v3",v3_);
vv_ = exprtk::make_vector_view(v2_,v2_.size());
symbol_table_.add_vector ("vv",vv_);
#endif
compositor_.add_auxiliary_symtab(symbol_table_);
arith_opr_["+"] = settings_store_t::e_arith_add;
arith_opr_["-"] = settings_store_t::e_arith_sub;
arith_opr_["*"] = settings_store_t::e_arith_mul;
arith_opr_["/"] = settings_store_t::e_arith_div;
arith_opr_["%"] = settings_store_t::e_arith_mod;
arith_opr_["^"] = settings_store_t::e_arith_pow;
assign_opr_[":="] = settings_store_t::e_assign_assign;
assign_opr_["+="] = settings_store_t::e_assign_addass;
assign_opr_["-="] = settings_store_t::e_assign_subass;
assign_opr_["*="] = settings_store_t::e_assign_mulass;
assign_opr_["/="] = settings_store_t::e_assign_divass;
assign_opr_["%="] = settings_store_t::e_assign_modass;
inequality_opr_[ "<"] = settings_store_t::e_ineq_lt;
inequality_opr_["<="] = settings_store_t::e_ineq_lte;
inequality_opr_["=="] = settings_store_t::e_ineq_eq;
inequality_opr_[ "="] = settings_store_t::e_ineq_equal;
inequality_opr_["!="] = settings_store_t::e_ineq_ne;
inequality_opr_["<>"] = settings_store_t::e_ineq_nequal;
inequality_opr_[">="] = settings_store_t::e_ineq_gte;
inequality_opr_[ ">"] = settings_store_t::e_ineq_gt;
clear_functions();
}
~expression_processor()
{
clear_functions();
}
bool& persist_symbol_table()
{
return persist_symbol_table_;
}
bool& symbol_dump()
{
return symbol_dump_;
}
bool& assignment_dump()
{
return assignment_dump_;
}
bool& display_total_time()
{
return display_total_time_;
}
bool& display_total_compile_time()
{
return display_total_compile_time_;
}
bool& enable_usr()
{
return enable_usr_;
}
bool& disable_local_vardef()
{
return disable_local_vardef_;
}
void setup_symbol_table()
{
if (!persist_symbol_table_)
{
symbol_table_.clear_variables();
symbol_table_.add_constants();
symbol_table_.add_constant ("e",exprtk::details::numeric::constant::e);
}
}
void process(std::string program)
{
program = trim_whitespace(program);
if (program.empty())
return;
setup_symbol_table();
expression_t expression;
expression.register_symbol_table(symbol_table_);
expression.register_symbol_table(function_symbol_table_);
exprtk::timer compile_timer;
compile_timer.start();
if (enable_usr_)
parser_.enable_unknown_symbol_resolver();
else
parser_.disable_unknown_symbol_resolver();
if (disable_local_vardef_)
parser_.settings().disable_local_vardef();
else
parser_.settings().enable_local_vardef();
parser_.dec().collect_variables() = symbol_dump_;
parser_.dec().collect_functions() = symbol_dump_;
parser_.dec().collect_assignments() = assignment_dump_;
if (!parser_.compile(program,expression))
{
printf("Error: %s\tExpression:%c%s\n",
parser_.error().c_str(),
((std::string::npos != program.find_first_of('\n')) ? '\n' : ' '),
((program.size() < 200) ? program.c_str() : "....."));
for (std::size_t i = 0; i < parser_.error_count(); ++i)
{
error_t error = parser_.get_error(i);
printf("Err No.: %02d Pos: %02d Type: [%14s] Msg: %s\n",
static_cast<unsigned int>(i),
static_cast<unsigned int>(error.token.position),
exprtk::parser_error::to_str(error.mode).c_str(),
error.diagnostic.c_str());
if (
(0 == i) &&
exprtk::parser_error::update_error(error,program)
)
{
printf("Error (line: %d column: %d)\n",
static_cast<unsigned int>(error.line_no),
static_cast<unsigned int>(error.column_no));
printf("%s \n",error.error_line.c_str());
printf("%s^\n",std::string(error.column_no,'~').c_str());
}
}
return;
}
compile_timer.stop();
if (display_total_compile_time_)
{
printf("\nCompile time: %6.3fms\n",compile_timer.time() * 1000.0);
}
if (batch_runs_cnt_)
{
std::vector<double> timings(batch_runs_cnt_,0.0);
exprtk::timer total_timer;
exprtk::timer timer;
T result = T(0);
total_timer.start();
for (std::size_t i = 0; i < batch_runs_cnt_; ++i)
{
timer.start();
result = expression.value();
timer.stop();
timings[i] = timer.time() * 1000.0;
}
total_timer.stop();
printf("\nResult: %15.9f\n",result);
std::sort(timings.begin(),timings.end());
printf("\nRuns: %4d Time min: %7.3fms max: %7.3fms avg: %7.3fms tot: %7.3fms 90%%:%7.3fms\n",
static_cast<unsigned int>(batch_runs_cnt_),
timings.front(),
timings.back (),
std::accumulate(timings.begin(),timings.end(),0.0) / timings.size(),
total_timer.time() * 1000.0,
timings[static_cast<int>(timings.size() * 0.90)]);
return;
}
exprtk::timer timer;
timer.start();
T result = expression.value();
timer.stop();
if (expression.results().count())
{
print_results(expression.results());
}
printf("\nResult: %15.9f\n",result);
if (display_total_time_)
{
printf("\nTotal time: %6.3fms\n",timer.time() * 1000.0);
}
if (symbol_dump_)
{
symbol_list_t symbol_list;
parser_.dec().symbols(symbol_list);
printf("------ Symbols ------\n");
perform_symbol_dump(symbol_list);
printf("---------------------\n");
}
if (assignment_dump_)
{
symbol_list_t assignment_list;
parser_.dec().assignment_symbols(assignment_list);
printf("---- Assignments ----\n");
perform_symbol_dump(assignment_list);
printf("---------------------\n");
}
}
void process_from_file(const std::string& file_name)
{
if (file_name.empty())
return;
std::ifstream stream(file_name.c_str());
if (!stream)
{
printf("ERROR: Failed to open file: %s\n\n",file_name.c_str());
return;
}
std::string program(
(std::istreambuf_iterator<char>(stream)),
(std::istreambuf_iterator<char>())
);
process_function_definition(program,false);
}
void process_directive(std::string expression)
{
expression = trim_whitespace(expression);
if ('$' != expression[0])
return;
else if ("$enable_cache" == expression)
persist_symbol_table() = true;
else if ("$disable_cache" == expression)
persist_symbol_table() = false;
else if ("$enable_symbol_dump" == expression)
symbol_dump() = true;
else if ("$disable_symbol_dump" == expression)
symbol_dump() = false;
else if ("$enable_assignment_dump" == expression)
assignment_dump() = true;
else if ("$disable_assignment_dump" == expression)
assignment_dump() = false;
else if ("$enable_timer" == expression)
display_total_time() = true;
else if ("$enable_compile_timer" == expression)
display_total_compile_time() = true;
else if ("$disable_timer" == expression)
display_total_time() = false;
else if ("$disable_compile_timer" == expression)
display_total_compile_time() = false;
else if ("$enable_usr" == expression)
enable_usr() = true;
else if ("$disable_usr" == expression)
enable_usr() = false;
else if ("$enable_local_vardef" == expression)
disable_local_vardef() = false;
else if ("$disable_local_vardef" == expression)
disable_local_vardef() = true;
else if ("$list_vars" == expression)
list_symbols();
else if ("$clear_functions" == expression)
clear_functions();
else if ((0 == expression.find("$batch_run ")) && (expression.size() >= 12))
process_batch_run(expression.substr(11,expression.size() - 11));
else if ((0 == expression.find("$load ")) && (expression.size() > 7))
process_from_file(expression.substr(6,expression.size() - 6));
else if ((0 == expression.find("$disable arithmetic ")) && (expression.size() >= 21))
process_disable_arithmetic(expression.substr(20,expression.size() - 20));
else if ((0 == expression.find("$disable assignment ")) && (expression.size() >= 21))
process_disable_assignment(expression.substr(20,expression.size() - 20));
else if ((0 == expression.find("$disable inequality ")) && (expression.size() >= 21))
process_disable_inequality(expression.substr(20,expression.size() - 20));
else if ((0 == expression.find("$enable arithmetic ")) && (expression.size() >= 20))
process_enable_arithmetic(expression.substr(19,expression.size() - 19));
else if ((0 == expression.find("$enable assignment ")) && (expression.size() >= 20))
process_enable_assignment(expression.substr(19,expression.size() - 19));
else if ((0 == expression.find("$enable inequality ")) && (expression.size() >= 20))
process_enable_inequality(expression.substr(19,expression.size() - 19));
else if ("$begin" == expression)
process_multiline();
else if (0 == expression.find("$function"))
process_function_definition(expression);
else
printf("\nERROR - Invalid directive: %s\n",expression.c_str());
}
private:
void print_results(const exprtk::results_context<T>& results)
{
typedef exprtk::results_context<T> results_context_t;
typedef typename results_context_t::type_store_t type_t;
typedef typename type_t::scalar_view scalar_t;
typedef typename type_t::vector_view vector_t;
typedef typename type_t::string_view string_t;
typename exprtk::details::numeric::details::number_type<T>::type num_type;
printf("%s\n",std::string(10,'-').c_str());
printf("Return Results (#%d)\n",static_cast<int>(results.count()));
for (std::size_t i = 0; i < results.count(); ++i)
{
printf("[%02d] ",static_cast<int>(i));
type_t t = results[i];
switch (t.type)
{
case type_t::e_scalar : printf("Scalar\t");
exprtk::rtl::io::details::print_type("%10.5f",scalar_t(t)(),num_type);
break;
case type_t::e_vector : {
printf("Vector\t");
vector_t vector(t);
for (std::size_t x = 0; x < vector.size(); ++x)
{
exprtk::rtl::io::details::print_type("%10.5f",vector[x],num_type);
if ((x + 1) < vector.size())
printf(" ");
}
}
break;
case type_t::e_string : printf("String\t");
printf("%s",to_str(string_t(t)).c_str());
break;
default : continue;
}
printf("\n");
}
printf("%s\n",std::string(10,'-').c_str());
}
void perform_symbol_dump(const symbol_list_t& variable_list) const
{
for (std::size_t i = 0; i < variable_list.size(); ++i)
{
const symbol_t& symbol = variable_list[i];
switch (symbol.second)
{
case parser_t::e_st_variable : printf("[%02d] Variable %s\n",
static_cast<int>(i),symbol.first.c_str());
break;
case parser_t::e_st_vector : printf("[%02d] Vector %s\n",
static_cast<int>(i),symbol.first.c_str());
break;
case parser_t::e_st_string : printf("[%02d] String %s\n",
static_cast<int>(i),symbol.first.c_str());
break;
case parser_t::e_st_function : printf("[%02d] Function %s\n",
static_cast<int>(i),symbol.first.c_str());
break;
case parser_t::e_st_local_variable
: printf("[%02d] LocalVar %s\n",
static_cast<int>(i),symbol.first.c_str());
break;
case parser_t::e_st_local_vector
: printf("[%02d] LocalVec %s\n",
static_cast<int>(i),symbol.first.c_str());
break;
case parser_t::e_st_local_string
: printf("[%02d] LocalStr %s\n",
static_cast<int>(i),symbol.first.c_str());
break;
default : break;
}
}
}
void process_batch_run(const std::string& batch_runs_cnt)
{
batch_runs_cnt_ = atoi(batch_runs_cnt.c_str());
}
void process_multiline()
{
std::string program;
for ( ; ; )
{
std::string line;
std::cout << ">> ";
std::getline(std::cin,line);
line = trim_whitespace(line);
if (line.empty())
continue;
else if ("$end" == line)
break;
else
program += (line + "\n");
}
process(program);
}
struct function_definition
{
std::string name;
std::string body;
std::vector<std::string> var_list;
void clear()
{
name .clear();
body .clear();
var_list.clear();
}
};
enum func_parse_result
{
e_parse_unknown = 0,
e_parse_success = 1,
e_parse_partial = 2,
e_parse_lexfail = 4,
e_parse_notfunc = 8
};
struct parse_function_definition_impl : public exprtk::lexer::parser_helper
{
func_parse_result process(std::string& func_def, function_definition& fd)
{
if (!init(func_def))
return e_parse_lexfail;
if (!token_is(token_t::e_symbol,"function"))
return e_parse_notfunc;
if (!token_is(token_t::e_symbol,prsrhlpr_t::e_hold))
return e_parse_partial;
fd.name = current_token().value;
next_token();
if (!token_is(token_t::e_lbracket))
return e_parse_partial;
if (!token_is(token_t::e_rbracket))
{
std::vector<std::string> var_list;
for ( ; ; )
{
// (x,y,z,....w)
if (!token_is(token_t::e_symbol,prsrhlpr_t::e_hold))
return e_parse_partial;
var_list.push_back(current_token().value);
next_token();
if (token_is(token_t::e_rbracket))
break;
if (!token_is(token_t::e_comma))
return e_parse_partial;
}
var_list.swap(fd.var_list);
}
std::size_t body_begin = current_token().position;
std::size_t body_end = current_token().position;
int bracket_stack = 0;
if (!token_is(token_t::e_lcrlbracket,prsrhlpr_t::e_hold))
return e_parse_partial;
for ( ; ; )
{
body_end = current_token().position;
if (token_is(token_t::e_lcrlbracket))
bracket_stack++;
else if (token_is(token_t::e_rcrlbracket))
{
if (0 == --bracket_stack)
break;
}
else
{
if (lexer().finished())
return e_parse_partial;
next_token();
}
}
std::size_t size = body_end - body_begin + 1;
fd.body = func_def.substr(body_begin,size);
const std::size_t index = body_begin + size;
if (index < func_def.size())
func_def = func_def.substr(index,func_def.size() - index);
else
func_def = "";
return e_parse_success;
}
};
func_parse_result parse_function_definition(std::string& func_def, function_definition& cf)
{
parse_function_definition_impl parser;
return parser.process(func_def,cf);
}
std::string read_from_stdin()
{
std::string input;
for ( ; ; )
{
std::string line;
std::cout << ">> ";
std::getline(std::cin,line);
if (line.empty())
continue;
else if ("$end" == line)
break;
else
input += (line + "\n");
}
if (!input.empty())
input.erase(input.end() - 1);
return input;
}
void process_function_definition(const std::string& func_def_header, bool read_stdin = true)
{
std::string func_def = func_def_header;
if (read_stdin)
{
func_def += read_from_stdin();
if (!func_def.empty() && ('$' == func_def[0]))
func_def.erase(func_def.begin());
}
do
{
function_definition fd;
func_parse_result fp_result = parse_function_definition(func_def,fd);
if (e_parse_success == fp_result)
{
std::string vars;
for (std::size_t i = 0; i < fd.var_list.size(); ++i)
{
vars += fd.var_list[i] + ((i < fd.var_list.size() - 1) ? "," : "");
}
function_t f(fd.name);
for (std::size_t i = 0; i < fd.var_list.size(); ++i)
{
f.var(fd.var_list[i]);
}
f.expression(fd.body);
if (function_symbol_table_.get_function(fd.name))
{
function_symbol_table_.remove_function(fd.name);
for (std::size_t i = 0; i < func_def_list_.size(); ++i)
{
if (exprtk::details::imatch(fd.name, func_def_list_[i].name))
{
func_def_list_.erase(func_def_list_.begin() + i);
break;
}
}
}
if (!compositor_.add(f,true))
{
function_symbol_table_.remove_function(fd.name);
printf("Error - Failed to add function: %s\n",fd.name.c_str());
return;
}
printf("Function[%02d]\n",static_cast<int>(func_def_list_.size()));
printf("Name: %s \n",fd.name.c_str() );
printf("Vars: (%s) \n",vars.c_str() );
printf("------------------------------------------------------\n");
func_def_list_.push_back(fd);
}
else if (e_parse_notfunc != fp_result)
{
printf("Error - Critical parsing error - partial parse occured\n");
return;
}
else
break;
}
while (!func_def.empty());
if (!func_def.empty())
{
process(func_def);
}
}
void list_symbols()
{
std::deque<std::pair<std::string,T> > variable_list;
symbol_table_.get_variable_list(variable_list);
std::size_t max_varname_length = 0;
for (std::size_t i = 0; i < variable_list.size(); ++i)
{
max_varname_length = std::max(max_varname_length,variable_list[i].first.size());
}
for (std::size_t i = 0; i < variable_list.size(); ++i)
{
int pad_length = 0;
if (max_varname_length > variable_list[i].first.size())
{
pad_length = static_cast<int>(max_varname_length - variable_list[i].first.size());
}
printf("%02d %s%*.*s %25.10f\n",
static_cast<unsigned int>(i),
variable_list[i].first.c_str(),
pad_length,
pad_length,
std::string(max_varname_length,' ').c_str(),
variable_list[i].second);
}
}
void clear_functions()
{
func_def_list_.clear();
function_symbol_table_.clear();
}
std::string trim_whitespace(std::string s)
{
static const std::string whitespace(" \n\r\t\b\v\f");
if (!s.empty())
{
s.erase(0,s.find_first_not_of(whitespace));
if (!s.empty())
{
std::size_t index = s.find_last_not_of(whitespace);
if (std::string::npos != index)
s.erase(index + 1);
else
s.clear();
}
}
return s;
}
void process_disable_arithmetic(const std::string& arithmetic)
{
typename std::map<std::string,typename settings_store_t::settings_arithmetic_opr>::iterator itr;
if (arith_opr_.end() != (itr = arith_opr_.find(arithmetic)))
{
parser_.settings()
.disable_arithmetic_operation(itr->second);
}
}
void process_disable_assignment(const std::string& assignment)
{
typename std::map<std::string,typename settings_store_t::settings_assignment_opr>::iterator itr;
if (assign_opr_.end() != (itr = assign_opr_.find(assignment)))
{
parser_.settings()
.disable_assignment_operation(itr->second);
}
}
void process_disable_inequality(const std::string& inequality)
{
typename std::map<std::string,typename settings_store_t::settings_inequality_opr>::iterator itr;
if (inequality_opr_.end() != (itr = inequality_opr_.find(inequality)))
{
parser_.settings()
.disable_inequality_operation(itr->second);
}
}
void process_enable_arithmetic(const std::string& arithmetic)
{
typename std::map<std::string,typename settings_store_t::settings_arithmetic_opr>::iterator itr;
if (arith_opr_.end() != (itr = arith_opr_.find(arithmetic)))
{
parser_.settings()
.enable_arithmetic_operation(itr->second);
}
}
void process_enable_assignment(const std::string& assignment)
{
typename std::map<std::string,typename settings_store_t::settings_assignment_opr>::iterator itr;
if (assign_opr_.end() != (itr = assign_opr_.find(assignment)))
{
parser_.settings()
.enable_assignment_operation(itr->second);
}
}
void process_enable_inequality(const std::string& inequality)
{
typename std::map<std::string,typename settings_store_t::settings_inequality_opr>::iterator itr;
if (inequality_opr_.end() != (itr = inequality_opr_.find(inequality)))
{
parser_.settings()
.enable_inequality_operation(itr->second);
}
}
private:
bool persist_symbol_table_;
bool symbol_dump_;
bool assignment_dump_;
bool display_total_time_;
bool display_total_compile_time_;
bool enable_usr_;
bool disable_local_vardef_;
std::size_t batch_runs_cnt_;
symbol_table_t symbol_table_;
symbol_table_t function_symbol_table_;
parser_t parser_;
compositor_t compositor_;
putch <T> putch_;
putint <T> putint_;
rnd_01 <T> rnd_01_;
exprtk::rtl::io::file::package<T> fileio_package_;
exprtk::rtl::vecops::package<T> vecops_package_;
exprtk::rtl::io::package<T> io_package_;
exprtk::polynomial<T, 1> poly01_;
exprtk::polynomial<T, 2> poly02_;
exprtk::polynomial<T, 3> poly03_;
exprtk::polynomial<T, 4> poly04_;
exprtk::polynomial<T, 5> poly05_;
exprtk::polynomial<T, 6> poly06_;
exprtk::polynomial<T, 7> poly07_;
exprtk::polynomial<T, 8> poly08_;
exprtk::polynomial<T, 9> poly09_;
exprtk::polynomial<T,10> poly10_;
exprtk::polynomial<T,11> poly11_;
exprtk::polynomial<T,12> poly12_;
std::vector<function_definition> func_def_list_;
std::map<std::string,typename settings_store_t::settings_arithmetic_opr> arith_opr_;
std::map<std::string,typename settings_store_t::settings_assignment_opr> assign_opr_;
std::map<std::string,typename settings_store_t::settings_inequality_opr> inequality_opr_;
#ifdef exprtk_enable_repl_variables
std::string s0_;
std::string s1_;
std::string s2_;
std::vector<T> v0_;
std::vector<T> v1_;
std::vector<T> v2_;
std::vector<T> v3_;
exprtk::vector_view<T> vv_;
#endif
};
template <typename T>
void repl(int argc, char* argv[])
{
expression_processor<T> processor;
if (argc > 1)
{
for (int i = 1; i < argc; ++i)
{