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C++ Mathematical Expression Library (ExprTk) http://www.partow.net/programming/exprtk/index.html

This commit is contained in:
Arash Partow 2013-03-06 21:41:54 +11:00
parent 1a800f4ff0
commit 73a594675e
1 changed files with 45 additions and 12 deletions
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55
exprtk.hpp
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@ -6474,6 +6474,12 @@ namespace exprtk
return allocate<ResultNode>(operation,branch[0],branch[1],branch[2],branch[3],branch[4],branch[5]); return allocate<ResultNode>(operation,branch[0],branch[1],branch[2],branch[3],branch[4],branch[5]);
} }
template <typename node_type>
inline expression_node<typename node_type::value_type>* allocate() const
{
return new node_type();
}
template <typename node_type, typename T1> template <typename node_type, typename T1>
inline expression_node<typename node_type::value_type>* allocate(T1& t1) const inline expression_node<typename node_type::value_type>* allocate(T1& t1) const
{ {
@ -8104,7 +8110,9 @@ namespace exprtk
{ {
if (expression_string.empty()) if (expression_string.empty())
{ {
set_error(parser_error::make_error(parser_error::e_syntax, "ERR00 - Empty expression!")); set_error(
make_error(parser_error::e_syntax,
"ERR00 - Empty expression!"));
return false; return false;
} }
@ -8137,7 +8145,9 @@ namespace exprtk
} }
else else
{ {
set_error(parser_error::make_error(parser_error::e_syntax, "ERR01 - Incomplete expression!")); set_error(
make_error(parser_error::e_syntax,
"ERR01 - Incomplete expression!"));
symbol_name_cache_.clear(); symbol_name_cache_.clear();
if (0 != e) if (0 != e)
{ {
@ -8764,8 +8774,18 @@ namespace exprtk
} }
else if (!token_is(token_t::e_rcrlbracket)) else if (!token_is(token_t::e_rcrlbracket))
return error_node(); return error_node();
expression_node_ptr result;
if (0 == (result = expression_generator_.while_loop(condition,branch)))
{
set_error(
make_error(parser_error::e_syntax,
current_token_,
"ERR18 - Failed to parse branch for while-loop"));
return error_node();
}
else else
return expression_generator_.while_loop(condition,branch); return result;
} }
template <typename Type, std::size_t NumberOfParameters> template <typename Type, std::size_t NumberOfParameters>
@ -8818,7 +8838,7 @@ namespace exprtk
set_error( set_error(
make_error(parser_error::e_token, make_error(parser_error::e_token,
current_token_, current_token_,
"ERR18 - Invalid special function[1]: " + current_token_.value)); "ERR19 - Invalid special function[1]: " + current_token_.value));
return error_node(); return error_node();
} }
@ -8829,7 +8849,7 @@ namespace exprtk
set_error( set_error(
make_error(parser_error::e_token, make_error(parser_error::e_token,
current_token_, current_token_,
"ERR19 - Invalid special function[2]: " + current_token_.value)); "ERR20 - Invalid special function[2]: " + current_token_.value));
return error_node(); return error_node();
} }
@ -8915,7 +8935,7 @@ namespace exprtk
set_error( set_error(
make_error(parser_error::e_syntax, make_error(parser_error::e_syntax,
current_token_, current_token_,
"ERR20 - Invalid number of parameters for function: " + symbol)); "ERR21 - Invalid number of parameters for function: " + symbol));
return error_node(); return error_node();
} }
} }
@ -8927,7 +8947,7 @@ namespace exprtk
set_error( set_error(
make_error(parser_error::e_syntax, make_error(parser_error::e_syntax,
current_token_, current_token_,
"ERR21 - Failed to generate node for function: '" + symbol + "'")); "ERR22 - Failed to generate node for function: '" + symbol + "'"));
return error_node(); return error_node();
} }
} }
@ -8936,7 +8956,7 @@ namespace exprtk
set_error( set_error(
make_error(parser_error::e_syntax, make_error(parser_error::e_syntax,
current_token_, current_token_,
"ERR22 - Undefined variable or function: '" + symbol + "'")); "ERR23 - Undefined variable or function: '" + symbol + "'"));
return error_node(); return error_node();
} }
} }
@ -8971,7 +8991,7 @@ namespace exprtk
set_error( set_error(
make_error(parser_error::e_symtab, make_error(parser_error::e_symtab,
current_token_, current_token_,
"ERR23 - Variable or function detected, yet symbol-table is invalid, Symbol: " + current_token_.value)); "ERR24 - Variable or function detected, yet symbol-table is invalid, Symbol: " + current_token_.value));
return error_node(); return error_node();
} }
} }
@ -9046,7 +9066,7 @@ namespace exprtk
set_error( set_error(
make_error(parser_error::e_syntax, make_error(parser_error::e_syntax,
current_token_, current_token_,
"ERR24 - Premature end of expression.[1]")); "ERR25 - Premature end of expression.[1]"));
return error_node(); return error_node();
} }
else else
@ -9054,7 +9074,7 @@ namespace exprtk
set_error( set_error(
make_error(parser_error::e_syntax, make_error(parser_error::e_syntax,
current_token_, current_token_,
"ERR25 - Premature end of expression.[2]")); "ERR26 - Premature end of expression.[2]"));
return error_node(); return error_node();
} }
} }
@ -9616,6 +9636,19 @@ namespace exprtk
inline expression_node_ptr while_loop(expression_node_ptr condition, inline expression_node_ptr while_loop(expression_node_ptr condition,
expression_node_ptr branch) const expression_node_ptr branch) const
{ {
if (details::is_constant_node(condition))
{
expression_node_ptr result = error_node();
if (details::is_true(condition))
//Infinite loops are not allowed.
result = error_node();
else
result = node_allocator_->allocate<details::null_node<Type> >();
free_node(*node_allocator_,condition);
free_node(*node_allocator_,branch);
return result;
}
else
return node_allocator_->allocate<while_loop_node_t>(condition,branch); return node_allocator_->allocate<while_loop_node_t>(condition,branch);
} }