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Simplify logical && || operator eval

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This commit is contained in:
Jason Turner 2015-01-31 13:41:29 -07:00
parent 722e9ed3d1
commit d558019bb3
2 changed files with 25 additions and 37 deletions
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41
include/chaiscript/language/chaiscript_eval.hpp
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@ -1483,26 +1483,8 @@ namespace chaiscript
AST_Node(t_ast_node_text, AST_Node_Type::Logical_And, t_fname, t_start_line, t_start_col, t_end_line, t_end_col) { } AST_Node(t_ast_node_text, AST_Node_Type::Logical_And, t_fname, t_start_line, t_start_col, t_end_line, t_end_col) { }
virtual ~Logical_And_AST_Node() {} virtual ~Logical_And_AST_Node() {}
virtual Boxed_Value eval_internal(chaiscript::detail::Dispatch_Engine &t_ss) const CHAISCRIPT_OVERRIDE{ virtual Boxed_Value eval_internal(chaiscript::detail::Dispatch_Engine &t_ss) const CHAISCRIPT_OVERRIDE{
Boxed_Value retval = this->children[0]->eval(t_ss); return const_var(get_bool_condition(this->children[0]->eval(t_ss))
&& get_bool_condition(this->children[2]->eval(t_ss)));
if (this->children.size() > 1) {
for (size_t i = 1; i < this->children.size(); i += 2) {
bool lhs;
try {
lhs = boxed_cast<bool>(retval);
}
catch (const exception::bad_boxed_cast &) {
throw exception::eval_error("Condition not boolean");
}
if (lhs) {
retval = this->children[i+1]->eval(t_ss);
}
else {
retval = Boxed_Value(false);
}
}
}
return retval;
} }
virtual std::string pretty_print() const CHAISCRIPT_OVERRIDE virtual std::string pretty_print() const CHAISCRIPT_OVERRIDE
@ -1517,23 +1499,8 @@ namespace chaiscript
AST_Node(t_ast_node_text, AST_Node_Type::Logical_Or, t_fname, t_start_line, t_start_col, t_end_line, t_end_col) { } AST_Node(t_ast_node_text, AST_Node_Type::Logical_Or, t_fname, t_start_line, t_start_col, t_end_line, t_end_col) { }
virtual ~Logical_Or_AST_Node() {} virtual ~Logical_Or_AST_Node() {}
virtual Boxed_Value eval_internal(chaiscript::detail::Dispatch_Engine &t_ss) const CHAISCRIPT_OVERRIDE{ virtual Boxed_Value eval_internal(chaiscript::detail::Dispatch_Engine &t_ss) const CHAISCRIPT_OVERRIDE{
Boxed_Value retval; return const_var(get_bool_condition(this->children[0]->eval(t_ss))
|| get_bool_condition(this->children[2]->eval(t_ss)));
retval = this->children[0]->eval(t_ss);
if (this->children.size() > 1) {
for (size_t i = 1; i < this->children.size(); i += 2) {
bool lhs = boxed_cast<bool>(retval);
if (lhs) {
retval = Boxed_Value(true);
}
else {
retval = this->children[i+1]->eval(t_ss);
}
}
}
return retval;
} }
virtual std::string pretty_print() const CHAISCRIPT_OVERRIDE virtual std::string pretty_print() const CHAISCRIPT_OVERRIDE

21
unittests/logical_short_circuiting.chai Normal file
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@ -0,0 +1,21 @@
def shouldnt_execute()
{
assert(false)
}
if (false && shouldnt_execute()) {
}
if (true || shouldnt_execute()) {
}
if (false || false || false || true || shouldnt_execute()) {
}
if (true && true && true && false && shouldnt_execute()) {
}