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Allow folding of if blocks

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This commit is contained in:
Jason Turner 2016-04-25 21:32:48 -06:00
parent 184ca7f7b2
commit f6c69f2826
3 changed files with 23 additions and 3 deletions
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4
include/chaiscript/language/chaiscript_engine.hpp
View File

@ -219,7 +219,7 @@ namespace chaiscript
std::vector<std::string> t_modulepaths = std::vector<std::string>(),
std::vector<std::string> t_usepaths = std::vector<std::string>())
: m_module_paths(std::move(t_modulepaths)), m_use_paths(std::move(t_usepaths)),
m_parser(std::make_unique<parser::ChaiScript_Parser<optimizer::Optimizer<optimizer::Block, optimizer::Constant_Fold, optimizer::Return, optimizer::For_Loop>>>())
m_parser(std::make_unique<parser::ChaiScript_Parser<optimizer::Optimizer<optimizer::Block, optimizer::Constant_Fold, optimizer::If, optimizer::Return, optimizer::For_Loop>>>())
{
if (m_module_paths.empty())
{
@ -244,7 +244,7 @@ namespace chaiscript
ChaiScript( std::vector<std::string> t_modulepaths = std::vector<std::string>(),
std::vector<std::string> t_usepaths = std::vector<std::string>())
: m_module_paths(std::move(t_modulepaths)), m_use_paths(std::move(t_usepaths)),
m_parser(std::make_unique<parser::ChaiScript_Parser<optimizer::Optimizer<optimizer::Block, optimizer::Constant_Fold, optimizer::Return, optimizer::For_Loop>>>())
m_parser(std::make_unique<parser::ChaiScript_Parser<optimizer::Optimizer<optimizer::Block, optimizer::Constant_Fold, optimizer::If, optimizer::Return, optimizer::For_Loop>>>())
{
if (m_module_paths.empty())
{

2
include/chaiscript/language/chaiscript_eval.hpp
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@ -653,7 +653,7 @@ namespace chaiscript
struct Ternary_Cond_AST_Node final : AST_Node {
Ternary_Cond_AST_Node(std::string t_ast_node_text, Parse_Location t_loc, std::vector<AST_NodePtr> t_children) :
AST_Node(std::move(t_ast_node_text), AST_Node_Type::If, std::move(t_loc), std::move(t_children))
AST_Node(std::move(t_ast_node_text), AST_Node_Type::Ternary_Cond, std::move(t_loc), std::move(t_children))
{ assert(children.size() == 3); }
Boxed_Value eval_internal(const chaiscript::detail::Dispatch_State &t_ss) const override {

20
include/chaiscript/language/chaiscript_optimizer.hpp
View File

@ -107,6 +107,26 @@ namespace chaiscript {
}
};
struct If {
AST_NodePtr optimize(const AST_NodePtr &node) {
if ((node->identifier == AST_Node_Type::If || node->identifier == AST_Node_Type::Ternary_Cond)
&& node->children.size() >= 2
&& node->children[0]->identifier == AST_Node_Type::Constant)
{
const auto condition = std::dynamic_pointer_cast<eval::Constant_AST_Node>(node->children[0])->m_value;
if (condition.get_type_info().bare_equal_type_info(typeid(bool))) {
if (boxed_cast<bool>(condition)) {
return node->children[1];
} else if (node->children.size() == 3) {
return node->children[2];
}
}
}
return node;
}
};
struct Constant_Fold {
AST_NodePtr optimize(const AST_NodePtr &node) {