99 lines
2.6 KiB
C++
99 lines
2.6 KiB
C++
/* file DefineExpr.cpp
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*
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* author: Roland Conybeare
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*/
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#include "DefineExpr.hpp"
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namespace xo {
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namespace ast {
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rp<DefineExpr>
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DefineExpr::make(std::string lhs_name,
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rp<Expression> rhs)
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{
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TypeDescr rhs_valuetype = nullptr;
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if (rhs)
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rhs_valuetype = rhs->valuetype();
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return new DefineExpr(rhs_valuetype,
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std::move(lhs_name),
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std::move(rhs));
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} /*make*/
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DefineExpr::DefineExpr(TypeDescr rhs_valuetype,
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std::string lhs_name,
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rp<Expression> rhs)
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: Expression(exprtype::define, rhs_valuetype),
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lhs_name_{std::move(lhs_name)},
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rhs_{std::move(rhs)}
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{
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this->free_var_set_ = this->calc_free_variables();
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}
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std::set<std::string>
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DefineExpr::calc_free_variables() const
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{
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std::set<std::string> retval;
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if (rhs_)
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retval = rhs_->get_free_variables();
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/* but remove this variable */
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if (!this->lhs_name().empty())
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retval.erase(this->lhs_name());
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return retval;
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} /*calc_free_variables*/
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void
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DefineExpr::display(std::ostream & os) const {
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os << "<Define"
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<< xtag("name", lhs_name_)
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<< xtag("rhs", rhs_)
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<< ">";
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} /*display*/
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// ----- DefineExprAccess -----
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rp<DefineExprAccess>
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DefineExprAccess::make(std::string lhs_name,
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rp<Expression> rhs)
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{
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TypeDescr rhs_valuetype = nullptr;
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if (rhs)
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rhs_valuetype = rhs->valuetype();
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return new DefineExprAccess(rhs_valuetype,
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std::move(lhs_name),
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std::move(rhs));
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}
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rp<DefineExprAccess>
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DefineExprAccess::make_empty()
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{
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return new DefineExprAccess(nullptr /*rhs_valuetype*/,
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"" /*lhs_name*/,
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nullptr /*rhs*/);
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}
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void
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DefineExprAccess::assign_rhs(const rp<Expression> & x)
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{
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assert(x);
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this->rhs_ = x;
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if (x) {
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this->assign_valuetype(x->valuetype());
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}
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this->free_var_set_ = this->calc_free_variables();
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}
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} /*namespace ast*/
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} /*namespace xo*/
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/* end DefineExpr.cpp */
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