44 lines
1.1 KiB
C++
44 lines
1.1 KiB
C++
/* file LocalEnv.cpp
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*
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* author: Roland Conybeare
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*/
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#include "LocalEnv.hpp"
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namespace xo {
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namespace ast {
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binding_path
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LocalEnv::lookup_local_binding(const std::string & vname) const
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{
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int j_slot = 0;
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for (const auto & arg : argv_) {
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if (arg->name() == vname)
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return { 0 /*i_link*/, j_slot };
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++j_slot;
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}
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return { -2 /*i_link: sentinel*/, 0 };
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} /*lookup_local_binding*/
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binding_path
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LocalEnv::lookup_binding(const std::string & vname) const
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{
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{
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auto local = this->lookup_local_binding(vname);
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if (local.i_link_ == 0)
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return local;
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}
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auto free = parent_env_->lookup_binding(vname);
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if (free.i_link_ == -1)
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return free;
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else
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return { free.i_link_ + 1, free.j_slot_ };
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} /*lookup_binding*/
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} /*namespace ast*/
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} /*namespace xo*/
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/* end LocalEnv.cpp */
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