42205f27fc
Instead of using a custom Args* iterator, use the one belonging to the map type directly.
75 lines
1.7 KiB
C++
75 lines
1.7 KiB
C++
// This file implements the underlying structure of Nix attribute sets.
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#pragma once
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#include <absl/container/btree_map.h>
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#include "nixexpr.hh"
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#include "symbol-table.hh"
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#include "types.hh" // TODO(tazjin): audit this include
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namespace nix { // TODO(tazjin): ::expr
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class EvalState;
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struct Value;
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/* Map one attribute name to its value. */
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struct Attr {
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Symbol name;
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Value* value; // TODO(tazjin): Who owns this?
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Pos* pos; // TODO(tazjin): Who owns this?
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Attr(Symbol name, Value* value, Pos* pos = &noPos)
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: name(name), value(value), pos(pos){};
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Attr() : pos(&noPos){};
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bool operator<(const Attr& a) const { return name < a.name; }
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};
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// TODO: remove this, it only exists briefly while I get rid of the
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// current Attr struct
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inline bool operator==(const Attr& lhs, const Attr& rhs) {
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return lhs.name == rhs.name;
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}
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class Bindings {
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public:
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typedef absl::btree_map<Symbol, Attr>::iterator iterator;
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// Return the number of contained elements.
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size_t size();
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// Is this attribute set empty?
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bool empty();
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// TODO(tazjin): rename
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// TODO(tazjin): does this need to copy?
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void push_back(const Attr& attr);
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// Look up a specific element of the attribute set.
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iterator find(const Symbol& name);
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// TODO
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iterator begin();
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iterator end();
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// Merge values from other into the current attribute
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void merge(Bindings* other);
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// ???
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[[deprecated]] void sort();
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// ???
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[[deprecated]] size_t capacity();
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// oh no
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// Attr& operator[](size_t pos); // { return attrs[pos]; }
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// TODO: can callers just iterate?
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[[deprecated]] std::vector<const Attr*> lexicographicOrder();
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// oh no
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friend class EvalState;
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private:
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absl::btree_map<Symbol, Attr> attributes_;
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};
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} // namespace nix
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