64 lines
2.1 KiB
C++
64 lines
2.1 KiB
C++
/*
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Copyright (c) 2014 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#pragma once
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#include "util/rb_map.h"
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#include "util/list.h"
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#include "kernel/expr.h"
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namespace lean {
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struct head_index {
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expr_kind m_kind;
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name m_const_name;
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explicit head_index(expr_kind k = expr_kind::Var):m_kind(k) {}
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explicit head_index(name const & c):m_kind(expr_kind::Constant), m_const_name(c) {}
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head_index(expr const & e);
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struct cmp {
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int operator()(head_index const & i1, head_index const & i2) const;
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};
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};
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/**
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\brief Very simple indexing data-structure that allow us to map the head symbol of an expression to
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a list of values.
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The index is the expression kind and a name (if it is a constant).
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This index is very naive, but it is effective for many applications.
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*/
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template<typename V>
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class head_map {
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rb_map<head_index, list<V>, head_index::cmp> m_map;
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public:
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bool empty() const { return m_map.empty(); }
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bool contains(head_index const & h) const { return m_map.contains(h); }
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list<V> const * find(head_index const & h) const { return m_map.find(h); }
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void erase(head_index const & h) { m_map.erase(h); }
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void erase_entry(head_index const & h, V const & v) {
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if (auto it = m_map.find(h)) {
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auto new_vs = filter(*it, [&](V const & v2) { return v != v2; });
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if (!new_vs)
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m_map.erase(h);
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else
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m_map.insert(h, new_vs);
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}
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}
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void insert(head_index const & h, V const & v) {
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if (auto it = m_map.find(h))
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m_map.insert(h, cons(v, filter(*it, [&](V const & v2) { return v != v2; })));
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else
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m_map.insert(h, to_list(v));
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}
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template<typename F> void for_each(F && f) const { m_map.for_each(f); }
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template<typename F> void for_each_entry(F && f) const {
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m_map.for_each([&](head_index const & h, list<V> const & vs) {
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for (V const & v : vs)
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f(h, v);
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});
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}
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};
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}
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