122 lines
4.3 KiB
C++
122 lines
4.3 KiB
C++
/*
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Copyright (c) 2016 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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#include <string>
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#include "util/fresh_name.h"
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#include "kernel/abstract.h"
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#include "kernel/replace_fn.h"
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#include "library/placeholder.h"
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#include "library/constants.h"
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#include "library/annotation.h"
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#include "library/kernel_serializer.h"
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namespace lean {
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static std::string * g_quote_opcode = nullptr;
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static expr * g_qexpr = nullptr;
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static name * g_quote_macro = nullptr;
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/** \brief The quoted expression macro is a compact way of encoding quoted expressions inside Lean expressions. */
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class quote_macro : public macro_definition_cell {
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expr m_value;
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public:
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quote_macro(expr const & v):m_value(v) {}
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virtual bool lt(macro_definition_cell const & d) const {
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return m_value < static_cast<quote_macro const &>(d).m_value;
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}
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virtual name get_name() const { return *g_quote_macro; }
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virtual expr check_type(expr const &, abstract_type_context &, bool) const {
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return *g_qexpr;
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}
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virtual optional<expr> expand(expr const &, abstract_type_context &) const {
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return optional<expr>();
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}
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virtual unsigned trust_level() const { return 0; }
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virtual bool operator==(macro_definition_cell const & other) const {
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quote_macro const * other_ptr = dynamic_cast<quote_macro const *>(&other);
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return other_ptr && m_value == other_ptr->m_value;
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}
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virtual void display(std::ostream & out) const {
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out << "`(" << m_value << ")";
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}
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virtual format pp(formatter const & fmt) const {
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return format("`(") + nest(2, fmt(m_value)) + format(")");
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}
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virtual bool is_atomic_pp(bool, bool) const { return false; }
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virtual unsigned hash() const { return m_value.hash(); }
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virtual void write(serializer & s) const { s << *g_quote_opcode << m_value; }
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expr const & get_value() const { return m_value; }
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};
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expr mk_quote_core(expr const & e) {
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return mk_macro(macro_definition(new quote_macro(e)));
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}
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bool is_quote(expr const & e) {
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return is_macro(e) && dynamic_cast<quote_macro const *>(macro_def(e).raw()) != nullptr;
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}
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expr const & get_quote_expr(expr const & e) {
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lean_assert(is_quote(e));
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return static_cast<quote_macro const *>(macro_def(e).raw())->get_value();
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}
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static name * g_antiquote = nullptr;
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expr mk_antiquote(expr const & e) { return mk_annotation(*g_antiquote, e); }
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bool is_antiquote(expr const & e) { return is_annotation(e, *g_antiquote); }
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expr const & get_antiquote_expr(expr const & e) {
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lean_assert(is_antiquote(e));
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return get_annotation_arg(e);
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}
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expr mk_quote(expr const & e) {
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name x("_x");
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buffer<expr> locals;
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buffer<expr> aqs;
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expr s = replace(e, [&](expr const & t, unsigned) {
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if (is_antiquote(t)) {
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expr local = mk_local(mk_fresh_name(), x.append_after(locals.size() + 1),
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mk_expr_placeholder(), binder_info());
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locals.push_back(local);
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aqs.push_back(get_antiquote_expr(t));
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return some_expr(local);
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}
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return none_expr();
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});
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expr r = mk_quote_core(Fun(locals, s));
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expr subst = mk_constant(get_qexpr_subst_name());
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expr to_qexpr = mk_constant(get_to_qexpr_name());
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for (expr const & aq : aqs) {
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r = mk_app(subst, r, mk_app(to_qexpr, aq));
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}
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return r;
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}
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void initialize_quote() {
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g_quote_macro = new name("quote_macro");
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g_quote_opcode = new std::string("Quote");
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g_qexpr = new expr(Const(get_qexpr_name()));
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g_antiquote = new name("antiquote");
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register_annotation(*g_antiquote);
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register_macro_deserializer(*g_quote_opcode,
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[](deserializer & d, unsigned num, expr const *) {
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if (num != 0)
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throw corrupted_stream_exception();
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expr e;
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d >> e;
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return mk_quote_core(e);
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});
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}
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void finalize_quote() {
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delete g_quote_macro;
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delete g_quote_opcode;
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delete g_qexpr;
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delete g_antiquote;
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}
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}
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