178 lines
6.5 KiB
C++
178 lines
6.5 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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#include "library/exception.h"
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#include "library/util.h"
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#include "library/quote.h"
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#include "library/type_context.h"
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namespace lean {
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static std::string * g_expr_quote_opcode = nullptr;
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static expr * g_expr = nullptr;
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static expr * g_pexpr = nullptr;
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static name * g_expr_quote_pre = nullptr;
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static name * g_expr_quote_macro = nullptr;
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/** \brief A compact way of encoding quoted expressions inside Lean expressions. Used for values of type
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`reflected e` and `pexpr`. */
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class expr_quote_macro : public macro_definition_cell {
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expr m_value;
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bool m_reflected;
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public:
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expr_quote_macro(expr const & v, bool reflected):m_value(v), m_reflected(reflected) {}
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virtual bool lt(macro_definition_cell const & d) const override {
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return m_value < static_cast<expr_quote_macro const &>(d).m_value;
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}
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virtual name get_name() const override { return *g_expr_quote_macro; }
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virtual expr check_type(expr const &, abstract_type_context & ctx, bool infer_only) const override {
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if (m_reflected) {
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expr ty = ctx.check(m_value, infer_only);
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return mk_app(mk_constant(get_reflected_name(), {get_level(ctx, ty)}), ty, m_value);
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} else {
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return *g_pexpr;
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}
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}
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virtual optional<expr> expand(expr const &, abstract_type_context &) const override {
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return optional<expr>();
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}
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virtual unsigned trust_level() const override { return 0; }
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virtual bool operator==(macro_definition_cell const & other) const override {
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/* Hack: we do *not* compare m_value's because quoted expressions may contain
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relevant position information that is ignored by the equality predicate for expressions.
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*/
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return this == &other;
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}
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char const * prefix() const {
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return m_reflected ? "`(" : "``(";
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}
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virtual void display(std::ostream & out) const override {
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out << prefix() << m_value << ")";
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}
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virtual unsigned hash() const override { return m_value.hash(); }
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virtual void write(serializer & s) const override { s << *g_expr_quote_opcode << m_value << m_reflected; }
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expr const & get_value() const { return m_value; }
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bool const & is_reflected() const { return m_reflected; }
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};
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expr mk_elaborated_expr_quote(expr const & e) {
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return mk_macro(macro_definition(new expr_quote_macro(e, /* reflected */ true)));
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}
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expr mk_unelaborated_expr_quote(expr const & e) {
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// We use a transparent annotation instead of the opaque macro above so that the quoted term is accessible to
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// collect_locals etc.
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return mk_annotation(*g_expr_quote_pre, e);
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}
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expr mk_pexpr_quote(expr const & e) {
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return mk_macro(macro_definition(new expr_quote_macro(e, /* reflected */ false)));
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}
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bool is_expr_quote(expr const & e) {
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if (is_annotation(e, *g_expr_quote_pre)) {
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return true;
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}
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if (is_macro(e)) {
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if (auto m = dynamic_cast<expr_quote_macro const *>(macro_def(e).raw())) {
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return m->is_reflected();
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}
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}
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return false;
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}
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bool is_pexpr_quote(expr const & e) {
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if (is_macro(e)) {
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if (auto m = dynamic_cast<expr_quote_macro const *>(macro_def(e).raw())) {
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return !m->is_reflected();
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}
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}
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return false;
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}
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expr const & get_expr_quote_value(expr const & e) {
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lean_assert(is_expr_quote(e));
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if (auto m = dynamic_cast<expr_quote_macro const *>(macro_def(e).raw())) {
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return m->get_value();
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} else {
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return get_annotation_arg(e);
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}
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}
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expr const & get_pexpr_quote_value(expr const & e) {
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lean_assert(is_pexpr_quote(e));
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return static_cast<expr_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_pexpr_quote_and_substs(expr const & e, bool is_strict) {
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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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if (is_local(t) && is_strict) {
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throw generic_exception(t, "unexpected local in quotation expression");
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}
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return none_expr();
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});
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expr r = mk_pexpr_quote(Fun(locals, s));
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expr subst = mk_constant(get_expr_subst_name());
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expr to_pexpr = mk_constant(get_to_pexpr_name());
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for (expr const & aq : aqs) {
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r = mk_app(subst, r, mk_app(to_pexpr, 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_expr_quote_macro = new name("expr_quote_macro");
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g_expr_quote_opcode = new std::string("Quote");
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g_expr = new expr(mk_app(Const(get_expr_name()), mk_bool_tt()));
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g_pexpr = new expr(mk_app(Const(get_expr_name()), mk_bool_ff()));
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g_antiquote = new name("antiquote");
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g_expr_quote_pre = new name("expr_quote_pre");
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register_annotation(*g_antiquote);
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register_annotation(*g_expr_quote_pre);
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register_macro_deserializer(*g_expr_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; bool reflected;
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d >> e >> reflected;
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return mk_macro(macro_definition(new expr_quote_macro(e, reflected)));
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});
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}
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void finalize_quote() {
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delete g_expr_quote_pre;
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delete g_expr_quote_macro;
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delete g_expr_quote_opcode;
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delete g_expr;
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delete g_pexpr;
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delete g_antiquote;
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}
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}
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