michael/lean2
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

refactor(frontends/lean/elaborator): remove unnecessary

Browse source 
set_local_context_for method
This commit is contained in:
Leonardo de Moura 2014-09-25 10:21:31 -07:00
parent b8eb65aac2
commit 8747f12118
1 changed files with 23 additions and 30 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

53
src/frontends/lean/elaborator.cpp
View file

@ -99,22 +99,6 @@ class elaborator : public coercion_info_manager {
info_manager m_pre_info_data;
unifier_config m_unifier_config;
/** \brief Set local context for the given metavariable application */
void set_local_context_for(expr const & meta) {
lean_assert(is_meta(meta));
buffer<expr> args;
get_app_args(meta, args);
list<expr> ctx, full_ctx;
for (expr const & arg : args) {
lean_assert(is_local(arg));
if (local_info(arg).is_contextual())
ctx = cons(arg, ctx);
full_ctx = cons(arg, full_ctx);
}
m_context.set_ctx(ctx);
m_full_context.set_ctx(full_ctx);
}
/** \brief 'Choice' expressions <tt>(choice e_1 ... e_n)</tt> are mapped into a metavariable \c ?m
and a choice constraints <tt>(?m in fn)</tt> where \c fn is a choice function.
The choice function produces a stream of alternatives. In this case, it produces a stream of
@ -122,13 +106,16 @@ class elaborator : public coercion_info_manager {
This is a helper class for implementing this choice functions.
*/
struct choice_expr_elaborator : public choice_iterator {
elaborator & m_elab;
expr m_meta;
expr m_choice;
unsigned m_idx;
bool m_relax_main_opaque;
choice_expr_elaborator(elaborator & elab, expr const & meta, expr const & c, bool relax):
m_elab(elab), m_meta(meta), m_choice(c),
elaborator & m_elab;
local_context m_context;
local_context m_full_context;
expr m_meta;
expr m_choice;
unsigned m_idx;
bool m_relax_main_opaque;
choice_expr_elaborator(elaborator & elab, local_context const & ctx, local_context const & full_ctx,
expr const & meta, expr const & c, bool relax):
m_elab(elab), m_context(ctx), m_full_context(full_ctx), m_meta(meta), m_choice(c),
m_idx(get_num_choices(m_choice)),
m_relax_main_opaque(relax) {
}
@ -140,7 +127,8 @@ class elaborator : public coercion_info_manager {
expr const & f = get_app_fn(c);
m_elab.save_identifier_info(f);
try {
m_elab.set_local_context_for(m_meta);
flet<local_context> set1(m_elab.m_context, m_context);
flet<local_context> set2(m_elab.m_full_context, m_full_context);
pair<expr, constraint_seq> rcs = m_elab.visit(c);
expr r = rcs.first;
constraint_seq cs = mk_eq_cnstr(m_meta, r, justification(), m_relax_main_opaque) + rcs.second;
@ -311,12 +299,14 @@ public:
expr visit_choice(expr const & e, optional<expr> const & t, constraint_seq & cs) {
lean_assert(is_choice(e));
// Possible optimization: try to lookahead and discard some of the alternatives.
expr m = m_full_context.mk_meta(m_ngen, t, e.get_tag());
expr m = m_full_context.mk_meta(m_ngen, t, e.get_tag());
register_meta(m);
bool relax = m_relax_main_opaque;
bool relax = m_relax_main_opaque;
local_context ctx = m_context;
local_context full_ctx = m_full_context;
auto fn = [=](expr const & meta, expr const & /* type */, substitution const & /* s */,
name_generator const & /* ngen */) {
return choose(std::make_shared<choice_expr_elaborator>(*this, meta, e, relax));
return choose(std::make_shared<choice_expr_elaborator>(*this, ctx, full_ctx, meta, e, relax));
};
justification j = mk_justification("none of the overloads is applicable", some_expr(e));
cs += mk_choice_cnstr(m, fn, to_delay_factor(cnstr_group::Basic), true, j, m_relax_main_opaque);
@ -405,12 +395,15 @@ public:
save_coercion_info(old_f, f);
lean_assert(is_pi(f_type));
} else {
bool relax = m_relax_main_opaque;
justification j = mk_justification(f, [=](formatter const & fmt, substitution const & subst) {
bool relax = m_relax_main_opaque;
local_context ctx = m_context;
local_context full_ctx = m_full_context;
justification j = mk_justification(f, [=](formatter const & fmt, substitution const & subst) {
return pp_function_expected(fmt, substitution(subst).instantiate(f));
});
auto choice_fn = [=](expr const & meta, expr const &, substitution const &, name_generator const &) {
set_local_context_for(meta);
flet<local_context> save1(m_context, ctx);
flet<local_context> save2(m_full_context, full_ctx);
list<constraints> choices = map2<constraints>(coes, [&](expr const & coe) {
expr new_f = copy_tag(f, ::lean::mk_app(coe, f));
constraint_seq cs;