143 lines
6.5 KiB
C++
143 lines
6.5 KiB
C++
/*
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Copyright (c) 2013 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 "kernel/unification_constraint.h"
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namespace lean {
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unification_constraint_cell::unification_constraint_cell(unification_constraint_kind k, context const & c, justification const & j):
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m_kind(k), m_ctx(c), m_justification(j), m_rc(1) {
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}
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unification_constraint_cell::~unification_constraint_cell() {
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}
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void unification_constraint_cell::dealloc() {
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delete this;
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}
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static format add_context(formatter const & fmt, options const & opts, context const & ctx, format const & body) {
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bool unicode = get_pp_unicode(opts);
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format ctx_fmt = fmt(ctx, opts);
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format turnstile = unicode ? format("\u22A2") /* ⊢ */ : format("|-");
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return group(format{ctx_fmt, space(), turnstile, line(), body});
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}
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static format add_justification(formatter const & fmt, options const & opts, format const & body, justification const & jst, pos_info_provider const * p, bool include_justification) {
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if (jst && include_justification) {
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unsigned indent = get_pp_indent(opts);
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return format{body, line(), format("Justification:"), nest(indent, compose(line(), jst.pp(fmt, opts, p)))};
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} else {
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return body;
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}
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}
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static format mk_binary(formatter const & fmt, options const & opts, context const & ctx, expr const & lhs, expr const & rhs, format const & op) {
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format lhs_fmt = fmt(ctx, lhs, false, opts);
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format rhs_fmt = fmt(ctx, rhs, false, opts);
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return group(format{lhs_fmt, space(), op, line(), rhs_fmt});
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}
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static format mk_unification_op(options const & opts) {
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bool unicode = get_pp_unicode(opts);
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return unicode ? format("\u2248") /* ≈ */ : format("=?=");
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}
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unification_constraint_eq::unification_constraint_eq(context const & c, expr const & lhs, expr const & rhs, justification const & j):
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unification_constraint_cell(unification_constraint_kind::Eq, c, j),
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m_lhs(lhs),
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m_rhs(rhs) {
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}
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unification_constraint_eq::~unification_constraint_eq() {
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}
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format unification_constraint_eq::pp(formatter const & fmt, options const & opts, pos_info_provider const * p, bool include_justification) const {
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format op = mk_unification_op(opts);
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format body = mk_binary(fmt, opts, m_ctx, m_lhs, m_rhs, op);
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body = add_context(fmt, opts, m_ctx, body);
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return add_justification(fmt, opts, body, m_justification, p, include_justification);
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}
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unification_constraint_convertible::unification_constraint_convertible(context const & c, expr const & from, expr const & to, justification const & j):
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unification_constraint_cell(unification_constraint_kind::Convertible, c, j),
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m_from(from),
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m_to(to) {
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}
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unification_constraint_convertible::~unification_constraint_convertible() {
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}
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format unification_constraint_convertible::pp(formatter const & fmt, options const & opts, pos_info_provider const * p, bool include_justification) const {
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bool unicode = get_pp_unicode(opts);
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format op = unicode ? format("\u227A") /* ≺ */ : format("<<");
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format body = mk_binary(fmt, opts, m_ctx, m_from, m_to, op);
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body = add_context(fmt, opts, m_ctx, body);
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return add_justification(fmt, opts, body, m_justification, p, include_justification);
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}
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unification_constraint_max::unification_constraint_max(context const & c, expr const & lhs1, expr const & lhs2, expr const & rhs, justification const & j):
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unification_constraint_cell(unification_constraint_kind::Max, c, j),
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m_lhs1(lhs1),
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m_lhs2(lhs2),
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m_rhs(rhs) {
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}
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unification_constraint_max::~unification_constraint_max() {
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}
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format unification_constraint_max::pp(formatter const & fmt, options const & opts, pos_info_provider const * p, bool include_justification) const {
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format op = mk_unification_op(opts);
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format lhs1_fmt = fmt(m_ctx, m_lhs1, false, opts);
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format lhs2_fmt = fmt(m_ctx, m_lhs2, false, opts);
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format rhs_fmt = fmt(m_ctx, m_rhs, false, opts);
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format body = group(format{format("max"), lp(), lhs1_fmt, comma(), nest(4, compose(line(), lhs2_fmt)), rp(), space(), op, line(), rhs_fmt});
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body = add_context(fmt, opts, m_ctx, body);
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return add_justification(fmt, opts, body, m_justification, p, include_justification);
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}
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unification_constraint_choice::unification_constraint_choice(context const & c, expr const & mvar, unsigned num, expr const * choices, justification const & j):
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unification_constraint_cell(unification_constraint_kind::Choice, c, j),
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m_mvar(mvar),
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m_choices(choices, choices + num) {
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}
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unification_constraint_choice::~unification_constraint_choice() {
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}
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format unification_constraint_choice::pp(formatter const & fmt, options const & opts, pos_info_provider const * p, bool include_justification) const {
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bool unicode = get_pp_unicode(opts);
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format m_fmt = fmt(m_ctx, m_mvar, false, opts);
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format eq_op = mk_unification_op(opts);
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format or_op = unicode ? format("\u2295") : format("OR");
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format body;
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for (unsigned i = 0; i < m_choices.size(); i++) {
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body += group(paren(format{m_fmt, space(), eq_op, compose(line(), fmt(m_ctx, m_choices[i], false, opts))}));
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if (i + 1 < m_choices.size())
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body += format{space(), or_op, line()};
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}
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body = group(body);
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body = add_context(fmt, opts, m_ctx, body);
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return add_justification(fmt, opts, body, m_justification, p, include_justification);
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}
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unification_constraint mk_eq_constraint(context const & c, expr const & lhs, expr const & rhs, justification const & j) {
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return unification_constraint(new unification_constraint_eq(c, lhs, rhs, j));
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}
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unification_constraint mk_convertible_constraint(context const & c, expr const & from, expr const & to, justification const & j) {
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return unification_constraint(new unification_constraint_convertible(c, from, to, j));
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}
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unification_constraint mk_max_constraint(context const & c, expr const & lhs1, expr const & lhs2, expr const & rhs, justification const & j) {
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return unification_constraint(new unification_constraint_max(c, lhs1, lhs2, rhs, j));
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}
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unification_constraint mk_choice_constraint(context const & c, expr const & mvar, unsigned num, expr const * choices, justification const & j) {
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return unification_constraint(new unification_constraint_choice(c, mvar, num, choices, j));
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}
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unification_constraint mk_choice_constraint(context const & c, expr const & mvar, std::initializer_list<expr> const & choices, justification const & j) {
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return mk_choice_constraint(c, mvar, choices.size(), choices.begin(), j);
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}
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}
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