241 lines
9.6 KiB
C++
241 lines
9.6 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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#include <limits>
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#include <string>
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#include "kernel/abstract.h"
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#include "frontends/lean/parser.h"
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namespace lean {
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static name g_max("max");
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static name g_colon(":");
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static name g_comma(",");
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static name g_assign(":=");
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static name g_lparen("(");
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static name g_rparen(")");
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static name g_scoped("scoped");
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static name g_foldr("foldr");
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static name g_foldl("foldl");
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static name g_binder("binder");
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static name g_binders("binders");
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static std::string parse_symbol(parser & p, char const * msg) {
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name n;
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if (p.curr_is_identifier() || p.curr_is_quoted_symbol()) {
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n = p.get_name_val();
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} else if (p.curr_is_keyword()) {
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n = p.get_token_info().value();
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} else {
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throw parser_error(msg, p.pos());
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}
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p.next();
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return n.to_string();
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}
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static optional<unsigned> parse_optional_precedence(parser & p) {
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if (p.curr_is_numeral()) {
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return optional<unsigned>(p.parse_small_nat());
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} else if (p.curr_is_token_or_id(g_max)) {
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p.next();
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return optional<unsigned>(std::numeric_limits<unsigned>::max());
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} else {
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return optional<unsigned>();
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}
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}
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static unsigned parse_precedence(parser & p, char const * msg) {
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auto r = parse_optional_precedence(p);
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if (!r)
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throw parser_error(msg, p.pos());
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return *r;
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}
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environment precedence_cmd(parser & p) {
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std::string tk = parse_symbol(p, "invalid precedence declaration, quoted symbol or identifier expected");
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p.check_token_next(g_colon, "invalid precedence declaration, ':' expected");
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unsigned prec = parse_precedence(p, "invalid precedence declaration, numeral or 'max' expected");
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return add_token(p.env(), tk.c_str(), prec);
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}
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enum class mixfix_kind { infixl, infixr, postfix };
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using notation::mk_expr_action;
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using notation::mk_binder_action;
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using notation::mk_binders_action;
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using notation::mk_exprs_action;
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using notation::mk_scoped_expr_action;
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using notation::mk_skip_action;
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using notation::transition;
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using notation::action;
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static environment mixfix_cmd(parser & p, mixfix_kind k, bool overload) {
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std::string tk = parse_symbol(p, "invalid notation declaration, quoted symbol or identifier expected");
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optional<unsigned> prec = parse_optional_precedence(p);
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environment env = p.env();
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if (!prec) {
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prec = get_precedence(get_token_table(env), tk.c_str());
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} else if (prec != get_precedence(get_token_table(env), tk.c_str())) {
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env = add_token(env, tk.c_str(), *prec);
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}
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if (!prec)
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throw parser_error("invalid notation declaration, precedence was not provided, and it is not set for the given symbol, "
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"solution: use the 'precedence' command", p.pos());
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if (k == mixfix_kind::infixr && *prec == 0)
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throw parser_error("invalid infixr declaration, precedence must be greater than zero", p.pos());
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p.check_token_next(g_assign, "invalid notation declaration, ':=' expected");
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expr f = p.parse_expr();
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char const * tks = tk.c_str();
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switch (k) {
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case mixfix_kind::infixl:
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return add_led_notation(env, {transition(tks, mk_expr_action(*prec))}, mk_app(f, Var(1), Var(0)), overload);
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case mixfix_kind::infixr:
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return add_led_notation(env, {transition(tks, mk_expr_action(*prec-1))}, mk_app(f, Var(1), Var(0)), overload);
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case mixfix_kind::postfix:
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return add_led_notation(env, {transition(tks, mk_skip_action())}, mk_app(f, Var(0)), overload);
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}
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lean_unreachable(); // LCOV_EXCL_LINE
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}
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environment infixl_cmd_core(parser & p, bool overload) { return mixfix_cmd(p, mixfix_kind::infixl, overload); }
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environment infixr_cmd_core(parser & p, bool overload) { return mixfix_cmd(p, mixfix_kind::infixr, overload); }
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environment postfix_cmd_core(parser & p, bool overload) { return mixfix_cmd(p, mixfix_kind::postfix, overload); }
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static name parse_quoted_symbol(parser & p, environment & env) {
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if (p.curr_is_quoted_symbol()) {
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auto tk = p.get_name_val();
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auto tks = tk.to_string();
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auto tkcs = tks.c_str();
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p.next();
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if (p.curr_is_token(g_colon)) {
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p.next();
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unsigned prec = parse_precedence(p, "invalid notation declaration, precedence (small numeral) expected");
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auto old_prec = get_precedence(get_token_table(env), tkcs);
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if (!old_prec || prec != *old_prec)
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env = add_token(env, tkcs, prec);
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} else if (!get_precedence(get_token_table(env), tkcs)) {
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env = add_token(env, tkcs, 0);
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}
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return tk;
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} else {
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throw parser_error("invalid notation declaration, quoted symbol expected", p.pos());
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}
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}
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static expr parse_notation_expr(parser & p, buffer<expr> const & locals) {
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expr r = p.parse_expr();
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return abstract(r, locals.size(), locals.data());
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}
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static expr g_local_type = Bool; // type used in notation local declarations, it is irrelevant
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static void parse_notation_local(parser & p, buffer<expr> & locals) {
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if (p.curr_is_identifier()) {
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name n = p.get_name_val();
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p.next();
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expr l = mk_local(n, g_local_type); // remark: the type doesn't matter
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p.add_local_expr(n, l);
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locals.push_back(l);
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} else {
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throw parser_error("invalid notation declaration, identifier expected", p.pos());
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}
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}
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static action parse_action(parser & p, environment & env, buffer<expr> & locals) {
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if (p.curr_is_token(g_colon)) {
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p.next();
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if (p.curr_is_numeral()) {
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unsigned prec = parse_precedence(p, "invalid notation declaration, small numeral expected");
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return mk_expr_action(prec);
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} else if (p.curr_is_token_or_id(g_scoped)) {
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p.next();
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return mk_scoped_expr_action(mk_var(0));
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} else {
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p.check_token_next(g_lparen, "invalid notation declaration, '(', numeral or 'scoped' expected");
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if (p.curr_is_token_or_id(g_foldl) || p.curr_is_token_or_id(g_foldr)) {
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bool is_fold_right = p.curr_is_token_or_id(g_foldr);
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p.next();
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auto prec = parse_optional_precedence(p);
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name sep = parse_quoted_symbol(p, env);
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expr rec;
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{
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parser::local_scope scope(p);
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p.check_token_next(g_lparen, "invalid fold notation argument, '(' expected");
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parse_notation_local(p, locals);
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parse_notation_local(p, locals);
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p.check_token_next(g_comma, "invalid fold notation argument, ',' expected");
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rec = parse_notation_expr(p, locals);
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p.check_token_next(g_rparen, "invalid fold notation argument, ')' expected");
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locals.pop_back();
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locals.pop_back();
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}
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expr ini = parse_notation_expr(p, locals);
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p.check_token_next(g_rparen, "invalid fold notation argument, ')' expected");
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return mk_exprs_action(sep, rec, ini, is_fold_right, prec ? *prec : 0);
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} else if (p.curr_is_token_or_id(g_scoped)) {
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p.next();
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auto prec = parse_optional_precedence(p);
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expr rec;
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{
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parser::local_scope scope(p);
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parse_notation_local(p, locals);
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p.check_token_next(g_comma, "invalid scoped notation argument, ',' expected");
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rec = parse_notation_expr(p, locals);
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locals.pop_back();
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}
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p.check_token_next(g_rparen, "invalid scoped notation argument, ')' expected");
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return mk_scoped_expr_action(rec, prec ? *prec : 0);
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} else {
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throw parser_error("invalid notation declaration, 'foldl', 'foldr' or 'scoped' expected", p.pos());
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}
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}
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} else {
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return mk_expr_action();
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}
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}
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environment notation_cmd_core(parser & p, bool overload) {
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environment env = p.env();
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buffer<expr> locals;
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buffer<transition> ts;
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parser::local_scope scope(p);
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bool is_nud = true;
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if (p.curr_is_identifier()) {
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parse_notation_local(p, locals);
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is_nud = false;
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}
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while (!p.curr_is_token(g_assign)) {
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name tk = parse_quoted_symbol(p, env);
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if (p.curr_is_quoted_symbol() || p.curr_is_token(g_assign)) {
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ts.push_back(transition(tk, mk_skip_action()));
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} else if (p.curr_is_token_or_id(g_binder)) {
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p.next();
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ts.push_back(transition(tk, mk_binder_action()));
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} else if (p.curr_is_token_or_id(g_binders)) {
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p.next();
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ts.push_back(transition(tk, mk_binders_action()));
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} else if (p.curr_is_identifier()) {
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name n = p.get_name_val();
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p.next();
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action a = parse_action(p, env, locals);
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expr l = mk_local(n, g_local_type);
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p.add_local_expr(n, l);
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locals.push_back(l);
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ts.push_back(transition(tk, a));
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} else {
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throw parser_error("invalid notation declaration, quoted-symbol, identifier, 'binder', 'binders' expected", p.pos());
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}
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}
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p.next();
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if (ts.empty())
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throw parser_error("invalid notation declaration, empty notation is not allowed", p.pos());
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expr n = parse_notation_expr(p, locals);
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if (is_nud)
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return add_nud_notation(env, ts.size(), ts.data(), n, overload);
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else
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return add_led_notation(env, ts.size(), ts.data(), n, overload);
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}
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}
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