392 lines
16 KiB
C++
392 lines
16 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 <utility>
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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_prev("prev");
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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 name g_infix("infix");
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static name g_infixl("infixl");
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static name g_infixr("infixr");
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static name g_postfix("postfix");
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static name g_prefix("prefix");
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static name g_notation("notation");
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static name g_call("call");
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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, prefix };
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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::mk_ext_lua_action;
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using notation::transition;
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using notation::action;
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static std::pair<notation_entry, optional<token_entry>> parse_mixfix_notation(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;
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if (p.curr_is_token(g_colon)) {
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p.next();
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prec = parse_precedence(p, "invalid notation declaration, numeral or 'max' expected");
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}
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environment const & env = p.env();
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optional<token_entry> new_token;
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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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new_token = token_entry(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 mk_pair(notation_entry(false, to_list(transition(tks, mk_expr_action(*prec))), mk_app(f, Var(1), Var(0)), overload), new_token);
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case mixfix_kind::infixr:
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return mk_pair(notation_entry(false, to_list(transition(tks, mk_expr_action(*prec-1))), mk_app(f, Var(1), Var(0)), overload), new_token);
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case mixfix_kind::postfix:
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return mk_pair(notation_entry(false, to_list(transition(tks, mk_skip_action())), mk_app(f, Var(0)), overload), new_token);
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case mixfix_kind::prefix:
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return mk_pair(notation_entry(true, to_list(transition(tks, mk_expr_action(*prec))), mk_app(f, Var(0)), overload), new_token);
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}
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lean_unreachable(); // LCOV_EXCL_LINE
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}
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static notation_entry parse_mixfix_notation(parser & p, mixfix_kind k, bool overload, buffer<token_entry> & new_tokens) {
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auto nt = parse_mixfix_notation(p, k, overload);
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if (nt.second)
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new_tokens.push_back(*nt.second);
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return nt.first;
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}
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static environment mixfix_cmd(parser & p, mixfix_kind k, bool overload) {
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auto nt = parse_mixfix_notation(p, k, overload);
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environment env = p.env();
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if (nt.second)
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env = add_token(env, *nt.second);
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env = add_notation(env, nt.first);
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return env;
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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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environment prefix_cmd_core(parser & p, bool overload) { return mixfix_cmd(p, mixfix_kind::prefix, overload); }
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static name parse_quoted_symbol_or_token(parser & p, buffer<token_entry> & new_tokens) {
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if (p.curr_is_quoted_symbol()) {
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environment const & env = p.env();
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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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new_tokens.push_back(token_entry(tkcs, prec));
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} else if (!get_precedence(get_token_table(env), tkcs)) {
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new_tokens.push_back(token_entry(tkcs, 0));
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}
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return tk;
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} else if (p.curr_is_keyword()) {
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auto tk = p.get_token_info().token();
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p.next();
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return tk;
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} else {
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throw parser_error("invalid notation declaration, 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 = mk_Prop(); // 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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unsigned get_precedence(environment const & env, buffer<token_entry> const & new_tokens, name const & token) {
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std::string token_str = token.to_string();
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for (auto const & e : new_tokens) {
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if (e.m_token == token_str)
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return e.m_prec;
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}
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auto prec = get_precedence(get_token_table(env), token_str.c_str());
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if (prec)
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return *prec;
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else
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return 0;
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}
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static action parse_action(parser & p, name const & prev_token, unsigned default_prec, buffer<expr> & locals, buffer<token_entry> & new_tokens) {
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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() || p.curr_is_token_or_id(g_max)) {
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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_prev)) {
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p.next();
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return mk_expr_action(get_precedence(p.env(), new_tokens, prev_token));
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} else if (p.curr_is_string()) {
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std::string fn = p.get_str_val();
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p.next();
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return mk_ext_lua_action(fn.c_str());
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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_or_token(p, new_tokens);
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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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optional<name> terminator;
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if (!p.curr_is_token(g_rparen))
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terminator = parse_quoted_symbol_or_token(p, new_tokens);
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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, terminator, 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 if (p.curr_is_token_or_id(g_call)) {
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p.next();
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name fn = p.check_id_next("invalid call notation argument, identifier expected");
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p.check_token_next(g_rparen, "invalid call notation argument, ')' expected");
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return mk_ext_lua_action(fn.to_string().c_str());
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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(default_prec);
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}
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}
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/**
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\brief If the action for token \c tk in parse table \c pt is an Expr action,
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then return its precedence. We use this value as the default precedence
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when the user does not provide it. The idea is to minimize conflict with existing
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notation.
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*/
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unsigned get_default_prec(optional<parse_table> const & pt, name const & tk) {
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if (!pt)
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return 0;
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if (auto at = pt->find(tk)) {
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if (at->first.kind() == notation::action_kind::Expr)
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return at->first.rbp();
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}
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return 0;
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}
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notation_entry parse_notation_core(parser & p, bool overload, buffer<token_entry> & new_tokens) {
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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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optional<parse_table> pt;
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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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pt = get_led_table(p.env());
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} else {
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pt = get_nud_table(p.env());
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}
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while (!p.curr_is_token(g_assign)) {
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name tk = parse_quoted_symbol_or_token(p, new_tokens);
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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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unsigned default_prec = get_default_prec(pt, tk);
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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, tk, default_prec, locals, new_tokens);
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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 if (p.curr_is_quoted_symbol() || p.curr_is_keyword() || p.curr_is_token(g_assign)) {
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ts.push_back(transition(tk, mk_skip_action()));
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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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if (pt) {
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// new notation is still compatible with the existing one
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transition const & new_trans = ts.back();
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if (auto at = pt->find(new_trans.get_token())) {
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if (new_trans.get_action().is_equal(at->first)) {
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pt = at->second;
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} else {
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// new notation is not compatible with existing one
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pt = optional<parse_table>();
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}
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} else {
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// parse table does not handle this prefix
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pt = optional<parse_table>();
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}
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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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return notation_entry(is_nud, to_list(ts.begin(), ts.end()), n, overload);
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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<token_entry> new_tokens;
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auto ne = parse_notation_core(p, overload, new_tokens);
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for (auto const & te : new_tokens)
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env = add_token(env, te);
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env = add_notation(env, ne);
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return env;
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}
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bool curr_is_notation_decl(parser & p) {
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return p.curr_is_token(g_infix) || p.curr_is_token(g_infixl) || p.curr_is_token(g_infixr) ||
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p.curr_is_token(g_postfix) || p.curr_is_token(g_prefix) || p.curr_is_token(g_notation);
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}
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notation_entry parse_notation(parser & p, bool overload, buffer<token_entry> & new_tokens) {
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if (p.curr_is_token(g_infix) || p.curr_is_token(g_infixl)) {
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p.next();
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return parse_mixfix_notation(p, mixfix_kind::infixl, overload, new_tokens);
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} else if (p.curr_is_token(g_infixr)) {
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p.next();
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return parse_mixfix_notation(p, mixfix_kind::infixr, overload, new_tokens);
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} else if (p.curr_is_token(g_postfix)) {
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p.next();
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return parse_mixfix_notation(p, mixfix_kind::postfix, overload, new_tokens);
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} else if (p.curr_is_token(g_prefix)) {
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p.next();
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return parse_mixfix_notation(p, mixfix_kind::prefix, overload, new_tokens);
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} else if (p.curr_is_token(g_notation)) {
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p.next();
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return parse_notation_core(p, overload, new_tokens);
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} else {
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throw parser_error("invalid notation, 'infix', 'infixl', 'infixr', 'prefix', 'postfix' or 'notation' expected", p.pos());
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}
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}
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environment notation_cmd(parser & p) { return notation_cmd_core(p, true); }
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environment infixl_cmd(parser & p) { return infixl_cmd_core(p, true); }
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environment infixr_cmd(parser & p) { return infixr_cmd_core(p, true); }
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environment postfix_cmd(parser & p) { return postfix_cmd_core(p, true); }
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environment prefix_cmd(parser & p) { return prefix_cmd_core(p, true); }
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void register_notation_cmds(cmd_table & r) {
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add_cmd(r, cmd_info("precedence", "set token left binding power", precedence_cmd));
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add_cmd(r, cmd_info("infixl", "declare a new infix (left) notation", infixl_cmd));
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add_cmd(r, cmd_info("infix", "declare a new infix (left) notation", infixl_cmd));
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add_cmd(r, cmd_info("infixr", "declare a new infix (right) notation", infixr_cmd));
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add_cmd(r, cmd_info("postfix", "declare a new postfix notation", postfix_cmd));
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add_cmd(r, cmd_info("prefix", "declare a new prefix notation", prefix_cmd));
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add_cmd(r, cmd_info("notation", "declare a new notation", notation_cmd));
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}
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}
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