126 lines
3.5 KiB
Rust
126 lines
3.5 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Parsing pipes protocols from token trees.
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use ast_util;
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use ext::pipes::proto::*;
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use parse::common::SeqSep;
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use parse::parser;
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use parse::token;
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use core::prelude::*;
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pub trait proto_parser {
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fn parse_proto(&self, +id: ~str) -> protocol;
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fn parse_state(&self, proto: protocol);
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fn parse_message(&self, state: state);
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}
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impl proto_parser for parser::Parser {
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fn parse_proto(&self, +id: ~str) -> protocol {
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let proto = protocol(id, *self.span);
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self.parse_seq_to_before_end(
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&token::EOF,
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SeqSep {
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sep: None,
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trailing_sep_allowed: false,
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},
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|self| self.parse_state(proto)
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);
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return proto;
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}
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fn parse_state(&self, proto: protocol) {
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let id = self.parse_ident();
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let name = copy *self.interner.get(id);
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self.expect(&token::COLON);
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let dir = match copy *self.token {
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token::IDENT(n, _) => self.interner.get(n),
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_ => fail!()
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};
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self.bump();
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let dir = match dir {
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@~"send" => send,
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@~"recv" => recv,
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_ => fail!()
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};
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let generics = if *self.token == token::LT {
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self.parse_generics()
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} else {
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ast_util::empty_generics()
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};
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let state = proto.add_state_poly(name, id, dir, generics);
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// parse the messages
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self.parse_unspanned_seq(
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&token::LBRACE,
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&token::RBRACE,
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SeqSep {
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sep: Some(token::COMMA),
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trailing_sep_allowed: true,
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},
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|self| self.parse_message(state)
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);
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}
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fn parse_message(&self, state: state) {
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let mname = copy *self.interner.get(self.parse_ident());
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let args = if *self.token == token::LPAREN {
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self.parse_unspanned_seq(
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&token::LPAREN,
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&token::RPAREN,
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SeqSep {
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sep: Some(token::COMMA),
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trailing_sep_allowed: true,
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},
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|p| p.parse_ty(false)
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)
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}
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else { ~[] };
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self.expect(&token::RARROW);
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let next = match *self.token {
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token::IDENT(_, _) => {
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let name = copy *self.interner.get(self.parse_ident());
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let ntys = if *self.token == token::LT {
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self.parse_unspanned_seq(
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&token::LT,
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&token::GT,
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SeqSep {
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sep: Some(token::COMMA),
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trailing_sep_allowed: true,
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},
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|p| p.parse_ty(false)
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)
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}
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else { ~[] };
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Some(next_state {state: name, tys: ntys})
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}
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token::NOT => {
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// -> !
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self.bump();
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None
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}
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_ => self.fatal(~"invalid next state")
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};
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state.add_message(mname, *self.span, args, next);
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}
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}
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