1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137

// This file is part of yash, an extended POSIX shell.
// Copyright (C) 2020 WATANABE Yuki
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

//! Syntax parser for and-or list

use super::core::Parser;
use super::core::Rec;
use super::core::Result;
use super::error::Error;
use super::error::SyntaxError;
use super::fill::MissingHereDoc;
use super::lex::Operator::{AndAnd, BarBar};
use super::lex::TokenId::Operator;
use crate::syntax::AndOr;
use crate::syntax::AndOrList;

impl Parser<'_, '_> {
    /// Parses an and-or list.
    ///
    /// If there is no valid and-or list at the current position, this function
    /// returns `Ok(Rec::Parsed(None))`.
    pub async fn and_or_list(&mut self) -> Result<Rec<Option<AndOrList<MissingHereDoc>>>> {
        let first = match self.pipeline().await? {
            Rec::AliasSubstituted => return Ok(Rec::AliasSubstituted),
            Rec::Parsed(None) => return Ok(Rec::Parsed(None)),
            Rec::Parsed(Some(p)) => p,
        };

        let mut rest = vec![];
        loop {
            let condition = match self.peek_token().await?.id {
                Operator(AndAnd) => AndOr::AndThen,
                Operator(BarBar) => AndOr::OrElse,
                _ => break,
            };
            self.take_token_raw().await?;

            while self.newline_and_here_doc_contents().await? {}

            let maybe_pipeline = loop {
                if let Rec::Parsed(maybe_pipeline) = self.pipeline().await? {
                    break maybe_pipeline;
                }
            };
            let pipeline = match maybe_pipeline {
                None => {
                    let cause = SyntaxError::MissingPipeline(condition).into();
                    let location = self.peek_token().await?.word.location.clone();
                    return Err(Error { cause, location });
                }
                Some(pipeline) => pipeline,
            };

            rest.push((condition, pipeline));
        }

        Ok(Rec::Parsed(Some(AndOrList { first, rest })))
    }
}

#[cfg(test)]
mod tests {
    use super::super::error::ErrorCause;
    use super::super::fill::Fill;
    use super::super::lex::Lexer;
    use super::*;
    use crate::source::Source;
    use futures_executor::block_on;

    #[test]
    fn parser_and_or_list_eof() {
        let mut lexer = Lexer::from_memory("", Source::Unknown);
        let aliases = Default::default();
        let mut parser = Parser::new(&mut lexer, &aliases);

        let option = block_on(parser.and_or_list()).unwrap().unwrap();
        assert_eq!(option, None);
    }

    #[test]
    fn parser_and_or_list_one() {
        let mut lexer = Lexer::from_memory("foo", Source::Unknown);
        let aliases = Default::default();
        let mut parser = Parser::new(&mut lexer, &aliases);

        let aol = block_on(parser.and_or_list()).unwrap().unwrap().unwrap();
        let aol = aol.fill(&mut std::iter::empty()).unwrap();
        assert_eq!(aol.first.to_string(), "foo");
        assert_eq!(aol.rest, vec![]);
    }

    #[test]
    fn parser_and_or_list_many() {
        let mut lexer = Lexer::from_memory("first && second || \n\n third;", Source::Unknown);
        let aliases = Default::default();
        let mut parser = Parser::new(&mut lexer, &aliases);

        let aol = block_on(parser.and_or_list()).unwrap().unwrap().unwrap();
        let aol = aol.fill(&mut std::iter::empty()).unwrap();
        assert_eq!(aol.first.to_string(), "first");
        assert_eq!(aol.rest.len(), 2);
        assert_eq!(aol.rest[0].0, AndOr::AndThen);
        assert_eq!(aol.rest[0].1.to_string(), "second");
        assert_eq!(aol.rest[1].0, AndOr::OrElse);
        assert_eq!(aol.rest[1].1.to_string(), "third");
    }

    #[test]
    fn parser_and_or_list_missing_command_after_and_and() {
        let mut lexer = Lexer::from_memory("foo &&", Source::Unknown);
        let aliases = Default::default();
        let mut parser = Parser::new(&mut lexer, &aliases);

        let e = block_on(parser.and_or_list()).unwrap_err();
        assert_eq!(
            e.cause,
            ErrorCause::Syntax(SyntaxError::MissingPipeline(AndOr::AndThen))
        );
        assert_eq!(*e.location.code.value.borrow(), "foo &&");
        assert_eq!(e.location.code.start_line_number.get(), 1);
        assert_eq!(e.location.code.source, Source::Unknown);
        assert_eq!(e.location.index, 6);
    }
}