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

use nom::branch::alt;
use nom::bytes::complete::{tag, take_till, take_until, take_while};
use nom::character::complete::{char as cchar, multispace1, one_of, satisfy};
use nom::combinator::{map, opt, recognize};
use nom::multi::many1;
use nom::sequence::{delimited, preceded, tuple};
use nom::IResult;

use crate::Parser;

// Literal         ::=  ('"' [^"]* '"') | ("'" [^']* "'")
#[derive(derive_newtype::NewType, Eq, PartialEq, Debug, Clone)]
pub struct Literal<'a>(&'a str);

impl<'a> Parser<'a> for Literal<'a> {
    fn parse(input: &'a str) -> IResult<&'a str, Self> {
        map(
            alt((
                delimited(cchar('"'), take_until("\""), cchar('"')),
                delimited(cchar('\''), take_until("'"), cchar('\'')),
            )),
            Self,
        )(input)
    }
}

// Identifier      ::=  ( Letter | '_' ) ( Letter | Digit | '.' | '_' )*
#[derive(derive_newtype::NewType, Eq, PartialEq, Debug, Clone)]
pub struct Identifier<'a>(&'a str);

impl<'a> Parser<'a> for Identifier<'a> {
    fn parse(input: &'a str) -> IResult<&'a str, Self> {
        map(
            recognize(tuple((
                opt(cchar('_')),
                satisfy(|c| c.is_ascii_alphabetic()),
                take_while(|c: char| c.is_ascii_alphanumeric() || c == '.' || c == '_'),
            ))),
            Self,
        )(input)
    }
}

// ListSeparator   ::=  ',' | ';'
#[derive(Eq, PartialEq, Debug, Copy, Clone)]
pub struct ListSeparator;

impl<'a> Parser<'a> for ListSeparator {
    fn parse(input: &'a str) -> IResult<&'a str, Self> {
        map(one_of(",;"), |_: char| Self)(input)
    }
}

// 1. The line begins with // or #
// 2. The content between /* and */
#[derive(Eq, PartialEq, Debug, Clone)]
pub struct Comment<'a>(&'a str);

impl<'a> Parser<'a> for Comment<'a> {
    fn parse(input: &'a str) -> IResult<&'a str, Self> {
        map(
            alt((
                preceded(tag("//"), take_till(|c| c == '\n')),
                preceded(cchar('#'), take_till(|c| c == '\n')),
                delimited(tag("/*"), take_until("*/"), tag("*/")),
            )),
            Self,
        )(input)
    }
}

// 1. Comment
// 2. Space
#[derive(Eq, PartialEq, Debug, Copy, Clone)]
pub struct Separator;

impl<'a> Parser<'a> for Separator {
    fn parse(input: &'a str) -> IResult<&'a str, Self> {
        map(
            many1(alt((map(Comment::parse, |_| ()), map(multispace1, |_| ())))),
            |_| Self,
        )(input)
    }
}

#[cfg(test)]
mod test {
    use super::*;
    use crate::utils::*;

    #[test]
    fn test_literal() {
        assert_list_eq_with_f(
            vec![
                "'ihciah'balabala",
                "'ihcia\"h'''''",
                "\"ihciah\"balabala",
                "\"ihcia'h\"''''",
            ],
            vec!["ihciah", "ihcia\"h", "ihciah", "ihcia'h"],
            Literal::parse,
            Literal,
        );
        assert_list_err_with_f(vec!["'ihcia\"aa"], Literal::parse);
    }

    #[test]
    fn test_identifier() {
        assert_list_eq_with_f(
            vec!["_ihc123iah,", "ihc123iah,"],
            vec!["_ihc123iah", "ihc123iah"],
            Identifier::parse,
            Identifier,
        );
        assert_list_err_with_f(vec!["_123", "_", "123"], Identifier::parse);
    }

    #[test]
    fn test_list_separator() {
        assert!(ListSeparator::parse(";").is_ok());
        assert!(ListSeparator::parse(",").is_ok());
        assert!(ListSeparator::parse("a").is_err());
    }
    #[test]
    fn test_comment() {
        assert_list_eq_with_f(
            vec!["//ihciah's #content", "//ihciah's #content balabala\nNextLine", "#ihciah's ///#content", "/*ihciah's con@#tent*///aaa"],
            vec!["ihciah's #content", "ihciah's #content balabala", "ihciah's ///#content", "ihciah's con@#tent"],
            Comment::parse,
            Comment,
        );
    }
}