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

use crate::tuple::PartThen;
use bogobble::*;
use std::fmt::Display;
use std::marker::PhantomData;

pub type SSRes<'a> = Result<(PIter<'a>, Option<PErr<'a>>), PErr<'a>>;

pub trait SSErr<'a>: Sized {
    fn join_err(self, e2: PErr<'a>) -> Self;
    fn join_err_op(self, e: Option<PErr<'a>>) -> Self {
        match e {
            Some(e) => self.join_err(e),
            None => self,
        }
    }
    fn put(self, res: &mut String, it: &PIter) -> Self;
}

pub trait BackTo {
    fn back(&self, _: usize) {}
}

impl BackTo for () {}

impl<'a> SSErr<'a> for SSRes<'a> {
    fn join_err(self, e2: PErr<'a>) -> Self {
        self.map_err(|e| e.join(e2))
    }
    fn put(self, res: &mut String, it: &PIter) -> Self {
        if let Ok((i, _)) = &self {
            res.push_str(it.str_to(i.index()));
        }
        self
    }
}

pub trait SSParser<CF: BackTo>: Sized {
    fn ss_parse<'a>(&self, i: &PIter<'a>, res: &mut String, _: &CF) -> SSRes<'a>;

    fn ss_convert<'a>(&self, s: &'a str, cf: &CF) -> Result<String, PErr<'a>> {
        let mut res = String::new();
        let it = PIter::new(s);
        match self.ss_parse(&it, &mut res, cf) {
            Ok(_) => Ok(res),
            Err(e) => Err(e),
        }
    }
}

pub trait SSOrer: Sized {
    fn ss_or<B>(self, b: B) -> SSOR<Self, B> {
        SSOR(self, b)
    }
    fn p_then<B>(self, b: B) -> PartThen<Self, B> {
        PartThen(self, b)
    }
}

impl<T: Sized> SSOrer for T {}

pub struct SS<P: OParser<T>, T>(P, PhantomData<T>);

pub fn ss<P: OParser<T>, T>(p: P) -> SS<P, T> {
    SS(p, PhantomData)
}

impl<P: OParser<T>, T, CF: BackTo> SSParser<CF> for SS<P, T> {
    fn ss_parse<'a>(&self, i: &PIter<'a>, res: &mut String, _: &CF) -> SSRes<'a> {
        match self.0.parse(i) {
            Ok((i2, _, e)) => {
                res.push_str(i.str_to(i2.index()));
                Ok((i2, e))
            }
            Err(e) => Err(e),
        }
    }
}

pub struct Put<T: Display>(pub T);

impl<T: Display, CF: BackTo> SSParser<CF> for Put<T> {
    fn ss_parse<'a>(&self, i: &PIter<'a>, res: &mut String, _: &CF) -> SSRes<'a> {
        res.push_str(&self.0.to_string());
        Ok((i.clone(), None))
    }
}

pub struct SSkip<P: OParser<T>, T>(P, PhantomData<T>);

pub fn sskip<P: OParser<T>, T>(p: P) -> SSkip<P, T> {
    SSkip(p, PhantomData)
}

impl<P: OParser<T>, T, CF: BackTo> SSParser<CF> for SSkip<P, T> {
    fn ss_parse<'a>(&self, i: &PIter<'a>, _: &mut String, _: &CF) -> SSRes<'a> {
        match self.0.parse(i) {
            Ok((i2, _, e)) => Ok((i2, e)),
            Err(e) => Err(e),
        }
    }
}

pub struct SSOR<A, B>(A, B);

impl<CF: BackTo, A: SSParser<CF>, B: SSParser<CF>> SSParser<CF> for SSOR<A, B> {
    fn ss_parse<'a>(&self, it: &PIter<'a>, res: &mut String, cf: &CF) -> SSRes<'a> {
        let pos = res.len();
        match self.0.ss_parse(it, res, cf) {
            Ok((r, e)) => Ok((r, e)),
            Err(e) if e.is_break => Err(e),
            Err(e) => {
                cf.back(pos);
                res.truncate(pos);
                match self.1.ss_parse(it, res, cf) {
                    Ok((r, ex)) => Ok((r, ex)),
                    Err(e2) if e2.is_break => Err(e2),
                    Err(e2) => Err(e.longer(e2)),
                }
            }
        }
    }
}

pub struct SSDebug(pub &'static str);

impl<CF: BackTo> SSParser<CF> for SSDebug {
    fn ss_parse<'a>(&self, it: &PIter<'a>, _: &mut String, _: &CF) -> SSRes<'a> {
        let (l, c) = it.lc();
        println!("SS DEBUG (l{},c{}): {}, ", l, c, self.0);
        Ok((it.clone(), None))
    }
}