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
138
139
140

use std::fmt::Debug;
use std::marker::PhantomData;

use crate::ctx::Context;
use crate::ctx::CtxGuard;
use crate::ctx::Match;
use crate::ctx::Ret;
use crate::ctx::Span;
use crate::err::Error;
use crate::map::Select0;
use crate::map::Select1;
use crate::map::SelectEq;
use crate::re::ctor::Map;
use crate::re::def_not;
use crate::re::trace;
use crate::re::Regex;

#[derive(Default, Copy)]
pub struct DynamicCreateRegexThen<C, P, F> {
    pat: P,
    func: F,
    marker: PhantomData<C>,
}

def_not!(DynamicCreateRegexThen<C, P, F>);

impl<C, P, F> Debug for DynamicCreateRegexThen<C, P, F>
where
    P: Debug,
    F: Debug,
{
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("DynamicCreateRegexThen")
            .field("pat", &self.pat)
            .field("func", &self.func)
            .finish()
    }
}

impl<C, P, F> Clone for DynamicCreateRegexThen<C, P, F>
where
    P: Clone,
    F: Clone,
{
    fn clone(&self) -> Self {
        Self {
            pat: self.pat.clone(),
            func: self.func.clone(),
            marker: self.marker,
        }
    }
}

impl<C, P, F> DynamicCreateRegexThen<C, P, F> {
    pub fn new(pat: P, func: F) -> Self {
        Self {
            pat,
            func,
            marker: PhantomData,
        }
    }

    pub fn pat(&self) -> &P {
        &self.pat
    }

    pub fn pat_mut(&mut self) -> &mut P {
        &mut self.pat
    }

    pub fn func(&self) -> &F {
        &self.func
    }

    pub fn func_mut(&mut self) -> &mut F {
        &mut self.func
    }

    pub fn set_pat(&mut self, pat: P) -> &mut Self {
        self.pat = pat;
        self
    }

    pub fn set_func(&mut self, func: F) -> &mut Self {
        self.func = func;
        self
    }

    pub fn _0<O>(self) -> Map<C, Self, Select0, O> {
        Map::new(self, Select0)
    }

    pub fn _1<O>(self) -> Map<C, Self, Select1, O> {
        Map::new(self, Select1)
    }

    pub fn _eq<I1, I2>(self) -> Map<C, Self, SelectEq, (I1, I2)> {
        Map::new(self, SelectEq)
    }
}

impl<'a, C, P, F, T> Regex<C> for DynamicCreateRegexThen<C, P, F>
where
    P: Regex<C, Ret = Span>,
    T: Regex<C, Ret = Span>,
    C: Context<'a> + Match<C>,
    F: Fn(&Span) -> Result<T, Error>,
{
    type Ret = P::Ret;

    #[inline(always)]
    fn try_parse(&self, ctx: &mut C) -> Result<Self::Ret, Error> {
        let mut g = CtxGuard::new(ctx);
        let beg = g.beg();
        let mut ret = trace!("dynamic_create_regex_then", beg @ "pat", g.try_mat(&self.pat)?);

        ret.add_assign(
            trace!("dynamic_create_regex_then", beg @ "dynamic regex", g.try_mat(&(self.func)(&ret)?)?)
        );
        trace!("dynamic_create_regex_then", beg => g.end(), Ok(ret))
    }
}

pub trait DynamicCreateRegexThenHelper<'a, C>
where
    Self: Sized,
    C: Context<'a> + Match<C>,
{
    fn dyn_then_regex<F>(self, func: F) -> DynamicCreateRegexThen<C, Self, F>;
}

impl<'a, C, T> DynamicCreateRegexThenHelper<'a, C> for T
where
    Self: Sized,
    C: Context<'a> + Match<C>,
{
    fn dyn_then_regex<F>(self, func: F) -> DynamicCreateRegexThen<C, Self, F> {
        DynamicCreateRegexThen::new(self, func)
    }
}