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
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162

use proc_macro::{TokenStream};

use makepad_micro_proc_macro::{TokenBuilder, TokenParser, error};

const LIVE_ID_SEED:u64 = 0xd6e8_feb8_6659_fd93;

const fn from_bytes(seed:u64, id_bytes: &[u8], start: usize, end: usize) -> u64 {
    let mut x = seed;
    let mut i = start;
    while i < end {
        x = x.overflowing_add(id_bytes[i] as u64).0;
        x ^= x >> 32;
        x = x.overflowing_mul(0xd6e8_feb8_6659_fd93).0;
        x ^= x >> 32;
        x = x.overflowing_mul(0xd6e8_feb8_6659_fd93).0;
        x ^= x >> 32;
        i += 1;
    }
    // mark high bit as meaning that this is a hash id
    (x & 0x7fff_ffff_ffff_ffff) | 0x8000_0000_0000_0000
}

const fn from_str_unchecked(id_str: &str) -> u64 {
    let bytes = id_str.as_bytes();
    from_bytes(LIVE_ID_SEED, bytes, 0, bytes.len())
}

mod derive_from_live_id;
use crate::derive_from_live_id::*;

#[proc_macro] 
pub fn live_id(item: TokenStream) -> TokenStream {
    let mut tb = TokenBuilder::new(); 

    let mut parser = TokenParser::new(item);
    if let Some(name) = parser.eat_any_ident() {
        let id = from_str_unchecked(&name);
        tb.add("LiveId (").suf_u64(id).add(")");
        tb.end()
    }
    else if let Some(punct) = parser.eat_any_punct(){
        let id = from_str_unchecked(&punct);
        tb.add("LiveId (").suf_u64(id).add(")");
        tb.end()
    }
    else if let Some(v) = parser.eat_literal(){
        if let Ok(v) = v.to_string().parse::<u64>(){
            tb.add("LiveId (").suf_u64(v).add(")");
            return tb.end()
        }
        else{
            parser.unexpected()
        }
    }
    else{
        parser.unexpected()
    }
}

#[proc_macro] 
pub fn id(item: TokenStream) -> TokenStream {
    let mut tb = TokenBuilder::new(); 
    let mut parser = TokenParser::new(item);
    fn parse(parser:&mut TokenParser, tb:&mut TokenBuilder)->Result<(),TokenStream>{
        tb.add("&[");
        loop{
            let ident = parser.expect_any_ident()?;
            let id = from_str_unchecked(&ident);
            tb.add("LiveId (").suf_u64(id).add("),");
            if parser.eat_eot(){
                tb.add("]");
                return Ok(())
            }
            parser.expect_punct_alone('.')?
        }
    }
    if let Err(e) = parse(&mut parser, &mut tb){
        return e
    };
    tb.end()
}

#[proc_macro] 
pub fn ids(item: TokenStream) -> TokenStream {
    let mut tb = TokenBuilder::new(); 
    let mut parser = TokenParser::new(item);
    fn parse(parser:&mut TokenParser, tb:&mut TokenBuilder)->Result<(),TokenStream>{
        tb.add("&[");
        'outer: loop{
            tb.add("&[");
            loop{
                let ident = parser.expect_any_ident()?;
                let id = from_str_unchecked(&ident);
                tb.add("LiveId (").suf_u64(id).add("),");
                if parser.eat_eot(){
                    tb.add("]");
                    break 'outer
                }
                if parser.eat_punct_alone(','){
                    tb.add("]");
                    break
                }
                parser.expect_punct_alone('.')?
            }
            tb.add(",");
            if parser.eat_eot(){
                break;
            }
        }
        tb.add("]");
        Ok(())
    }
    if let Err(e) = parse(&mut parser, &mut tb){
        return e
    };
    tb.end()
}


// absolutely a very bad idea but lets see if we can do this.
#[proc_macro]
pub fn live_id_num(item: TokenStream) -> TokenStream {
    let mut tb = TokenBuilder::new(); 

    let mut parser = TokenParser::new(item);
    if let Some(name) = parser.eat_any_ident() {
        if !parser.eat_punct_alone(','){
            return error("please add a number")
        }
        // then eat the next bit
        let arg = parser.eat_level();
        let id = from_str_unchecked(&name);
        tb.add("LiveId::from_num(").suf_u64(id).add(",").stream(Some(arg)).add(")");
        tb.end()
    }
    else{
        parser.unexpected()
    }
}

#[proc_macro]
pub fn id_lut(item: TokenStream) -> TokenStream {
    let mut tb = TokenBuilder::new(); 

    let mut parser = TokenParser::new(item);
    if let Some(name) = parser.eat_any_ident() {
        tb.add("LiveId::from_str_with_lut(").string(&name).add(").unwrap()");
        tb.end()
    }
    else if let Some(punct) = parser.eat_any_punct(){
        tb.add("LiveId::from_str_with_lut(").string(&punct).add(").unwrap()");
        tb.end()
    }
    else{
        parser.unexpected()
    }
}

#[proc_macro_derive(FromLiveId)]
pub fn derive_from_live_id(input: TokenStream) -> TokenStream {
    derive_from_live_id_impl(input)
}