vle 1.16.0

Very Little Editor - an exercise in minimalist text editing
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

// Copyright 2026 Brian Langenberger
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use crate::highlighter;
use crate::syntax::{Commenting, Highlight, Plain, color};
use logos::Logos;
use ratatui::style::Color;

#[derive(Logos, Debug)]
#[logos(skip r"[ \t\n]+")]
enum CToken {
    #[regex("[[:upper:]_][[:upper:][:digit:]_]+")]
    Constant,

    #[regex("[[:lower:][:upper:]_][[:lower:][:upper:][:digit:]_]*")]
    Variable,

    #[token("alignas")]
    #[token("alignof")]
    #[token("auto")]
    #[token("bool")]
    #[token("const")]
    #[token("constexpr")]
    #[token("char")]
    #[token("double")]
    #[token("enum")]
    #[token("extern")]
    #[token("float")]
    #[token("inline")]
    #[token("int")]
    #[token("long")]
    #[token("nullptr")]
    #[token("restrict")]
    #[token("register")]
    #[token("short")]
    #[token("signed")]
    #[token("sizeof")]
    #[token("static")]
    #[token("static_assert")]
    #[token("thread_local")]
    #[token("struct")]
    #[token("typedef")]
    #[token("typeof")]
    #[token("typeof_unqual")]
    #[token("union")]
    #[token("unsigned")]
    #[token("void")]
    #[token("volatile")]
    Keyword,

    #[token("if")]
    #[token("else")]
    #[token("for")]
    #[token("while")]
    #[token("do")]
    #[token("switch")]
    #[token("case")]
    #[token("default")]
    Flowcontrol1,

    #[token("break")]
    #[token("continue")]
    #[token("goto")]
    #[token("return")]
    Flowcontrol2,

    #[regex("//.*", allow_greedy = true)]
    Comment,

    #[token("/*")]
    StartComment,

    #[token("*/")]
    EndComment,

    #[regex(r#"\"([^\\\"]|\\.)*\""#)]
    #[regex(r"'([^\\\']|\\.){0,1}'")]
    String,

    #[regex(r"0[xX][0-9a-fA-F]+[uU]?(|ll|LL)?")]
    #[regex(r"[0-9][0-9']*[uU]?(ll|LL)?")]
    #[regex(r"0b[01]+")]
    Integer,

    #[token("true")]
    #[token("false")]
    Boolean,

    #[token("#define")]
    #[token("#embed")]
    #[token("#include")]
    #[token("#if")]
    #[token("#ifdef")]
    #[token("#ifndef")]
    #[token("#elif")]
    #[token("#error")]
    #[token("#warning")]
    #[token("#pragma")]
    #[token("#else")]
    #[token("#endif")]
    #[token("#undef")]
    Preprocessor,
}

impl TryFrom<CToken> for Highlight {
    type Error = ();

    fn try_from(t: CToken) -> Result<Highlight, ()> {
        match t {
            CToken::Constant => Ok(color::CONSTANT),
            CToken::Integer | CToken::Boolean => Ok(color::NUMBER),
            CToken::Keyword => Ok(color::KEYWORD),
            CToken::Flowcontrol1 | CToken::Flowcontrol2 => Ok(color::FLOW),
            CToken::Comment => Ok(color::COMMENT),
            CToken::String => Ok(color::STRING),
            CToken::Variable => Err(()),
            CToken::Preprocessor => Ok(Color::LightCyan.into()),
            CToken::StartComment | CToken::EndComment => Ok(color::COMMENT),
        }
    }
}

#[derive(Debug)]
pub struct C;

impl std::fmt::Display for C {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        "C".fmt(f)
    }
}

highlighter!(
    C,
    CToken,
    StartComment,
    EndComment,
    "/*",
    "*/",
    color::COMMENT
);