sipha 3.0.0

PEG parser, syntax trees, and code generation
Documentation 
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

use crate::parse::builder::GrammarBuilder;
use crate::types::CharClass;

use super::classes;

#[inline]
fn digits1(g: &mut GrammarBuilder, digit: CharClass, label: &str) {
    g.consume_while_class1_with_label(digit, label);
}

#[inline]
fn digits0_uscore(g: &mut GrammarBuilder, digit: CharClass, label: &str) {
    g.zero_or_more(|g| {
        g.choice(
            |g| {
                g.class_with_label(digit, label);
            },
            |g| {
                g.byte(b'_');
                g.class_with_label(digit, label);
            },
        );
    });
}

#[inline]
fn digits1_uscore(g: &mut GrammarBuilder, digit: CharClass, label: &str) {
    g.class_with_label(digit, label);
    digits0_uscore(g, digit, label);
}

/// ASCII decimal digits: `[0-9]+`.
#[inline]
pub fn dec_digits1(g: &mut GrammarBuilder) {
    digits1(g, classes::DIGIT, "digit");
}

/// ASCII hex digits: `[0-9a-fA-F]+`.
#[inline]
pub fn hex_digits1(g: &mut GrammarBuilder) {
    digits1(g, classes::HEX_DIGIT, "hex digit");
}

/// ASCII decimal digits with `_` separators: `[0-9] ([0-9] | '_' [0-9])*`.
///
/// Guarantees `_` only appears **between** digits.
#[inline]
pub fn dec_digits1_uscore(g: &mut GrammarBuilder) {
    digits1_uscore(g, classes::DIGIT, "digit");
}

/// ASCII hex digits with `_` separators: `[0-9a-fA-F] ([0-9a-fA-F] | '_' [0-9a-fA-F])*`.
#[inline]
pub fn hex_digits1_uscore(g: &mut GrammarBuilder) {
    digits1_uscore(g, classes::HEX_DIGIT, "hex digit");
}

/// ASCII binary digits: `[01]+`.
#[inline]
pub fn bin_digits1(g: &mut GrammarBuilder) {
    digits1(g, classes::BIN_DIGIT, "binary digit");
}

/// ASCII octal digits: `[0-7]+`.
#[inline]
pub fn oct_digits1(g: &mut GrammarBuilder) {
    digits1(g, classes::OCT_DIGIT, "octal digit");
}

/// ASCII binary digits with `_` separators.
#[inline]
pub fn bin_digits1_uscore(g: &mut GrammarBuilder) {
    digits1_uscore(g, classes::BIN_DIGIT, "binary digit");
}

/// ASCII octal digits with `_` separators.
#[inline]
pub fn oct_digits1_uscore(g: &mut GrammarBuilder) {
    digits1_uscore(g, classes::OCT_DIGIT, "octal digit");
}

/// A minimal JSON-style number:
/// `-? (0 | [1-9][0-9]*) ('.' [0-9]+)? ([eE] [+-]? [0-9]+)?`
///
/// This is byte-based (ASCII) and does not accept `_` separators.
pub fn number_json(g: &mut GrammarBuilder) {
    g.optional(|g| {
        g.byte(b'-');
    });

    g.choice(
        |g| {
            g.byte(b'0');
        },
        |g| {
            g.class(CharClass::EMPTY.with_range(b'1', b'9'));
            g.zero_or_more(|g| {
                g.class(classes::DIGIT);
            });
        },
    );

    g.optional(|g| {
        g.byte(b'.');
        dec_digits1(g);
    });

    g.optional(|g| {
        g.byte_either(b'e', b'E');
        g.optional(|g| {
            g.byte_either(b'+', b'-');
        });
        dec_digits1(g);
    });
}

/// Like [`number_json`], but allows `_` separators in the digit runs (non-standard JSON).
///
/// Useful for "code number" lexers.
pub fn number_json_uscore(g: &mut GrammarBuilder) {
    g.optional(|g| {
        g.byte(b'-');
    });

    g.choice(
        |g| {
            g.byte(b'0');
        },
        |g| {
            g.class(CharClass::EMPTY.with_range(b'1', b'9'));
            // Remaining integer digits, allowing `_` between digits.
            digits0_uscore(g, classes::DIGIT, "digit");
        },
    );

    g.optional(|g| {
        g.byte(b'.');
        dec_digits1_uscore(g);
    });

    g.optional(|g| {
        g.byte_either(b'e', b'E');
        g.optional(|g| {
            g.byte_either(b'+', b'-');
        });
        dec_digits1_uscore(g);
    });
}