rulex 0.4.4

DEPRECATED: Use pomsky instead. A new regular expression language
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

use std::collections::HashMap;

use crate::{
    compile::{CompileResult, CompileState},
    error::{CompileError, ParseError},
    features::RulexFeatures,
    options::{CompileOptions, ParseOptions},
    repetition::RegexQuantifier,
    rule::Rule,
    span::Span,
};

#[derive(Clone)]
pub(crate) struct StmtExpr<'i> {
    stmt: Stmt<'i>,
    rule: Rule<'i>,
    pub(crate) span: Span,
}

#[derive(Clone)]
pub(crate) enum Stmt<'i> {
    Enable(BooleanSetting),
    Disable(BooleanSetting),
    Let(Let<'i>),
}

#[derive(Clone, PartialEq, Eq)]
pub(crate) enum BooleanSetting {
    Lazy,
}

#[derive(Clone)]
pub(crate) struct Let<'i> {
    name: &'i str,
    rule: Rule<'i>,
    pub(crate) name_span: Span,
}

impl<'i> Let<'i> {
    pub(crate) fn new(name: &'i str, rule: Rule<'i>, name_span: Span) -> Self {
        Self { name, rule, name_span }
    }

    pub(crate) fn name(&self) -> &'i str {
        self.name
    }
}

impl<'i> StmtExpr<'i> {
    pub(crate) fn new(stmt: Stmt<'i>, rule: Rule<'i>, span: Span) -> Self {
        Self { stmt, rule, span }
    }

    pub(crate) fn get_capturing_groups(
        &self,
        count: &mut u32,
        map: &'i mut HashMap<String, u32>,
        within_variable: bool,
    ) -> Result<(), CompileError> {
        if let Stmt::Let(l) = &self.stmt {
            l.rule.get_capturing_groups(count, map, true)?;
        }
        self.rule.get_capturing_groups(count, map, within_variable)
    }

    pub(crate) fn compile<'c>(
        &'c self,
        options: CompileOptions,
        state: &mut CompileState<'c, 'i>,
    ) -> CompileResult<'i> {
        match &self.stmt {
            Stmt::Enable(BooleanSetting::Lazy) => {
                let prev = state.default_quantifier;
                state.default_quantifier = RegexQuantifier::Lazy;
                let res = self.rule.comp(options, state)?;
                state.default_quantifier = prev;
                Ok(res)
            }
            Stmt::Disable(BooleanSetting::Lazy) => {
                let prev = state.default_quantifier;
                state.default_quantifier = RegexQuantifier::Greedy;
                let res = self.rule.comp(options, state)?;
                state.default_quantifier = prev;
                Ok(res)
            }
            Stmt::Let(r#let) => {
                state.variables.push((r#let.name, &r#let.rule));
                let res = self.rule.comp(options, state)?;
                state.variables.pop();
                Ok(res)
            }
        }
    }

    pub(crate) fn validate(&self, options: &ParseOptions) -> Result<(), ParseError> {
        match &self.stmt {
            Stmt::Enable(BooleanSetting::Lazy) => {
                options.allowed_features.require(RulexFeatures::LAZY_MODE, self.span)?;
            }
            Stmt::Disable(_) => {}
            Stmt::Let(l) => {
                options.allowed_features.require(RulexFeatures::VARIABLES, l.name_span)?;
                l.rule.validate(options)?;
            }
        }

        self.rule.validate(options)
    }
}

#[cfg(feature = "dbg")]
impl std::fmt::Debug for StmtExpr<'_> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        struct DisplayDebug<T>(T);
        impl<T: std::fmt::Display> std::fmt::Debug for DisplayDebug<T> {
            fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
                write!(f, "{}", self.0)
            }
        }

        let mut x = f.debug_tuple("StmtExpr");
        let mut x = &mut x;
        match &self.stmt {
            Stmt::Enable(BooleanSetting::Lazy) => x = x.field(&DisplayDebug("enable lazy")),
            Stmt::Disable(BooleanSetting::Lazy) => x = x.field(&DisplayDebug("disable lazy")),
            Stmt::Let(r#let) => x = x.field(r#let),
        }
        x.field(&self.rule).finish()
    }
}

#[cfg(feature = "dbg")]
impl std::fmt::Debug for Let<'_> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "let {} = {:#?}", self.name, self.rule)
    }
}