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
163
164
165
166
167
168
169
170
171
172
173
174
175

use crate::maybe_byte::MaybeByte;

/// State of the lexer
#[derive(Clone, Copy, PartialEq, Eq)]
#[repr(C)]
pub struct LexState {
    value: i32,
}

impl LexState {
    pub(crate) fn is(&self, value: i32) -> bool {
        self.value == value
    }

    pub(crate) fn is_some(&self, states: i32) -> bool {
        (self.value & states) != 0
    }

    pub(crate) fn is_all(&self, states: i32) -> bool {
        (self.value & states) == states
    }

    /// Sets state to given `value`
    pub fn set(&mut self, value: i32) {
        self.value = value
    }

    pub(crate) fn get(&self) -> i32 {
        self.value
    }

    pub(crate) fn is_after_operator(&self) -> bool {
        self.is_some(EXPR_FNAME | EXPR_DOT)
    }
    pub(crate) fn is_end(&self) -> bool {
        self.is_some(EXPR_END_ANY)
    }
    pub(crate) fn is_arg(&self) -> bool {
        self.is_some(EXPR_ARG_ANY)
    }
    pub(crate) fn is_label_possible(&self, cmd_state: bool) -> bool {
        (self.is_some(EXPR_LABEL | EXPR_ENDFN) && !cmd_state) || self.is_arg()
    }
    pub(crate) fn is_spacearg(&self, c: &MaybeByte, space_seen: bool) -> bool {
        self.is_arg() && space_seen && !c.is_space()
    }
    pub(crate) fn is_beg(&self) -> bool {
        self.is_some(EXPR_BEG_ANY) || self.is_all(EXPR_ARG | EXPR_LABELED)
    }
}

impl Default for LexState {
    fn default() -> Self {
        Self { value: EXPR_BEG }
    }
}

/// Mod with all known lex states
pub mod lex_states {
    /// EXPR_BEG state in MRI
    pub const EXPR_BEG: i32 = 1 << 0;

    /// EXPR_END state in MRI
    pub const EXPR_END: i32 = 1 << 1;

    /// EXPR_ENDARG state in MRI
    pub const EXPR_ENDARG: i32 = 1 << 2;

    /// EXPR_ENDFN state in MRI
    pub const EXPR_ENDFN: i32 = 1 << 3;

    /// EXPR_ARG state in MRI
    pub const EXPR_ARG: i32 = 1 << 4;

    /// EXPR_CMDARG state in MRI
    pub const EXPR_CMDARG: i32 = 1 << 5;

    /// EXPR_MID state in MRI
    pub const EXPR_MID: i32 = 1 << 6;

    /// EXPR_FNAME state in MRI
    pub const EXPR_FNAME: i32 = 1 << 7;

    /// EXPR_DOT state in MRI
    pub const EXPR_DOT: i32 = 1 << 8;

    /// EXPR_CLASS state in MRI
    pub const EXPR_CLASS: i32 = 1 << 9;

    /// EXPR_LABEL state in MRI
    pub const EXPR_LABEL: i32 = 1 << 10;

    /// EXPR_LABELED state in MRI
    pub const EXPR_LABELED: i32 = 1 << 11;

    /// EXPR_FITEM state in MRI
    pub const EXPR_FITEM: i32 = 1 << 12;

    /// EXPR_VALUE state in MRI
    pub const EXPR_VALUE: i32 = EXPR_BEG;

    /// EXPR_BEG_ANY state in MRI
    pub const EXPR_BEG_ANY: i32 = EXPR_BEG | EXPR_MID | EXPR_CLASS;

    /// EXPR_ARG_ANY state in MRI
    pub const EXPR_ARG_ANY: i32 = EXPR_ARG | EXPR_CMDARG;

    /// EXPR_END_ANY state in MRI
    pub const EXPR_END_ANY: i32 = EXPR_END | EXPR_ENDARG | EXPR_ENDFN;

    /// EXPR_NONE state in MRI
    pub const EXPR_NONE: i32 = 0;
}
use lex_states::*;

impl std::fmt::Debug for LexState {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let mut states: Vec<&'static str> = vec![];

        if self.is_some(EXPR_BEG) {
            states.push("EXPR_BEG")
        }
        if self.is_some(EXPR_END) {
            states.push("EXPR_END")
        }
        if self.is_some(EXPR_ENDARG) {
            states.push("EXPR_ENDARG")
        }
        if self.is_some(EXPR_ENDFN) {
            states.push("EXPR_ENDFN")
        }
        if self.is_some(EXPR_ARG) {
            states.push("EXPR_ARG")
        }
        if self.is_some(EXPR_CMDARG) {
            states.push("EXPR_CMDARG")
        }
        if self.is_some(EXPR_MID) {
            states.push("EXPR_MID")
        }
        if self.is_some(EXPR_FNAME) {
            states.push("EXPR_FNAME")
        }
        if self.is_some(EXPR_DOT) {
            states.push("EXPR_DOT")
        }
        if self.is_some(EXPR_CLASS) {
            states.push("EXPR_CLASS")
        }
        if self.is_some(EXPR_LABEL) {
            states.push("EXPR_LABEL")
        }
        if self.is_some(EXPR_FITEM) {
            states.push("EXPR_FITEM")
        }
        if self.is_some(EXPR_NONE) {
            states.push("EXPR_NONE")
        }

        if self.is_some(EXPR_VALUE) {
            states.push("Also(EXPR_VALUE)")
        }
        if self.is_some(EXPR_BEG_ANY) {
            states.push("Also(EXPR_BEG_ANY)")
        }
        if self.is_some(EXPR_END_ANY) {
            states.push("Also(EXPR_END_ANY)")
        }
        if self.is_some(EXPR_END_ANY) {
            states.push("Also(EXPR_END_ANY)")
        }

        f.write_str(&states.join("|"))
    }
}