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

// RTF parser for Text Editor
// Support RTF version 1.9.1
// specification is available here : https://dokumen.tips/documents/rtf-specification.html

mod lexer;
mod parser;
mod header;
mod utils;

// expose the lexer and the parser
pub use crate::lexer::Lexer as Lexer;
pub use crate::parser::Parser as Parser;

#[allow(dead_code)]
#[derive(Debug, PartialEq, Eq, Clone)]
pub enum Token<'a> {
    PlainText(&'a str),
    OpeningBracket,
    ClosingBracket,
    CRLF, // Line-return \n
    IgnorableDestination, // \*\ <destination-name>
    ControlSymbol(ControlSymbol<'a>),
}


// A control symbol is a pair (control_word, property)
// In the RTF specifiaction, it refer to 'control word entity'
type ControlSymbol<'a> = (ControlWord<'a>, Property);

// Parameters for a control word
#[allow(dead_code)]
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum Property {
    On,  // 1
    Off, // 0
    Value(i32),
    None, // No parameter
}

impl Property {
    fn as_bool(&self) -> bool {
        match self {
            Property::On => true,
            Property::Off => false,
            Property::None => true,
            Property::Value(val) => if *val == 1 { true } else { false },
        }
    }

    fn get_value(&self) -> i32 {
        if let Property::Value(value) = &self {
            return *value;
        }
        return 0;
    }
}

#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum ControlWord<'a> {
    Rtf,
    Ansi,

    FontTable,
    FontCharset,
    FontNumber,
    FontSize,

    ColorTable,
    FileTable,

    Italic,
    Bold,
    Underline,

    Unknown(&'a str),
}

impl<'a> ControlWord<'a> {
    pub fn from(input: &str) -> ControlSymbol {
        // Loop backward the string to get the number
        let mut it = input.chars().rev();
        let mut suffix_index = 0;
        while let Some(c) = it.next() {
            match c {
                '0'..='9' | '-' => {
                    suffix_index += 1;
                }
                _ => break,
            }
        }

        // f0 -> prefix: f, suffix: 0
        let index = input.len() - suffix_index;
        let prefix = &input[..index];
        let suffix = &input[index..];

        let property = if suffix == "" {
            Property::None
        } else {
            Property::Value(suffix.parse::<i32>().expect(&format!("[Lexer] Unable to parse {} as integer", &suffix)))
        };

        let control_word = match prefix {
            r"\rtf" => ControlWord::Rtf,
            r"\ansi" => ControlWord::Ansi,
            r"\fonttbl" => ControlWord::FontTable,
            r"\colortabl" => ControlWord::ColorTable,
            r"\filetbl" => ControlWord::FileTable,
            r"\fcharset" => ControlWord::FontCharset,
            r"\f" => ControlWord::FontNumber,
            r"\fs" => ControlWord::FontSize,
            r"\i" => ControlWord::Italic,
            r"\b" => ControlWord::Bold,
            r"\u" => ControlWord::Underline,
            _ => ControlWord::Unknown(prefix),
        };
        return (control_word, property);
    }
}

#[cfg(test)]
mod tests {
    use crate::{ControlWord, Property};

    #[test]
    fn control_word_from_input_test() {
        let input = r"\rtf1";
        assert_eq!(ControlWord::from(input), (ControlWord::Rtf, Property::Value(1)))
    }

    #[test]
    fn control_word_with_negative_parameter() {
        let input = r"\rtf-1";
        assert_eq!(ControlWord::from(input), (ControlWord::Rtf, Property::Value(-1)))
    }
}