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

//! the [post (PostScript)](https://docs.microsoft.com/en-us/typography/opentype/spec/post#header) table

include!("../../generated/generated_post.rs");

impl<'a> Post<'a> {
    /// The number of glyph names covered by this table
    pub fn num_names(&self) -> usize {
        match self.version() {
            Version16Dot16::VERSION_1_0 => DEFAULT_GLYPH_NAMES.len(),
            Version16Dot16::VERSION_2_0 => self.num_glyphs().unwrap() as usize,
            _ => 0,
        }
    }

    pub fn glyph_name(&self, glyph_id: GlyphId) -> Option<&str> {
        let glyph_id = glyph_id.to_u16() as usize;
        match self.version() {
            Version16Dot16::VERSION_1_0 => DEFAULT_GLYPH_NAMES.get(glyph_id).copied(),
            Version16Dot16::VERSION_2_0 => {
                let idx = self.glyph_name_index()?.get(glyph_id)?.get() as usize;
                if idx < DEFAULT_GLYPH_NAMES.len() {
                    return DEFAULT_GLYPH_NAMES.get(idx).copied();
                }
                let idx = idx - DEFAULT_GLYPH_NAMES.len();
                match self.string_data().unwrap().get(idx) {
                    Some(Ok(s)) => Some(s.0),
                    _ => None,
                }
            }
            _ => None,
        }
    }

    //FIXME: how do we want to traverse this? I want to stop needing to
    // add special cases for things...
    #[cfg(feature = "traversal")]
    fn traverse_string_data(&self) -> FieldType<'a> {
        FieldType::I8(-42) // meaningless value
    }
}

/// A string in the post table.
///
/// This is basically just a newtype that knows how to parse from a Pascal-style
/// string.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct PString<'a>(&'a str);

impl<'a> PString<'a> {
    pub fn as_str(&self) -> &'a str {
        self.0
    }
}

impl<'a> std::ops::Deref for PString<'a> {
    type Target = str;
    fn deref(&self) -> &Self::Target {
        self.0
    }
}

impl PartialEq<&str> for PString<'_> {
    fn eq(&self, other: &&str) -> bool {
        self.0 == *other
    }
}

impl<'a> FontRead<'a> for PString<'a> {
    fn read(data: FontData<'a>) -> Result<Self, ReadError> {
        let len: u8 = data.read_at(0)?;
        let pstring = data
            .as_bytes()
            .get(1..len as usize + 1)
            .ok_or(ReadError::OutOfBounds)?;

        if pstring.is_ascii() {
            Ok(PString(std::str::from_utf8(pstring).unwrap()))
        } else {
            //FIXME not really sure how we want to handle this?
            Err(ReadError::MalformedData("Must be valid ascii"))
        }
    }
}

impl VarSize for PString<'_> {
    type Size = u8;
}

/// The 258 glyph names defined for Macintosh TrueType fonts
#[rustfmt::skip]
pub static DEFAULT_GLYPH_NAMES: [&str; 258] = [
    ".notdef", ".null", "nonmarkingreturn", "space", "exclam", "quotedbl", "numbersign", "dollar",
    "percent", "ampersand", "quotesingle", "parenleft", "parenright", "asterisk", "plus", "comma",
    "hyphen", "period", "slash", "zero", "one", "two", "three", "four", "five", "six", "seven",
    "eight", "nine", "colon", "semicolon", "less", "equal", "greater", "question", "at", "A", "B",
    "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U",
    "V", "W", "X", "Y", "Z", "bracketleft", "backslash", "bracketright", "asciicircum",
    "underscore", "grave", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n",
    "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "braceleft", "bar", "braceright",
    "asciitilde", "Adieresis", "Aring", "Ccedilla", "Eacute", "Ntilde", "Odieresis", "Udieresis",
    "aacute", "agrave", "acircumflex", "adieresis", "atilde", "aring", "ccedilla", "eacute",
    "egrave", "ecircumflex", "edieresis", "iacute", "igrave", "icircumflex", "idieresis", "ntilde",
    "oacute", "ograve", "ocircumflex", "odieresis", "otilde", "uacute", "ugrave", "ucircumflex",
    "udieresis", "dagger", "degree", "cent", "sterling", "section", "bullet", "paragraph",
    "germandbls", "registered", "copyright", "trademark", "acute", "dieresis", "notequal", "AE",
    "Oslash", "infinity", "plusminus", "lessequal", "greaterequal", "yen", "mu", "partialdiff",
    "summation", "product", "pi", "integral", "ordfeminine", "ordmasculine", "Omega", "ae",
    "oslash", "questiondown", "exclamdown", "logicalnot", "radical", "florin", "approxequal",
    "Delta", "guillemotleft", "guillemotright", "ellipsis", "nonbreakingspace", "Agrave", "Atilde",
    "Otilde", "OE", "oe", "endash", "emdash", "quotedblleft", "quotedblright", "quoteleft",
    "quoteright", "divide", "lozenge", "ydieresis", "Ydieresis", "fraction", "currency",
    "guilsinglleft", "guilsinglright", "fi", "fl", "daggerdbl", "periodcentered", "quotesinglbase",
    "quotedblbase", "perthousand", "Acircumflex", "Ecircumflex", "Aacute", "Edieresis", "Egrave",
    "Iacute", "Icircumflex", "Idieresis", "Igrave", "Oacute", "Ocircumflex", "apple", "Ograve",
    "Uacute", "Ucircumflex", "Ugrave", "dotlessi", "circumflex", "tilde", "macron", "breve",
    "dotaccent", "ring", "cedilla", "hungarumlaut", "ogonek", "caron", "Lslash", "lslash",
    "Scaron", "scaron", "Zcaron", "zcaron", "brokenbar", "Eth", "eth", "Yacute", "yacute", "Thorn",
    "thorn", "minus", "multiply", "onesuperior", "twosuperior", "threesuperior", "onehalf",
    "onequarter", "threequarters", "franc", "Gbreve", "gbreve", "Idotaccent", "Scedilla",
    "scedilla", "Cacute", "cacute", "Ccaron", "ccaron", "dcroat",
];

#[cfg(test)]
mod tests {
    use super::*;
    use font_test_data::post as test_data;

    #[test]
    fn test_post() {
        let table = Post::read(test_data::SIMPLE.into()).unwrap();
        assert_eq!(table.version(), Version16Dot16::VERSION_2_0);
        assert_eq!(table.underline_position(), FWord::new(-75));
        assert_eq!(table.glyph_name(GlyphId::new(1)), Some(".notdef"));
        assert_eq!(table.glyph_name(GlyphId::new(2)), Some("space"));
        assert_eq!(table.glyph_name(GlyphId::new(7)), Some("hello"));
        assert_eq!(table.glyph_name(GlyphId::new(8)), Some("hi"));
        assert_eq!(table.glyph_name(GlyphId::new(9)), Some("hola"));
    }
}