katex-parser 0.1.0

A port of the KaTeX parser: lexing and parsing LaTeX math expressions with macro expansion into a typed AST, plus a Unicode rendering backend
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

use std::rc::Rc;

use crate::anvil::SpacingSpec;
use crate::ast::StyleLevel;

/// Configuration for the Unicode renderer.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct RenderConfig {
    pub fraction_slash: String,
    pub spacing: SpacingSpec,
    pub line_style: LineStyle,
}

/// Glyph style for drawn lines: fraction bars, boxes, tables, etc.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[derive(Default)]
pub enum LineStyle {
    Ascii,
    #[default]
    Unicode,
}


/// Unicode text spacing: regular spaces for thick/medium, thin and after
/// operators.
pub fn unicode_text_spacing() -> SpacingSpec {
    SpacingSpec {
        thick: " ".to_string(),
        medium: " ".to_string(),
        thin: " ".to_string(),
        operator: " ".to_string(),
    }
}

impl RenderConfig {
    pub fn new() -> Self {
        RenderConfig {
            fraction_slash: "∕".to_string(),
            spacing: unicode_text_spacing(),
            line_style: LineStyle::Unicode,
        }
    }
}

impl Default for RenderConfig {
    fn default() -> Self {
        RenderConfig::new()
    }
}

/// The line character for a fraction bar under the given style.
pub fn line_style_frac_bar(style: LineStyle) -> String {
    match style {
        LineStyle::Ascii => "-".to_string(),
        LineStyle::Unicode => "─".to_string(),
    }
}

#[derive(Clone)]
pub(crate) struct RenderState {
    pub style: StyleLevel,
    pub in_display: bool,
    pub in_tight: bool,
    pub config: Rc<RenderConfig>,
}