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Support display sup/sub style for numbers #12

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Merged
merged 1 commit into from
Mar 13, 2020
Merged

Support display sup/sub style for numbers #12

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75 changes: 75 additions & 0 deletions src/helper.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -98,6 +98,8 @@ mod html {
pub enum Token {
Plain(String),
Bold(String),
Sup(String),
Sub(String),
Eof(String),
}

Expand All @@ -107,6 +109,61 @@ mod html {
fn render(&self) -> String;
}

pub fn superscript(n: u8) -> String {
if n == 0 {
"⁰".to_owned()
} else if n == 1 {
"¹".to_owned()
} else if n == 2 {
"²".to_owned()
} else if n == 3 {
"³".to_owned()
} else if n == 4 {
"⁴".to_owned()
} else if n == 5 {
"⁵".to_owned()
} else if n == 6 {
"⁶".to_owned()
} else if n == 7 {
"⁷".to_owned()
} else if n == 8 {
"⁸".to_owned()
} else if n == 9 {
"⁹".to_owned()
} else if n >= 10 {
superscript(n / 10) + &superscript(n % 10)
} else {
n.to_string()
}
}
Comment on lines +112 to +138
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@clearloop clearloop Mar 26, 2020 •
edited
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We can write like:

pub fn superscript(n: u8) -> String {
        match n {
            0 => "⁰".to_string(),
            1 => "¹".to_string(),
            2 => "²".to_string(),
            3 => "³".to_string(),
            4 => "⁴".to_string(),
            5 => "⁵".to_string(),
            6 => "⁶".to_string(),
            7 => "⁷".to_string(),
            8 => "⁸".to_string(),
            9 => "⁹".to_string(),
            x if x > 10 => (superscript(n / 10).parse().unwrap_or(0)
                + &superscript(n % 10).parse().unwrap_or(0))
                .to_string(),
            _ => n.to_string(),
        }
    }
}


pub fn subscript(n: u8) -> String {
if n >= 10 {
subscript(n / 10) + &subscript(n % 10)
} else if n == 0 {
"₀".to_owned()
} else if n == 1 {
"₁".to_owned()
} else if n == 2 {
"₂".to_owned()
} else if n == 3 {
"₃".to_owned()
} else if n == 4 {
"₄".to_owned()
} else if n == 5 {
"₅".to_owned()
} else if n == 6 {
"₆".to_owned()
} else if n == 7 {
"₇".to_owned()
} else if n == 8 {
"₈".to_owned()
} else if n == 9 {
"₉".to_owned()
} else {
n.to_string()
}
}
impl HTML for String {
fn ser(&self) -> Vec<Token> {
// empty tags
Expand All @@ -117,12 +174,20 @@ mod html {
let mut ptr = 0;
let mut output = vec![];
let mut bold = false;
let mut sup = false;
let mut sub = false;
for (i, e) in tks.chars().enumerate() {
match e {
'<' => {
if bold {
output.push(Token::Bold(tks[ptr..i].to_string()));
bold = false;
} else if sup {
output.push(Token::Sup(tks[ptr..i].to_string()));
sup = false;
} else if sub {
output.push(Token::Sub(tks[ptr..i].to_string()));
sub = false;
} else {
output.push(Token::Plain(tks[ptr..i].to_string()));
}
Expand All @@ -133,6 +198,8 @@ mod html {
"-" => continue,
_ => match &tks[(ptr + 1)..i] {
"b" | "strong" => bold = true,
"sup" => sup = true,
"sub" => sub = true,
_ => {}
},
}
Expand Down Expand Up @@ -168,6 +235,14 @@ mod html {

tks.push(s.bold().to_string());
}
Token::Sup(s) => tks.push(match s.parse::<u8>() {
Ok(n) => superscript(n),
_ => s,
}),
Token::Sub(s) => tks.push(match s.parse::<u8>() {
Ok(n) => subscript(n),
_ => s,
}),
Token::Eof(s) => tks.push(s.normal().to_string()),
}
}
Expand Down