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New display-math syntax 🧮

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Changed to `$[x]$` instead of `$$x$$` because then `$$` simply is an empty formula that does not poison the whole document.
This commit is contained in:
Laurenz 2021-01-30 12:36:41 +01:00
parent 89eb8bae49
commit fe7ea53800
1 changed files with 29 additions and 18 deletions
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47
src/parse/tokens.rs
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@ -249,32 +249,38 @@ impl<'s> Tokens<'s> {
}
fn math(&mut self) -> Token<'s> {
let mut dollars = 1;
if self.s.eat_if('$') {
dollars = 2;
let mut inline = true;
if self.s.eat_if('[') {
inline = false;
}
let start = self.s.index();
let mut found = 0;
let mut escaped = false;
while found < dollars {
let mut dollar = inline;
let terminated = loop {
match self.s.eat() {
Some('$') if !escaped => found += 1,
Some('$') if !escaped && dollar => break true,
Some(']') if !escaped => dollar = true,
Some(c) => {
found = 0;
dollar = inline;
escaped = c == '\\' && !escaped;
}
None => break,
None => break false,
}
}
};
let terminated = found == dollars;
let end = self.s.index() - if terminated { found } else { 0 };
let end = self.s.index()
- match (terminated, inline) {
(false, _) => 0,
(true, true) => 1,
(true, false) => 2,
};
Token::Math(TokenMath {
formula: self.s.get(start .. end),
inline: dollars == 1,
inline,
terminated,
})
}
@ -737,16 +743,21 @@ mod tests {
#[test]
fn test_tokenize_math_formulas() {
// Test basic formula.
t!(Markup: "$x$" => Math("x", true, true));
t!(Markup: "$$x + y$$" => Math("x + y", false, true));
t!(Markup: "$$" => Math("", true, true));
t!(Markup: "$x$" => Math("x", true, true));
t!(Markup: r"$\\$" => Math(r"\\", true, true));
t!(Markup: "$[x + y]$" => Math("x + y", false, true));
t!(Markup: r"$[\\]$" => Math(r"\\", false, true));
// Test unterminated.
t!(Markup[""]: "$$x" => Math("x", false, false));
t!(Markup[""]: "$$x$\n$" => Math("x$\n$", false, false));
t!(Markup[""]: "$x" => Math("x", true, false));
t!(Markup[""]: "$[x" => Math("x", false, false));
t!(Markup[""]: "$[x]\n$" => Math("x]\n$", false, false));
// Test escape sequences.
t!(Markup: r"$$\\\$$$" => Math(r"\\\$", false, true));
t!(Markup[""]: r"$$ $\\$" => Math(r" $\\$", false, false));
t!(Markup: r"$\$x$" => Math(r"\$x", true, true));
t!(Markup: r"$[\\\]$]$" => Math(r"\\\]$", false, true));
t!(Markup[""]: r"$[ ]\\$" => Math(r" ]\\$", false, false));
}
#[test]