Many may have noticed that inline equations show fractions in a vertical format, which might not be very elegant when the fraction becomes longer. For example:
- $1 / 2$
- $(1 / 2) / (3 + 1)$
- $(A / (m omega^2))^2 / sqrt(B / (A + C))$
- $a + b / c$
- $(a + b) / c$
To improve this, I created a function to convert the fractions into slash style which is more readable for large fractions.
Code
let slash-frac(eq) = {
let modify(f) = {
let num = if f.num.func() == [].func() {
math.lr([\(] + f.num + [\)])
} else {
f.num
}
let denom = if f.denom.func() == [].func() {
math.lr([\(] + f.denom + [\)])
} else {
f.denom
}
return math.lr([#num #math.mid(math.class("fence", "/")) #denom])
}
// Empty
if eq.body == [] {
return eq
}
// Single Frac
if eq.body.func() == math.frac {
let args = eq.fields()
args.remove("body")
let new_eq = math.equation(
..args,
modify(eq.body),
)
return new_eq
}
// Sequence
if eq.body.func() == [].func() {
if eq.body.children.find(c => c.func() == math.frac) == none {
return eq
}
let children = eq.body.children.map(c => if c.func() == math.frac {
modify(c)
} else {
c
})
let args = eq.fields()
args.remove("body")
let new_eq = math.equation(
..args,
children.join(),
)
return new_eq
}
return eq
}
After adding
#show math.equation.where(block: false): slash-frac
the former equations would be like this
It only converts the outermost fraction and add parentheses smartly.
Update: I have created a package here
I found a bug about lr matching, and fixed it.
Feel free to report bugs & issues!