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const LOWER_A = 0x61
const LOWER_Z = 0x7a
const UPPER_A = 0x41
const UPPER_Z = 0x5a
const LOWER_E = 0x65
const UPPER_E = 0x45
const ZERO = 0x30
const NINE = 0x39
const ADD = 0x2b
const SUB = 0x2d
const MUL = 0x2a
const DIV = 0x2f
const OPEN_PAREN = 0x28
const CLOSE_PAREN = 0x29
const COMMA = 0x2c
const SPACE = 0x20
const PERCENT = 0x25
const MATH_FUNCTIONS = [
'calc',
'min',
'max',
'clamp',
'mod',
'rem',
'sin',
'cos',
'tan',
'asin',
'acos',
'atan',
'atan2',
'pow',
'sqrt',
'hypot',
'log',
'exp',
'round',
]
export function hasMathFn(input: string) {
return input.indexOf('(') !== -1 && MATH_FUNCTIONS.some((fn) => input.includes(`${fn}(`))
}
export function addWhitespaceAroundMathOperators(input: string) {
// Bail early if there are no math functions in the input
if (!MATH_FUNCTIONS.some((fn) => input.includes(fn))) {
return input
}
let result = ''
let formattable: boolean[] = []
let valuePos = null
let lastValuePos = null
for (let i = 0; i < input.length; i++) {
let char = input.charCodeAt(i)
// Track if we see a number followed by a unit, then we know for sure that
// this is not a function call.
if (char >= ZERO && char <= NINE) {
valuePos = i
}
// If we saw a number before, and we see normal a-z character, then we
// assume this is a value such as `123px`
else if (
valuePos !== null &&
(char === PERCENT ||
(char >= LOWER_A && char <= LOWER_Z) ||
(char >= UPPER_A && char <= UPPER_Z))
) {
valuePos = i
}
// Once we see something else, we reset the value position
else {
lastValuePos = valuePos
valuePos = null
}
// Determine if we're inside a math function
if (char === OPEN_PAREN) {
result += input[i]
// Scan backwards to determine the function name. This assumes math
// functions are named with lowercase alphanumeric characters.
let start = i
for (let j = i - 1; j >= 0; j--) {
let inner = input.charCodeAt(j)
if (inner >= ZERO && inner <= NINE) {
start = j // 0-9
} else if (inner >= LOWER_A && inner <= LOWER_Z) {
start = j // a-z
} else {
break
}
}
let fn = input.slice(start, i)
// This is a known math function so start formatting
if (MATH_FUNCTIONS.includes(fn)) {
formattable.unshift(true)
continue
}
// We've encountered nested parens inside a math function, record that and
// keep formatting until we've closed all parens.
else if (formattable[0] && fn === '') {
formattable.unshift(true)
continue
}
// This is not a known math function so don't format it
formattable.unshift(false)
continue
}
// We've exited the function so format according to the parent function's
// type.
else if (char === CLOSE_PAREN) {
result += input[i]
formattable.shift()
}
// Add spaces after commas in math functions
else if (char === COMMA && formattable[0]) {
result += `, `
continue
}
// Skip over consecutive whitespace
else if (char === SPACE && formattable[0] && result.charCodeAt(result.length - 1) === SPACE) {
continue
}
// Add whitespace around operators inside math functions
else if ((char === ADD || char === MUL || char === DIV || char === SUB) && formattable[0]) {
let trimmed = result.trimEnd()
let prev = trimmed.charCodeAt(trimmed.length - 1)
let prevPrev = trimmed.charCodeAt(trimmed.length - 2)
let next = input.charCodeAt(i + 1)
// Do not add spaces for scientific notation, e.g.: `-3.4e-2`
if ((prev === LOWER_E || prev === UPPER_E) && prevPrev >= ZERO && prevPrev <= NINE) {
result += input[i]
continue
}
// If we're preceded by an operator don't add spaces
else if (prev === ADD || prev === MUL || prev === DIV || prev === SUB) {
result += input[i]
continue
}
// If we're at the beginning of an argument don't add spaces
else if (prev === OPEN_PAREN || prev === COMMA) {
result += input[i]
continue
}
// Add spaces only after the operator if we already have spaces before it
else if (input.charCodeAt(i - 1) === SPACE) {
result += `${input[i]} `
}
// Add spaces around the operator, if...
else if (
// Previous is a digit
(prev >= ZERO && prev <= NINE) ||
// Next is a digit
(next >= ZERO && next <= NINE) ||
// Previous is end of a function call (or parenthesized expression)
prev === CLOSE_PAREN ||
// Next is start of a parenthesized expression
next === OPEN_PAREN ||
// Next is an operator
next === ADD ||
next === MUL ||
next === DIV ||
next === SUB ||
// Previous position was a value (+ unit)
(lastValuePos !== null && lastValuePos === i - 1)
) {
result += ` ${input[i]} `
}
// Everything else
else {
result += input[i]
}
}
// Handle all other characters
else {
result += input[i]
}
}
return result
}