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var minus = '-'.charCodeAt(0)
var plus = '+'.charCodeAt(0)
var dot = '.'.charCodeAt(0)
var exp = 'e'.charCodeAt(0)
var EXP = 'E'.charCodeAt(0)
// Check if three code points would start a number
// https://www.w3.org/TR/css-syntax-3/#starts-with-a-number
function likeNumber(value) {
var code = value.charCodeAt(0)
var nextCode
if (code === plus || code === minus) {
nextCode = value.charCodeAt(1)
if (nextCode >= 48 && nextCode <= 57) {
return true
}
var nextNextCode = value.charCodeAt(2)
if (nextCode === dot && nextNextCode >= 48 && nextNextCode <= 57) {
return true
}
return false
}
if (code === dot) {
nextCode = value.charCodeAt(1)
if (nextCode >= 48 && nextCode <= 57) {
return true
}
return false
}
if (code >= 48 && code <= 57) {
return true
}
return false
}
// Consume a number
// https://www.w3.org/TR/css-syntax-3/#consume-number
module.exports = function (value) {
var pos = 0
var length = value.length
var code
var nextCode
var nextNextCode
if (length === 0 || !likeNumber(value)) {
return false
}
code = value.charCodeAt(pos)
if (code === plus || code === minus) {
pos++
}
while (pos < length) {
code = value.charCodeAt(pos)
if (code < 48 || code > 57) {
break
}
pos += 1
}
code = value.charCodeAt(pos)
nextCode = value.charCodeAt(pos + 1)
if (code === dot && nextCode >= 48 && nextCode <= 57) {
pos += 2
while (pos < length) {
code = value.charCodeAt(pos)
if (code < 48 || code > 57) {
break
}
pos += 1
}
}
code = value.charCodeAt(pos)
nextCode = value.charCodeAt(pos + 1)
nextNextCode = value.charCodeAt(pos + 2)
if (
(code === exp || code === EXP) &&
((nextCode >= 48 && nextCode <= 57) ||
((nextCode === plus || nextCode === minus) && nextNextCode >= 48 && nextNextCode <= 57))
) {
pos += nextCode === plus || nextCode === minus ? 3 : 2
while (pos < length) {
code = value.charCodeAt(pos)
if (code < 48 || code > 57) {
break
}
pos += 1
}
}
return {
number: value.slice(0, pos),
unit: value.slice(pos),
}
}
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