66 lines
1.6 KiB
Plaintext
66 lines
1.6 KiB
Plaintext
import {
|
|
NONE,
|
|
AUTO,
|
|
NUMBER,
|
|
LENGTH,
|
|
UNSUPPORTED_LENGTH_UNIT,
|
|
PERCENT,
|
|
SPACE,
|
|
} from '../tokenTypes'
|
|
|
|
const defaultFlexGrow = 1
|
|
const defaultFlexShrink = 1
|
|
const defaultFlexBasis = 0
|
|
|
|
export default tokenStream => {
|
|
let flexGrow
|
|
let flexShrink
|
|
let flexBasis
|
|
|
|
if (tokenStream.matches(NONE)) {
|
|
tokenStream.expectEmpty()
|
|
return { flexGrow: 0, flexShrink: 0, flexBasis: 'auto' }
|
|
}
|
|
|
|
tokenStream.saveRewindPoint()
|
|
if (tokenStream.matches(AUTO) && !tokenStream.hasTokens()) {
|
|
return { flexGrow: 1, flexShrink: 1, flexBasis: 'auto' }
|
|
}
|
|
tokenStream.rewind()
|
|
|
|
let partsParsed = 0
|
|
while (partsParsed < 2 && tokenStream.hasTokens()) {
|
|
if (partsParsed !== 0) tokenStream.expect(SPACE)
|
|
|
|
if (flexGrow === undefined && tokenStream.matches(NUMBER)) {
|
|
flexGrow = tokenStream.lastValue
|
|
|
|
tokenStream.saveRewindPoint()
|
|
if (tokenStream.matches(SPACE) && tokenStream.matches(NUMBER)) {
|
|
flexShrink = tokenStream.lastValue
|
|
} else {
|
|
tokenStream.rewind()
|
|
}
|
|
} else if (
|
|
flexBasis === undefined &&
|
|
tokenStream.matches(LENGTH, UNSUPPORTED_LENGTH_UNIT, PERCENT)
|
|
) {
|
|
flexBasis = tokenStream.lastValue
|
|
} else if (flexBasis === undefined && tokenStream.matches(AUTO)) {
|
|
flexBasis = 'auto'
|
|
} else {
|
|
tokenStream.throw()
|
|
}
|
|
|
|
partsParsed += 1
|
|
}
|
|
|
|
tokenStream.expectEmpty()
|
|
|
|
if (flexGrow === undefined) flexGrow = defaultFlexGrow
|
|
if (flexShrink === undefined) flexShrink = defaultFlexShrink
|
|
if (flexBasis === undefined) flexBasis = defaultFlexBasis
|
|
|
|
return { flexGrow, flexShrink, flexBasis }
|
|
}
|