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import {Atlas} from '../types/Atlas'
import {Rect} from '../types/Rect'
import {WH} from '../types/WH'
import {XY} from '../types/XY'
export namespace Parser {
export function parse(file: Aseprite.File): Atlas {
return Object.freeze({
version: file.meta.version,
filename: file.meta.image,
format: file.meta.format,
size: file.meta.size,
animations: parseAnimationRecord(file)
})
}
/** @internal */
export function parseAnimationRecord({
meta,
frames
}: Aseprite.File): Atlas.AnimationRecord {
const {frameTags, slices} = meta
const record = Object.freeze(
frameTags.reduce((atlas, frameTag) => {
// Every tag should be unique within the sheet.
Iif (frameTag.name in atlas)
throw new Error(`Duplicate tag "${frameTag.name}".`)
return {
...atlas,
[frameTag.name]: parseAnimation(frameTag, frames, slices)
}
}, {})
)
return record
}
/** @internal */
export function parseAnimation(
frameTag: Aseprite.FrameTag,
frameMap: Aseprite.FrameMap,
slices: readonly Aseprite.Slice[]
): Atlas.Animation {
const frames = tagFrames(frameTag, frameMap)
const cels = frames.map((frame, i) => parseCel(frameTag, frame, i, slices))
let duration = cels.reduce((time, {duration}) => time + duration, 0)
const pingPong = frameTag.direction === Aseprite.AnimationDirection.PingPong
Iif (pingPong && cels.length > 2)
duration +=
duration - (cels[0]!.duration + cels[cels.length - 1]!.duration)
Iif (!cels.length)
throw new Error(`"${frameTag.name}" animation missing cels.`)
Iif (duration <= 0)
throw new Error(
`Total duration for "${frameTag.name}" animation is non-positive.`
)
Iif (
cels
.slice(0, -1)
.some(({duration}) => duration === Number.POSITIVE_INFINITY)
)
throw new Error(
`Intermediate cel has infinite duration for "${frameTag.name}" animation.`
)
const {w, h} = frames[0]!.sourceSize
return {
size: Object.freeze({w, h}),
cels: Object.freeze(cels),
duration,
direction: parseAnimationDirection(frameTag)
}
}
function tagFrames(
{name, from, to}: Aseprite.FrameTag,
frameMap: Aseprite.FrameMap
): readonly Aseprite.Frame[] {
const frames = []
for (; from <= to; ++from) {
const frame = frameMap[`${name} ${from}`]
Iif (!frame) throw new Error(`Missing frame "${name} ${from}".`)
frames.push(frame)
}
return frames
}
/** @internal */
export function parseAnimationDirection({
direction
}: Aseprite.FrameTag): Aseprite.AnimationDirection {
Eif (isAnimationDirection(direction)) return direction
throw new Error(`"${direction}" is not a Direction.`)
}
/** @internal */
export function isAnimationDirection(
direction: string
): direction is Aseprite.AnimationDirection {
const directions = Object.values(Aseprite.AnimationDirection)
return directions.includes(<Aseprite.AnimationDirection>direction)
}
/** @internal */
export function parseCel(
frameTag: Aseprite.FrameTag,
frame: Aseprite.Frame,
frameNumber: number,
slices: readonly Aseprite.Slice[]
): Atlas.Cel {
return Object.freeze({
position: parsePosition(frame),
duration: parseDuration(frame.duration),
slices: parseSlices(frameTag, frameNumber, slices)
})
}
/** @internal */
export function parsePosition(frame: Aseprite.Frame): Readonly<XY> {
const padding = parsePadding(frame)
return Object.freeze({
x: frame.frame.x + padding.w / 2,
y: frame.frame.y + padding.h / 2
})
}
/** @internal */
export function parsePadding({
frame,
sourceSize
}: Aseprite.Frame): Readonly<WH> {
return Object.freeze({w: frame.w - sourceSize.w, h: frame.h - sourceSize.h})
}
/** @internal */
export function parseDuration(duration: Aseprite.Duration): number {
Iif (!duration) throw new Error('Expected positive cel duration.')
return duration === Aseprite.Infinite ? Number.POSITIVE_INFINITY : duration
}
/** @internal */
export function parseSlices(
{name}: Aseprite.FrameTag,
index: number,
slices: readonly Aseprite.Slice[]
): readonly Readonly<Rect>[] {
const tagBounds = []
for (const slice of slices) {
// Ignore Slices not for this Tag.
if (slice.name !== name) continue
// Get the greatest relevant Key.
const key = slice.keys.filter(key => key.frame <= index).slice(-1)[0]
Iif (!key) throw new Error(`No Keys for Tag "${slice.name}".`)
tagBounds.push(key.bounds)
}
return Object.freeze(tagBounds)
}
}
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