Created
October 18, 2021 01:01
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// styling module provides a helper for building style | |
// and class attributes for elements. | |
type Styling = string | Object | Style | (() => boolean); | |
type ConditionedStyle = [string, () => boolean]; | |
export function from(...styling: Styling[]): Style { | |
return Style.from(...styling); | |
} | |
export class Style { | |
static propInt(prop: string, el: HTMLElement = document.documentElement): number { | |
return parseInt(Style.prop(prop, el), 10); | |
} | |
static prop(prop: string, el: HTMLElement = document.documentElement): string { | |
return getComputedStyle(el).getPropertyValue(prop); | |
} | |
static from(...styling: Styling[]): Style { | |
let s = new Style(); | |
s.add(...styling); | |
return s; | |
} | |
_styling: Set<ConditionedStyle>; | |
constructor() { | |
this._styling = new Set(); | |
} | |
add(...styling: Styling[]) { | |
let condition = () => true; | |
if (styling.length > 1 && isFunction(last(styling))) { | |
condition = styling.pop() as (() => boolean); | |
} | |
for (let s of styling) { | |
if (s === undefined) { | |
continue; | |
} | |
if (isFunction(s)) { | |
s = (s as Function).name; | |
} | |
this._styling.add([s as string, condition]); | |
} | |
} | |
style(): Object { | |
let style = {}; | |
let styling = filterByConditions(this._styling); | |
for (let s of styling) { | |
if (isObject(s)) { | |
style = Object.assign(style, s); | |
continue; | |
} | |
if (isStyle(s)) { | |
style = Object.assign(style, (s as Style).style()); | |
} | |
} | |
return style; | |
} | |
class(): string { | |
let classes = new Set(); | |
let styling = filterByConditions(this._styling); | |
for (let s of styling) { | |
if (isString(s)) { | |
classes.add(s); | |
continue; | |
} | |
if (isStyle(s)) { | |
for (let c of (s as Style).class().split(' ')) { | |
classes.add(c); | |
} | |
} | |
} | |
return [...classes].join(' '); | |
} | |
attrs(attrs: Object = {}): Object { | |
return Object.assign(attrs, { | |
class: this.class(), | |
style: this.style(), | |
}); | |
} | |
} | |
function filterByConditions(v: Set<any>): Array<Styling> { | |
return [...v].filter(el => el[1]()).map(el => el[0]); | |
} | |
function isString(v: any): boolean { | |
return v.constructor.name === "String"; | |
} | |
function isObject(v: any): boolean { | |
return v.constructor.name === "Object"; | |
} | |
function isStyle(v: any): boolean { | |
return v.constructor.name === "Style" && v._styling; | |
} | |
function isFunction(v: any): boolean { | |
return v.constructor.name === "Function"; | |
} | |
function last(v: Array<any>): any { | |
return v[v.length-1] | |
} |
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