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import React from 'react'
import {StyleProp, TextProps as RNTextProps, TextStyle} from 'react-native'
import {UITextView} from 'react-native-uitextview'
import createEmojiRegex from 'emoji-regex'
import {logger} from '#/logger'
import {isIOS, isNative} from '#/platform/detection'
import {Alf, applyFonts, atoms, flatten, useAlf, useTheme, web} from '#/alf'
import {IS_DEV} from '#/env'
export type StringChild = string | (string | null)[]
export type TextProps = Omit<RNTextProps, 'children'> & {
/**
* Lets the user select text, to use the native copy and paste functionality.
*/
selectable?: boolean
/**
* Provides `data-*` attributes to the underlying `UITextView` component on
* web only.
*/
dataSet?: Record<string, string | number | undefined>
/**
* Appears as a small tooltip on web hover.
*/
title?: string
} & (
| {
emoji?: true
children: StringChild
}
| {
emoji?: false
children: RNTextProps['children']
}
)
const EMOJI = createEmojiRegex()
export function childHasEmoji(children: React.ReactNode) {
return (Array.isArray(children) ? children : [children]).some(
child => typeof child === 'string' && createEmojiRegex().test(child),
)
}
export function childIsString(
children: React.ReactNode,
): children is StringChild {
return (
typeof children === 'string' ||
(Array.isArray(children) &&
children.every(child => typeof child === 'string' || child === null))
)
}
export function renderChildrenWithEmoji(
children: StringChild,
props: Omit<TextProps, 'children'> = {},
) {
const normalized = Array.isArray(children) ? children : [children]
return (
<UITextView {...props}>
{normalized.map(child => {
if (typeof child !== 'string') return child
const emojis = child.match(EMOJI)
if (emojis === null) {
return child
}
return child.split(EMOJI).map((stringPart, index) => (
<UITextView key={index} {...props}>
{stringPart}
{emojis[index] ? (
<UITextView
{...props}
style={[props?.style, {color: 'black', fontFamily: 'System'}]}>
{emojis[index]}
</UITextView>
) : null}
</UITextView>
))
})}
</UITextView>
)
}
/**
* Util to calculate lineHeight from a text size atom and a leading atom
*
* Example:
* `leading(atoms.text_md, atoms.leading_normal)` // => 24
*/
export function leading<
Size extends {fontSize?: number},
Leading extends {lineHeight?: number},
>(textSize: Size, leading: Leading) {
const size = textSize?.fontSize || atoms.text_md.fontSize
const lineHeight = leading?.lineHeight || atoms.leading_normal.lineHeight
return Math.round(size * lineHeight)
}
/**
* Ensures that `lineHeight` defaults to a relative value of `1`, or applies
* other relative leading atoms.
*
* If the `lineHeight` value is > 2, we assume it's an absolute value and
* returns it as-is.
*/
export function normalizeTextStyles(
styles: StyleProp<TextStyle>,
{
fontScale,
fontFamily,
}: {
fontScale: number
fontFamily: Alf['fonts']['family']
} & Pick<Alf, 'flags'>,
) {
const s = flatten(styles)
// should always be defined on these components
s.fontSize = (s.fontSize || atoms.text_md.fontSize) * fontScale
if (s?.lineHeight) {
if (s.lineHeight !== 0 && s.lineHeight <= 2) {
s.lineHeight = Math.round(s.fontSize * s.lineHeight)
}
} else if (!isNative) {
s.lineHeight = s.fontSize
}
applyFonts(s, fontFamily)
return s
}
/**
* Our main text component. Use this most of the time.
*/
export function Text({
children,
emoji,
style,
selectable,
title,
dataSet,
...rest
}: TextProps) {
const {fonts, flags} = useAlf()
const t = useTheme()
const s = normalizeTextStyles([atoms.text_sm, t.atoms.text, flatten(style)], {
fontScale: fonts.scaleMultiplier,
fontFamily: fonts.family,
flags,
})
if (IS_DEV) {
if (!emoji && childHasEmoji(children)) {
logger.warn(
`Text: emoji detected but emoji not enabled: "${children}"\n\nPlease add <Text emoji />'`,
)
}
if (emoji && !childIsString(children)) {
logger.error('Text: when <Text emoji />, children can only be strings.')
}
}
const shared = {
uiTextView: true,
selectable,
style: s,
dataSet: Object.assign({tooltip: title}, dataSet || {}),
...rest,
}
return (
<UITextView {...shared}>
{isIOS && emoji ? renderChildrenWithEmoji(children, shared) : children}
</UITextView>
)
}
export function createHeadingElement({level}: {level: number}) {
return function HeadingElement({style, ...rest}: TextProps) {
const attr =
web({
role: 'heading',
'aria-level': level,
}) || {}
return <Text {...attr} {...rest} style={style} />
}
}
/*
* Use semantic components when it's beneficial to the user or to a web scraper
*/
export const H1 = createHeadingElement({level: 1})
export const H2 = createHeadingElement({level: 2})
export const H3 = createHeadingElement({level: 3})
export const H4 = createHeadingElement({level: 4})
export const H5 = createHeadingElement({level: 5})
export const H6 = createHeadingElement({level: 6})
export function P({style, ...rest}: TextProps) {
const attr =
web({
role: 'paragraph',
}) || {}
return (
<Text
{...attr}
{...rest}
style={[atoms.text_md, atoms.leading_normal, flatten(style)]}
/>
)
}
|
