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rOACCT/node_modules/jss/src/utils/toCss.js
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toCss.js
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			import toCssValue from './toCssValue'
			import getWhitespaceSymbols from './getWhitespaceSymbols'

			/**
			* Indent a string.
			* http://jsperf.com/array-join-vs-for
			*/
			function indentStr(str, indent) {
			let result = ''
			for (let index = 0; index < indent; index++) result += ' '
			return result + str
			}

			/**
			* Converts a Rule to CSS string.
			*/
			export default function toCss(selector, style, options = {}) {
			let result = ''

			if (!style) return result

			let {indent = 0} = options
			const {fallbacks} = style

			if (options.format === false) {
			indent = -Infinity
			}
			const {linebreak, space} = getWhitespaceSymbols(options)

			if (selector) indent++

			// Apply fallbacks first.
			if (fallbacks) {
			// Array syntax {fallbacks: [{prop: value}]}
			if (Array.isArray(fallbacks)) {
			for (let index = 0; index < fallbacks.length; index++) {
			const fallback = fallbacks[index]
			for (const prop in fallback) {
			const value = fallback[prop]
			if (value != null) {
			if (result) result += linebreak
			result += indentStr(`${prop}:${space}${toCssValue(value)};`, indent)
			}
			}
			}
			} else {
			// Object syntax {fallbacks: {prop: value}}
			for (const prop in fallbacks) {
			const value = fallbacks[prop]
			if (value != null) {
			if (result) result += linebreak
			result += indentStr(`${prop}:${space}${toCssValue(value)};`, indent)
			}
			}
			}
			}

			for (const prop in style) {
			const value = style[prop]
			if (value != null && prop !== 'fallbacks') {
			if (result) result += linebreak
			result += indentStr(`${prop}:${space}${toCssValue(value)};`, indent)
			}
			}

			// Allow empty style in this case, because properties will be added dynamically.
			if (!result && !options.allowEmpty) return result

			// When rule is being stringified before selector was defined.
			if (!selector) return result

			indent--

			if (result) result = `${linebreak}${result}${linebreak}`

			return indentStr(`${selector}${space}{${result}`, indent) + indentStr('}', indent)
			}