exam_student/uni_modules/lime-style/mixins/create.scss

@function to-number($string) {
   $result: 0;
   $is-negative: str-slice($string, 1, 1) == '-';
   $length: str-length($string);
   
   @if $is-negative {
       $string: str-slice($string, 2);
       $length: $length - 1;
    }
	
	$decimal-index: str-index($string, '.');
	
	@if $decimal-index {
		$decimal-str: str-slice($string, $decimal-index + 1);
		$decimal-length: str-length($decimal-str);
		$length: $length - $decimal-length - 1;
		$string: str-slice($string, 1, $decimal-index - 1);
		
		$result: to-number($decimal-str) * pow(10, $decimal-length * -1);
	}
   $numbers:(
	'0': 0,
	'1': 1,
	'2': 2,
	'3': 3,
	'4': 4,
	'5': 5,
	'6': 6,
	'7': 7,
	'8': 8,
	'9': 9,
   );
	
	@for $i from 1 through $length {
		$key: str-slice($string, $i, $i);
		$number: map-get($numbers, $key);
		$digit: if($number == 0, 0, if($length - $i > 0, pow(10, $length - $i), 0));
		$result: $result + $digit * $number + if($length - $i == 0, $number, 0);
	}
	@return if($is-negative, $result * -1, $result) ;
}

// 由于vue2 h5和app不支持动态rpx 故转成px
@function rpx-to-px($rpx-string) {
	@if type-of($rpx-string) == list {
		$new-list: ();
		@each $value in $rpx-string {
			$v: $value + '';
			$start: str-index($v, 'rpx');
			@if $start {
				 $new-list: append($new-list, rpx-to-px($v));
			} @else {
				$new-list: append($new-list, $value);
			}
		}
		@return $new-list;
	}
	
	@if type-of($rpx-string) == number and comparable($rpx-string, 1rpx) {
		@return rpx-to-px($rpx-string + '');
	}
	
	@if type-of($rpx-string) != string {
	   @return $rpx-string;
	}
	$start: str-index($rpx-string, 'rpx');
	$number-map: (
		'-': 1,
		'0': 1,
		'1': 1,
		'2': 1,
		'3': 1,
		'4': 1,
		'5': 1,
		'6': 1,
		'7': 1,
		'8': 1,
		'9': 1,
	   );
	@if not $start {
	  @return $rpx-string;
	}
	$result: '';
	@while $start {
		// 获取 'rpx' 前的数字
		$number-end: $start - 1;
		$number-start: $number-end;
		@while $number-start > 0 and map-get($number-map, str-slice($rpx-string, $number-start, $number-start)) ==1 {
			$number-start: $number-start - 1;
		}
		// 提取数字部分
		$number: to-number(str-slice($rpx-string, $number-start + 1, $number-end));
		
		// 转换 'rpx' 到 'px'
		$px-value: ($number / 2) + 'px';
		$result: $result + str-slice($rpx-string, 0, $number-start) + $px-value;
		
		// 更新字符串和起始位置
		$rpx-string: str-slice($rpx-string, $start + 3);
		$start: str-index($rpx-string, 'rpx');
	}
	
	@return $result + $rpx-string;
}

@function create-var($name, $values...) {
	// 将不定数量的参数转换为列表
	$value-list: $values;
	$css-value: null;
	@if length($value-list) == 0 {
		@warn "The list must have at least 1 values.";
	} @else {
		// 初始化CSS变量的值为列表中的第一个值
		/* #ifdef VUE2 */
		$css-value: rpx-to-px(nth($value-list, 1));
		/* #endif */
		/* #ifndef VUE2 */
		$css-value: nth($value-list, 1);
		/* #endif */
	}
	// 检查列表长度是否大于等于2
	@if length($value-list) >= 2 {
	    // 使用@for循环遍历剩余的值，并构建CSS变量的完整值
	    @for $i from 2 through length($value-list) {
			/* #ifdef VUE2 */
			$css-value: $css-value + ", " + rpx-to-px(nth($value-list, $i));
			/* #endif */
			/* #ifndef VUE2 */
			$css-value: $css-value + ", " + nth($value-list, $i);
			/* #endif */
	    }
	}
	
	// APP-ANDROID || APP-IOS
	/* #ifndef APP-NVUE || UNI-APP-X && APP */
	@return var(--l-#{$name}, #{$css-value});
	/* #endif */
	/* #ifdef APP-NVUE || UNI-APP-X && APP */
	@return $css-value;
	/* #endif */
}