//  fork from element-plus  and rewrite
@use 'sass:meta';
@use 'sass:string';

@use './config' as config;

// BEM support Func
@function selectorToString($selector) {
  $selector: meta.inspect($selector);
  $selector: string.slice($selector, 2, -2);
  @return $selector;
}

@function containsModifier($selector) {
  $selector: selectorToString($selector);

  @if string.index($selector, config.$plus-modifier-separator) {
    @return true;
  } @else {
    @return false;
  }
}

@function containWhenFlag($selector) {
  $selector: selectorToString($selector);

  @if string.index($selector, '.' + config.$plus-state-prefix) {
    @return true;
  } @else {
    @return false;
  }
}

@function containPseudoClass($selector) {
  $selector: selectorToString($selector);

  @if string.index($selector, ':') {
    @return true;
  } @else {
    @return false;
  }
}

@function hitAllSpecialNestRule($selector) {
  @return containsModifier($selector) or containWhenFlag($selector) or containPseudoClass($selector);
}

// join var name
// joinVarName(('button', 'text-color')) => '--el-button-text-color'
@function joinVarName($list) {
  $name: '--' + config.$el-namespace;
  @each $item in $list {
    @if $item != '' {
      $name: $name + '-' + $item;
    }
  }
  @return $name;
}

// getCssVarName('button', 'text-color') => '--el-button-text-color'
@function getCssVarName($args...) {
  @return joinVarName($args);
}

// getCssVar('button', 'text-color') => var(--el-button-text-color)
@function getCssVar($args...) {
  @return var(#{joinVarName($args)});
}

// getCssVarWithDefault(('button', 'text-color'), red) => var(--el-button-text-color, red)
@function getCssVarWithDefault($args, $default) {
  @return var(#{joinVarName($args)}, #{$default});
}