// Bundle the AM mixins.
// http://less2css.org/
#venus {
  // define alll availble mixins within .namespace().
  .namespace(@_namespace:'v') {

    // Expose the variable.
    @empty-rule-set:{};
    @namespace: @_namespace;

    .trait(@_trait; @ruleset) {
      @trait: @_trait;
      @traitAttribute: ~'@{namespace}';
      @traitSelector: ~'[@{traitAttribute}~="@{trait}"]';
      @selector: @traitSelector;
      ._scope(@selector, @ruleset);
    }

    .module(@_module) {
      @module: @_module;
      @moduleAttribute: ~'@{namespace}-@{module}';
      @moduleSelector: ~'[@{moduleAttribute}]';
    }
    //
    .amSelector(@variant, @attribute, @selectorNew:'', @i:1) when(length(@variant)+1>=@i) {
      @extractVariant: extract(@variant, @i);
      .amSelector(@variant, @attribute, ~'@{selectorNew}[@{attribute}~="@{extractVariant}"]', (@i+1));
      .assign(@i, @variant) when (@i=1+length(@variant)) {
        @selector:~'@{selectorNew}';
      }
      .assign(@i, @variant);
    }
    
    .module(@_module; @ruleset) {
      .module(@_module);
      // @selector is available as a shorthand for @moduleSelector,
      // that's only useful if the module is appropriately scoped.
      @selector: @moduleSelector;
      ._scope(@selector, @ruleset);
    }

    .variant(@_variant; @ruleset) {
      // return @selector definition
      .amSelector(@_variant, @moduleAttribute);
      ._scope(@selector, @ruleset);
    }
    .child(@_child; @ruleset:@empty-rule-set) {
      @child: @_child;
      @childAttribute: ~'@{moduleAttribute}-@{child}';
      @childSelector: ~'[@{childAttribute}]';
      @selector: @childSelector;
      ._scope(@selector, @ruleset);

      .variant(@_variant; @ruleset) {
        // return @selector definition
        .amSelector(@_variant, @childAttribute);
        ._scope(@selector, @ruleset);
      }
    }

    ._scope(@selector, @ruleset) {
      @{selector} {
        @ruleset();
      }
    }
  }
}