Method _scopeSelectorPart

packages/compiler/src/shadow_css.ts:747–772

(p: string)

    const attrName = `[${scopeSelector}]`;

    const _scopeSelectorPart = (p: string) => {
      let scopedP = p.trim();

      if (!scopedP) {
        return p;
      }

      if (p.includes(_polyfillHostNoCombinator)) {
        scopedP = this._applySimpleSelectorScope(p, scopeSelector, hostSelector);
        if (!p.match(_polyfillHostNoCombinatorOutsidePseudoFunction)) {
          const [_, before, colon, after] = scopedP.match(/([^:]*)(:*)([\s\S]*)/)!;
          scopedP = before + attrName + colon + after;
        }
      } else {
        // remove :host since it should be unnecessary
        const t = p.replace(_polyfillHostRe, '');
        if (t.length > 0) {
          const matches = t.match(/([^:]*)(:*)([\s\S]*)/);
          if (matches) {
            scopedP = matches[1] + attrName + matches[2] + matches[3];
          }
        }
      }

      return scopedP;
    };

    // Wraps `_scopeSelectorPart()` to not use it directly on selectors with
    // pseudo selector functions like `:where()`. Selectors within pseudo selector