Revert naked binaryOp at the start of a selector within :has() (estoo…

…ls#145)

This reverts most of commit 00448e0.

esquery.js

@@ -127,11 +127,6 @@ function generateMatcher(selector) {
             };
         }
 
-        case 'exactNode':
-            return (node, ancestry) => {
-                return ancestry.length === 0;
-            };
-
         case 'field': {
             const path = selector.name.split('.');
             return (node, ancestry) => {

grammar.pegjs

@@ -30,21 +30,10 @@ binaryOp
   / _ "+" _ { return 'adjacent'; }
   / " " _ { return 'descendant'; }
 
-hasSelectors = s:hasSelector ss:(_ "," _ hasSelector)* {
-  return [s].concat(ss.map(function (s) { return s[3]; }));
-}
-
 selectors = s:selector ss:(_ "," _ selector)* {
   return [s].concat(ss.map(function (s) { return s[3]; }));
 }
 
-
-hasSelector
-  = op:binaryOp? s:selector {
-    if (!op) return s;
-    return { type: op, left: { type: 'exactNode' }, right: s };
-  }
-
 selector
   = a:sequence ops:(binaryOp sequence)* {
     return ops.reduce(function (memo, rhs) {
@@ -107,7 +96,7 @@ field = "." i:identifierName is:("." identifierName)* {
 
 negation = ":not(" _ ss:selectors _ ")" { return { type: 'not', selectors: ss }; }
 matches = ":matches(" _ ss:selectors _ ")" { return { type: 'matches', selectors: ss }; }
-has = ":has(" _ ss:hasSelectors _ ")" { return { type: 'has', selectors: ss }; }
+has = ":has(" _ ss:selectors _ ")" { return { type: 'has', selectors: ss }; }
 
 firstChild = ":first-child" { return nth(1); }
 lastChild = ":last-child" { return nthLast(1); }