Added support for descendent, >, ~, and + (#217)

docs/api/selector.md

@@ -40,17 +40,16 @@ input#input-name
 label[foo=true]
 ```
 
-Are all valid selectors in enzyme.  At this time, however, any contextual CSS selector syntax that
-requires knowledge of a node's ancestors or siblings is not yet supported.  For instance:
+Enzyme also gives support for the following contextual selectors
 
 ```
 .foo .bar
 .foo > .bar
+.foo + .bar
+.foo ~ .bar
 .foo input
 ```
 
-Are all unsupported selectors in enzyme.
-
 
 **Want more CSS support?**
 

src/ComplexSelector.js

@@ -0,0 +1,125 @@
+import split from 'lodash/split';
+
+export default class ComplexSelector {
+  constructor(buildPredicate, findWhereUnwrapped, childrenOfNode) {
+    this.buildPredicate = buildPredicate;
+    this.findWhereUnwrapped = findWhereUnwrapped;
+    this.childrenOfNode = childrenOfNode;
+  }
+
+  getSelectors(selector) {
+    const cleaned = selector.replace(/\s{2,}/g, ' ');
+    const selectors = split(cleaned, ' ');
+    return selectors.reduce((list, sel) => {
+      if (sel === '+' || sel === '~') {
+        const temp = list.pop();
+        list.push(sel, temp);
+        return list;
+      }
+
+      list.push(sel);
+      return list;
+    }, []);
+  }
+
+  handleSelectors(selectors, wrapper) {
+    const recurseSelector = (offset, fn, pre) => {
+      const predicate = pre || this.buildPredicate(selectors[offset]);
+      const nextWrapper = this.findWhereUnwrapped(wrapper, predicate, fn);
+      const nextSelectors = selectors.slice(offset + 1);
+      return this.handleSelectors(nextSelectors, nextWrapper);
+    };
+
+    const buildSiblingPredicate = (first, second) => {
+      const firstPredicate = this.buildPredicate(first);
+      const secondPredicate = this.buildPredicate(second);
+
+      return (child) => {
+        if (firstPredicate(child)) {
+          return (sibling) => secondPredicate(sibling);
+        }
+
+        return false;
+      };
+    };
+
+    let predicate;
+    let selectSiblings;
+
+    if (selectors.length) {
+      switch (selectors[0]) {
+        case '>':
+          return recurseSelector(1, this.treeFilterDirect());
+        case '+':
+          predicate = buildSiblingPredicate(selectors[1], selectors[2]);
+          selectSiblings = (children, pre, results, idx) => {
+            const adjacent = children[idx + 1];
+            if (pre(adjacent)) { results.push(adjacent); }
+          };
+
+          return recurseSelector(2, this.treeFindSiblings(selectSiblings), predicate);
+        case '~':
+          predicate = buildSiblingPredicate(selectors[1], selectors[2]);
+          selectSiblings = (children, pre, results, idx) =>
+            children.slice(idx + 1).map(child =>
+              (pre(child) ? results.push(child) : null)
+            );
+
+          return recurseSelector(2, this.treeFindSiblings(selectSiblings), predicate);
+        default:
+          return recurseSelector(0);
+      }
+    }
+
+    return wrapper;
+  }
+
+  find(selector, wrapper) {
+    if (typeof selector === 'string') {
+      const selectors = this.getSelectors(selector);
+
+      return this.handleSelectors(selectors, wrapper);
+    }
+
+    const predicate = this.buildPredicate(selector);
+    return this.findWhereUnwrapped(wrapper, predicate);
+  }
+
+  treeFilterDirect() {
+    return (tree, fn) => {
+      const results = [];
+      this.childrenOfNode(tree).forEach(child => {
+        if (fn(child)) {
+          results.push(child);
+        }
+      });
+
+      return results;
+    };
+  }
+
+  treeFindSiblings(selectSiblings) {
+    return (tree, fn) => {
+      const results = [];
+      const list = [this.childrenOfNode(tree)];
+
+      const traverseChildren = (children) =>
+        children.forEach((child, i) => {
+          const secondPredicate = fn(child);
+
+          list.push(this.childrenOfNode(child));
+
+          if (secondPredicate) {
+            selectSiblings(children, secondPredicate, results, i);
+          }
+        });
+
+      while (list.length) {
+        traverseChildren(list.shift());
+      }
+
+      return results;
+    };
+  }
+
+}

src/MountedTraversal.js

@@ -6,9 +6,7 @@ import {
   nodeEqual,
   propsOfNode,
   isFunctionalComponent,
-  isSimpleSelector,
   splitSelector,
-  selectorError,
   selectorType,
   isCompoundSelector,
   AND,
@@ -208,9 +206,6 @@ export function buildInstPredicate(selector) {
       return inst => instHasType(inst, selector);
 
     case 'string':
-      if (!isSimpleSelector(selector)) {
-        throw selectorError(selector);
-      }
       if (isCompoundSelector.test(selector)) {
         return AND(splitSelector(selector).map(buildInstPredicate));
       }

src/ReactWrapper.js

@@ -1,4 +1,5 @@
 import React from 'react';
+import ComplexSelector from './ComplexSelector';
 import cheerio from 'cheerio';
 import flatten from 'lodash/flatten';
 import unique from 'lodash/uniq';
@@ -35,10 +36,11 @@ import {
  *
  * @param {ReactWrapper} wrapper
  * @param {Function} predicate
+ * @param {Function} filter
  * @returns {ReactWrapper}
  */
-function findWhereUnwrapped(wrapper, predicate) {
-  return wrapper.flatMap(n => treeFilter(n.node, predicate));
+function findWhereUnwrapped(wrapper, predicate, filter = treeFilter) {
+  return wrapper.flatMap(n => filter(n.node, predicate));
 }
 
 /**
@@ -91,6 +93,11 @@ export default class ReactWrapper {
       this.length = this.nodes.length;
     }
     this.options = options;
+    this.complexSelector = new ComplexSelector(
+      buildInstPredicate,
+      findWhereUnwrapped,
+      childrenOfInst
+    );
   }
 
   /**
@@ -270,8 +277,7 @@ export default class ReactWrapper {
    * @returns {ReactWrapper}
    */
   find(selector) {
-    const predicate = buildInstPredicate(selector);
-    return findWhereUnwrapped(this, predicate);
+    return this.complexSelector.find(selector, this);
   }
 
   /**
@@ -641,7 +647,8 @@ export default class ReactWrapper {
     const nodes = this.nodes.map((n, i) => fn.call(this, this.wrap(n), i));
     const flattened = flatten(nodes, true);
     const uniques = unique(flattened);
-    return this.wrap(uniques);
+    const compacted = compact(uniques);
+    return this.wrap(compacted);
   }
 
   /**

src/ShallowTraversal.js

@@ -4,9 +4,7 @@ import isSubset from 'is-subset';
 import {
   coercePropValue,
   propsOfNode,
-  isSimpleSelector,
   splitSelector,
-  selectorError,
   isCompoundSelector,
   selectorType,
   AND,
@@ -117,9 +115,6 @@ export function buildPredicate(selector) {
       return node => node && node.type === selector;
 
     case 'string':
-      if (!isSimpleSelector(selector)) {
-        throw selectorError(selector);
-      }
       if (isCompoundSelector.test(selector)) {
         return AND(splitSelector(selector).map(buildPredicate));
       }

src/ShallowWrapper.js

@@ -1,4 +1,5 @@
 import React from 'react';
+import ComplexSelector from './ComplexSelector';
 import flatten from 'lodash/flatten';
 import unique from 'lodash/uniq';
 import compact from 'lodash/compact';
@@ -33,10 +34,11 @@ import {
  *
  * @param {ShallowWrapper} wrapper
  * @param {Function} predicate
+ * @param {Function} filter
  * @returns {ShallowWrapper}
  */
-function findWhereUnwrapped(wrapper, predicate) {
-  return wrapper.flatMap(n => treeFilter(n.node, predicate));
+function findWhereUnwrapped(wrapper, predicate, filter = treeFilter) {
+  return wrapper.flatMap(n => filter(n.node, predicate));
 }
 
 /**
@@ -79,6 +81,7 @@ export default class ShallowWrapper {
       this.length = this.nodes.length;
     }
     this.options = options;
+    this.complexSelector = new ComplexSelector(buildPredicate, findWhereUnwrapped, childrenOfNode);
   }
 
   /**
@@ -236,8 +239,7 @@ export default class ShallowWrapper {
    * @returns {ShallowWrapper}
    */
   find(selector) {
-    const predicate = buildPredicate(selector);
-    return findWhereUnwrapped(this, predicate);
+    return this.complexSelector.find(selector, this);
   }
 
   /**
@@ -629,7 +631,8 @@ export default class ShallowWrapper {
     const nodes = this.nodes.map((n, i) => fn.call(this, this.wrap(n), i));
     const flattened = flatten(nodes, true);
     const uniques = unique(flattened);
-    return this.wrap(uniques);
+    const compacted = compact(uniques);
+    return this.wrap(compacted);
   }
 
   /**