add WIP build plugins

scripts/build-plugins/inline-node-builders.js

@@ -0,0 +1,52 @@
+module.exports = function (babel) {
+  var t = babel.types;
+
+  return new babel.Plugin("inline-node-builders", {
+    visitor: {
+      CallExpression: function (node, parent, scope) {
+        var callee = this.get("callee");
+        if (!callee.isMemberExpression()) return;
+
+        var obj = callee.get("object");
+        if (!obj.referencesImport("babel-types", "*")) return;
+
+        var prop = callee.get("property");
+        if (!prop.isIdentifier()) return;
+
+        var type = prop.node.name;
+        var builder = t.BUILDER_KEYS[type] || t.BUILDER_KEYS[type[0].toUpperCase() + type.slice(1)];
+        if (!builder) return;
+
+        var props = [];
+
+        var i = 0;
+
+        for (var key in builder) {
+          var def = builder[key];
+          var arg = node.arguments[i];
+
+          if (arg) {
+            if (t.isLiteral(arg)) {
+              props.push(t.property("init", t.identifier(key), arg));
+            } else {
+              var uid = scope.generateDeclaredUidIdentifier("temp");
+              props.push(t.property("init", t.identifier(key), t.sequenceExpression([
+                t.assignmentExpression("=", uid, arg),
+                t.conditionalExpression(
+                  t.logicalExpression("===", uid, t.identifier("undefined")),
+                  t.valueToNode(def),
+                  uid
+                )
+              ])));
+            }
+          } else {
+            props.push(t.property("init", t.identifier(key), t.valueToNode(def)));
+          }
+        }
+
+
+        return t.objectExpression(props);
+      }
+    }
+  });
+};

scripts/build-plugins/inline-node-type-checks.js

@@ -0,0 +1,107 @@
+module.exports = function (babel) {
+  var t = babel.types;
+
+  function buildOr(target, aliases) {
+    var conditions = [];
+
+    target = t.memberExpression(target, t.identifier("type"));
+
+    for (var i = 0; i < aliases.length; i++) {
+      var alias = aliases[i];
+      conditions.push(t.binaryExpression("===", target, t.literal(alias)));
+    }
+
+    if (conditions.length === 1) {
+      return conditions[0];
+    }
+
+    var root = t.logicalExpression("||", conditions.shift(), conditions.shift());
+
+    for (var i = 0; i < conditions.length; i++) {
+      root = t.logicalExpression("||", root, conditions[i]);
+    }
+
+    return root;
+  }
+
+  function maybeBuildArgsComparison(or, target, obj) {
+    if (!obj) return or;
+
+    var conditions = [];
+
+    for (var i = 0; i < obj.properties.length; i++) {
+      var prop = obj.properties[i];
+      conditions.push(t.binaryExpression("===",
+        t.memberExpression(target, prop.key, t.isLiteral(prop.key)),
+        prop.value
+      ));
+    }
+
+    var root;
+
+    if (!conditions.length) {
+      return or;
+    } else if (conditions.length === 1) {
+      root = conditions[0];
+    } else {
+      root = t.logicalExpression("&&", conditions.shift(), conditions.shift());
+      for (var i = 0; i < conditions.length; i++) {
+        root = t.logicalExpression("&&", root, conditions[i]);
+      }
+    }
+
+    return t.logicalExpression("&&", or, root);
+  }
+
+  function shouldDeopt(args) {
+    if (args.length > 1) {
+      return true;
+    }
+
+    if (args.length) {
+      var obj = args[0];
+      if (!t.isObjectExpression(obj)) return true;
+
+      for (var i = 0; i < obj.properties.length; i++) {
+        var prop = obj.properties[i];
+        if (prop.computed) return true;
+      }
+    }
+
+    return false;
+  }
+
+  function buildCheck(target, args, aliases) {
+    if (shouldDeopt(args)) return;
+
+    return t.logicalExpression(
+      "&&",
+      target,
+      maybeBuildArgsComparison(buildOr(target, aliases), target, args[0])
+    );
+  }
+
+  return new babel.Plugin("inline-node-type-checks", {
+    visitor: {
+      CallExpression: function (node) {
+        var callee = this.get("callee");
+        if (!callee.isMemberExpression()) return;
+
+        var prop = callee.get("property");
+        if (!prop.isIdentifier() || callee.is("computed")) return;
+        if (prop.node.name.indexOf("is") !== 0) return;
+
+        var type = prop.node.name.slice(2);
+        var aliases = t.FLIPPED_ALIAS_KEYS[type] || [type];
+
+        var obj = callee.get("object");
+
+        if (obj.referencesImport("babel-types", "*")) {
+          return buildCheck(node.arguments.shift(), node.arguments, aliases, this.scope);
+        } else {
+          return buildCheck(t.memberExpression(obj.node, t.identifier("node")), node.arguments, aliases, this.scope);
+        }
+      }
+    }
+  });
+};