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1 files changed, 65 insertions, 0 deletions

diff --git a/cordova/node_modules/pegjs/lib/compiler/asts.js b/cordova/node_modules/pegjs/lib/compiler/asts.js
new file mode 100644
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+++ b/cordova/node_modules/pegjs/lib/compiler/asts.js
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+"use strict";
+
+var arrays  = require("../utils/arrays"),
+    visitor = require("./visitor");
+
+/* AST utilities. */
+var asts = {
+  findRule: function(ast, name) {
+    return arrays.find(ast.rules, function(r) { return r.name === name; });
+  },
+
+  indexOfRule: function(ast, name) {
+    return arrays.indexOf(ast.rules, function(r) { return r.name === name; });
+  },
+
+  alwaysConsumesOnSuccess: function(ast, node) {
+    function consumesTrue()  { return true;  }
+    function consumesFalse() { return false; }
+
+    function consumesExpression(node) {
+      return consumes(node.expression);
+    }
+
+    var consumes = visitor.build({
+      rule:  consumesExpression,
+      named: consumesExpression,
+
+      choice: function(node) {
+        return arrays.every(node.alternatives, consumes);
+      },
+
+      action: consumesExpression,
+
+      sequence: function(node) {
+        return arrays.some(node.elements, consumes);
+      },
+
+      labeled:      consumesExpression,
+      text:         consumesExpression,
+      simple_and:   consumesFalse,
+      simple_not:   consumesFalse,
+      optional:     consumesFalse,
+      zero_or_more: consumesFalse,
+      one_or_more:  consumesExpression,
+      group:        consumesExpression,
+      semantic_and: consumesFalse,
+      semantic_not: consumesFalse,
+
+      rule_ref: function(node) {
+        return consumes(asts.findRule(ast, node.name));
+      },
+
+      literal: function(node) {
+        return node.value !== "";
+      },
+
+      "class": consumesTrue,
+      any:     consumesTrue
+    });
+
+    return consumes(node);
+  }
+};
+
+module.exports = asts;