Initial commit

node_modules/is-expression/index.js

@@ -0,0 +1,45 @@
+'use strict';
+
+var acorn = require('acorn');
+var objectAssign = require('object-assign');
+
+module.exports = isExpression;
+
+var DEFAULT_OPTIONS = {
+  throw: false,
+  strict: false,
+  lineComment: false
+};
+
+function isExpression(src, options) {
+  options = objectAssign({}, DEFAULT_OPTIONS, options);
+
+  try {
+    var parser = new acorn.Parser(options, src, 0);
+
+    if (options.strict) {
+      parser.strict = true;
+    }
+
+    if (!options.lineComment) {
+      parser.skipLineComment = function (startSkip) {
+        this.raise(this.pos, 'Line comments not allowed in an expression');
+      };
+    }
+
+    parser.nextToken();
+    parser.parseExpression();
+
+    if (parser.type !== acorn.tokTypes.eof) {
+      parser.unexpected();
+    }
+  } catch (ex) {
+    if (!options.throw) {
+      return false;
+    }
+
+    throw ex;
+  }
+
+  return true;
+}