Allow preserving parenthesis.

README.md

@@ -71,6 +71,7 @@ The available options are:
  appearing in parser input and raw bytes in source code, and how Lua escape
  sequences in JavaScript strings should be interpreted. See the
  [Encoding modes](#encoding-modes) section below for more information.
+- `preserveParens: false` Preserve parenthesis in the resulting tree.
 
 The default options are also exposed through `luaparse.defaultOptions` where
 they can be overriden globally.

bin/luaparse

@@ -12,6 +12,7 @@ var fs = require('fs')
  , beautify = false
  , quiet = false
  , verbose = false
+ , parens = false
  , input = ''
  , options = {}
  , snippets = [];
@@ -23,6 +24,7 @@ function usage() {
  , " -c|--code [code] parse code snippet"
  , " -f|--file [file] parse from file"
  , " -b|--beautify output an indenteted AST"
+ , " -p|--parens preserve parenthesis in the source code"
  , " --[no]-comments store comments. defaults to true"
  , " --[no]-scope store variable scope. defaults to false"
  , " --[no]-locations store location data on syntax nodes. defaults to false"
@@ -52,6 +54,9 @@ for (var i = 0, l = args.length; i < l; i++) {
  case 'b': case 'beautify':
  beautify = true;
  continue;
+ case 'p': case 'parens':
+ options.preserveParens = true;
+ continue;
  case 'q': case 'quiet':
  quiet = true;
  continue;

luaparse.js

@@ -88,6 +88,8 @@
  , luaVersion: '5.1'
  // Encoding mode: how to interpret code units higher than U+007F in input
  , encodingMode: 'none'
+ // Preserve parenthesis in the resulting tree.
+ , preserveParens: false
  };
 
  function encodeUTF8(codepoint, highMask) {
@@ -232,6 +234,13 @@
  , label: label
  };
  }
+
+ , parenthesizedExpression: function(expression) {
+ return {
+ type: 'ParenthesizedExpression'
+ , expression: expression
+ };
+ }
 
  , breakStatement: function() {
  return {
@@ -2517,8 +2526,10 @@
  // Set the parent scope.
  if (options.scope) attachScope(base, scopeHasName(name));
  } else if (consume('(')) {
+ if (options.preserveParens) pushLocation(marker);
  base = parseExpectedExpression(flowContext);
  expect(')');
+ if (options.preserveParens) base = finishNode(ast.parenthesizedExpression(base));
  } else {
  return null;
  }