chore: rename isgenerator for is_generator

lib/ast.js

@@ -437,10 +437,10 @@ var AST_ArrowParametersOrSeq = DEFNODE("ArrowParametersOrSeq", "expressions", {
     }
 });
 
-var AST_Lambda = DEFNODE("Lambda", "name argnames uses_arguments isgenerator", {
+var AST_Lambda = DEFNODE("Lambda", "name argnames uses_arguments is_generator", {
     $documentation: "Base class for functions",
     $propdoc: {
-        isgenerator: "is generatorFn or not",
+        is_generator: "is generatorFn or not",
         name: "[AST_SymbolDeclaration?] the name of this function",
         argnames: "[AST_SymbolFunarg|AST_Destructuring|AST_Expansion*] array of function arguments, destructurings, or expanding arguments",
         uses_arguments: "[boolean/S] tells whether this function accesses the arguments array"

lib/output.js

@@ -788,7 +788,7 @@ function OutputStream(options) {
         var self = this;
         if (!nokeyword) {
             output.print("function");
-            if (this.isgenerator) {
+            if (this.is_generator) {
                 output.star();
             }
             if (self.name) {

lib/parse.js

@@ -1052,8 +1052,8 @@ function parse($TEXT, options) {
         var start = S.token
 
         var in_statement = ctor === AST_Defun;
-        var isgenerator = is("operator", "*");
-        if (isgenerator) {
+        var is_generator = is("operator", "*");
+        if (is_generator) {
           next();
         }
 
@@ -1066,7 +1066,7 @@ function parse($TEXT, options) {
         return new ctor({
             start : args.start,
             end   : body.end,
-            isgenerator: isgenerator,
+            is_generator: is_generator,
             name  : name,
             argnames: args,
             body  : body

test/parser.js

@@ -121,7 +121,7 @@ module.exports = function () {
 
     // generators
     var generators_def = UglifyJS.parse('function* fn() {}').body[0];
-    ok.equal(generators_def.isgenerator, true);
+    ok.equal(generators_def.is_generator, true);
 
     ok.throws(function () {
         UglifyJS.parse('function* (){ }');