Add support for JavaScript code generation

This adds a JavaScript language target. The generated JavaScript uses Google
Closure Compiler type annotations and can be compiled using the advanced
compilation mode, which performs type checking and optimizations such as
inlining and dead code elimination. The generated JavaScript also exports all
generated symbols for use with Node.js and RequireJS. This export behavior
can be turned off with the --no-js-exports flag for use with Google Closure
Compiler.

Author: evanw

.gitignore

@@ -44,6 +44,7 @@ snapshot.sh
 tests/go_gen
 tests/monsterdata_java_wire.mon
 tests/monsterdata_go_wire.mon
+tests/monsterdata_javascript_wire.mon
 CMakeLists.txt.user
 CMakeScripts/**
 CTestTestfile.cmake
@@ -55,4 +56,4 @@ java/.idea
 java/*.iml
 java/target
 **/*.pyc
-.idea
+.idea

CMakeLists.txt

@@ -33,6 +33,7 @@ set(FlatBuffers_Compiler_SRCS
   src/idl_gen_cpp.cpp
   src/idl_gen_general.cpp
   src/idl_gen_go.cpp
+  src/idl_gen_js.cpp
   src/idl_gen_python.cpp
   src/idl_gen_fbs.cpp
   src/flatc.cpp

include/flatbuffers/idl.h

@@ -449,6 +449,7 @@ extern void GenComment(const std::vector<std::string> &dc,
 // Container of options that may apply to any of the source/text generators.
 struct GeneratorOptions {
   bool strict_json;
+  bool skip_js_exports;
   bool output_default_scalars_in_json;
   int indent_step;
   bool output_enum_identifiers;
@@ -464,6 +465,7 @@ struct GeneratorOptions {
   Language lang;
 
   GeneratorOptions() : strict_json(false),
+                       skip_js_exports(false),
                        output_default_scalars_in_json(false),
                        indent_step(2),
                        output_enum_identifiers(true), prefixed_enums(true), scoped_enums(false),
@@ -506,6 +508,15 @@ extern bool GenerateCPP(const Parser &parser,
                         const std::string &file_name,
                         const GeneratorOptions &opts);
 
+// Generate JavaScript code from the definitions in the Parser object.
+// See idl_gen_js.
+extern std::string GenerateJS(const Parser &parser,
+                              const GeneratorOptions &opts);
+extern bool GenerateJS(const Parser &parser,
+                       const std::string &path,
+                       const std::string &file_name,
+                       const GeneratorOptions &opts);
+
 // Generate Go files from the definitions in the Parser object.
 // See idl_gen_go.cpp.
 extern bool GenerateGo(const Parser &parser,
@@ -551,6 +562,13 @@ extern bool GenerateFBS(const Parser &parser,
                         const std::string &file_name,
                         const GeneratorOptions &opts);
 
+// Generate a make rule for the generated JavaScript code.
+// See idl_gen_js.cpp.
+extern std::string JSMakeRule(const Parser &parser,
+                              const std::string &path,
+                              const std::string &file_name,
+                              const GeneratorOptions &opts);
+
 // Generate a make rule for the generated C++ header.
 // See idl_gen_cpp.cpp.
 extern std::string CPPMakeRule(const Parser &parser,