Class: MilkTea::Steamworks::Generator

Inherits:
Object
  • Object
show all
Defined in:
lib/milk_tea/bindings/steamworks.rb

Constant Summary collapse

HEADER_GUARD = 
"MT_LANG_STEAMWORKS_H"
MANUAL_OPAQUE_TYPES = 
%w[
  CCallbackBase
  CallbackMsg_t
  ISteamNetworkingConnectionSignaling
  ISteamNetworkingSignalingRecvContext
  ScePadTriggerEffectParam
  SteamDatagramRelayAuthTicket
].freeze
SPECIAL_TYPE_REWRITES = 
{
  "CGameID" => "uint64_gameid",
  "CSteamID" => "uint64_steamid",
  "SteamInputActionEvent_t::AnalogAction_t" => "SteamInputActionEvent_t_AnalogAction_t",
  "SteamInputActionEvent_t::DigitalAction_t" => "SteamInputActionEvent_t_DigitalAction_t",
}.freeze
MANUAL_FUNCTION_POINTER_TYPEDEFS = 
{
  "SteamAPIWarningMessageHook_t" => ["void", ["int", "const char *"]],
}.freeze
MANUAL_SUPPORT_STRUCT_DEFINITIONS = 
[
  "typedef struct SteamInputActionEvent_t_AnalogAction_t {",
  "    InputAnalogActionHandle_t actionHandle;",
  "    InputAnalogActionData_t analogActionData;",
  "} SteamInputActionEvent_t_AnalogAction_t;",
  "",
  "typedef struct SteamInputActionEvent_t_DigitalAction_t {",
  "    InputDigitalActionHandle_t actionHandle;",
  "    InputDigitalActionData_t digitalActionData;",
  "} SteamInputActionEvent_t_DigitalAction_t;",
].freeze
MANUAL_FUNCTIONS = 
[
  { return_type: "ESteamAPIInitResult", name: "SteamAPI_InitFlat", params: [{ name: "pOutErrMsg", type: "SteamErrMsg *" }] },
  { return_type: "void", name: "SteamAPI_Shutdown", params: [] },
  { return_type: "bool", name: "SteamAPI_RestartAppIfNecessary", params: [{ name: "unOwnAppID", type: "uint32" }] },
  { return_type: "void", name: "SteamAPI_ReleaseCurrentThreadMemory", params: [] },
  { return_type: "void", name: "SteamAPI_WriteMiniDump", params: [{ name: "uStructuredExceptionCode", type: "uint32" }, { name: "pvExceptionInfo", type: "void *" }, { name: "uBuildID", type: "uint32" }] },
  { return_type: "void", name: "SteamAPI_SetMiniDumpComment", params: [{ name: "pchMsg", type: "const char *" }] },
  { return_type: "bool", name: "SteamAPI_IsSteamRunning", params: [] },
  { return_type: "const char *", name: "SteamAPI_GetSteamInstallPath", params: [] },
  { return_type: "void", name: "SteamAPI_SetTryCatchCallbacks", params: [{ name: "bTryCatchCallbacks", type: "bool" }] },
  { return_type: "bool", name: "SteamAPI_InitSafe", params: [] },
  { return_type: "void", name: "SteamAPI_UseBreakpadCrashHandler", params: [{ name: "pchVersion", type: "const char *" }, { name: "pchDate", type: "const char *" }, { name: "pchTime", type: "const char *" }, { name: "bFullMemoryDumps", type: "bool" }, { name: "pvContext", type: "void *" }, { name: "pfnPreMinidumpCallback", type: "PFNPreMinidumpCallback" }] },
  { return_type: "void", name: "SteamAPI_SetBreakpadAppID", params: [{ name: "unAppID", type: "uint32" }] },
  { return_type: "void", name: "SteamAPI_ManualDispatch_Init", params: [] },
  { return_type: "void", name: "SteamAPI_ManualDispatch_RunFrame", params: [{ name: "hSteamPipe", type: "HSteamPipe" }] },
  { return_type: "bool", name: "SteamAPI_ManualDispatch_GetNextCallback", params: [{ name: "hSteamPipe", type: "HSteamPipe" }, { name: "pCallbackMsg", type: "CallbackMsg_t *" }] },
  { return_type: "void", name: "SteamAPI_ManualDispatch_FreeLastCallback", params: [{ name: "hSteamPipe", type: "HSteamPipe" }] },
  { return_type: "bool", name: "SteamAPI_ManualDispatch_GetAPICallResult", params: [{ name: "hSteamPipe", type: "HSteamPipe" }, { name: "hSteamAPICall", type: "SteamAPICall_t" }, { name: "pCallback", type: "void *" }, { name: "cubCallback", type: "int" }, { name: "iCallbackExpected", type: "int" }, { name: "pbFailed", type: "bool *" }] },
  { return_type: "ESteamAPIInitResult", name: "SteamInternal_SteamAPI_Init", params: [{ name: "pszInternalCheckInterfaceVersions", type: "const char *" }, { name: "pOutErrMsg", type: "SteamErrMsg *" }] },
  { return_type: "void", name: "SteamAPI_RunCallbacks", params: [] },
  { return_type: "void", name: "SteamGameServer_RunCallbacks", params: [] },
  { return_type: "HSteamPipe", name: "SteamAPI_GetHSteamPipe", params: [] },
  { return_type: "HSteamUser", name: "SteamAPI_GetHSteamUser", params: [] },
  { return_type: "HSteamPipe", name: "SteamGameServer_GetHSteamPipe", params: [] },
  { return_type: "HSteamUser", name: "SteamGameServer_GetHSteamUser", params: [] },
  { return_type: "void *", name: "SteamInternal_ContextInit", params: [{ name: "pContextInitData", type: "void *" }] },
  { return_type: "void *", name: "SteamInternal_CreateInterface", params: [{ name: "ver", type: "const char *" }] },
  { return_type: "void *", name: "SteamInternal_FindOrCreateUserInterface", params: [{ name: "hSteamUser", type: "HSteamUser" }, { name: "pszVersion", type: "const char *" }] },
  { return_type: "void *", name: "SteamInternal_FindOrCreateGameServerInterface", params: [{ name: "hSteamUser", type: "HSteamUser" }, { name: "pszVersion", type: "const char *" }] },
  { return_type: "void", name: "SteamAPI_RegisterCallback", params: [{ name: "pCallback", type: "CCallbackBase *" }, { name: "iCallback", type: "int" }] },
  { return_type: "void", name: "SteamAPI_UnregisterCallback", params: [{ name: "pCallback", type: "CCallbackBase *" }] },
  { return_type: "void", name: "SteamAPI_RegisterCallResult", params: [{ name: "pCallback", type: "CCallbackBase *" }, { name: "hAPICall", type: "SteamAPICall_t" }] },
  { return_type: "void", name: "SteamAPI_UnregisterCallResult", params: [{ name: "pCallback", type: "CCallbackBase *" }, { name: "hAPICall", type: "SteamAPICall_t" }] },
  { return_type: "void", name: "SteamGameServer_Shutdown", params: [] },
  { return_type: "bool", name: "SteamGameServer_BSecure", params: [] },
  { return_type: "uint64", name: "SteamGameServer_GetSteamID", params: [] },
  { return_type: "ESteamAPIInitResult", name: "SteamInternal_GameServer_Init_V2", params: [{ name: "unIP", type: "uint32" }, { name: "usGamePort", type: "uint16" }, { name: "usQueryPort", type: "uint16" }, { name: "eServerMode", type: "EServerMode" }, { name: "pchVersionString", type: "const char *" }, { name: "pszInternalCheckInterfaceVersions", type: "const char *" }, { name: "pOutErrMsg", type: "SteamErrMsg *" }] },
].freeze

Instance Method Summary collapse

Constructor Details

#initialize(json_path: nil, json_source: nil, source_label: nil) ⇒ Generator

Returns a new instance of Generator.

Raises:

  • (ArgumentError) 


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# File 'lib/milk_tea/bindings/steamworks.rb', line 228

def initialize(json_path: nil, json_source: nil, source_label: nil)
  raise ArgumentError, "json_path or json_source is required" if json_path.nil? && json_source.nil?

  @json_source = json_source || File.read(json_path)
  @source_label = source_label || File.expand_path(json_path.to_s)
end

Instance Method Details

#all_enums ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 303

def all_enums
  @all_enums ||= begin
    enums = {}
    metadata.fetch("enums", []).each { |entry| enums[entry.fetch("enumname")] ||= entry }
    [interfaces, structs, callback_structs].each do |group|
      group.each do |entry|
        Array(entry["enums"]).each do |enum_entry|
          enums[enum_entry.fetch("enumname")] ||= enum_entry
        end
      end
    end
    enums.values
  end
end

#callback_structs ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 299

def callback_structs
  metadata.fetch("callback_structs", [])
end

#emit_accessors ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 506

def emit_accessors
  interfaces.flat_map do |entry|
    interface_name = entry.fetch("classname")
    Array(entry["accessors"]).map do |accessor|
      emit_function("#{interface_name} *", accessor.fetch("name_flat"), [])
    end
  end
end

#emit_constant(name:, type:, value:) ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 493

def emit_constant(name:, type:, value:)
  normalized_type = normalize_type(type)
  return "static const #{normalized_type} #{name} = #{value};" if normalized_type == "float"

  "enum { #{name} = #{value} };"
end

#emit_constants ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 466

def emit_constants
  lines = []
  metadata.fetch("consts", []).each do |entry|
    lines << emit_constant(name: entry.fetch("constname"), type: entry.fetch("consttype"), value: entry.fetch("constval"))
  end

  structs.each do |entry|
    Array(entry["consts"]).each do |const_entry|
      scoped_name = "#{entry.fetch('struct')}_#{const_entry.fetch('constname')}"
      lines << emit_constant(name: scoped_name, type: const_entry.fetch("consttype"), value: const_entry.fetch("constval"))
    end
  end

  callback_structs.each do |entry|
    callback_name = entry.fetch("struct")
    if entry["callback_id"]
      lines << emit_constant(name: "#{callback_name}_k_iCallback", type: "int", value: entry.fetch("callback_id").to_s)
    end
    Array(entry["consts"]).each do |const_entry|
      scoped_name = "#{callback_name}_#{const_entry.fetch('constname')}"
      lines << emit_constant(name: scoped_name, type: const_entry.fetch("consttype"), value: const_entry.fetch("constval"))
    end
  end

  lines
end

#emit_enums ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 393

def emit_enums
  all_enums.flat_map do |entry|
    lines = []
    name = entry.fetch("enumname")
    lines << "typedef enum #{name} {"
    Array(entry.fetch("values", [])).each do |value|
      lines << "    #{value.fetch('name')} = #{value.fetch('value')},"
    end
    lines << "} #{name};"
    lines << ""
    lines
  end[0..-2] || []
end

#emit_flat_aliases ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 386

def emit_flat_aliases
  [
    "typedef uint64 uint64_steamid;",
    "typedef uint64 uint64_gameid;",
  ]
end

#emit_forward_declarations ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 333

def emit_forward_declarations
  lines = []
  opaque_types = []
  opaque_types.concat(interfaces.map { |entry| entry.fetch("classname") })
  opaque_types.concat(MANUAL_OPAQUE_TYPES)
  opaque_types.uniq.sort.each do |name|
    lines << "typedef struct #{name} #{name};"
  end

  record_names = structs.map { |entry| entry.fetch("struct") } + callback_structs.map { |entry| entry.fetch("struct") }
  record_names.uniq.sort.each do |name|
    lines << "typedef struct #{name} #{name};"
  end

  lines
end

#emit_function(return_type, name, params) ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 564

def emit_function(return_type, name, params)
  signature = params.map { |param| format_declarator(normalize_type(param.fetch(:type)), param.fetch(:name)) }
  signature = ["void"] if signature.empty?
  "#{normalize_type(return_type)} #{name}(#{signature.join(', ')});"
end

#emit_generic_struct(entry) ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 432

def emit_generic_struct(entry)
  name = entry.fetch("struct")
  return emit_steam_input_action_event_struct(entry) if name == "SteamInputActionEvent_t"

  fields = Array(entry.fetch("fields", []))
  lines = []
  lines << "struct #{name} {"
  if fields.empty?
    lines << "    char _mt_dummy;"
  end
  fields.each do |field|
    lines << "    #{format_declarator(normalize_type(field.fetch('fieldtype')), field.fetch('fieldname'))};"
  end
  lines << "};"
  lines
end

#emit_inline_wrappers ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 537

def emit_inline_wrappers
  lines = []
  lines << "static inline bool SteamAPI_Init(void) {"
  lines << "    return SteamAPI_InitFlat(NULL) == k_ESteamAPIInitResult_OK;"
  lines << "}"
  lines << ""
  lines << "static inline void SteamGameServer_ReleaseCurrentThreadMemory(void) {"
  lines << "    SteamAPI_ReleaseCurrentThreadMemory();"
  lines << "}"

  accessor_wrappers = interfaces.flat_map do |entry|
    interface_name = entry.fetch("classname")
    Array(entry["accessors"]).flat_map do |accessor|
      wrapper_name = accessor.fetch("name_flat").sub(/_v[0-9A-Za-z]+\z/, "")
      [
        "",
        "static inline #{interface_name} * #{wrapper_name}(void) {",
        "    return #{accessor.fetch('name_flat')}();",
        "}",
      ]
    end
  end

  lines.concat(accessor_wrappers)
  lines
end

#emit_interface_methods ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 515

def emit_interface_methods
  interfaces.flat_map do |entry|
    interface_name = entry.fetch("classname")
    Array(entry.fetch("methods", [])).map do |method|
      params = [{ name: "self", type: "#{interface_name} *" }]
      params.concat(Array(method["params"]).map { |param| { name: param.fetch("paramname"), type: param["paramtype_flat"] || param.fetch("paramtype") } })
      emit_function(method["returntype_flat"] || method.fetch("returntype"), method.fetch("methodname_flat"), params)
    end
  end
end

#emit_manual_function_pointer_typedefs ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 367

def emit_manual_function_pointer_typedefs
  lines = []

  typedefs.each do |entry|
    next unless function_pointer_type?(entry.fetch("type"))

    match = entry.fetch("type").strip.match(/\A(.+?)\(\s*\*\s*\)\s*\((.*)\)\z/)
    return_type = normalize_type(match[1])
    params = normalize_function_pointer_params(match[2])
    lines << "typedef #{return_type} (*#{entry.fetch('typedef')})(#{params.join(', ')});"
  end

  MANUAL_FUNCTION_POINTER_TYPEDEFS.each do |name, (return_type, params)|
    lines << "typedef #{normalize_type(return_type)} (*#{name})(#{params.map { |param| normalize_type(param) }.join(', ')});"
  end

  lines
end

#emit_manual_functions ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 500

def emit_manual_functions
  MANUAL_FUNCTIONS.map do |entry|
    emit_function(entry.fetch(:return_type), entry.fetch(:name), entry.fetch(:params))
  end
end

#emit_steam_input_action_event_struct(entry) ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 449

def emit_steam_input_action_event_struct(entry)
  fields = Array(entry.fetch("fields", []))
  lines = []
  lines << "struct SteamInputActionEvent_t {"
  fields.each do |field|
    next if field.fetch("fieldname") == "analogAction"

    lines << "    #{format_declarator(normalize_type(field.fetch('fieldtype')), field.fetch('fieldname'))};"
  end
  lines << "    union {"
  lines << "        SteamInputActionEvent_t_AnalogAction_t analogAction;"
  lines << "        SteamInputActionEvent_t_DigitalAction_t digitalAction;"
  lines << "    };"
  lines << "};"
  lines
end

#emit_struct_methods ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 526

def emit_struct_methods
  structs.flat_map do |entry|
    struct_name = entry.fetch("struct")
    Array(entry["methods"]).map do |method|
      params = [{ name: "self", type: "#{struct_name} *" }]
      params.concat(Array(method["params"]).map { |param| { name: param.fetch("paramname"), type: param["paramtype_flat"] || param.fetch("paramtype") } })
      emit_function(method["returntype_flat"] || method.fetch("returntype"), method.fetch("methodname_flat"), params)
    end
  end
end

#emit_structs ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 407

def emit_structs
  regular_entries = []
  delayed_entries = []

  (structs + callback_structs).each do |entry|
    if entry.fetch("struct") == "SteamInputActionEvent_t"
      delayed_entries << entry
    else
      regular_entries << entry
    end
  end

  lines = regular_entries.flat_map { |entry| emit_generic_struct(entry) + [""] }
  unless delayed_entries.empty?
    lines.concat(MANUAL_SUPPORT_STRUCT_DEFINITIONS)
    lines << ""
    delayed_entries.each do |entry|
      lines.concat(emit_generic_struct(entry))
      lines << ""
    end
  end

  lines[0..-2] || []
end

#emit_typedef(entry) ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 354

def emit_typedef(entry)
  name = entry.fetch("typedef")
  source = entry.fetch("type")

  return if function_pointer_type?(source)

  if (match = split_array_type(source))
    return "typedef #{normalize_type(match[0])} #{name}[#{match[1]}];"
  end

  "typedef #{normalize_type(source)} #{name};"
end

#emit_typedefs ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 350

def emit_typedefs
  typedefs.filter_map { |entry| emit_typedef(entry) }
end

#format_declarator(type, name) ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 593

def format_declarator(type, name)
  if (match = type.match(/\A(.+?)\(\s*\*\s*\)\s*\((.*)\)\z/))
    params = normalize_function_pointer_params(match[2]).join(', ')
    return "#{normalize_type(match[1])} (*#{name})(#{params})"
  end

  if (match = split_array_type(type))
    return "#{match[0]} #{name}[#{match[1]}]"
  end

  "#{type} #{name}"
end

#function_pointer_type?(source) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/bindings/steamworks.rb', line 613

def function_pointer_type?(source)
  source.to_s.strip.match?(/\A.+?\(\s*\*\s*\)\s*\(.*\)\z/)
end

#generate ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 235

def generate
  lines = []
  lines << "/* generated by mtc steamworks from #{@source_label} */"
  lines << "#ifndef #{HEADER_GUARD}"
  lines << "#define #{HEADER_GUARD}"
  lines << ""
  lines << "#include <stdbool.h>"
  lines << "#include <stddef.h>"
  lines << "#include <stdint.h>"
  lines << ""
  lines << "#ifdef __cplusplus"
  lines << 'extern "C" {'
  lines << "#endif"
  lines << ""
  lines.concat(emit_forward_declarations)
  lines << "" unless lines.last.empty?
  lines.concat(emit_typedefs)
  lines << "" unless lines.last.empty?
  lines.concat(emit_flat_aliases)
  lines << "" unless lines.last.empty?
  lines.concat(emit_enums)
  lines << "" unless lines.last.empty?
  lines.concat(emit_structs)
  lines << "" unless lines.last.empty?
  lines.concat(emit_manual_function_pointer_typedefs)
  lines << "" unless lines.last.empty?
  lines.concat(emit_constants)
  lines << "" unless lines.last.empty?
  lines.concat(emit_manual_functions)
  lines << "" unless lines.last.empty?
  lines.concat(emit_accessors)
  lines << "" unless lines.last.empty?
  lines.concat(emit_interface_methods)
  lines << "" unless lines.last.empty?
  lines.concat(emit_struct_methods)
  lines << "" unless lines.last.empty?
  lines.concat(emit_inline_wrappers)
  lines << ""
  lines << "#ifdef __cplusplus"
  lines << "}"
  lines << "#endif"
  lines << ""
  lines << "#endif"
  lines.join("\n") + "\n"
end

#interfaces ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 291

def interfaces
  metadata.fetch("interfaces", [])
end

#metadata ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 281

def metadata
  @metadata ||= JSON.parse(@json_source)
rescue JSON::ParserError => e
  raise Error, "failed to parse Steamworks metadata #{@source_label}: #{e.message}"
end

#normalize_function_pointer_params(source) ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 606

def normalize_function_pointer_params(source)
  params = source.strip
  return ["void"] if params.empty? || params == "void"

  params.split(/\s*,\s*/).map { |param| normalize_type(param) }
end

#normalize_type(type) ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 570

def normalize_type(type)
  value = type.to_s.strip
  return value if value.empty?

  if (match = split_array_type(value))
    return "#{normalize_type(match[0])}[#{match[1]}]"
  end

  scoped_type_rewrites.each do |source, target|
    value = value.gsub(source, target)
  end

  SPECIAL_TYPE_REWRITES.each do |source, target|
    value = value.gsub(source, target)
  end

  value = value.gsub(/\b(?:class|struct|enum)\s+/, "")
  value = value.gsub(/\s*&/, " *")
  value = value.gsub(/\s*\*\s*/, " *")
  value = value.gsub(/\s+/, " ").strip
  value
end

#scoped_type_rewrites ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 318

def scoped_type_rewrites
  @scoped_type_rewrites ||= begin
    rewrites = {}
    [interfaces, structs, callback_structs].each do |group|
      group.each do |entry|
        Array(entry["enums"]).each do |enum_entry|
          fqname = enum_entry["fqname"]
          rewrites[fqname] = enum_entry.fetch("enumname") if fqname
        end
      end
    end
    rewrites
  end
end

#split_array_type(source) ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 617

def split_array_type(source)
  match = source.strip.match(/\A(.+?)\s*\[(.+)\]\z/)
  return unless match

  [match[1].strip, match[2].strip]
end

#structs ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 295

def structs
  metadata.fetch("structs", [])
end

#typedefs ⇒ Object 



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# File 'lib/milk_tea/bindings/steamworks.rb', line 287

def typedefs
  metadata.fetch("typedefs", [])
end