/*

* Copyright 2014 Google Inc. All rights reserved.

*

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*/

// independent from idl_parser, since this code is not needed for most clients

#include "flatbuffers/flatbuffers.h"

#include "flatbuffers/idl.h"

#include "flatbuffers/util.h"

#include "flatbuffers/code_generators.h"

#include <algorithm>

namespace flatbuffers {

// Convert an underscore_based_indentifier in to camelCase.

// Also uppercases the first character if first is true.

std::string MakeCamel(const std::string &in, bool first) {

std::string s;

for (size_t i = 0; i < in.length(); i++) {

if (!i && first)

s += static_cast<char>(toupper(in[0]));

else if (in[i] == '_' && i + 1 < in.length())

s += static_cast<char>(toupper(in[++i]));

else

s += in[i];

}

return s;

}

struct CommentConfig {

const char *first_line;

const char *content_line_prefix;

const char *last_line;

};

// Generate a documentation comment, if available.

void GenComment(const std::vector<std::string> &dc, std::string *code_ptr,

const CommentConfig *config, const char *prefix) {

if (dc.begin() == dc.end()) {

// Don't output empty comment blocks with 0 lines of comment content.

return;

}

std::string &code = *code_ptr;

if (config != nullptr && config->first_line != nullptr) {

code += std::string(prefix) + std::string(config->first_line) + "\n";

}

std::string line_prefix = std::string(prefix) +

((config != nullptr && config->content_line_prefix != nullptr) ?

config->content_line_prefix : "///");

for (auto it = dc.begin();

it != dc.end();

++it) {

code += line_prefix + *it + "\n";

}

if (config != nullptr && config->last_line != nullptr) {

code += std::string(prefix) + std::string(config->last_line) + "\n";

}

}

// These arrays need to correspond to the IDLOptions::k enum.

struct LanguageParameters {

IDLOptions::Language language;

// Whether function names in the language typically start with uppercase.

bool first_camel_upper;

std::string file_extension;

std::string string_type;

std::string bool_type;

std::string open_curly;

std::string accessor_type;

std::string const_decl;

std::string unsubclassable_decl;

std::string enum_decl;

std::string enum_separator;

std::string getter_prefix;

std::string getter_suffix;

std::string inheritance_marker;

std::string namespace_ident;

std::string namespace_begin;

std::string namespace_end;

std::string set_bb_byteorder;

std::string get_bb_position;

std::string get_fbb_offset;

std::string accessor_prefix;

std::string accessor_prefix_static;

std::string optional_suffix;

std::string includes;

CommentConfig comment_config;

};

LanguageParameters language_parameters[] = {

{

IDLOptions::kJava,

false,

".java",

"String",

"boolean ",

" {\n",

"class ",

" final ",

"final ",

"final class ",

";\n",

"()",

"",

" extends ",

"package ",

";",

"",

"_bb.order(ByteOrder.LITTLE_ENDIAN); ",

"position()",

"offset()",

"",

"",

"",

"import java.nio.*;\nimport java.lang.*;\nimport java.util.*;\n"

"import com.google.flatbuffers.*;\n\n@SuppressWarnings(\"unused\")\n",

{

"/**",

" *",

" */",

},

},

{

IDLOptions::kCSharp,

true,

".cs",

"string",

"bool ",

"\n{\n",

"struct ",

" readonly ",

"",

"enum ",

",\n",

" { get",

"} ",

" : ",

"namespace ",

"\n{",

"\n}\n",

"",

"Position",

"Offset",

"__p.",

"Table.",

"?",

"using System;\nusing FlatBuffers;\n\n",

{

nullptr,

"///",

nullptr,

},

},

// TODO: add Go support to the general generator.

// WARNING: this is currently only used for generating make rules for Go.

{

IDLOptions::kGo,

true,

".go",

"string",

"bool ",

"\n{\n",

"class ",

"const ",

" ",

"class ",

";\n",

"()",

"",

"",

"package ",

"",

"",

"",

"position()",

"offset()",

"",

"",

"",

"import (\n\tflatbuffers \"github.com/google/flatbuffers/go\"\n)",

{

nullptr,

"///",

nullptr,

},

}

};

static_assert(sizeof(language_parameters) / sizeof(LanguageParameters) ==

IDLOptions::kMAX,

"Please add extra elements to the arrays above.");

namespace general {

class GeneralGenerator : public BaseGenerator {

public:

GeneralGenerator(const Parser &parser, const std::string &path,

const std::string &file_name)

: BaseGenerator(parser, path, file_name, "", "."),

lang_(language_parameters[parser_.opts.lang]),

cur_name_space_( nullptr ) {

assert(parser_.opts.lang <= IDLOptions::kMAX);

};

GeneralGenerator &operator=(const GeneralGenerator &);

bool generate() {

std::string one_file_code;

cur_name_space_ = parser_.namespaces_.back();

for (auto it = parser_.enums_.vec.begin(); it != parser_.enums_.vec.end();

++it) {

std::string enumcode;

auto &enum_def = **it;

if (!parser_.opts.one_file)

cur_name_space_ = enum_def.defined_namespace;

GenEnum(enum_def, &enumcode);

if (parser_.opts.one_file) {

one_file_code += enumcode;

} else {

if (!SaveType(enum_def.name, *enum_def.defined_namespace,

enumcode, false)) return false;

}

}

for (auto it = parser_.structs_.vec.begin();

it != parser_.structs_.vec.end(); ++it) {

std::string declcode;

auto &struct_def = **it;

if (!parser_.opts.one_file)

cur_name_space_ = struct_def.defined_namespace;

GenStruct(struct_def, &declcode);

if (parser_.opts.one_file) {

one_file_code += declcode;

} else {

if (!SaveType(struct_def.name, *struct_def.defined_namespace,

declcode, true)) return false;

}

}

if (parser_.opts.one_file) {

return SaveType(file_name_, *parser_.namespaces_.back(),

one_file_code, true);

}

return true;

}

// Save out the generated code for a single class while adding

// declaration boilerplate.

bool SaveType(const std::string &defname, const Namespace &ns,

const std::string &classcode, bool needs_includes) {

if (!classcode.length()) return true;

std::string code;

code = code + "// " + FlatBuffersGeneratedWarning();

std::string namespace_name = FullNamespace(".", ns);

if (!namespace_name.empty()) {

code += lang_.namespace_ident + namespace_name + lang_.namespace_begin;

code += "\n\n";

}

if (needs_includes) code += lang_.includes;

code += classcode;

if (!namespace_name.empty()) code += lang_.namespace_end;

auto filename = NamespaceDir(ns) + defname + lang_.file_extension;

return SaveFile(filename.c_str(), code, false);

}

const Namespace *CurrentNameSpace() { return cur_name_space_; }

std::string FunctionStart(char upper) {

return std::string() + (lang_.language == IDLOptions::kJava

? static_cast<char>(tolower(upper))

: upper);

}

static bool IsEnum(const Type& type) {

return type.enum_def != nullptr && IsInteger(type.base_type);

}

std::string GenTypeBasic(const Type &type, bool enableLangOverrides) {

static const char *gtypename[] = {

#define FLATBUFFERS_TD(ENUM, IDLTYPE, CTYPE, JTYPE, GTYPE, NTYPE, PTYPE) \

#JTYPE, #NTYPE, #GTYPE,

FLATBUFFERS_GEN_TYPES(FLATBUFFERS_TD)

#undef FLATBUFFERS_TD

};

if (enableLangOverrides) {

if (lang_.language == IDLOptions::kCSharp) {

if (IsEnum(type)) return WrapInNameSpace(*type.enum_def);

if (type.base_type == BASE_TYPE_STRUCT) {

return "Offset<" + WrapInNameSpace(*type.struct_def) + ">";

}

}

}

return gtypename[type.base_type * IDLOptions::kMAX + lang_.language];

}

std::string GenTypeBasic(const Type &type) {

return GenTypeBasic(type, true);

}

std::string GenTypePointer(const Type &type) {

switch (type.base_type) {

case BASE_TYPE_STRING:

return lang_.string_type;

case BASE_TYPE_VECTOR:

return GenTypeGet(type.VectorType());

case BASE_TYPE_STRUCT:

return WrapInNameSpace(*type.struct_def);

case BASE_TYPE_UNION:

// Unions in C# use a generic Table-derived type for better type safety

if (lang_.language == IDLOptions::kCSharp) return "TTable";

// fall through

default:

return "Table";

}

}

std::string GenTypeGet(const Type &type) {

return IsScalar(type.base_type)

? GenTypeBasic(type)

: GenTypePointer(type);

}

// Find the destination type the user wants to receive the value in (e.g.

// one size higher signed types for unsigned serialized values in Java).

Type DestinationType(const Type &type, bool vectorelem) {

if (lang_.language != IDLOptions::kJava) return type;

switch (type.base_type) {

// We use int for both uchar/ushort, since that generally means less casting

// than using short for uchar.

case BASE_TYPE_UCHAR: return Type(BASE_TYPE_INT);

case BASE_TYPE_USHORT: return Type(BASE_TYPE_INT);

case BASE_TYPE_UINT: return Type(BASE_TYPE_LONG);

case BASE_TYPE_VECTOR:

if (vectorelem)

return DestinationType(type.VectorType(), vectorelem);

// else fall thru:

default: return type;

}

}

std::string GenOffsetType(const StructDef &struct_def) {

if(lang_.language == IDLOptions::kCSharp) {

return "Offset<" + WrapInNameSpace(struct_def) + ">";

} else {

return "int";

}

}

std::string GenOffsetConstruct(const StructDef &struct_def,

const std::string &variable_name)

{

if(lang_.language == IDLOptions::kCSharp) {

return "new Offset<" + WrapInNameSpace(struct_def) + ">(" + variable_name +

")";

}

return variable_name;

}

std::string GenVectorOffsetType() {

if(lang_.language == IDLOptions::kCSharp) {

return "VectorOffset";

} else {

return "int";

}

}

// Generate destination type name

std::string GenTypeNameDest(const Type &type)

{

return GenTypeGet(DestinationType(type, true));

}

// Mask to turn serialized value into destination type value.

std::string DestinationMask(const Type &type, bool vectorelem) {

if (lang_.language != IDLOptions::kJava) return "";

switch (type.base_type) {

case BASE_TYPE_UCHAR: return " & 0xFF";

case BASE_TYPE_USHORT: return " & 0xFFFF";

case BASE_TYPE_UINT: return " & 0xFFFFFFFFL";

case BASE_TYPE_VECTOR:

if (vectorelem)

return DestinationMask(type.VectorType(), vectorelem);

// else fall thru:

default: return "";

}

}

// Casts necessary to correctly read serialized data

std::string DestinationCast(const Type &type) {

if (type.base_type == BASE_TYPE_VECTOR) {

return DestinationCast(type.VectorType());

} else {

switch (lang_.language) {

case IDLOptions::kJava:

// Cast necessary to correctly read serialized unsigned values.

if (type.base_type == BASE_TYPE_UINT) return "(long)";

break;

case IDLOptions::kCSharp:

// Cast from raw integral types to enum.

if (IsEnum(type)) return "(" + WrapInNameSpace(*type.enum_def) + ")";

break;

default:

break;

}

}

return "";

}

// Cast statements for mutator method parameters.

// In Java, parameters representing unsigned numbers need to be cast down to

// their respective type. For example, a long holding an unsigned int value

// would be cast down to int before being put onto the buffer. In C#, one cast

// directly cast an Enum to its underlying type, which is essential before

// putting it onto the buffer.

std::string SourceCast(const Type &type, bool castFromDest) {

if (type.base_type == BASE_TYPE_VECTOR) {

return SourceCast(type.VectorType(), castFromDest);

} else {

switch (lang_.language) {

case IDLOptions::kJava:

if (castFromDest) {

if (type.base_type == BASE_TYPE_UINT) return "(int)";

else if (type.base_type == BASE_TYPE_USHORT) return "(short)";

else if (type.base_type == BASE_TYPE_UCHAR) return "(byte)";

}

break;

case IDLOptions::kCSharp:

if (IsEnum(type)) return "(" + GenTypeBasic(type, false) + ")";

break;

default:

break;

}

}

return "";

}

std::string SourceCast(const Type &type) {

return SourceCast(type, true);

}

std::string SourceCastBasic(const Type &type, bool castFromDest) {

return IsScalar(type.base_type) ? SourceCast(type, castFromDest) : "";

}

std::string SourceCastBasic(const Type &type) {

return SourceCastBasic(type, true);

}

std::string GenEnumDefaultValue(const Value &value) {

auto enum_def = value.type.enum_def;

auto vec = enum_def->vals.vec;

auto default_value = StringToInt(value.constant.c_str());

auto result = value.constant;

for (auto it = vec.begin(); it != vec.end(); ++it) {

auto enum_val = **it;

if (enum_val.value == default_value) {

result = WrapInNameSpace(*enum_def) + "." + enum_val.name;

break;

}

}

return result;

}

std::string GenDefaultValue(const Value &value, bool enableLangOverrides) {

if (enableLangOverrides) {

// handles both enum case and vector of enum case

if (lang_.language == IDLOptions::kCSharp &&

value.type.enum_def != nullptr &&

value.type.base_type != BASE_TYPE_UNION) {

return GenEnumDefaultValue(value);

}

}

auto longSuffix = lang_.language == IDLOptions::kJava ? "L" : "";

switch (value.type.base_type) {

case BASE_TYPE_FLOAT: return value.constant + "f";

case BASE_TYPE_BOOL: return value.constant == "0" ? "false" : "true";

case BASE_TYPE_ULONG:

{

if (lang_.language != IDLOptions::kJava)

return value.constant;

// Converts the ulong into its bits signed equivalent

uint64_t defaultValue = StringToUInt(value.constant.c_str());

return NumToString(static_cast<int64_t>(defaultValue)) + longSuffix;

}

case BASE_TYPE_UINT:

case BASE_TYPE_LONG: return value.constant + longSuffix;

default: return value.constant;

}

}

std::string GenDefaultValue(const Value &value) {

return GenDefaultValue(value, true);

}

std::string GenDefaultValueBasic(const Value &value, bool enableLangOverrides) {

if (!IsScalar(value.type.base_type)) {

if (enableLangOverrides) {

if (lang_.language == IDLOptions::kCSharp) {

switch (value.type.base_type) {

case BASE_TYPE_STRING:

return "default(StringOffset)";

case BASE_TYPE_STRUCT:

return "default(Offset<" + WrapInNameSpace(*value.type.struct_def) +

">)";

case BASE_TYPE_VECTOR:

return "default(VectorOffset)";

default:

break;

}

}

}

return "0";

}

return GenDefaultValue(value, enableLangOverrides);

}

std::string GenDefaultValueBasic(const Value &value) {

return GenDefaultValueBasic(value, true);

}

void GenEnum(EnumDef &enum_def, std::string *code_ptr) {

std::string &code = *code_ptr;

if (enum_def.generated) return;

// Generate enum definitions of the form:

// public static (final) int name = value;

// In Java, we use ints rather than the Enum feature, because we want them

// to map directly to how they're used in C/C++ and file formats.

// That, and Java Enums are expensive, and not universally liked.

GenComment(enum_def.doc_comment, code_ptr, &lang_.comment_config);

code += std::string("public ") + lang_.enum_decl + enum_def.name;

if (lang_.language == IDLOptions::kCSharp) {

code += lang_.inheritance_marker +

GenTypeBasic(enum_def.underlying_type, false);

}

code += lang_.open_curly;

if (lang_.language == IDLOptions::kJava) {

code += " private " + enum_def.name + "() { }\n";

}

for (auto it = enum_def.vals.vec.begin();

it != enum_def.vals.vec.end();

++it) {

auto &ev = **it;

GenComment(ev.doc_comment, code_ptr, &lang_.comment_config, " ");

if (lang_.language != IDLOptions::kCSharp) {

code += " public static";

code += lang_.const_decl;

code += GenTypeBasic(enum_def.underlying_type, false);

}

code += " " + ev.name + " = ";

code += NumToString(ev.value);

code += lang_.enum_separator;

}

// Generate a generate string table for enum values.

// We do not do that for C# where this functionality is native.

if (lang_.language != IDLOptions::kCSharp) {

// Problem is, if values are very sparse that could generate really big

// tables. Ideally in that case we generate a map lookup instead, but for

// the moment we simply don't output a table at all.

auto range = enum_def.vals.vec.back()->value -

enum_def.vals.vec.front()->value + 1;

// Average distance between values above which we consider a table

// "too sparse". Change at will.

static const int kMaxSparseness = 5;

if (range / static_cast<int64_t>(enum_def.vals.vec.size()) < kMaxSparseness) {

code += "\n public static";

code += lang_.const_decl;

code += lang_.string_type;

code += "[] names = { ";

auto val = enum_def.vals.vec.front()->value;

for (auto it = enum_def.vals.vec.begin();

it != enum_def.vals.vec.end();

++it) {

while (val++ != (*it)->value) code += "\"\", ";

code += "\"" + (*it)->name + "\", ";

}

code += "};\n\n";

code += " public static ";

code += lang_.string_type;

code += " " + MakeCamel("name", lang_.first_camel_upper);

code += "(int e) { return names[e";

if (enum_def.vals.vec.front()->value)

code += " - " + enum_def.vals.vec.front()->name;

code += "]; }\n";

}

}

// Close the class

code += "}";

// Java does not need the closing semi-colon on class definitions.

code += (lang_.language != IDLOptions::kJava) ? ";" : "";

code += "\n\n";

}

// Returns the function name that is able to read a value of the given type.

std::string GenGetter(const Type &type) {

switch (type.base_type) {

case BASE_TYPE_STRING: return lang_.accessor_prefix + "__string";

case BASE_TYPE_STRUCT: return lang_.accessor_prefix + "__struct";

case BASE_TYPE_UNION: return lang_.accessor_prefix + "__union";

case BASE_TYPE_VECTOR: return GenGetter(type.VectorType());

default: {

std::string getter =

lang_.accessor_prefix + "bb." + FunctionStart('G') + "et";

if (type.base_type == BASE_TYPE_BOOL) {

getter = "0!=" + getter;

} else if (GenTypeBasic(type, false) != "byte") {

getter += MakeCamel(GenTypeBasic(type, false));

}

return getter;

}

}

}

// Direct mutation is only allowed for scalar fields.

// Hence a setter method will only be generated for such fields.

std::string GenSetter(const Type &type) {

if (IsScalar(type.base_type)) {

std::string setter =

lang_.accessor_prefix + "bb." + FunctionStart('P') + "ut";

if (GenTypeBasic(type, false) != "byte" &&

type.base_type != BASE_TYPE_BOOL) {

setter += MakeCamel(GenTypeBasic(type, false));

}

return setter;

} else {

return "";

}

}

// Returns the method name for use with add/put calls.

std::string GenMethod(const Type &type) {

return IsScalar(type.base_type)

? MakeCamel(GenTypeBasic(type, false))

: (IsStruct(type) ? "Struct" : "Offset");

}

// Recursively generate arguments for a constructor, to deal with nested

// structs.

void GenStructArgs(const StructDef &struct_def, std::string *code_ptr,

const char *nameprefix) {

std::string &code = *code_ptr;

for (auto it = struct_def.fields.vec.begin();

it != struct_def.fields.vec.end();

++it) {

auto &field = **it;

if (IsStruct(field.value.type)) {

// Generate arguments for a struct inside a struct. To ensure names

// don't clash, and to make it obvious these arguments are constructing

// a nested struct, prefix the name with the field name.

GenStructArgs(*field.value.type.struct_def, code_ptr,

(nameprefix + (field.name + "_")).c_str());

} else {

code += ", ";

code += GenTypeBasic(DestinationType(field.value.type, false));

code += " ";

code += nameprefix;

code += MakeCamel(field.name, lang_.first_camel_upper);

}

}

}

// Recusively generate struct construction statements of the form:

// builder.putType(name);

// and insert manual padding.

void GenStructBody(const StructDef &struct_def, std::string *code_ptr,

const char *nameprefix) {

std::string &code = *code_ptr;

code += " builder." + FunctionStart('P') + "rep(";

code += NumToString(struct_def.minalign) + ", ";

code += NumToString(struct_def.bytesize) + ");\n";

for (auto it = struct_def.fields.vec.rbegin();

it != struct_def.fields.vec.rend(); ++it) {

auto &field = **it;

if (field.padding) {

code += " builder." + FunctionStart('P') + "ad(";

code += NumToString(field.padding) + ");\n";

}

if (IsStruct(field.value.type)) {

GenStructBody(*field.value.type.struct_def, code_ptr,

(nameprefix + (field.name + "_")).c_str());

} else {

code += " builder." + FunctionStart('P') + "ut";

code += GenMethod(field.value.type) + "(";

code += SourceCast(field.value.type);

auto argname = nameprefix + MakeCamel(field.name, lang_.first_camel_upper);

code += argname;

code += ");\n";

}

}

}

std::string GenByteBufferLength(const char *bb_name) {

std::string bb_len = bb_name;

if (lang_.language == IDLOptions::kCSharp) bb_len += ".Length";

else bb_len += ".array().length";

return bb_len;

}

std::string GenOffsetGetter(flatbuffers::FieldDef *key_field,

const char *num = nullptr) {

std::string key_offset = "";

key_offset += lang_.accessor_prefix_static + "__offset(" +

NumToString(key_field->value.offset) + ", ";

if (num) {

key_offset += num;

key_offset += (lang_.language == IDLOptions::kCSharp ?

".Value, builder.DataBuffer)" : ", _bb)");

} else {

key_offset += GenByteBufferLength("bb");

key_offset += " - tableOffset, bb)";

}

return key_offset;

}

std::string GenLookupKeyGetter(flatbuffers::FieldDef *key_field) {

std::string key_getter = " ";

key_getter += "int tableOffset = " + lang_.accessor_prefix_static;

key_getter += "__indirect(vectorLocation + 4 * (start + middle)";

key_getter += ", bb);\n ";

if (key_field->value.type.base_type == BASE_TYPE_STRING) {

key_getter += "int comp = " + lang_.accessor_prefix_static;

key_getter += FunctionStart('C') + "ompareStrings(";

key_getter += GenOffsetGetter(key_field);

key_getter += ", byteKey, bb);\n";

} else {

auto get_val = GenGetter(key_field->value.type) +

"(" + GenOffsetGetter(key_field) + ")";

if (lang_.language == IDLOptions::kCSharp) {

key_getter += "int comp = " + get_val + ".CompareTo(key);\n";

} else {

key_getter += GenTypeGet(key_field->value.type) + " val = ";

key_getter += get_val + ";\n";

key_getter += " int comp = val > key ? 1 : val < key ? -1 : 0;\n";

}

}

return key_getter;

}

std::string GenKeyGetter(flatbuffers::FieldDef *key_field) {

std::string key_getter = "";

auto data_buffer = (lang_.language == IDLOptions::kCSharp) ?

"builder.DataBuffer" : "_bb";

if (key_field->value.type.base_type == BASE_TYPE_STRING) {

if (lang_.language == IDLOptions::kJava)

key_getter += " return ";

key_getter += lang_.accessor_prefix_static;

key_getter += FunctionStart('C') + "ompareStrings(";

key_getter += GenOffsetGetter(key_field, "o1") + ", ";

key_getter += GenOffsetGetter(key_field, "o2") + ", " + data_buffer + ")";

if (lang_.language == IDLOptions::kJava)

key_getter += ";";

}

else {

auto field_getter = data_buffer + GenGetter(key_field->value.type).substr(2) +

"(" + GenOffsetGetter(key_field, "o1") + ")";

if (lang_.language == IDLOptions::kCSharp) {

key_getter += field_getter;

field_getter = data_buffer + GenGetter(key_field->value.type).substr(2) +

"(" + GenOffsetGetter(key_field, "o2") + ")";

key_getter += ".CompareTo(" + field_getter + ")";

}

else {

key_getter += "\n " + GenTypeGet(key_field->value.type) + " val_1 = ";

key_getter += field_getter + ";\n " + GenTypeGet(key_field->value.type);

key_getter += " val_2 = ";

field_getter = data_buffer + GenGetter(key_field->value.type).substr(2) +

"(" + GenOffsetGetter(key_field, "o2") + ")";

key_getter += field_getter + ";\n";

key_getter += " return val_1 > val_2 ? 1 : val_1 < val_2 ? -1 : 0;\n ";

}

}

return key_getter;

}

void GenStruct(StructDef &struct_def, std::string *code_ptr) {

if (struct_def.generated) return;

std::string &code = *code_ptr;

// Generate a struct accessor class, with methods of the form:

// public type name() { return bb.getType(i + offset); }

// or for tables of the form:

// public type name() {

// int o = __offset(offset); return o != 0 ? bb.getType(o + i) : default;

// }

GenComment(struct_def.doc_comment, code_ptr, &lang_.comment_config);

code += "public ";

if (lang_.language == IDLOptions::kCSharp &&

struct_def.attributes.Lookup("csharp_partial")) {

// generate a partial class for this C# struct/table

code += "partial ";

} else {

code += lang_.unsubclassable_decl;

}

code += lang_.accessor_type + struct_def.name;

if (lang_.language == IDLOptions::kCSharp) {

code += " : IFlatbufferObject";

code += lang_.open_curly;

code += " private ";

code += struct_def.fixed ? "Struct" : "Table";

code += " __p;\n";

if (lang_.language == IDLOptions::kCSharp) {

code += " public ByteBuffer ByteBuffer { get { return __p.bb; } }\n";

}

} else {

code += lang_.inheritance_marker;

code += struct_def.fixed ? "Struct" : "Table";

code += lang_.open_curly;

}

if (!struct_def.fixed) {

// Generate a special accessor for the table that when used as the root

// of a FlatBuffer

std::string method_name = FunctionStart('G') + "etRootAs" + struct_def.name;

std::string method_signature = " public static " + struct_def.name + " " +

method_name;

// create convenience method that doesn't require an existing object

code += method_signature + "(ByteBuffer _bb) ";

code += "{ return " + method_name + "(_bb, new " + struct_def.name+ "()); }\n";

// create method that allows object reuse

code += method_signature + "(ByteBuffer _bb, " + struct_def.name + " obj) { ";

code += lang_.set_bb_byteorder;

code += "return (obj.__assign(_bb." + FunctionStart('G') + "etInt(_bb.";

code += lang_.get_bb_position;

code += ") + _bb.";

code += lang_.get_bb_position;

code += ", _bb)); }\n";

if (parser_.root_struct_def_ == &struct_def) {

if (parser_.file_identifier_.length()) {

// Check if a buffer has the identifier.

code += " public static ";

code += lang_.bool_type + struct_def.name;

code += "BufferHasIdentifier(ByteBuffer _bb) { return ";

code += lang_.accessor_prefix_static + "__has_identifier(_bb, \"";

code += parser_.file_identifier_;

code += "\"); }\n";

}

}

}

// Generate the __init method that sets the field in a pre-existing

// accessor object. This is to allow object reuse.

code += " public void __init(int _i, ByteBuffer _bb) ";

code += "{ " + lang_.accessor_prefix + "bb_pos = _i; ";

code += lang_.accessor_prefix + "bb = _bb; }\n";

code += " public " + struct_def.name + " __assign(int _i, ByteBuffer _bb) ";

code += "{ __init(_i, _bb); return this; }\n\n";

for (auto it = struct_def.fields.vec.begin();

it != struct_def.fields.vec.end();

++it) {

auto &field = **it;

if (field.deprecated) continue;

GenComment(field.doc_comment, code_ptr, &lang_.comment_config, " ");

std::string type_name = GenTypeGet(field.value.type);

std::string type_name_dest = GenTypeNameDest(field.value.type);

std::string conditional_cast = "";

std::string optional = "";

if (lang_.language == IDLOptions::kCSharp &&

!struct_def.fixed &&

(field.value.type.base_type == BASE_TYPE_STRUCT ||

field.value.type.base_type == BASE_TYPE_UNION ||

(field.value.type.base_type == BASE_TYPE_VECTOR &&

field.value.type.element == BASE_TYPE_STRUCT))) {

optional = lang_.optional_suffix;

conditional_cast = "(" + type_name_dest + optional + ")";

}

std::string dest_mask = DestinationMask(field.value.type, true);

std::string dest_cast = DestinationCast(field.value.type);

std::string src_cast = SourceCast(field.value.type);

std::string method_start = " public " + type_name_dest + optional + " " +

MakeCamel(field.name, lang_.first_camel_upper);

std::string obj = lang_.language == IDLOptions::kCSharp

? "(new " + type_name + "())"

: "obj";

// Most field accessors need to retrieve and test the field offset first,

// this is the prefix code for that:

auto offset_prefix = " { int o = " + lang_.accessor_prefix + "__offset(" +

NumToString(field.value.offset) +

"); return o != 0 ? ";

// Generate the accessors that don't do object reuse.

if (field.value.type.base_type == BASE_TYPE_STRUCT) {

// Calls the accessor that takes an accessor object with a new object.

if (lang_.language != IDLOptions::kCSharp) {

code += method_start + "() { return ";

code += MakeCamel(field.name, lang_.first_camel_upper);

code += "(new ";

code += type_name + "()); }\n";

}

} else if (field.value.type.base_type == BASE_TYPE_VECTOR &&

field.value.type.element == BASE_TYPE_STRUCT) {

// Accessors for vectors of structs also take accessor objects, this

// generates a variant without that argument.

if (lang_.language != IDLOptions::kCSharp) {

code += method_start + "(int j) { return ";

code += MakeCamel(field.name, lang_.first_camel_upper);

code += "(new " + type_name + "(), j); }\n";

}

} else if (field.value.type.base_type == BASE_TYPE_UNION) {

if (lang_.language == IDLOptions::kCSharp) {

// Union types in C# use generic Table-derived type for better type

// safety.

method_start += "<TTable>";

type_name = type_name_dest;

}

}

std::string getter = dest_cast + GenGetter(field.value.type);

code += method_start;

std::string default_cast = "";

// only create default casts for c# scalars or vectors of scalars

if (lang_.language == IDLOptions::kCSharp &&

(IsScalar(field.value.type.base_type) ||

(field.value.type.base_type == BASE_TYPE_VECTOR &&

IsScalar(field.value.type.element)))) {

// For scalars, default value will be returned by GetDefaultValue().

// If the scalar is an enum, GetDefaultValue() returns an actual c# enum

// that doesn't need to be casted. However, default values for enum

// elements of vectors are integer literals ("0") and are still casted

// for clarity.

if (field.value.type.enum_def == nullptr ||

field.value.type.base_type == BASE_TYPE_VECTOR) {

default_cast = "(" + type_name_dest + ")";

}

}

std::string member_suffix = "; ";

if (IsScalar(field.value.type.base_type)) {

code += lang_.getter_prefix;

member_suffix += lang_.getter_suffix;

if (struct_def.fixed) {

code += " { return " + getter;

code += "(" + lang_.accessor_prefix + "bb_pos + ";

code += NumToString(field.value.offset) + ")";

code += dest_mask;

} else {

code += offset_prefix + getter;

code += "(o + " + lang_.accessor_prefix + "bb_pos)" + dest_mask;

code += " : " + default_cast;

code += GenDefaultValue(field.value);

}

} else {

switch (field.value.type.base_type) {

case BASE_TYPE_STRUCT:

if (lang_.language != IDLOptions::kCSharp) {

code += "(" + type_name + " obj" + ")";

} else {

code += lang_.getter_prefix;

member_suffix += lang_.getter_suffix;

}

if (struct_def.fixed) {

code += " { return " + obj + ".__assign(" + lang_.accessor_prefix;

code += "bb_pos + " + NumToString(field.value.offset) + ", ";

code += lang_.accessor_prefix + "bb)";

} else {

code += offset_prefix + conditional_cast;

code += obj + ".__assign(";

code += field.value.type.struct_def->fixed

? "o + " + lang_.accessor_prefix + "bb_pos"

: lang_.accessor_prefix + "__indirect(o + " +

lang_.accessor_prefix + "bb_pos)";

code += ", " + lang_.accessor_prefix + "bb) : null";

}

break;

case BASE_TYPE_STRING:

code += lang_.getter_prefix;

member_suffix += lang_.getter_suffix;

code += offset_prefix + getter + "(o + " + lang_.accessor_prefix;

code += "bb_pos) : null";

break;

case BASE_TYPE_VECTOR: {

auto vectortype = field.value.type.VectorType();

code += "(";

if (vectortype.base_type == BASE_TYPE_STRUCT) {

if (lang_.language != IDLOptions::kCSharp)

code += type_name + " obj, ";

getter = obj + ".__assign";