mirror of
https://github.com/u0u0/Cocos2d-Lua-Community.git
synced 2026-05-10 07:46:11 +08:00
645 lines
24 KiB
C++
645 lines
24 KiB
C++
/*
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* Copyright 2014 Google Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// independent from idl_parser, since this code is not needed for most clients
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#include "flatbuffers/flatbuffers.h"
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#include "flatbuffers/idl.h"
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#include "flatbuffers/util.h"
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namespace flatbuffers {
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// Convert an underscore_based_indentifier in to camelCase.
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// Also uppercases the first character if first is true.
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std::string MakeCamel(const std::string &in, bool first) {
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std::string s;
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for (size_t i = 0; i < in.length(); i++) {
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if (!i && first)
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s += static_cast<char>(toupper(in[0]));
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else if (in[i] == '_' && i + 1 < in.length())
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s += static_cast<char>(toupper(in[++i]));
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else
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s += in[i];
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}
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return s;
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}
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// Generate a documentation comment, if available.
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void GenComment(const std::vector<std::string> &dc, std::string *code_ptr,
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const char *prefix) {
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std::string &code = *code_ptr;
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for (auto it = dc.begin();
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it != dc.end();
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++it) {
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code += std::string(prefix) + "///" + *it + "\n";
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}
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}
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// These arrays need to correspond to the GeneratorOptions::k enum.
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struct LanguageParameters {
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GeneratorOptions::Language language;
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// Whether function names in the language typically start with uppercase.
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bool first_camel_upper;
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const char *file_extension;
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const char *string_type;
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const char *bool_type;
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const char *open_curly;
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const char *const_decl;
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const char *inheritance_marker;
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const char *namespace_ident;
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const char *namespace_begin;
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const char *namespace_end;
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const char *set_bb_byteorder;
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const char *includes;
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};
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LanguageParameters language_parameters[] = {
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{
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GeneratorOptions::kJava,
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false,
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".java",
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"String",
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"boolean ",
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" {\n",
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" final ",
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" extends ",
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"package ",
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";",
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"",
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"_bb.order(ByteOrder.LITTLE_ENDIAN); ",
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"import java.nio.*;\nimport java.lang.*;\nimport java.util.*;\n"
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"import com.google.flatbuffers.*;\n\n",
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},
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{
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GeneratorOptions::kCSharp,
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true,
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".cs",
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"string",
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"bool ",
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"\n{\n",
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" readonly ",
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" : ",
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"namespace ",
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"\n{",
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"\n}\n",
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"",
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"using FlatBuffers;\n\n",
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}
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};
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static_assert(sizeof(language_parameters) / sizeof(LanguageParameters) ==
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GeneratorOptions::kMAX,
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"Please add extra elements to the arrays above.");
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static std::string FunctionStart(const LanguageParameters &lang, char upper) {
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return std::string() +
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(lang.language == GeneratorOptions::kJava
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? static_cast<char>(tolower(upper))
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: upper);
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}
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static std::string GenTypeBasic(const LanguageParameters &lang,
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const Type &type) {
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static const char *gtypename[] = {
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#define FLATBUFFERS_TD(ENUM, IDLTYPE, CTYPE, JTYPE, GTYPE, NTYPE) \
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#JTYPE, #NTYPE,
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FLATBUFFERS_GEN_TYPES(FLATBUFFERS_TD)
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#undef FLATBUFFERS_TD
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};
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return gtypename[type.base_type * GeneratorOptions::kMAX + lang.language];
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}
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static std::string GenTypeGet(const LanguageParameters &lang,
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const Type &type);
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static std::string GenTypePointer(const LanguageParameters &lang,
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const Type &type) {
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switch (type.base_type) {
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case BASE_TYPE_STRING:
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return lang.string_type;
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case BASE_TYPE_VECTOR:
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return GenTypeGet(lang, type.VectorType());
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case BASE_TYPE_STRUCT:
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return type.struct_def->name;
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case BASE_TYPE_UNION:
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// fall through
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default:
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return "Table";
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}
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}
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static std::string GenTypeGet(const LanguageParameters &lang,
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const Type &type) {
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return IsScalar(type.base_type)
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? GenTypeBasic(lang, type)
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: GenTypePointer(lang, type);
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}
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static void GenEnum(const LanguageParameters &lang, EnumDef &enum_def,
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std::string *code_ptr) {
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std::string &code = *code_ptr;
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if (enum_def.generated) return;
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// Generate enum definitions of the form:
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// public static (final) int name = value;
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// In Java, we use ints rather than the Enum feature, because we want them
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// to map directly to how they're used in C/C++ and file formats.
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// That, and Java Enums are expensive, and not universally liked.
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GenComment(enum_def.doc_comment, code_ptr);
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code += "public class " + enum_def.name + lang.open_curly;
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for (auto it = enum_def.vals.vec.begin();
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it != enum_def.vals.vec.end();
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++it) {
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auto &ev = **it;
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GenComment(ev.doc_comment, code_ptr, " ");
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code += " public static";
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code += lang.const_decl;
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code += GenTypeBasic(lang, enum_def.underlying_type);
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code += " " + ev.name + " = ";
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code += NumToString(ev.value) + ";\n";
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}
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// Generate a generate string table for enum values.
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// Problem is, if values are very sparse that could generate really big
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// tables. Ideally in that case we generate a map lookup instead, but for
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// the moment we simply don't output a table at all.
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auto range = enum_def.vals.vec.back()->value -
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enum_def.vals.vec.front()->value + 1;
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// Average distance between values above which we consider a table
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// "too sparse". Change at will.
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static const int kMaxSparseness = 5;
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if (range / static_cast<int64_t>(enum_def.vals.vec.size()) < kMaxSparseness) {
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code += "\n private static";
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code += lang.const_decl;
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code += lang.string_type;
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code += "[] names = { ";
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auto val = enum_def.vals.vec.front()->value;
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for (auto it = enum_def.vals.vec.begin();
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it != enum_def.vals.vec.end();
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++it) {
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while (val++ != (*it)->value) code += "\"\", ";
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code += "\"" + (*it)->name + "\", ";
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}
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code += "};\n\n";
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code += " public static ";
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code += lang.string_type;
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code += " " + MakeCamel("name", lang.first_camel_upper);
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code += "(int e) { return names[e";
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if (enum_def.vals.vec.front()->value)
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code += " - " + enum_def.vals.vec.front()->name;
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code += "]; }\n";
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}
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// Close the class
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code += "};\n\n";
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}
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// Returns the function name that is able to read a value of the given type.
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static std::string GenGetter(const LanguageParameters &lang,
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const Type &type) {
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switch (type.base_type) {
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case BASE_TYPE_STRING: return "__string";
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case BASE_TYPE_STRUCT: return "__struct";
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case BASE_TYPE_UNION: return "__union";
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case BASE_TYPE_VECTOR: return GenGetter(lang, type.VectorType());
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default:
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return "bb." + FunctionStart(lang, 'G') + "et" +
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(GenTypeBasic(lang, type) != "byte"
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? MakeCamel(GenTypeGet(lang, type))
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: "");
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}
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}
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// Returns the method name for use with add/put calls.
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static std::string GenMethod(const LanguageParameters &lang, const Type &type) {
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return IsScalar(type.base_type)
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? MakeCamel(GenTypeBasic(lang, type))
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: (IsStruct(type) ? "Struct" : "Offset");
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}
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// Recursively generate arguments for a constructor, to deal with nested
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// structs.
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static void GenStructArgs(const LanguageParameters &lang,
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const StructDef &struct_def,
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std::string *code_ptr, const char *nameprefix) {
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std::string &code = *code_ptr;
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for (auto it = struct_def.fields.vec.begin();
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it != struct_def.fields.vec.end();
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++it) {
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auto &field = **it;
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if (IsStruct(field.value.type)) {
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// Generate arguments for a struct inside a struct. To ensure names
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// don't clash, and to make it obvious these arguments are constructing
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// a nested struct, prefix the name with the struct name.
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GenStructArgs(lang, *field.value.type.struct_def, code_ptr,
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(field.value.type.struct_def->name + "_").c_str());
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} else {
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code += ", " + GenTypeBasic(lang, field.value.type) + " " + nameprefix;
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code += MakeCamel(field.name, lang.first_camel_upper);
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}
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}
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}
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// Recusively generate struct construction statements of the form:
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// builder.putType(name);
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// and insert manual padding.
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static void GenStructBody(const LanguageParameters &lang,
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const StructDef &struct_def,
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std::string *code_ptr, const char *nameprefix) {
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std::string &code = *code_ptr;
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code += " builder." + FunctionStart(lang, 'P') + "rep(";
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code += NumToString(struct_def.minalign) + ", ";
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code += NumToString(struct_def.bytesize) + ");\n";
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for (auto it = struct_def.fields.vec.rbegin();
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it != struct_def.fields.vec.rend(); ++it) {
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auto &field = **it;
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if (field.padding) {
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code += " builder." + FunctionStart(lang, 'P') + "ad(";
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code += NumToString(field.padding) + ");\n";
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}
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if (IsStruct(field.value.type)) {
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GenStructBody(lang, *field.value.type.struct_def, code_ptr,
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(field.value.type.struct_def->name + "_").c_str());
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} else {
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code += " builder." + FunctionStart(lang, 'P') + "ut";
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code += GenMethod(lang, field.value.type) + "(" += nameprefix;
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code += MakeCamel(field.name, lang.first_camel_upper) + ");\n";
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}
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}
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}
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static void GenStruct(const LanguageParameters &lang, const Parser &parser,
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StructDef &struct_def, std::string *code_ptr) {
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if (struct_def.generated) return;
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std::string &code = *code_ptr;
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// Generate a struct accessor class, with methods of the form:
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// public type name() { return bb.getType(i + offset); }
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// or for tables of the form:
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// public type name() {
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// int o = __offset(offset); return o != 0 ? bb.getType(o + i) : default;
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// }
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GenComment(struct_def.doc_comment, code_ptr);
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code += "public class " + struct_def.name + lang.inheritance_marker;
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code += struct_def.fixed ? "Struct" : "Table";
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code += " {\n";
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if (!struct_def.fixed) {
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// Generate a special accessor for the table that when used as the root
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// of a FlatBuffer
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code += " public static " + struct_def.name + " ";
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code += FunctionStart(lang, 'G') + "etRootAs" + struct_def.name;
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code += "(ByteBuffer _bb) { ";
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code += lang.set_bb_byteorder;
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code += "return (new " + struct_def.name;
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code += "()).__init(_bb." + FunctionStart(lang, 'G');
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code += "etInt(_bb.position()) + _bb.position(), _bb); }\n";
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if (parser.root_struct_def == &struct_def) {
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if (parser.file_identifier_.length()) {
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// Check if a buffer has the identifier.
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code += " public static ";
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code += lang.bool_type + struct_def.name;
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code += "BufferHasIdentifier(ByteBuffer _bb) { return ";
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code += "__has_identifier(_bb, \"" + parser.file_identifier_;
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code += "\"); }\n";
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}
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}
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}
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// Generate the __init method that sets the field in a pre-existing
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// accessor object. This is to allow object reuse.
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code += " public " + struct_def.name;
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code += " __init(int _i, ByteBuffer _bb) ";
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code += "{ bb_pos = _i; bb = _bb; return this; }\n\n";
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for (auto it = struct_def.fields.vec.begin();
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it != struct_def.fields.vec.end();
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++it) {
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auto &field = **it;
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if (field.deprecated) continue;
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GenComment(field.doc_comment, code_ptr, " ");
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std::string type_name = GenTypeGet(lang, field.value.type);
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std::string method_start = " public " + type_name + " " +
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MakeCamel(field.name, lang.first_camel_upper);
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// Generate the accessors that don't do object reuse.
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if (field.value.type.base_type == BASE_TYPE_STRUCT) {
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// Calls the accessor that takes an accessor object with a new object.
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code += method_start + "() { return ";
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code += MakeCamel(field.name, lang.first_camel_upper);
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code += "(new ";
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code += type_name + "()); }\n";
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} else if (field.value.type.base_type == BASE_TYPE_VECTOR &&
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field.value.type.element == BASE_TYPE_STRUCT) {
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// Accessors for vectors of structs also take accessor objects, this
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// generates a variant without that argument.
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code += method_start + "(int j) { return ";
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code += MakeCamel(field.name, lang.first_camel_upper);
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code += "(new ";
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code += type_name + "(), j); }\n";
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}
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std::string getter = GenGetter(lang, field.value.type);
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code += method_start + "(";
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// Most field accessors need to retrieve and test the field offset first,
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// this is the prefix code for that:
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auto offset_prefix = ") { int o = __offset(" +
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NumToString(field.value.offset) +
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"); return o != 0 ? ";
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std::string default_cast = "";
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if (lang.language == GeneratorOptions::kCSharp)
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default_cast = "(" + type_name + ")";
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if (IsScalar(field.value.type.base_type)) {
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if (struct_def.fixed) {
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code += ") { return " + getter;
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code += "(bb_pos + " + NumToString(field.value.offset) + ")";
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} else {
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code += offset_prefix + getter;
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code += "(o + bb_pos) : " + default_cast + field.value.constant;
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}
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} else {
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switch (field.value.type.base_type) {
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case BASE_TYPE_STRUCT:
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code += type_name + " obj";
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if (struct_def.fixed) {
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code += ") { return obj.__init(bb_pos + ";
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code += NumToString(field.value.offset) + ", bb)";
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} else {
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code += offset_prefix;
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code += "obj.__init(";
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code += field.value.type.struct_def->fixed
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? "o + bb_pos"
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: "__indirect(o + bb_pos)";
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code += ", bb) : null";
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}
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break;
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case BASE_TYPE_STRING:
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code += offset_prefix + getter +"(o + bb_pos) : null";
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break;
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case BASE_TYPE_VECTOR: {
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auto vectortype = field.value.type.VectorType();
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if (vectortype.base_type == BASE_TYPE_STRUCT) {
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code += type_name + " obj, ";
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getter = "obj.__init";
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}
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code += "int j" + offset_prefix + getter +"(";
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auto index = "__vector(o) + j * " +
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NumToString(InlineSize(vectortype));
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if (vectortype.base_type == BASE_TYPE_STRUCT) {
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code += vectortype.struct_def->fixed
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? index
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: "__indirect(" + index + ")";
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code += ", bb";
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} else {
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code += index;
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}
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code += ") : ";
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code += IsScalar(field.value.type.element)
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? default_cast + "0"
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: "null";
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break;
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}
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case BASE_TYPE_UNION:
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code += type_name + " obj" + offset_prefix + getter;
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code += "(obj, o) : null";
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break;
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default:
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assert(0);
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}
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}
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code += "; }\n";
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if (field.value.type.base_type == BASE_TYPE_VECTOR) {
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code += " public int " + MakeCamel(field.name, lang.first_camel_upper);
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code += "Length(" + offset_prefix;
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code += "__vector_len(o) : 0; }\n";
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}
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if ((field.value.type.base_type == BASE_TYPE_VECTOR ||
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field.value.type.base_type == BASE_TYPE_STRING) &&
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lang.language == GeneratorOptions::kJava) {
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code += " public ByteBuffer ";
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code += MakeCamel(field.name, lang.first_camel_upper);
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code += "AsByteBuffer() { return __vector_as_bytebuffer(";
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code += NumToString(field.value.offset) + ", ";
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code += NumToString(field.value.type.base_type == BASE_TYPE_STRING ? 1 :
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InlineSize(field.value.type.VectorType()));
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code += "); }\n";
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}
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}
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code += "\n";
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if (struct_def.fixed) {
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// create a struct constructor function
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code += " public static int " + FunctionStart(lang, 'C') + "reate";
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code += struct_def.name + "(FlatBufferBuilder builder";
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GenStructArgs(lang, struct_def, code_ptr, "");
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code += ") {\n";
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GenStructBody(lang, struct_def, code_ptr, "");
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code += " return builder.";
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code += FunctionStart(lang, 'O') + "ffset();\n }\n";
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} else {
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// Generate a method that creates a table in one go. This is only possible
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// when the table has no struct fields, since those have to be created
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// inline, and there's no way to do so in Java.
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bool has_no_struct_fields = true;
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int num_fields = 0;
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for (auto it = struct_def.fields.vec.begin();
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it != struct_def.fields.vec.end(); ++it) {
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auto &field = **it;
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if (field.deprecated) continue;
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if (IsStruct(field.value.type)) {
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has_no_struct_fields = false;
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} else {
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num_fields++;
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}
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}
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if (has_no_struct_fields && num_fields) {
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// Generate a table constructor of the form:
|
|
// public static void createName(FlatBufferBuilder builder, args...)
|
|
code += " public static int " + FunctionStart(lang, 'C') + "reate";
|
|
code += struct_def.name;
|
|
code += "(FlatBufferBuilder builder";
|
|
for (auto it = struct_def.fields.vec.begin();
|
|
it != struct_def.fields.vec.end(); ++it) {
|
|
auto &field = **it;
|
|
if (field.deprecated) continue;
|
|
code += ",\n " + GenTypeBasic(lang, field.value.type) + " ";
|
|
code += field.name;
|
|
// Java doesn't have defaults, which means this method must always
|
|
// supply all arguments, and thus won't compile when fields are added.
|
|
if (lang.language != GeneratorOptions::kJava)
|
|
code += " = " + field.value.constant;
|
|
}
|
|
code += ") {\n builder.";
|
|
code += FunctionStart(lang, 'S') + "tartObject(";
|
|
code += NumToString(struct_def.fields.vec.size()) + ");\n";
|
|
for (size_t size = struct_def.sortbysize ? sizeof(largest_scalar_t) : 1;
|
|
size;
|
|
size /= 2) {
|
|
for (auto it = struct_def.fields.vec.rbegin();
|
|
it != struct_def.fields.vec.rend(); ++it) {
|
|
auto &field = **it;
|
|
if (!field.deprecated &&
|
|
(!struct_def.sortbysize ||
|
|
size == SizeOf(field.value.type.base_type))) {
|
|
code += " " + struct_def.name + ".";
|
|
code += FunctionStart(lang, 'A') + "dd";
|
|
code += MakeCamel(field.name) + "(builder, " + field.name + ");\n";
|
|
}
|
|
}
|
|
}
|
|
code += " return " + struct_def.name + ".";
|
|
code += FunctionStart(lang, 'E') + "nd" + struct_def.name;
|
|
code += "(builder);\n }\n\n";
|
|
}
|
|
// Generate a set of static methods that allow table construction,
|
|
// of the form:
|
|
// public static void addName(FlatBufferBuilder builder, short name)
|
|
// { builder.addShort(id, name, default); }
|
|
// Unlike the Create function, these always work.
|
|
code += " public static void " + FunctionStart(lang, 'S') + "tart";
|
|
code += struct_def.name;
|
|
code += "(FlatBufferBuilder builder) { builder.";
|
|
code += FunctionStart(lang, 'S') + "tartObject(";
|
|
code += NumToString(struct_def.fields.vec.size()) + "); }\n";
|
|
for (auto it = struct_def.fields.vec.begin();
|
|
it != struct_def.fields.vec.end(); ++it) {
|
|
auto &field = **it;
|
|
if (field.deprecated) continue;
|
|
code += " public static void " + FunctionStart(lang, 'A') + "dd";
|
|
code += MakeCamel(field.name);
|
|
code += "(FlatBufferBuilder builder, ";
|
|
code += GenTypeBasic(lang, field.value.type);
|
|
auto argname = MakeCamel(field.name, false);
|
|
if (!IsScalar(field.value.type.base_type)) argname += "Offset";
|
|
code += " " + argname + ") { builder." + FunctionStart(lang, 'A') + "dd";
|
|
code += GenMethod(lang, field.value.type) + "(";
|
|
code += NumToString(it - struct_def.fields.vec.begin()) + ", ";
|
|
code += argname + ", " + field.value.constant;
|
|
code += "); }\n";
|
|
if (field.value.type.base_type == BASE_TYPE_VECTOR) {
|
|
auto vector_type = field.value.type.VectorType();
|
|
auto alignment = InlineAlignment(vector_type);
|
|
auto elem_size = InlineSize(vector_type);
|
|
if (!IsStruct(vector_type)) {
|
|
// Generate a method to create a vector from a Java array.
|
|
code += " public static int " + FunctionStart(lang, 'C') + "reate";
|
|
code += MakeCamel(field.name);
|
|
code += "Vector(FlatBufferBuilder builder, ";
|
|
code += GenTypeBasic(lang, vector_type) + "[] data) ";
|
|
code += "{ builder." + FunctionStart(lang, 'S') + "tartVector(";
|
|
code += NumToString(elem_size);
|
|
code += ", data." + FunctionStart(lang, 'L') + "ength, ";
|
|
code += NumToString(alignment);
|
|
code += "); for (int i = data.";
|
|
code += FunctionStart(lang, 'L') + "ength - 1; i >= 0; i--) builder.";
|
|
code += FunctionStart(lang, 'A') + "dd";
|
|
code += GenMethod(lang, vector_type);
|
|
code += "(data[i]); return builder.";
|
|
code += FunctionStart(lang, 'E') + "ndVector(); }\n";
|
|
}
|
|
// Generate a method to start a vector, data to be added manually after.
|
|
code += " public static void " + FunctionStart(lang, 'S') + "tart";
|
|
code += MakeCamel(field.name);
|
|
code += "Vector(FlatBufferBuilder builder, int numElems) ";
|
|
code += "{ builder." + FunctionStart(lang, 'S') + "tartVector(";
|
|
code += NumToString(elem_size);
|
|
code += ", numElems, " + NumToString(alignment);
|
|
code += "); }\n";
|
|
}
|
|
}
|
|
code += " public static int ";
|
|
code += FunctionStart(lang, 'E') + "nd" + struct_def.name;
|
|
code += "(FlatBufferBuilder builder) {\n int o = builder.";
|
|
code += FunctionStart(lang, 'E') + "ndObject();\n";
|
|
for (auto it = struct_def.fields.vec.begin();
|
|
it != struct_def.fields.vec.end();
|
|
++it) {
|
|
auto &field = **it;
|
|
if (!field.deprecated && field.required) {
|
|
code += " builder." + FunctionStart(lang, 'R') + "equired(o, ";
|
|
code += NumToString(field.value.offset);
|
|
code += "); // " + field.name + "\n";
|
|
}
|
|
}
|
|
code += " return o;\n }\n";
|
|
if (parser.root_struct_def == &struct_def) {
|
|
code += " public static void ";
|
|
code += FunctionStart(lang, 'F') + "inish" + struct_def.name;
|
|
code += "Buffer(FlatBufferBuilder builder, int offset) { ";
|
|
code += "builder." + FunctionStart(lang, 'F') + "inish(offset";
|
|
if (parser.file_identifier_.length())
|
|
code += ", \"" + parser.file_identifier_ + "\"";
|
|
code += "); }\n";
|
|
}
|
|
}
|
|
code += "};\n\n";
|
|
}
|
|
|
|
// Save out the generated code for a single class while adding
|
|
// declaration boilerplate.
|
|
static bool SaveClass(const LanguageParameters &lang, const Parser &parser,
|
|
const Definition &def, const std::string &classcode,
|
|
const std::string &path, bool needs_includes) {
|
|
if (!classcode.length()) return true;
|
|
|
|
std::string namespace_general;
|
|
std::string namespace_dir = path;
|
|
auto &namespaces = parser.namespaces_.back()->components;
|
|
for (auto it = namespaces.begin(); it != namespaces.end(); ++it) {
|
|
if (namespace_general.length()) {
|
|
namespace_general += ".";
|
|
namespace_dir += kPathSeparator;
|
|
}
|
|
namespace_general += *it;
|
|
namespace_dir += *it;
|
|
}
|
|
EnsureDirExists(namespace_dir);
|
|
|
|
std::string code = "// automatically generated, do not modify\n\n";
|
|
code += lang.namespace_ident + namespace_general + lang.namespace_begin;
|
|
code += "\n\n";
|
|
if (needs_includes) code += lang.includes;
|
|
code += classcode;
|
|
code += lang.namespace_end;
|
|
auto filename = namespace_dir + kPathSeparator + def.name +
|
|
lang.file_extension;
|
|
return SaveFile(filename.c_str(), code, false);
|
|
}
|
|
|
|
bool GenerateGeneral(const Parser &parser,
|
|
const std::string &path,
|
|
const std::string & /*file_name*/,
|
|
const GeneratorOptions &opts) {
|
|
|
|
assert(opts.lang <= GeneratorOptions::kMAX);
|
|
auto lang = language_parameters[opts.lang];
|
|
|
|
for (auto it = parser.enums_.vec.begin();
|
|
it != parser.enums_.vec.end(); ++it) {
|
|
std::string enumcode;
|
|
GenEnum(lang, **it, &enumcode);
|
|
if (!SaveClass(lang, parser, **it, enumcode, path, false))
|
|
return false;
|
|
}
|
|
|
|
for (auto it = parser.structs_.vec.begin();
|
|
it != parser.structs_.vec.end(); ++it) {
|
|
std::string declcode;
|
|
GenStruct(lang, parser, **it, &declcode);
|
|
if (!SaveClass(lang, parser, **it, declcode, path, true))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
} // namespace flatbuffers
|