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/*
* 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/code_generators.h"
#include "flatbuffers/flatbuffers.h"
#include "flatbuffers/idl.h"
#include "flatbuffers/util.h"
namespace flatbuffers {
static std::string GenType(const Type &type, bool underlying = false) {
switch (type.base_type) {
case BASE_TYPE_STRUCT:
return type.struct_def->defined_namespace->GetFullyQualifiedName(
type.struct_def->name);
case BASE_TYPE_VECTOR: return "[" + GenType(type.VectorType()) + "]";
default:
if (type.enum_def && !underlying) {
return type.enum_def->defined_namespace->GetFullyQualifiedName(
type.enum_def->name);
} else {
return kTypeNames[type.base_type];
}
}
}
static void GenNameSpace(const Namespace &name_space, std::string *_schema,
const Namespace **last_namespace) {
if (*last_namespace == &name_space) return;
*last_namespace = &name_space;
auto &schema = *_schema;
schema += "namespace ";
for (auto it = name_space.components.begin();
it != name_space.components.end(); ++it) {
if (it != name_space.components.begin()) schema += ".";
schema += *it;
}
schema += ";\n\n";
}
// Generate a flatbuffer schema from the Parser's internal representation.
std::string GenerateFBS(const Parser &parser, const std::string &file_name) {
// Proto namespaces may clash with table names, escape the ones that were
// generated from a table:
for (auto it = parser.namespaces_.begin(); it != parser.namespaces_.end();
++it) {
auto &ns = **it;
for (size_t i = 0; i < ns.from_table; i++) {
ns.components[ns.components.size() - 1 - i] += "_";
}
}
std::string schema;
schema += "// Generated from " + file_name + ".proto\n\n";
if (parser.opts.include_dependence_headers) {
// clang-format off
#ifdef FBS_GEN_INCLUDES // TODO: currently all in one file.
int num_includes = 0;
for (auto it = parser.included_files_.begin();
it != parser.included_files_.end(); ++it) {
if (it->second.empty())
continue;
auto basename = flatbuffers::StripPath(
flatbuffers::StripExtension(it->second));
schema += "include \"" + basename + ".fbs\";\n";
num_includes++;
}
if (num_includes) schema += "\n";
#endif
// clang-format on
}
// Generate code for all the enum declarations.
const Namespace *last_namespace = nullptr;
for (auto enum_def_it = parser.enums_.vec.begin();
enum_def_it != parser.enums_.vec.end(); ++enum_def_it) {
EnumDef &enum_def = **enum_def_it;
GenNameSpace(*enum_def.defined_namespace, &schema, &last_namespace);
GenComment(enum_def.doc_comment, &schema, nullptr);
if (enum_def.is_union)
schema += "union " + enum_def.name;
else
schema += "enum " + enum_def.name + " : ";
schema += GenType(enum_def.underlying_type, true) + " {\n";
for (auto it = enum_def.Vals().begin(); it != enum_def.Vals().end(); ++it) {
auto &ev = **it;
GenComment(ev.doc_comment, &schema, nullptr, " ");
if (enum_def.is_union)
schema += " " + GenType(ev.union_type) + ",\n";
else
schema += " " + ev.name + " = " + NumToString(ev.value) + ",\n";
}
schema += "}\n\n";
}
// Generate code for all structs/tables.
for (auto it = parser.structs_.vec.begin(); it != parser.structs_.vec.end();
++it) {
StructDef &struct_def = **it;
GenNameSpace(*struct_def.defined_namespace, &schema, &last_namespace);
GenComment(struct_def.doc_comment, &schema, nullptr);
schema += "table " + struct_def.name + " {\n";
for (auto field_it = struct_def.fields.vec.begin();
field_it != struct_def.fields.vec.end(); ++field_it) {
auto &field = **field_it;
if (field.value.type.base_type != BASE_TYPE_UTYPE) {
GenComment(field.doc_comment, &schema, nullptr, " ");
schema += " " + field.name + ":" + GenType(field.value.type);
if (field.value.constant != "0") schema += " = " + field.value.constant;
if (field.required) schema += " (required)";
schema += ";\n";
}
}
schema += "}\n\n";
}
return schema;
}
bool GenerateFBS(const Parser &parser, const std::string &path,
const std::string &file_name) {
return SaveFile((path + file_name + ".fbs").c_str(),
GenerateFBS(parser, file_name), false);
}
} // namespace flatbuffers
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