1 /* 2 * Copyright 2014 Google Inc. All rights reserved. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 // independent from idl_parser, since this code is not needed for most clients 18 19 #include "flatbuffers/flatbuffers.h" 20 #include "flatbuffers/idl.h" 21 #include "flatbuffers/util.h" 22 #include "flatbuffers/code_generators.h" 23 24 namespace flatbuffers { 25 26 static std::string GenType(const Type &type) { 27 switch (type.base_type) { 28 case BASE_TYPE_STRUCT: 29 return type.struct_def->defined_namespace->GetFullyQualifiedName( 30 type.struct_def->name); 31 case BASE_TYPE_UNION: 32 return type.enum_def->defined_namespace->GetFullyQualifiedName( 33 type.enum_def->name); 34 case BASE_TYPE_VECTOR: 35 return "[" + GenType(type.VectorType()) + "]"; 36 default: 37 return kTypeNames[type.base_type]; 38 } 39 } 40 41 static void GenNameSpace(const Namespace &name_space, std::string *_schema, 42 const Namespace **last_namespace) { 43 if (*last_namespace == &name_space) return; 44 *last_namespace = &name_space; 45 auto &schema = *_schema; 46 schema += "namespace "; 47 for (auto it = name_space.components.begin(); 48 it != name_space.components.end(); ++it) { 49 if (it != name_space.components.begin()) schema += "."; 50 schema += *it; 51 } 52 schema += ";\n\n"; 53 } 54 55 // Generate a flatbuffer schema from the Parser's internal representation. 56 std::string GenerateFBS(const Parser &parser, const std::string &file_name) { 57 // Proto namespaces may clash with table names, so we have to prefix all: 58 if (!parser.opts.escape_proto_identifiers) { 59 for (auto it = parser.namespaces_.begin(); it != parser.namespaces_.end(); 60 ++it) { 61 for (auto comp = (*it)->components.begin(); comp != (*it)->components.end(); 62 ++comp) { 63 (*comp) = "_" + (*comp); 64 } 65 } 66 } 67 68 std::string schema; 69 schema += "// Generated from " + file_name + ".proto\n\n"; 70 if (parser.opts.include_dependence_headers) { 71 #ifdef FBS_GEN_INCLUDES // TODO: currently all in one file. 72 int num_includes = 0; 73 for (auto it = parser.included_files_.begin(); 74 it != parser.included_files_.end(); ++it) { 75 auto basename = flatbuffers::StripPath( 76 flatbuffers::StripExtension(it->first)); 77 if (basename != file_name) { 78 schema += "include \"" + basename + ".fbs\";\n"; 79 num_includes++; 80 } 81 } 82 if (num_includes) schema += "\n"; 83 #endif 84 } 85 // Generate code for all the enum declarations. 86 const Namespace *last_namespace = nullptr; 87 for (auto enum_def_it = parser.enums_.vec.begin(); 88 enum_def_it != parser.enums_.vec.end(); ++enum_def_it) { 89 EnumDef &enum_def = **enum_def_it; 90 GenNameSpace(*enum_def.defined_namespace, &schema, &last_namespace); 91 GenComment(enum_def.doc_comment, &schema, nullptr); 92 schema += "enum " + enum_def.name + " : "; 93 schema += GenType(enum_def.underlying_type) + " {\n"; 94 for (auto it = enum_def.vals.vec.begin(); 95 it != enum_def.vals.vec.end(); ++it) { 96 auto &ev = **it; 97 GenComment(ev.doc_comment, &schema, nullptr, " "); 98 schema += " " + ev.name + " = " + NumToString(ev.value) + ",\n"; 99 } 100 schema += "}\n\n"; 101 } 102 // Generate code for all structs/tables. 103 for (auto it = parser.structs_.vec.begin(); 104 it != parser.structs_.vec.end(); ++it) { 105 StructDef &struct_def = **it; 106 GenNameSpace(*struct_def.defined_namespace, &schema, &last_namespace); 107 GenComment(struct_def.doc_comment, &schema, nullptr); 108 schema += "table " + struct_def.name + " {\n"; 109 for (auto field_it = struct_def.fields.vec.begin(); 110 field_it != struct_def.fields.vec.end(); ++field_it) { 111 auto &field = **field_it; 112 GenComment(field.doc_comment, &schema, nullptr, " "); 113 schema += " " + field.name + ":" + GenType(field.value.type); 114 if (field.value.constant != "0") schema += " = " + field.value.constant; 115 if (field.required) schema += " (required)"; 116 schema += ";\n"; 117 } 118 schema += "}\n\n"; 119 } 120 return schema; 121 } 122 123 bool GenerateFBS(const Parser &parser, 124 const std::string &path, 125 const std::string &file_name) { 126 return SaveFile((path + file_name + ".fbs").c_str(), 127 GenerateFBS(parser, file_name), false); 128 } 129 130 } // namespace flatbuffers 131 132
