2 * Copyright 2018 Dan Field
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 // independent from idl_parser, since this code is not needed for most clients
20 #include "flatbuffers/code_generators.h"
21 #include "flatbuffers/flatbuffers.h"
22 #include "flatbuffers/idl.h"
23 #include "flatbuffers/util.h"
25 namespace flatbuffers {
27 static std::string GeneratedFileName(const std::string &path,
28 const std::string &file_name) {
29 return path + file_name + "_generated.dart";
34 const std::string _kFb = "fb";
35 // see https://www.dartlang.org/guides/language/language-tour#keywords
36 // yeild*, async*, and sync* shouldn't be problems anyway but keeping them in
37 static const char *keywords[] = {
38 "abstract", "deferred", "if", "super", "as", "do",
39 "implements", "switch", "assert", "dynamic", "import", "sync*",
40 "async", "else", "in", "this", "async*", "enum",
41 "is", "throw", "await", "export", "library", "true",
42 "break", "external", "new", "try", "case", "extends",
43 "null", "typedef", "catch", "factory", "operator", "var",
44 "class", "false", "part", "void", "const", "final",
45 "rethrow", "while", "continue", "finally", "return", "with",
46 "covariant", "for", "set", "yield", "default", "get",
50 // Iterate through all definitions we haven't generate code for (enums, structs,
51 // and tables) and output them to a single file.
52 class DartGenerator : public BaseGenerator {
54 typedef std::map<std::string, std::string> namespace_code_map;
56 DartGenerator(const Parser &parser, const std::string &path,
57 const std::string &file_name)
58 : BaseGenerator(parser, path, file_name, "", ".") {}
59 // Iterate through all definitions we haven't generate code for (enums,
60 // structs, and tables) and output them to a single file.
63 namespace_code_map namespace_code;
64 GenerateEnums(&namespace_code);
65 GenerateStructs(&namespace_code);
67 for (auto kv = namespace_code.begin(); kv != namespace_code.end(); ++kv) {
69 code = code + "// " + FlatBuffersGeneratedWarning() + "\n";
71 "// ignore_for_file: unused_import, unused_field, "
72 "unused_local_variable\n\n";
74 if (!kv->first.empty()) {
75 code += "library " + kv->first + ";\n\n";
78 code += "import 'dart:typed_data' show Uint8List;\n";
79 code += "import 'package:flat_buffers/flat_buffers.dart' as " + _kFb +
82 if (parser_.opts.include_dependence_headers) {
83 GenIncludeDependencies(&code, kv->first);
86 for (auto kv2 = namespace_code.begin(); kv2 != namespace_code.end();
88 if (kv2->first != kv->first) {
90 GeneratedFileName("./", file_name_ + (!kv2->first.empty() ? "_" + kv2->first : "")) +
91 "' as " + ImportAliasName(kv2->first) + ";\n";
98 GeneratedFileName(path_, file_name_ + (!kv->first.empty() ? "_" + kv->first : "")).c_str(),
107 static std::string ImportAliasName(const std::string &ns) {
110 size_t pos = ret.find('.');
111 while (pos != std::string::npos) {
112 ret.replace(pos, 1, "_");
113 pos = ret.find('.', pos + 1);
119 static std::string BuildNamespaceName(const Namespace &ns) {
120 if (ns.components.empty()) {
123 std::stringstream sstream;
124 std::copy(ns.components.begin(), ns.components.end() - 1,
125 std::ostream_iterator<std::string>(sstream, "."));
127 auto ret = sstream.str() + ns.components.back();
128 for (size_t i = 0; i < ret.size(); i++) {
129 auto lower = tolower(ret[i]);
130 if (lower != ret[i]) {
131 ret[i] = static_cast<char>(lower);
132 if (i != 0 && ret[i - 1] != '.') {
138 // std::transform(ret.begin(), ret.end(), ret.begin(), ::tolower);
142 void GenIncludeDependencies(std::string* code, const std::string& the_namespace) {
143 for (auto it = parser_.included_files_.begin();
144 it != parser_.included_files_.end(); ++it) {
145 if (it->second.empty()) continue;
147 auto noext = flatbuffers::StripExtension(it->second);
148 auto basename = flatbuffers::StripPath(noext);
150 *code += "import '" + GeneratedFileName("", basename + (the_namespace == "" ? "" : "_" + the_namespace)) + "';\n";
154 static std::string EscapeKeyword(const std::string &name) {
155 for (size_t i = 0; i < sizeof(keywords) / sizeof(keywords[0]); i++) {
156 if (name == keywords[i]) { return MakeCamel(name + "_", false); }
159 return MakeCamel(name, false);
162 void GenerateEnums(namespace_code_map *namespace_code) {
163 for (auto it = parser_.enums_.vec.begin(); it != parser_.enums_.vec.end();
165 auto &enum_def = **it;
166 GenEnum(enum_def, namespace_code); // enum_code_ptr);
170 void GenerateStructs(namespace_code_map *namespace_code) {
171 for (auto it = parser_.structs_.vec.begin();
172 it != parser_.structs_.vec.end(); ++it) {
173 auto &struct_def = **it;
174 GenStruct(struct_def, namespace_code);
178 // Generate a documentation comment, if available.
179 static void GenDocComment(const std::vector<std::string> &dc,
180 std::string *code_ptr,
181 const std::string &extra_lines,
182 const char *indent = nullptr) {
183 if (dc.empty() && extra_lines.empty()) {
184 // Don't output empty comment blocks with 0 lines of comment content.
188 auto &code = *code_ptr;
190 for (auto it = dc.begin(); it != dc.end(); ++it) {
191 if (indent) code += indent;
192 code += "/// " + *it + "\n";
194 if (!extra_lines.empty()) {
196 if (indent) code += indent;
199 if (indent) code += indent;
200 std::string::size_type start = 0;
202 auto end = extra_lines.find('\n', start);
203 if (end != std::string::npos) {
204 code += "/// " + extra_lines.substr(start, end - start) + "\n";
207 code += "/// " + extra_lines.substr(start) + "\n";
214 static void GenDocComment(std::string *code_ptr,
215 const std::string &extra_lines) {
216 GenDocComment(std::vector<std::string>(), code_ptr, extra_lines);
219 // Generate an enum declaration and an enum string lookup table.
220 void GenEnum(EnumDef &enum_def, namespace_code_map *namespace_code) {
221 if (enum_def.generated) return;
222 auto ns = BuildNamespaceName(*enum_def.defined_namespace);
224 GenDocComment(enum_def.doc_comment, &code, "");
226 auto name = enum_def.is_union ? enum_def.name + "TypeId" : enum_def.name;
227 auto is_bit_flags = enum_def.attributes.Lookup("bit_flags");
229 code += "class " + name + " {\n";
230 code += " final int value;\n";
231 code += " const " + name + "._(this.value);\n\n";
232 code += " factory " + name + ".fromValue(int value) {\n";
233 code += " if (value == null) value = 0;\n";
235 code += " if (!values.containsKey(value)) {\n";
237 " throw new StateError('Invalid value $value for bit flag enum ";
238 code += name + "');\n";
241 code += " return values[value];\n";
244 // this is meaningless for bit_flags
245 // however, note that unlike "regular" dart enums this enum can still have
248 code += " static const int minValue = " +
249 enum_def.ToString(*enum_def.MinValue()) + ";\n";
250 code += " static const int maxValue = " +
251 enum_def.ToString(*enum_def.MaxValue()) + ";\n";
255 " static bool containsValue(int value) =>"
256 " values.containsKey(value);\n\n";
258 for (auto it = enum_def.Vals().begin(); it != enum_def.Vals().end(); ++it) {
261 if (!ev.doc_comment.empty()) {
262 if (it != enum_def.Vals().begin()) { code += '\n'; }
263 GenDocComment(ev.doc_comment, &code, "", " ");
265 code += " static const " + name + " " + ev.name + " = ";
266 code += "const " + name + "._(" + enum_def.ToString(ev) + ");\n";
269 code += " static get values => {";
270 for (auto it = enum_def.Vals().begin(); it != enum_def.Vals().end(); ++it) {
272 code += enum_def.ToString(ev) + ": " + ev.name + ",";
276 code += " static const " + _kFb + ".Reader<" + name +
277 "> reader = const _" + name + "Reader();\n\n";
278 code += " @override\n";
279 code += " String toString() {\n";
280 code += " return '" + name + "{value: $value}';\n";
284 GenEnumReader(enum_def, name, &code);
285 (*namespace_code)[ns] += code;
288 void GenEnumReader(EnumDef &enum_def, const std::string &name,
289 std::string *code_ptr) {
290 auto &code = *code_ptr;
292 code += "class _" + name + "Reader extends " + _kFb + ".Reader<" + name +
294 code += " const _" + name + "Reader();\n\n";
295 code += " @override\n";
296 code += " int get size => 1;\n\n";
297 code += " @override\n";
299 " " + name + " read(" + _kFb + ".BufferContext bc, int offset) =>\n";
300 code += " new " + name + ".fromValue(const " + _kFb + "." +
301 GenType(enum_def.underlying_type) + "Reader().read(bc, offset));\n";
305 static std::string GenType(const Type &type) {
306 switch (type.base_type) {
307 case BASE_TYPE_BOOL: return "Bool";
308 case BASE_TYPE_CHAR: return "Int8";
309 case BASE_TYPE_UTYPE:
310 case BASE_TYPE_UCHAR: return "Uint8";
311 case BASE_TYPE_SHORT: return "Int16";
312 case BASE_TYPE_USHORT: return "Uint16";
313 case BASE_TYPE_INT: return "Int32";
314 case BASE_TYPE_UINT: return "Uint32";
315 case BASE_TYPE_LONG: return "Int64";
316 case BASE_TYPE_ULONG: return "Uint64";
317 case BASE_TYPE_FLOAT: return "Float32";
318 case BASE_TYPE_DOUBLE: return "Float64";
319 case BASE_TYPE_STRING: return "String";
320 case BASE_TYPE_VECTOR: return GenType(type.VectorType());
321 case BASE_TYPE_STRUCT: return type.struct_def->name;
322 case BASE_TYPE_UNION: return type.enum_def->name + "TypeId";
323 default: return "Table";
327 std::string GenReaderTypeName(const Type &type, Namespace *current_namespace,
329 bool parent_is_vector = false) {
330 if (type.base_type == BASE_TYPE_BOOL) {
331 return "const " + _kFb + ".BoolReader()";
332 } else if (type.base_type == BASE_TYPE_VECTOR) {
333 return "const " + _kFb + ".ListReader<" +
334 GenDartTypeName(type.VectorType(), current_namespace, def) + ">(" +
335 GenReaderTypeName(type.VectorType(), current_namespace, def,
338 } else if (type.base_type == BASE_TYPE_STRING) {
339 return "const " + _kFb + ".StringReader()";
341 if (IsScalar(type.base_type)) {
342 if (type.enum_def && parent_is_vector) {
343 return GenDartTypeName(type, current_namespace, def) + ".reader";
345 return "const " + _kFb + "." + GenType(type) + "Reader()";
347 return GenDartTypeName(type, current_namespace, def) + ".reader";
351 std::string GenDartTypeName(const Type &type, Namespace *current_namespace,
352 const FieldDef &def, bool addBuilder = false) {
354 if (type.enum_def->is_union && type.base_type != BASE_TYPE_UNION) {
355 return type.enum_def->name + "TypeId";
356 } else if (type.enum_def->is_union) {
358 } else if (type.base_type != BASE_TYPE_VECTOR) {
359 return type.enum_def->name;
363 switch (type.base_type) {
364 case BASE_TYPE_BOOL: return "bool";
366 case BASE_TYPE_ULONG:
369 case BASE_TYPE_SHORT:
370 case BASE_TYPE_USHORT:
372 case BASE_TYPE_UCHAR: return "int";
373 case BASE_TYPE_FLOAT:
374 case BASE_TYPE_DOUBLE: return "double";
375 case BASE_TYPE_STRING: return "String";
376 case BASE_TYPE_STRUCT:
377 return MaybeWrapNamespace(
378 type.struct_def->name + (addBuilder ? "ObjectBuilder" : ""),
379 current_namespace, def);
380 case BASE_TYPE_VECTOR:
382 GenDartTypeName(type.VectorType(), current_namespace, def,
385 default: assert(0); return "dynamic";
389 static const std::string MaybeWrapNamespace(const std::string &type_name,
390 Namespace *current_ns,
391 const FieldDef &field) {
392 auto curr_ns_str = BuildNamespaceName(*current_ns);
393 std::string field_ns_str = "";
394 if (field.value.type.struct_def) {
396 BuildNamespaceName(*field.value.type.struct_def->defined_namespace);
397 } else if (field.value.type.enum_def) {
399 BuildNamespaceName(*field.value.type.enum_def->defined_namespace);
402 if (field_ns_str != "" && field_ns_str != curr_ns_str) {
403 return ImportAliasName(field_ns_str) + "." + type_name;
409 // Generate an accessor struct with constructor for a flatbuffers struct.
410 void GenStruct(const StructDef &struct_def,
411 namespace_code_map *namespace_code) {
412 if (struct_def.generated) return;
414 auto object_namespace = BuildNamespaceName(*struct_def.defined_namespace);
417 const auto &object_name = struct_def.name;
421 GenDocComment(struct_def.doc_comment, &code, "");
423 auto reader_name = "_" + object_name + "Reader";
424 auto builder_name = object_name + "Builder";
425 auto object_builder_name = object_name + "ObjectBuilder";
427 std::string reader_code, builder_code;
429 code += "class " + object_name + " {\n";
431 code += " " + object_name + "._(this._bc, this._bcOffset);\n";
432 if (!struct_def.fixed) {
433 code += " factory " + object_name + "(List<int> bytes) {\n";
434 code += " " + _kFb + ".BufferContext rootRef = new " + _kFb +
435 ".BufferContext.fromBytes(bytes);\n";
436 code += " return reader.read(rootRef, 0);\n";
441 code += " static const " + _kFb + ".Reader<" + object_name +
442 "> reader = const " + reader_name + "();\n\n";
444 code += " final " + _kFb + ".BufferContext _bc;\n";
445 code += " final int _bcOffset;\n\n";
447 GenImplementationGetters(struct_def, &code);
451 GenReader(struct_def, &reader_name, &reader_code);
452 GenBuilder(struct_def, &builder_name, &builder_code);
453 GenObjectBuilder(struct_def, &object_builder_name, &builder_code);
456 code += builder_code;
458 (*namespace_code)[object_namespace] += code;
461 std::string NamespaceAliasFromUnionType(const std::string &in) {
462 if (in.find('_') == std::string::npos) { return in; }
464 std::stringstream ss(in);
466 std::vector<std::string> parts;
469 while (std::getline(ss, item, '_')) { parts.push_back(item); }
471 for (auto it = parts.begin(); it != parts.end() - 1; ++it) {
474 for (size_t i = 0; i < part.length(); i++) {
475 if (i && !isdigit(part[i]) &&
476 part[i] == static_cast<char>(toupper(part[i]))) {
478 ns += static_cast<char>(tolower(part[i]));
480 ns += static_cast<char>(tolower(part[i]));
483 if (it != parts.end() - 2) { ns += "_"; }
486 return ns + "." + parts.back();
489 void GenImplementationGetters(const StructDef &struct_def,
490 std::string *code_ptr) {
491 auto &code = *code_ptr;
493 for (auto it = struct_def.fields.vec.begin();
494 it != struct_def.fields.vec.end(); ++it) {
496 if (field.deprecated) continue;
498 std::string field_name = MakeCamel(field.name, false);
499 std::string type_name = GenDartTypeName(
500 field.value.type, struct_def.defined_namespace, field, false);
502 GenDocComment(field.doc_comment, &code, "", " ");
504 code += " " + type_name + " get " + field_name;
505 if (field.value.type.base_type == BASE_TYPE_UNION) {
507 code += " switch (" + field_name + "Type?.value) {\n";
508 auto &enum_def = *field.value.type.enum_def;
509 for (auto en_it = enum_def.Vals().begin() + 1;
510 en_it != enum_def.Vals().end(); ++en_it) {
513 auto enum_name = NamespaceAliasFromUnionType(ev.name);
514 code += " case " + enum_def.ToString(ev) + ": return " +
515 enum_name + ".reader.vTableGet(_bc, _bcOffset, " +
516 NumToString(field.value.offset) + ", null);\n";
518 code += " default: return null;\n";
523 if (field.value.type.enum_def &&
524 field.value.type.base_type != BASE_TYPE_VECTOR) {
526 GenDartTypeName(field.value.type,
527 struct_def.defined_namespace, field) +
531 code += GenReaderTypeName(field.value.type,
532 struct_def.defined_namespace, field);
533 if (struct_def.fixed) {
535 ".read(_bc, _bcOffset + " + NumToString(field.value.offset) + ")";
537 code += ".vTableGet(_bc, _bcOffset, " +
538 NumToString(field.value.offset) + ", ";
539 if (!field.value.constant.empty() && field.value.constant != "0") {
540 if (IsBool(field.value.type.base_type)) {
543 code += field.value.constant;
546 if (IsBool(field.value.type.base_type)) {
548 } else if (IsScalar(field.value.type.base_type)) {
556 if (field.value.type.enum_def &&
557 field.value.type.base_type != BASE_TYPE_VECTOR) {
566 code += " @override\n";
567 code += " String toString() {\n";
568 code += " return '" + struct_def.name + "{";
569 for (auto it = struct_def.fields.vec.begin();
570 it != struct_def.fields.vec.end(); ++it) {
572 if (field.deprecated) continue;
574 MakeCamel(field.name, false) + ": $" + MakeCamel(field.name, false);
575 if (it != struct_def.fields.vec.end() - 1) { code += ", "; }
581 void GenReader(const StructDef &struct_def, std::string *reader_name_ptr,
582 std::string *code_ptr) {
583 auto &code = *code_ptr;
584 auto &reader_name = *reader_name_ptr;
585 auto &impl_name = struct_def.name;
587 code += "class " + reader_name + " extends " + _kFb;
588 if (struct_def.fixed) {
589 code += ".StructReader<";
591 code += ".TableReader<";
593 code += impl_name + "> {\n";
594 code += " const " + reader_name + "();\n\n";
596 if (struct_def.fixed) {
597 code += " @override\n";
598 code += " int get size => " + NumToString(struct_def.bytesize) + ";\n\n";
600 code += " @override\n";
601 code += " " + impl_name +
602 " createObject(fb.BufferContext bc, int offset) => \n new " +
603 impl_name + "._(bc, offset);\n";
607 void GenBuilder(const StructDef &struct_def, std::string *builder_name_ptr,
608 std::string *code_ptr) {
609 if (struct_def.fields.vec.size() == 0) { return; }
610 auto &code = *code_ptr;
611 auto &builder_name = *builder_name_ptr;
613 code += "class " + builder_name + " {\n";
614 code += " " + builder_name + "(this.fbBuilder) {\n";
615 code += " assert(fbBuilder != null);\n";
617 code += " final " + _kFb + ".Builder fbBuilder;\n\n";
619 if (struct_def.fixed) {
620 StructBuilderBody(struct_def, code_ptr);
622 TableBuilderBody(struct_def, code_ptr);
628 void StructBuilderBody(const StructDef &struct_def, std::string *code_ptr) {
629 auto &code = *code_ptr;
631 code += " int finish(";
632 for (auto it = struct_def.fields.vec.begin();
633 it != struct_def.fields.vec.end(); ++it) {
635 if (field.deprecated) continue;
637 if (IsStruct(field.value.type)) {
638 code += "fb.StructBuilder";
640 code += GenDartTypeName(field.value.type, struct_def.defined_namespace,
643 code += " " + field.name;
644 if (it != struct_def.fields.vec.end() - 1) { code += ", "; }
648 for (auto it = struct_def.fields.vec.rbegin();
649 it != struct_def.fields.vec.rend(); ++it) {
652 if (field.deprecated) continue;
655 code += " fbBuilder.pad(" + NumToString(field.padding) + ");\n";
658 if (IsStruct(field.value.type)) {
659 code += " " + field.name + "();\n";
661 code += " fbBuilder.put" + GenType(field.value.type) + "(";
663 if (field.value.type.enum_def) { code += "?.value"; }
667 code += " return fbBuilder.offset;\n";
671 void TableBuilderBody(const StructDef &struct_def, std::string *code_ptr) {
672 auto &code = *code_ptr;
674 code += " void begin() {\n";
675 code += " fbBuilder.startTable();\n";
678 for (auto it = struct_def.fields.vec.begin();
679 it != struct_def.fields.vec.end(); ++it) {
681 if (field.deprecated) continue;
683 auto offset = it - struct_def.fields.vec.begin();
685 if (IsScalar(field.value.type.base_type)) {
686 code += " int add" + MakeCamel(field.name) + "(";
687 code += GenDartTypeName(field.value.type, struct_def.defined_namespace,
689 code += " " + MakeCamel(field.name, false) + ") {\n";
690 code += " fbBuilder.add" + GenType(field.value.type) + "(" +
691 NumToString(offset) + ", ";
692 code += MakeCamel(field.name, false);
693 if (field.value.type.enum_def) { code += "?.value"; }
695 } else if (IsStruct(field.value.type)) {
696 code += " int add" + MakeCamel(field.name) + "(int offset) {\n";
698 " fbBuilder.addStruct(" + NumToString(offset) + ", offset);\n";
700 code += " int add" + MakeCamel(field.name) + "Offset(int offset) {\n";
702 " fbBuilder.addOffset(" + NumToString(offset) + ", offset);\n";
704 code += " return fbBuilder.offset;\n";
709 code += " int finish() {\n";
710 code += " return fbBuilder.endTable();\n";
714 void GenObjectBuilder(const StructDef &struct_def,
715 std::string *builder_name_ptr, std::string *code_ptr) {
716 auto &code = *code_ptr;
717 auto &builder_name = *builder_name_ptr;
719 code += "class " + builder_name + " extends " + _kFb + ".ObjectBuilder {\n";
720 for (auto it = struct_def.fields.vec.begin();
721 it != struct_def.fields.vec.end(); ++it) {
723 if (field.deprecated) continue;
725 GenDartTypeName(field.value.type, struct_def.defined_namespace,
727 " _" + MakeCamel(field.name, false) + ";\n";
730 code += " " + builder_name + "(";
731 if (struct_def.fields.vec.size() != 0) {
735 for (auto it = struct_def.fields.vec.begin();
736 it != struct_def.fields.vec.end(); ++it) {
738 if (field.deprecated) continue;
740 GenDartTypeName(field.value.type, struct_def.defined_namespace,
742 " " + MakeCamel(field.name, false) + ",\n";
746 for (auto it = struct_def.fields.vec.begin();
747 it != struct_def.fields.vec.end(); ++it) {
749 if (field.deprecated) continue;
750 code += "_" + MakeCamel(field.name, false) + " = " +
751 MakeCamel(field.name, false);
752 if (it == struct_def.fields.vec.end() - 1) {
762 code += " /// Finish building, and store into the [fbBuilder].\n";
763 code += " @override\n";
764 code += " int finish(\n";
765 code += " " + _kFb + ".Builder fbBuilder) {\n";
766 code += " assert(fbBuilder != null);\n";
768 for (auto it = struct_def.fields.vec.begin();
769 it != struct_def.fields.vec.end(); ++it) {
771 if (field.deprecated) continue;
772 if (IsScalar(field.value.type.base_type) || IsStruct(field.value.type))
775 code += " final int " + MakeCamel(field.name, false) + "Offset";
776 if (field.value.type.base_type == BASE_TYPE_VECTOR) {
778 " = _" + MakeCamel(field.name, false) + "?.isNotEmpty == true\n";
779 code += " ? fbBuilder.writeList";
780 switch (field.value.type.VectorType().base_type) {
781 case BASE_TYPE_STRING:
782 code += "(_" + MakeCamel(field.name, false) +
783 ".map((b) => fbBuilder.writeString(b)).toList())";
785 case BASE_TYPE_STRUCT:
786 if (field.value.type.struct_def->fixed) {
787 code += "OfStructs(_" + MakeCamel(field.name, false) + ")";
789 code += "(_" + MakeCamel(field.name, false) +
790 ".map((b) => b.getOrCreateOffset(fbBuilder)).toList())";
794 code += GenType(field.value.type.VectorType()) + "(_" +
795 MakeCamel(field.name, false);
796 if (field.value.type.enum_def) { code += ".map((f) => f.value)"; }
799 code += "\n : null;\n";
800 } else if (field.value.type.base_type == BASE_TYPE_STRING) {
801 code += " = fbBuilder.writeString(_" + MakeCamel(field.name, false) + ");\n";
803 code += " = _" + MakeCamel(field.name, false) +
804 "?.getOrCreateOffset(fbBuilder);\n";
809 if (struct_def.fixed) {
810 StructObjectBuilderBody(struct_def, code_ptr);
812 TableObjectBuilderBody(struct_def, code_ptr);
816 code += " /// Convenience method to serialize to byte list.\n";
817 code += " @override\n";
818 code += " Uint8List toBytes([String fileIdentifier]) {\n";
819 code += " " + _kFb + ".Builder fbBuilder = new ";
820 code += _kFb + ".Builder();\n";
821 code += " int offset = finish(fbBuilder);\n";
822 code += " return fbBuilder.finish(offset, fileIdentifier);\n";
827 void StructObjectBuilderBody(const StructDef &struct_def,
828 std::string *code_ptr,
829 bool prependUnderscore = true) {
830 auto &code = *code_ptr;
832 for (auto it = struct_def.fields.vec.rbegin();
833 it != struct_def.fields.vec.rend(); ++it) {
836 if (field.deprecated) continue;
839 code += " fbBuilder.pad(" + NumToString(field.padding) + ");\n";
842 if (IsStruct(field.value.type)) {
844 if (prependUnderscore) { code += "_"; }
845 code += field.name + ".finish(fbBuilder);\n";
847 code += " fbBuilder.put" + GenType(field.value.type) + "(";
848 if (prependUnderscore) { code += "_"; }
850 if (field.value.type.enum_def) { code += "?.value"; }
855 code += " return fbBuilder.offset;\n";
858 void TableObjectBuilderBody(const StructDef &struct_def,
859 std::string *code_ptr,
860 bool prependUnderscore = true) {
861 std::string &code = *code_ptr;
862 code += " fbBuilder.startTable();\n";
864 for (auto it = struct_def.fields.vec.begin();
865 it != struct_def.fields.vec.end(); ++it) {
868 if (field.deprecated) continue;
870 auto offset = it - struct_def.fields.vec.begin();
871 if (IsScalar(field.value.type.base_type)) {
872 code += " fbBuilder.add" + GenType(field.value.type) + "(" +
873 NumToString(offset) + ", ";
874 if (prependUnderscore) { code += "_"; }
875 code += MakeCamel(field.name, false);
876 if (field.value.type.enum_def) { code += "?.value"; }
878 } else if (IsStruct(field.value.type)) {
880 if (prependUnderscore) { code += "_"; }
881 code += MakeCamel(field.name, false) + " != null) {\n";
882 code += " fbBuilder.addStruct(" + NumToString(offset) + ", ";
883 code += "_" + MakeCamel(field.name, false) + ".finish(fbBuilder));\n";
887 " if (" + MakeCamel(field.name, false) + "Offset != null) {\n";
888 code += " fbBuilder.addOffset(" + NumToString(offset) + ", " +
889 MakeCamel(field.name, false) + "Offset);\n";
893 code += " return fbBuilder.endTable();\n";
898 bool GenerateDart(const Parser &parser, const std::string &path,
899 const std::string &file_name) {
900 dart::DartGenerator generator(parser, path, file_name);
901 return generator.generate();
904 std::string DartMakeRule(const Parser &parser, const std::string &path,
905 const std::string &file_name) {
906 assert(parser.opts.lang <= IDLOptions::kMAX);
909 flatbuffers::StripPath(flatbuffers::StripExtension(file_name));
910 auto make_rule = GeneratedFileName(path, filebase) + ": ";
912 auto included_files = parser.GetIncludedFilesRecursive(file_name);
913 for (auto it = included_files.begin(); it != included_files.end(); ++it) {
914 make_rule += " " + *it;
919 } // namespace flatbuffers