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idl_gen_ts.cpp
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idl_gen_ts.cpp
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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.
*/
#include <algorithm>
#include <cassert>
#include <unordered_map>
#include <unordered_set>
#include "flatbuffers/code_generators.h"
#include "flatbuffers/flatbuffers.h"
#include "flatbuffers/idl.h"
#include "flatbuffers/util.h"
#include "idl_namer.h"
namespace flatbuffers {
namespace {
struct ImportDefinition {
std::string name;
std::string import_statement;
std::string export_statement;
std::string bare_file_path;
std::string rel_file_path;
std::string object_name;
const Definition *dependent = nullptr;
const Definition *dependency = nullptr;
};
Namer::Config TypeScriptDefaultConfig() {
return { /*types=*/Case::kKeep,
/*constants=*/Case::kUnknown,
/*methods=*/Case::kLowerCamel,
/*functions=*/Case::kLowerCamel,
/*fields=*/Case::kLowerCamel,
/*variables=*/Case::kLowerCamel,
/*variants=*/Case::kKeep,
/*enum_variant_seperator=*/"::",
/*escape_keywords=*/Namer::Config::Escape::AfterConvertingCase,
/*namespaces=*/Case::kKeep,
/*namespace_seperator=*/"_",
/*object_prefix=*/"",
/*object_suffix=*/"T",
/*keyword_prefix=*/"",
/*keyword_suffix=*/"_",
/*filenames=*/Case::kDasher,
/*directories=*/Case::kDasher,
/*output_path=*/"",
/*filename_suffix=*/"_generated",
/*filename_extension=*/".ts" };
}
std::set<std::string> TypescriptKeywords() {
// List of keywords retrieved from here:
// https://github.com/microsoft/TypeScript/issues/2536
return {
"arguments", "break", "case", "catch", "class", "const",
"continue", "debugger", "default", "delete", "do", "else",
"enum", "export", "extends", "false", "finally", "for",
"function", "if", "import", "in", "instanceof", "new",
"null", "Object", "return", "super", "switch", "this",
"throw", "true", "try", "typeof", "var", "void",
"while", "with", "as", "implements", "interface", "let",
"package", "private", "protected", "public", "static", "yield",
};
}
enum AnnotationType { kParam = 0, kType = 1, kReturns = 2 };
template<typename T> struct SupportsObjectAPI : std::false_type {};
template<> struct SupportsObjectAPI<StructDef> : std::true_type {};
} // namespace
namespace ts {
// Iterate through all definitions we haven't generate code for (enums, structs,
// and tables) and output them to a single file.
class TsGenerator : public BaseGenerator {
public:
typedef std::map<std::string, ImportDefinition> import_set;
TsGenerator(const Parser &parser, const std::string &path,
const std::string &file_name)
: BaseGenerator(parser, path, file_name, "", "_", "ts"),
namer_(WithFlagOptions(TypeScriptDefaultConfig(), parser.opts, path),
TypescriptKeywords()) {}
bool generate() {
generateEnums();
generateStructs();
generateEntry();
return true;
}
bool IncludeNamespace() const {
// When generating a single flat file and all its includes, namespaces are
// important to avoid type name clashes.
return parser_.opts.ts_flat_file && parser_.opts.generate_all;
}
std::string GetTypeName(const EnumDef &def, const bool = false,
const bool force_ns_wrap = false) {
if (IncludeNamespace() || force_ns_wrap) {
return namer_.NamespacedType(def);
}
return namer_.Type(def);
}
std::string GetTypeName(const StructDef &def, const bool object_api = false,
const bool force_ns_wrap = false) {
if (object_api && parser_.opts.generate_object_based_api) {
if (IncludeNamespace() || force_ns_wrap) {
return namer_.NamespacedObjectType(def);
} else {
return namer_.ObjectType(def);
}
} else {
if (IncludeNamespace() || force_ns_wrap) {
return namer_.NamespacedType(def);
} else {
return namer_.Type(def);
}
}
}
// Save out the generated code for a single class while adding
// declaration boilerplate.
bool SaveType(const Definition &definition, const std::string &class_code,
import_set &imports, import_set &bare_imports) {
if (!class_code.length()) return true;
std::string code;
if (!parser_.opts.ts_flat_file) {
code += "// " + std::string(FlatBuffersGeneratedWarning()) + "\n\n";
for (auto it = bare_imports.begin(); it != bare_imports.end(); it++) {
code += it->second.import_statement + "\n";
}
if (!bare_imports.empty()) code += "\n";
for (auto it = imports.begin(); it != imports.end(); it++) {
if (it->second.dependency != &definition) {
code += it->second.import_statement + "\n";
}
}
if (!imports.empty()) code += "\n\n";
}
code += class_code;
if (parser_.opts.ts_flat_file) {
flat_file_ += code;
flat_file_ += "\n";
flat_file_definitions_.insert(&definition);
return true;
} else {
auto dirs = namer_.Directories(*definition.defined_namespace);
EnsureDirExists(dirs);
auto basename = dirs + namer_.File(definition, SkipFile::Suffix);
return SaveFile(basename.c_str(), code, false);
}
}
private:
IdlNamer namer_;
import_set imports_all_;
// The following three members are used when generating typescript code into a
// single file rather than creating separate files for each type.
// flat_file_ contains the aggregated contents of the file prior to being
// written to disk.
std::string flat_file_;
// flat_file_definitions_ tracks which types have been written to flat_file_.
std::unordered_set<const Definition *> flat_file_definitions_;
// This maps from import names to types to import.
std::map<std::string, std::map<std::string, std::string>>
flat_file_import_declarations_;
// For flat file codegen, tracks whether we need to import the flatbuffers
// library itself (not necessary for files that solely consist of enum
// definitions).
bool import_flatbuffers_lib_ = false;
// Generate code for all enums.
void generateEnums() {
for (auto it = parser_.enums_.vec.begin(); it != parser_.enums_.vec.end();
++it) {
import_set bare_imports;
import_set imports;
std::string enumcode;
auto &enum_def = **it;
GenEnum(enum_def, &enumcode, imports, false);
GenEnum(enum_def, &enumcode, imports, true);
SaveType(enum_def, enumcode, imports, bare_imports);
imports_all_.insert(imports.begin(), imports.end());
}
}
// Generate code for all structs.
void generateStructs() {
for (auto it = parser_.structs_.vec.begin();
it != parser_.structs_.vec.end(); ++it) {
import_set bare_imports;
import_set imports;
AddImport(bare_imports, "* as flatbuffers", "flatbuffers");
import_flatbuffers_lib_ = true;
auto &struct_def = **it;
std::string declcode;
GenStruct(parser_, struct_def, &declcode, imports);
SaveType(struct_def, declcode, imports, bare_imports);
imports_all_.insert(imports.begin(), imports.end());
}
}
// Generate code for a single entry point module.
void generateEntry() {
std::string code =
"// " + std::string(FlatBuffersGeneratedWarning()) + "\n\n";
if (parser_.opts.ts_flat_file) {
if (import_flatbuffers_lib_) {
code += "import * as flatbuffers from 'flatbuffers';\n";
code += "\n";
}
// Only include import statements when not generating all.
if (!parser_.opts.generate_all) {
for (const auto &it : flat_file_import_declarations_) {
// Note that we do end up generating an import for ourselves, which
// should generally be harmless.
// TODO: Make it so we don't generate a self-import; this will also
// require modifying AddImport to ensure that we don't use
// namespace-prefixed names anywhere...
std::string file = it.first;
if (file.empty()) { continue; }
std::string noext = flatbuffers::StripExtension(file);
std::string basename = flatbuffers::StripPath(noext);
std::string include_file = GeneratedFileName(
parser_.opts.include_prefix,
parser_.opts.keep_prefix ? noext : basename, parser_.opts);
// TODO: what is the right behavior when different include flags are
// specified here? Should we always be adding the "./" for a relative
// path or turn it off if --include-prefix is specified, or something
// else?
std::string include_name =
"./" + flatbuffers::StripExtension(include_file);
code += "import {";
for (const auto &pair : it.second) {
code += namer_.EscapeKeyword(pair.first) + " as " +
namer_.EscapeKeyword(pair.second) + ", ";
}
code.resize(code.size() - 2);
code += "} from '" + include_name + ".js';\n";
}
code += "\n";
}
code += flat_file_;
const std::string filename =
GeneratedFileName(path_, file_name_, parser_.opts);
SaveFile(filename.c_str(), code, false);
} else {
for (auto it = imports_all_.begin(); it != imports_all_.end(); it++) {
code += it->second.export_statement + "\n";
}
const std::string path =
GeneratedFileName(path_, file_name_, parser_.opts);
SaveFile(path.c_str(), code, false);
}
}
// Generate a documentation comment, if available.
static void GenDocComment(const std::vector<std::string> &dc,
std::string *code_ptr,
const char *indent = nullptr) {
if (dc.empty()) {
// Don't output empty comment blocks with 0 lines of comment content.
return;
}
std::string &code = *code_ptr;
if (indent) code += indent;
code += "/**\n";
for (auto it = dc.begin(); it != dc.end(); ++it) {
if (indent) code += indent;
code += " *" + *it + "\n";
}
if (indent) code += indent;
code += " */\n";
}
static void GenDocComment(std::string *code_ptr) {
GenDocComment(std::vector<std::string>(), code_ptr);
}
// Generate an enum declaration and an enum string lookup table.
void GenEnum(EnumDef &enum_def, std::string *code_ptr, import_set &imports,
bool reverse) {
if (enum_def.generated) return;
if (reverse) return; // FIXME.
std::string &code = *code_ptr;
GenDocComment(enum_def.doc_comment, code_ptr);
code += "export enum ";
code += GetTypeName(enum_def);
code += " {\n";
for (auto it = enum_def.Vals().begin(); it != enum_def.Vals().end(); ++it) {
auto &ev = **it;
if (!ev.doc_comment.empty()) {
if (it != enum_def.Vals().begin()) { code += '\n'; }
GenDocComment(ev.doc_comment, code_ptr, " ");
}
// Generate mapping between EnumName: EnumValue(int)
if (reverse) {
code += " '" + enum_def.ToString(ev) + "'";
code += " = ";
code += "'" + namer_.Variant(ev) + "'";
} else {
code += " " + namer_.Variant(ev);
code += " = ";
// Unfortunately, because typescript does not support bigint enums,
// for 64-bit enums, we instead map the enum names to strings.
switch (enum_def.underlying_type.base_type) {
case BASE_TYPE_LONG:
case BASE_TYPE_ULONG: {
code += "'" + enum_def.ToString(ev) + "'";
break;
}
default: code += enum_def.ToString(ev);
}
}
code += (it + 1) != enum_def.Vals().end() ? ",\n" : "\n";
}
code += "}";
if (enum_def.is_union) {
code += GenUnionConvFunc(enum_def.underlying_type, imports);
}
code += "\n";
}
static std::string GenType(const Type &type) {
switch (type.base_type) {
case BASE_TYPE_BOOL:
case BASE_TYPE_CHAR: return "Int8";
case BASE_TYPE_UTYPE:
case BASE_TYPE_UCHAR: return "Uint8";
case BASE_TYPE_SHORT: return "Int16";
case BASE_TYPE_USHORT: return "Uint16";
case BASE_TYPE_INT: return "Int32";
case BASE_TYPE_UINT: return "Uint32";
case BASE_TYPE_LONG: return "Int64";
case BASE_TYPE_ULONG: return "Uint64";
case BASE_TYPE_FLOAT: return "Float32";
case BASE_TYPE_DOUBLE: return "Float64";
case BASE_TYPE_STRING: return "String";
case BASE_TYPE_VECTOR: return GenType(type.VectorType());
case BASE_TYPE_STRUCT: return type.struct_def->name;
default: return "flatbuffers.Table";
}
}
std::string GenGetter(const Type &type, const std::string &arguments) {
switch (type.base_type) {
case BASE_TYPE_STRING: return GenBBAccess() + ".__string" + arguments;
case BASE_TYPE_STRUCT: return GenBBAccess() + ".__struct" + arguments;
case BASE_TYPE_UNION:
if (!UnionHasStringType(*type.enum_def)) {
return GenBBAccess() + ".__union" + arguments;
}
return GenBBAccess() + ".__union_with_string" + arguments;
case BASE_TYPE_VECTOR: return GenGetter(type.VectorType(), arguments);
default: {
auto getter = GenBBAccess() + "." +
namer_.Method("read_" + GenType(type)) + arguments;
if (type.base_type == BASE_TYPE_BOOL) { getter = "!!" + getter; }
return getter;
}
}
}
std::string GenBBAccess() const { return "this.bb!"; }
std::string GenDefaultValue(const FieldDef &field, import_set &imports) {
if (field.IsScalarOptional()) { return "null"; }
const auto &value = field.value;
if (value.type.enum_def && value.type.base_type != BASE_TYPE_UNION &&
value.type.base_type != BASE_TYPE_VECTOR) {
// If the value is an enum with a 64-bit base type, we have to just
// return the bigint value directly since typescript does not support
// enums with bigint backing types.
switch (value.type.base_type) {
case BASE_TYPE_ARRAY: {
std::string ret = "[";
for (auto i = 0; i < value.type.fixed_length; ++i) {
ret +=
AddImport(imports, *value.type.enum_def, *value.type.enum_def)
.name +
"." +
namer_.Variant(
*value.type.enum_def->FindByValue(value.constant));
if (i < value.type.fixed_length - 1) { ret += ", "; }
}
ret += "]";
return ret;
break;
}
case BASE_TYPE_LONG:
case BASE_TYPE_ULONG: {
return "BigInt('" + value.constant + "')";
}
default: {
if (auto val = value.type.enum_def->FindByValue(value.constant)) {
return AddImport(imports, *value.type.enum_def,
*value.type.enum_def)
.name +
"." + namer_.Variant(*val);
} else {
return value.constant;
}
}
}
}
switch (value.type.base_type) {
case BASE_TYPE_BOOL: return value.constant == "0" ? "false" : "true";
case BASE_TYPE_STRING:
case BASE_TYPE_UNION:
case BASE_TYPE_STRUCT: {
return "null";
}
case BASE_TYPE_ARRAY:
case BASE_TYPE_VECTOR: return "[]";
case BASE_TYPE_LONG:
case BASE_TYPE_ULONG: {
return "BigInt('" + value.constant + "')";
}
default:
if (value.constant == "nan") { return "NaN"; }
return value.constant;
}
}
std::string GenTypeName(import_set &imports, const Definition &owner,
const Type &type, bool input,
bool allowNull = false) {
if (!input) {
if (IsString(type) || type.base_type == BASE_TYPE_STRUCT) {
std::string name;
if (IsString(type)) {
name = "string|Uint8Array";
} else {
name = AddImport(imports, owner, *type.struct_def).name;
}
return allowNull ? (name + "|null") : name;
}
}
switch (type.base_type) {
case BASE_TYPE_BOOL: return allowNull ? "boolean|null" : "boolean";
case BASE_TYPE_LONG:
case BASE_TYPE_ULONG: return allowNull ? "bigint|null" : "bigint";
case BASE_TYPE_ARRAY: {
if (type.element == BASE_TYPE_LONG || type.element == BASE_TYPE_ULONG) {
return allowNull ? "bigint[]|null" : "bigint[]";
}
if (type.element != BASE_TYPE_STRUCT) {
return allowNull ? "number[]|null" : "number[]";
}
std::string name = "any";
if (parser_.opts.generate_object_based_api) {
name += "|" + GetTypeName(*type.struct_def, /*object_api =*/true);
}
return allowNull ? " (" + name + ")[] | null" : name;
}
default:
if (IsScalar(type.base_type)) {
if (type.enum_def) {
const auto enum_name =
AddImport(imports, owner, *type.enum_def).name;
return allowNull ? (enum_name + "|null") : enum_name;
}
return allowNull ? "number|null" : "number";
}
return "flatbuffers.Offset";
}
}
// Returns the method name for use with add/put calls.
std::string GenWriteMethod(const Type &type) {
// Forward to signed versions since unsigned versions don't exist
switch (type.base_type) {
case BASE_TYPE_UTYPE:
case BASE_TYPE_UCHAR: return GenWriteMethod(Type(BASE_TYPE_CHAR));
case BASE_TYPE_USHORT: return GenWriteMethod(Type(BASE_TYPE_SHORT));
case BASE_TYPE_UINT: return GenWriteMethod(Type(BASE_TYPE_INT));
case BASE_TYPE_ULONG: return GenWriteMethod(Type(BASE_TYPE_LONG));
default: break;
}
return IsScalar(type.base_type) ? namer_.Type(GenType(type))
: (IsStruct(type) ? "Struct" : "Offset");
}
template<typename T> static std::string MaybeAdd(T value) {
return value != 0 ? " + " + NumToString(value) : "";
}
template<typename T> static std::string MaybeScale(T value) {
return value != 1 ? " * " + NumToString(value) : "";
}
void GenStructArgs(import_set &imports, const StructDef &struct_def,
std::string *arguments, const std::string &nameprefix) {
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(imports, *field.value.type.struct_def, arguments,
nameprefix + field.name + "_");
} else {
*arguments += ", " + nameprefix + field.name + ": " +
GenTypeName(imports, field, field.value.type, true,
field.IsOptional());
}
}
}
void GenStructBody(const StructDef &struct_def, std::string *body,
const std::string &nameprefix) {
*body += " builder.prep(";
*body += NumToString(struct_def.minalign) + ", ";
*body += 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) {
*body += " builder.pad(" + NumToString(field.padding) + ");\n";
}
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.
GenStructBody(*field.value.type.struct_def, body,
nameprefix.length() ? nameprefix + "_" + field.name : field.name);
} else {
auto element_type = field.value.type.element;
if (field.value.type.base_type == BASE_TYPE_ARRAY) {
switch (field.value.type.element) {
case BASE_TYPE_STRUCT: {
std::string str_last_item_idx =
NumToString(field.value.type.fixed_length - 1);
*body += "\n for (let i = " + str_last_item_idx + "; i >= 0; --i" + ") {\n";
std::string fname = nameprefix.length() ? nameprefix + "_" + field.name : field.name;
*body += " const item = " + fname + "?.[i];\n\n";
if (parser_.opts.generate_object_based_api) {
*body += " if (item instanceof " + GetTypeName(*field.value.type.struct_def, /*object_api =*/true) + ") {\n";
*body += " item.pack(builder);\n";
*body += " continue;\n";
*body += " }\n\n";
}
std::string class_name = GetPrefixedName(*field.value.type.struct_def);
std::string pack_func_create_call =
class_name + ".create" + class_name + "(builder,\n";
pack_func_create_call +=
" " + GenStructMemberValueTS(*field.value.type.struct_def,
"item", ",\n ", false) +
"\n ";
*body += " " + pack_func_create_call;
*body += " );\n }\n\n";
break;
}
default: {
std::string str_last_item_idx =
NumToString(field.value.type.fixed_length - 1);
std::string fname = nameprefix.length() ? nameprefix + "_" + field.name : field.name;
*body += "\n for (let i = " + str_last_item_idx + "; i >= 0; --i) {\n";
*body += " builder.write";
*body +=
GenWriteMethod((flatbuffers::Type)field.value.type.element);
*body += "(";
*body += element_type == BASE_TYPE_BOOL ? "+" : "";
if (element_type == BASE_TYPE_LONG ||
element_type == BASE_TYPE_ULONG) {
*body += "BigInt(" + fname + "?.[i] ?? 0));\n";
} else {
*body += "(" + fname + "?.[i] ?? 0));\n\n";
}
*body += " }\n\n";
break;
}
}
} else {
std::string fname = nameprefix.length() ? nameprefix + "_" + field.name : field.name;
*body += " builder.write" +
GenWriteMethod(field.value.type) + "(";
if (field.value.type.base_type == BASE_TYPE_BOOL) {
*body += "Number(Boolean(" + fname + ")));\n";
continue;
} else if (field.value.type.base_type == BASE_TYPE_LONG ||
field.value.type.base_type == BASE_TYPE_ULONG) {
*body += "BigInt(" + fname + " ?? 0));\n";
continue;
}
*body += fname + ");\n";
}
}
}
}
std::string GenerateNewExpression(const std::string &object_name) {
return "new " + namer_.Type(object_name) + "()";
}
void GenerateRootAccessor(StructDef &struct_def, std::string *code_ptr,
std::string &code, const std::string &object_name,
bool size_prefixed) {
if (!struct_def.fixed) {
GenDocComment(code_ptr);
std::string sizePrefixed("SizePrefixed");
code += "static get" + (size_prefixed ? sizePrefixed : "") + "Root" +
GetPrefixedName(struct_def, "As");
code += "(bb:flatbuffers.ByteBuffer, obj?:" + object_name +
"):" + object_name + " {\n";
if (size_prefixed) {
code +=
" bb.setPosition(bb.position() + "
"flatbuffers.SIZE_PREFIX_LENGTH);\n";
}
code += " return (obj || " + GenerateNewExpression(object_name);
code += ").__init(bb.readInt32(bb.position()) + bb.position(), bb);\n";
code += "}\n\n";
}
}
void GenerateFinisher(StructDef &struct_def, std::string *code_ptr,
std::string &code, bool size_prefixed) {
if (parser_.root_struct_def_ == &struct_def) {
std::string sizePrefixed("SizePrefixed");
GenDocComment(code_ptr);
code += "static finish" + (size_prefixed ? sizePrefixed : "") +
GetPrefixedName(struct_def) + "Buffer";
code += "(builder:flatbuffers.Builder, offset:flatbuffers.Offset) {\n";
code += " builder.finish(offset";
if (!parser_.file_identifier_.empty()) {
code += ", '" + parser_.file_identifier_ + "'";
}
if (size_prefixed) {
if (parser_.file_identifier_.empty()) { code += ", undefined"; }
code += ", true";
}
code += ");\n";
code += "}\n\n";
}
}
bool UnionHasStringType(const EnumDef &union_enum) {
return std::any_of(union_enum.Vals().begin(), union_enum.Vals().end(),
[](const EnumVal *ev) {
return !ev->IsZero() && IsString(ev->union_type);
});
}
std::string GenUnionGenericTypeTS(const EnumDef &union_enum) {
// TODO: make it work without any
// return std::string("T") + (UnionHasStringType(union_enum) ? "|string" :
// "");
return std::string("any") +
(UnionHasStringType(union_enum) ? "|string" : "");
}
std::string GenUnionTypeTS(const EnumDef &union_enum, import_set &imports) {
std::string ret;
std::set<std::string> type_list;
for (auto it = union_enum.Vals().begin(); it != union_enum.Vals().end();
++it) {
const auto &ev = **it;
if (ev.IsZero()) { continue; }
std::string type = "";
if (IsString(ev.union_type)) {
type = "string"; // no need to wrap string type in namespace
} else if (ev.union_type.base_type == BASE_TYPE_STRUCT) {
type = AddImport(imports, union_enum, *ev.union_type.struct_def).name;
} else {
FLATBUFFERS_ASSERT(false);
}
type_list.insert(type);
}
for (auto it = type_list.begin(); it != type_list.end(); ++it) {
ret += *it + ((std::next(it) == type_list.end()) ? "" : "|");
}
return ret;
}
static bool CheckIfNameClashes(const import_set &imports,
const std::string &name) {
// TODO: this would be better as a hashset.
for (auto it = imports.begin(); it != imports.end(); it++) {
if (it->second.name == name) { return true; }
}
return false;
}
std::string GenSymbolExpression(const StructDef &struct_def,
const bool has_name_clash,
const std::string &import_name,
const std::string &name,
const std::string &object_name) {
std::string symbols_expression;
if (has_name_clash) {
// We have a name clash
symbols_expression += import_name + " as " + name;
if (parser_.opts.generate_object_based_api) {
symbols_expression += ", " +
GetTypeName(struct_def, /*object_api =*/true) +
" as " + object_name;
}
} else {
// No name clash, use the provided name
symbols_expression += name;
if (parser_.opts.generate_object_based_api) {
symbols_expression += ", " + object_name;
}
}
return symbols_expression;
}
std::string GenSymbolExpression(const EnumDef &enum_def,
const bool has_name_clash,
const std::string &import_name,
const std::string &name,
const std::string &) {
std::string symbols_expression;
if (has_name_clash) {
symbols_expression += import_name + " as " + name;
} else {
symbols_expression += name;
}
if (enum_def.is_union) {
symbols_expression += ", unionTo" + name;
symbols_expression += ", unionListTo" + name;
}
return symbols_expression;
}
template<typename DefinitionT>
ImportDefinition AddImport(import_set &imports, const Definition &dependent,
const DefinitionT &dependency) {
// The unique name of the dependency, fully qualified in its namespace.
const std::string unique_name = GetTypeName(
dependency, /*object_api = */ false, /*force_ns_wrap=*/true);
// Look if we have already added this import and return its name if found.
const auto import_pair = imports.find(unique_name);
if (import_pair != imports.end()) { return import_pair->second; }
// Check if this name would have a name clash with another type. Just use
// the "base" name (properly escaped) without any namespacing applied.
const std::string import_name = GetTypeName(dependency);
const bool has_name_clash = CheckIfNameClashes(imports, import_name);
// If we have a name clash, use the unique name, otherwise use simple name.
std::string name = has_name_clash ? unique_name : import_name;
const std::string object_name =
GetTypeName(dependency, /*object_api=*/true, has_name_clash);
if (parser_.opts.ts_flat_file) {
// In flat-file generation, do not attempt to import things from ourselves
// *and* do not wrap namespaces (note that this does override the logic
// above, but since we force all non-self-imports to use namespace-based
// names in flat file generation, it's fine).
if (dependent.file == dependency.file) {
name = import_name;
} else {
const std::string file =
RelativeToRootPath(StripFileName(AbsolutePath(dependent.file)),
dependency.file)
// Strip the leading //
.substr(2);
flat_file_import_declarations_[file][import_name] = name;
if (parser_.opts.generate_object_based_api &&
SupportsObjectAPI<DefinitionT>::value) {
flat_file_import_declarations_[file][import_name + "T"] = object_name;
}
}
}
const std::string symbols_expression = GenSymbolExpression(
dependency, has_name_clash, import_name, name, object_name);
std::string bare_file_path;
std::string rel_file_path;
const auto &dep_comps = dependent.defined_namespace->components;
for (size_t i = 0; i < dep_comps.size(); i++) {
rel_file_path += i == 0 ? ".." : (kPathSeparator + std::string(".."));
}
if (dep_comps.size() == 0) { rel_file_path += "."; }
bare_file_path +=
kPathSeparator +
namer_.Directories(dependency.defined_namespace->components,
SkipDir::OutputPath) +
namer_.File(dependency, SkipFile::SuffixAndExtension);
rel_file_path += bare_file_path;
ImportDefinition import;
import.name = name;
import.object_name = object_name;
import.bare_file_path = bare_file_path;
import.rel_file_path = rel_file_path;
import.import_statement = "import { " + symbols_expression + " } from '" +
rel_file_path + ".js';";
import.export_statement = "export { " + symbols_expression + " } from '." +
bare_file_path + ".js';";
import.dependency = &dependency;
import.dependent = &dependent;
imports.insert(std::make_pair(unique_name, import));
return import;
}
void AddImport(import_set &imports, std::string import_name,
std::string fileName) {
ImportDefinition import;
import.name = import_name;
import.import_statement =
"import " + import_name + " from '" + fileName + "';";
imports.insert(std::make_pair(import_name, import));
}
// Generate a TS union type based on a union's enum
std::string GenObjApiUnionTypeTS(import_set &imports,
const StructDef &dependent,
const IDLOptions &,
const EnumDef &union_enum) {
std::string ret = "";
std::set<std::string> type_list;
for (auto it = union_enum.Vals().begin(); it != union_enum.Vals().end();
++it) {
const auto &ev = **it;
if (ev.IsZero()) { continue; }
std::string type = "";
if (IsString(ev.union_type)) {
type = "string"; // no need to wrap string type in namespace
} else if (ev.union_type.base_type == BASE_TYPE_STRUCT) {
type = AddImport(imports, dependent, *ev.union_type.struct_def)
.object_name;
} else {
FLATBUFFERS_ASSERT(false);
}
type_list.insert(type);
}
size_t totalPrinted = 0;
for (auto it = type_list.begin(); it != type_list.end(); ++it) {
++totalPrinted;
ret += *it + ((totalPrinted == type_list.size()) ? "" : "|");
}
return ret;
}
std::string GenUnionConvFuncName(const EnumDef &enum_def) {
return namer_.Function("unionTo", enum_def);
}
std::string GenUnionListConvFuncName(const EnumDef &enum_def) {
return namer_.Function("unionListTo", enum_def);
}
std::string GenUnionConvFunc(const Type &union_type, import_set &imports) {
if (union_type.enum_def) {
const auto &enum_def = *union_type.enum_def;
const auto valid_union_type = GenUnionTypeTS(enum_def, imports);
const auto valid_union_type_with_null = valid_union_type + "|null";
auto ret = "\n\nexport function " + GenUnionConvFuncName(enum_def) +
"(\n type: " + GetTypeName(enum_def) +
",\n accessor: (obj:" + valid_union_type + ") => " +
valid_union_type_with_null +
"\n): " + valid_union_type_with_null + " {\n";
const auto enum_type = AddImport(imports, enum_def, enum_def).name;
const auto union_enum_loop = [&](const std::string &accessor_str) {
ret += " switch(" + enum_type + "[type]) {\n";
ret += " case 'NONE': return null; \n";
for (auto it = enum_def.Vals().begin(); it != enum_def.Vals().end();
++it) {
const auto &ev = **it;
if (ev.IsZero()) { continue; }
ret += " case '" + namer_.Variant(ev) + "': ";
if (IsString(ev.union_type)) {
ret += "return " + accessor_str + "'') as string;";
} else if (ev.union_type.base_type == BASE_TYPE_STRUCT) {
const auto type =
AddImport(imports, enum_def, *ev.union_type.struct_def).name;
ret += "return " + accessor_str + "new " + type + "())! as " +
type + ";";
} else {
FLATBUFFERS_ASSERT(false);
}
ret += "\n";
}
ret += " default: return null;\n";
ret += " }\n";
};
union_enum_loop("accessor(");
ret += "}";
ret += "\n\nexport function " + GenUnionListConvFuncName(enum_def) +
"(\n type: " + GetTypeName(enum_def) +
", \n accessor: (index: number, obj:" + valid_union_type +
") => " + valid_union_type_with_null +
", \n index: number\n): " + valid_union_type_with_null + " {\n";
union_enum_loop("accessor(index, ");
ret += "}";
return ret;
}
FLATBUFFERS_ASSERT(0);
return "";
}
// Used for generating a short function that returns the correct class
// based on union enum type. Assume the context is inside the non object api
// type
std::string GenUnionValTS(import_set &imports, const StructDef &dependent,
const std::string &field_name,
const Type &union_type,
const bool is_array = false) {
if (union_type.enum_def) {
const auto &enum_def = *union_type.enum_def;
const auto enum_type = AddImport(imports, dependent, enum_def).name;
const std::string union_accessor = "this." + field_name;
const auto union_has_string = UnionHasStringType(enum_def);
const auto field_binded_method = "this." + field_name + ".bind(this)";
std::string ret;