export function combineRenderResults(result: MultiFileRenderResult): SerializedRenderResult {
    if (result.size <= 1) {
        const first = mapFirst(result);
        if (first === undefined) {
            return { lines: [], annotations: [] };
        }
        return first;
    }
    let lines: string[] = [];
    let annotations: Annotation[] = [];
    for (const [filename, srr] of result) {
        const offset = lines.length + 2;
        lines = lines.concat([`// ${filename}`, ""], srr.lines);
        annotations = annotations.concat(
            srr.annotations.map(ann => ({ annotation: ann.annotation, span: offsetSpan(ann.span, offset) }))
        );
    }
    return { lines, annotations };
}

    protected emitLeadingComments(): void {
        if (this.leadingComments !== undefined) {
            this.emitCommentLines(this.leadingComments);
            return;
        }

        const topLevelName = defined(mapFirst(this.topLevels));
        this.emitMultiline(
            `// Example code that deserializes and serializes the model.
// extern crate serde;
// #[macro_use]
// extern crate serde_derive;
// extern crate serde_json;
//
// use generated_module::${topLevelName};
//
// fn main() {
//     let json = r#"{"answer": 42}"#;
//     let model: ${topLevelName} = serde_json::from_str(&json).unwrap();
// }`
        );
    }

    protected emitSourceStructure(): void {
        // FIXME: Find a good way to do multiple top-levels.  Maybe multiple files?
        const topLevelType = this.topLevels.size === 1 ? this.schemaForType(defined(mapFirst(this.topLevels))) : {};
        const schema = Object.assign({ $schema: "http://json-schema.org/draft-06/schema#" }, topLevelType);
        const definitions: { [name: string]: Schema } = {};
        this.forEachObject("none", (o: ObjectType, name: Name) => {
            const title = defined(this.names.get(name));
            definitions[title] = this.definitionForObject(o, title);
        });
        this.forEachUnion("none", (u, name) => {
            if (!this.unionNeedsName(u)) return;
            const title = defined(this.names.get(name));
            definitions[title] = this.definitionForUnion(u, title);
        });
        this.forEachEnum("none", (e, name) => {
            const title = defined(this.names.get(name));
            definitions[title] = this.definitionForEnum(e, title);
        });
        schema.definitions = definitions;

        this.emitMultiline(JSON.stringify(schema, undefined, "    "));
    }

    protected emitSourceStructure(proposedFilename: string): void {
        const fileMode = proposedFilename !== "stdout";
        if (!fileMode) {
            // We don't have a filename, so we use a top-level name
            const firstTopLevel = defined(mapFirst(this.topLevels));
            proposedFilename = this.sourcelikeToString(this.nameForNamedType(firstTopLevel)) + ".m";
        }
        const [filename, extension] = splitExtension(proposedFilename);

        if (this._options.features.interface) {
            this.startFile(filename, "h");

            if (this.leadingComments !== undefined) {
                this.emitCommentLines(this.leadingComments);
            } else if (!this._options.justTypes) {
                this.emitCommentLines(["To parse this JSON:", ""]);
                this.emitLine("//   NSError *error;");
                this.forEachTopLevel("none", (t, topLevelName) => {
                    const fromJsonExpression =
                        t instanceof ClassType
                            ? ["[", topLevelName, " fromJSON:json encoding:NSUTF8Encoding error:&error];"]
                            : [topLevelName, "FromJSON(json, NSUTF8Encoding, &error);"];
                    this.emitLine(
                        "//   ",
                        topLevelName,
                        " *",
                        this.variableNameForTopLevel(topLevelName),
                        " = ",
                        fromJsonExpression
                    );
                });
            }

            this.ensureBlankLine();
            this.emitLine(`#import <Foundation/Foundation.h>`);
            this.ensureBlankLine();

            // Emit @class declarations for top-level array+maps and classes
            this.forEachNamedType(
                "none",
                (_: ClassType, className: Name) => this.emitLine("@class ", className, ";"),
                (_, enumName) => this.emitLine("@class ", enumName, ";"),
                () => null
            );
            this.ensureBlankLine();

            this.ensureBlankLine();
            this.emitLine("NS_ASSUME_NONNULL_BEGIN");
            this.ensureBlankLine();

            if (this.haveEnums) {
                this.emitMark("Boxed enums");
                this.forEachEnum("leading-and-interposing", (t, n) => this.emitPseudoEnumInterface(t, n));
            }

            // Emit interfaces for top-level array+maps and classes
            this.forEachTopLevel(
                "leading-and-interposing",
                (t, n) => this.emitNonClassTopLevelTypedef(t, n),
                t => !(t instanceof ClassType)
            );

            const hasTopLevelNonClassTypes = iterableSome(this.topLevels, ([_, t]) => !(t instanceof ClassType));
            if (!this._options.justTypes && (hasTopLevelNonClassTypes || this._options.marshallingFunctions)) {
                this.ensureBlankLine();
                this.emitMark("Top-level marshaling functions");
                this.forEachTopLevel(
                    "leading-and-interposing",
                    (t, n) => this.emitTopLevelFunctionDeclarations(t, n),
                    // Objective-C developers get freaked out by C functions, so we don't
                    // declare them for top-level object types (we always need them for non-object types)
                    t => this._options.marshallingFunctions || !(t instanceof ClassType)
                );
            }

            this.emitMark("Object interfaces");
            this.forEachNamedType("leading-and-interposing", (c: ClassType, className: Name) => this.emitClassInterface(c, className), () => null, () => null);

            this.ensureBlankLine();
            this.emitLine("NS_ASSUME_NONNULL_END");
            this.finishFile();
        }

        if (this._options.features.implementation) {
            this.startFile(filename, extension);

            this.emitLine(`#import "${filename}.h"`);
            this.ensureBlankLine();

            if (!this._options.justTypes) {
                this.ensureBlankLine();
                this.emitExtraComments("Shorthand for simple blocks");
                this.emitLine(`#define Îť(decl, expr) (^(decl) { return (expr); })`);
                this.ensureBlankLine();
                this.emitExtraComments("nil → NSNull conversion for JSON dictionaries");
                this.emitBlock("static id NSNullify(id _Nullable x)", () =>
                    this.emitLine("return (x == nil || x == NSNull.null) ? NSNull.null : x;")
                );
                this.ensureBlankLine();
                this.emitLine("NS_ASSUME_NONNULL_BEGIN");
//.........这里部分代码省略.........