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* Base Header Generator
*
* Abstract base class for C and C++ header generators.
* Uses Template Method pattern - subclasses implement getRefSuffix() to
* determine pointer (*) vs reference (&) semantics.
*/
import ISymbol from "../../../utils/types/ISymbol";
import IParameterSymbol from "../../../utils/types/IParameterSymbol";
import IHeaderOptions from "../codegen/types/IHeaderOptions";
import IHeaderTypeInput from "./generators/IHeaderTypeInput";
import typeUtils from "./generators/mapType";
import HeaderGeneratorUtils from "./HeaderGeneratorUtils";
const { mapType } = typeUtils;
/** Pass-by-value parameter info from CodeGenerator */
type TPassByValueParams = ReadonlyMap<string, ReadonlySet<string>>;
/**
* Abstract base class for header file generation
*
* Generates header files (.h) from C-Next symbols. Subclasses implement
* getRefSuffix() to control pass-by-reference semantics:
* - CHeaderGenerator returns "*" for pointer-based C semantics
* - CppHeaderGenerator returns "&" for reference-based C++ semantics
*/
abstract class BaseHeaderGenerator {
/**
* Get the suffix for pass-by-reference parameters
* @returns "*" for C pointer semantics, "&" for C++ reference semantics
*/
protected abstract getRefSuffix(): string;
/**
* Generate a header file from symbols
*/
generate(
symbols: ISymbol[],
filename: string,
options: IHeaderOptions = {},
typeInput?: IHeaderTypeInput,
passByValueParams?: TPassByValueParams,
allKnownEnums?: ReadonlySet<string>,
): string {
const guard = HeaderGeneratorUtils.makeGuard(filename, options.guardPrefix);
// Filter to exported symbols if requested
const exportedSymbols = options.exportedOnly
? symbols.filter((s) => s.isExported)
: symbols;
// Group symbols by kind
const groups = HeaderGeneratorUtils.groupSymbolsByKind(exportedSymbols);
// Get local type names for external type detection
const localTypes = HeaderGeneratorUtils.getLocalTypeNames(groups);
// Collect external type dependencies
const externalTypes = HeaderGeneratorUtils.collectExternalTypes(
groups.functions,
groups.variables,
localTypes.localStructNames,
localTypes.localEnumNames,
localTypes.localTypeNames,
localTypes.localBitmapNames,
allKnownEnums,
);
// Build external type header includes
const { typesWithHeaders, headersToInclude } =
HeaderGeneratorUtils.buildExternalTypeIncludes(
externalTypes,
options.externalTypeHeaders,
);
// Get symbol table for C++ namespace detection
const symbolTable = typeInput?.symbolTable;
// Filter to C-compatible external types
const cCompatibleExternalTypes =
HeaderGeneratorUtils.filterCCompatibleTypes(
externalTypes,
typesWithHeaders,
symbolTable,
);
// Filter to C-compatible variables
const cCompatibleVariables =
HeaderGeneratorUtils.filterCCompatibleVariables(
groups.variables,
symbolTable,
);
// Build header sections using utility methods
const lines: string[] = [
...HeaderGeneratorUtils.generateHeaderStart(guard),
...HeaderGeneratorUtils.generateIncludes(options, headersToInclude),
...HeaderGeneratorUtils.generateCppWrapperStart(),
...HeaderGeneratorUtils.generateForwardDeclarations(
cCompatibleExternalTypes,
),
...HeaderGeneratorUtils.generateEnumSection(groups.enums, typeInput),
...HeaderGeneratorUtils.generateBitmapSection(groups.bitmaps, typeInput),
...HeaderGeneratorUtils.generateTypeAliasSection(groups.types),
...HeaderGeneratorUtils.generateStructSection(
groups.structs,
groups.classes,
typeInput,
),
...HeaderGeneratorUtils.generateVariableSection(cCompatibleVariables),
...this.generateFunctionSection(
groups.functions,
passByValueParams,
allKnownEnums,
),
...HeaderGeneratorUtils.generateHeaderEnd(guard),
];
return lines.join("\n");
}
/**
* Generate function prototypes section
*/
private generateFunctionSection(
functions: ISymbol[],
passByValueParams?: TPassByValueParams,
allKnownEnums?: ReadonlySet<string>,
): string[] {
if (functions.length === 0) {
return [];
}
const lines: string[] = ["/* Function prototypes */"];
for (const sym of functions) {
const proto = this.generateFunctionPrototype(
sym,
passByValueParams,
allKnownEnums,
);
Eif (proto) {
lines.push(proto);
}
}
lines.push("");
return lines;
}
/**
* Generate a function prototype
*/
private generateFunctionPrototype(
sym: ISymbol,
passByValueParams?: TPassByValueParams,
allKnownEnums?: ReadonlySet<string>,
): string | null {
// Map return type (main() always returns int)
const mappedType = sym.type ? mapType(sym.type) : "void";
const returnType = sym.name === "main" ? "int" : mappedType;
// Get pass-by-value parameter names for this function
const passByValueSet = passByValueParams?.get(sym.name);
// Build parameter list
let params = "void";
if (sym.parameters && sym.parameters.length > 0) {
const translatedParams = sym.parameters.map((p) =>
this.generateParameter(p, passByValueSet, allKnownEnums),
);
params = translatedParams.join(", ");
}
return `${returnType} ${sym.name}(${params});`;
}
/**
* Generate a single parameter with appropriate semantics
*/
private generateParameter(
p: IParameterSymbol,
passByValueSet?: ReadonlySet<string>,
allKnownEnums?: ReadonlySet<string>,
): string {
const baseType = mapType(p.type);
const constMod = p.isConst ? "const " : "";
const autoConst = p.isAutoConst ? "const " : "";
// Array parameters - pass naturally as pointers per C semantics
if (p.isArray && p.arrayDimensions) {
const dims = p.arrayDimensions.map((d) => `[${d}]`).join("");
if (p.type === "string") {
return `${autoConst}${constMod}char* ${p.name}${dims}`;
}
return `${autoConst}${constMod}${baseType} ${p.name}${dims}`;
}
// ISR is a function pointer typedef - no pointer needed
if (p.type === "ISR") {
return `${constMod}${baseType} ${p.name}`;
}
// Float types use standard pass-by-value
if (p.type === "f32" || p.type === "f64") {
return `${constMod}${baseType} ${p.name}`;
}
// Enum types use pass-by-value (like primitives)
if (allKnownEnums?.has(p.type)) {
return `${constMod}${baseType} ${p.name}`;
}
// Check if parameter should be passed by value
if (passByValueSet?.has(p.name)) {
return `${constMod}${baseType} ${p.name}`;
}
// Default: pass by reference using subclass-specific semantics
return `${autoConst}${constMod}${baseType}${this.getRefSuffix()} ${p.name}`;
}
}
export default BaseHeaderGenerator;
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