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* Transpiler
* Unified transpiler for both single-file and multi-file builds
*
* Key insight from ADR-053: "A single file transpilation is just a project
* with one .cnx file."
*
* Architecture: Both run() and transpileSource() are thin wrappers that
* discover files and delegate to _executePipeline(). There is ONE pipeline
* for all transpilation — no branching on context/standalone mode.
*/
import { join, basename, dirname, resolve } from "node:path";
import IFileSystem from "./types/IFileSystem";
import NodeFileSystem from "./NodeFileSystem";
import CNextSourceParser from "./logic/parser/CNextSourceParser";
import HeaderParser from "./logic/parser/HeaderParser";
import CodeGenerator from "./output/codegen/CodeGenerator";
import CodeGenState from "./output/codegen/CodeGenState";
import HeaderGenerator from "./output/headers/HeaderGenerator";
import ExternalTypeHeaderBuilder from "./output/headers/ExternalTypeHeaderBuilder";
import ICodeGenSymbols from "./types/ICodeGenSymbols";
import IncludeExtractor from "./logic/IncludeExtractor";
import SymbolTable from "./logic/symbols/SymbolTable";
import ESymbolKind from "../utils/types/ESymbolKind";
import ISymbol from "../utils/types/ISymbol";
import CNextResolver from "./logic/symbols/cnext";
import TSymbolAdapter from "./logic/symbols/cnext/adapters/TSymbolAdapter";
import TSymbolInfoAdapter from "./logic/symbols/cnext/adapters/TSymbolInfoAdapter";
import CSymbolCollector from "./logic/symbols/CSymbolCollector";
import CppSymbolCollector from "./logic/symbols/CppSymbolCollector";
import Preprocessor from "./logic/preprocessor/Preprocessor";
import FileDiscovery from "./data/FileDiscovery";
import EFileType from "./data/types/EFileType";
import IDiscoveredFile from "./data/types/IDiscoveredFile";
import IncludeDiscovery from "./data/IncludeDiscovery";
import IncludeResolver from "./data/IncludeResolver";
import IncludeTreeWalker from "./data/IncludeTreeWalker";
import DependencyGraph from "./data/DependencyGraph";
import PathResolver from "./data/PathResolver";
import ParserUtils from "../utils/ParserUtils";
import ITranspilerConfig from "./types/ITranspilerConfig";
import ITranspilerResult from "./types/ITranspilerResult";
import IFileResult from "./types/IFileResult";
import IPipelineFile from "./types/IPipelineFile";
import IPipelineInput from "./types/IPipelineInput";
import ITranspileError from "../lib/types/ITranspileError";
import TranspilerState from "./types/TranspilerState";
import runAnalyzers from "./logic/analysis/runAnalyzers";
import ModificationAnalyzer from "./logic/analysis/ModificationAnalyzer";
import AnalyzerContextBuilder from "./logic/analysis/AnalyzerContextBuilder";
import CacheManager from "../utils/cache/CacheManager";
import MapUtils from "../utils/MapUtils";
import detectCppSyntax from "./logic/detectCppSyntax";
import AutoConstUpdater from "./logic/symbols/AutoConstUpdater";
import TransitiveEnumCollector from "./logic/symbols/TransitiveEnumCollector";
/**
* Unified transpiler
*/
class Transpiler {
private readonly config: Required<ITranspilerConfig>;
private readonly symbolTable: SymbolTable;
private readonly preprocessor: Preprocessor;
private readonly codeGenerator: CodeGenerator;
private readonly headerGenerator: HeaderGenerator;
private readonly warnings: string[];
private readonly cacheManager: CacheManager | null;
/** Issue #211: Tracks if C++ output is needed (one-way flag, false → true only) */
private cppDetected: boolean;
/** Issue #587: Encapsulated state for accumulated Maps/Sets */
private readonly state = new TranspilerState();
/**
* Issue #593: Centralized analyzer for cross-file const inference in C++ mode.
* Accumulates parameter modifications and param lists across all processed files.
*/
private readonly modificationAnalyzer = new ModificationAnalyzer();
/** Issue #586: Centralized path resolution for output files */
private readonly pathResolver: PathResolver;
/** File system abstraction for testability */
private readonly fs: IFileSystem;
constructor(config: ITranspilerConfig, fs?: IFileSystem) {
// Use injected file system or default to Node.js implementation
this.fs = fs ?? new NodeFileSystem();
// Apply defaults
this.config = {
inputs: config.inputs,
includeDirs: config.includeDirs ?? [],
outDir: config.outDir ?? "",
headerOutDir: config.headerOutDir ?? "",
basePath: config.basePath ?? "",
defines: config.defines ?? {},
preprocess: config.preprocess ?? true,
cppRequired: config.cppRequired ?? false,
parseOnly: config.parseOnly ?? false,
debugMode: config.debugMode ?? false,
target: config.target ?? "",
collectGrammarCoverage: config.collectGrammarCoverage ?? false,
noCache: config.noCache ?? false,
};
// Issue #211: Initialize cppDetected from config (--cpp flag sets this)
this.cppDetected = this.config.cppRequired;
this.symbolTable = new SymbolTable();
this.preprocessor = new Preprocessor();
this.codeGenerator = new CodeGenerator();
this.headerGenerator = new HeaderGenerator();
this.warnings = [];
// Issue #586: Initialize path resolver
this.pathResolver = new PathResolver(
{
inputs: this.config.inputs,
outDir: this.config.outDir,
headerOutDir: this.config.headerOutDir,
basePath: this.config.basePath,
},
this.fs,
);
// Initialize cache manager if caching is enabled and project root can be determined
const projectRoot = this.config.noCache
? undefined
: this.determineProjectRoot();
this.cacheManager = projectRoot
? new CacheManager(projectRoot, this.fs)
: null;
}
// ===========================================================================
// Public API: run() and transpileSource()
// ===========================================================================
/**
* Execute the unified pipeline from CLI inputs.
*
* Stage 1 (file discovery) happens here, then delegates to _executePipeline().
*/
async run(): Promise<ITranspilerResult> {
const result = this._initResult();
try {
await this._initializeRun();
// Stage 1: Discover source files
const { cnextFiles, headerFiles } = await this.discoverSources();
if (cnextFiles.length === 0) {
return this._finalizeResult(result, "No C-Next source files found");
}
this._ensureOutputDirectories();
// Convert IDiscoveredFile[] to IPipelineFile[] (disk-based, all get code gen)
const pipelineFiles: IPipelineFile[] = cnextFiles.map((f) => ({
path: f.path,
discoveredFile: f,
}));
const input: IPipelineInput = {
cnextFiles: pipelineFiles,
headerFiles,
writeOutputToDisk: true,
};
await this._executePipeline(input, result);
return await this._finalizeResult(result);
} catch (err) {
return this._handleRunError(result, err);
}
}
/**
* Transpile source code provided as a string.
*
* Discovers includes from the source, builds an IPipelineInput, and
* delegates to the same _executePipeline() as run().
*
* @param source - The C-Next source code as a string
* @param options - Options for transpilation
* @returns Promise<IFileResult> with generated code or errors
*/
async transpileSource(
source: string,
options?: {
workingDir?: string;
includeDirs?: string[];
sourcePath?: string;
},
): Promise<IFileResult> {
const workingDir = options?.workingDir ?? process.cwd();
const additionalIncludeDirs = options?.includeDirs ?? [];
const sourcePath = options?.sourcePath ?? "<string>";
try {
await this._initializeRun();
const input = this._discoverFromSource(
source,
workingDir,
additionalIncludeDirs,
sourcePath,
);
const result = this._initResult();
await this._executePipeline(input, result);
// Find our main file's result
const fileResult = result.files.find((f) => f.sourcePath === sourcePath);
if (fileResult) {
return fileResult;
}
// No file result found — pipeline exited early (e.g., parse errors in Stage 3)
// Return pipeline errors as a file result
Eif (result.errors.length > 0) {
return this.buildErrorResult(sourcePath, result.errors, 0);
}
return this.buildErrorResult(
sourcePath,
[
{
line: 1,
column: 0,
message: "Pipeline produced no result for source file",
severity: "error",
},
],
0,
);
} catch (err) {
return this.buildCatchResult(sourcePath, err);
}
}
// ===========================================================================
// Unified Pipeline
// ===========================================================================
/**
* The single unified pipeline for all transpilation.
*
* Both run() and transpileSource() delegate here after file discovery.
*
* Stage 2: Collect symbols from C/C++ headers
* Stage 3: Collect symbols from C-Next files
* Stage 3b: Resolve external const array dimensions
* Stage 4: Check for symbol conflicts
* Stage 5: Generate code (per-file)
* Stage 6: Generate headers (per-file)
*/
private async _executePipeline(
input: IPipelineInput,
result: ITranspilerResult,
): Promise<void> {
// Stage 2: Collect symbols from C/C++ headers
this._collectAllHeaderSymbols(input.headerFiles, result);
// Stage 3: Collect symbols from C-Next files
if (!this._collectAllCNextSymbolsFromPipeline(input.cnextFiles, result)) {
return;
}
// Stage 3b: Resolve external const array dimensions
this.symbolTable.resolveExternalArrayDimensions();
// Stage 4: Check for symbol conflicts (skipped in standalone mode)
if (!input.skipConflictCheck && !this._checkSymbolConflicts(result)) {
return;
}
// Stage 5: Analyze and transpile each C-Next file
for (const file of input.cnextFiles) {
if (file.symbolOnly) {
continue;
}
const fileResult = this._transpileFile(file);
this._recordFileResult(
file.discoveredFile,
fileResult,
result,
input.writeOutputToDisk,
);
}
// Stage 6: Generate headers (only write to disk in run() mode)
if (result.success && input.writeOutputToDisk) {
this._generateAllHeadersFromPipeline(input.cnextFiles, result);
}
}
/**
* Stage 3 for pipeline files: Collect symbols from all C-Next files.
*
* Reads source from file.source or disk, then collects symbols.
* @returns true if successful, false if errors occurred
*/
private _collectAllCNextSymbolsFromPipeline(
cnextFiles: IPipelineFile[],
result: ITranspilerResult,
): boolean {
for (const file of cnextFiles) {
const errors = this._doCollectCNextSymbolsFromPipeline(file);
if (errors) {
result.errors.push(...errors);
result.success = false;
}
}
return result.success;
}
/**
* Collect symbols from a single C-Next pipeline file.
* Uses file.source when available (in-memory), otherwise reads from disk.
*
* @returns null on success, or an array of ITranspileError on failure
*/
private _doCollectCNextSymbolsFromPipeline(
file: IPipelineFile,
): ITranspileError[] | null {
const content = file.source ?? this.fs.readFile(file.path);
const { tree, errors } = CNextSourceParser.parse(content);
// Parse errors — return them with original line/column and sourcePath
if (errors.length > 0) {
return errors.map((e) => ({ ...e, sourcePath: file.path }));
}
try {
// ADR-055: Use composable collectors via CNextResolver + TSymbolAdapter
const tSymbols = CNextResolver.resolve(tree, file.path);
const iSymbols = TSymbolAdapter.toISymbols(tSymbols, this.symbolTable);
this.symbolTable.addSymbols(iSymbols);
// Issue #465: Store ICodeGenSymbols for external enum resolution in stage 5
const symbolInfo = TSymbolInfoAdapter.convert(tSymbols);
this.state.setFileSymbolInfo(file.path, symbolInfo);
// Issue #593: Collect modification analysis in C++ mode
if (this.cppDetected) {
const results = this.codeGenerator.analyzeModificationsOnly(
tree,
this.modificationAnalyzer.getModifications(),
this.modificationAnalyzer.getParamLists(),
);
this.modificationAnalyzer.accumulateResults(results);
}
} catch (err) {
// Symbol collection errors (e.g., BitmapCollector) — format as "Code generation failed"
const rawMessage = err instanceof Error ? err.message : String(err);
const parsed = ParserUtils.parseErrorLocation(rawMessage);
return [
{
line: parsed.line,
column: parsed.column,
message: `Code generation failed: ${parsed.message}`,
severity: "error",
},
];
}
return null;
}
/**
* Stage 5: Transpile a single C-Next file.
*
* Assumes the symbol table is already populated (stages 2-3 complete).
* Directly updates this.state and this.modificationAnalyzer.
*/
private _transpileFile(file: IPipelineFile): IFileResult {
const sourcePath = file.path;
const source = file.source ?? this.fs.readFile(file.path);
try {
// Parse source
const { tree, tokenStream, errors, declarationCount } =
CNextSourceParser.parse(source);
Iif (errors.length > 0) {
return this.buildErrorResult(sourcePath, errors, declarationCount);
}
// Parse only mode
if (this.config.parseOnly) {
return this.buildParseOnlyResult(sourcePath, declarationCount);
}
// Run analyzers
const externalStructFields =
AnalyzerContextBuilder.buildExternalStructFields(this.symbolTable);
const analyzerErrors = runAnalyzers(tree, tokenStream, {
externalStructFields,
symbolTable: this.symbolTable,
});
if (analyzerErrors.length > 0) {
return this.buildErrorResult(
sourcePath,
analyzerErrors,
declarationCount,
);
}
// Build symbolInfo for code generation
const tSymbols = CNextResolver.resolve(tree, sourcePath);
let symbolInfo = TSymbolInfoAdapter.convert(tSymbols);
// Merge enum info from included .cnx files
const externalEnumSources = this._collectExternalEnumSources(
sourcePath,
file.cnextIncludes,
);
if (externalEnumSources.length > 0) {
symbolInfo = TSymbolInfoAdapter.mergeExternalEnums(
symbolInfo,
externalEnumSources,
);
}
// Inject cross-file modification data for const inference
this._setupCrossFileModifications();
// Generate code
const code = this.codeGenerator.generate(
tree,
this.symbolTable,
tokenStream,
{
debugMode: this.config.debugMode,
target: this.config.target,
sourcePath,
cppMode: this.cppDetected,
symbolInfo,
},
);
// Collect user includes
const userIncludes = IncludeExtractor.collectUserIncludes(tree);
// Get pass-by-value params (snapshot before next file clears it)
const passByValue = this.codeGenerator.getPassByValueParams();
const passByValueCopy = MapUtils.deepCopyStringSetMap(passByValue);
// Directly update state (no contribution round-trip)
this.state.setSymbolInfo(sourcePath, symbolInfo);
this.state.setPassByValueParams(sourcePath, passByValueCopy);
this.state.setUserIncludes(sourcePath, [...userIncludes]);
// Accumulate C++ modifications directly
if (this.cppDetected) {
this._accumulateFileModifications();
}
// Update symbol parameters with auto-const info
const symbols = this.symbolTable.getSymbolsByFile(sourcePath);
const unmodifiedParams = this.codeGenerator.getFunctionUnmodifiedParams();
const knownEnums =
this.state.getSymbolInfo(sourcePath)?.knownEnums ?? new Set<string>();
AutoConstUpdater.update(symbols, unmodifiedParams, knownEnums);
// Generate header content
const headerCode = this.generateHeaderContent(
symbols,
sourcePath,
this.symbolTable,
this.cppDetected,
userIncludes,
passByValueCopy,
symbolInfo,
);
return this.buildSuccessResult(
sourcePath,
code,
headerCode,
declarationCount,
);
} catch (err) {
return this.buildCatchResult(sourcePath, err);
}
}
/**
* Accumulate C++ modification data from the code generator into the
* centralized modification analyzer.
*/
private _accumulateFileModifications(): void {
const fileModifications = this.codeGenerator.getModifiedParameters();
const modifiedParameters = new Map<string, Set<string>>();
for (const [funcName, params] of fileModifications) {
modifiedParameters.set(funcName, new Set(params));
}
const fileParamLists = this.codeGenerator.getFunctionParamLists();
const functionParamLists = new Map<string, readonly string[]>();
for (const [funcName, params] of fileParamLists) {
functionParamLists.set(funcName, [...params]);
}
this.modificationAnalyzer.accumulateModifications(modifiedParameters);
this.modificationAnalyzer.accumulateParamLists(functionParamLists);
}
// ===========================================================================
// File Discovery
// ===========================================================================
/**
* Build IPipelineInput from a source string (standalone mode).
*
* Absorbs what StandaloneContextBuilder used to do, but returns data
* instead of performing side effects.
*/
private _discoverFromSource(
source: string,
workingDir: string,
additionalIncludeDirs: string[],
sourcePath: string,
): IPipelineInput {
// Build search paths
const searchPaths = IncludeResolver.buildSearchPaths(
workingDir,
this.config.includeDirs,
additionalIncludeDirs,
undefined,
this.fs,
);
// Resolve includes from source content
const resolver = new IncludeResolver(searchPaths, this.fs);
const resolved = resolver.resolve(source, sourcePath);
this.warnings.push(...resolved.warnings);
// Resolve C/C++ headers transitively
const { headers: allHeaders, warnings: headerWarnings } =
IncludeResolver.resolveHeadersTransitively(
resolved.headers,
[...this.config.includeDirs],
{
onDebug: this.config.debugMode
? (msg) => console.log(`[DEBUG] ${msg}`)
: undefined,
processedPaths: this.state.getProcessedHeadersSet(),
fs: this.fs,
},
);
this.warnings.push(...headerWarnings);
// Store header include directives
for (const header of allHeaders) {
const directive = resolved.headerIncludeDirectives.get(header.path);
if (directive) {
this.state.setHeaderDirective(header.path, directive);
}
}
// Walk C-Next includes transitively to build include file list
const cnextIncludeFiles: IPipelineFile[] = [];
IncludeTreeWalker.walk(
resolved.cnextIncludes,
this.config.includeDirs,
(file) => {
cnextIncludeFiles.push({
path: file.path,
discoveredFile: file,
symbolOnly: true,
});
},
);
// Build the main file (with in-memory source and cnextIncludes for enum resolution)
const mainFile: IPipelineFile = {
path: sourcePath,
source,
discoveredFile: {
path: sourcePath,
type: EFileType.CNext,
extension: ".cnx",
},
cnextIncludes: resolved.cnextIncludes,
};
// Includes first (symbols must be collected before main file code gen),
// then main file
return {
cnextFiles: [...cnextIncludeFiles, mainFile],
headerFiles: allHeaders,
writeOutputToDisk: false,
skipConflictCheck: true,
};
}
// ===========================================================================
// Pipeline Helper Methods
// ===========================================================================
/**
* Initialize a fresh result object
*/
private _initResult(): ITranspilerResult {
return {
success: true,
files: [],
filesProcessed: 0,
symbolsCollected: 0,
conflicts: [],
errors: [],
warnings: [],
outputFiles: [],
};
}
/**
* Initialize run state: cache, analyzers, symbol table
*/
private async _initializeRun(): Promise<void> {
if (this.cacheManager) {
await this.cacheManager.initialize();
}
// Issue #593: Reset cross-file modification tracking for new run
this.modificationAnalyzer.clear();
// Issue #587: Reset accumulated state for new run
this.state.reset();
// Issue #634: Reset symbol table for new run
this.symbolTable.clear();
}
/**
* Ensure output directories exist
*/
private _ensureOutputDirectories(): void {
if (this.config.outDir && !this.fs.exists(this.config.outDir)) {
this.fs.mkdir(this.config.outDir, { recursive: true });
}
if (this.config.headerOutDir && !this.fs.exists(this.config.headerOutDir)) {
this.fs.mkdir(this.config.headerOutDir, { recursive: true });
}
}
/**
* Stage 2: Collect symbols from all C/C++ headers
*/
private _collectAllHeaderSymbols(
headerFiles: IDiscoveredFile[],
result: ITranspilerResult,
): void {
for (const file of headerFiles) {
try {
this.doCollectHeaderSymbols(file);
result.filesProcessed++;
} catch (err) {
this.warnings.push(`Failed to process header ${file.path}: ${err}`);
}
}
}
/**
* Stage 4: Check for symbol conflicts
* @returns true if no blocking conflicts, false otherwise
*/
private _checkSymbolConflicts(result: ITranspilerResult): boolean {
const conflicts = this.symbolTable.getConflicts();
for (const conflict of conflicts) {
result.conflicts.push(conflict.message);
Eif (conflict.severity === "error") {
result.success = false;
}
}
if (!result.success) {
result.errors.push({
line: 1,
column: 0,
message: "Symbol conflicts detected - cannot proceed",
severity: "error",
});
}
return result.success;
}
/**
* Record file result and optionally write output to disk
*/
private _recordFileResult(
file: IDiscoveredFile,
fileResult: IFileResult,
result: ITranspilerResult,
writeOutputToDisk: boolean,
): void {
let outputPath: string | undefined;
if (
writeOutputToDisk &&
this.config.outDir &&
fileResult.success &&
fileResult.code
) {
outputPath = this.pathResolver.getOutputPath(file, this.cppDetected);
this.fs.writeFile(outputPath, fileResult.code);
}
result.files.push({ ...fileResult, outputPath });
result.filesProcessed++;
if (!fileResult.success) {
result.success = false;
result.errors.push(
...fileResult.errors.map((e) => ({
...e,
sourcePath: fileResult.sourcePath,
})),
);
} else if (outputPath) {
result.outputFiles.push(outputPath);
}
}
/**
* Stage 6: Generate headers for pipeline files
*/
private _generateAllHeadersFromPipeline(
cnextFiles: IPipelineFile[],
result: ITranspilerResult,
): void {
for (const file of cnextFiles) {
Iif (file.symbolOnly) {
continue;
}
const headerPath = this.generateHeader(file.discoveredFile);
if (headerPath) {
result.outputFiles.push(headerPath);
}
}
}
/**
* Finalize result: merge warnings, flush cache
*/
private async _finalizeResult(
result: ITranspilerResult,
warning?: string,
): Promise<ITranspilerResult> {
if (warning) {
result.warnings.push(warning);
}
result.symbolsCollected = this.symbolTable.size;
result.warnings = [...result.warnings, ...this.warnings];
if (this.cacheManager) {
await this.cacheManager.flush();
}
return result;
}
/**
* Handle errors during run
*/
private _handleRunError(
result: ITranspilerResult,
err: unknown,
): ITranspilerResult {
result.errors.push({
line: 1,
column: 0,
message: `Pipeline failed: ${err}`,
severity: "error",
});
result.success = false;
result.warnings = [...result.warnings, ...this.warnings];
return result;
}
// ===========================================================================
// Source Discovery (Stage 1 for run())
// ===========================================================================
/**
* Discover C-Next files from a single input (file or directory).
*/
private _discoverCNextFromInput(
input: string,
cnextFiles: IDiscoveredFile[],
fileByPath: Map<string, IDiscoveredFile>,
): void {
const resolvedInput = resolve(input);
if (!this.fs.exists(resolvedInput)) {
throw new Error(`Input not found: ${input}`);
}
const file = FileDiscovery.discoverFile(resolvedInput, this.fs);
if (file?.type === EFileType.CNext) {
cnextFiles.push(file);
fileByPath.set(resolve(file.path), file);
return;
}
Iif (file?.type !== EFileType.Unknown && file !== null) {
// Other supported file type (direct header input) - skip for now
return;
}
// It's a directory - scan for C-Next files
const discovered = FileDiscovery.discover(
[resolvedInput],
{ recursive: true },
this.fs,
);
for (const f of FileDiscovery.getCNextFiles(discovered)) {
cnextFiles.push(f);
fileByPath.set(resolve(f.path), f);
}
}
/**
* Collect headers from resolved includes, filtering out generated ones.
*/
private _collectHeaders(
resolved: {
headers: IDiscoveredFile[];
headerIncludeDirectives: Map<string, string>;
},
cnextBaseNames: Set<string>,
headerSet: Map<string, IDiscoveredFile>,
): void {
for (const header of resolved.headers) {
const headerBaseName = basename(header.path).replace(
/\.h$|\.hpp$|\.hxx$|\.hh$/,
"",
);
Iif (cnextBaseNames.has(headerBaseName)) {
continue;
}
headerSet.set(header.path, header);
// Issue #497: Store the include directive for this header
const directive = resolved.headerIncludeDirectives.get(header.path);
Eif (directive) {
this.state.setHeaderDirective(header.path, directive);
}
}
}
/**
* Process C-Next includes from resolved includes.
* Issue #461: Collect included .cnx files for symbol resolution
* Issue #580: Track dependencies for topological sorting
*/
private _processCnextIncludes(
resolved: { cnextIncludes: IDiscoveredFile[] },
cnxPath: string,
depGraph: DependencyGraph,
cnextFiles: IDiscoveredFile[],
cnextBaseNames: Set<string>,
fileByPath: Map<string, IDiscoveredFile>,
): void {
for (const cnxInclude of resolved.cnextIncludes) {
const includePath = resolve(cnxInclude.path);
const includeBaseName = basename(includePath).replace(
/\.cnx$|\.cnext$/,
"",
);
depGraph.addDependency(cnxPath, includePath);
// Don't add if already in the list
const alreadyExists =
cnextBaseNames.has(includeBaseName) ||
cnextFiles.some((f) => resolve(f.path) === includePath);
Eif (!alreadyExists) {
cnextFiles.push(cnxInclude);
cnextBaseNames.add(includeBaseName);
fileByPath.set(includePath, cnxInclude);
}
}
}
/**
* Process a single C-Next file's includes.
*/
private _processFileIncludes(
cnxFile: IDiscoveredFile,
depGraph: DependencyGraph,
cnextFiles: IDiscoveredFile[],
cnextBaseNames: Set<string>,
headerSet: Map<string, IDiscoveredFile>,
fileByPath: Map<string, IDiscoveredFile>,
): void {
const cnxPath = resolve(cnxFile.path);
depGraph.addFile(cnxPath);
const content = this.fs.readFile(cnxFile.path);
// Build search paths for this file
const sourceDir = dirname(cnxFile.path);
const additionalIncludeDirs = IncludeDiscovery.discoverIncludePaths(
cnxFile.path,
this.fs,
);
const searchPaths = IncludeResolver.buildSearchPaths(
sourceDir,
this.config.includeDirs,
additionalIncludeDirs,
undefined,
this.fs,
);
// Resolve includes
const resolver = new IncludeResolver(searchPaths, this.fs);
const resolved = resolver.resolve(content, cnxFile.path);
this._collectHeaders(resolved, cnextBaseNames, headerSet);
this._processCnextIncludes(
resolved,
cnxPath,
depGraph,
cnextFiles,
cnextBaseNames,
fileByPath,
);
this.warnings.push(...resolved.warnings);
}
/**
* Sort files topologically and convert paths to IDiscoveredFile array.
*/
private _sortFilesByDependency(
depGraph: DependencyGraph,
fileByPath: Map<string, IDiscoveredFile>,
): IDiscoveredFile[] {
const sortedPaths = depGraph.getSortedFiles();
this.warnings.push(...depGraph.getWarnings());
const sortedFiles: IDiscoveredFile[] = [];
for (const path of sortedPaths) {
const file = fileByPath.get(path);
Eif (file) {
sortedFiles.push(file);
}
}
return sortedFiles;
}
/**
* Stage 1: Discover source files
*
* Unified include resolution: Discovers .cnx files from inputs, then
* reads each file to extract and resolve its #include directives.
* This ensures headers are found based on what the source actually
* includes, not by blindly scanning include directories.
*/
private async discoverSources(): Promise<{
cnextFiles: IDiscoveredFile[];
headerFiles: IDiscoveredFile[];
}> {
// Step 1: Discover C-Next files from inputs (files or directories)
const cnextFiles: IDiscoveredFile[] = [];
const fileByPath = new Map<string, IDiscoveredFile>();
for (const input of this.config.inputs) {
this._discoverCNextFromInput(input, cnextFiles, fileByPath);
}
if (cnextFiles.length === 0) {
return { cnextFiles: [], headerFiles: [] };
}
// Step 2: For each C-Next file, resolve its #include directives
const headerSet = new Map<string, IDiscoveredFile>();
const depGraph = new DependencyGraph();
const cnextBaseNames = new Set(
cnextFiles.map((f) => basename(f.path).replace(/\.cnx$|\.cnext$/, "")),
);
for (const cnxFile of cnextFiles) {
this._processFileIncludes(
cnxFile,
depGraph,
cnextFiles,
cnextBaseNames,
headerSet,
fileByPath,
);
}
// Issue #580: Sort files topologically for correct cross-file const inference
const sortedCnextFiles = this._sortFilesByDependency(depGraph, fileByPath);
// Resolve headers transitively for the run() path
const { headers: allHeaders, warnings: headerWarnings } =
IncludeResolver.resolveHeadersTransitively(
[...headerSet.values()],
this.config.includeDirs,
{
onDebug: this.config.debugMode
? (msg) => console.log(`[DEBUG] ${msg}`)
: undefined,
processedPaths: this.state.getProcessedHeadersSet(),
fs: this.fs,
},
);
this.warnings.push(...headerWarnings);
return {
cnextFiles: sortedCnextFiles,
headerFiles: allHeaders,
};
}
// ===========================================================================
// Header Symbol Collection
// ===========================================================================
/**
* Stage 2: Collect symbols from a single C/C++ header
* Issue #592: Recursive include processing moved to IncludeResolver.resolveHeadersTransitively()
* SonarCloud S3776: Refactored to use helper methods for reduced complexity.
*/
private doCollectHeaderSymbols(file: IDiscoveredFile): void {
// Track as processed (for cycle detection)
const absolutePath = resolve(file.path);
this.state.markHeaderProcessed(absolutePath);
// Check cache first
if (this.tryRestoreFromCache(file)) {
return; // Cache hit - skip full parsing
}
// Read content and parse
const content = this.fs.readFile(file.path);
this.parseHeaderFile(file, content);
// Debug: Show symbols found
if (this.config.debugMode) {
const symbols = this.symbolTable.getSymbolsByFile(file.path);
console.log(`[DEBUG] Found ${symbols.length} symbols in ${file.path}`);
}
// Issue #590: Cache the results using simplified API
if (this.cacheManager) {
this.cacheManager.setSymbolsFromTable(file.path, this.symbolTable);
}
}
/**
* Try to restore symbols from cache. Returns true if cache hit.
* SonarCloud S3776: Extracted from doCollectHeaderSymbols().
*/
private tryRestoreFromCache(file: IDiscoveredFile): boolean {
if (!this.cacheManager?.isValid(file.path)) {
return false;
}
const cached = this.cacheManager.getSymbols(file.path);
Iif (!cached) {
return false;
}
// Restore symbols, struct fields, needsStructKeyword, and enumBitWidth from cache
this.symbolTable.addSymbols(cached.symbols);
this.symbolTable.restoreStructFields(cached.structFields);
this.symbolTable.restoreNeedsStructKeyword(cached.needsStructKeyword);
this.symbolTable.restoreEnumBitWidths(cached.enumBitWidth);
// Issue #211: Still check for C++ syntax even on cache hit
this.detectCppFromFileType(file);
return true;
}
/**
* Detect C++ mode based on file type and content.
* SonarCloud S3776: Extracted from doCollectHeaderSymbols().
*/
private detectCppFromFileType(file: IDiscoveredFile): void {
if (file.type === EFileType.CppHeader) {
// .hpp files are always C++
this.cppDetected = true;
return;
}
Eif (file.type === EFileType.CHeader) {
const content = this.fs.readFile(file.path);
if (detectCppSyntax(content)) {
this.cppDetected = true;
}
}
}
/**
* Parse a header file based on its type.
* SonarCloud S3776: Extracted from doCollectHeaderSymbols().
*/
private parseHeaderFile(file: IDiscoveredFile, content: string): void {
if (file.type === EFileType.CHeader) {
if (this.config.debugMode) {
console.log(`[DEBUG] Parsing C header: ${file.path}`);
}
this.parseCHeader(content, file.path);
return;
}
Eif (file.type === EFileType.CppHeader) {
// Issue #211: .hpp files are always C++
this.cppDetected = true;
if (this.config.debugMode) {
console.log(`[DEBUG] Parsing C++ header: ${file.path}`);
}
this.parseCppHeader(content, file.path);
}
}
/**
* Issue #208: Parse a C header using single-parser strategy
* Uses heuristic detection to choose the appropriate parser
*/
private parseCHeader(content: string, filePath: string): void {
if (detectCppSyntax(content)) {
// Issue #211: C++ detected, set flag for .cpp output
this.cppDetected = true;
// Use C++14 parser for headers with C++ syntax (typed enums, classes, etc.)
this.parseCppHeader(content, filePath);
} else {
// Use C parser for pure C headers
this.parsePureCHeader(content, filePath);
}
}
/**
* Issue #208: Parse a pure C header (no C++ syntax detected)
*/
private parsePureCHeader(content: string, filePath: string): void {
const { tree } = HeaderParser.parseC(content);
Eif (tree) {
const collector = new CSymbolCollector(filePath, this.symbolTable);
const symbols = collector.collect(tree);
if (symbols.length > 0) {
this.symbolTable.addSymbols(symbols);
}
}
}
/**
* Parse a C++ header
*/
private parseCppHeader(content: string, filePath: string): void {
const { tree } = HeaderParser.parseCpp(content);
Eif (tree) {
const collector = new CppSymbolCollector(filePath, this.symbolTable);
const symbols = collector.collect(tree);
this.symbolTable.addSymbols(symbols);
}
}
// ===========================================================================
// Code Generation Helpers
// ===========================================================================
/**
* Stage 6: Generate header file for a C-Next file
*/
private generateHeader(file: IDiscoveredFile): string | null {
const symbols = this.symbolTable.getSymbolsByFile(file.path);
const exportedSymbols = symbols.filter((s) => s.isExported);
if (exportedSymbols.length === 0) {
return null;
}
const headerName = basename(file.path).replace(/\.cnx$|\.cnext$/, ".h");
const headerPath = this.pathResolver.getHeaderOutputPath(file);
// Issue #220: Get SymbolCollector for full type definitions
const typeInput = this.state.getSymbolInfo(file.path);
// Issue #280: Get pass-by-value params from per-file storage for multi-file consistency
// This uses the snapshot taken during transpilation, not the current (stale) codeGenerator state.
// Fallback to empty map if not found (defensive - should always exist after transpilation).
const passByValueParams =
this.state.getPassByValueParams(file.path) ??
new Map<string, Set<string>>();
// Issue #424: Get user includes for header generation
const userIncludes = this.state.getUserIncludes(file.path);
// Issue #478, #588: Collect all known enum names from all files for cross-file type handling
const allKnownEnums = TransitiveEnumCollector.aggregateKnownEnums(
this.state.getAllSymbolInfo(),
);
// Issue #497: Build mapping from external types to their C header includes
const externalTypeHeaders = ExternalTypeHeaderBuilder.build(
this.state.getAllHeaderDirectives(),
this.symbolTable,
);
// Issue #502: Include symbolTable in typeInput for C++ namespace type detection
const typeInputWithSymbolTable = typeInput
? { ...typeInput, symbolTable: this.symbolTable }
: undefined;
const headerContent = this.headerGenerator.generate(
exportedSymbols,
headerName,
{
exportedOnly: true,
userIncludes,
externalTypeHeaders,
cppMode: this.cppDetected,
},
typeInputWithSymbolTable,
passByValueParams,
allKnownEnums,
);
this.fs.writeFile(headerPath, headerContent);
return headerPath;
}
/**
* Collect external enum sources from included C-Next files.
*/
private _collectExternalEnumSources(
sourcePath: string,
cnextIncludes?: ReadonlyArray<{ path: string }>,
): ICodeGenSymbols[] {
const symbolInfoByFile = this.state.getSymbolInfoByFileMap();
if (cnextIncludes) {
// Standalone mode: use unified collectForStandalone method
return TransitiveEnumCollector.collectForStandalone(
cnextIncludes,
symbolInfoByFile,
this.config.includeDirs,
);
}
// run() mode: use TransitiveEnumCollector with pre-populated symbolInfoByFile
return TransitiveEnumCollector.collect(
sourcePath,
symbolInfoByFile,
this.config.includeDirs,
);
}
/**
* Setup cross-file modification tracking for const inference.
*/
private _setupCrossFileModifications(): void {
const accumulatedModifications =
this.modificationAnalyzer.getModifications();
const accumulatedParamLists = this.modificationAnalyzer.getParamLists();
if (this.cppDetected && accumulatedModifications.size > 0) {
this.codeGenerator.setCrossFileModifications(
accumulatedModifications,
accumulatedParamLists,
);
}
}
/**
* Generate header content for exported symbols.
* Issue #591: Extracted from transpileSource() for reduced complexity.
*/
private generateHeaderContent(
symbols: ISymbol[],
sourcePath: string,
symbolTable: SymbolTable,
cppMode: boolean,
userIncludes: string[],
passByValueParams: Map<string, Set<string>>,
symbolInfo: ICodeGenSymbols,
): string | undefined {
const exportedSymbols = symbols.filter(
(s: { isExported?: boolean }) => s.isExported,
);
if (exportedSymbols.length === 0) {
return undefined;
}
const headerName = basename(sourcePath).replace(/\.cnx$|\.cnext$/, ".h");
// Get type input from CodeGenState (for struct/enum definitions)
const typeInput = CodeGenState.symbols;
// Update auto-const info on symbol parameters
const unmodifiedParams = this.codeGenerator.getFunctionUnmodifiedParams();
for (const symbol of symbols) {
if (symbol.kind !== ESymbolKind.Function || !symbol.parameters) {
continue;
}
const unmodified = unmodifiedParams.get(symbol.name);
Iif (!unmodified) continue;
for (const param of symbol.parameters) {
const isPointerParam =
!param.isConst &&
!param.isArray &&
param.type !== "f32" &&
param.type !== "f64" &&
param.type !== "ISR";
if (isPointerParam && unmodified.has(param.name)) {
param.isAutoConst = true;
}
}
}
// Issue #497: Build mapping from external types to their C header includes
const externalTypeHeaders = ExternalTypeHeaderBuilder.build(
this.state.getAllHeaderDirectives(),
symbolTable,
);
// Issue #502: Include symbolTable in typeInput for C++ namespace type detection
const typeInputWithSymbolTable = typeInput
? { ...typeInput, symbolTable }
: undefined;
// Issue #478: Pass all known enums for cross-file type handling
return this.headerGenerator.generate(
exportedSymbols,
headerName,
{
exportedOnly: true,
userIncludes,
externalTypeHeaders,
cppMode,
},
typeInputWithSymbolTable,
passByValueParams,
symbolInfo.knownEnums,
);
}
// ===========================================================================
// Result Builder Helpers
// ===========================================================================
/**
* Build an error result for parse/analyzer failures.
*/
private buildErrorResult(
sourcePath: string,
errors: IFileResult["errors"],
declarationCount: number,
): IFileResult {
return {
sourcePath,
code: "",
success: false,
errors,
declarationCount,
};
}
/**
* Build a result for parse-only mode.
*/
private buildParseOnlyResult(
sourcePath: string,
declarationCount: number,
): IFileResult {
return {
sourcePath,
code: "",
success: true,
errors: [],
declarationCount,
};
}
/**
* Build a successful transpilation result.
*/
private buildSuccessResult(
sourcePath: string,
code: string,
headerCode: string | undefined,
declarationCount: number,
): IFileResult {
return {
sourcePath,
code,
headerCode,
success: true,
errors: [],
declarationCount,
};
}
/**
* Build a catch/exception result.
*/
private buildCatchResult(sourcePath: string, err: unknown): IFileResult {
const rawMessage = err instanceof Error ? err.message : String(err);
const parsed = ParserUtils.parseErrorLocation(rawMessage);
return {
sourcePath,
code: "",
success: false,
errors: [
{
line: parsed.line,
column: parsed.column,
message: `Code generation failed: ${parsed.message}`,
severity: "error",
},
],
declarationCount: 0,
};
}
// ===========================================================================
// Public Accessors
// ===========================================================================
/**
* Get the symbol table (for testing/inspection)
*/
getSymbolTable(): SymbolTable {
return this.symbolTable;
}
/**
* Check if C++ output was detected during transpilation.
* This is set when C++ syntax is found in included headers (e.g., Arduino.h).
*/
isCppDetected(): boolean {
return this.cppDetected;
}
/**
* Determine the project root by walking up from the first input looking for
* project markers. Returns undefined if no project root can be established,
* which disables caching to avoid polluting the filesystem with .cnx directories.
*/
private determineProjectRoot(): string | undefined {
// Start from first input
const firstInput = this.config.inputs[0];
if (!firstInput) {
return undefined;
}
const resolvedInput = resolve(firstInput);
let startDir: string;
// Determine starting directory based on whether input exists
if (this.fs.exists(resolvedInput)) {
// Input exists - use its directory if file, or itself if directory
startDir = this.fs.isFile(resolvedInput)
? dirname(resolvedInput)
: resolvedInput;
} else {
// Input doesn't exist - assume it's a file path, use parent directory
startDir = dirname(resolvedInput);
}
// Project root indicators (in priority order)
const projectMarkers = [
"cnext.config.json", // C-Next config file
"platformio.ini", // PlatformIO project
".git", // Git repository root
"package.json", // Node.js project
];
// Walk up looking for project markers
let dir = startDir;
while (true) {
// Check each project marker
for (const marker of projectMarkers) {
const markerPath = join(dir, marker);
if (this.fs.exists(markerPath)) {
return dir;
}
}
// Move to parent directory
const parent = dirname(dir);
if (parent === dir) {
// Reached filesystem root without finding project markers
break;
}
dir = parent;
}
// No project root found - return undefined to disable caching
return undefined;
}
}
export default Transpiler;
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