Add C++ modules support (#2291)

* Add C++ modules support * Add module examples * Missing semicolon * Update GitHub Actions script and create a modules updating script * Name the unused param * Use the guarded/direct export of header approach * Update CMakeLists.txt Co-authored-by: Andrea Pappacoda <andrea@pappacoda.it> * Update CMakeLists.txt Co-authored-by: Andrea Pappacoda <andrea@pappacoda.it> * Split scripts into split.py and generate_module.py --------- Co-authored-by: Andrea Pappacoda <andrea@pappacoda.it>
2026-04-11 19:28:30 +00:00 · 2026-02-02 11:27:09 -05:00
parent 6be32a540d
commit 1942e0ef01
4 changed files with 156 additions and 14 deletions
--- a/generate_module.py
+++ b/generate_module.py
@@ -0,0 +1,77 @@
+#!/usr/bin/env python3
+
+"""This script generates httplib.cppm module file from httplib.h."""
+
+import os
+import sys
+from argparse import ArgumentParser, Namespace
+from typing import List
+
+def main() -> None:
+    """Main entry point for the script."""
+
+    args_parser: ArgumentParser = ArgumentParser(description=__doc__)
+    args_parser.add_argument(
+        "-o", "--out", help="where to write the files (default: out)", default="out"
+    )
+    args: Namespace = args_parser.parse_args()
+
+    cur_dir: str = os.path.dirname(sys.argv[0])
+    if not cur_dir:
+        cur_dir = '.'
+    lib_name: str = "httplib"
+    header_name: str = f"/{lib_name}.h"
+    # get the input file
+    in_file: str = f"{cur_dir}{header_name}"
+    # get the output file
+    cppm_out: str = f"{args.out}/{lib_name}.cppm"
+
+    # if the modification time of the out file is after the in file,
+    # don't generate (as it is already finished)
+    do_generate: bool = True
+
+    if os.path.exists(cppm_out):
+        in_time: float = os.path.getmtime(in_file)
+        out_time: float = os.path.getmtime(cppm_out)
+        do_generate: bool = in_time > out_time
+
+    if do_generate:
+        with open(in_file) as f:
+            lines: List[str] = f.readlines()
+
+        os.makedirs(args.out, exist_ok=True)
+
+        # Find the Headers and Declaration comment markers
+        headers_start: int = -1
+        declaration_start: int = -1
+        for i, line in enumerate(lines):
+            if ' * Headers' in line:
+                headers_start = i - 1  # Include the /* line
+            elif ' * Declaration' in line:
+                declaration_start = i - 1  # Stop before the /* line
+                break
+
+        with open(cppm_out, 'w') as fm:
+            # Write module file
+            fm.write("module;\n\n")
+            
+            # Write global module fragment (from Headers to Declaration comment)
+            # Filter out 'using' declarations to avoid conflicts
+            if headers_start >= 0 and declaration_start >= 0:
+                for i in range(headers_start, declaration_start):
+                    line: str = lines[i]
+                    if 'using' not in line:
+                        fm.write(line)
+            
+            fm.write("\nexport module httplib;\n\n")
+            fm.write("export extern \"C++\" {\n")
+            fm.write(f"{' ' * 4}#include \"httplib.h\"\n")
+            fm.write("}\n")
+
+        print(f"Wrote {cppm_out}")
+    else:
+        print(f"{cppm_out} is up to date")
+
+
+if __name__ == "__main__":
+    main()