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#!/usr/bin/env python3
import argparse
import os
import re
import subprocess
import sys
# Parse arguments
parser = argparse.ArgumentParser(
description="Generate a std compatibility module"
)
parser.add_argument("--src", help=(
"Specify the location of the rust source code. The default is "
"`$(rustc --print sysroot)/lib/rustlib/src/rust/src`"
))
args = parser.parse_args()
if args.src is None:
output = subprocess.run(["rustc", "--print", "sysroot"],
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
args.src = os.path.join(output.stdout.decode("utf-8").strip(),
"lib", "rustlib", "src", "rust", "src")
# Read files
modules_regex = re.compile(
r"^(?:\S.*)?pub\s+(?:mod\s+|use\s+(?:[a-zA-Z_][a-zA-Z0-9_]*::)*)"
r"([a-zA-Z_][a-zA-Z0-9_]*);",
re.MULTILINE
)
def modules(crate):
root = os.path.join(args.src, crate)
lib = os.path.join(root, "lib.rs")
with open(lib) as f:
contents = f.read()
modules = dict()
for match in modules_regex.finditer(contents):
module = match.group(1)
unstable = False
path = os.path.join(root, module + ".rs")
if not os.path.isfile(path):
path = os.path.join(root, module, "mod.rs")
try:
with open(path, "r") as f:
unstable = "#![unstable" in f.read()
if unstable:
print(
f"Module '{module}' from '{crate}' appears unstable",
file=sys.stderr
)
except OSError:
pass
modules[module] = unstable
return modules
def generate(module, unstable, *namespaces):
out = f"pub mod {module} {{\n"
if module == "prelude":
return None
for namespace in namespaces:
out += " "
cfgs = []
if namespace != "core":
cfgs.append(f"feature = \"{namespace}\"")
if unstable:
cfgs.append("feature = \"unstable\"")
if len(cfgs) == 1:
out += f"#[cfg({cfgs[0]})] "
elif len(cfgs) > 1:
out += "#[cfg(all(" + ", ".join(cfgs) + "))] "
out += f"pub use __{namespace}::{module}::*;\n"
if module == "collections":
prefix = (
" #[cfg(all("
"feature = \"alloc\", "
"feature = \"compat_hash\""
"))] pub use hashbrown::"
)
out += (
prefix + "HashMap;\n" +
prefix + "HashSet;\n"
)
elif module == "sync":
prefix = (
" #[cfg(all("
"feature = \"alloc\", "
"feature = \"compat_sync\""
"))] pub use spin::"
)
out += (
prefix + "Mutex;\n" +
prefix + "MutexGuard;\n" +
prefix + "Once;\n" +
prefix + "RwLock;\n" +
prefix + "RwLockReadGuard;\n" +
prefix + "RwLockWriteGuard;\n"
)
out += "}"
return out
core = modules("libcore")
alloc = modules("liballoc")
generated = {}
core_keys = set(core.keys())
alloc_keys = set(alloc.keys())
for module in core_keys & alloc_keys:
# TODO: separate these
unstable = core[module] or alloc[module]
generated[module] = generate(module, unstable, "core", "alloc")
for module in core_keys - alloc_keys:
unstable = core[module]
generated[module] = generate(module, unstable, "core")
for module in alloc_keys - core_keys:
unstable = alloc[module]
generated[module] = generate(module, unstable, "alloc")
generated["prelude"] = """pub mod prelude {
pub mod v1 {
// Prelude
pub use __core::prelude::v1::*;
#[cfg(all(feature = "alloc", feature = "unstable"))]
pub use __alloc::prelude::v1::*;
#[cfg(all(feature = "alloc", not(feature = "unstable")))]
pub use __alloc::{
borrow::ToOwned,
boxed::Box,
// UNSTABLE: slice::SliceConcatExt,
string::String,
string::ToString,
vec::Vec,
};
// Other imports
#[cfg(feature = "alloc")]
pub use __alloc::{format, vec};
#[cfg(feature = "compat_macros")]
pub use crate::{print, println, eprint, eprintln, dbg};
}
}"""
print("""//! Generated by generate.py located at the repository root
//! ./generate.py > src/generated.rs""")
for module in sorted(generated.items(), key=lambda i: i[0]):
print(module[1])
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