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macro: add export macro, support renaming xs functions

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Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
This commit is contained in:
Wolfgang Bumiller 2020-01-10 09:58:07 +01:00
parent 52f7cd49f1
commit abdf721d90
2 changed files with 137 additions and 63 deletions
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85
perlmod-macro/src/attribs.rs Normal file
View File

@ -0,0 +1,85 @@
use std::convert::TryFrom;
use proc_macro2::{Ident, Span};
use syn::AttributeArgs;
pub struct ModuleAttrs {
pub package_name: String,
pub file_name: String,
pub lib_name: Option<String>,
}
impl TryFrom<AttributeArgs> for ModuleAttrs {
type Error = syn::Error;
fn try_from(args: AttributeArgs) -> Result<Self, Self::Error> {
let mut package_name = None;
let mut file_name = None;
let mut lib_name = None;
for arg in args {
match arg {
syn::NestedMeta::Meta(syn::Meta::NameValue(syn::MetaNameValue {
path,
eq_token: _,
lit: syn::Lit::Str(litstr),
})) => {
if path.is_ident("name") {
package_name = Some(litstr.value());
} else if path.is_ident("file") {
file_name = Some(litstr.value());
} else if path.is_ident("lib") {
lib_name = Some(litstr.value());
} else {
bail!(path => "unknown argument");
}
}
_ => bail!(Span::call_site(), "unexpected attribute argument"),
}
}
let package_name = package_name
.ok_or_else(|| format_err!(Span::call_site(), "missing 'package' argument"))?;
let file_name =
file_name.unwrap_or_else(|| format!("{}.pm", package_name.replace("::", "/")));
Ok(Self {
package_name,
file_name,
lib_name,
})
}
}
pub struct FunctionAttrs {
pub xs_name: Option<Ident>,
}
impl TryFrom<AttributeArgs> for FunctionAttrs {
type Error = syn::Error;
fn try_from(args: AttributeArgs) -> Result<Self, Self::Error> {
let mut xs_name = None;
for arg in args {
match arg {
syn::NestedMeta::Meta(syn::Meta::NameValue(syn::MetaNameValue {
path,
eq_token: _,
lit: syn::Lit::Str(litstr),
})) => {
if path.is_ident("name") {
xs_name = Some(Ident::new(&litstr.value(), litstr.span()));
} else {
bail!(path => "unknown argument");
}
}
_ => bail!(Span::call_site(), "unexpected attribute argument"),
}
}
Ok(Self { xs_name })
}
}

115
perlmod-macro/src/lib.rs
View File

@ -2,15 +2,18 @@ extern crate proc_macro;
extern crate proc_macro2;
use std::convert::TryFrom;
use std::iter::IntoIterator;
use failure::Error;
use proc_macro::TokenStream as TokenStream_1;
use proc_macro2::{Ident, Span, TokenStream};
use proc_macro2::{Ident, TokenStream};
use quote::quote;
use syn::parse::Parser;
use syn::parse_macro_input;
use syn::AttributeArgs;
use syn::punctuated::Punctuated;
use syn::{AttributeArgs, Token};
macro_rules! format_err {
($span:expr => $($msg:tt)*) => { syn::Error::new_spanned($span, format!($($msg)*)) };
@ -22,6 +25,8 @@ macro_rules! bail {
($span:expr, $($msg:tt)*) => { return Err(format_err!($span, $($msg)*).into()) };
}
mod attribs;
fn handle_error(mut item: TokenStream, data: Result<TokenStream, Error>) -> TokenStream {
match data {
Ok(output) => output,
@ -41,7 +46,7 @@ struct XSub {
tokens: TokenStream,
}
/// Macro for exporting rust functions as perl xsubs.
/// Macro for starting a perl "package".
#[proc_macro_attribute]
pub fn package(attr: TokenStream_1, item: TokenStream_1) -> TokenStream_1 {
let attr = parse_macro_input!(attr as AttributeArgs);
@ -49,20 +54,33 @@ pub fn package(attr: TokenStream_1, item: TokenStream_1) -> TokenStream_1 {
handle_error(item.clone(), perlmod_impl(attr, item)).into()
}
/// Macro to generate an exported xsub for a function.
#[proc_macro_attribute]
pub fn export(attr: TokenStream_1, item: TokenStream_1) -> TokenStream_1 {
let attr = parse_macro_input!(attr as AttributeArgs);
let item: TokenStream = item.into();
handle_error(item.clone(), export_impl(attr, item)).into()
}
fn perlmod_impl(attr: AttributeArgs, item: TokenStream) -> Result<TokenStream, Error> {
let item: syn::Item = syn::parse2(item)?;
match item {
syn::Item::Fn(func) => {
let func = handle_function(func)?;
Ok(func.tokens)
}
syn::Item::Fn(func) => bail!(func => "did you mean to use the 'export' macro?"),
syn::Item::Mod(module) => handle_module(attr, module),
_ => bail!(item => "expected module or function"),
}
}
fn handle_function(func: syn::ItemFn) -> Result<XSub, Error> {
fn export_impl(attr: AttributeArgs, item: TokenStream) -> Result<TokenStream, Error> {
let func: syn::ItemFn = syn::parse2(item)?;
let attr = attribs::FunctionAttrs::try_from(attr)?;
let func = handle_function(attr, func)?;
Ok(func.tokens)
}
fn handle_function(attr: attribs::FunctionAttrs, func: syn::ItemFn) -> Result<XSub, Error> {
//let vis = core::mem::replace(&mut func.vis, syn::Visibility::Inherited);
//if let syn::Visibility::Public(_) = vis {
// // ok
@ -80,7 +98,9 @@ fn handle_function(func: syn::ItemFn) -> Result<XSub, Error> {
}
let name = &sig.ident;
let xs_name = Ident::new(&format!("xs_{}", name), name.span());
let xs_name = attr
.xs_name
.unwrap_or_else(|| Ident::new(&format!("xs_{}", name), name.span()));
let impl_xs_name = Ident::new(&format!("impl_xs_{}", name), name.span());
let mut extract_arguments = TokenStream::new();
@ -235,57 +255,8 @@ BEGIN {
const MODULE_TAIL: &str = "}\n";
struct ModuleArgs {
package_name: String,
file_name: String,
lib_name: Option<String>,
}
impl TryFrom<AttributeArgs> for ModuleArgs {
type Error = syn::Error;
fn try_from(args: AttributeArgs) -> Result<Self, Self::Error> {
let mut package_name = None;
let mut file_name = None;
let mut lib_name = None;
for arg in args {
match arg {
syn::NestedMeta::Meta(syn::Meta::NameValue(syn::MetaNameValue {
path,
eq_token: _,
lit: syn::Lit::Str(litstr),
})) => {
if path.is_ident("name") {
package_name = Some(litstr.value());
} else if path.is_ident("file") {
file_name = Some(litstr.value());
} else if path.is_ident("lib") {
lib_name = Some(litstr.value());
} else {
bail!(path => "unknown argument");
}
}
_ => bail!(Span::call_site(), "unexpected attribute argument"),
}
}
let package_name = package_name
.ok_or_else(|| format_err!(Span::call_site(), "missing 'package' argument"))?;
let file_name =
file_name.unwrap_or_else(|| format!("{}.pm", package_name.replace("::", "/")));
Ok(Self {
package_name,
file_name,
lib_name,
})
}
}
fn handle_module(attr: AttributeArgs, mut module: syn::ItemMod) -> Result<TokenStream, Error> {
let args = ModuleArgs::try_from(attr)?;
let args = attribs::ModuleAttrs::try_from(attr)?;
let mut module_source = format!("package {};\n{}", args.package_name, MODULE_HEAD);
@ -293,11 +264,29 @@ fn handle_module(attr: AttributeArgs, mut module: syn::ItemMod) -> Result<TokenS
for item in items.iter_mut() {
match core::mem::replace(item, syn::Item::Verbatim(TokenStream::new())) {
syn::Item::Fn(mut func) => {
let count = func.attrs.len();
func.attrs.retain(|attr| !attr.path.is_ident("export"));
let mut attribs = None;
for attr in std::mem::replace(&mut func.attrs, Default::default()) {
if attr.path.is_ident("export") {
if attribs.is_some() {
bail!(attr => "multiple 'export' attributes not allowed");
}
let args: AttributeArgs =
Punctuated::<syn::NestedMeta, Token![,]>::parse_terminated
.parse2(attr.tokens)?
.into_iter()
.collect();
attribs = Some(attribs::FunctionAttrs::try_from(args)?);
} else {
// retain the attribute
func.attrs.push(attr);
}
}
// if we removed an #[export] macro this is an exported function:
if count != func.attrs.len() {
let func = handle_function(func)?;
if let Some(attribs) = attribs {
let func = handle_function(attribs, func)?;
*item = syn::Item::Verbatim(func.tokens);
module_source = format!(
"{} newXS('{}', '{}', 'src/FIXME.rs');\n",