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Major refactor of attribute handling

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This commit is contained in:
J Henry Waugh 2020-08-23 17:53:30 -05:00
parent 9fe3672514
commit 5498443517
6 changed files with 363 additions and 307 deletions
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117
codegen/src/attrs.rs Normal file
View File

@ -0,0 +1,117 @@
use syn::{parse::ParseStream, parse::Parser, spanned::Spanned};
pub trait ExportedParams: Sized {
fn parse_stream(args: ParseStream) -> syn::Result<Self>;
fn no_attrs() -> Self;
fn from_info(info: ExportInfo) -> syn::Result<Self>;
}
pub struct AttrItem {
pub key: proc_macro2::Ident,
pub value: Option<syn::LitStr>,
}
pub struct ExportInfo {
pub item_span: proc_macro2::Span,
pub items: Vec<AttrItem>,
}
pub fn parse_attr_items(args: ParseStream) -> syn::Result<ExportInfo> {
if args.is_empty() {
return Ok(ExportInfo { item_span: args.span(), items: Vec::new()});
}
let arg_list = args
.call(syn::punctuated::Punctuated::<syn::Expr, syn::Token![,]>::parse_separated_nonempty)?;
parse_punctuated_items(arg_list)
}
pub fn parse_punctuated_items(
arg_list: syn::punctuated::Punctuated<syn::Expr, syn::Token![,]>,
) -> syn::Result<ExportInfo> {
let list_span = arg_list.span();
let mut attrs: Vec<AttrItem> = Vec::new();
for arg in arg_list {
let (key, value) = match arg {
syn::Expr::Assign(syn::ExprAssign {
ref left,
ref right,
..
}) => {
let attr_name: syn::Ident = match left.as_ref() {
syn::Expr::Path(syn::ExprPath {
path: attr_path, ..
}) => attr_path.get_ident().cloned().ok_or_else(|| {
syn::Error::new(attr_path.span(), "expecting attribute name")
})?,
x => return Err(syn::Error::new(x.span(), "expecting attribute name")),
};
let attr_value = match right.as_ref() {
syn::Expr::Lit(syn::ExprLit {
lit: syn::Lit::Str(string),
..
}) => string.clone(),
x => return Err(syn::Error::new(x.span(), "expecting string literal")),
};
(attr_name, Some(attr_value))
}
syn::Expr::Path(syn::ExprPath {
path: attr_path, ..
}) => attr_path
.get_ident()
.cloned()
.map(|a| (a, None))
.ok_or_else(|| syn::Error::new(attr_path.span(), "expecting attribute name"))?,
x => return Err(syn::Error::new(x.span(), "expecting identifier")),
};
attrs.push(AttrItem { key, value });
}
Ok(ExportInfo { item_span: list_span, items: attrs })
}
pub(crate) fn outer_item_attributes<T: ExportedParams>(
args: proc_macro2::TokenStream,
_attr_name: &str,
) -> syn::Result<T> {
if args.is_empty() {
return Ok(T::no_attrs());
}
let parser = syn::punctuated::Punctuated::<syn::Expr, syn::Token![,]>::parse_separated_nonempty;
let arg_list = parser.parse2(args)?;
let export_info = parse_punctuated_items(arg_list)?;
T::from_info(export_info)
}
pub(crate) fn inner_item_attributes<T: ExportedParams>(
attrs: &mut Vec<syn::Attribute>,
attr_name: &str,
) -> syn::Result<T> {
// Find the #[rhai_fn] attribute which will turn be read for the function parameters.
if let Some(rhai_fn_idx) = attrs
.iter()
.position(|a| a.path.get_ident().map(|i| *i == attr_name).unwrap_or(false))
{
let rhai_fn_attr = attrs.remove(rhai_fn_idx);
rhai_fn_attr.parse_args_with(T::parse_stream)
} else {
Ok(T::no_attrs())
}
}
pub(crate) fn deny_cfg_attr(attrs: &Vec<syn::Attribute>) -> syn::Result<()> {
if let Some(cfg_attr) = attrs
.iter()
.find(|a| a.path.get_ident().map(|i| *i == "cfg").unwrap_or(false))
{
Err(syn::Error::new(
cfg_attr.span(),
"cfg attributes not allowed on this item",
))
} else {
Ok(())
}
}

136
codegen/src/function.rs
View File

@ -10,11 +10,11 @@ use alloc::format;
#[cfg(not(no_std))]
use std::format;
use std::collections::HashMap;
use quote::{quote, quote_spanned};
use syn::{parse::Parse, parse::ParseStream, parse::Parser, spanned::Spanned};
use crate::attrs::{ExportInfo, ExportedParams};
#[derive(Debug, Default)]
pub(crate) struct ExportedFnParams {
pub name: Option<String>,
@ -23,14 +23,6 @@ pub(crate) struct ExportedFnParams {
pub span: Option<proc_macro2::Span>,
}
impl ExportedFnParams {
pub fn skip() -> ExportedFnParams {
let mut skip = ExportedFnParams::default();
skip.skip = true;
skip
}
}
pub const FN_IDX_GET: &str = "index$get$";
pub const FN_IDX_SET: &str = "index$set$";
@ -47,58 +39,44 @@ impl Parse for ExportedFnParams {
return Ok(ExportedFnParams::default());
}
let arg_list = args.call(
syn::punctuated::Punctuated::<syn::Expr, syn::Token![,]>::parse_separated_nonempty,
)?;
let span = arg_list.span();
let info = crate::attrs::parse_attr_items(args)?;
Self::from_info(info)
}
}
let mut attrs: HashMap<proc_macro2::Ident, Option<syn::LitStr>> = HashMap::new();
for arg in arg_list {
let (left, right) = match arg {
syn::Expr::Assign(syn::ExprAssign {
ref left,
ref right,
..
}) => {
let attr_name: syn::Ident = match left.as_ref() {
syn::Expr::Path(syn::ExprPath {
path: attr_path, ..
}) => attr_path.get_ident().cloned().ok_or_else(|| {
syn::Error::new(attr_path.span(), "expecting attribute name")
})?,
x => return Err(syn::Error::new(x.span(), "expecting attribute name")),
};
let attr_value = match right.as_ref() {
syn::Expr::Lit(syn::ExprLit {
lit: syn::Lit::Str(string),
..
}) => string.clone(),
x => return Err(syn::Error::new(x.span(), "expecting string literal")),
};
(attr_name, Some(attr_value))
}
syn::Expr::Path(syn::ExprPath {
path: attr_path, ..
}) => attr_path
.get_ident()
.cloned()
.map(|a| (a, None))
.ok_or_else(|| syn::Error::new(attr_path.span(), "expecting attribute name"))?,
x => return Err(syn::Error::new(x.span(), "expecting identifier")),
};
attrs.insert(left, right);
}
impl ExportedParams for ExportedFnParams {
fn parse_stream(args: ParseStream) -> syn::Result<Self> {
Self::parse(args)
}
fn no_attrs() -> Self {
Default::default()
}
fn from_info(
info: crate::attrs::ExportInfo,
) -> syn::Result<Self> {
let ExportInfo { item_span: span, items: attrs } = info;
let mut name = None;
let mut return_raw = false;
let mut skip = false;
for (ident, value) in attrs.drain() {
match (ident.to_string().as_ref(), value) {
("name", Some(s)) => name = Some(s.value()),
for attr in attrs {
let crate::attrs::AttrItem { key, value } = attr;
match (key.to_string().as_ref(), value) {
("name", Some(s)) => {
// check validity of name
if s.value().contains('.') {
return Err(syn::Error::new(
s.span(),
"Rhai function names may not contain dot",
));
}
name = Some(s.value())
}
("get", Some(s)) => name = Some(make_getter(&s.value())),
("set", Some(s)) => name = Some(make_setter(&s.value())),
("get", None) | ("set", None) | ("name", None) => {
return Err(syn::Error::new(ident.span(), "requires value"))
return Err(syn::Error::new(key.span(), "requires value"))
}
("index_get", None) => name = Some(FN_IDX_GET.to_string()),
("index_set", None) => name = Some(FN_IDX_SET.to_string()),
@ -110,21 +88,13 @@ impl Parse for ExportedFnParams {
("skip", Some(s)) => return Err(syn::Error::new(s.span(), "extraneous value")),
(attr, _) => {
return Err(syn::Error::new(
ident.span(),
key.span(),
format!("unknown attribute '{}'", attr),
))
}
}
}
// Check validity of name, if present.
if name.as_ref().filter(|n| n.contains('.')).is_some() {
return Err(syn::Error::new(
span,
"Rhai function names may not contain dot"
))
}
Ok(ExportedFnParams {
name,
return_raw,
@ -151,20 +121,10 @@ impl Parse for ExportedFn {
let str_type_path = syn::parse2::<syn::Path>(quote! { str }).unwrap();
// #[cfg] attributes are not allowed on functions due to what is generated for them
if let Some(cfg_attr) = fn_all.attrs.iter().find(|a| {
a.path
.get_ident()
.map(|i| i.to_string() == "cfg")
.unwrap_or(false)
}) {
return Err(syn::Error::new(cfg_attr.span(), "cfg attributes not allowed on this item"));
}
crate::attrs::deny_cfg_attr(&fn_all.attrs)?;
// Determine if the function is public.
let is_public = match fn_all.vis {
syn::Visibility::Public(_) => true,
_ => false,
};
let is_public = matches!(fn_all.vis, syn::Visibility::Public(_));
// Determine whether function generates a special calling convention for a mutable
// reciever.
let mut_receiver = {
@ -216,10 +176,7 @@ impl Parse for ExportedFn {
mutability: None,
ref elem,
..
}) => match elem.as_ref() {
&syn::Type::Path(ref p) if p.path == str_type_path => true,
_ => false,
},
}) => matches!(elem.as_ref(), &syn::Type::Path(ref p) if p.path == str_type_path),
&syn::Type::Verbatim(_) => false,
_ => true,
};
@ -293,17 +250,18 @@ impl ExportedFn {
}
}
pub fn set_params(
&mut self, mut params: ExportedFnParams,
) -> syn::Result<()> {
pub fn set_params(&mut self, mut params: ExportedFnParams) -> syn::Result<()> {
// Do not allow non-returning raw functions.
//
// This is caught now to avoid issues with diagnostics later.
if params.return_raw && mem::discriminant(&self.signature.output) ==
mem::discriminant(&syn::ReturnType::Default) {
return Err(syn::Error::new(self.signature.span(),
"return_raw functions must return Result<T>"));
if params.return_raw
&& mem::discriminant(&self.signature.output)
== mem::discriminant(&syn::ReturnType::Default)
{
return Err(syn::Error::new(
self.signature.span(),
"return_raw functions must return Result<T>",
));
}
self.params = params;
@ -618,7 +576,7 @@ mod function_tests {
&syn::parse2::<syn::FnArg>(quote! { x: usize }).unwrap()
);
assert_eq!(
item_fn.arg_list().skip(1).next().unwrap(),
item_fn.arg_list().nth(1).unwrap(),
&syn::parse2::<syn::FnArg>(quote! { y: f32 }).unwrap()
);
}
@ -739,7 +697,7 @@ mod function_tests {
&syn::parse2::<syn::FnArg>(quote! { level: usize }).unwrap()
);
assert_eq!(
item_fn.arg_list().skip(1).next().unwrap(),
item_fn.arg_list().nth(1).unwrap(),
&syn::parse2::<syn::FnArg>(quote! { message: &str }).unwrap()
);
}

6
codegen/src/lib.rs
View File

@ -96,6 +96,7 @@
use quote::quote;
use syn::parse_macro_input;
mod attrs;
mod function;
mod module;
mod register;
@ -108,7 +109,10 @@ pub fn export_fn(
) -> proc_macro::TokenStream {
let mut output = proc_macro2::TokenStream::from(input.clone());
let parsed_params = parse_macro_input!(args as function::ExportedFnParams);
let parsed_params = match crate::attrs::outer_item_attributes(args.into(), "export_fn") {
Ok(args) => args,
Err(err) => return proc_macro::TokenStream::from(err.to_compile_error()),
};
let mut function_def = parse_macro_input!(input as function::ExportedFn);
if let Err(e) = function_def.set_params(parsed_params) {
return e.to_compile_error().into();

321
codegen/src/module.rs
View File

@ -1,7 +1,7 @@
use quote::{quote, ToTokens};
use syn::{parse::Parse, parse::ParseStream, spanned::Spanned};
use syn::{parse::Parse, parse::ParseStream};
use crate::function::{ExportedFn, ExportedFnParams};
use crate::function::ExportedFn;
use crate::rhai_module::ExportedConst;
#[cfg(no_std)]
@ -15,92 +15,9 @@ use core::mem;
use std::mem;
use std::borrow::Cow;
use std::collections::HashMap;
fn inner_fn_attributes(f: &mut syn::ItemFn) -> syn::Result<ExportedFnParams> {
// #[cfg] attributes are not allowed on objects
if let Some(cfg_attr) = f.attrs.iter().find(|a| {
a.path
.get_ident()
.map(|i| i.to_string() == "cfg")
.unwrap_or(false)
}) {
return Err(syn::Error::new(cfg_attr.span(), "cfg attributes not allowed on this item"));
}
// Find the #[rhai_fn] attribute which will turn be read for the function parameters.
if let Some(rhai_fn_idx) = f.attrs.iter().position(|a| {
a.path
.get_ident()
.map(|i| i.to_string() == "rhai_fn")
.unwrap_or(false)
}) {
let rhai_fn_attr = f.attrs.remove(rhai_fn_idx);
rhai_fn_attr.parse_args()
} else if let syn::Visibility::Public(_) = f.vis {
Ok(ExportedFnParams::default())
} else {
Ok(ExportedFnParams::skip())
}
}
fn check_rename_collisions(fns: &Vec<ExportedFn>) -> Result<(), syn::Error> {
let mut renames = HashMap::<String, proc_macro2::Span>::new();
let mut names = HashMap::<String, proc_macro2::Span>::new();
for itemfn in fns.iter() {
if let Some(ref name) = itemfn.params.name {
let current_span = itemfn.params.span.as_ref().unwrap();
let key = itemfn.arg_list().fold(name.clone(), |mut argstr, fnarg| {
let type_string: String = match fnarg {
syn::FnArg::Receiver(_) => unimplemented!("receiver rhai_fns not implemented"),
syn::FnArg::Typed(syn::PatType { ref ty, .. }) =>
ty.as_ref().to_token_stream().to_string(),
};
argstr.push('.');
argstr.extend(type_string.chars());
argstr
});
if let Some(other_span) = renames.insert(key,
current_span.clone()) {
let mut err = syn::Error::new(current_span.clone(),
format!("duplicate Rhai signature for '{}'", &name));
err.combine(syn::Error::new(other_span,
format!("duplicated function renamed '{}'", &name)));
return Err(err);
}
} else {
let ident = itemfn.name();
names.insert(ident.to_string(), ident.span());
}
}
for (new_name, attr_span) in renames.drain() {
let new_name = new_name.split('.').next().unwrap();
if let Some(fn_span) = names.get(new_name) {
let mut err = syn::Error::new(attr_span,
format!("duplicate Rhai signature for '{}'", &new_name));
err.combine(syn::Error::new(fn_span.clone(),
format!("duplicated function '{}'", &new_name)));
return Err(err);
}
}
Ok(())
}
fn inner_mod_attributes(f: &mut syn::ItemMod) -> syn::Result<ExportedModParams> {
if let Some(rhai_mod_idx) = f.attrs.iter().position(|a| {
a.path
.get_ident()
.map(|i| i.to_string() == "rhai_mod")
.unwrap_or(false)
}) {
let rhai_mod_attr = f.attrs.remove(rhai_mod_idx);
rhai_mod_attr.parse_args()
} else if let syn::Visibility::Public(_) = f.vis {
Ok(ExportedModParams::default())
} else {
Ok(ExportedModParams::skip())
}
}
use crate::attrs::{AttrItem, ExportInfo, ExportedParams};
use crate::function::{ExportedFnParams};
#[derive(Debug, Default)]
pub(crate) struct ExportedModParams {
@ -108,81 +25,52 @@ pub(crate) struct ExportedModParams {
pub skip: bool,
}
impl ExportedModParams {
pub fn skip() -> ExportedModParams {
let mut skip = ExportedModParams::default();
skip.skip = true;
skip
}
}
impl Parse for ExportedModParams {
fn parse(args: ParseStream) -> syn::Result<Self> {
if args.is_empty() {
return Ok(ExportedModParams::default());
}
let arg_list = args.call(
syn::punctuated::Punctuated::<syn::Expr, syn::Token![,]>::parse_separated_nonempty,
)?;
let info = crate::attrs::parse_attr_items(args)?;
let mut attrs: HashMap<syn::Ident, Option<syn::LitStr>> = HashMap::new();
for arg in arg_list {
let (left, right) = match arg {
syn::Expr::Assign(syn::ExprAssign {
ref left,
ref right,
..
}) => {
let attr_name: syn::Ident = match left.as_ref() {
syn::Expr::Path(syn::ExprPath {
path: attr_path, ..
}) => attr_path.get_ident().cloned().ok_or_else(|| {
syn::Error::new(attr_path.span(), "expecting attribute name")
})?,
x => return Err(syn::Error::new(x.span(), "expecting attribute name")),
};
let attr_value = match right.as_ref() {
syn::Expr::Lit(syn::ExprLit {
lit: syn::Lit::Str(string),
..
}) => string.clone(),
x => return Err(syn::Error::new(x.span(), "expecting string literal")),
};
(attr_name, Some(attr_value))
}
syn::Expr::Path(syn::ExprPath {
path: attr_path, ..
}) => attr_path
.get_ident()
.cloned()
.map(|a| (a, None))
.ok_or_else(|| syn::Error::new(attr_path.span(), "expecting attribute name"))?,
x => return Err(syn::Error::new(x.span(), "expecting identifier")),
};
attrs.insert(left, right);
}
Self::from_info(info)
}
}
impl ExportedParams for ExportedModParams {
fn parse_stream(args: ParseStream) -> syn::Result<Self> {
Self::parse(args)
}
fn no_attrs() -> Self {
Default::default()
}
fn from_info(info: ExportInfo) -> syn::Result<Self> {
let ExportInfo { items: attrs, .. } = info;
let mut name = None;
let mut skip = false;
for (ident, value) in attrs.drain() {
match (ident.to_string().as_ref(), value) {
for attr in attrs {
let AttrItem { key, value } = attr;
match (key.to_string().as_ref(), value) {
("name", Some(s)) => name = Some(s.value()),
("name", None) => return Err(syn::Error::new(ident.span(), "requires value")),
("name", None) => return Err(syn::Error::new(key.span(), "requires value")),
("skip", None) => skip = true,
("skip", Some(s)) => {
return Err(syn::Error::new(s.span(), "extraneous value"))
}
("skip", Some(s)) => return Err(syn::Error::new(s.span(), "extraneous value")),
(attr, _) => {
return Err(syn::Error::new(
ident.span(),
key.span(),
format!("unknown attribute '{}'", attr),
))
}
}
}
Ok(ExportedModParams { name, skip, ..Default::default() })
Ok(ExportedModParams {
name,
skip,
..Default::default()
})
}
}
@ -209,17 +97,26 @@ impl Parse for Module {
syn::Item::Fn(f) => Some(f),
_ => None,
})
.try_fold(Vec::new(), |mut vec, mut itemfn| {
let params = match inner_fn_attributes(&mut itemfn) {
Ok(p) => p,
Err(e) => return Err(e),
.try_fold(Vec::new(), |mut vec, itemfn| {
// #[cfg] attributes are not allowed on functions
crate::attrs::deny_cfg_attr(&itemfn.attrs)?;
let mut params: ExportedFnParams =
match crate::attrs::inner_item_attributes(&mut itemfn.attrs, "rhai_fn") {
Ok(p) => p,
Err(e) => return Err(e),
};
params.skip = if let syn::Visibility::Public(_) = itemfn.vis {
params.skip
} else {
true
};
syn::parse2::<ExportedFn>(itemfn.to_token_stream())
.map(|mut f| {
f.params = params;
f
})
.map(|f| if !f.params.skip { vec.push(f) })
.map(|f| vec.push(f))
.map(|_| vec)
})?;
// Gather and parse constants definitions.
@ -233,23 +130,14 @@ impl Parse for Module {
..
}) => {
// #[cfg] attributes are not allowed on const declarations
if let Some(cfg_attr) = attrs.iter().find(|a| {
a.path
.get_ident()
.map(|i| i.to_string() == "cfg")
.unwrap_or(false)
}) {
return Err(syn::Error::new(
cfg_attr.span(),
"cfg attributes not allowed on this item"));
}
crate::attrs::deny_cfg_attr(&attrs)?;
if let syn::Visibility::Public(_) = vis {
consts.push((ident.to_string(), expr.as_ref().clone()));
}
},
_ => {},
}
_ => {}
}
};
}
// Gather and parse submodule definitions.
//
// They are actually removed from the module's body, because they will need
@ -257,23 +145,27 @@ impl Parse for Module {
submodules.reserve(content.len() - fns.len() - consts.len());
let mut i = 0;
while i < content.len() {
if let syn::Item::Mod(_) = &content[i] {
if let syn::Item::Mod(_) = &content[i] {
let mut itemmod = match content.remove(i) {
syn::Item::Mod(m) => m,
_ => unreachable!(),
};
let params = match inner_mod_attributes(&mut itemmod) {
Ok(p) => p,
Err(e) => return Err(e),
let mut params: ExportedModParams =
match crate::attrs::inner_item_attributes(&mut itemmod.attrs, "rhai_mod") {
Ok(p) => p,
Err(e) => return Err(e),
};
params.skip = if let syn::Visibility::Public(_) = itemmod.vis {
params.skip
} else {
true
};
let module = syn::parse2::<Module>(itemmod.to_token_stream())
.map(|mut f| {
let module =
syn::parse2::<Module>(itemmod.to_token_stream()).map(|mut f| {
f.params = params;
f
})?;
if !module.params.skip {
submodules.push(module);
}
submodules.push(module);
} else {
i += 1;
}
@ -308,6 +200,10 @@ impl Module {
}
}
pub fn skipped(&self) -> bool {
self.params.skip
}
pub fn generate(self) -> proc_macro2::TokenStream {
match self.generate_inner() {
Ok(tokens) => tokens,
@ -315,39 +211,55 @@ impl Module {
}
}
fn generate_inner(mut self) -> Result<proc_macro2::TokenStream, syn::Error> {
fn generate_inner(self) -> Result<proc_macro2::TokenStream, syn::Error> {
// Check for collisions if the "name" attribute was used on inner functions.
check_rename_collisions(&self.fns)?;
crate::rhai_module::check_rename_collisions(&self.fns)?;
// Generate new module items.
//
// This is done before inner module recursive generation, because that is destructive.
let mod_gen = crate::rhai_module::generate_body(&self.fns, &self.consts, &self.submodules);
// NB: submodules must have their new items for exporting generated in depth-first order to
// avoid issues with reparsing them.
let inner_modules: Vec<proc_macro2::TokenStream> = self.submodules.drain(..)
.try_fold::<Vec<proc_macro2::TokenStream>, _,
Result<Vec<proc_macro2::TokenStream>, syn::Error>>(
Vec::new(), |mut acc, m| { acc.push(m.generate_inner()?); Ok(acc) })?;
// Generate new module items for exporting functions and constant.
// Rebuild the structure of the module, with the new content added.
let Module { mod_all, .. } = self;
// Extract the current structure of the module.
let Module {
mod_all,
fns,
consts,
mut submodules,
params,
..
} = self;
let mut mod_all = mod_all.unwrap();
let mod_name = mod_all.ident.clone();
let (_, orig_content) = mod_all.content.take().unwrap();
let mod_attrs = mem::replace(&mut mod_all.attrs, Vec::with_capacity(0));
Ok(quote! {
#(#mod_attrs)*
pub mod #mod_name {
#(#orig_content)*
#(#inner_modules)*
#mod_gen
}
})
if !params.skip {
// Generate new module items.
//
// This is done before inner module recursive generation, because that is destructive.
let mod_gen = crate::rhai_module::generate_body(&fns, &consts, &submodules);
// NB: submodules must have their new items for exporting generated in depth-first order
// to avoid issues caused by re-parsing them
let inner_modules: Vec<proc_macro2::TokenStream> = submodules.drain(..)
.try_fold::<Vec<proc_macro2::TokenStream>, _,
Result<Vec<proc_macro2::TokenStream>, syn::Error>>(
Vec::new(), |mut acc, m| { acc.push(m.generate_inner()?); Ok(acc) })?;
// Regenerate the module with the new content added.
Ok(quote! {
#(#mod_attrs)*
pub mod #mod_name {
#(#orig_content)*
#(#inner_modules)*
#mod_gen
}
})
} else {
// Regenerate the original module as-is.
Ok(quote! {
#(#mod_attrs)*
pub mod #mod_name {
#(#orig_content)*
}
})
}
}
pub fn name(&self) -> Option<&syn::Ident> {
@ -356,7 +268,10 @@ impl Module {
pub fn content(&self) -> Option<&Vec<syn::Item>> {
match self.mod_all {
Some(syn::ItemMod { content: Some((_, ref vec)), .. }) => Some(vec),
Some(syn::ItemMod {
content: Some((_, ref vec)),
..
}) => Some(vec),
_ => None,
}
}
@ -495,7 +410,8 @@ mod module_tests {
assert!(item_mod.fns.is_empty());
assert!(item_mod.consts.is_empty());
assert_eq!(item_mod.submodules.len(), 1);
assert!(item_mod.submodules[0].fns.is_empty());
assert_eq!(item_mod.submodules[0].fns.len(), 1);
assert!(item_mod.submodules[0].fns[0].params.skip);
assert!(item_mod.submodules[0].consts.is_empty());
assert!(item_mod.submodules[0].submodules.is_empty());
}
@ -516,7 +432,8 @@ mod module_tests {
let item_mod = syn::parse2::<Module>(input_tokens).unwrap();
assert!(item_mod.fns.is_empty());
assert!(item_mod.consts.is_empty());
assert!(item_mod.submodules.is_empty());
assert_eq!(item_mod.submodules.len(), 1);
assert!(item_mod.submodules[0].params.skip);
}
#[test]
@ -548,7 +465,8 @@ mod module_tests {
};
let item_mod = syn::parse2::<Module>(input_tokens).unwrap();
assert!(item_mod.fns.is_empty());
assert_eq!(item_mod.fns.len(), 1);
assert!(item_mod.fns[0].params.skip);
assert!(item_mod.consts.is_empty());
}
@ -564,7 +482,8 @@ mod module_tests {
};
let item_mod = syn::parse2::<Module>(input_tokens).unwrap();
assert!(item_mod.fns.is_empty());
assert_eq!(item_mod.fns.len(), 1);
assert!(item_mod.fns[0].params.skip);
assert!(item_mod.consts.is_empty());
}
@ -599,7 +518,7 @@ mod generate_tests {
.zip(expected.chars())
.inspect(|_| counter += 1)
.skip_while(|(a, e)| *a == *e);
let (actual_diff, expected_diff) = {
let (_actual_diff, _expected_diff) = {
let mut actual_diff = String::new();
let mut expected_diff = String::new();
for (a, e) in iter.take(50) {

86
codegen/src/rhai_module.rs
View File

@ -1,4 +1,6 @@
use quote::quote;
use std::collections::HashMap;
use quote::{quote, ToTokens};
use crate::function::ExportedFn;
use crate::module::Module;
@ -6,9 +8,9 @@ use crate::module::Module;
pub(crate) type ExportedConst = (String, syn::Expr);
pub(crate) fn generate_body(
fns: &Vec<ExportedFn>,
consts: &Vec<ExportedConst>,
submodules: &Vec<Module>,
fns: &[ExportedFn],
consts: &[ExportedConst],
submodules: &[Module],
) -> proc_macro2::TokenStream {
let mut set_fn_stmts: Vec<syn::Stmt> = Vec::new();
let mut set_const_stmts: Vec<syn::Stmt> = Vec::new();
@ -26,17 +28,21 @@ pub(crate) fn generate_body(
}
for itemmod in submodules {
if itemmod.skipped() {
continue;
}
let module_name: &syn::Ident = itemmod.module_name().unwrap();
let exported_name: syn::LitStr = if let Some(name) = itemmod.exported_name() {
syn::LitStr::new(&name, proc_macro2::Span::call_site())
} else {
syn::LitStr::new(&module_name.to_string(), proc_macro2::Span::call_site())
};
let cfg_attrs: Vec<&syn::Attribute> = itemmod.attrs().unwrap().iter().filter(|&a| {
a.path.get_ident()
.map(|i| i.to_string() == "cfg")
.unwrap_or(false)
}).collect();
let cfg_attrs: Vec<&syn::Attribute> = itemmod
.attrs()
.unwrap()
.iter()
.filter(|&a| a.path.get_ident().map(|i| *i == "cfg").unwrap_or(false))
.collect();
add_mod_blocks.push(
syn::parse2::<syn::ExprBlock>(quote! {
#(#cfg_attrs)* {
@ -47,10 +53,12 @@ pub(crate) fn generate_body(
);
}
// NB: these are token streams, because reparsing messes up "> >" vs ">>"
let mut gen_fn_tokens: Vec<proc_macro2::TokenStream> = Vec::new();
for function in fns {
if function.params.skip {
continue;
}
let fn_token_name = syn::Ident::new(
&format!("{}_token", function.name().to_string()),
function.name().span(),
@ -67,24 +75,24 @@ pub(crate) fn generate_body(
syn::FnArg::Receiver(_) => panic!("internal error: receiver fn outside impl!?"),
syn::FnArg::Typed(syn::PatType { ref ty, .. }) => {
let arg_type = match ty.as_ref() {
&syn::Type::Reference(syn::TypeReference {
syn::Type::Reference(syn::TypeReference {
mutability: None,
ref elem,
..
}) => match elem.as_ref() {
&syn::Type::Path(ref p) if p.path == str_type_path => {
syn::Type::Path(ref p) if p.path == str_type_path => {
syn::parse2::<syn::Type>(quote! {
ImmutableString })
.unwrap()
}
_ => panic!("internal error: non-string shared reference!?"),
},
&syn::Type::Reference(syn::TypeReference {
syn::Type::Reference(syn::TypeReference {
mutability: Some(_),
ref elem,
..
}) => match elem.as_ref() {
&syn::Type::Path(ref p) => syn::parse2::<syn::Type>(quote! {
syn::Type::Path(ref p) => syn::parse2::<syn::Type>(quote! {
#p })
.unwrap(),
_ => panic!("internal error: non-string shared reference!?"),
@ -138,3 +146,53 @@ pub(crate) fn generate_body(
#(#gen_fn_tokens)*
}
}
pub(crate) fn check_rename_collisions(fns: &Vec<ExportedFn>) -> Result<(), syn::Error> {
let mut renames = HashMap::<String, proc_macro2::Span>::new();
let mut names = HashMap::<String, proc_macro2::Span>::new();
for itemfn in fns.iter() {
if let Some(ref name) = itemfn.params.name {
let current_span = itemfn.params.span.as_ref().unwrap();
let key = itemfn.arg_list().fold(name.clone(), |mut argstr, fnarg| {
let type_string: String = match fnarg {
syn::FnArg::Receiver(_) => unimplemented!("receiver rhai_fns not implemented"),
syn::FnArg::Typed(syn::PatType { ref ty, .. }) => {
ty.as_ref().to_token_stream().to_string()
}
};
argstr.push('.');
argstr.push_str(&type_string);
argstr
});
if let Some(other_span) = renames.insert(key, *current_span) {
let mut err = syn::Error::new(
*current_span,
format!("duplicate Rhai signature for '{}'", &name),
);
err.combine(syn::Error::new(
other_span,
format!("duplicated function renamed '{}'", &name),
));
return Err(err);
}
} else {
let ident = itemfn.name();
names.insert(ident.to_string(), ident.span());
}
}
for (new_name, attr_span) in renames.drain() {
let new_name = new_name.split('.').next().unwrap();
if let Some(fn_span) = names.get(new_name) {
let mut err = syn::Error::new(
attr_span,
format!("duplicate Rhai signature for '{}'", &new_name),
);
err.combine(syn::Error::new(
*fn_span,
format!("duplicated function '{}'", &new_name),
));
return Err(err);
}
}
Ok(())
}

4
codegen/ui_tests/rhai_fn_rename_dot.stderr
View File

@ -1,8 +1,8 @@
error: Rhai function names may not contain dot
--> $DIR/rhai_fn_rename_dot.rs:12:15
--> $DIR/rhai_fn_rename_dot.rs:12:22
|
12 | #[rhai_fn(name = "foo.bar")]
| ^^^^^^^^^^^^^^^^
| ^^^^^^^^^
error[E0433]: failed to resolve: use of undeclared type or module `test_module`
--> $DIR/rhai_fn_rename_dot.rs:23:8