266 lines
9.9 KiB
Rust
266 lines
9.9 KiB
Rust
use std::collections::HashMap;
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use quote::{quote, ToTokens};
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use crate::attrs::ExportScope;
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use crate::function::{ExportedFn, FnSpecialAccess};
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use crate::module::Module;
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pub(crate) type ExportedConst = (String, Box<syn::Type>, syn::Expr);
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pub(crate) fn generate_body(
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fns: &mut [ExportedFn],
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consts: &[ExportedConst],
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submodules: &mut [Module],
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parent_scope: &ExportScope,
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) -> proc_macro2::TokenStream {
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let mut set_fn_stmts: Vec<syn::Stmt> = Vec::new();
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let mut set_const_stmts: Vec<syn::Stmt> = Vec::new();
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let mut add_mod_blocks: Vec<syn::ExprBlock> = Vec::new();
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let mut set_flattened_mod_blocks: Vec<syn::ExprBlock> = Vec::new();
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let str_type_path = syn::parse2::<syn::Path>(quote! { str }).unwrap();
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let string_type_path = syn::parse2::<syn::Path>(quote! { String }).unwrap();
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for (const_name, _, _) in consts {
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let const_literal = syn::LitStr::new(&const_name, proc_macro2::Span::call_site());
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let const_ref = syn::Ident::new(&const_name, proc_macro2::Span::call_site());
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set_const_stmts.push(
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syn::parse2::<syn::Stmt>(quote! {
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m.set_var(#const_literal, #const_ref);
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})
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.unwrap(),
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);
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}
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for itemmod in submodules {
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itemmod.update_scope(&parent_scope);
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if itemmod.skipped() {
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continue;
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}
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let module_name: &syn::Ident = itemmod.module_name().unwrap();
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let exported_name: syn::LitStr = if let Some(name) = itemmod.exported_name() {
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syn::LitStr::new(&name, proc_macro2::Span::call_site())
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} else {
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syn::LitStr::new(&module_name.to_string(), proc_macro2::Span::call_site())
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};
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let cfg_attrs: Vec<&syn::Attribute> = itemmod
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.attrs()
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.unwrap()
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.iter()
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.filter(|&a| a.path.get_ident().map(|i| *i == "cfg").unwrap_or(false))
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.collect();
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add_mod_blocks.push(
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syn::parse2::<syn::ExprBlock>(quote! {
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#(#cfg_attrs)* {
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m.set_sub_module(#exported_name, self::#module_name::rhai_module_generate());
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}
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})
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.unwrap(),
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);
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set_flattened_mod_blocks.push(
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syn::parse2::<syn::ExprBlock>(quote! {
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#(#cfg_attrs)* {
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self::#module_name::rhai_generate_into_module(m, flatten);
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}
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})
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.unwrap(),
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);
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}
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// NB: these are token streams, because reparsing messes up "> >" vs ">>"
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let mut gen_fn_tokens: Vec<proc_macro2::TokenStream> = Vec::new();
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for function in fns {
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function.update_scope(&parent_scope);
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if function.skipped() {
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continue;
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}
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let fn_token_name = syn::Ident::new(
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&format!("{}_token", function.name().to_string()),
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function.name().span(),
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);
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let reg_names = function.exported_names();
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let fn_input_types: Vec<syn::Expr> = function
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.arg_list()
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.map(|fnarg| match fnarg {
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syn::FnArg::Receiver(_) => panic!("internal error: receiver fn outside impl!?"),
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syn::FnArg::Typed(syn::PatType { ref ty, .. }) => {
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let arg_type = match flatten_type_groups(ty.as_ref()) {
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syn::Type::Reference(syn::TypeReference {
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mutability: None,
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ref elem,
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..
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}) => match flatten_type_groups(elem.as_ref()) {
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syn::Type::Path(ref p) if p.path == str_type_path => {
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syn::parse2::<syn::Type>(quote! {
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ImmutableString })
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.unwrap()
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}
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_ => panic!("internal error: non-string shared reference!?"),
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},
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syn::Type::Path(ref p) if p.path == string_type_path => {
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syn::parse2::<syn::Type>(quote! {
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ImmutableString })
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.unwrap()
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}
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syn::Type::Reference(syn::TypeReference {
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mutability: Some(_),
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ref elem,
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..
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}) => match flatten_type_groups(elem.as_ref()) {
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syn::Type::Path(ref p) => syn::parse2::<syn::Type>(quote! {
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#p })
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.unwrap(),
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_ => panic!("internal error: invalid mutable reference!?"),
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},
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t => t.clone(),
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};
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syn::parse2::<syn::Expr>(quote! {
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core::any::TypeId::of::<#arg_type>()})
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.unwrap()
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}
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})
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.collect();
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for fn_literal in reg_names {
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set_fn_stmts.push(
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syn::parse2::<syn::Stmt>(quote! {
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m.set_fn(#fn_literal, FnAccess::Public, &[#(#fn_input_types),*],
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CallableFunction::from_plugin(#fn_token_name()));
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})
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.unwrap(),
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);
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}
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gen_fn_tokens.push(quote! {
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#[allow(non_camel_case_types)]
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struct #fn_token_name();
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});
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gen_fn_tokens.push(function.generate_impl(&fn_token_name.to_string()));
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gen_fn_tokens.push(function.generate_callable(&fn_token_name.to_string()));
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gen_fn_tokens.push(function.generate_input_types(&fn_token_name.to_string()));
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}
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let mut generate_fncall = syn::parse2::<syn::ItemMod>(quote! {
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pub mod generate_info {
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#[allow(unused_imports)]
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use super::*;
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pub fn rhai_module_generate() -> Module {
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let mut m = Module::new();
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rhai_generate_into_module(&mut m, false);
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m
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}
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#[allow(unused_mut)]
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pub fn rhai_generate_into_module(m: &mut Module, flatten: bool) {
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#(#set_fn_stmts)*
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#(#set_const_stmts)*
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if flatten {
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#(#set_flattened_mod_blocks)*
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} else {
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#(#add_mod_blocks)*
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}
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}
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}
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})
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.unwrap();
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let (_, generate_call_content) = generate_fncall.content.take().unwrap();
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quote! {
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#(#generate_call_content)*
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#(#gen_fn_tokens)*
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}
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}
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pub(crate) fn flatten_type_groups(ty: &syn::Type) -> &syn::Type {
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match ty {
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syn::Type::Group(syn::TypeGroup { ref elem, .. })
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| syn::Type::Paren(syn::TypeParen { ref elem, .. }) => flatten_type_groups(elem.as_ref()),
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_ => ty,
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}
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}
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pub(crate) fn check_rename_collisions(fns: &Vec<ExportedFn>) -> Result<(), syn::Error> {
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fn make_key(name: String, itemfn: &ExportedFn) -> String {
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itemfn.arg_list().fold(name, |mut argstr, fnarg| {
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let type_string: String = match fnarg {
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syn::FnArg::Receiver(_) => unimplemented!("receiver rhai_fns not implemented"),
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syn::FnArg::Typed(syn::PatType { ref ty, .. }) => {
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ty.as_ref().to_token_stream().to_string()
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}
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};
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argstr.push('.');
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argstr.push_str(&type_string);
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argstr
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})
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}
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let mut renames = HashMap::<String, proc_macro2::Span>::new();
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let mut fn_names = HashMap::<String, proc_macro2::Span>::new();
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let mut fn_sig = HashMap::<String, proc_macro2::Span>::new();
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for itemfn in fns.iter() {
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if itemfn.params().name.is_some() || itemfn.params().special != FnSpecialAccess::None {
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let mut names = itemfn
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.params()
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.name
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.as_ref()
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.map(|v| v.iter().map(|n| (n.clone(), n.clone())).collect())
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.unwrap_or_else(|| Vec::new());
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if let Some((s, n, _)) = itemfn.params().special.get_fn_name() {
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names.push((s, n));
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}
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for (name, fn_name) in names {
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let current_span = itemfn.params().span.as_ref().unwrap();
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let key = make_key(name.clone(), itemfn);
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if let Some(other_span) = renames.insert(key, *current_span) {
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let mut err = syn::Error::new(
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*current_span,
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format!("duplicate Rhai signature for '{}'", &fn_name),
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);
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err.combine(syn::Error::new(
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other_span,
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format!("duplicated function renamed '{}'", &fn_name),
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));
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return Err(err);
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}
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}
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} else {
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let ident = itemfn.name();
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if let Some(other_span) = fn_names.insert(ident.to_string(), ident.span()) {
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let mut err = syn::Error::new(
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ident.span(),
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format!("duplicate function '{}'", ident.to_string()),
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);
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err.combine(syn::Error::new(
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other_span,
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format!("duplicated function '{}'", ident.to_string()),
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));
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return Err(err);
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}
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let key = make_key(ident.to_string(), itemfn);
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fn_sig.insert(key, ident.span());
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}
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}
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for (new_name, attr_span) in renames.drain() {
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let fn_name = new_name.split('.').next().unwrap();
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if let Some(fn_span) = fn_sig.get(&new_name) {
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let mut err = syn::Error::new(
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attr_span,
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format!("duplicate Rhai signature for '{}'", &fn_name),
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);
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err.combine(syn::Error::new(
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*fn_span,
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format!("duplicated function '{}'", &fn_name),
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));
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return Err(err);
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}
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}
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Ok(())
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}
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