104 lines
3.6 KiB
Rust
104 lines
3.6 KiB
Rust
#![feature(trace_macros)]
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#![feature(proc_macro)]
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extern crate proc_macro;
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#[macro_use]
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extern crate quote;
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extern crate syn;
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extern crate schala_repl;
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use proc_macro::TokenStream;
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use syn::{Ident, Attribute, DeriveInput};
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fn extract_attribute_arg_by_name(name: &str, attrs: &Vec<Attribute>) -> Option<String> {
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use syn::{Meta, Lit, MetaNameValue};
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attrs.iter().map(|attr| attr.interpret_meta()).find(|meta| {
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match meta {
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&Some(Meta::NameValue(MetaNameValue { ident, .. })) if ident.as_ref() == name => true,
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_ => false
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}
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}).and_then(|meta| {
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match meta {
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Some(Meta::NameValue(MetaNameValue { lit: Lit::Str(litstr), .. })) => Some(litstr.value()),
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_ => None,
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}
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})
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}
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fn extract_attribute_list(name: &str, attrs: &Vec<Attribute>) -> Option<Vec<(Ident, Option<Vec<Ident>>)>> {
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use syn::{Meta, MetaList, NestedMeta};
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attrs.iter().find(|attr| {
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match attr.path.segments.iter().nth(0) {
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Some(segment) if segment.ident.as_ref() == name => true,
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_ => false
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}
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}).and_then(|attr| {
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match attr.interpret_meta() {
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Some(Meta::List(MetaList { nested, .. })) => {
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Some(nested.iter().map(|nested_meta| match nested_meta {
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&NestedMeta::Meta(Meta::Word(ident)) => (ident, None),
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&NestedMeta::Meta(Meta::List(MetaList { ident, nested: ref nested2, .. })) => {
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let own_args = nested2.iter().map(|nested_meta2| match nested_meta2 {
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&NestedMeta::Meta(Meta::Word(ident)) => ident,
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_ => panic!("Bad format for doubly-nested attribute list")
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}).collect();
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(ident, Some(own_args))
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},
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_ => panic!("Bad format for nested list")
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}).collect())
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},
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_ => panic!("{} must be a comma-delimited list surrounded by parens", name)
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}
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})
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}
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#[proc_macro_derive(ProgrammingLanguageInterface, attributes(LanguageName, SourceFileExtension, PipelineSteps))]
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pub fn derive_programming_language_interface(input: TokenStream) -> TokenStream {
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use schala_repl::PassDescriptor;
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let ast: DeriveInput = syn::parse(input).unwrap();
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let name = &ast.ident;
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let attrs = &ast.attrs;
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let language_name: String = extract_attribute_arg_by_name("LanguageName", attrs).expect("LanguageName is required");
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let file_ext = extract_attribute_arg_by_name("SourceFileExtension", attrs).expect("SourceFileExtension is required");
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let passes = extract_attribute_list("PipelineSteps", attrs).expect("PipelineSteps are required");
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let pass_idents = passes.iter().map(|x| x.0);
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//let pass_names: Vec<String> = passes.iter().map(|pass| pass.0.to_string()).collect();
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let pass_descriptors = passes.iter().map(|pass| {
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let name = pass.0.to_string();
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let opts: Vec<String> = match &pass.1 {
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None => vec![],
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Some(opts) => opts.iter().map(|o| o.to_string()).collect(),
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};
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quote! {
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PassDescriptor {
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name: #name.to_string(),
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debug_options: vec![#(format!(#opts)),*]
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}
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}
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});
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let tokens = quote! {
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use schala_repl::PassDescriptor;
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impl ProgrammingLanguageInterface for #name {
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fn get_language_name(&self) -> String {
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#language_name.to_string()
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}
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fn get_source_file_suffix(&self) -> String {
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#file_ext.to_string()
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}
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fn execute_pipeline(&mut self, input: &str, options: &EvalOptions) -> FinishedComputation {
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let mut chain = pass_chain![self, options; #(#pass_idents),* ];
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chain(input)
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}
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fn get_passes(&self) -> Vec<PassDescriptor> {
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vec![ #(#pass_descriptors),* ]
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//vec![ #(PassDescriptor { name: #pass_names.to_string(), debug_options: vec![] }),* ]
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}
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}
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};
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tokens.into()
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}
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