178 lines
4.2 KiB
Rust
178 lines
4.2 KiB
Rust
use proc_macro2::TokenStream;
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use syn::*;
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use syn::parse::*;
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use syn::visit::*;
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use indexmap::IndexSet;
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struct StaticStrVisitor {
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static_strs: IndexSet<String>,
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}
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impl StaticStrVisitor {
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fn new() -> Self {
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Self { static_strs: IndexSet::new() }
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}
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}
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struct MacroFnArgs {
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args: Vec<Expr>,
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}
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struct ReadHeapCellExprAndArms {
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expr: Expr,
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arms: Vec<Arm>,
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}
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impl Parse for ReadHeapCellExprAndArms {
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fn parse(input: ParseStream) -> Result<Self> {
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let mut arms = vec![];
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let expr = input.parse()?;
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input.parse::<Token![,]>()?;
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arms.push(input.parse()?);
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while !input.is_empty() {
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if let Ok(_) = input.parse::<Token![,]>() {}
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arms.push(input.parse()?);
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}
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Ok(ReadHeapCellExprAndArms { expr, arms })
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}
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}
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impl Parse for MacroFnArgs {
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fn parse(input: ParseStream) -> Result<Self> {
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let mut args = vec![];
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if !input.is_empty() {
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args.push(input.parse()?);
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}
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while !input.is_empty() {
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if let Ok(_) = input.parse::<Token![,]>() {}
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args.push(input.parse()?);
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}
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Ok(MacroFnArgs { args })
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}
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}
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impl<'ast> Visit<'ast> for StaticStrVisitor {
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fn visit_macro(&mut self, m: &'ast Macro) {
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let Macro { path, .. } = m;
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if path.is_ident("atom") {
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if let Some(Lit::Str(string)) = m.parse_body::<Lit>().ok() {
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self.static_strs.insert(string.value());
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}
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} else if path.is_ident("read_heap_cell") {
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if let Some(m) = m.parse_body::<ReadHeapCellExprAndArms>().ok() {
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self.visit_expr(&m.expr);
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for e in m.arms {
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self.visit_arm(&e);
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}
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}
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} else {
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if let Some(m) = m.parse_body::<MacroFnArgs>().ok() {
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for e in m.args {
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self.visit_expr(&e);
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}
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}
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}
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}
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}
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pub fn index_static_strings(instruction_rs_path: &std::path::Path) -> TokenStream {
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use quote::*;
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use std::ffi::OsStr;
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use std::fs::File;
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use std::io::Read;
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use walkdir::WalkDir;
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fn filter_rust_files(e: &walkdir::DirEntry) -> bool {
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if e.path().is_dir() {
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return true;
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}
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e.path().extension().and_then(OsStr::to_str) == Some("rs")
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}
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let mut visitor = StaticStrVisitor::new();
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fn process_filepath(path: &std::path::Path) -> std::result::Result<syn::File, ()> {
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let mut src = String::new();
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let mut file = match File::open(path) {
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Ok(file) => file,
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Err(_) => return Err(()),
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};
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match file.read_to_string(&mut src) {
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Ok(_) => {}
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Err(e) => {
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panic!("error reading file: {:?}", e);
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}
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}
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let syntax = match syn::parse_file(&src) {
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Ok(s) => s,
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Err(e) => {
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panic!("parse error: {} in file {:?}", e, path);
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}
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};
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Ok(syntax)
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}
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for entry in WalkDir::new("src/")
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.into_iter()
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.filter_entry(filter_rust_files)
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{
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let entry = entry.unwrap();
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if entry.path().is_dir() {
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continue;
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}
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let syntax = match process_filepath(entry.path()) {
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Ok(syntax) => syntax,
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Err(_) => continue,
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};
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visitor.visit_file(&syntax);
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}
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match process_filepath(instruction_rs_path) {
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Ok(syntax) => visitor.visit_file(&syntax),
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Err(_) => {}
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}
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let indices = (0..visitor.static_strs.len()).map(|i| i << 3);
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let indices_iter = indices.clone();
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let static_strs_len = visitor.static_strs.len();
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let static_strs: &Vec<_> = &visitor.static_strs.into_iter().collect();
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quote! {
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use phf;
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static STRINGS: [&'static str; #static_strs_len] = [
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#(
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#static_strs,
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)*
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];
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#[macro_export]
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macro_rules! atom {
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#((#static_strs) => { Atom { index: #indices_iter } };)*
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}
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static STATIC_ATOMS_MAP: phf::Map<&'static str, Atom> = phf::phf_map! {
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#(#static_strs => { Atom { index: #indices } },)*
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};
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}
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}
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