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Icky Rust AST
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[package] | |
name = "trace" | |
version = "0.0.1" | |
authors = ["Till Hoeppner <till@hoeppner.ws>"] | |
[lib] | |
name = "trace" | |
path = "src/lib.rs" | |
plugin = true |
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src/trace.rs:32:15: 32:44 error: the trait `core::ops::Fn<(syntax::ptr::P<syntax::ast::Item>,), ()>` is not implemented for the type `|syntax::ptr::P<syntax::ast::Item>|` | |
src/trace.rs:32 trait_def.expand(cx, mitem, item, push) | |
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
error: aborting due to previous error | |
Could not compile `trace`. |
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#![feature(macro_rules, plugin_registrar, quote, phase)] | |
#![deny(unused_imports)] | |
#![deny(unused_variables)] | |
#[phase(plugin,link)] | |
extern crate syntax; | |
#[phase(plugin, link)] | |
extern crate rustc; | |
#[cfg(test)] | |
extern crate sync; | |
use rustc::plugin::Registry; | |
use syntax::ext::base::Decorator; | |
use syntax::parse::token::intern; | |
pub mod trace; | |
#[plugin_registrar] | |
pub fn plugin_registrar(reg: &mut Registry) { | |
reg.register_syntax_extension(intern("trace"), Decorator(box trace::expand_trace)); | |
} |
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use syntax::ext::base::ExtCtxt; | |
use syntax::codemap::Span; | |
use syntax::ptr::P; | |
use syntax::ast::{Item, MetaItem, Expr}; | |
use syntax::attr; | |
use syntax::ast; | |
use syntax::ext::build::AstBuilder; | |
use syntax::ext::deriving::generic::{combine_substructure, EnumMatching, FieldInfo, MethodDef, Struct, Substructure, TraitDef, ty}; | |
use syntax::parse::token::InternedString; | |
pub fn expand_trace(cx: &mut ExtCtxt, span: Span, mitem: &MetaItem, item: &Item, push: |P<Item>|) { | |
let trait_def = TraitDef { | |
span: span, | |
attributes: Vec::new(), | |
path: ty::Path::new(vec!("gc","Trace")), | |
additional_bounds: Vec::new(), | |
generics: ty::LifetimeBounds::empty(), | |
methods: vec!( | |
MethodDef { | |
name: "trace", | |
generics: ty::LifetimeBounds::empty(), | |
explicit_self: Some(Some(ty::PtrTy::Borrowed(None, ast::MutImmutable))), | |
args: vec!(ty::Ptr(box ty::Literal(ty::Path::new(vec!("gc", "Manager"))), ty::Raw(ast::MutMutable))), | |
ret_ty: ty::nil_ty(), | |
attributes: vec!(attr::mk_attr_outer(attr::mk_attr_id(), attr::mk_word_item(InternedString::new("inline")))), | |
combine_substructure: combine_substructure(|a, b, c| { | |
traceable_substructure(a, b, c) | |
}) | |
} | |
) | |
}; | |
trait_def.expand(cx, mitem, item, push) | |
} | |
// Mostly copied from syntax::ext::deriving::hash | |
/// Defines how the implementation for `trace()` is to be generated | |
fn traceable_substructure(cx: &mut ExtCtxt, trait_span: Span, substr: &Substructure) -> P<Expr> { | |
let state_expr = match substr.nonself_args { | |
[ref state_expr] => state_expr, | |
_ => cx.span_bug(trait_span, "incorrect number of arguments in `trace`") | |
}; | |
let trace_ident = substr.method_ident; | |
let call_trace = |span, thing_expr| { | |
let expr = cx.expr_method_call(span, thing_expr, trace_ident, vec!(state_expr.clone())); | |
cx.stmt_expr(expr) | |
}; | |
let mut stmts = Vec::new(); | |
let fields = match *substr.fields { | |
Struct(ref fs) | EnumMatching(_, _, ref fs) => fs, | |
_ => cx.span_bug(trait_span, "impossible substructure in `trace`") | |
}; | |
for &FieldInfo { ref self_, span, .. } in fields.iter() { | |
stmts.push(call_trace(span, self_.clone())); | |
} | |
cx.expr_block(cx.block(trait_span, stmts, None)) | |
} |
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