rustc_data_structures rustc_platform_intrinsics rustc_errors \
rustc_plugin rustc_metadata rustc_passes rustc_save_analysis \
rustc_const_eval rustc_const_math rustc_incremental
-HOST_CRATES := syntax syntax_ext syntax_pos $(RUSTC_CRATES) rustdoc fmt_macros \
+HOST_CRATES := syntax syntax_ext proc_macro syntax_pos $(RUSTC_CRATES) rustdoc fmt_macros \
flate arena graphviz rbml log serialize
TOOLS := compiletest rustdoc rustc rustbook error_index_generator
DEPS_syntax := std term serialize log arena libc rustc_bitflags rustc_unicode rustc_errors syntax_pos
DEPS_syntax_ext := syntax syntax_pos rustc_errors fmt_macros
+DEPS_proc_macro := syntax syntax_pos rustc_plugin log
DEPS_syntax_pos := serialize
DEPS_rustc_const_math := std syntax log serialize
DEPS_rustc_data_structures := std log serialize
DEPS_rustc_driver := arena flate getopts graphviz libc rustc rustc_back rustc_borrowck \
rustc_typeck rustc_mir rustc_resolve log syntax serialize rustc_llvm \
- rustc_trans rustc_privacy rustc_lint rustc_plugin \
- rustc_metadata syntax_ext rustc_passes rustc_save_analysis rustc_const_eval \
+ rustc_trans rustc_privacy rustc_lint rustc_plugin \
+ rustc_metadata syntax_ext proc_macro \
+ rustc_passes rustc_save_analysis rustc_const_eval \
rustc_incremental syntax_pos rustc_errors
DEPS_rustc_errors := log libc serialize syntax_pos
DEPS_rustc_lint := rustc log syntax syntax_pos rustc_const_eval
--- /dev/null
+[package]
+authors = ["The Rust Project Developers"]
+name = "proc_macro"
+version = "0.0.0"
+
+[lib]
+name = "proc_macro"
+path = "lib.rs"
+crate-type = ["dylib"]
+
+[dependencies]
+log = { path = "../liblog" }
+rustc_plugin = { path = "../librustc_plugin" }
+syntax = { path = "../libsyntax" }
+syntax_pos = { path = "../libsyntax_pos" }
--- /dev/null
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+extern crate syntax;
+extern crate syntax_pos;
+
+use syntax::ast::Ident;
+use syntax::codemap::DUMMY_SP;
+use syntax::parse::token::{self, Token, keywords, str_to_ident};
+use syntax::tokenstream::{self, TokenTree, TokenStream};
+use std::rc::Rc;
+
+/// A wrapper around `TokenStream::concat` to avoid extra namespace specification and
+/// provide TokenStream concatenation as a generic operator.
+pub fn concat(ts1: TokenStream, ts2: TokenStream) -> TokenStream {
+ TokenStream::concat(ts1, ts2)
+}
+
+/// Checks if two identifiers have the same name, disregarding context. This allows us to
+/// fake 'reserved' keywords.
+// FIXME We really want `free-identifier-=?` (a la Dybvig 1993). von Tander 2007 is
+// probably the easiest way to do that.
+pub fn ident_eq(tident: &TokenTree, id: Ident) -> bool {
+ let tid = match *tident {
+ TokenTree::Token(_, Token::Ident(ref id)) => id,
+ _ => {
+ return false;
+ }
+ };
+
+ tid.name == id.name
+}
+
+// ____________________________________________________________________________________________
+// Conversion operators
+
+/// Convert a `&str` into a Token.
+pub fn str_to_token_ident(s: &str) -> Token {
+ Token::Ident(str_to_ident(s))
+}
+
+/// Converts a keyword (from `syntax::parse::token::keywords`) into a Token that
+/// corresponds to it.
+pub fn keyword_to_token_ident(kw: keywords::Keyword) -> Token {
+ Token::Ident(str_to_ident(&kw.name().as_str()[..]))
+}
+
+// ____________________________________________________________________________________________
+// Build Procedures
+
+/// Generically takes a `ts` and delimiter and returns `ts` delimited by the specified
+/// delimiter.
+pub fn build_delimited(ts: TokenStream, delim: token::DelimToken) -> TokenStream {
+ let tts = ts.to_tts();
+ TokenStream::from_tts(vec![TokenTree::Delimited(DUMMY_SP,
+ Rc::new(tokenstream::Delimited {
+ delim: delim,
+ open_span: DUMMY_SP,
+ tts: tts,
+ close_span: DUMMY_SP,
+ }))])
+}
+
+/// Takes `ts` and returns `[ts]`.
+pub fn build_bracket_delimited(ts: TokenStream) -> TokenStream {
+ build_delimited(ts, token::DelimToken::Bracket)
+}
+
+/// Takes `ts` and returns `{ts}`.
+pub fn build_brace_delimited(ts: TokenStream) -> TokenStream {
+ build_delimited(ts, token::DelimToken::Brace)
+}
+
+/// Takes `ts` and returns `(ts)`.
+pub fn build_paren_delimited(ts: TokenStream) -> TokenStream {
+ build_delimited(ts, token::DelimToken::Paren)
+}
+
+/// Constructs `()`.
+pub fn build_empty_args() -> TokenStream {
+ build_paren_delimited(TokenStream::mk_empty())
+}
--- /dev/null
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! # Proc_Macro
+//!
+//! A library for procedural macro writers.
+//!
+//! ## Usage
+//! This package provides the `qquote!` macro for syntax creation, and the prelude
+//! (at libproc_macro::prelude) provides a number of operations:
+//! - `concat`, for concatenating two TokenStreams.
+//! - `ident_eq`, for checking if two identifiers are equal regardless of syntax context.
+//! - `str_to_token_ident`, for converting an `&str` into a Token.
+//! - `keyword_to_token_delim`, for converting a `parse::token::keywords::Keyword` into a
+//! Token.
+//! - `build_delimited`, for creating a new TokenStream from an existing one and a delimiter
+//! by wrapping the TokenStream in the delimiter.
+//! - `build_bracket_delimited`, `build_brace_delimited`, and `build_paren_delimited`, for
+//! easing the above.
+//! - `build_empty_args`, which returns a TokenStream containing `()`.
+//! - `lex`, which takes an `&str` and returns the TokenStream it represents.
+//!
+//! The `qquote!` macro also imports `syntax::ext::proc_macro_shim::prelude::*`, so you
+//! will need to `extern crate syntax` for usage. (This is a temporary solution until more
+//! of the external API in libproc_macro is stabilized to support the token construction
+//! operations that the qausiquoter relies on.) The shim file also provides additional
+//! operations, such as `build_block_emitter` (as used in the `cond` example below).
+//!
+//! ## TokenStreams
+//!
+//! TokenStreams serve as the basis of the macro system. They are, in essence, vectors of
+//! TokenTrees, where indexing treats delimited values as a single term. That is, the term
+//! `even(a+c) && even(b)` will be indexibly encoded as `even | (a+c) | even | (b)` where,
+//! in reality, `(a+c)` is actually a decorated pointer to `a | + | c`.
+//!
+//! If a user has a TokenStream that is a single, delimited value, they can use
+//! `maybe_delimited` to destruct it and receive the internal vector as a new TokenStream
+//! as:
+//! ```
+//! `(a+c)`.maybe_delimited() ~> Some(a | + | c)`
+//! ```
+//!
+//! Check the TokenStream documentation for more information; the structure also provides
+//! cheap concatenation and slicing.
+//!
+//! ## Quasiquotation
+//!
+//! The quasiquoter creates output that, when run, constructs the tokenstream specified as
+//! input. For example, `qquote!(5 + 5)` will produce a program, that, when run, will
+//! construct the TokenStream `5 | + | 5`.
+//!
+//! ### Unquoting
+//!
+//! Unquoting is currently done as `unquote`, and works by taking the single next
+//! TokenTree in the TokenStream as the unquoted term. Ergonomically, `unquote(foo)` works
+//! fine, but `unquote foo` is also supported.
+//!
+//! A simple example might be:
+//!
+//!```
+//!fn double(tmp: TokenStream) -> TokenStream {
+//! qquote!(unquote(tmp) * 2)
+//!}
+//!```
+//!
+//! ### Large Example: Implementing Scheme's `cond`
+//!
+//! Below is the full implementation of Scheme's `cond` operator.
+//!
+//! ```
+//! fn cond_rec(input: TokenStream) -> TokenStream {
+//! if input.is_empty() { return quote!(); }
+//!
+//! let next = input.slice(0..1);
+//! let rest = input.slice_from(1..);
+//!
+//! let clause : TokenStream = match next.maybe_delimited() {
+//! Some(ts) => ts,
+//! _ => panic!("Invalid input"),
+//! };
+//!
+//! // clause is ([test]) [rhs]
+//! if clause.len() < 2 { panic!("Invalid macro usage in cond: {:?}", clause) }
+//!
+//! let test: TokenStream = clause.slice(0..1);
+//! let rhs: TokenStream = clause.slice_from(1..);
+//!
+//! if ident_eq(&test[0], str_to_ident("else")) || rest.is_empty() {
+//! quote!({unquote(rhs)})
+//! } else {
+//! quote!({if unquote(test) { unquote(rhs) } else { cond!(unquote(rest)) } })
+//! }
+//! }
+//! ```
+//!
+
+#![crate_name = "proc_macro"]
+#![unstable(feature = "rustc_private", issue = "27812")]
+#![feature(plugin_registrar)]
+#![crate_type = "dylib"]
+#![crate_type = "rlib"]
+#![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
+ html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
+ html_root_url = "https://doc.rust-lang.org/nightly/")]
+#![cfg_attr(not(stage0), deny(warnings))]
+
+#![feature(staged_api)]
+#![feature(rustc_diagnostic_macros)]
+#![feature(rustc_private)]
+
+extern crate rustc_plugin;
+extern crate syntax;
+extern crate syntax_pos;
+#[macro_use] extern crate log;
+
+mod qquote;
+pub mod build;
+pub mod parse;
+pub mod prelude;
+use qquote::qquote;
+
+use rustc_plugin::Registry;
+
+// ____________________________________________________________________________________________
+// Main macro definition
+
+#[plugin_registrar]
+pub fn plugin_registrar(reg: &mut Registry) {
+ reg.register_macro("qquote", qquote);
+}
--- /dev/null
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Parsing utilities for writing procedural macros.
+
+extern crate syntax;
+
+use syntax::parse::{ParseSess, filemap_to_tts};
+use syntax::tokenstream::TokenStream;
+
+/// Map a string to tts, using a made-up filename. For example, `lex(15)` will return a
+/// TokenStream containing the literal 15.
+pub fn lex(source_str: &str) -> TokenStream {
+ let ps = ParseSess::new();
+ TokenStream::from_tts(filemap_to_tts(&ps,
+ ps.codemap().new_filemap("procmacro_lex".to_string(),
+ None,
+ source_str.to_owned())))
+}
--- /dev/null
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+pub use build::*;
+pub use parse::*;
--- /dev/null
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! # Quasiquoter
+//! This file contains the implementation internals of the quasiquoter provided by `quote!`.
+//!
+//! ## Ouput
+//! The quasiquoter produces output of the form:
+//! let tmp0 = ...;
+//! let tmp1 = ...;
+//! ...
+//! concat(from_tokens(...), concat(...))
+//!
+//! To the more explicit, the quasiquoter produces a series of bindings that each
+//! construct TokenStreams via constructing Tokens and using `from_tokens`, ultimately
+//! invoking `concat` on these bindings (and inlined expressions) to construct a
+//! TokenStream that resembles the output syntax.
+//!
+
+extern crate rustc_plugin;
+extern crate syntax;
+extern crate syntax_pos;
+
+use build::*;
+use parse::lex;
+use qquote::int_build::*;
+
+use syntax::ast::Ident;
+use syntax::codemap::Span;
+use syntax::ext::base::*;
+use syntax::ext::base;
+use syntax::ext::proc_macro_shim::build_block_emitter;
+use syntax::parse::token::{self, Token, gensym_ident, str_to_ident};
+use syntax::print::pprust;
+use syntax::tokenstream::{TokenTree, TokenStream};
+
+// ____________________________________________________________________________________________
+// Main definition
+/// The user should use the macro, not this procedure.
+pub fn qquote<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[TokenTree])
+ -> Box<base::MacResult + 'cx> {
+
+ debug!("\nTTs in: {:?}\n", pprust::tts_to_string(&tts[..]));
+ let output = qquoter(cx, TokenStream::from_tts(tts.clone().to_owned()));
+ debug!("\nQQ out: {}\n", pprust::tts_to_string(&output.to_tts()[..]));
+ let imports = concat(lex("use syntax::ext::proc_macro_shim::prelude::*;"),
+ lex("use proc_macro::prelude::*;"));
+ build_block_emitter(cx, sp, build_brace_delimited(concat(imports, output)))
+}
+
+// ____________________________________________________________________________________________
+// Datatype Definitions
+
+#[derive(Debug)]
+struct QDelimited {
+ delim: token::DelimToken,
+ open_span: Span,
+ tts: Vec<QTT>,
+ close_span: Span,
+}
+
+#[derive(Debug)]
+enum QTT {
+ TT(TokenTree),
+ QDL(QDelimited),
+ QIdent(TokenTree),
+}
+
+type Bindings = Vec<(Ident, TokenStream)>;
+
+// ____________________________________________________________________________________________
+// Quasiquoter Algorithm
+// This algorithm works as follows:
+// Input: TokenStream
+// 1. Walk the TokenStream, gathering up the unquoted expressions and marking them separately.
+// 2. Hoist any unquoted term into its own let-binding via a gensym'd identifier
+// 3. Convert the body from a `complex expression` into a simplified one via `convert_complex_tts
+// 4. Stitch everything together with `concat`.
+fn qquoter<'cx>(cx: &'cx mut ExtCtxt, ts: TokenStream) -> TokenStream {
+ if ts.is_empty() {
+ return lex("TokenStream::mk_empty()");
+ }
+ let qq_res = qquote_iter(cx, 0, ts);
+ let mut bindings = qq_res.0;
+ let body = qq_res.1;
+ let mut cct_res = convert_complex_tts(cx, body);
+
+ bindings.append(&mut cct_res.0);
+
+ if bindings.is_empty() {
+ cct_res.1
+ } else {
+ debug!("BINDINGS");
+ for b in bindings.clone() {
+ debug!("{:?} = {}", b.0, pprust::tts_to_string(&b.1.to_tts()[..]));
+ }
+ TokenStream::concat(unravel(bindings), cct_res.1)
+ }
+}
+
+fn qquote_iter<'cx>(cx: &'cx mut ExtCtxt, depth: i64, ts: TokenStream) -> (Bindings, Vec<QTT>) {
+ let mut depth = depth;
+ let mut bindings: Bindings = Vec::new();
+ let mut output: Vec<QTT> = Vec::new();
+
+ let mut iter = ts.iter();
+
+ loop {
+ let next = iter.next();
+ if next.is_none() {
+ break;
+ }
+ let next = next.unwrap().clone();
+ match next {
+ TokenTree::Token(_, Token::Ident(id)) if is_unquote(id) => {
+ if depth == 0 {
+ let exp = iter.next();
+ if exp.is_none() {
+ break;
+ } // produce an error or something first
+ let exp = vec![exp.unwrap().to_owned()];
+ debug!("RHS: {:?}", exp.clone());
+ let new_id = gensym_ident("tmp");
+ debug!("RHS TS: {:?}", TokenStream::from_tts(exp.clone()));
+ debug!("RHS TS TT: {:?}", TokenStream::from_tts(exp.clone()).to_vec());
+ bindings.push((new_id, TokenStream::from_tts(exp)));
+ debug!("BINDINGS");
+ for b in bindings.clone() {
+ debug!("{:?} = {}", b.0, pprust::tts_to_string(&b.1.to_tts()[..]));
+ }
+ output.push(QTT::QIdent(as_tt(Token::Ident(new_id.clone()))));
+ } else {
+ depth = depth - 1;
+ output.push(QTT::TT(next.clone()));
+ }
+ }
+ TokenTree::Token(_, Token::Ident(id)) if is_qquote(id) => {
+ depth = depth + 1;
+ }
+ TokenTree::Delimited(_, ref dl) => {
+ let br = qquote_iter(cx, depth, TokenStream::from_tts(dl.tts.clone().to_owned()));
+ let mut bind_ = br.0;
+ let res_ = br.1;
+ bindings.append(&mut bind_);
+
+ let new_dl = QDelimited {
+ delim: dl.delim,
+ open_span: dl.open_span,
+ tts: res_,
+ close_span: dl.close_span,
+ };
+
+ output.push(QTT::QDL(new_dl));
+ }
+ t => {
+ output.push(QTT::TT(t));
+ }
+ }
+ }
+
+ (bindings, output)
+}
+
+// ____________________________________________________________________________________________
+// Turns QQTs into a TokenStream and some Bindings.
+/// Construct a chain of concatenations.
+fn unravel_concats(tss: Vec<TokenStream>) -> TokenStream {
+ let mut pushes: Vec<TokenStream> =
+ tss.into_iter().filter(|&ref ts| !ts.is_empty()).collect();
+ let mut output = match pushes.pop() {
+ Some(ts) => ts,
+ None => {
+ return TokenStream::mk_empty();
+ }
+ };
+
+ while let Some(ts) = pushes.pop() {
+ output = build_fn_call(str_to_ident("concat"),
+ concat(concat(ts,
+ from_tokens(vec![Token::Comma])),
+ output));
+ }
+ output
+}
+
+/// This converts the vector of QTTs into a seet of Bindings for construction and the main
+/// body as a TokenStream.
+fn convert_complex_tts<'cx>(cx: &'cx mut ExtCtxt, tts: Vec<QTT>) -> (Bindings, TokenStream) {
+ let mut pushes: Vec<TokenStream> = Vec::new();
+ let mut bindings: Bindings = Vec::new();
+
+ let mut iter = tts.into_iter();
+
+ loop {
+ let next = iter.next();
+ if next.is_none() {
+ break;
+ }
+ let next = next.unwrap();
+ match next {
+ QTT::TT(TokenTree::Token(_, t)) => {
+ let token_out = emit_token(t);
+ pushes.push(token_out);
+ }
+ // FIXME handle sequence repetition tokens
+ QTT::QDL(qdl) => {
+ debug!(" QDL: {:?} ", qdl.tts);
+ let new_id = gensym_ident("qdl_tmp");
+ let mut cct_rec = convert_complex_tts(cx, qdl.tts);
+ bindings.append(&mut cct_rec.0);
+ bindings.push((new_id, cct_rec.1));
+
+ let sep = build_delim_tok(qdl.delim);
+
+ pushes.push(build_mod_call(vec![str_to_ident("proc_macro"),
+ str_to_ident("build"),
+ str_to_ident("build_delimited")],
+ concat(from_tokens(vec![Token::Ident(new_id)]),
+ concat(lex(","), sep))));
+ }
+ QTT::QIdent(t) => {
+ pushes.push(TokenStream::from_tts(vec![t]));
+ pushes.push(TokenStream::mk_empty());
+ }
+ _ => panic!("Unhandled case!"),
+ }
+
+ }
+
+ (bindings, unravel_concats(pushes))
+}
+
+// ____________________________________________________________________________________________
+// Utilities
+
+/// Unravels Bindings into a TokenStream of `let` declarations.
+fn unravel(binds: Bindings) -> TokenStream {
+ let mut output = TokenStream::mk_empty();
+
+ for b in binds {
+ output = concat(output, build_let(b.0, b.1));
+ }
+
+ output
+}
+
+/// Checks if the Ident is `unquote`.
+fn is_unquote(id: Ident) -> bool {
+ let qq = str_to_ident("unquote");
+ id.name == qq.name // We disregard context; unquote is _reserved_
+}
+
+/// Checks if the Ident is `quote`.
+fn is_qquote(id: Ident) -> bool {
+ let qq = str_to_ident("qquote");
+ id.name == qq.name // We disregard context; qquote is _reserved_
+}
+
+mod int_build {
+ extern crate syntax;
+ extern crate syntax_pos;
+
+ use parse::*;
+ use build::*;
+
+ use syntax::ast::{self, Ident};
+ use syntax::codemap::{DUMMY_SP};
+ use syntax::parse::token::{self, Token, keywords, str_to_ident};
+ use syntax::tokenstream::{TokenTree, TokenStream};
+
+ // ____________________________________________________________________________________________
+ // Emitters
+
+ pub fn emit_token(t: Token) -> TokenStream {
+ concat(lex("TokenStream::from_tokens"),
+ build_paren_delimited(build_vec(build_token_tt(t))))
+ }
+
+ pub fn emit_lit(l: token::Lit, n: Option<ast::Name>) -> TokenStream {
+ let suf = match n {
+ Some(n) => format!("Some(ast::Name({}))", n.0),
+ None => "None".to_string(),
+ };
+
+ let lit = match l {
+ token::Lit::Byte(n) => format!("Lit::Byte(token::intern(\"{}\"))", n.to_string()),
+ token::Lit::Char(n) => format!("Lit::Char(token::intern(\"{}\"))", n.to_string()),
+ token::Lit::Integer(n) => format!("Lit::Integer(token::intern(\"{}\"))", n.to_string()),
+ token::Lit::Float(n) => format!("Lit::Float(token::intern(\"{}\"))", n.to_string()),
+ token::Lit::Str_(n) => format!("Lit::Str_(token::intern(\"{}\"))", n.to_string()),
+ token::Lit::ByteStr(n) => format!("Lit::ByteStr(token::intern(\"{}\"))", n.to_string()),
+ _ => panic!("Unsupported literal"),
+ };
+
+ let res = format!("Token::Literal({},{})", lit, suf);
+ debug!("{}", res);
+ lex(&res)
+ }
+
+ // ____________________________________________________________________________________________
+ // Token Builders
+
+ pub fn build_binop_tok(bot: token::BinOpToken) -> TokenStream {
+ match bot {
+ token::BinOpToken::Plus => lex("Token::BinOp(BinOpToken::Plus)"),
+ token::BinOpToken::Minus => lex("Token::BinOp(BinOpToken::Minus)"),
+ token::BinOpToken::Star => lex("Token::BinOp(BinOpToken::Star)"),
+ token::BinOpToken::Slash => lex("Token::BinOp(BinOpToken::Slash)"),
+ token::BinOpToken::Percent => lex("Token::BinOp(BinOpToken::Percent)"),
+ token::BinOpToken::Caret => lex("Token::BinOp(BinOpToken::Caret)"),
+ token::BinOpToken::And => lex("Token::BinOp(BinOpToken::And)"),
+ token::BinOpToken::Or => lex("Token::BinOp(BinOpToken::Or)"),
+ token::BinOpToken::Shl => lex("Token::BinOp(BinOpToken::Shl)"),
+ token::BinOpToken::Shr => lex("Token::BinOp(BinOpToken::Shr)"),
+ }
+ }
+
+ pub fn build_binopeq_tok(bot: token::BinOpToken) -> TokenStream {
+ match bot {
+ token::BinOpToken::Plus => lex("Token::BinOpEq(BinOpToken::Plus)"),
+ token::BinOpToken::Minus => lex("Token::BinOpEq(BinOpToken::Minus)"),
+ token::BinOpToken::Star => lex("Token::BinOpEq(BinOpToken::Star)"),
+ token::BinOpToken::Slash => lex("Token::BinOpEq(BinOpToken::Slash)"),
+ token::BinOpToken::Percent => lex("Token::BinOpEq(BinOpToken::Percent)"),
+ token::BinOpToken::Caret => lex("Token::BinOpEq(BinOpToken::Caret)"),
+ token::BinOpToken::And => lex("Token::BinOpEq(BinOpToken::And)"),
+ token::BinOpToken::Or => lex("Token::BinOpEq(BinOpToken::Or)"),
+ token::BinOpToken::Shl => lex("Token::BinOpEq(BinOpToken::Shl)"),
+ token::BinOpToken::Shr => lex("Token::BinOpEq(BinOpToken::Shr)"),
+ }
+ }
+
+ pub fn build_delim_tok(dt: token::DelimToken) -> TokenStream {
+ match dt {
+ token::DelimToken::Paren => lex("DelimToken::Paren"),
+ token::DelimToken::Bracket => lex("DelimToken::Bracket"),
+ token::DelimToken::Brace => lex("DelimToken::Brace"),
+ token::DelimToken::NoDelim => lex("DelimToken::NoDelim"),
+ }
+ }
+
+ pub fn build_token_tt(t: Token) -> TokenStream {
+ match t {
+ Token::Eq => lex("Token::Eq"),
+ Token::Lt => lex("Token::Lt"),
+ Token::Le => lex("Token::Le"),
+ Token::EqEq => lex("Token::EqEq"),
+ Token::Ne => lex("Token::Ne"),
+ Token::Ge => lex("Token::Ge"),
+ Token::Gt => lex("Token::Gt"),
+ Token::AndAnd => lex("Token::AndAnd"),
+ Token::OrOr => lex("Token::OrOr"),
+ Token::Not => lex("Token::Not"),
+ Token::Tilde => lex("Token::Tilde"),
+ Token::BinOp(tok) => build_binop_tok(tok),
+ Token::BinOpEq(tok) => build_binopeq_tok(tok),
+ Token::At => lex("Token::At"),
+ Token::Dot => lex("Token::Dot"),
+ Token::DotDot => lex("Token::DotDot"),
+ Token::DotDotDot => lex("Token::DotDotDot"),
+ Token::Comma => lex("Token::Comma"),
+ Token::Semi => lex("Token::Semi"),
+ Token::Colon => lex("Token::Colon"),
+ Token::ModSep => lex("Token::ModSep"),
+ Token::RArrow => lex("Token::RArrow"),
+ Token::LArrow => lex("Token::LArrow"),
+ Token::FatArrow => lex("Token::FatArrow"),
+ Token::Pound => lex("Token::Pound"),
+ Token::Dollar => lex("Token::Dollar"),
+ Token::Question => lex("Token::Question"),
+ Token::OpenDelim(dt) => {
+ match dt {
+ token::DelimToken::Paren => lex("Token::OpenDelim(DelimToken::Paren)"),
+ token::DelimToken::Bracket => lex("Token::OpenDelim(DelimToken::Bracket)"),
+ token::DelimToken::Brace => lex("Token::OpenDelim(DelimToken::Brace)"),
+ token::DelimToken::NoDelim => lex("DelimToken::NoDelim"),
+ }
+ }
+ Token::CloseDelim(dt) => {
+ match dt {
+ token::DelimToken::Paren => lex("Token::CloseDelim(DelimToken::Paren)"),
+ token::DelimToken::Bracket => lex("Token::CloseDelim(DelimToken::Bracket)"),
+ token::DelimToken::Brace => lex("Token::CloseDelim(DelimToken::Brace)"),
+ token::DelimToken::NoDelim => lex("DelimToken::NoDelim"),
+ }
+ }
+ Token::Underscore => lex("_"),
+ Token::Literal(lit, sfx) => emit_lit(lit, sfx),
+ // fix ident expansion information... somehow
+ Token::Ident(ident) => lex(&format!("Token::Ident(str_to_ident(\"{}\"))", ident.name)),
+ Token::Lifetime(ident) => lex(&format!("Token::Ident(str_to_ident(\"{}\"))",
+ ident.name)),
+ _ => panic!("Unhandled case!"),
+ }
+ }
+
+ // ____________________________________________________________________________________________
+ // Conversion operators
+
+ pub fn as_tt(t: Token) -> TokenTree {
+ // FIXME do something nicer with the spans
+ TokenTree::Token(DUMMY_SP, t)
+ }
+
+ // ____________________________________________________________________________________________
+ // Build Procedures
+
+ /// Takes `input` and returns `vec![input]`.
+ pub fn build_vec(ts: TokenStream) -> TokenStream {
+ build_mac_call(str_to_ident("vec"), ts)
+ // tts.clone().to_owned()
+ }
+
+ /// Takes `ident` and `rhs` and produces `let ident = rhs;`.
+ pub fn build_let(id: Ident, tts: TokenStream) -> TokenStream {
+ concat(from_tokens(vec![keyword_to_token_ident(keywords::Let),
+ Token::Ident(id),
+ Token::Eq]),
+ concat(tts, from_tokens(vec![Token::Semi])))
+ }
+
+ /// Takes `ident ...`, and `args ...` and produces `ident::...(args ...)`.
+ pub fn build_mod_call(ids: Vec<Ident>, args: TokenStream) -> TokenStream {
+ let call = from_tokens(intersperse(ids.into_iter().map(|id| Token::Ident(id)).collect(),
+ Token::ModSep));
+ concat(call, build_paren_delimited(args))
+ }
+
+ /// Takes `ident` and `args ...` and produces `ident(args ...)`.
+ pub fn build_fn_call(name: Ident, args: TokenStream) -> TokenStream {
+ concat(from_tokens(vec![Token::Ident(name)]), build_paren_delimited(args))
+ }
+
+ /// Takes `ident` and `args ...` and produces `ident!(args ...)`.
+ pub fn build_mac_call(name: Ident, args: TokenStream) -> TokenStream {
+ concat(from_tokens(vec![Token::Ident(name), Token::Not]),
+ build_paren_delimited(args))
+ }
+
+ // ____________________________________________________________________________________________
+ // Utilities
+
+ /// A wrapper around `TokenStream::from_tokens` to avoid extra namespace specification and
+ /// provide it as a generic operator.
+ pub fn from_tokens(tokens: Vec<Token>) -> TokenStream {
+ TokenStream::from_tokens(tokens)
+ }
+
+ pub fn intersperse<T>(vs: Vec<T>, t: T) -> Vec<T>
+ where T: Clone
+ {
+ if vs.len() < 2 {
+ return vs;
+ }
+ let mut output = vec![vs.get(0).unwrap().to_owned()];
+
+ for v in vs.into_iter().skip(1) {
+ output.push(t.clone());
+ output.push(v);
+ }
+ output
+ }
+}
serialize = { path = "../libserialize" }
syntax = { path = "../libsyntax" }
syntax_ext = { path = "../libsyntax_ext" }
-syntax_pos = { path = "../libsyntax_pos" }
\ No newline at end of file
+syntax_pos = { path = "../libsyntax_pos" }
+proc_macro = { path = "../libproc_macro" }
--- /dev/null
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! This is a shim file to ease the transition to the final procedural macro interface for
+//! Macros 2.0. It currently exposes the `libsyntax` operations that the quasiquoter's
+//! output needs to compile correctly, along with the following operators:
+//!
+//! - `build_block_emitter`, which produces a `block` output macro result from the
+//! provided TokenStream.
+
+use ast;
+use codemap::Span;
+use parse::parser::Parser;
+use ptr::P;
+use tokenstream::TokenStream;
+use ext::base::*;
+
+/// Take a `ExtCtxt`, `Span`, and `TokenStream`, and produce a Macro Result that parses
+/// the TokenStream as a block and returns it as an `Expr`.
+pub fn build_block_emitter<'cx>(cx: &'cx mut ExtCtxt, sp: Span, output: TokenStream)
+ -> Box<MacResult + 'cx> {
+ let parser = cx.new_parser_from_tts(&output.to_tts());
+
+ struct Result<'a> {
+ prsr: Parser<'a>,
+ span: Span,
+ }; //FIXME is this the right lifetime
+
+ impl<'a> Result<'a> {
+ fn block(&mut self) -> P<ast::Block> {
+ let res = self.prsr.parse_block().unwrap();
+ res
+ }
+ }
+
+ impl<'a> MacResult for Result<'a> {
+ fn make_expr(self: Box<Self>) -> Option<P<ast::Expr>> {
+ let mut me = *self;
+ Some(P(ast::Expr {
+ id: ast::DUMMY_NODE_ID,
+ node: ast::ExprKind::Block(me.block()),
+ span: me.span,
+ attrs: ast::ThinVec::new(),
+ }))
+
+ }
+ }
+
+ Box::new(Result {
+ prsr: parser,
+ span: sp,
+ })
+}
+
+pub mod prelude {
+ pub use ext::proc_macro_shim::build_block_emitter;
+ pub use ast::Ident;
+ pub use codemap::{DUMMY_SP, Span};
+ pub use ext::base::{ExtCtxt, MacResult};
+ pub use parse::token::{self, Token, DelimToken, keywords, str_to_ident};
+ pub use tokenstream::{TokenTree, TokenStream};
+}
pub mod build;
pub mod expand;
pub mod hygiene;
+ pub mod proc_macro_shim;
pub mod quote;
pub mod source_util;
TokenStream::mk_leaf(Rc::new(trees), span)
}
+ /// Convert a vector of Tokens into a TokenStream.
+ pub fn from_tokens(tokens: Vec<Token>) -> TokenStream {
+ // FIXME do something nicer with the spans
+ TokenStream::from_tts(tokens.into_iter().map(|t| TokenTree::Token(DUMMY_SP, t)).collect())
+ }
+
/// Manually change a TokenStream's span.
pub fn respan(self, span: Span) -> TokenStream {
match self.ts {
name = "log"
version = "0.0.0"
+[[package]]
+name = "proc_macro"
+version = "0.0.0"
+dependencies = [
+ "log 0.0.0",
+ "rustc_plugin 0.0.0",
+ "syntax 0.0.0",
+ "syntax_pos 0.0.0",
+]
+
[[package]]
name = "rbml"
version = "0.0.0"
"flate 0.0.0",
"graphviz 0.0.0",
"log 0.0.0",
+ "proc_macro 0.0.0",
"rustc 0.0.0",
"rustc_back 0.0.0",
"rustc_borrowck 0.0.0",
--- /dev/null
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![allow(unused_parens)]
+#![feature(plugin)]
+#![feature(plugin_registrar)]
+#![feature(rustc_private)]
+#![plugin(proc_macro)]
+
+extern crate rustc_plugin;
+extern crate proc_macro;
+extern crate syntax;
+
+use proc_macro::build::ident_eq;
+
+use syntax::ext::base::{ExtCtxt, MacResult};
+use syntax::ext::proc_macro_shim::build_block_emitter;
+use syntax::tokenstream::{TokenTree, TokenStream};
+use syntax::parse::token::str_to_ident;
+use syntax::codemap::Span;
+
+use rustc_plugin::Registry;
+
+#[plugin_registrar]
+pub fn plugin_registrar(reg: &mut Registry) {
+ reg.register_macro("cond", cond);
+}
+
+fn cond<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[TokenTree]) -> Box<MacResult + 'cx> {
+ let output = cond_rec(TokenStream::from_tts(tts.clone().to_owned()));
+ build_block_emitter(cx, sp, output)
+}
+
+fn cond_rec(input: TokenStream) -> TokenStream {
+ if input.is_empty() {
+ return qquote!();
+ }
+
+ let next = input.slice(0..1);
+ let rest = input.slice_from(1..);
+
+ let clause : TokenStream = match next.maybe_delimited() {
+ Some(ts) => ts,
+ _ => panic!("Invalid input"),
+ };
+
+ // clause is ([test]) [rhs]
+ if clause.len() < 2 { panic!("Invalid macro usage in cond: {:?}", clause) }
+
+ let test: TokenStream = clause.slice(0..1);
+ let rhs: TokenStream = clause.slice_from(1..);
+
+ if ident_eq(&test[0], str_to_ident("else")) || rest.is_empty() {
+ qquote!({unquote(rhs)})
+ } else {
+ qquote!({if unquote(test) { unquote(rhs) } else { cond!(unquote(rest)) } })
+ }
+}
--- /dev/null
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![allow(unused_parens)]
+#![feature(plugin)]
+#![feature(plugin_registrar)]
+#![feature(rustc_private)]
+#![plugin(proc_macro)]
+
+extern crate rustc_plugin;
+extern crate proc_macro;
+extern crate syntax;
+
+use proc_macro::prelude::*;
+
+use rustc_plugin::Registry;
+
+use syntax::ast::Ident;
+use syntax::codemap::{DUMMY_SP, Span};
+use syntax::ext::proc_macro_shim::build_block_emitter;
+use syntax::ext::base::{ExtCtxt, MacResult};
+use syntax::parse::token::{self, Token, DelimToken, keywords, str_to_ident};
+use syntax::tokenstream::{TokenTree, TokenStream};
+
+#[plugin_registrar]
+pub fn plugin_registrar(reg: &mut Registry) {
+ reg.register_macro("cond", cond);
+}
+
+fn cond<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[TokenTree]) -> Box<MacResult + 'cx> {
+ let output = cond_rec(TokenStream::from_tts(tts.clone().to_owned()));
+ build_block_emitter(cx, sp, output)
+}
+
+fn cond_rec(input: TokenStream) -> TokenStream {
+ if input.is_empty() {
+ return qquote!();
+ }
+
+ let next = input.slice(0..1);
+ let rest = input.slice_from(1..);
+
+ let clause : TokenStream = match next.maybe_delimited() {
+ Some(ts) => ts,
+ _ => panic!("Invalid input"),
+ };
+
+ // clause is ([test]) [rhs]
+ if clause.len() < 2 { panic!("Invalid macro usage in cond: {:?}", clause) }
+
+ let test: TokenStream = clause.slice(0..1);
+ let rhs: TokenStream = clause.slice_from(1..);
+
+ if ident_eq(&test[0], str_to_ident("else")) || rest.is_empty() {
+ qquote!({unquote(rhs)})
+ } else {
+ qquote!({if unquote(test) { unquote(rhs) } else { cond!(unquote(rest)) } })
+ }
+}
--- /dev/null
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![allow(unused_parens)]
+#![feature(plugin)]
+#![feature(plugin_registrar)]
+#![feature(rustc_private)]
+#![plugin(proc_macro)]
+
+extern crate rustc_plugin;
+extern crate proc_macro;
+extern crate syntax;
+
+use syntax::ext::proc_macro_shim::prelude::*;
+use proc_macro::prelude::*;
+
+use rustc_plugin::Registry;
+
+#[plugin_registrar]
+pub fn plugin_registrar(reg: &mut Registry) {
+ reg.register_macro("cond", cond);
+}
+
+fn cond<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[TokenTree]) -> Box<MacResult + 'cx> {
+ let output = cond_rec(TokenStream::from_tts(tts.clone().to_owned()));
+ build_block_emitter(cx, sp, output)
+}
+
+fn cond_rec(input: TokenStream) -> TokenStream {
+ if input.is_empty() {
+ return qquote!();
+ }
+
+ let next = input.slice(0..1);
+ let rest = input.slice_from(1..);
+
+ let clause : TokenStream = match next.maybe_delimited() {
+ Some(ts) => ts,
+ _ => panic!("Invalid input"),
+ };
+
+ // clause is ([test]) [rhs]
+ if clause.len() < 2 { panic!("Invalid macro usage in cond: {:?}", clause) }
+
+ let test: TokenStream = clause.slice(0..1);
+ let rhs: TokenStream = clause.slice_from(1..);
+
+ if ident_eq(&test[0], str_to_ident("else")) || rest.is_empty() {
+ qquote!({unquote(rhs)})
+ } else {
+ qquote!({if unquote(test) { unquote(rhs) } else { cond!(unquote(rest)) } })
+ }
+}
--- /dev/null
+// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// ignore-stage1
+
+#![feature(plugin)]
+#![feature(rustc_private)]
+#![plugin(proc_macro)]
+
+extern crate proc_macro;
+use proc_macro::prelude::*;
+
+extern crate syntax;
+use syntax::ast::Ident;
+use syntax::codemap::DUMMY_SP;
+use syntax::parse::token::{self, Token, keywords, str_to_ident};
+
+fn main() {
+ let lex_true = lex("true");
+ assert_eq!(qquote!(true).eq_unspanned(&lex_true), true);
+}
--- /dev/null
+// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// aux-build:cond_plugin.rs
+// ignore-stage1
+
+#![feature(plugin)]
+#![feature(rustc_private)]
+#![plugin(cond_plugin)]
+
+fn fact(n : i64) -> i64 {
+ if n == 0 {
+ 1
+ } else {
+ n * fact(n - 1)
+ }
+}
+
+fn fact_cond(n : i64) -> i64 {
+ cond!(
+ ((n == 0) 1)
+ (else (n * fact_cond(n-1)))
+ )
+}
+
+fn fib(n : i64) -> i64 {
+ if n == 0 || n == 1 {
+ 1
+ } else {
+ fib(n-1) + fib(n-2)
+ }
+}
+
+fn fib_cond(n : i64) -> i64 {
+ cond!(
+ ((n == 0) 1)
+ ((n == 1) 1)
+ (else (fib_cond(n-1) + fib_cond(n-2)))
+ )
+}
+
+fn main() {
+ assert_eq!(fact(3), fact_cond(3));
+ assert_eq!(fact(5), fact_cond(5));
+ assert_eq!(fib(5), fib_cond(5));
+ assert_eq!(fib(8), fib_cond(8));
+}
--- /dev/null
+// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// aux-build:cond_noprelude_plugin.rs
+// ignore-stage1
+
+#![feature(plugin)]
+#![feature(rustc_private)]
+#![plugin(cond_noprelude_plugin)]
+
+fn fact(n : i64) -> i64 {
+ if n == 0 {
+ 1
+ } else {
+ n * fact(n - 1)
+ }
+}
+
+fn fact_cond(n : i64) -> i64 {
+ cond!(
+ ((n == 0) 1)
+ (else (n * fact_cond(n-1)))
+ )
+}
+
+fn fib(n : i64) -> i64 {
+ if n == 0 || n == 1 {
+ 1
+ } else {
+ fib(n-1) + fib(n-2)
+ }
+}
+
+fn fib_cond(n : i64) -> i64 {
+ cond!(
+ ((n == 0) 1)
+ ((n == 1) 1)
+ (else (fib_cond(n-1) + fib_cond(n-2)))
+ )
+}
+
+fn main() {
+ assert_eq!(fact(3), fact_cond(3));
+ assert_eq!(fact(5), fact_cond(5));
+ assert_eq!(fib(5), fib_cond(5));
+ assert_eq!(fib(8), fib_cond(8));
+}
--- /dev/null
+// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// aux-build:cond_prelude_plugin.rs
+// ignore-stage1
+
+#![feature(plugin)]
+#![feature(rustc_private)]
+#![plugin(cond_prelude_plugin)]
+
+fn fact(n : i64) -> i64 {
+ if n == 0 {
+ 1
+ } else {
+ n * fact(n - 1)
+ }
+}
+
+fn fact_cond(n : i64) -> i64 {
+ cond!(
+ ((n == 0) 1)
+ (else (n * fact_cond(n-1)))
+ )
+}
+
+fn fib(n : i64) -> i64 {
+ if n == 0 || n == 1 {
+ 1
+ } else {
+ fib(n-1) + fib(n-2)
+ }
+}
+
+fn fib_cond(n : i64) -> i64 {
+ cond!(
+ ((n == 0) 1)
+ ((n == 1) 1)
+ (else (fib_cond(n-1) + fib_cond(n-2)))
+ )
+}
+
+fn main() {
+ assert_eq!(fact(3), fact_cond(3));
+ assert_eq!(fact(5), fact_cond(5));
+ assert_eq!(fib(5), fib_cond(5));
+ assert_eq!(fib(8), fib_cond(8));
+}
continue
}
+ // We want the compiler to depend on the proc_macro crate so that it is built and
+ // included in the end, but we don't want to actually use it in the compiler.
+ if toml.contains("name = \"rustc_driver\"") && krate == "proc_macro" {
+ continue
+ }
+
if !librs.contains(&format!("extern crate {}", krate)) {
println!("{} doesn't have `extern crate {}`, but Cargo.toml \
depends on it", libfile.display(), krate);
projects / rust.git / commitdiff