115 lines
3.3 KiB
Rust
115 lines
3.3 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use syntax::ast;
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use syntax::codemap::{span};
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use syntax::oldvisit;
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use std::hashmap::HashSet;
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use extra;
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pub fn time<T>(do_it: bool, what: ~str, thunk: &fn() -> T) -> T {
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if !do_it { return thunk(); }
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let start = extra::time::precise_time_s();
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let rv = thunk();
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let end = extra::time::precise_time_s();
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printfln!("time: %3.3f s\t%s", end - start, what);
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rv
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}
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pub fn indent<R>(op: &fn() -> R) -> R {
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// Use in conjunction with the log post-processor like `src/etc/indenter`
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// to make debug output more readable.
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debug!(">>");
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let r = op();
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debug!("<< (Result = %?)", r);
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r
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}
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pub struct _indenter {
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_i: (),
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}
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impl Drop for _indenter {
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fn drop(&self) { debug!("<<"); }
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}
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pub fn _indenter(_i: ()) -> _indenter {
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_indenter {
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_i: ()
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}
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}
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pub fn indenter() -> _indenter {
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debug!(">>");
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_indenter(())
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}
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pub fn field_expr(f: ast::Field) -> @ast::expr { return f.expr; }
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pub fn field_exprs(fields: ~[ast::Field]) -> ~[@ast::expr] {
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fields.map(|f| f.expr)
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}
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// Takes a predicate p, returns true iff p is true for any subexpressions
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// of b -- skipping any inner loops (loop, while, loop_body)
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pub fn loop_query(b: &ast::Block, p: @fn(&ast::expr_) -> bool) -> bool {
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let rs = @mut false;
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let visit_expr: @fn(@ast::expr,
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(@mut bool,
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oldvisit::vt<@mut bool>)) = |e, (flag, v)| {
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*flag |= p(&e.node);
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match e.node {
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// Skip inner loops, since a break in the inner loop isn't a
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// break inside the outer loop
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ast::expr_loop(*) | ast::expr_while(*) => {}
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_ => oldvisit::visit_expr(e, (flag, v))
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}
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};
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let v = oldvisit::mk_vt(@oldvisit::Visitor {
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visit_expr: visit_expr,
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.. *oldvisit::default_visitor()});
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oldvisit::visit_block(b, (rs, v));
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return *rs;
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}
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// Takes a predicate p, returns true iff p is true for any subexpressions
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// of b -- skipping any inner loops (loop, while, loop_body)
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pub fn block_query(b: &ast::Block, p: @fn(@ast::expr) -> bool) -> bool {
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let rs = @mut false;
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let visit_expr: @fn(@ast::expr,
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(@mut bool,
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oldvisit::vt<@mut bool>)) = |e, (flag, v)| {
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*flag |= p(e);
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oldvisit::visit_expr(e, (flag, v))
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};
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let v = oldvisit::mk_vt(@oldvisit::Visitor{
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visit_expr: visit_expr,
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.. *oldvisit::default_visitor()});
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oldvisit::visit_block(b, (rs, v));
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return *rs;
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}
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pub fn local_rhs_span(l: @ast::Local, def: span) -> span {
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match l.init {
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Some(i) => return i.span,
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_ => return def
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}
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}
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pub fn pluralize(n: uint, s: ~str) -> ~str {
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if n == 1 { s }
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else { fmt!("%ss", s) }
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}
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// A set of node IDs (used to keep track of which node IDs are for statements)
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pub type stmt_set = @mut HashSet<ast::NodeId>;
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