108 lines
2.5 KiB
Rust
108 lines
2.5 KiB
Rust
use std::map::HashMap;
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use syntax::ast;
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use syntax::codemap::{span};
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use syntax::visit;
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use syntax::print;
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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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move r
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}
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struct _indenter {
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_i: (),
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drop { debug!("<<"); }
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}
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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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fn indenter() -> _indenter {
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debug!(">>");
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_indenter(())
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}
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type flag = HashMap<~str, ()>;
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fn field_expr(f: ast::field) -> @ast::expr { return f.node.expr; }
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fn field_exprs(fields: ~[ast::field]) -> ~[@ast::expr] {
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let mut es = ~[];
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for fields.each |f| { es.push(f.node.expr); }
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return es;
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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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fn loop_query(b: ast::blk, p: fn@(ast::expr_) -> bool) -> bool {
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let rs = @mut false;
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let visit_expr =
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|e: @ast::expr, &&flag: @mut bool, v: visit::vt<@mut bool>| {
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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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| ast::expr_loop_body(*) => {}
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_ => visit::visit_expr(e, flag, v)
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}
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};
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let v = visit::mk_vt(@{visit_expr: visit_expr
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,.. *visit::default_visitor()});
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visit::visit_block(b, rs, v);
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return *rs;
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}
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fn has_nonlocal_exits(b: ast::blk) -> bool {
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do loop_query(b) |e| {
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match e {
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ast::expr_break(_) | ast::expr_again(_) => true,
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_ => false
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}
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}
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}
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fn may_break(b: ast::blk) -> bool {
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do loop_query(b) |e| {
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match e {
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ast::expr_break(_) => true,
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_ => false
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}
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}
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}
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fn local_rhs_span(l: @ast::local, def: span) -> span {
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match l.node.init {
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Some(i) => return i.expr.span,
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_ => return def
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}
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}
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fn is_main_name(path: syntax::ast_map::path) -> bool {
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vec::last(path) == syntax::ast_map::path_name(
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syntax::parse::token::special_idents::main
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)
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}
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fn pluralize(n: uint, s: ~str) -> ~str {
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if n == 1 { s }
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else { str::concat([s, ~"s"]) }
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}
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//
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// Local Variables:
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// mode: rust
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// fill-column: 78;
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// indent-tabs-mode: nil
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// c-basic-offset: 4
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// buffer-file-coding-system: utf-8-unix
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// End:
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//
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