89 lines
2.3 KiB
Rust
89 lines
2.3 KiB
Rust
import std::map::hashmap;
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import syntax::ast;
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import ast::{ty, pat};
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import syntax::codemap::{span};
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import syntax::visit;
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import 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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ret r;
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}
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class _indenter {
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let _i: ();
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new(_i: ()) { self._i = (); }
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drop { #debug["<<"]; }
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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 { ret 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| vec::push(es, f.node.expr); }
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ret 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 = {|e: @ast::expr, &&flag: @mut bool,
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v: visit::vt<@mut bool>|
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*flag |= p(e.node);
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alt 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(*) | 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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with *visit::default_visitor()});
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visit::visit_block(b, rs, v);
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ret *rs;
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}
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fn has_nonlocal_exits(b: ast::blk) -> bool {
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loop_query(b) {|e| alt e {
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ast::expr_break | ast::expr_cont { true }
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_ { false }}}
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}
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fn may_break(b: ast::blk) -> bool {
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loop_query(b) {|e| alt e {
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ast::expr_break { true }
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_ { false }}}
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}
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fn local_rhs_span(l: @ast::local, def: span) -> span {
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alt l.node.init { some(i) { ret i.expr.span; } _ { ret def; } }
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}
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fn is_main_name(path: syntax::ast_map::path) -> bool {
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// FIXME (#34): path should be a constrained type, so we know
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// the call to last doesn't fail.
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vec::last(path) == syntax::ast_map::path_name(@"main")
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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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