2012-09-04 13:54:36 -05:00
|
|
|
use syntax::ast::*;
|
|
|
|
use syntax::ast_util;
|
|
|
|
use syntax::ast_util::{path_to_ident, respan, walk_pat};
|
|
|
|
use syntax::fold;
|
|
|
|
use syntax::fold::*;
|
|
|
|
use syntax::codemap::span;
|
2012-09-10 17:38:28 -05:00
|
|
|
use std::map::HashMap;
|
2012-01-14 18:05:07 -06:00
|
|
|
|
2012-09-12 19:06:36 -05:00
|
|
|
export pat_binding_ids, pat_bindings, pat_id_map, PatIdMap;
|
2012-11-13 00:10:15 -06:00
|
|
|
export pat_is_variant_or_struct, pat_is_binding, pat_is_binding_or_wild;
|
|
|
|
export pat_is_const;
|
2012-01-14 18:05:07 -06:00
|
|
|
|
2012-09-12 19:06:36 -05:00
|
|
|
type PatIdMap = std::map::HashMap<ident, node_id>;
|
2012-01-14 18:05:07 -06:00
|
|
|
|
|
|
|
// This is used because same-named variables in alternative patterns need to
|
|
|
|
// use the node_id of their namesake in the first pattern.
|
2012-09-12 19:06:36 -05:00
|
|
|
fn pat_id_map(dm: resolve::DefMap, pat: @pat) -> PatIdMap {
|
2012-09-19 17:13:04 -05:00
|
|
|
let map = std::map::HashMap();
|
2012-08-06 09:20:23 -05:00
|
|
|
do pat_bindings(dm, pat) |_bm, p_id, _s, n| {
|
2012-01-30 23:00:57 -06:00
|
|
|
map.insert(path_to_ident(n), p_id);
|
2012-01-14 18:05:07 -06:00
|
|
|
};
|
2012-08-01 19:30:05 -05:00
|
|
|
return map;
|
2012-01-14 18:05:07 -06:00
|
|
|
}
|
|
|
|
|
2012-10-30 17:53:06 -05:00
|
|
|
fn pat_is_variant_or_struct(dm: resolve::DefMap, pat: @pat) -> bool {
|
2012-08-06 14:34:08 -05:00
|
|
|
match pat.node {
|
2012-10-30 17:53:06 -05:00
|
|
|
pat_enum(_, _) | pat_ident(_, _, None) | pat_struct(*) => {
|
|
|
|
match dm.find(pat.id) {
|
|
|
|
Some(def_variant(*)) | Some(def_class(*)) => true,
|
|
|
|
_ => false
|
|
|
|
}
|
|
|
|
}
|
2012-08-03 21:59:04 -05:00
|
|
|
_ => false
|
2012-02-22 09:57:23 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2012-11-13 00:10:15 -06:00
|
|
|
fn pat_is_const(dm: resolve::DefMap, pat: &pat) -> bool {
|
|
|
|
match pat.node {
|
|
|
|
pat_ident(_, _, None) => {
|
|
|
|
match dm.find(pat.id) {
|
|
|
|
Some(def_const(*)) => true,
|
|
|
|
_ => false
|
|
|
|
}
|
|
|
|
}
|
|
|
|
_ => false
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
fn pat_is_binding(dm: resolve::DefMap, pat: @pat) -> bool {
|
|
|
|
match pat.node {
|
|
|
|
pat_ident(*) => {
|
|
|
|
!pat_is_variant_or_struct(dm, pat) &&
|
|
|
|
!pat_is_const(dm, pat)
|
|
|
|
}
|
|
|
|
_ => false
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2012-09-12 19:06:36 -05:00
|
|
|
fn pat_is_binding_or_wild(dm: resolve::DefMap, pat: @pat) -> bool {
|
|
|
|
match pat.node {
|
2012-11-13 00:10:15 -06:00
|
|
|
pat_ident(*) => pat_is_binding(dm, pat),
|
2012-09-12 19:06:36 -05:00
|
|
|
pat_wild => true,
|
|
|
|
_ => false
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2012-08-29 15:26:26 -05:00
|
|
|
fn pat_bindings(dm: resolve::DefMap, pat: @pat,
|
2012-08-06 09:20:23 -05:00
|
|
|
it: fn(binding_mode, node_id, span, @path)) {
|
2012-06-30 18:19:07 -05:00
|
|
|
do walk_pat(pat) |p| {
|
2012-08-06 14:34:08 -05:00
|
|
|
match p.node {
|
2012-11-13 00:10:15 -06:00
|
|
|
pat_ident(binding_mode, pth, _) if pat_is_binding(dm, p) => {
|
2012-08-06 09:20:23 -05:00
|
|
|
it(binding_mode, p.id, p.span, pth);
|
2012-02-22 09:57:23 -06:00
|
|
|
}
|
2012-08-03 21:59:04 -05:00
|
|
|
_ => {}
|
2012-02-22 09:57:23 -06:00
|
|
|
}
|
2012-01-14 18:05:07 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2012-08-29 15:26:26 -05:00
|
|
|
fn pat_binding_ids(dm: resolve::DefMap, pat: @pat) -> ~[node_id] {
|
2012-06-29 18:26:56 -05:00
|
|
|
let mut found = ~[];
|
2012-09-26 19:33:34 -05:00
|
|
|
pat_bindings(dm, pat, |_bm, b_id, _sp, _pt| found.push(b_id) );
|
2012-08-01 19:30:05 -05:00
|
|
|
return found;
|
2012-01-14 18:05:07 -06:00
|
|
|
}
|