c9375fed8d
This required changing almost all users of hashmaps to import the hashmap interface first. The `size` member in the hashmap structure was renamed to `count` to work around a name conflict.
72 lines
2.0 KiB
Rust
72 lines
2.0 KiB
Rust
import syntax::ast::*;
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import syntax::ast_util;
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import syntax::ast_util::respan;
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import syntax::fold;
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import syntax::fold::*;
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import syntax::codemap::span;
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import std::map::hashmap;
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export walk_pat;
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export pat_binding_ids, pat_bindings, pat_id_map;
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export pat_is_variant;
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export path_to_ident;
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type pat_id_map = std::map::hashmap<str, node_id>;
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// This is used because same-named variables in alternative patterns need to
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// use the node_id of their namesake in the first pattern.
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fn pat_id_map(dm: resolve::def_map, pat: @pat) -> pat_id_map {
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let map = std::map::new_str_hash();
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pat_bindings(dm, pat) {|p_id, _s, n|
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map.insert(path_to_ident(n), p_id);
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};
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ret map;
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}
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fn pat_is_variant(dm: resolve::def_map, pat: @pat) -> bool {
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alt pat.node {
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pat_enum(_, _) { true }
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pat_ident(_, none) {
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alt dm.find(pat.id) {
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some(def_variant(_, _)) { true }
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_ { false }
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}
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}
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_ { false }
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}
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}
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// This does *not* normalize. The pattern should be already normalized
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// if you want to get a normalized pattern out of it.
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// Could return a constrained type in order to express that (future work)
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fn pat_bindings(dm: resolve::def_map, pat: @pat,
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it: fn(node_id, span, @path)) {
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walk_pat(pat) {|p|
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alt p.node {
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pat_ident(pth, _) if !pat_is_variant(dm, p) {
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it(p.id, p.span, pth);
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}
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_ {}
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}
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}
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}
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fn walk_pat(pat: @pat, it: fn(@pat)) {
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it(pat);
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alt pat.node {
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pat_ident(pth, some(p)) { walk_pat(p, it); }
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pat_rec(fields, _) { for f in fields { walk_pat(f.pat, it); } }
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pat_enum(_, s) | pat_tup(s) { for p in s { walk_pat(p, it); } }
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pat_box(s) | pat_uniq(s) { walk_pat(s, it); }
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pat_wild | pat_lit(_) | pat_range(_, _) | pat_ident(_, none) {}
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}
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}
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fn pat_binding_ids(dm: resolve::def_map, pat: @pat) -> [node_id] {
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let found = [];
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pat_bindings(dm, pat) {|b_id, _sp, _pt| found += [b_id]; };
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ret found;
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}
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fn path_to_ident(p: @path) -> ident { vec::last_total(p.node.idents) }
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