52 lines
1.4 KiB
Rust
52 lines
1.4 KiB
Rust
use syntax::ast::*;
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use syntax::ast_util;
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use syntax::ast_util::{path_to_ident, respan, walk_pat};
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use syntax::fold;
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use syntax::fold::*;
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use syntax::codemap::span;
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use std::map::hashmap;
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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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type pat_id_map = std::map::hashmap<ident, 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::DefMap, pat: @pat) -> pat_id_map {
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let map = std::map::uint_hash();
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do pat_bindings(dm, pat) |_bm, p_id, _s, n| {
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map.insert(path_to_ident(n), p_id);
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};
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return map;
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}
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fn pat_is_variant(dm: resolve::DefMap, pat: @pat) -> bool {
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match pat.node {
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pat_enum(_, _) => true,
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pat_ident(_, _, None) => match 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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_ => false
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}
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}
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fn pat_bindings(dm: resolve::DefMap, pat: @pat,
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it: fn(binding_mode, node_id, span, @path)) {
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do walk_pat(pat) |p| {
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match p.node {
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pat_ident(binding_mode, pth, _) if !pat_is_variant(dm, p) => {
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it(binding_mode, 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 pat_binding_ids(dm: resolve::DefMap, pat: @pat) -> ~[node_id] {
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let mut found = ~[];
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pat_bindings(dm, pat, |_bm, b_id, _sp, _pt| vec::push(found, b_id) );
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return found;
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}
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