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use middle::def::*;
use middle::ty;
use util::nodemap::FnvHashMap;
use syntax::ast;
use syntax::ast_util::{walk_pat};
use syntax::codemap::{Span, DUMMY_SP};
pub type PatIdMap = FnvHashMap<ast::Ident, ast::NodeId>;
pub fn pat_id_map(dm: &DefMap, pat: &ast::Pat) -> PatIdMap {
let mut map = FnvHashMap::new();
pat_bindings(dm, pat, |_bm, p_id, _s, path1| {
map.insert(path1.node, p_id);
});
map
}
pub fn pat_is_refutable(dm: &DefMap, pat: &ast::Pat) -> bool {
match pat.node {
ast::PatLit(_) | ast::PatRange(_, _) => true,
ast::PatEnum(_, _) |
ast::PatIdent(_, _, None) |
ast::PatStruct(..) => {
match dm.borrow().get(&pat.id) {
Some(&DefVariant(..)) => true,
_ => false
}
}
ast::PatVec(_, _, _) => true,
_ => false
}
}
pub fn pat_is_variant_or_struct(dm: &DefMap, pat: &ast::Pat) -> bool {
match pat.node {
ast::PatEnum(_, _) |
ast::PatIdent(_, _, None) |
ast::PatStruct(..) => {
match dm.borrow().get(&pat.id) {
Some(&DefVariant(..)) | Some(&DefStruct(..)) => true,
_ => false
}
}
_ => false
}
}
pub fn pat_is_const(dm: &DefMap, pat: &ast::Pat) -> bool {
match pat.node {
ast::PatIdent(_, _, None) | ast::PatEnum(..) => {
match dm.borrow().get(&pat.id) {
Some(&DefConst(..)) => true,
_ => false
}
}
_ => false
}
}
pub fn pat_is_binding(dm: &DefMap, pat: &ast::Pat) -> bool {
match pat.node {
ast::PatIdent(..) => {
!pat_is_variant_or_struct(dm, pat) &&
!pat_is_const(dm, pat)
}
_ => false
}
}
pub fn pat_is_binding_or_wild(dm: &DefMap, pat: &ast::Pat) -> bool {
match pat.node {
ast::PatIdent(..) => pat_is_binding(dm, pat),
ast::PatWild(_) => true,
_ => false
}
}
pub fn pat_bindings<I>(dm: &DefMap, pat: &ast::Pat, mut it: I) where
I: FnMut(ast::BindingMode, ast::NodeId, Span, &ast::SpannedIdent),
{
walk_pat(pat, |p| {
match p.node {
ast::PatIdent(binding_mode, ref pth, _) if pat_is_binding(dm, p) => {
it(binding_mode, p.id, p.span, pth);
}
_ => {}
}
true
});
}
pub fn pat_contains_bindings(dm: &DefMap, pat: &ast::Pat) -> bool {
let mut contains_bindings = false;
walk_pat(pat, |p| {
if pat_is_binding(dm, p) {
contains_bindings = true;
false
} else {
true
}
});
contains_bindings
}
pub fn simple_identifier<'a>(pat: &'a ast::Pat) -> Option<&'a ast::Ident> {
match pat.node {
ast::PatIdent(ast::BindByValue(_), ref path1, None) => {
Some(&path1.node)
}
_ => {
None
}
}
}
pub fn def_to_path(tcx: &ty::ctxt, id: ast::DefId) -> ast::Path {
ty::with_path(tcx, id, |path| ast::Path {
global: false,
segments: path.last().map(|elem| ast::PathSegment {
identifier: ast::Ident::new(elem.name()),
parameters: ast::PathParameters::none(),
}).into_iter().collect(),
span: DUMMY_SP,
})
}