739 lines
27 KiB
Rust
739 lines
27 KiB
Rust
import codemap::span;
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import ast::*;
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export ast_fold_precursor;
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export ast_fold;
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export default_ast_fold;
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export make_fold;
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export noop_fold_crate;
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export noop_fold_item;
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export noop_fold_expr;
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export noop_fold_pat;
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export noop_fold_mod;
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export noop_fold_ty;
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export noop_fold_block;
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export wrap;
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export fold_ty_param;
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export fold_ty_params;
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export fold_fn_decl;
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export extensions;
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iface ast_fold {
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fn fold_crate(crate) -> crate;
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fn fold_crate_directive(&&@crate_directive) -> @crate_directive;
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fn fold_view_item(&&@view_item) -> @view_item;
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fn fold_foreign_item(&&@foreign_item) -> @foreign_item;
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fn fold_item(&&@item) -> option<@item>;
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fn fold_class_item(&&@class_member) -> @class_member;
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fn fold_item_underscore(item_) -> item_;
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fn fold_method(&&@method) -> @method;
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fn fold_block(blk) -> blk;
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fn fold_stmt(&&@stmt) -> @stmt;
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fn fold_arm(arm) -> arm;
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fn fold_pat(&&@pat) -> @pat;
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fn fold_decl(&&@decl) -> @decl;
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fn fold_expr(&&@expr) -> @expr;
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fn fold_ty(&&@ty) -> @ty;
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fn fold_mod(_mod) -> _mod;
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fn fold_foreign_mod(foreign_mod) -> foreign_mod;
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fn fold_variant(variant) -> variant;
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fn fold_ident(&&ident) -> ident;
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fn fold_path(&&@path) -> @path;
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fn fold_local(&&@local) -> @local;
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fn map_exprs(fn@(&&@expr) -> @expr, ~[@expr]) -> ~[@expr];
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fn new_id(node_id) -> node_id;
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fn new_span(span) -> span;
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}
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// We may eventually want to be able to fold over type parameters, too
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type ast_fold_precursor = @{
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//unlike the others, item_ is non-trivial
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fold_crate: fn@(crate_, span, ast_fold) -> (crate_, span),
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fold_crate_directive: fn@(crate_directive_, span,
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ast_fold) -> (crate_directive_, span),
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fold_view_item: fn@(view_item_, ast_fold) -> view_item_,
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fold_foreign_item: fn@(&&@foreign_item, ast_fold) -> @foreign_item,
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fold_item: fn@(&&@item, ast_fold) -> option<@item>,
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fold_class_item: fn@(&&@class_member, ast_fold) -> @class_member,
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fold_item_underscore: fn@(item_, ast_fold) -> item_,
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fold_method: fn@(&&@method, ast_fold) -> @method,
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fold_block: fn@(blk_, span, ast_fold) -> (blk_, span),
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fold_stmt: fn@(stmt_, span, ast_fold) -> (stmt_, span),
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fold_arm: fn@(arm, ast_fold) -> arm,
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fold_pat: fn@(pat_, span, ast_fold) -> (pat_, span),
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fold_decl: fn@(decl_, span, ast_fold) -> (decl_, span),
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fold_expr: fn@(expr_, span, ast_fold) -> (expr_, span),
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fold_ty: fn@(ty_, span, ast_fold) -> (ty_, span),
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fold_mod: fn@(_mod, ast_fold) -> _mod,
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fold_foreign_mod: fn@(foreign_mod, ast_fold) -> foreign_mod,
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fold_variant: fn@(variant_, span, ast_fold) -> (variant_, span),
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fold_ident: fn@(&&ident, ast_fold) -> ident,
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fold_path: fn@(path, ast_fold) -> path,
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fold_local: fn@(local_, span, ast_fold) -> (local_, span),
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map_exprs: fn@(fn@(&&@expr) -> @expr, ~[@expr]) -> ~[@expr],
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new_id: fn@(node_id) -> node_id,
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new_span: fn@(span) -> span};
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/* some little folds that probably aren't useful to have in ast_fold itself*/
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//used in noop_fold_item and noop_fold_crate and noop_fold_crate_directive
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fn fold_meta_item_(&&mi: @meta_item, fld: ast_fold) -> @meta_item {
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ret @{node:
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alt mi.node {
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meta_word(id) { meta_word(fld.fold_ident(id)) }
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meta_list(id, mis) {
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let fold_meta_item = |x|fold_meta_item_(x, fld);
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meta_list(/* FIXME: (#2543) */ copy id,
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vec::map(mis, fold_meta_item))
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}
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meta_name_value(id, s) {
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meta_name_value(fld.fold_ident(id),
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/* FIXME (#2543) */ copy s)
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}
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},
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span: fld.new_span(mi.span)};
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}
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//used in noop_fold_item and noop_fold_crate
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fn fold_attribute_(at: attribute, fld: ast_fold) ->
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attribute {
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ret {node: {style: at.node.style,
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value: *fold_meta_item_(@at.node.value, fld),
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is_sugared_doc: at.node.is_sugared_doc },
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span: fld.new_span(at.span)};
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}
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//used in noop_fold_foreign_item and noop_fold_fn_decl
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fn fold_arg_(a: arg, fld: ast_fold) -> arg {
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ret {mode: a.mode,
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ty: fld.fold_ty(a.ty),
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ident: fld.fold_ident(a.ident),
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id: fld.new_id(a.id)};
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}
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//used in noop_fold_expr, and possibly elsewhere in the future
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fn fold_mac_(m: mac, fld: ast_fold) -> mac {
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ret {node:
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alt m.node {
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mac_invoc(pth, arg, body) {
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mac_invoc(fld.fold_path(pth),
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option::map(arg, |x| fld.fold_expr(x)), body)
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}
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mac_invoc_tt(pth, tt) { m.node }
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mac_embed_type(ty) { mac_embed_type(fld.fold_ty(ty)) }
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mac_embed_block(blk) { mac_embed_block(fld.fold_block(blk)) }
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mac_ellipsis { mac_ellipsis }
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mac_aq(_,_) { /* FIXME (#2543) */ copy m.node }
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mac_var(_) { /* FIXME (#2543) */ copy m.node }
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},
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span: fld.new_span(m.span)};
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}
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fn fold_fn_decl(decl: ast::fn_decl, fld: ast_fold) -> ast::fn_decl {
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ret {inputs: vec::map(decl.inputs, |x| fold_arg_(x, fld) ),
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output: fld.fold_ty(decl.output),
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purity: decl.purity,
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cf: decl.cf}
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}
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fn fold_ty_param_bound(tpb: ty_param_bound, fld: ast_fold) -> ty_param_bound {
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alt tpb {
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bound_copy | bound_send | bound_const | bound_owned { tpb }
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bound_trait(ty) { bound_trait(fld.fold_ty(ty)) }
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}
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}
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fn fold_ty_param(tp: ty_param, fld: ast_fold) -> ty_param {
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{ident: /* FIXME (#2543) */ copy tp.ident,
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id: fld.new_id(tp.id),
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bounds: @vec::map(*tp.bounds, |x| fold_ty_param_bound(x, fld) )}
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}
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fn fold_ty_params(tps: ~[ty_param], fld: ast_fold) -> ~[ty_param] {
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vec::map(tps, |x| fold_ty_param(x, fld) )
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}
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fn noop_fold_crate(c: crate_, fld: ast_fold) -> crate_ {
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let fold_meta_item = |x| fold_meta_item_(x, fld);
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let fold_attribute = |x| fold_attribute_(x, fld);
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ret {directives: vec::map(c.directives, |x| fld.fold_crate_directive(x)),
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module: fld.fold_mod(c.module),
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attrs: vec::map(c.attrs, fold_attribute),
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config: vec::map(c.config, fold_meta_item)};
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}
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fn noop_fold_crate_directive(cd: crate_directive_, fld: ast_fold) ->
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crate_directive_ {
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ret alt cd {
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cdir_src_mod(id, attrs) {
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cdir_src_mod(fld.fold_ident(id), /* FIXME (#2543) */ copy attrs)
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}
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cdir_dir_mod(id, cds, attrs) {
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cdir_dir_mod(fld.fold_ident(id),
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vec::map(cds, |x| fld.fold_crate_directive(x)),
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/* FIXME (#2543) */ copy attrs)
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}
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cdir_view_item(vi) { cdir_view_item(fld.fold_view_item(vi)) }
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cdir_syntax(_) { copy cd }
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}
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}
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fn noop_fold_view_item(vi: view_item_, _fld: ast_fold) -> view_item_ {
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ret /* FIXME (#2543) */ copy vi;
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}
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fn noop_fold_foreign_item(&&ni: @foreign_item, fld: ast_fold)
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-> @foreign_item {
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let fold_arg = |x| fold_arg_(x, fld);
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let fold_attribute = |x| fold_attribute_(x, fld);
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ret @{ident: fld.fold_ident(ni.ident),
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attrs: vec::map(ni.attrs, fold_attribute),
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node:
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alt ni.node {
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foreign_item_fn(fdec, typms) {
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foreign_item_fn({inputs: vec::map(fdec.inputs, fold_arg),
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output: fld.fold_ty(fdec.output),
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purity: fdec.purity,
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cf: fdec.cf},
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fold_ty_params(typms, fld))
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}
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},
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id: fld.new_id(ni.id),
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span: fld.new_span(ni.span)};
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}
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fn noop_fold_item(&&i: @item, fld: ast_fold) -> option<@item> {
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let fold_attribute = |x| fold_attribute_(x, fld);
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ret some(@{ident: fld.fold_ident(i.ident),
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attrs: vec::map(i.attrs, fold_attribute),
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id: fld.new_id(i.id),
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node: fld.fold_item_underscore(i.node),
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vis: i.vis,
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span: fld.new_span(i.span)});
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}
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fn noop_fold_class_item(&&ci: @class_member, fld: ast_fold)
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-> @class_member {
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@{node: alt ci.node {
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instance_var(ident, t, cm, id, p) {
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instance_var(/* FIXME (#2543) */ copy ident,
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fld.fold_ty(t), cm, id, p)
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}
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class_method(m) { class_method(fld.fold_method(m)) }
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},
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span: ci.span}
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}
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fn noop_fold_item_underscore(i: item_, fld: ast_fold) -> item_ {
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ret alt i {
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item_const(t, e) { item_const(fld.fold_ty(t), fld.fold_expr(e)) }
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item_fn(decl, typms, body) {
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item_fn(fold_fn_decl(decl, fld),
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fold_ty_params(typms, fld),
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fld.fold_block(body))
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}
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item_mod(m) { item_mod(fld.fold_mod(m)) }
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item_foreign_mod(nm) { item_foreign_mod(fld.fold_foreign_mod(nm)) }
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item_ty(t, typms) { item_ty(fld.fold_ty(t),
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fold_ty_params(typms, fld)) }
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item_enum(variants, typms) {
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item_enum(vec::map(variants, |x| fld.fold_variant(x)),
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fold_ty_params(typms, fld))
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}
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item_class(typms, traits, items, m_ctor, m_dtor) {
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let resulting_optional_constructor;
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alt m_ctor {
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none => {
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resulting_optional_constructor = none;
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}
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some(constructor) => {
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resulting_optional_constructor = some({
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node: {
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body: fld.fold_block(constructor.node.body),
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dec: fold_fn_decl(constructor.node.dec, fld),
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id: fld.new_id(constructor.node.id)
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with constructor.node
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}
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with constructor
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});
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}
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}
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let dtor = do option::map(m_dtor) |dtor| {
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let dtor_body = fld.fold_block(dtor.node.body);
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let dtor_id = fld.new_id(dtor.node.id);
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{node: {body: dtor_body,
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id: dtor_id with dtor.node}
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with dtor}};
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item_class(
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/* FIXME (#2543) */ copy typms,
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vec::map(traits, |p| fold_trait_ref(p, fld)),
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vec::map(items, |x| fld.fold_class_item(x)),
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resulting_optional_constructor,
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dtor)
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}
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item_impl(tps, ifce, ty, methods) {
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item_impl(fold_ty_params(tps, fld),
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ifce.map(|p| fold_trait_ref(p, fld)),
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fld.fold_ty(ty),
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vec::map(methods, |x| fld.fold_method(x)))
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}
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item_trait(tps, methods) {
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item_trait(fold_ty_params(tps, fld),
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/* FIXME (#2543) */ copy methods)
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}
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item_mac(m) {
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// FIXME #2888: we might actually want to do something here.
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item_mac(m)
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}
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};
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}
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fn fold_trait_ref(&&p: @trait_ref, fld: ast_fold) -> @trait_ref {
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@{path: fld.fold_path(p.path), ref_id: fld.new_id(p.ref_id),
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impl_id: fld.new_id(p.impl_id)}
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}
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fn noop_fold_method(&&m: @method, fld: ast_fold) -> @method {
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ret @{ident: fld.fold_ident(m.ident),
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attrs: /* FIXME (#2543) */ copy m.attrs,
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tps: fold_ty_params(m.tps, fld),
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decl: fold_fn_decl(m.decl, fld),
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body: fld.fold_block(m.body),
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id: fld.new_id(m.id),
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span: fld.new_span(m.span),
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self_id: fld.new_id(m.self_id),
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vis: m.vis};
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}
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fn noop_fold_block(b: blk_, fld: ast_fold) -> blk_ {
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ret {view_items: vec::map(b.view_items, |x| fld.fold_view_item(x)),
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stmts: vec::map(b.stmts, |x| fld.fold_stmt(x)),
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expr: option::map(b.expr, |x| fld.fold_expr(x)),
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id: fld.new_id(b.id),
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rules: b.rules};
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}
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fn noop_fold_stmt(s: stmt_, fld: ast_fold) -> stmt_ {
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ret alt s {
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stmt_decl(d, nid) { stmt_decl(fld.fold_decl(d), fld.new_id(nid)) }
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stmt_expr(e, nid) { stmt_expr(fld.fold_expr(e), fld.new_id(nid)) }
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stmt_semi(e, nid) { stmt_semi(fld.fold_expr(e), fld.new_id(nid)) }
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};
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}
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fn noop_fold_arm(a: arm, fld: ast_fold) -> arm {
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ret {pats: vec::map(a.pats, |x| fld.fold_pat(x)),
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guard: option::map(a.guard, |x| fld.fold_expr(x)),
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body: fld.fold_block(a.body)};
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}
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fn noop_fold_pat(p: pat_, fld: ast_fold) -> pat_ {
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ret alt p {
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pat_wild { pat_wild }
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pat_ident(pth, sub) {
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pat_ident(fld.fold_path(pth),
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option::map(sub, |x| fld.fold_pat(x)))
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}
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pat_lit(e) { pat_lit(fld.fold_expr(e)) }
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pat_enum(pth, pats) {
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pat_enum(fld.fold_path(pth), option::map(pats,
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|pats| vec::map(pats, |x| fld.fold_pat(x))))
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}
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pat_rec(fields, etc) {
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let mut fs = ~[];
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for fields.each |f| {
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vec::push(fs,
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{ident: /* FIXME (#2543) */ copy f.ident,
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pat: fld.fold_pat(f.pat)});
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}
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pat_rec(fs, etc)
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}
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pat_tup(elts) { pat_tup(vec::map(elts, |x| fld.fold_pat(x))) }
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pat_box(inner) { pat_box(fld.fold_pat(inner)) }
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pat_uniq(inner) { pat_uniq(fld.fold_pat(inner)) }
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pat_range(e1, e2) {
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pat_range(fld.fold_expr(e1), fld.fold_expr(e2))
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}
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};
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}
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fn noop_fold_decl(d: decl_, fld: ast_fold) -> decl_ {
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alt d {
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decl_local(ls) { decl_local(vec::map(ls, |x| fld.fold_local(x))) }
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decl_item(it) {
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alt fld.fold_item(it) {
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some(it_folded) { decl_item(it_folded) }
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none { decl_local(~[]) }
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}
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}
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}
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}
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fn wrap<T>(f: fn@(T, ast_fold) -> T)
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-> fn@(T, span, ast_fold) -> (T, span)
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{
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ret fn@(x: T, s: span, fld: ast_fold) -> (T, span) {
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(f(x, fld), s)
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}
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}
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fn noop_fold_expr(e: expr_, fld: ast_fold) -> expr_ {
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fn fold_field_(field: field, fld: ast_fold) -> field {
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ret {node:
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{mutbl: field.node.mutbl,
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ident: fld.fold_ident(field.node.ident),
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expr: fld.fold_expr(field.node.expr)},
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span: fld.new_span(field.span)};
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}
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let fold_field = |x| fold_field_(x, fld);
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let fold_mac = |x| fold_mac_(x, fld);
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ret alt e {
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expr_new(p, i, v) {
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expr_new(fld.fold_expr(p),
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fld.new_id(i),
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fld.fold_expr(v))
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}
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expr_vstore(e, v) {
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expr_vstore(fld.fold_expr(e), v)
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}
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expr_vec(exprs, mutt) {
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expr_vec(fld.map_exprs(|x| fld.fold_expr(x), exprs), mutt)
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}
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expr_rec(fields, maybe_expr) {
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expr_rec(vec::map(fields, fold_field),
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option::map(maybe_expr, |x| fld.fold_expr(x)))
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}
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expr_tup(elts) { expr_tup(vec::map(elts, |x| fld.fold_expr(x))) }
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expr_call(f, args, blk) {
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expr_call(fld.fold_expr(f),
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fld.map_exprs(|x| fld.fold_expr(x), args),
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blk)
|
|
}
|
|
expr_binary(binop, lhs, rhs) {
|
|
expr_binary(binop, fld.fold_expr(lhs), fld.fold_expr(rhs))
|
|
}
|
|
expr_unary(binop, ohs) { expr_unary(binop, fld.fold_expr(ohs)) }
|
|
expr_loop_body(f) { expr_loop_body(fld.fold_expr(f)) }
|
|
expr_do_body(f) { expr_do_body(fld.fold_expr(f)) }
|
|
expr_lit(_) { copy e }
|
|
expr_cast(expr, ty) { expr_cast(fld.fold_expr(expr), ty) }
|
|
expr_addr_of(m, ohs) { expr_addr_of(m, fld.fold_expr(ohs)) }
|
|
expr_if(cond, tr, fl) {
|
|
expr_if(fld.fold_expr(cond), fld.fold_block(tr),
|
|
option::map(fl, |x| fld.fold_expr(x)))
|
|
}
|
|
expr_while(cond, body) {
|
|
expr_while(fld.fold_expr(cond), fld.fold_block(body))
|
|
}
|
|
expr_loop(body) {
|
|
expr_loop(fld.fold_block(body))
|
|
}
|
|
expr_alt(expr, arms, mode) {
|
|
expr_alt(fld.fold_expr(expr),
|
|
vec::map(arms, |x| fld.fold_arm(x)), mode)
|
|
}
|
|
expr_fn(proto, decl, body, captures) {
|
|
expr_fn(proto, fold_fn_decl(decl, fld),
|
|
fld.fold_block(body),
|
|
@((*captures).map(|cap_item| {
|
|
@({id: fld.new_id((*cap_item).id)
|
|
with *cap_item})})))
|
|
}
|
|
expr_fn_block(decl, body, captures) {
|
|
expr_fn_block(fold_fn_decl(decl, fld), fld.fold_block(body),
|
|
@((*captures).map(|cap_item| {
|
|
@({id: fld.new_id((*cap_item).id)
|
|
with *cap_item})})))
|
|
}
|
|
expr_block(blk) { expr_block(fld.fold_block(blk)) }
|
|
expr_move(el, er) {
|
|
expr_move(fld.fold_expr(el), fld.fold_expr(er))
|
|
}
|
|
expr_copy(e) { expr_copy(fld.fold_expr(e)) }
|
|
expr_assign(el, er) {
|
|
expr_assign(fld.fold_expr(el), fld.fold_expr(er))
|
|
}
|
|
expr_swap(el, er) {
|
|
expr_swap(fld.fold_expr(el), fld.fold_expr(er))
|
|
}
|
|
expr_assign_op(op, el, er) {
|
|
expr_assign_op(op, fld.fold_expr(el), fld.fold_expr(er))
|
|
}
|
|
expr_field(el, id, tys) {
|
|
expr_field(fld.fold_expr(el), fld.fold_ident(id),
|
|
vec::map(tys, |x| fld.fold_ty(x)))
|
|
}
|
|
expr_index(el, er) {
|
|
expr_index(fld.fold_expr(el), fld.fold_expr(er))
|
|
}
|
|
expr_path(pth) { expr_path(fld.fold_path(pth)) }
|
|
expr_fail(e) { expr_fail(option::map(e, |x| fld.fold_expr(x))) }
|
|
expr_break | expr_again { copy e }
|
|
expr_ret(e) { expr_ret(option::map(e, |x| fld.fold_expr(x))) }
|
|
expr_log(i, lv, e) { expr_log(i, fld.fold_expr(lv),
|
|
fld.fold_expr(e)) }
|
|
expr_assert(e) { expr_assert(fld.fold_expr(e)) }
|
|
expr_mac(mac) { expr_mac(fold_mac(mac)) }
|
|
expr_struct(path, fields) {
|
|
expr_struct(fld.fold_path(path), vec::map(fields, fold_field))
|
|
}
|
|
}
|
|
}
|
|
|
|
fn noop_fold_ty(t: ty_, fld: ast_fold) -> ty_ {
|
|
let fold_mac = |x| fold_mac_(x, fld);
|
|
fn fold_mt(mt: mt, fld: ast_fold) -> mt {
|
|
{ty: fld.fold_ty(mt.ty), mutbl: mt.mutbl}
|
|
}
|
|
fn fold_field(f: ty_field, fld: ast_fold) -> ty_field {
|
|
{node: {ident: fld.fold_ident(f.node.ident),
|
|
mt: fold_mt(f.node.mt, fld)},
|
|
span: fld.new_span(f.span)}
|
|
}
|
|
alt t {
|
|
ty_nil | ty_bot | ty_infer {copy t}
|
|
ty_box(mt) {ty_box(fold_mt(mt, fld))}
|
|
ty_uniq(mt) {ty_uniq(fold_mt(mt, fld))}
|
|
ty_vec(mt) {ty_vec(fold_mt(mt, fld))}
|
|
ty_ptr(mt) {ty_ptr(fold_mt(mt, fld))}
|
|
ty_rptr(region, mt) {ty_rptr(region, fold_mt(mt, fld))}
|
|
ty_rec(fields) {ty_rec(vec::map(fields, |f| fold_field(f, fld)))}
|
|
ty_fn(proto, decl) {ty_fn(proto, fold_fn_decl(decl, fld))}
|
|
ty_tup(tys) {ty_tup(vec::map(tys, |ty| fld.fold_ty(ty)))}
|
|
ty_path(path, id) {ty_path(fld.fold_path(path), fld.new_id(id))}
|
|
ty_fixed_length(t, vs) {ty_fixed_length(fld.fold_ty(t), vs)}
|
|
ty_mac(mac) {ty_mac(fold_mac(mac))}
|
|
}
|
|
}
|
|
|
|
// ...nor do modules
|
|
fn noop_fold_mod(m: _mod, fld: ast_fold) -> _mod {
|
|
ret {view_items: vec::map(m.view_items, |x| fld.fold_view_item(x)),
|
|
items: vec::filter_map(m.items, |x| fld.fold_item(x))};
|
|
}
|
|
|
|
fn noop_fold_foreign_mod(nm: foreign_mod, fld: ast_fold) -> foreign_mod {
|
|
ret {view_items: vec::map(nm.view_items, |x| fld.fold_view_item(x)),
|
|
items: vec::map(nm.items, |x| fld.fold_foreign_item(x))}
|
|
}
|
|
|
|
fn noop_fold_variant(v: variant_, fld: ast_fold) -> variant_ {
|
|
fn fold_variant_arg_(va: variant_arg, fld: ast_fold) -> variant_arg {
|
|
ret {ty: fld.fold_ty(va.ty), id: fld.new_id(va.id)};
|
|
}
|
|
let fold_variant_arg = |x| fold_variant_arg_(x, fld);
|
|
let args = vec::map(v.args, fold_variant_arg);
|
|
|
|
let fold_attribute = |x| fold_attribute_(x, fld);
|
|
let attrs = vec::map(v.attrs, fold_attribute);
|
|
|
|
let de = alt v.disr_expr {
|
|
some(e) {some(fld.fold_expr(e))}
|
|
none {none}
|
|
};
|
|
ret {name: /* FIXME (#2543) */ copy v.name,
|
|
attrs: attrs,
|
|
args: args, id: fld.new_id(v.id),
|
|
disr_expr: de,
|
|
vis: v.vis};
|
|
}
|
|
|
|
fn noop_fold_ident(&&i: ident, _fld: ast_fold) -> ident {
|
|
ret /* FIXME (#2543) */ copy i;
|
|
}
|
|
|
|
fn noop_fold_path(&&p: path, fld: ast_fold) -> path {
|
|
ret {span: fld.new_span(p.span), global: p.global,
|
|
idents: vec::map(p.idents, |x| fld.fold_ident(x)),
|
|
rp: p.rp,
|
|
types: vec::map(p.types, |x| fld.fold_ty(x))};
|
|
}
|
|
|
|
fn noop_fold_local(l: local_, fld: ast_fold) -> local_ {
|
|
ret {is_mutbl: l.is_mutbl,
|
|
ty: fld.fold_ty(l.ty),
|
|
pat: fld.fold_pat(l.pat),
|
|
init:
|
|
alt l.init {
|
|
option::none::<initializer> { l.init }
|
|
option::some::<initializer>(init) {
|
|
option::some::<initializer>({op: init.op,
|
|
expr: fld.fold_expr(init.expr)})
|
|
}
|
|
},
|
|
id: fld.new_id(l.id)};
|
|
}
|
|
|
|
/* temporarily eta-expand because of a compiler bug with using `fn<T>` as a
|
|
value */
|
|
fn noop_map_exprs(f: fn@(&&@expr) -> @expr, es: ~[@expr]) -> ~[@expr] {
|
|
ret vec::map(es, f);
|
|
}
|
|
|
|
fn noop_id(i: node_id) -> node_id { ret i; }
|
|
|
|
fn noop_span(sp: span) -> span { ret sp; }
|
|
|
|
fn default_ast_fold() -> ast_fold_precursor {
|
|
ret @{fold_crate: wrap(noop_fold_crate),
|
|
fold_crate_directive: wrap(noop_fold_crate_directive),
|
|
fold_view_item: noop_fold_view_item,
|
|
fold_foreign_item: noop_fold_foreign_item,
|
|
fold_item: noop_fold_item,
|
|
fold_class_item: noop_fold_class_item,
|
|
fold_item_underscore: noop_fold_item_underscore,
|
|
fold_method: noop_fold_method,
|
|
fold_block: wrap(noop_fold_block),
|
|
fold_stmt: wrap(noop_fold_stmt),
|
|
fold_arm: noop_fold_arm,
|
|
fold_pat: wrap(noop_fold_pat),
|
|
fold_decl: wrap(noop_fold_decl),
|
|
fold_expr: wrap(noop_fold_expr),
|
|
fold_ty: wrap(noop_fold_ty),
|
|
fold_mod: noop_fold_mod,
|
|
fold_foreign_mod: noop_fold_foreign_mod,
|
|
fold_variant: wrap(noop_fold_variant),
|
|
fold_ident: noop_fold_ident,
|
|
fold_path: noop_fold_path,
|
|
fold_local: wrap(noop_fold_local),
|
|
map_exprs: noop_map_exprs,
|
|
new_id: noop_id,
|
|
new_span: noop_span};
|
|
}
|
|
|
|
impl of ast_fold for ast_fold_precursor {
|
|
/* naturally, a macro to write these would be nice */
|
|
fn fold_crate(c: crate) -> crate {
|
|
let (n, s) = self.fold_crate(c.node, c.span, self as ast_fold);
|
|
ret {node: n, span: self.new_span(s)};
|
|
}
|
|
fn fold_crate_directive(&&c: @crate_directive) -> @crate_directive {
|
|
let (n, s) = self.fold_crate_directive(c.node, c.span,
|
|
self as ast_fold);
|
|
ret @{node: n,
|
|
span: self.new_span(s)};
|
|
}
|
|
fn fold_view_item(&&x: @view_item) ->
|
|
@view_item {
|
|
ret @{node: self.fold_view_item(x.node, self as ast_fold),
|
|
attrs: vec::map(x.attrs, |a|
|
|
fold_attribute_(a, self as ast_fold)),
|
|
vis: x.vis,
|
|
span: self.new_span(x.span)};
|
|
}
|
|
fn fold_foreign_item(&&x: @foreign_item)
|
|
-> @foreign_item {
|
|
ret self.fold_foreign_item(x, self as ast_fold);
|
|
}
|
|
fn fold_item(&&i: @item) -> option<@item> {
|
|
ret self.fold_item(i, self as ast_fold);
|
|
}
|
|
fn fold_class_item(&&ci: @class_member) -> @class_member {
|
|
@{node: alt ci.node {
|
|
instance_var(nm, t, mt, id, p) {
|
|
instance_var(/* FIXME (#2543) */ copy nm,
|
|
(self as ast_fold).fold_ty(t), mt, id, p)
|
|
}
|
|
class_method(m) {
|
|
class_method(self.fold_method(m, self as ast_fold))
|
|
}
|
|
}, span: self.new_span(ci.span)}
|
|
}
|
|
fn fold_item_underscore(i: item_) ->
|
|
item_ {
|
|
ret self.fold_item_underscore(i, self as ast_fold);
|
|
}
|
|
fn fold_method(&&x: @method)
|
|
-> @method {
|
|
ret self.fold_method(x, self as ast_fold);
|
|
}
|
|
fn fold_block(x: blk) -> blk {
|
|
let (n, s) = self.fold_block(x.node, x.span, self as ast_fold);
|
|
ret {node: n, span: self.new_span(s)};
|
|
}
|
|
fn fold_stmt(&&x: @stmt) -> @stmt {
|
|
let (n, s) = self.fold_stmt(x.node, x.span, self as ast_fold);
|
|
ret @{node: n, span: self.new_span(s)};
|
|
}
|
|
fn fold_arm(x: arm) -> arm {
|
|
ret self.fold_arm(x, self as ast_fold);
|
|
}
|
|
fn fold_pat(&&x: @pat) -> @pat {
|
|
let (n, s) = self.fold_pat(x.node, x.span, self as ast_fold);
|
|
ret @{id: self.new_id(x.id),
|
|
node: n,
|
|
span: self.new_span(s)};
|
|
}
|
|
fn fold_decl(&&x: @decl) -> @decl {
|
|
let (n, s) = self.fold_decl(x.node, x.span, self as ast_fold);
|
|
ret @{node: n, span: self.new_span(s)};
|
|
}
|
|
fn fold_expr(&&x: @expr) -> @expr {
|
|
let (n, s) = self.fold_expr(x.node, x.span, self as ast_fold);
|
|
ret @{id: self.new_id(x.id),
|
|
callee_id: self.new_id(x.callee_id),
|
|
node: n,
|
|
span: self.new_span(s)};
|
|
}
|
|
fn fold_ty(&&x: @ty) -> @ty {
|
|
let (n, s) = self.fold_ty(x.node, x.span, self as ast_fold);
|
|
ret @{id: self.new_id(x.id), node: n, span: self.new_span(s)};
|
|
}
|
|
fn fold_mod(x: _mod) -> _mod {
|
|
ret self.fold_mod(x, self as ast_fold);
|
|
}
|
|
fn fold_foreign_mod(x: foreign_mod) ->
|
|
foreign_mod {
|
|
ret self.fold_foreign_mod(x, self as ast_fold);
|
|
}
|
|
fn fold_variant(x: variant) ->
|
|
variant {
|
|
let (n, s) = self.fold_variant(x.node, x.span, self as ast_fold);
|
|
ret {node: n, span: self.new_span(s)};
|
|
}
|
|
fn fold_ident(&&x: ident) -> ident {
|
|
ret self.fold_ident(x, self as ast_fold);
|
|
}
|
|
fn fold_path(&&x: @path) -> @path {
|
|
@self.fold_path(*x, self as ast_fold)
|
|
}
|
|
fn fold_local(&&x: @local) -> @local {
|
|
let (n, s) = self.fold_local(x.node, x.span, self as ast_fold);
|
|
ret @{node: n, span: self.new_span(s)};
|
|
}
|
|
fn map_exprs(f: fn@(&&@expr) -> @expr, e: ~[@expr]) -> ~[@expr] {
|
|
self.map_exprs(f, e)
|
|
}
|
|
fn new_id(node_id: ast::node_id) -> node_id {
|
|
self.new_id(node_id)
|
|
}
|
|
fn new_span(span: span) -> span {
|
|
self.new_span(span)
|
|
}
|
|
}
|
|
|
|
impl extensions for ast_fold {
|
|
fn fold_attributes(attrs: ~[attribute]) -> ~[attribute] {
|
|
attrs.map(|x| fold_attribute_(x, self))
|
|
}
|
|
}
|
|
|
|
fn make_fold(afp: ast_fold_precursor) -> ast_fold {
|
|
afp as ast_fold
|
|
}
|
|
|
|
//
|
|
// Local Variables:
|
|
// mode: rust
|
|
// fill-column: 78;
|
|
// indent-tabs-mode: nil
|
|
// c-basic-offset: 4
|
|
// buffer-file-coding-system: utf-8-unix
|
|
// End:
|
|
//
|