830 lines
29 KiB
Rust
830 lines
29 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use core::prelude::*;
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use ast::*;
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use ast;
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use codemap::span;
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use core::option;
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use core::vec;
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pub trait ast_fold {
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fn fold_crate(crate) -> crate;
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fn fold_view_item(&&v: @view_item) -> @view_item;
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fn fold_foreign_item(&&v: @foreign_item) -> @foreign_item;
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fn fold_item(&&v: @item) -> Option<@item>;
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fn fold_struct_field(&&v: @struct_field) -> @struct_field;
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fn fold_item_underscore(item_) -> item_;
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fn fold_method(&&v: @method) -> @method;
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fn fold_block(blk) -> blk;
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fn fold_stmt(&&v: @stmt) -> @stmt;
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fn fold_arm(arm) -> arm;
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fn fold_pat(&&v: @pat) -> @pat;
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fn fold_decl(&&v: @decl) -> @decl;
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fn fold_expr(&&v: @expr) -> @expr;
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fn fold_ty(&&v: @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(&&v: ident) -> ident;
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fn fold_path(&&v: @path) -> @path;
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fn fold_local(&&v: @local) -> @local;
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fn map_exprs(fn@(&&v: @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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pub struct AstFoldFns {
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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_view_item: fn@(view_item_, ast_fold) -> view_item_,
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fold_foreign_item: fn@(&&v: @foreign_item, ast_fold) -> @foreign_item,
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fold_item: fn@(&&v: @item, ast_fold) -> Option<@item>,
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fold_struct_field: fn@(&&v: @struct_field, ast_fold) -> @struct_field,
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fold_item_underscore: fn@(item_, ast_fold) -> item_,
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fold_method: fn@(&&v: @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@(&&v: 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@(&&v: @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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}
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pub type ast_fold_fns = @AstFoldFns;
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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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@spanned {
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node:
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match mi.node {
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meta_word(ref id) => meta_word((*id)),
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meta_list(ref id, ref 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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mis.map(|e| fold_meta_item(*e)))
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}
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meta_name_value(ref id, s) => {
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meta_name_value((*id), /* 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) -> attribute {
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spanned {
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node: ast::attribute_ {
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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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},
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span: fld.new_span(at.span),
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}
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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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ast::arg {
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mode: a.mode,
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is_mutbl: a.is_mutbl,
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ty: fld.fold_ty(a.ty),
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pat: fld.fold_pat(a.pat),
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id: fld.new_id(a.id),
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}
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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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spanned { node: match m.node {
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mac_invoc_tt(*) => m.node,
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},
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span: fld.new_span(m.span) }
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}
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pub fn fold_fn_decl(decl: ast::fn_decl, fld: ast_fold) -> ast::fn_decl {
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ast::fn_decl {
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inputs: decl.inputs.map(|x| fold_arg_(*x, fld)),
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output: fld.fold_ty(decl.output),
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cf: decl.cf,
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}
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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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match tpb {
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TraitTyParamBound(ty) => TraitTyParamBound(fld.fold_ty(ty)),
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RegionTyParamBound => RegionTyParamBound
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}
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}
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pub fn fold_ty_param(tp: ty_param, fld: ast_fold) -> ty_param {
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ast::ty_param { ident: /* FIXME (#2543) */ copy tp.ident,
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id: fld.new_id(tp.id),
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bounds: @tp.bounds.map(|x| fold_ty_param_bound(*x, fld) )}
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}
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pub fn fold_ty_params(tps: ~[ty_param], fld: ast_fold) -> ~[ty_param] {
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tps.map(|x| fold_ty_param(*x, fld))
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}
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pub 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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crate_ {
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module: fld.fold_mod(c.module),
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attrs: c.attrs.map(|x| fold_attribute(*x)),
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config: c.config.map(|x| fold_meta_item(*x)),
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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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return /* 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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@ast::foreign_item {
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ident: fld.fold_ident(ni.ident),
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attrs: vec::map(ni.attrs, |x| fold_attribute(*x)),
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node:
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match ni.node {
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foreign_item_fn(fdec, purity, typms) => {
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foreign_item_fn(
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ast::fn_decl {
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inputs: fdec.inputs.map(|a| fold_arg(*a)),
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output: fld.fold_ty(fdec.output),
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cf: fdec.cf,
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},
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purity,
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fold_ty_params(typms, fld))
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}
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foreign_item_const(t) => {
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foreign_item_const(fld.fold_ty(t))
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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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vis: ni.vis,
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}
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}
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pub 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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Some(@ast::item { ident: fld.fold_ident(i.ident),
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attrs: i.attrs.map(|e| fold_attribute(*e)),
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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_struct_field(&&sf: @struct_field, fld: ast_fold)
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-> @struct_field {
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@spanned { node: ast::struct_field_ { kind: copy sf.node.kind,
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id: sf.node.id,
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ty: fld.fold_ty(sf.node.ty) },
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span: sf.span }
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}
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pub fn noop_fold_item_underscore(i: item_, fld: ast_fold) -> item_ {
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match 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(ref decl, purity, ref typms, ref body) => {
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item_fn(fold_fn_decl(/* FIXME (#2543) */ copy *decl, fld),
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purity,
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fold_ty_params(/* FIXME (#2543) */ copy *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(ref enum_definition, ref typms) => {
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item_enum(ast::enum_def(ast::enum_def_ {
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variants: enum_definition.variants.map(
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|x| fld.fold_variant(*x)),
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common: enum_definition.common.map(
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|x| fold_struct_def(*x, fld)),
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}), fold_ty_params(/* FIXME (#2543) */ copy *typms, fld))
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}
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item_struct(ref struct_def, ref typms) => {
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let struct_def = fold_struct_def(
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/* FIXME (#2543) */ copy *struct_def,
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fld);
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item_struct(struct_def, /* FIXME (#2543) */ copy *typms)
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}
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item_impl(ref tps, ifce, ty, ref methods) => {
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item_impl(fold_ty_params(/* FIXME (#2543) */ copy *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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methods.map(|x| fld.fold_method(*x)))
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}
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item_trait(ref tps, ref traits, ref methods) => {
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let methods = do methods.map |method| {
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match *method {
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required(*) => copy *method,
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provided(method) => provided(fld.fold_method(method))
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}
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};
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item_trait(fold_ty_params(/* FIXME (#2543) */ copy *tps, fld),
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traits.map(|p| fold_trait_ref(*p, fld)),
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methods)
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}
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item_mac(ref 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_struct_def(struct_def: @ast::struct_def, fld: ast_fold)
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-> @ast::struct_def {
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let dtor = do option::map(&struct_def.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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spanned { node: ast::struct_dtor_ { body: dtor_body,
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id: dtor_id,
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.. dtor.node},
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span: dtor.span }
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};
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@ast::struct_def {
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fields: struct_def.fields.map(|f| fold_struct_field(*f, fld)),
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dtor: dtor,
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ctor_id: struct_def.ctor_id.map(|cid| fld.new_id(*cid)),
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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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@ast::trait_ref {
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path: fld.fold_path(p.path),
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ref_id: fld.new_id(p.ref_id),
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}
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}
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fn fold_struct_field(&&f: @struct_field, fld: ast_fold) -> @struct_field {
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@spanned { node: ast::struct_field_ { kind: copy f.node.kind,
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id: fld.new_id(f.node.id),
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ty: fld.fold_ty(f.node.ty) },
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span: fld.new_span(f.span) }
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}
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fn noop_fold_method(&&m: @method, fld: ast_fold) -> @method {
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@ast::method {
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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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self_ty: m.self_ty,
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purity: m.purity,
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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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}
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pub fn noop_fold_block(b: blk_, fld: ast_fold) -> blk_ {
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ast::blk_ {
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view_items: b.view_items.map(|x| fld.fold_view_item(*x)),
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stmts: b.stmts.map(|x| fld.fold_stmt(*x)),
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expr: b.expr.map(|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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}
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fn noop_fold_stmt(s: stmt_, fld: ast_fold) -> stmt_ {
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let fold_mac = |x| fold_mac_(x, fld);
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return match 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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stmt_mac(ref mac, semi) => stmt_mac(fold_mac((*mac)), semi)
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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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arm {
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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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}
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pub fn noop_fold_pat(p: pat_, fld: ast_fold) -> pat_ {
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return match p {
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pat_wild => pat_wild,
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pat_ident(binding_mode, pth, sub) => {
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pat_ident(binding_mode,
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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 fs = do fields.map |f| {
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ast::field_pat {
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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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};
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pat_rec(fs, etc)
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}
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pat_struct(pth, fields, etc) => {
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let pth_ = fld.fold_path(pth);
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let fs = do fields.map |f| {
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ast::field_pat {
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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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};
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pat_struct(pth_, 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_region(inner) => pat_region(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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pat_vec(elts, tail) => pat_vec(
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vec::map(elts, |x| fld.fold_pat(*x)),
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option::map(&tail, |tail| fld.fold_pat(*tail))
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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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match 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) => match 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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pub 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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return 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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pub 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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spanned {
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node: ast::field_ {
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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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},
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span: fld.new_span(field.span),
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}
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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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return match e {
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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) => {
|
|
expr_vec(fld.map_exprs(|x| fld.fold_expr(x), exprs), mutt)
|
|
}
|
|
expr_repeat(expr, count, mutt) =>
|
|
expr_repeat(fld.fold_expr(expr), fld.fold_expr(count), mutt),
|
|
expr_rec(ref fields, maybe_expr) => {
|
|
expr_rec(vec::map((*fields), |x| fold_field(*x)),
|
|
option::map(&maybe_expr, |x| fld.fold_expr(*x)))
|
|
}
|
|
expr_tup(elts) => expr_tup(vec::map(elts, |x| fld.fold_expr(*x))),
|
|
expr_call(f, args, blk) => {
|
|
expr_call(fld.fold_expr(f),
|
|
fld.map_exprs(|x| fld.fold_expr(x), args),
|
|
blk)
|
|
}
|
|
expr_method_call(f, i, tps, args, blk) => {
|
|
expr_method_call(fld.fold_expr(f),
|
|
fld.fold_ident(i),
|
|
vec::map(tps, |x| fld.fold_ty(*x)),
|
|
fld.map_exprs(|x| fld.fold_expr(x), args),
|
|
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, ref tr, fl) => {
|
|
expr_if(fld.fold_expr(cond), fld.fold_block((*tr)),
|
|
option::map(&fl, |x| fld.fold_expr(*x)))
|
|
}
|
|
expr_while(cond, ref body) => {
|
|
expr_while(fld.fold_expr(cond), fld.fold_block((*body)))
|
|
}
|
|
expr_loop(ref body, opt_ident) => {
|
|
expr_loop(fld.fold_block((*body)),
|
|
option::map(&opt_ident, |x| fld.fold_ident(*x)))
|
|
}
|
|
expr_match(expr, ref arms) => {
|
|
expr_match(fld.fold_expr(expr),
|
|
vec::map((*arms), |x| fld.fold_arm(*x)))
|
|
}
|
|
expr_fn(proto, ref decl, ref body, _) => {
|
|
expr_fn(proto,
|
|
fold_fn_decl(/* FIXME (#2543) */ copy *decl, fld),
|
|
fld.fold_block(*body),
|
|
@())
|
|
}
|
|
expr_fn_block(ref decl, ref body) => {
|
|
expr_fn_block(fold_fn_decl(/* FIXME (#2543) */ copy *decl, fld),
|
|
fld.fold_block(*body))
|
|
}
|
|
expr_block(ref blk) => expr_block(fld.fold_block((*blk))),
|
|
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_break(opt_ident) =>
|
|
expr_break(option::map(&opt_ident, |x| fld.fold_ident(*x))),
|
|
expr_again(opt_ident) =>
|
|
expr_again(option::map(&opt_ident, |x| fld.fold_ident(*x))),
|
|
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(ref mac) => expr_mac(fold_mac((*mac))),
|
|
expr_struct(path, ref fields, maybe_expr) => {
|
|
expr_struct(fld.fold_path(path),
|
|
vec::map((*fields), |x| fold_field(*x)),
|
|
option::map(&maybe_expr, |x| fld.fold_expr(*x)))
|
|
},
|
|
expr_paren(ex) => expr_paren(fld.fold_expr(ex))
|
|
}
|
|
}
|
|
|
|
pub 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 {
|
|
mt { ty: fld.fold_ty(mt.ty), mutbl: mt.mutbl }
|
|
}
|
|
fn fold_field(f: ty_field, fld: ast_fold) -> ty_field {
|
|
spanned {
|
|
node: ast::ty_field_ {
|
|
ident: fld.fold_ident(f.node.ident),
|
|
mt: fold_mt(f.node.mt, fld),
|
|
},
|
|
span: fld.new_span(f.span),
|
|
}
|
|
}
|
|
match 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(ref fields) =>
|
|
ty_rec(vec::map((*fields), |f| fold_field(*f, fld))),
|
|
ty_closure(f) =>
|
|
ty_closure(@TyClosure {
|
|
sigil: f.sigil,
|
|
purity: f.purity,
|
|
region: f.region,
|
|
onceness: f.onceness,
|
|
decl: fold_fn_decl(f.decl, fld)
|
|
}),
|
|
ty_bare_fn(f) =>
|
|
ty_bare_fn(@TyBareFn {
|
|
purity: f.purity,
|
|
abi: f.abi,
|
|
decl: fold_fn_decl(f.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_vec(mt, vs) =>
|
|
ty_fixed_length_vec(fold_mt(mt, fld), vs),
|
|
ty_mac(ref mac) => ty_mac(fold_mac((*mac)))
|
|
}
|
|
}
|
|
|
|
// ...nor do modules
|
|
pub fn noop_fold_mod(m: _mod, fld: ast_fold) -> _mod {
|
|
ast::_mod {
|
|
view_items: vec::map(m.view_items, |x| fld.fold_view_item(*x)),
|
|
items: vec::filter_mapped(m.items, |x| fld.fold_item(*x)),
|
|
}
|
|
}
|
|
|
|
fn noop_fold_foreign_mod(nm: foreign_mod, fld: ast_fold) -> foreign_mod {
|
|
ast::foreign_mod {
|
|
sort: nm.sort,
|
|
abi: nm.abi,
|
|
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 {
|
|
ast::variant_arg { ty: fld.fold_ty(va.ty), id: fld.new_id(va.id) }
|
|
}
|
|
let fold_variant_arg = |x| fold_variant_arg_(x, fld);
|
|
|
|
let kind;
|
|
match v.kind {
|
|
tuple_variant_kind(variant_args) =>
|
|
kind = tuple_variant_kind(vec::map(variant_args,
|
|
|x| fold_variant_arg(*x))),
|
|
struct_variant_kind(struct_def) => {
|
|
let dtor = do option::map(&struct_def.dtor) |dtor| {
|
|
let dtor_body = fld.fold_block(dtor.node.body);
|
|
let dtor_id = fld.new_id(dtor.node.id);
|
|
spanned { node: ast::struct_dtor_ { body: dtor_body,
|
|
id: dtor_id,
|
|
.. dtor.node},
|
|
.. *dtor }
|
|
};
|
|
kind = struct_variant_kind(@ast::struct_def {
|
|
fields: vec::map(struct_def.fields,
|
|
|f| fld.fold_struct_field(*f)),
|
|
dtor: dtor,
|
|
ctor_id: option::map(&struct_def.ctor_id, |c| fld.new_id(*c))
|
|
})
|
|
}
|
|
|
|
enum_variant_kind(ref enum_definition) => {
|
|
let variants = vec::map((*enum_definition).variants,
|
|
|x| fld.fold_variant(*x));
|
|
let common = option::map(&(*enum_definition).common,
|
|
|x| fold_struct_def(*x, fld));
|
|
kind = enum_variant_kind(
|
|
ast::enum_def(ast::enum_def_ {
|
|
variants: variants,
|
|
common: common
|
|
})
|
|
);
|
|
}
|
|
}
|
|
|
|
let fold_attribute = |x| fold_attribute_(x, fld);
|
|
let attrs = vec::map(v.attrs, |x| fold_attribute(*x));
|
|
|
|
let de = match v.disr_expr {
|
|
Some(e) => Some(fld.fold_expr(e)),
|
|
None => None
|
|
};
|
|
ast::variant_ {
|
|
name: /* FIXME (#2543) */ copy v.name,
|
|
attrs: attrs,
|
|
kind: kind,
|
|
id: fld.new_id(v.id),
|
|
disr_expr: de,
|
|
vis: v.vis,
|
|
}
|
|
}
|
|
|
|
fn noop_fold_ident(&&i: ident, _fld: ast_fold) -> ident {
|
|
return /* FIXME (#2543) */ copy i;
|
|
}
|
|
|
|
fn noop_fold_path(&&p: path, fld: ast_fold) -> path {
|
|
ast::path { span: fld.new_span(p.span),
|
|
global: p.global,
|
|
idents: p.idents.map(|x| fld.fold_ident(*x)),
|
|
rp: p.rp,
|
|
types: p.types.map(|x| fld.fold_ty(*x)) }
|
|
}
|
|
|
|
fn noop_fold_local(l: local_, fld: ast_fold) -> local_ {
|
|
local_ {
|
|
is_mutbl: l.is_mutbl,
|
|
ty: fld.fold_ty(l.ty),
|
|
pat: fld.fold_pat(l.pat),
|
|
init: l.init.map(|e| fld.fold_expr(*e)),
|
|
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@(&&v: @expr) -> @expr, es: ~[@expr]) -> ~[@expr] {
|
|
return vec::map(es, |x| f(*x));
|
|
}
|
|
|
|
fn noop_id(i: node_id) -> node_id { return i; }
|
|
|
|
fn noop_span(sp: span) -> span { return sp; }
|
|
|
|
pub fn default_ast_fold() -> ast_fold_fns {
|
|
return @AstFoldFns {fold_crate: wrap(noop_fold_crate),
|
|
fold_view_item: noop_fold_view_item,
|
|
fold_foreign_item: noop_fold_foreign_item,
|
|
fold_item: noop_fold_item,
|
|
fold_struct_field: noop_fold_struct_field,
|
|
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};
|
|
}
|
|
|
|
pub impl ast_fold for ast_fold_fns {
|
|
/* 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);
|
|
spanned { node: n, span: (self.new_span)(s) }
|
|
}
|
|
fn fold_view_item(&&x: @view_item) ->
|
|
@view_item {
|
|
@ast::view_item {
|
|
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 {
|
|
return (self.fold_foreign_item)(x, self as ast_fold);
|
|
}
|
|
fn fold_item(&&i: @item) -> Option<@item> {
|
|
return (self.fold_item)(i, self as ast_fold);
|
|
}
|
|
fn fold_struct_field(&&sf: @struct_field) -> @struct_field {
|
|
@spanned {
|
|
node: ast::struct_field_ {
|
|
kind: copy sf.node.kind,
|
|
id: sf.node.id,
|
|
ty: (self as ast_fold).fold_ty(sf.node.ty),
|
|
},
|
|
span: (self.new_span)(sf.span),
|
|
}
|
|
}
|
|
fn fold_item_underscore(i: item_) ->
|
|
item_ {
|
|
return (self.fold_item_underscore)(i, self as ast_fold);
|
|
}
|
|
fn fold_method(&&x: @method)
|
|
-> @method {
|
|
return (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);
|
|
spanned { 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);
|
|
@spanned { node: n, span: (self.new_span)(s) }
|
|
}
|
|
fn fold_arm(x: arm) -> arm {
|
|
return (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);
|
|
@pat {
|
|
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);
|
|
@spanned { 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);
|
|
@expr {
|
|
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);
|
|
@Ty {
|
|
id: (self.new_id)(x.id),
|
|
node: n,
|
|
span: (self.new_span)(s),
|
|
}
|
|
}
|
|
fn fold_mod(x: _mod) -> _mod {
|
|
return (self.fold_mod)(x, self as ast_fold);
|
|
}
|
|
fn fold_foreign_mod(x: foreign_mod) ->
|
|
foreign_mod {
|
|
return (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);
|
|
spanned { node: n, span: (self.new_span)(s) }
|
|
}
|
|
fn fold_ident(&&x: ident) -> ident {
|
|
return (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);
|
|
@spanned { node: n, span: (self.new_span)(s) }
|
|
}
|
|
fn map_exprs(f: fn@(&&v: @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)
|
|
}
|
|
}
|
|
|
|
pub impl ast_fold {
|
|
fn fold_attributes(attrs: ~[attribute]) -> ~[attribute] {
|
|
attrs.map(|x| fold_attribute_(*x, self))
|
|
}
|
|
}
|
|
|
|
pub fn make_fold(afp: ast_fold_fns) -> 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:
|
|
//
|