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rustc: Add bind expressions to the AST

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This commit is contained in:
Patrick Walton 2010-12-20 18:58:18 -08:00
parent ed1dddc33f
commit 5cbf8889d0
2 changed files with 26 additions and 0 deletions
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1
src/comp/front/ast.rs
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@ -139,6 +139,7 @@ tag expr_ {
expr_tup(vec[elt], ann);
expr_rec(vec[field], ann);
expr_call(@expr, vec[@expr], ann);
expr_bind(@expr, vec[option.t[@expr]], ann);
expr_binary(binop, @expr, @expr, ann);
expr_unary(unop, @expr, ann);
expr_lit(@lit, ann);

25
src/comp/middle/fold.rs
View File

@ -74,6 +74,10 @@ type ast_fold[ENV] =
@expr f, vec[@expr] args,
ann a) -> @expr) fold_expr_call,
(fn(&ENV e, &span sp,
@expr f, vec[option.t[@expr]] args,
ann a) -> @expr) fold_expr_bind,
(fn(&ENV e, &span sp,
ast.binop,
@expr lhs, @expr rhs,
@ -417,6 +421,20 @@ fn fold_expr[ENV](&ENV env, ast_fold[ENV] fld, &@expr e) -> @expr {
ret fld.fold_expr_call(env_, e.span, ff, aargs, t);
}
case (ast.expr_bind(?f, ?args_opt, ?t)) {
auto ff = fold_expr(env_, fld, f);
let vec[option.t[@ast.expr]] aargs_opt = vec();
for (option.t[@ast.expr] t_opt in args_opt) {
alt (t_opt) {
case (some[@ast.expr](?e)) {
aargs_opt += vec(some(fold_expr(env_, fld, e)));
}
case (none[@ast.expr]) { /* empty */ }
}
}
ret fld.fold_expr_bind(env_, e.span, ff, aargs_opt, t);
}
case (ast.expr_binary(?op, ?a, ?b, ?t)) {
auto aa = fold_expr(env_, fld, a);
auto bb = fold_expr(env_, fld, b);
@ -807,6 +825,12 @@ fn identity_fold_expr_call[ENV](&ENV env, &span sp, @expr f,
ret @respan(sp, ast.expr_call(f, args, a));
}
fn identity_fold_expr_bind[ENV](&ENV env, &span sp, @expr f,
vec[option.t[@expr]] args_opt, ann a)
-> @expr {
ret @respan(sp, ast.expr_bind(f, args_opt, a));
}
fn identity_fold_expr_binary[ENV](&ENV env, &span sp, ast.binop b,
@expr lhs, @expr rhs,
ann a) -> @expr {
@ -1075,6 +1099,7 @@ fn new_identity_fold[ENV]() -> ast_fold[ENV] {
fold_expr_tup = bind identity_fold_expr_tup[ENV](_,_,_,_),
fold_expr_rec = bind identity_fold_expr_rec[ENV](_,_,_,_),
fold_expr_call = bind identity_fold_expr_call[ENV](_,_,_,_,_),
fold_expr_bind = bind identity_fold_expr_bind[ENV](_,_,_,_,_),
fold_expr_binary = bind identity_fold_expr_binary[ENV](_,_,_,_,_,_),
fold_expr_unary = bind identity_fold_expr_unary[ENV](_,_,_,_,_),
fold_expr_lit = bind identity_fold_expr_lit[ENV](_,_,_,_),