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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
/*
Predicates on exprs and stmts that the pretty-printer and parser use
*/
use ast;
use codemap;
use ast_util::operator_prec;
pub fn expr_requires_semi_to_be_stmt(e: @ast::expr) -> bool {
match e.node {
ast::expr_if(*)
| ast::expr_match(*)
| ast::expr_block(_)
| ast::expr_while(*)
| ast::expr_loop(*)
| ast::expr_call(_, _, ast::DoSugar)
| ast::expr_call(_, _, ast::ForSugar)
| ast::expr_method_call(_, _, _, _, ast::DoSugar)
| ast::expr_method_call(_, _, _, _, ast::ForSugar) => false,
_ => true
}
}
pub fn expr_is_simple_block(e: @ast::expr) -> bool {
match e.node {
ast::expr_block(
codemap::spanned {
node: ast::blk_ { rules: ast::default_blk, _ }, _ }
) => true,
_ => false
}
}
pub fn stmt_ends_with_semi(stmt: ast::stmt) -> bool {
return match stmt.node {
ast::stmt_decl(d, _) => {
match d.node {
ast::decl_local(_) => true,
ast::decl_item(_) => false
}
}
ast::stmt_expr(e, _) => { expr_requires_semi_to_be_stmt(e) }
ast::stmt_semi(*) => { false }
ast::stmt_mac(*) => { false }
}
}
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