rust/src/libsyntax/parse/classify.rs
2012-11-29 12:09:10 -08:00

36 lines
938 B
Rust

/*
Predicates on exprs and stmts that the pretty-printer and parser use
*/
use ast_util::operator_prec;
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(_, _, true) => false,
_ => true
}
}
fn expr_is_simple_block(e: @ast::expr) -> bool {
match e.node {
ast::expr_block({node: {rules: ast::default_blk, _}, _}) => true,
_ => false
}
}
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 }
}
}