62f98c8ff8
Maintain explicit "paren" nodes in the AST so we can pretty-print without having to guess where parens should go. We may revisit this in the future. r=graydon
38 lines
928 B
Rust
38 lines
928 B
Rust
/*
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Predicates on exprs and stmts that the pretty-printer and parser use
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*/
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use ast_util::operator_prec;
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fn expr_requires_semi_to_be_stmt(e: @ast::expr) -> bool {
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match e.node {
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ast::expr_if(*) | ast::expr_match(*) | ast::expr_block(_)
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| ast::expr_while(*) | ast::expr_loop(*)
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| ast::expr_call(_, _, true) => false,
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_ => true
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}
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}
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fn expr_is_simple_block(e: @ast::expr) -> bool {
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match e.node {
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ast::expr_block({node: {rules: ast::default_blk, _}, _}) => true,
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_ => false
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}
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}
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fn stmt_ends_with_semi(stmt: ast::stmt) -> bool {
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match stmt.node {
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ast::stmt_decl(d, _) => {
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return match d.node {
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ast::decl_local(_) => true,
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ast::decl_item(_) => false
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}
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}
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ast::stmt_expr(e, _) => {
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return expr_requires_semi_to_be_stmt(e);
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}
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ast::stmt_semi(*) => {
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return false;
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}
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}
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}
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