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Handle pretty-printing else-if properly.

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This commit is contained in:
Graydon Hoare 2011-05-31 12:57:56 -07:00
parent cc96eeafca
commit 2de1a4bb1b
1 changed files with 26 additions and 12 deletions
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38
src/comp/pretty/pprust.rs
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@ -587,28 +587,42 @@ fn print_expr(&ps s, &@ast::expr expr) {
print_type(s, *ty);
}
case (ast::expr_if(?test,?block,?elseopt,_)) {
head(s, "if");
popen(s);
print_expr(s, test);
pclose(s);
space(s.s);
print_block(s, block);
alt (elseopt) {
case (option::some[@ast::expr](?_else)) {
// NB: we can't use 'head' here since
// it builds a block that starts in the
// wrong column.
cbox(s.s, indent_unit-1u);
ibox(s.s, 0u);
word(s.s, " else ");
alt (_else.node) {
case (ast::expr_block(?b, _)) {
print_block(s, block);
fn do_else(&ps s, option::t[@ast::expr] els) {
alt (els) {
case (option::some[@ast::expr](?_else)) {
alt (_else.node) {
// "another else-if"
case (ast::expr_if(?i,?t,?e,_)) {
cbox(s.s, indent_unit-1u);
ibox(s.s, 0u);
word(s.s, " else if ");
popen(s);
print_expr(s, i);
pclose(s);
space(s.s);
print_block(s, t);
do_else(s, e);
}
// "final else"
case (ast::expr_block(?b, _)) {
cbox(s.s, indent_unit-1u);
ibox(s.s, 0u);
word(s.s, " else ");
print_block(s, b);
}
}
}
case (_) { /* fall through */ }
}
case (_) { /* fall through */ }
}
do_else(s, elseopt);
}
case (ast::expr_while(?test,?block,_)) {
head(s, "while");