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// Copyright 2015 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.
use Indent;
use rewrite::{Rewrite, RewriteContext};
use utils::{wrap_str, format_mutability, span_after};
use lists::{format_item_list, itemize_list};
use expr::{rewrite_unary_prefix, rewrite_pair, rewrite_tuple};
use types::rewrite_path;
use syntax::ast::{BindingMode, Pat, Pat_};
// FIXME(#18): implement pattern formatting.
impl Rewrite for Pat {
fn rewrite(&self, context: &RewriteContext, width: usize, offset: Indent) -> Option<String> {
match self.node {
Pat_::PatBox(ref pat) => rewrite_unary_prefix(context, "box ", &**pat, width, offset),
Pat_::PatIdent(binding_mode, ident, None) => {
let (prefix, mutability) = match binding_mode {
BindingMode::BindByRef(mutability) => ("ref ", mutability),
BindingMode::BindByValue(mutability) => ("", mutability),
};
let mut_infix = format_mutability(mutability);
let result = format!("{}{}{}", prefix, mut_infix, ident.node);
wrap_str(result, context.config.max_width, width, offset)
}
Pat_::PatWild => {
if 1 <= width {
Some("_".to_owned())
} else {
None
}
}
Pat_::PatQPath(ref q_self, ref path) => {
rewrite_path(context, true, Some(q_self), path, width, offset)
}
Pat_::PatRange(ref lhs, ref rhs) => {
rewrite_pair(&**lhs, &**rhs, "", "...", "", context, width, offset)
}
Pat_::PatRegion(ref pat, mutability) => {
let prefix = format!("&{}", format_mutability(mutability));
rewrite_unary_prefix(context, &prefix, &**pat, width, offset)
}
Pat_::PatTup(ref items) => rewrite_tuple(context, items, self.span, width, offset),
Pat_::PatEnum(ref path, Some(ref pat_vec)) => {
let path_str = try_opt!(::types::rewrite_path(context,
true,
None,
path,
width,
offset));
if pat_vec.is_empty() {
Some(path_str)
} else {
// 1 = (
let width = try_opt!(width.checked_sub(path_str.len() + 1));
let offset = offset + path_str.len() + 1;
let items = itemize_list(context.codemap,
pat_vec.iter(),
")",
|item| item.span.lo,
|item| item.span.hi,
|item| item.rewrite(context, width, offset),
span_after(self.span, "(", context.codemap),
self.span.hi);
Some(format!("{}({})",
path_str,
try_opt!(format_item_list(items, width, offset, context.config))))
}
}
Pat_::PatLit(ref expr) => expr.rewrite(context, width, offset),
// FIXME(#8): format remaining pattern variants.
Pat_::PatIdent(_, _, Some(..)) |
Pat_::PatEnum(_, None) |
Pat_::PatStruct(..) |
Pat_::PatVec(..) |
Pat_::PatMac(..) => {
wrap_str(context.snippet(self.span),
context.config.max_width,
width,
offset)
}
}
}
}
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