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needless_continue: Remove indentation of suggestion code.

Browse Source 
As per a suggestion by Oliver on the PR thread, maintaining indentation
in the suggested code is futile because of the changes in the compiler
and the messiness of real-world code. rustfmt will do the indentation if
required, so we don't need to do it.
This commit is contained in:
Yati Sagade 2017-04-13 21:48:52 +02:00
parent 7ee0d4f9c2
commit cac15d24f9
4 changed files with 26 additions and 292 deletions
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11
clippy_lints/src/needless_continue.rs
View File

@ -32,8 +32,7 @@ use syntax::ast;
use syntax::codemap::{original_sp,DUMMY_SP};
use std::borrow::Cow;
use utils::{in_macro, span_help_and_lint, snippet_block, snippet, trim_multiline,
left_pad_lines_with_spaces, align_snippets};
use utils::{in_macro, span_help_and_lint, snippet_block, snippet, trim_multiline};
/// **What it does:** The lint checks for `if`-statements appearing in loops
/// that contain a `continue` statement in either their main blocks or their
@ -312,7 +311,6 @@ fn suggestion_snippet_for_continue_inside_else<'a>(ctx: &EarlyContext,
let block_code = &snippet(ctx, data.if_block.span, "..").into_owned();
let block_code = erode_block(block_code);
let block_code = trim_multiline(Cow::from(block_code), false);
let block_code = left_pad_lines_with_spaces(&block_code, 4_usize);
if_code.push_str(&block_code);
@ -329,9 +327,10 @@ fn suggestion_snippet_for_continue_inside_else<'a>(ctx: &EarlyContext,
.collect::<Vec<_>>().join("\n");
let mut ret = String::from(header);
ret.push_str(&align_snippets(&[&if_code,
"\n// Merged code follows...",
&to_annex]));
ret.push_str(&if_code);
ret.push_str("\n// Merged code follows...");
ret.push_str(&to_annex);
ret.push_str("\n}\n");
ret
}

189
clippy_lints/src/utils/mod.rs
View File

@ -22,7 +22,6 @@ use syntax::codemap::{ExpnFormat, ExpnInfo, MultiSpan, Span, DUMMY_SP};
use syntax::errors::DiagnosticBuilder;
use syntax::ptr::P;
use syntax::symbol::keywords;
use std::iter;
pub mod comparisons;
pub mod conf;
@ -980,191 +979,3 @@ pub fn type_size<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, ty: ty::Ty<'tcx>) -> Opti
.enter(|infcx| ty.layout(&infcx).ok().map(|lay| lay.size(&TargetDataLayout::parse(cx.sess())).bytes()))
}
/// Add `n` spaces to the left of `s`.
pub fn left_pad_with_spaces(s: &str, n: usize) -> String {
let mut new_s = iter::repeat(' ').take(n).collect::<String>();
new_s.push_str(s);
new_s
}
/// Add `n` spaces to the left of each line in `s` and return the result
/// in a new String.
/// e.g., when n = 2, the string
///
/// " fn foo() {
/// bar()
/// }"
///
/// becomes
///
/// " fn foo() {
/// bar()
/// }"
///
/// # Example
///
/// ```
/// use clippy_lints::utils::left_pad_with_spaces;
///
/// let input = "\
/// fn main() {
/// println!("hello world!");
/// }";
///
/// let expected =
/// " fn main() {
/// println!("hello world!");
/// }";
///
/// assert_eq!(expected, input);
/// ```
pub fn left_pad_lines_with_spaces(s: &str, n: usize) -> String {
s.lines()
.map(|line| left_pad_with_spaces(line, n))
.collect::<Vec<_>>()
.join("\n")
}
/// Remove upto `n` whitespace characters from the beginning of `s`.
///
/// # Examples
///
/// ```
/// let s = " foobar ";
/// assert_eq!("foobar ", remove_whitespace_from_left(s, 100));
/// assert_eq!(" foobar ", remove_whitespace_from_left(s, 2));
/// assert_eq("", remove_whitespace_from_left(" ", 50));
/// ```
pub fn remove_whitespace_from_left(s: &str, n: usize) -> String {
s.chars()
.enumerate()
.skip_while(|&(i, c)| i < n && c.is_whitespace())
.map(|(_, c)| c)
.collect::<String>()
}
/// Aligns two snippets such that the indentation level of the last non-empty,
/// non-space line of the first snippet matches the first non-empty, non-space
/// line of the second.
pub fn align_two_snippets(s: &str, t: &str) -> String {
// indent level of the last nonempty, non-whitespace line of s.
let target_ilevel = s.lines()
.rev()
.skip_while(|line| line.is_empty() || is_all_whitespace(line))
.next()
.map_or(0_usize, indent_level);
// We want to align the first nonempty, non-all-whitespace line of t to
// have the same indent level as target_ilevel
let level = t.lines()
.skip_while(|line| line.is_empty() || is_all_whitespace(line))
.next()
.map_or(0_usize, indent_level);
// When add_spaces=true, we add spaces, otherwise eat.
let add_spaces = target_ilevel > level;
let delta = if add_spaces {
target_ilevel - level
} else {
level - target_ilevel
};
let new_t = t.lines()
.map(|line| {
if is_null(line) {
// leave empty lines alone
String::from(line)
} else if add_spaces {
left_pad_with_spaces(line, delta)
} else {
remove_whitespace_from_left(line, delta)
}
})
.collect::<Vec<_>>().join("\n");
format!("{}\n{}", s, new_t)
}
/// Aligns strings in `xs` pairwise from the start, such that for any pair of
/// strings, the first string's last line is aligned with the first line of
/// the second string. See `align_two_snippets`. Use this to merge code regions
/// into a reasonably aligned chunk of code.
///
/// For example, consider
///
/// ```
/// let s1 = "\
/// if (condition()) {
/// do_something()";
///
/// let s2 = "\
/// code_from_somewhere_else();"
///
/// let s3 = "\
/// another_piece_of_code();
/// indented_here();";
/// ```
///
///
///
/// Now calling `align_snippets(&[s1, s2, s3])` will yield the following:
///
/// ```
/// if (condition()) {
/// do_something();
/// code_from_somewhere_else();
/// another_piece_of_code();
/// indented_here();
/// ```
pub fn align_snippets(xs: &[&str]) -> String {
if xs.is_empty() {
String::from("")
} else {
let mut ret = xs[0].to_string();
for x in xs.iter().skip(1_usize) {
ret = align_two_snippets(&ret, x);
}
ret
}
}
/// # Examples
/// ```
/// use clippy_lints::utils::is_all_whitespace;
///
/// assert_eq!(true, " \n\t ");
/// assert_eq!(false, "");
/// assert_eq!(false, "hello world!\n");
/// ```
pub fn is_all_whitespace(s: &str) -> bool {
s.chars().all(|c| c.is_whitespace())
}
/// Returns true if a string is empty or just spaces.
pub fn is_null(s: &str) -> bool {
s.is_empty() || is_all_whitespace(s)
}
/// Returns the indentation level of a string. It just returns the count of
/// whitespace characters in the string before a non-whitespace character
/// is encountered.
///
/// # Examples
///
/// ```
/// use clippy_lints::utils::indent_level;
///
/// let s = " fn foo() { ";
/// assert_eq!(4, indent_level(s));
///
/// let s = "fn foo() { ";
/// assert_eq!(0, indent_level(s));
/// ```
pub fn indent_level(s: &str) -> usize {
s.chars()
.enumerate()
.find(|&(_, c)| !c.is_whitespace())
.map_or(0_usize, |(i, _)| i)
}

74
tests/test_align_snippets.rs
View File

@ -1,74 +0,0 @@
extern crate clippy_lints;
use clippy_lints::utils::align_snippets;
#[test]
fn test_align_snippets_single_line() {
assert_eq!("", align_snippets(&[""]));
assert_eq!("...", align_snippets(&["..."]));
}
#[test]
#[cfg_attr(rustfmt, rustfmt_skip)]
fn test_align_snippets_multiline() {
let expected = "\
if condition() {
do_something();
do_another_thing();
yet_another_thing();
{
and_then_an_indented_block();
}
and_then_something_the_user_indented();"; // expected
let input = &[
"\
if condition() {
do_something();",
" do_another_thing();",
" yet_another_thing();
{
and_then_an_indented_block();
}
and_then_something_the_user_indented();",
]; // input
let got = align_snippets(input);
assert_eq!(expected, got);
}
#[test]
#[cfg_attr(rustfmt, rustfmt_skip)]
fn test_align_snippets_multiline_with_empty_lines() {
let expected = "\
if condition() {
do_something();
do_another_thing();
yet_another_thing();
{
and_then_an_indented_block();
}
and_then_something_the_user_indented();"; // expected
let input = &[
"\
if condition() {
do_something();",
" do_another_thing();",
" yet_another_thing();
{
and_then_an_indented_block();
}
and_then_something_the_user_indented();",
]; // input
let got = align_snippets(input);
println!("Input: {}\nExpected: {}\nGot: {}", input.join("\n"), &expected, &got);
assert_eq!(expected, got);
}

44
tests/ui/needless_continue.stderr
View File

@ -15,29 +15,27 @@ note: lint level defined here
| ^^^^^^^^^^^^^^^^^
= help: Consider dropping the else clause and merging the code that follows (in the loop) with the if block, like so:
if i % 2 == 0 && i % 3 == 0 {
println!("{}", i);
println!("{}", i+1);
if i % 5 == 0 {
println!("{}", i+2);
}
let i = 0;
println!("bar {} ", i);
// Merged code follows...
println!("bleh");
{
println!("blah");
}
if !(!(i == 2) || !(i == 5)) {
println!("lama");
}
if (zero!(i % 2) || nonzero!(i % 5)) && i % 3 != 0 {
continue;
} else {
println!("Blabber");
println!("Jabber");
}
println!("bleh");
println!("{}", i);
println!("{}", i+1);
if i % 5 == 0 {
println!("{}", i+2);
}
let i = 0;
println!("bar {} ", i);
// Merged code follows...println!("bleh");
{
println!("blah");
}
if !(!(i == 2) || !(i == 5)) {
println!("lama");
}
if (zero!(i % 2) || nonzero!(i % 5)) && i % 3 != 0 {
continue;
} else {
println!("Blabber");
println!("Jabber");
}
println!("bleh");
}