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use std::cmp;
use std::string::String;
use std::usize;
use clean::{self, Item};
use plugins;
use fold::{self, DocFolder};
pub fn unindent_comments(krate: clean::Crate) -> plugins::PluginResult {
CommentCleaner.fold_crate(krate)
}
struct CommentCleaner;
impl fold::DocFolder for CommentCleaner {
fn fold_item(&mut self, mut i: Item) -> Option<Item> {
i.attrs.unindent_doc_comments();
self.fold_item_recur(i)
}
}
impl clean::Attributes {
pub fn unindent_doc_comments(&mut self) {
for doc_string in &mut self.doc_strings {
*doc_string = unindent(doc_string);
}
}
}
fn unindent(s: &str) -> String {
let lines = s.lines().collect::<Vec<&str> >();
let mut saw_first_line = false;
let mut saw_second_line = false;
let min_indent = lines.iter().fold(usize::MAX, |min_indent, line| {
let ignore_previous_indents =
saw_first_line &&
!saw_second_line &&
!line.chars().all(|c| c.is_whitespace());
let min_indent = if ignore_previous_indents {
usize::MAX
} else {
min_indent
};
if saw_first_line {
saw_second_line = true;
}
if line.chars().all(|c| c.is_whitespace()) {
min_indent
} else {
saw_first_line = true;
let mut whitespace = 0;
line.chars().all(|char| {
if char == ' ' || char == '\t' {
whitespace += 1;
true
} else {
false
}
});
cmp::min(min_indent, whitespace)
}
});
if !lines.is_empty() {
let mut unindented = vec![ lines[0].trim().to_string() ];
unindented.extend_from_slice(&lines[1..].iter().map(|&line| {
if line.chars().all(|c| c.is_whitespace()) {
line.to_string()
} else {
assert!(line.len() >= min_indent);
line[min_indent..].to_string()
}
}).collect::<Vec<_>>());
unindented.join("\n")
} else {
s.to_string()
}
}
#[cfg(test)]
mod unindent_tests {
use super::unindent;
#[test]
fn should_unindent() {
let s = " line1\n line2".to_string();
let r = unindent(&s);
assert_eq!(r, "line1\nline2");
}
#[test]
fn should_unindent_multiple_paragraphs() {
let s = " line1\n\n line2".to_string();
let r = unindent(&s);
assert_eq!(r, "line1\n\nline2");
}
#[test]
fn should_leave_multiple_indent_levels() {
let s = " line1\n\n line2".to_string();
let r = unindent(&s);
assert_eq!(r, "line1\n\n line2");
}
#[test]
fn should_ignore_first_line_indent() {
let s = "line1\n line2".to_string();
let r = unindent(&s);
assert_eq!(r, "line1\nline2");
}
#[test]
fn should_not_ignore_first_line_indent_in_a_single_line_para() {
let s = "line1\n\n line2".to_string();
let r = unindent(&s);
assert_eq!(r, "line1\n\n line2");
}
#[test]
fn should_unindent_tabs() {
let s = "\tline1\n\tline2".to_string();
let r = unindent(&s);
assert_eq!(r, "line1\nline2");
}
#[test]
fn should_trim_mixed_indentation() {
let s = "\t line1\n\t line2".to_string();
let r = unindent(&s);
assert_eq!(r, "line1\nline2");
let s = " \tline1\n \tline2".to_string();
let r = unindent(&s);
assert_eq!(r, "line1\nline2");
}
}