680 lines
24 KiB
Rust
680 lines
24 KiB
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Format string literals.
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use regex::Regex;
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use unicode_segmentation::UnicodeSegmentation;
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use config::Config;
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use shape::Shape;
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use utils::wrap_str;
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const MIN_STRING: usize = 10;
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/// Describes the layout of a piece of text.
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pub struct StringFormat<'a> {
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/// The opening sequence of characters for the piece of text
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pub opener: &'a str,
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/// The closing sequence of characters for the piece of text
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pub closer: &'a str,
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/// The opening sequence of characters for a line
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pub line_start: &'a str,
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/// The closing sequence of characters for a line
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pub line_end: &'a str,
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/// The allocated box to fit the text into
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pub shape: Shape,
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/// Trim trailing whitespaces
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pub trim_end: bool,
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pub config: &'a Config,
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}
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impl<'a> StringFormat<'a> {
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pub fn new(shape: Shape, config: &'a Config) -> StringFormat<'a> {
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StringFormat {
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opener: "\"",
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closer: "\"",
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line_start: " ",
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line_end: "\\",
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shape,
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trim_end: false,
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config,
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}
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}
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/// Returns the maximum number of graphemes that is possible on a line while taking the
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/// indentation into account.
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///
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/// If we cannot put at least a single character per line, the rewrite won't succeed.
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fn max_chars_with_indent(&self) -> Option<usize> {
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Some(
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self.shape
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.width
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.checked_sub(self.opener.len() + self.line_end.len() + 1)?
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+ 1,
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)
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}
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/// Like max_chars_with_indent but the indentation is not substracted.
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/// This allows to fit more graphemes from the string on a line when
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/// SnippetState::EndWithLineFeed.
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fn max_chars_without_indent(&self) -> Option<usize> {
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Some(self.config.max_width().checked_sub(self.line_end.len())?)
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}
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}
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pub fn rewrite_string<'a>(
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orig: &str,
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fmt: &StringFormat<'a>,
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newline_max_chars: usize,
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) -> Option<String> {
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let max_chars_with_indent = fmt.max_chars_with_indent()?;
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let max_chars_without_indent = fmt.max_chars_without_indent()?;
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let indent_with_newline = fmt.shape.indent.to_string_with_newline(fmt.config);
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let indent_without_newline = fmt.shape.indent.to_string(fmt.config);
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// Strip line breaks.
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// With this regex applied, all remaining whitespaces are significant
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let strip_line_breaks_re = Regex::new(r"([^\\](\\\\)*)\\[\n\r][[:space:]]*").unwrap();
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let stripped_str = strip_line_breaks_re.replace_all(orig, "$1");
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let graphemes = UnicodeSegmentation::graphemes(&*stripped_str, false).collect::<Vec<&str>>();
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// `cur_start` is the position in `orig` of the start of the current line.
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let mut cur_start = 0;
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let mut result = String::with_capacity(
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stripped_str
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.len()
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.checked_next_power_of_two()
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.unwrap_or(usize::max_value()),
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);
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result.push_str(fmt.opener);
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// Snip a line at a time from `stripped_str` until it is used up. Push the snippet
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// onto result.
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let mut cur_max_chars = max_chars_with_indent;
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let is_bareline_ok = fmt.line_start.is_empty() || is_whitespace(fmt.line_start);
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loop {
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// All the input starting at cur_start fits on the current line
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if graphemes.len() - cur_start <= cur_max_chars {
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for (i, grapheme) in graphemes[cur_start..].iter().enumerate() {
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if is_line_feed(grapheme) {
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// take care of blank lines
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result = trim_right_but_line_feed(fmt.trim_end, result);
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result.push_str("\n");
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if !is_bareline_ok && cur_start + i + 1 < graphemes.len() {
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result.push_str(&indent_without_newline);
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result.push_str(fmt.line_start);
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}
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} else {
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result.push_str(grapheme);
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}
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}
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result = trim_right_but_line_feed(fmt.trim_end, result);
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break;
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}
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// The input starting at cur_start needs to be broken
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match break_string(
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cur_max_chars,
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fmt.trim_end,
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fmt.line_end,
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&graphemes[cur_start..],
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) {
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SnippetState::LineEnd(line, len) => {
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result.push_str(&line);
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result.push_str(fmt.line_end);
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result.push_str(&indent_with_newline);
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result.push_str(fmt.line_start);
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cur_max_chars = newline_max_chars;
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cur_start += len;
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}
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SnippetState::EndWithLineFeed(line, len) => {
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if line == "\n" && fmt.trim_end {
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result = result.trim_right().to_string();
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}
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result.push_str(&line);
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if is_bareline_ok {
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// the next line can benefit from the full width
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cur_max_chars = max_chars_without_indent;
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} else {
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result.push_str(&indent_without_newline);
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result.push_str(fmt.line_start);
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cur_max_chars = max_chars_with_indent;
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}
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cur_start += len;
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}
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SnippetState::EndOfInput(line) => {
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result.push_str(&line);
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break;
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}
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}
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}
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result.push_str(fmt.closer);
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wrap_str(result, fmt.config.max_width(), fmt.shape)
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}
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/// Returns the index to the end of the url if the given string includes an
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/// URL or alike. Otherwise, returns None;
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fn detect_url(s: &[&str], index: usize) -> Option<usize> {
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let start = match s[..=index].iter().rposition(|g| is_whitespace(g)) {
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Some(pos) => pos + 1,
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None => 0,
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};
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if s.len() < start + 8 {
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return None;
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}
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let prefix = s[start..start + 8].concat();
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if prefix.starts_with("https://")
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|| prefix.starts_with("http://")
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|| prefix.starts_with("ftp://")
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|| prefix.starts_with("file://")
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{
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match s[index..].iter().position(|g| is_whitespace(g)) {
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Some(pos) => Some(index + pos - 1),
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None => Some(s.len() - 1),
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}
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} else {
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None
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}
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}
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/// Trims whitespaces to the right except for the line feed character.
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fn trim_right_but_line_feed(trim_end: bool, result: String) -> String {
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let whitespace_except_line_feed = |c: char| c.is_whitespace() && c != '\n';
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if trim_end && result.ends_with(whitespace_except_line_feed) {
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result
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.trim_right_matches(whitespace_except_line_feed)
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.to_string()
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} else {
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result
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}
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}
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/// Result of breaking a string so it fits in a line and the state it ended in.
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/// The state informs about what to do with the snippet and how to continue the breaking process.
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#[derive(Debug, PartialEq)]
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enum SnippetState {
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/// The input could not be broken and so rewriting the string is finished.
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EndOfInput(String),
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/// The input could be broken and the returned snippet should be ended with a
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/// `[StringFormat::line_end]`. The next snippet needs to be indented.
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///
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/// The returned string is the line to print out and the number is the length that got read in
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/// the text being rewritten. That length may be greater than the returned string if trailing
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/// whitespaces got trimmed.
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LineEnd(String, usize),
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/// The input could be broken but a newline is present that cannot be trimmed. The next snippet
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/// to be rewritten *could* use more width than what is specified by the given shape. For
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/// example with a multiline string, the next snippet does not need to be indented, allowing
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/// more characters to be fit within a line.
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///
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/// The returned string is the line to print out and the number is the length that got read in
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/// the text being rewritten.
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EndWithLineFeed(String, usize),
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}
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fn not_whitespace_except_line_feed(g: &str) -> bool {
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is_line_feed(g) || !is_whitespace(g)
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}
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/// Break the input string at a boundary character around the offset `max_chars`. A boundary
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/// character is either a punctuation or a whitespace.
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fn break_string(max_chars: usize, trim_end: bool, line_end: &str, input: &[&str]) -> SnippetState {
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let break_at = |index /* grapheme at index is included */| {
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// Take in any whitespaces to the left/right of `input[index]` while
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// preserving line feeds
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let index_minus_ws = input[0..=index]
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.iter()
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.rposition(|grapheme| not_whitespace_except_line_feed(grapheme))
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.unwrap_or(index);
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// Take into account newlines occuring in input[0..=index], i.e., the possible next new
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// line. If there is one, then text after it could be rewritten in a way that the available
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// space is fully used.
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for (i, grapheme) in input[0..=index].iter().enumerate() {
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if is_line_feed(grapheme) {
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if i <= index_minus_ws {
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let mut line = &input[0..i].concat()[..];
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if trim_end {
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line = line.trim_right();
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}
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return SnippetState::EndWithLineFeed(format!("{}\n", line), i + 1);
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}
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break;
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}
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}
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let mut index_plus_ws = index;
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for (i, grapheme) in input[index + 1..].iter().enumerate() {
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if !trim_end && is_line_feed(grapheme) {
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return SnippetState::EndWithLineFeed(
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input[0..=index + 1 + i].concat(),
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index + 2 + i,
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);
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} else if not_whitespace_except_line_feed(grapheme) {
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index_plus_ws = index + i;
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break;
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}
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}
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if trim_end {
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SnippetState::LineEnd(input[0..=index_minus_ws].concat(), index_plus_ws + 1)
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} else {
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SnippetState::LineEnd(input[0..=index_plus_ws].concat(), index_plus_ws + 1)
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}
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};
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// Find the position in input for breaking the string
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if line_end.is_empty()
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&& trim_end
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&& !is_whitespace(input[max_chars - 1])
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&& is_whitespace(input[max_chars])
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{
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// At a breaking point already
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// The line won't invalidate the rewriting because:
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// - no extra space needed for the line_end character
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// - extra whitespaces to the right can be trimmed
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return break_at(max_chars - 1);
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}
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if let Some(url_index_end) = detect_url(input, max_chars) {
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let index_plus_ws = url_index_end
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+ input[url_index_end..]
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.iter()
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.skip(1)
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.position(|grapheme| not_whitespace_except_line_feed(grapheme))
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.unwrap_or(0);
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return if trim_end {
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SnippetState::LineEnd(input[..=url_index_end].concat(), index_plus_ws + 1)
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} else {
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return SnippetState::LineEnd(input[..=index_plus_ws].concat(), index_plus_ws + 1);
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};
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}
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match input[0..max_chars]
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.iter()
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.rposition(|grapheme| is_whitespace(grapheme))
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{
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// Found a whitespace and what is on its left side is big enough.
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Some(index) if index >= MIN_STRING => break_at(index),
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// No whitespace found, try looking for a punctuation instead
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_ => match input[0..max_chars]
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.iter()
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.rposition(|grapheme| is_punctuation(grapheme))
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{
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// Found a punctuation and what is on its left side is big enough.
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Some(index) if index >= MIN_STRING => break_at(index),
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// Either no boundary character was found to the left of `input[max_chars]`, or the line
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// got too small. We try searching for a boundary character to the right.
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_ => match input[max_chars..]
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.iter()
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.position(|grapheme| is_whitespace(grapheme) || is_punctuation(grapheme))
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{
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// A boundary was found after the line limit
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Some(index) => break_at(max_chars + index),
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// No boundary to the right, the input cannot be broken
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None => SnippetState::EndOfInput(input.concat()),
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},
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},
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}
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}
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fn is_line_feed(grapheme: &str) -> bool {
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grapheme.as_bytes()[0] == b'\n'
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}
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fn is_whitespace(grapheme: &str) -> bool {
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grapheme.chars().all(|c| c.is_whitespace())
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}
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fn is_punctuation(grapheme: &str) -> bool {
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match grapheme.as_bytes()[0] {
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b':' | b',' | b';' | b'.' => true,
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_ => false,
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}
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}
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#[cfg(test)]
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mod test {
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use super::{break_string, detect_url, rewrite_string, SnippetState, StringFormat};
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use config::Config;
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use shape::{Indent, Shape};
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use unicode_segmentation::UnicodeSegmentation;
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#[test]
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fn issue343() {
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let config = Default::default();
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let fmt = StringFormat::new(Shape::legacy(2, Indent::empty()), &config);
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rewrite_string("eq_", &fmt, 2);
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}
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#[test]
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fn should_break_on_whitespace() {
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let string = "Placerat felis. Mauris porta ante sagittis purus.";
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let graphemes = UnicodeSegmentation::graphemes(&*string, false).collect::<Vec<&str>>();
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assert_eq!(
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break_string(20, false, "", &graphemes[..]),
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SnippetState::LineEnd("Placerat felis. ".to_string(), 16)
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);
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assert_eq!(
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break_string(20, true, "", &graphemes[..]),
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SnippetState::LineEnd("Placerat felis.".to_string(), 16)
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);
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}
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#[test]
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fn should_break_on_punctuation() {
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let string = "Placerat_felis._Mauris_porta_ante_sagittis_purus.";
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let graphemes = UnicodeSegmentation::graphemes(&*string, false).collect::<Vec<&str>>();
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assert_eq!(
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break_string(20, false, "", &graphemes[..]),
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SnippetState::LineEnd("Placerat_felis.".to_string(), 15)
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);
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}
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#[test]
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fn should_break_forward() {
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let string = "Venenatis_tellus_vel_tellus. Aliquam aliquam dolor at justo.";
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let graphemes = UnicodeSegmentation::graphemes(&*string, false).collect::<Vec<&str>>();
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assert_eq!(
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break_string(20, false, "", &graphemes[..]),
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SnippetState::LineEnd("Venenatis_tellus_vel_tellus. ".to_string(), 29)
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);
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assert_eq!(
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break_string(20, true, "", &graphemes[..]),
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SnippetState::LineEnd("Venenatis_tellus_vel_tellus.".to_string(), 29)
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);
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}
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#[test]
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fn nothing_to_break() {
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let string = "Venenatis_tellus_vel_tellus";
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let graphemes = UnicodeSegmentation::graphemes(&*string, false).collect::<Vec<&str>>();
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assert_eq!(
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break_string(20, false, "", &graphemes[..]),
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SnippetState::EndOfInput("Venenatis_tellus_vel_tellus".to_string())
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);
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}
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#[test]
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fn significant_whitespaces() {
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let string = "Neque in sem. \n Pellentesque tellus augue.";
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let graphemes = UnicodeSegmentation::graphemes(&*string, false).collect::<Vec<&str>>();
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assert_eq!(
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break_string(15, false, "", &graphemes[..]),
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SnippetState::EndWithLineFeed("Neque in sem. \n".to_string(), 20)
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);
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assert_eq!(
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break_string(25, false, "", &graphemes[..]),
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SnippetState::EndWithLineFeed("Neque in sem. \n".to_string(), 20)
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);
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assert_eq!(
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break_string(15, true, "", &graphemes[..]),
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SnippetState::LineEnd("Neque in sem.".to_string(), 19)
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);
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assert_eq!(
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break_string(25, true, "", &graphemes[..]),
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SnippetState::EndWithLineFeed("Neque in sem.\n".to_string(), 20)
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);
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}
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#[test]
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fn big_whitespace() {
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let string = "Neque in sem. Pellentesque tellus augue.";
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let graphemes = UnicodeSegmentation::graphemes(&*string, false).collect::<Vec<&str>>();
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assert_eq!(
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break_string(20, false, "", &graphemes[..]),
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SnippetState::LineEnd("Neque in sem. ".to_string(), 25)
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);
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assert_eq!(
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break_string(20, true, "", &graphemes[..]),
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SnippetState::LineEnd("Neque in sem.".to_string(), 25)
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);
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}
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#[test]
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fn newline_in_candidate_line() {
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let string = "Nulla\nconsequat erat at massa. Vivamus id mi.";
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let graphemes = UnicodeSegmentation::graphemes(&*string, false).collect::<Vec<&str>>();
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assert_eq!(
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break_string(25, false, "", &graphemes[..]),
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SnippetState::EndWithLineFeed("Nulla\n".to_string(), 6)
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);
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assert_eq!(
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break_string(25, true, "", &graphemes[..]),
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SnippetState::EndWithLineFeed("Nulla\n".to_string(), 6)
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);
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let mut config: Config = Default::default();
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config.set().max_width(27);
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let fmt = StringFormat::new(Shape::legacy(25, Indent::empty()), &config);
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let rewritten_string = rewrite_string(string, &fmt, 27);
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assert_eq!(
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rewritten_string,
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Some("\"Nulla\nconsequat erat at massa. \\\n Vivamus id mi.\"".to_string())
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);
|
|
}
|
|
|
|
#[test]
|
|
fn last_line_fit_with_trailing_whitespaces() {
|
|
let string = "Vivamus id mi. ";
|
|
let config: Config = Default::default();
|
|
let mut fmt = StringFormat::new(Shape::legacy(25, Indent::empty()), &config);
|
|
|
|
fmt.trim_end = true;
|
|
let rewritten_string = rewrite_string(string, &fmt, 25);
|
|
assert_eq!(rewritten_string, Some("\"Vivamus id mi.\"".to_string()));
|
|
|
|
fmt.trim_end = false; // default value of trim_end
|
|
let rewritten_string = rewrite_string(string, &fmt, 25);
|
|
assert_eq!(rewritten_string, Some("\"Vivamus id mi. \"".to_string()));
|
|
}
|
|
|
|
#[test]
|
|
fn last_line_fit_with_newline() {
|
|
let string = "Vivamus id mi.\nVivamus id mi.";
|
|
let config: Config = Default::default();
|
|
let fmt = StringFormat {
|
|
opener: "",
|
|
closer: "",
|
|
line_start: "// ",
|
|
line_end: "",
|
|
shape: Shape::legacy(100, Indent::from_width(&config, 4)),
|
|
trim_end: true,
|
|
config: &config,
|
|
};
|
|
|
|
let rewritten_string = rewrite_string(string, &fmt, 100);
|
|
assert_eq!(
|
|
rewritten_string,
|
|
Some("Vivamus id mi.\n // Vivamus id mi.".to_string())
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn overflow_in_non_string_content() {
|
|
let comment = "Aenean metus.\nVestibulum ac lacus. Vivamus porttitor";
|
|
let config: Config = Default::default();
|
|
let fmt = StringFormat {
|
|
opener: "",
|
|
closer: "",
|
|
line_start: "// ",
|
|
line_end: "",
|
|
shape: Shape::legacy(30, Indent::from_width(&config, 8)),
|
|
trim_end: true,
|
|
config: &config,
|
|
};
|
|
|
|
assert_eq!(
|
|
rewrite_string(comment, &fmt, 30),
|
|
Some(
|
|
"Aenean metus.\n // Vestibulum ac lacus. Vivamus\n // porttitor"
|
|
.to_string()
|
|
)
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn overflow_in_non_string_content_with_line_end() {
|
|
let comment = "Aenean metus.\nVestibulum ac lacus. Vivamus porttitor";
|
|
let config: Config = Default::default();
|
|
let fmt = StringFormat {
|
|
opener: "",
|
|
closer: "",
|
|
line_start: "// ",
|
|
line_end: "@",
|
|
shape: Shape::legacy(30, Indent::from_width(&config, 8)),
|
|
trim_end: true,
|
|
config: &config,
|
|
};
|
|
|
|
assert_eq!(
|
|
rewrite_string(comment, &fmt, 30),
|
|
Some(
|
|
"Aenean metus.\n // Vestibulum ac lacus. Vivamus@\n // porttitor"
|
|
.to_string()
|
|
)
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn blank_line_with_non_empty_line_start() {
|
|
let config: Config = Default::default();
|
|
let mut fmt = StringFormat {
|
|
opener: "",
|
|
closer: "",
|
|
line_start: "// ",
|
|
line_end: "",
|
|
shape: Shape::legacy(30, Indent::from_width(&config, 4)),
|
|
trim_end: true,
|
|
config: &config,
|
|
};
|
|
|
|
let comment = "Aenean metus. Vestibulum\n\nac lacus. Vivamus porttitor";
|
|
assert_eq!(
|
|
rewrite_string(comment, &fmt, 30),
|
|
Some(
|
|
"Aenean metus. Vestibulum\n //\n // ac lacus. Vivamus porttitor".to_string()
|
|
)
|
|
);
|
|
|
|
fmt.shape = Shape::legacy(15, Indent::from_width(&config, 4));
|
|
let comment = "Aenean\n\nmetus. Vestibulum ac lacus. Vivamus porttitor";
|
|
assert_eq!(
|
|
rewrite_string(comment, &fmt, 15),
|
|
Some(
|
|
r#"Aenean
|
|
//
|
|
// metus. Vestibulum
|
|
// ac lacus. Vivamus
|
|
// porttitor"#
|
|
.to_string()
|
|
)
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn retain_blank_lines() {
|
|
let config: Config = Default::default();
|
|
let fmt = StringFormat {
|
|
opener: "",
|
|
closer: "",
|
|
line_start: "// ",
|
|
line_end: "",
|
|
shape: Shape::legacy(20, Indent::from_width(&config, 4)),
|
|
trim_end: true,
|
|
config: &config,
|
|
};
|
|
|
|
let comment = "Aenean\n\nmetus. Vestibulum ac lacus.\n\n";
|
|
assert_eq!(
|
|
rewrite_string(comment, &fmt, 20),
|
|
Some(
|
|
"Aenean\n //\n // metus. Vestibulum ac\n // lacus.\n //\n".to_string()
|
|
)
|
|
);
|
|
|
|
let comment = "Aenean\n\nmetus. Vestibulum ac lacus.\n";
|
|
assert_eq!(
|
|
rewrite_string(comment, &fmt, 20),
|
|
Some("Aenean\n //\n // metus. Vestibulum ac\n // lacus.\n".to_string())
|
|
);
|
|
|
|
let comment = "Aenean\n \nmetus. Vestibulum ac lacus.";
|
|
assert_eq!(
|
|
rewrite_string(comment, &fmt, 20),
|
|
Some("Aenean\n //\n // metus. Vestibulum ac\n // lacus.".to_string())
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn boundary_on_edge() {
|
|
let config: Config = Default::default();
|
|
let mut fmt = StringFormat {
|
|
opener: "",
|
|
closer: "",
|
|
line_start: "// ",
|
|
line_end: "",
|
|
shape: Shape::legacy(13, Indent::from_width(&config, 4)),
|
|
trim_end: true,
|
|
config: &config,
|
|
};
|
|
|
|
let comment = "Aenean metus. Vestibulum ac lacus.";
|
|
assert_eq!(
|
|
rewrite_string(comment, &fmt, 13),
|
|
Some("Aenean metus.\n // Vestibulum ac\n // lacus.".to_string())
|
|
);
|
|
|
|
fmt.trim_end = false;
|
|
let comment = "Vestibulum ac lacus.";
|
|
assert_eq!(
|
|
rewrite_string(comment, &fmt, 13),
|
|
Some("Vestibulum \n // ac lacus.".to_string())
|
|
);
|
|
|
|
fmt.trim_end = true;
|
|
fmt.line_end = "\\";
|
|
let comment = "Vestibulum ac lacus.";
|
|
assert_eq!(
|
|
rewrite_string(comment, &fmt, 13),
|
|
Some("Vestibulum\\\n // ac lacus.".to_string())
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn detect_urls() {
|
|
let string = "aaa http://example.org something";
|
|
let graphemes = UnicodeSegmentation::graphemes(&*string, false).collect::<Vec<&str>>();
|
|
assert_eq!(detect_url(&graphemes, 8), Some(21));
|
|
|
|
let string = "https://example.org something";
|
|
let graphemes = UnicodeSegmentation::graphemes(&*string, false).collect::<Vec<&str>>();
|
|
assert_eq!(detect_url(&graphemes, 0), Some(18));
|
|
|
|
let string = "aaa ftp://example.org something";
|
|
let graphemes = UnicodeSegmentation::graphemes(&*string, false).collect::<Vec<&str>>();
|
|
assert_eq!(detect_url(&graphemes, 8), Some(20));
|
|
|
|
let string = "aaa file://example.org something";
|
|
let graphemes = UnicodeSegmentation::graphemes(&*string, false).collect::<Vec<&str>>();
|
|
assert_eq!(detect_url(&graphemes, 8), Some(21));
|
|
|
|
let string = "aaa http not an url";
|
|
let graphemes = UnicodeSegmentation::graphemes(&*string, false).collect::<Vec<&str>>();
|
|
assert_eq!(detect_url(&graphemes, 6), None);
|
|
|
|
let string = "aaa file://example.org";
|
|
let graphemes = UnicodeSegmentation::graphemes(&*string, false).collect::<Vec<&str>>();
|
|
assert_eq!(detect_url(&graphemes, 8), Some(21));
|
|
}
|
|
}
|