summaryrefslogtreecommitdiffstats
path: root/src/tools/rustfmt/src/string.rs
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--src/tools/rustfmt/src/string.rs725
1 files changed, 725 insertions, 0 deletions
diff --git a/src/tools/rustfmt/src/string.rs b/src/tools/rustfmt/src/string.rs
new file mode 100644
index 000000000..78b72a50c
--- /dev/null
+++ b/src/tools/rustfmt/src/string.rs
@@ -0,0 +1,725 @@
+// Format string literals.
+
+use regex::Regex;
+use unicode_categories::UnicodeCategories;
+use unicode_segmentation::UnicodeSegmentation;
+
+use crate::config::Config;
+use crate::shape::Shape;
+use crate::utils::{unicode_str_width, wrap_str};
+
+const MIN_STRING: usize = 10;
+
+/// Describes the layout of a piece of text.
+pub(crate) struct StringFormat<'a> {
+ /// The opening sequence of characters for the piece of text
+ pub(crate) opener: &'a str,
+ /// The closing sequence of characters for the piece of text
+ pub(crate) closer: &'a str,
+ /// The opening sequence of characters for a line
+ pub(crate) line_start: &'a str,
+ /// The closing sequence of characters for a line
+ pub(crate) line_end: &'a str,
+ /// The allocated box to fit the text into
+ pub(crate) shape: Shape,
+ /// Trim trailing whitespaces
+ pub(crate) trim_end: bool,
+ pub(crate) config: &'a Config,
+}
+
+impl<'a> StringFormat<'a> {
+ pub(crate) fn new(shape: Shape, config: &'a Config) -> StringFormat<'a> {
+ StringFormat {
+ opener: "\"",
+ closer: "\"",
+ line_start: " ",
+ line_end: "\\",
+ shape,
+ trim_end: false,
+ config,
+ }
+ }
+
+ /// Returns the maximum number of graphemes that is possible on a line while taking the
+ /// indentation into account.
+ ///
+ /// If we cannot put at least a single character per line, the rewrite won't succeed.
+ fn max_width_with_indent(&self) -> Option<usize> {
+ Some(
+ self.shape
+ .width
+ .checked_sub(self.opener.len() + self.line_end.len() + 1)?
+ + 1,
+ )
+ }
+
+ /// Like max_width_with_indent but the indentation is not subtracted.
+ /// This allows to fit more graphemes from the string on a line when
+ /// SnippetState::EndWithLineFeed.
+ fn max_width_without_indent(&self) -> Option<usize> {
+ self.config.max_width().checked_sub(self.line_end.len())
+ }
+}
+
+pub(crate) fn rewrite_string<'a>(
+ orig: &str,
+ fmt: &StringFormat<'a>,
+ newline_max_chars: usize,
+) -> Option<String> {
+ let max_width_with_indent = fmt.max_width_with_indent()?;
+ let max_width_without_indent = fmt.max_width_without_indent()?;
+ let indent_with_newline = fmt.shape.indent.to_string_with_newline(fmt.config);
+ let indent_without_newline = fmt.shape.indent.to_string(fmt.config);
+
+ // Strip line breaks.
+ // With this regex applied, all remaining whitespaces are significant
+ let strip_line_breaks_re = Regex::new(r"([^\\](\\\\)*)\\[\n\r][[:space:]]*").unwrap();
+ let stripped_str = strip_line_breaks_re.replace_all(orig, "$1");
+
+ let graphemes = UnicodeSegmentation::graphemes(&*stripped_str, false).collect::<Vec<&str>>();
+
+ // `cur_start` is the position in `orig` of the start of the current line.
+ let mut cur_start = 0;
+ let mut result = String::with_capacity(
+ stripped_str
+ .len()
+ .checked_next_power_of_two()
+ .unwrap_or(usize::max_value()),
+ );
+ result.push_str(fmt.opener);
+
+ // Snip a line at a time from `stripped_str` until it is used up. Push the snippet
+ // onto result.
+ let mut cur_max_width = max_width_with_indent;
+ let is_bareline_ok = fmt.line_start.is_empty() || is_whitespace(fmt.line_start);
+ loop {
+ // All the input starting at cur_start fits on the current line
+ if graphemes_width(&graphemes[cur_start..]) <= cur_max_width {
+ for (i, grapheme) in graphemes[cur_start..].iter().enumerate() {
+ if is_new_line(grapheme) {
+ // take care of blank lines
+ result = trim_end_but_line_feed(fmt.trim_end, result);
+ result.push('\n');
+ if !is_bareline_ok && cur_start + i + 1 < graphemes.len() {
+ result.push_str(&indent_without_newline);
+ result.push_str(fmt.line_start);
+ }
+ } else {
+ result.push_str(grapheme);
+ }
+ }
+ result = trim_end_but_line_feed(fmt.trim_end, result);
+ break;
+ }
+
+ // The input starting at cur_start needs to be broken
+ match break_string(
+ cur_max_width,
+ fmt.trim_end,
+ fmt.line_end,
+ &graphemes[cur_start..],
+ ) {
+ SnippetState::LineEnd(line, len) => {
+ result.push_str(&line);
+ result.push_str(fmt.line_end);
+ result.push_str(&indent_with_newline);
+ result.push_str(fmt.line_start);
+ cur_max_width = newline_max_chars;
+ cur_start += len;
+ }
+ SnippetState::EndWithLineFeed(line, len) => {
+ if line == "\n" && fmt.trim_end {
+ result = result.trim_end().to_string();
+ }
+ result.push_str(&line);
+ if is_bareline_ok {
+ // the next line can benefit from the full width
+ cur_max_width = max_width_without_indent;
+ } else {
+ result.push_str(&indent_without_newline);
+ result.push_str(fmt.line_start);
+ cur_max_width = max_width_with_indent;
+ }
+ cur_start += len;
+ }
+ SnippetState::EndOfInput(line) => {
+ result.push_str(&line);
+ break;
+ }
+ }
+ }
+
+ result.push_str(fmt.closer);
+ wrap_str(result, fmt.config.max_width(), fmt.shape)
+}
+
+/// Returns the index to the end of the URL if the split at index of the given string includes a
+/// URL or alike. Otherwise, returns `None`.
+fn detect_url(s: &[&str], index: usize) -> Option<usize> {
+ let start = match s[..=index].iter().rposition(|g| is_whitespace(g)) {
+ Some(pos) => pos + 1,
+ None => 0,
+ };
+ // 8 = minimum length for a string to contain a URL
+ if s.len() < start + 8 {
+ return None;
+ }
+ let split = s[start..].concat();
+ if split.contains("https://")
+ || split.contains("http://")
+ || split.contains("ftp://")
+ || split.contains("file://")
+ {
+ match s[index..].iter().position(|g| is_whitespace(g)) {
+ Some(pos) => Some(index + pos - 1),
+ None => Some(s.len() - 1),
+ }
+ } else {
+ None
+ }
+}
+
+/// Trims whitespaces to the right except for the line feed character.
+fn trim_end_but_line_feed(trim_end: bool, result: String) -> String {
+ let whitespace_except_line_feed = |c: char| c.is_whitespace() && c != '\n';
+ if trim_end && result.ends_with(whitespace_except_line_feed) {
+ result
+ .trim_end_matches(whitespace_except_line_feed)
+ .to_string()
+ } else {
+ result
+ }
+}
+
+/// Result of breaking a string so it fits in a line and the state it ended in.
+/// The state informs about what to do with the snippet and how to continue the breaking process.
+#[derive(Debug, PartialEq)]
+enum SnippetState {
+ /// The input could not be broken and so rewriting the string is finished.
+ EndOfInput(String),
+ /// The input could be broken and the returned snippet should be ended with a
+ /// `[StringFormat::line_end]`. The next snippet needs to be indented.
+ ///
+ /// The returned string is the line to print out and the number is the length that got read in
+ /// the text being rewritten. That length may be greater than the returned string if trailing
+ /// whitespaces got trimmed.
+ LineEnd(String, usize),
+ /// The input could be broken but a newline is present that cannot be trimmed. The next snippet
+ /// to be rewritten *could* use more width than what is specified by the given shape. For
+ /// example with a multiline string, the next snippet does not need to be indented, allowing
+ /// more characters to be fit within a line.
+ ///
+ /// The returned string is the line to print out and the number is the length that got read in
+ /// the text being rewritten.
+ EndWithLineFeed(String, usize),
+}
+
+fn not_whitespace_except_line_feed(g: &str) -> bool {
+ is_new_line(g) || !is_whitespace(g)
+}
+
+/// Break the input string at a boundary character around the offset `max_width`. A boundary
+/// character is either a punctuation or a whitespace.
+/// FIXME(issue#3281): We must follow UAX#14 algorithm instead of this.
+fn break_string(max_width: usize, trim_end: bool, line_end: &str, input: &[&str]) -> SnippetState {
+ let break_at = |index /* grapheme at index is included */| {
+ // Take in any whitespaces to the left/right of `input[index]` while
+ // preserving line feeds
+ let index_minus_ws = input[0..=index]
+ .iter()
+ .rposition(|grapheme| not_whitespace_except_line_feed(grapheme))
+ .unwrap_or(index);
+ // Take into account newlines occurring in input[0..=index], i.e., the possible next new
+ // line. If there is one, then text after it could be rewritten in a way that the available
+ // space is fully used.
+ for (i, grapheme) in input[0..=index].iter().enumerate() {
+ if is_new_line(grapheme) {
+ if i <= index_minus_ws {
+ let mut line = &input[0..i].concat()[..];
+ if trim_end {
+ line = line.trim_end();
+ }
+ return SnippetState::EndWithLineFeed(format!("{}\n", line), i + 1);
+ }
+ break;
+ }
+ }
+
+ let mut index_plus_ws = index;
+ for (i, grapheme) in input[index + 1..].iter().enumerate() {
+ if !trim_end && is_new_line(grapheme) {
+ return SnippetState::EndWithLineFeed(
+ input[0..=index + 1 + i].concat(),
+ index + 2 + i,
+ );
+ } else if not_whitespace_except_line_feed(grapheme) {
+ index_plus_ws = index + i;
+ break;
+ }
+ }
+
+ if trim_end {
+ SnippetState::LineEnd(input[0..=index_minus_ws].concat(), index_plus_ws + 1)
+ } else {
+ SnippetState::LineEnd(input[0..=index_plus_ws].concat(), index_plus_ws + 1)
+ }
+ };
+
+ // find a first index where the unicode width of input[0..x] become > max_width
+ let max_width_index_in_input = {
+ let mut cur_width = 0;
+ let mut cur_index = 0;
+ for (i, grapheme) in input.iter().enumerate() {
+ cur_width += unicode_str_width(grapheme);
+ cur_index = i;
+ if cur_width > max_width {
+ break;
+ }
+ }
+ cur_index
+ };
+ if max_width_index_in_input == 0 {
+ return SnippetState::EndOfInput(input.concat());
+ }
+
+ // Find the position in input for breaking the string
+ if line_end.is_empty()
+ && trim_end
+ && !is_whitespace(input[max_width_index_in_input - 1])
+ && is_whitespace(input[max_width_index_in_input])
+ {
+ // At a breaking point already
+ // The line won't invalidate the rewriting because:
+ // - no extra space needed for the line_end character
+ // - extra whitespaces to the right can be trimmed
+ return break_at(max_width_index_in_input - 1);
+ }
+ if let Some(url_index_end) = detect_url(input, max_width_index_in_input) {
+ let index_plus_ws = url_index_end
+ + input[url_index_end..]
+ .iter()
+ .skip(1)
+ .position(|grapheme| not_whitespace_except_line_feed(grapheme))
+ .unwrap_or(0);
+ return if trim_end {
+ SnippetState::LineEnd(input[..=url_index_end].concat(), index_plus_ws + 1)
+ } else {
+ SnippetState::LineEnd(input[..=index_plus_ws].concat(), index_plus_ws + 1)
+ };
+ }
+
+ match input[0..max_width_index_in_input]
+ .iter()
+ .rposition(|grapheme| is_whitespace(grapheme))
+ {
+ // Found a whitespace and what is on its left side is big enough.
+ Some(index) if index >= MIN_STRING => break_at(index),
+ // No whitespace found, try looking for a punctuation instead
+ _ => match (0..max_width_index_in_input)
+ .rev()
+ .skip_while(|pos| !is_valid_linebreak(input, *pos))
+ .next()
+ {
+ // Found a punctuation and what is on its left side is big enough.
+ Some(index) if index >= MIN_STRING => break_at(index),
+ // Either no boundary character was found to the left of `input[max_chars]`, or the line
+ // got too small. We try searching for a boundary character to the right.
+ _ => match (max_width_index_in_input..input.len())
+ .skip_while(|pos| !is_valid_linebreak(input, *pos))
+ .next()
+ {
+ // A boundary was found after the line limit
+ Some(index) => break_at(index),
+ // No boundary to the right, the input cannot be broken
+ None => SnippetState::EndOfInput(input.concat()),
+ },
+ },
+ }
+}
+
+fn is_valid_linebreak(input: &[&str], pos: usize) -> bool {
+ let is_whitespace = is_whitespace(input[pos]);
+ if is_whitespace {
+ return true;
+ }
+ let is_punctuation = is_punctuation(input[pos]);
+ if is_punctuation && !is_part_of_type(input, pos) {
+ return true;
+ }
+ false
+}
+
+fn is_part_of_type(input: &[&str], pos: usize) -> bool {
+ input.get(pos..=pos + 1) == Some(&[":", ":"])
+ || input.get(pos.saturating_sub(1)..=pos) == Some(&[":", ":"])
+}
+
+fn is_new_line(grapheme: &str) -> bool {
+ let bytes = grapheme.as_bytes();
+ bytes.starts_with(b"\n") || bytes.starts_with(b"\r\n")
+}
+
+fn is_whitespace(grapheme: &str) -> bool {
+ grapheme.chars().all(char::is_whitespace)
+}
+
+fn is_punctuation(grapheme: &str) -> bool {
+ grapheme
+ .chars()
+ .all(UnicodeCategories::is_punctuation_other)
+}
+
+fn graphemes_width(graphemes: &[&str]) -> usize {
+ graphemes.iter().map(|s| unicode_str_width(s)).sum()
+}
+
+#[cfg(test)]
+mod test {
+ use super::{break_string, detect_url, rewrite_string, SnippetState, StringFormat};
+ use crate::config::Config;
+ use crate::shape::{Indent, Shape};
+ use unicode_segmentation::UnicodeSegmentation;
+
+ #[test]
+ fn issue343() {
+ let config = Default::default();
+ let fmt = StringFormat::new(Shape::legacy(2, Indent::empty()), &config);
+ rewrite_string("eq_", &fmt, 2);
+ }
+
+ #[test]
+ fn line_break_at_valid_points_test() {
+ let string = "[TheName](Dont::break::my::type::That::would::be::very::nice) break here";
+ let graphemes = UnicodeSegmentation::graphemes(&*string, false).collect::<Vec<&str>>();
+ assert_eq!(
+ break_string(20, false, "", &graphemes[..]),
+ SnippetState::LineEnd(
+ "[TheName](Dont::break::my::type::That::would::be::very::nice) ".to_string(),
+ 62
+ )
+ );
+ }
+
+ #[test]
+ fn should_break_on_whitespace() {
+ let string = "Placerat felis. Mauris porta ante sagittis purus.";
+ let graphemes = UnicodeSegmentation::graphemes(&*string, false).collect::<Vec<&str>>();
+ assert_eq!(
+ break_string(20, false, "", &graphemes[..]),
+ SnippetState::LineEnd("Placerat felis. ".to_string(), 16)
+ );
+ assert_eq!(
+ break_string(20, true, "", &graphemes[..]),
+ SnippetState::LineEnd("Placerat felis.".to_string(), 16)
+ );
+ }
+
+ #[test]
+ fn should_break_on_punctuation() {
+ let string = "Placerat_felis._Mauris_porta_ante_sagittis_purus.";
+ let graphemes = UnicodeSegmentation::graphemes(&*string, false).collect::<Vec<&str>>();
+ assert_eq!(
+ break_string(20, false, "", &graphemes[..]),
+ SnippetState::LineEnd("Placerat_felis.".to_string(), 15)
+ );
+ }
+
+ #[test]
+ fn should_break_forward() {
+ let string = "Venenatis_tellus_vel_tellus. Aliquam aliquam dolor at justo.";
+ let graphemes = UnicodeSegmentation::graphemes(&*string, false).collect::<Vec<&str>>();
+ assert_eq!(
+ break_string(20, false, "", &graphemes[..]),
+ SnippetState::LineEnd("Venenatis_tellus_vel_tellus. ".to_string(), 29)
+ );
+ assert_eq!(
+ break_string(20, true, "", &graphemes[..]),
+ SnippetState::LineEnd("Venenatis_tellus_vel_tellus.".to_string(), 29)
+ );
+ }
+
+ #[test]
+ fn nothing_to_break() {
+ let string = "Venenatis_tellus_vel_tellus";
+ let graphemes = UnicodeSegmentation::graphemes(&*string, false).collect::<Vec<&str>>();
+ assert_eq!(
+ break_string(20, false, "", &graphemes[..]),
+ SnippetState::EndOfInput("Venenatis_tellus_vel_tellus".to_string())
+ );
+ }
+
+ #[test]
+ fn significant_whitespaces() {
+ let string = "Neque in sem. \n Pellentesque tellus augue.";
+ let graphemes = UnicodeSegmentation::graphemes(&*string, false).collect::<Vec<&str>>();
+ assert_eq!(
+ break_string(15, false, "", &graphemes[..]),
+ SnippetState::EndWithLineFeed("Neque in sem. \n".to_string(), 20)
+ );
+ assert_eq!(
+ break_string(25, false, "", &graphemes[..]),
+ SnippetState::EndWithLineFeed("Neque in sem. \n".to_string(), 20)
+ );
+
+ assert_eq!(
+ break_string(15, true, "", &graphemes[..]),
+ SnippetState::LineEnd("Neque in sem.".to_string(), 19)
+ );
+ assert_eq!(
+ break_string(25, true, "", &graphemes[..]),
+ SnippetState::EndWithLineFeed("Neque in sem.\n".to_string(), 20)
+ );
+ }
+
+ #[test]
+ fn big_whitespace() {
+ let string = "Neque in sem. Pellentesque tellus augue.";
+ let graphemes = UnicodeSegmentation::graphemes(&*string, false).collect::<Vec<&str>>();
+ assert_eq!(
+ break_string(20, false, "", &graphemes[..]),
+ SnippetState::LineEnd("Neque in sem. ".to_string(), 25)
+ );
+ assert_eq!(
+ break_string(20, true, "", &graphemes[..]),
+ SnippetState::LineEnd("Neque in sem.".to_string(), 25)
+ );
+ }
+
+ #[test]
+ fn newline_in_candidate_line() {
+ let string = "Nulla\nconsequat erat at massa. Vivamus id mi.";
+
+ let graphemes = UnicodeSegmentation::graphemes(&*string, false).collect::<Vec<&str>>();
+ assert_eq!(
+ break_string(25, false, "", &graphemes[..]),
+ SnippetState::EndWithLineFeed("Nulla\n".to_string(), 6)
+ );
+ assert_eq!(
+ break_string(25, true, "", &graphemes[..]),
+ SnippetState::EndWithLineFeed("Nulla\n".to_string(), 6)
+ );
+
+ let mut config: Config = Default::default();
+ config.set().max_width(27);
+ let fmt = StringFormat::new(Shape::legacy(25, Indent::empty()), &config);
+ let rewritten_string = rewrite_string(string, &fmt, 27);
+ assert_eq!(
+ rewritten_string,
+ Some("\"Nulla\nconsequat erat at massa. \\\n Vivamus id mi.\"".to_string())
+ );
+ }
+
+ #[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));
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-27 08:43:48 +0000