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// SPDX-FileCopyrightText: 2026 Sébastien Helleu <flashcode@flashtux.org>
//
// SPDX-License-Identifier: GPL-3.0-or-later
//! Format strings: Java `MessageFormat` language.
//!
//! Handle patterns like `{0}`, `{1,number}`, `{2,date,short}`,
//! `{0,choice,0#no files|1#one file|1<{0,number,integer} files}`.
//!
//! See: <https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/text/MessageFormat.html>.
use crate::po::format::FormatParser;
pub struct FormatJava;
impl FormatParser for FormatJava {
#[inline]
fn next_char(&self, s: &str, pos: usize) -> Option<(char, usize, bool)> {
match s[pos..].chars().next() {
Some('{') => match s[pos + 1..].chars().next() {
// A digit after '{' means the start of a format element.
Some(c) if c.is_ascii_digit() => Some(('{', pos + 1, true)),
// '{' not followed by a digit is a literal character.
_ => Some(('{', pos + 1, false)),
},
Some('\'') => {
// Quoted literal: skip everything between single quotes.
// "''" is an escaped single quote.
let new_pos = pos + 1;
if new_pos < s.len() && s.as_bytes()[new_pos] == b'\'' {
// Escaped single quote: "''" → literal "'".
Some(('\'', new_pos + 1, false))
} else {
// Skip until matching closing quote.
let mut end = new_pos;
while end < s.len() {
if s.as_bytes()[end] == b'\'' {
return Some(('\'', end + 1, false));
}
end += 1;
}
// No closing quote: treat as literal.
Some(('\'', new_pos, false))
}
}
Some(c) => Some((c, pos + c.len_utf8(), false)),
None => None,
}
}
#[inline]
fn find_end_format(&self, s: &str, pos: usize, len: usize) -> usize {
let bytes = s.as_bytes();
let mut pos_end = pos;
let mut depth = 1;
// Find the matching closing '}', accounting for nested format elements
// (e.g. in ChoiceFormat patterns).
while pos_end < len {
match bytes[pos_end] {
b'{' => depth += 1,
b'}' => {
depth -= 1;
if depth == 0 {
return pos_end + 1;
}
}
b'\'' => {
// Skip quoted literals inside the format element.
pos_end += 1;
if pos_end < len && bytes[pos_end] == b'\'' {
// Escaped quote "''" — skip the second quote.
pos_end += 1;
continue;
}
// Skip until closing quote.
while pos_end < len && bytes[pos_end] != b'\'' {
pos_end += 1;
}
if pos_end < len {
// Skip closing quote.
pos_end += 1;
}
continue;
}
_ => {}
}
pos_end += 1;
}
pos_end
}
}
#[cfg(test)]
mod tests {
use crate::po::format::{
iter::{
FormatEmailPos, FormatHtmlTagPos, FormatPathPos, FormatPos, FormatUrlPos, FormatWordPos,
},
language::Language,
strip_formats,
};
#[test]
fn test_strip_formats() {
assert_eq!(strip_formats("", Language::Java), "");
assert_eq!(
strip_formats("Hello, world!", Language::Java),
"Hello, world!"
);
assert_eq!(
strip_formats("Hello {0}, you have {1,number} items.", Language::Java),
"Hello , you have items."
);
assert_eq!(
strip_formats(
"{0,choice,0#no files|1#one file|1<{0,number,integer} files}",
Language::Java
),
""
);
}
#[test]
fn test_format_pos() {
assert!(FormatPos::new("", Language::Java).next().is_none());
assert!(
FormatPos::new("Hello, world!", Language::Java)
.next()
.is_none()
);
assert_eq!(
FormatPos::new("Name: {0}, age: {1}", Language::Java)
.map(|m| (m.s, m.start, m.end))
.collect::<Vec<_>>(),
vec![("{0}", 6, 9), ("{1}", 16, 19)]
);
// Formats with type.
assert_eq!(
FormatPos::new("{0,number} and {1,date,short}", Language::Java)
.map(|m| (m.s, m.start, m.end))
.collect::<Vec<_>>(),
vec![("{0,number}", 0, 10), ("{1,date,short}", 15, 29)]
);
// Complex ChoiceFormat pattern.
assert_eq!(
FormatPos::new(
"{0,choice,0#no files|1#one file|1<{0,number,integer} files}",
Language::Java
)
.map(|m| (m.s, m.start, m.end))
.collect::<Vec<_>>(),
vec![(
"{0,choice,0#no files|1#one file|1<{0,number,integer} files}",
0,
59
)]
);
// Quoted section: '{0}' inside quotes is not a format.
assert_eq!(
FormatPos::new("literal '{0}' and {1}", Language::Java)
.map(|m| (m.s, m.start, m.end))
.collect::<Vec<_>>(),
vec![("{1}", 18, 21)]
);
// "''" is an escaped single quote, not a quoting block.
assert_eq!(
FormatPos::new("it''s {0} o''clock", Language::Java)
.map(|m| (m.s, m.start, m.end))
.collect::<Vec<_>>(),
vec![("{0}", 6, 9)]
);
// '{' not followed by a digit is literal.
assert!(
FormatPos::new("{name} and {}", Language::Java)
.next()
.is_none()
);
// Quoted literal inside a format element.
assert_eq!(
FormatPos::new("{0,number,'#'#}", Language::Java)
.map(|m| (m.s, m.start, m.end))
.collect::<Vec<_>>(),
vec![("{0,number,'#'#}", 0, 15)]
);
}
#[test]
fn test_word_pos() {
assert!(FormatWordPos::new("", Language::Java).next().is_none());
assert_eq!(
FormatWordPos::new("Hello, world!", Language::Java)
.map(|m| (m.s, m.start, m.end))
.collect::<Vec<_>>(),
vec![("Hello", 0, 5), ("world", 7, 12)]
);
assert_eq!(
FormatWordPos::new("Name: {0}, age: {1,number}", Language::Java)
.map(|m| (m.s, m.start, m.end))
.collect::<Vec<_>>(),
vec![("Name", 0, 4), ("age", 11, 14)]
);
}
#[test]
fn test_url_pos() {
assert!(FormatUrlPos::new("", Language::Java).next().is_none());
assert!(
FormatUrlPos::new("Hello, world!", Language::Java)
.next()
.is_none()
);
assert_eq!(
FormatUrlPos::new(
"Invalid URL: https://example, valid URL: https://example.com",
Language::Java
)
.map(|m| (m.s, m.start, m.end))
.collect::<Vec<_>>(),
vec![("https://example.com", 41, 60)]
);
assert_eq!(
FormatUrlPos::new(
"Test https://{0}.example.com https://example2.com",
Language::Java
)
.map(|m| (m.s, m.start, m.end))
.collect::<Vec<_>>(),
vec![
("https://{0}.example.com", 5, 28),
("https://example2.com", 29, 49),
]
);
}
#[test]
fn test_email_pos() {
assert!(FormatEmailPos::new("", Language::Java).next().is_none());
assert!(
FormatEmailPos::new("Hello, world!", Language::Java)
.next()
.is_none()
);
assert_eq!(
FormatEmailPos::new(
"Contact us at user@example.com for more info.",
Language::Java
)
.map(|m| (m.s, m.start, m.end))
.collect::<Vec<_>>(),
vec![("user@example.com", 14, 30)]
);
assert_eq!(
FormatEmailPos::new(
"Invalid email: user@domain, valid email: user@{0}.domain.com",
Language::Java
)
.map(|m| (m.s, m.start, m.end))
.collect::<Vec<_>>(),
vec![("user@{0}.domain.com", 41, 60)]
);
}
#[test]
fn test_path_pos() {
assert!(FormatPathPos::new("", Language::Java).next().is_none());
assert!(
FormatPathPos::new("Hello, world!", Language::Java)
.next()
.is_none()
);
assert_eq!(
FormatPathPos::new("File: /home/{0}/data.txt", Language::Java)
.map(|m| (m.s, m.start, m.end))
.collect::<Vec<_>>(),
vec![("/home/{0}/data.txt", 6, 24)]
);
}
#[test]
fn test_html_tags_pos() {
assert!(FormatHtmlTagPos::new("", Language::Java).next().is_none());
assert!(
FormatHtmlTagPos::new("Hello, world!", Language::Java)
.next()
.is_none()
);
assert_eq!(
FormatHtmlTagPos::new("Hello <b>{0}</b>!", Language::Java)
.map(|m| (m.s, m.start, m.end))
.collect::<Vec<_>>(),
vec![("<b>", 6, 9), ("</b>", 12, 16)]
);
}
}