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Unit test file:row:column parsing

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This commit is contained in:
Kirill Bulatov 2023-05-16 20:48:19 +03:00
parent be7a58b508
commit 5d4fc99750
2 changed files with 170 additions and 29 deletions
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2
crates/cli/src/main.rs
View File

@ -79,7 +79,7 @@ fn main() -> Result<()> {
.paths_with_position
.into_iter()
.map(|path_with_position| {
let path_with_position = path_with_position.convert_path(|path| {
let path_with_position = path_with_position.map_path_like(|path| {
fs::canonicalize(&path)
.with_context(|| format!("path {path:?} canonicalization"))
})?;

197
crates/util/src/paths.rs
View File

@ -73,43 +73,80 @@ pub fn compact(path: &Path) -> PathBuf {
}
}
/// A delimiter to use in `path_query:row_number:column_number` strings parsing.
pub const FILE_ROW_COLUMN_DELIMITER: char = ':';
#[derive(Debug, Clone, Serialize, Deserialize)]
/// A representation of a path-like string with optional row and column numbers.
/// Matching values example: `te`, `test.rs:22`, `te:22:5`, etc.
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct PathLikeWithPosition<P> {
pub path_like: P,
pub row: Option<u32>,
// Absent if row is absent.
pub column: Option<u32>,
}
impl<P> PathLikeWithPosition<P> {
pub fn parse_str<F, E>(s: &str, parse_path_like_str: F) -> Result<Self, E>
where
F: Fn(&str) -> Result<P, E>,
{
let mut components = s.splitn(3, FILE_ROW_COLUMN_DELIMITER).map(str::trim).fuse();
let path_like_str = components.next().filter(|str| !str.is_empty());
let row = components.next().and_then(|row| row.parse::<u32>().ok());
let column = components
.next()
.filter(|_| row.is_some())
.and_then(|col| col.parse::<u32>().ok());
Ok(match path_like_str {
Some(path_like_str) => Self {
path_like: parse_path_like_str(path_like_str)?,
row,
column,
},
None => Self {
path_like: parse_path_like_str(s)?,
/// Parses a string that possibly has `:row:column` suffix.
/// Ignores trailing `:`s, so `test.rs:22:` is parsed as `test.rs:22`.
/// If any of the row/column component parsing fails, the whole string is then parsed as a path like.
pub fn parse_str<E>(
s: &str,
parse_path_like_str: impl Fn(&str) -> Result<P, E>,
) -> Result<Self, E> {
let fallback = |fallback_str| {
Ok(Self {
path_like: parse_path_like_str(fallback_str)?,
row: None,
column: None,
},
})
})
};
match s.trim().split_once(FILE_ROW_COLUMN_DELIMITER) {
Some((path_like_str, maybe_row_and_col_str)) => {
let path_like_str = path_like_str.trim();
let maybe_row_and_col_str = maybe_row_and_col_str.trim();
if path_like_str.is_empty() {
fallback(s)
} else if maybe_row_and_col_str.is_empty() {
fallback(path_like_str)
} else {
let (row_parse_result, maybe_col_str) =
match maybe_row_and_col_str.split_once(FILE_ROW_COLUMN_DELIMITER) {
Some((maybe_row_str, maybe_col_str)) => {
(maybe_row_str.parse::<u32>(), maybe_col_str.trim())
}
None => (maybe_row_and_col_str.parse::<u32>(), ""),
};
match row_parse_result {
Ok(row) => {
if maybe_col_str.is_empty() {
Ok(Self {
path_like: parse_path_like_str(path_like_str)?,
row: Some(row),
column: None,
})
} else {
match maybe_col_str.parse::<u32>() {
Ok(col) => Ok(Self {
path_like: parse_path_like_str(path_like_str)?,
row: Some(row),
column: Some(col),
}),
Err(_) => fallback(s),
}
}
}
Err(_) => fallback(s),
}
}
}
None => fallback(s),
}
}
pub fn convert_path<P2, E>(
pub fn map_path_like<P2, E>(
self,
mapping: impl FnOnce(P) -> Result<P2, E>,
) -> Result<PathLikeWithPosition<P2>, E> {
@ -120,10 +157,7 @@ impl<P> PathLikeWithPosition<P> {
})
}
pub fn to_string<F>(&self, path_like_to_string: F) -> String
where
F: Fn(&P) -> String,
{
pub fn to_string(&self, path_like_to_string: impl Fn(&P) -> String) -> String {
let path_like_string = path_like_to_string(&self.path_like);
if let Some(row) = self.row {
if let Some(column) = self.column {
@ -136,3 +170,110 @@ impl<P> PathLikeWithPosition<P> {
}
}
}
#[cfg(test)]
mod tests {
use super::*;
type TestPath = PathLikeWithPosition<String>;
fn parse_str(s: &str) -> TestPath {
TestPath::parse_str(s, |s| Ok::<_, std::convert::Infallible>(s.to_string()))
.expect("infallible")
}
#[test]
fn path_with_position_parsing_positive() {
let input_and_expected = [
(
"test_file.rs",
PathLikeWithPosition {
path_like: "test_file.rs".to_string(),
row: None,
column: None,
},
),
(
"test_file.rs:1",
PathLikeWithPosition {
path_like: "test_file.rs".to_string(),
row: Some(1),
column: None,
},
),
(
"test_file.rs:1:2",
PathLikeWithPosition {
path_like: "test_file.rs".to_string(),
row: Some(1),
column: Some(2),
},
),
];
for (input, expected) in input_and_expected {
let actual = parse_str(input);
assert_eq!(
actual, expected,
"For positive case input str '{input}', got a parse mismatch"
);
}
}
#[test]
fn path_with_position_parsing_negative() {
for input in [
"test_file.rs:a",
"test_file.rs:a:b",
"test_file.rs::",
"test_file.rs::1",
"test_file.rs:1::",
"test_file.rs::1:2",
"test_file.rs:1::2",
"test_file.rs:1:2:",
"test_file.rs:1:2:3",
] {
let actual = parse_str(input);
assert_eq!(
actual,
PathLikeWithPosition {
path_like: input.to_string(),
row: None,
column: None,
},
"For negative case input str '{input}', got a parse mismatch"
);
}
}
// Trim off trailing `:`s for otherwise valid input.
#[test]
fn path_with_position_parsing_special() {
let input_and_expected = [
(
"test_file.rs:",
PathLikeWithPosition {
path_like: "test_file.rs".to_string(),
row: None,
column: None,
},
),
(
"test_file.rs:1:",
PathLikeWithPosition {
path_like: "test_file.rs".to_string(),
row: Some(1),
column: None,
},
),
];
for (input, expected) in input_and_expected {
let actual = parse_str(input);
assert_eq!(
actual, expected,
"For special case input str '{input}', got a parse mismatch"
);
}
}
}