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Implement #[serde(rename_all = "Pascal_Snake")] #2773

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Implement #[serde(rename_all = "Pascal_Snake")] #2773

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81 changes: 60 additions & 21 deletions serde_derive/src/internals/case.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,8 @@ pub enum RenameRule {
KebabCase,
/// Rename direct children to "SCREAMING-KEBAB-CASE" style.
ScreamingKebabCase,
/// Rename direct children to "Pascal_Snake_Case" style.
PascalSnakeCase,
}

static RENAME_RULES: &[(&str, RenameRule)] = &[
Expand All @@ -39,6 +41,7 @@ static RENAME_RULES: &[(&str, RenameRule)] = &[
("SCREAMING_SNAKE_CASE", ScreamingSnakeCase),
("kebab-case", KebabCase),
("SCREAMING-KEBAB-CASE", ScreamingKebabCase),
("Pascal_Snake_Case", PascalSnakeCase),
];

impl RenameRule {
Expand Down Expand Up @@ -75,6 +78,16 @@ impl RenameRule {
ScreamingKebabCase => ScreamingSnakeCase
.apply_to_variant(variant)
.replace('_', "-"),
PascalSnakeCase => {
let mut pascal_snake = String::new();
for (i, ch) in variant.char_indices() {
if i > 0 && ch.is_uppercase() {
pascal_snake.push('_');
}
pascal_snake.push(ch);
}
pascal_snake
}
}
}

Expand Down Expand Up @@ -105,6 +118,23 @@ impl RenameRule {
ScreamingSnakeCase => field.to_ascii_uppercase(),
KebabCase => field.replace('_', "-"),
ScreamingKebabCase => ScreamingSnakeCase.apply_to_field(field).replace('_', "-"),
PascalSnakeCase => {
let mut pascal_snake = String::new();
let mut capitalize = true;
for ch in field.chars() {
let ch = if ch == '_' {
capitalize = true;
ch
} else if capitalize {
capitalize = false;
ch.to_ascii_uppercase()
} else {
ch
};
pascal_snake.push(ch);
}
pascal_snake
}
}
}

Expand Down Expand Up @@ -138,23 +168,29 @@ impl<'a> Display for ParseError<'a> {

#[test]
fn rename_variants() {
for &(original, lower, upper, camel, snake, screaming, kebab, screaming_kebab) in &[
(
"Outcome", "outcome", "OUTCOME", "outcome", "outcome", "OUTCOME", "outcome", "OUTCOME",
),
(
"VeryTasty",
"verytasty",
"VERYTASTY",
"veryTasty",
"very_tasty",
"VERY_TASTY",
"very-tasty",
"VERY-TASTY",
),
("A", "a", "A", "a", "a", "A", "a", "A"),
("Z42", "z42", "Z42", "z42", "z42", "Z42", "z42", "Z42"),
] {
for &(original, lower, upper, camel, snake, screaming, kebab, screaming_kebab, pascal_snake) in
&[
(
"Outcome", "outcome", "OUTCOME", "outcome", "outcome", "OUTCOME", "outcome",
"OUTCOME", "Outcome",
),
(
"VeryTasty",
"verytasty",
"VERYTASTY",
"veryTasty",
"very_tasty",
"VERY_TASTY",
"very-tasty",
"VERY-TASTY",
"Very_Tasty",
),
("A", "a", "A", "a", "a", "A", "a", "A", "A"),
(
"Z42", "z42", "Z42", "z42", "z42", "Z42", "z42", "Z42", "Z42",
),
]
{
assert_eq!(None.apply_to_variant(original), original);
assert_eq!(LowerCase.apply_to_variant(original), lower);
assert_eq!(UpperCase.apply_to_variant(original), upper);
Expand All @@ -167,14 +203,15 @@ fn rename_variants() {
ScreamingKebabCase.apply_to_variant(original),
screaming_kebab
);
assert_eq!(PascalSnakeCase.apply_to_variant(original), pascal_snake);
}
}

#[test]
fn rename_fields() {
for &(original, upper, pascal, camel, screaming, kebab, screaming_kebab) in &[
for &(original, upper, pascal, camel, screaming, kebab, screaming_kebab, pascal_snake) in &[
(
"outcome", "OUTCOME", "Outcome", "outcome", "OUTCOME", "outcome", "OUTCOME",
"outcome", "OUTCOME", "Outcome", "outcome", "OUTCOME", "outcome", "OUTCOME", "Outcome",
),
(
"very_tasty",
Expand All @@ -184,9 +221,10 @@ fn rename_fields() {
"VERY_TASTY",
"very-tasty",
"VERY-TASTY",
"Very_Tasty",
),
("a", "A", "A", "a", "A", "a", "A"),
("z42", "Z42", "Z42", "z42", "Z42", "z42", "Z42"),
("a", "A", "A", "a", "A", "a", "A", "A"),
("z42", "Z42", "Z42", "z42", "Z42", "z42", "Z42", "Z42"),
] {
assert_eq!(None.apply_to_field(original), original);
assert_eq!(UpperCase.apply_to_field(original), upper);
Expand All @@ -196,5 +234,6 @@ fn rename_fields() {
assert_eq!(ScreamingSnakeCase.apply_to_field(original), screaming);
assert_eq!(KebabCase.apply_to_field(original), kebab);
assert_eq!(ScreamingKebabCase.apply_to_field(original), screaming_kebab);
assert_eq!(PascalSnakeCase.apply_to_field(original), pascal_snake);
}
}