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feat: implement rename_all in derive(ValueDeserialize) (#1094)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,201 @@ | ||
| use std::str::FromStr; | ||
|
|
||
| #[derive(Debug, Clone, Copy)] | ||
| /// Rules to rename all fields in an InputObject or variants in an Enum | ||
| /// as GraphQL naming conventions usually don't match rust | ||
| pub enum RenameAll { | ||
| None, | ||
| /// For names that are entirely lowercase in GraphQL: `myfield` | ||
| Lowercase, | ||
| /// For names that are entirely uppercase in GraphQL: `MYFIELD` | ||
| Uppercase, | ||
| /// For names that are entirely pascal case in GraphQL: `MyField` | ||
| PascalCase, | ||
| /// For names that are entirely camel case in GraphQL: `myField` | ||
| CamelCase, | ||
| /// For names that are entirely snake case in GraphQL: `my_field` | ||
| SnakeCase, | ||
| /// For names that are entirely snake case in GraphQL: `MY_FIELD` | ||
| ScreamingSnakeCase, | ||
| } | ||
|
|
||
| impl RenameAll { | ||
| pub(super) fn apply(&self, string: impl AsRef<str>) -> String { | ||
| match self { | ||
| RenameAll::Lowercase => string.as_ref().to_lowercase(), | ||
| RenameAll::Uppercase => string.as_ref().to_uppercase(), | ||
| RenameAll::PascalCase => to_pascal_case(string.as_ref()), | ||
| RenameAll::CamelCase => to_camel_case(string.as_ref()), | ||
| RenameAll::SnakeCase => to_snake_case(string.as_ref()), | ||
| RenameAll::ScreamingSnakeCase => to_snake_case(string.as_ref()).to_uppercase(), | ||
| RenameAll::None => string.as_ref().to_string(), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl FromStr for RenameAll { | ||
| type Err = String; | ||
|
|
||
| fn from_str(s: &str) -> Result<Self, Self::Err> { | ||
| match s.to_lowercase().as_ref() { | ||
| "none" => Ok(RenameAll::None), | ||
| "lowercase" => Ok(RenameAll::Lowercase), | ||
| "uppercase" => Ok(RenameAll::Uppercase), | ||
| "pascalcase" => Ok(RenameAll::PascalCase), | ||
| "camelcase" => Ok(RenameAll::CamelCase), | ||
| "snake_case" => Ok(RenameAll::SnakeCase), | ||
| "screaming_snake_case" => Ok(RenameAll::ScreamingSnakeCase), | ||
| case => { | ||
| Err(format!("unknown case: {case}. expected one of lowercase, UPPERCASE, PascalCAse, camelCase, snake_case, SCREAMING_SNAKE_CASE")) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| pub fn to_snake_case(s: &str) -> String { | ||
| let mut buf = String::with_capacity(s.len()); | ||
| // Setting this to true to avoid adding underscores at the beginning | ||
| let mut prev_is_upper = true; | ||
| for c in s.chars() { | ||
| if c.is_uppercase() && !prev_is_upper { | ||
| buf.push('_'); | ||
| buf.extend(c.to_lowercase()); | ||
| prev_is_upper = true; | ||
| } else if c.is_uppercase() { | ||
| buf.extend(c.to_lowercase()); | ||
| } else { | ||
| prev_is_upper = false; | ||
| buf.push(c); | ||
| } | ||
| } | ||
| buf | ||
| } | ||
|
|
||
| pub fn to_pascal_case(s: &str) -> String { | ||
| let mut buf = String::with_capacity(s.len()); | ||
| let mut first_char = true; | ||
| let mut prev_is_upper = false; | ||
| let mut prev_is_underscore = false; | ||
| let mut chars = s.chars().peekable(); | ||
| loop { | ||
| let c = chars.next(); | ||
| if c.is_none() { | ||
| break; | ||
| } | ||
| let c = c.unwrap(); | ||
| if first_char { | ||
| if c == '_' { | ||
| // keep leading underscores | ||
| buf.push('_'); | ||
| while let Some('_') = chars.peek() { | ||
| buf.push(chars.next().unwrap()); | ||
| } | ||
| } else if c.is_uppercase() { | ||
| prev_is_upper = true; | ||
| buf.push(c); | ||
| } else { | ||
| buf.extend(c.to_uppercase()); | ||
| } | ||
| first_char = false; | ||
| continue; | ||
| } | ||
|
|
||
| if c.is_uppercase() { | ||
| if prev_is_upper { | ||
| buf.extend(c.to_lowercase()); | ||
| } else { | ||
| buf.push(c); | ||
| } | ||
| prev_is_upper = true; | ||
| } else if c == '_' { | ||
| prev_is_underscore = true; | ||
| prev_is_upper = false; | ||
| } else { | ||
| if prev_is_upper { | ||
| buf.extend(c.to_lowercase()) | ||
| } else if prev_is_underscore { | ||
| buf.extend(c.to_uppercase()); | ||
| } else { | ||
| buf.push(c); | ||
| } | ||
| prev_is_upper = false; | ||
| prev_is_underscore = false; | ||
| } | ||
| } | ||
|
|
||
| buf | ||
| } | ||
|
|
||
| pub(super) fn to_camel_case(s: &str) -> String { | ||
| let s = to_pascal_case(s); | ||
|
|
||
| let mut buf = String::with_capacity(s.len()); | ||
| let mut chars = s.chars(); | ||
|
|
||
| if let Some(first_char) = chars.next() { | ||
| buf.extend(first_char.to_lowercase()); | ||
| } | ||
|
|
||
| buf.extend(chars); | ||
|
|
||
| buf | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| mod tests { | ||
| use super::*; | ||
|
|
||
| #[test] | ||
| fn test_underscore() { | ||
| assert_eq!(to_snake_case("_hello"), "_hello"); | ||
| assert_eq!(to_snake_case("_"), "_"); | ||
| } | ||
|
|
||
| #[test] | ||
| fn test_to_snake_case() { | ||
| assert_eq!(to_snake_case("aString"), "a_string"); | ||
| assert_eq!(to_snake_case("MyString"), "my_string"); | ||
| assert_eq!(to_snake_case("my_string"), "my_string"); | ||
| assert_eq!(to_snake_case("_another_one"), "_another_one"); | ||
| assert_eq!(to_snake_case("RepeatedUPPERCASE"), "repeated_uppercase"); | ||
| assert_eq!(to_snake_case("UUID"), "uuid"); | ||
| } | ||
|
|
||
| #[test] | ||
| fn test_to_camel_case() { | ||
| assert_eq!(to_camel_case("aString"), "aString"); | ||
| assert_eq!(to_camel_case("MyString"), "myString"); | ||
| assert_eq!(to_camel_case("my_string"), "myString"); | ||
| assert_eq!(to_camel_case("_another_one"), "_anotherOne"); | ||
| assert_eq!(to_camel_case("RepeatedUPPERCASE"), "repeatedUppercase"); | ||
| assert_eq!(to_camel_case("UUID"), "uuid"); | ||
| assert_eq!(to_camel_case("__typename"), "__typename"); | ||
| } | ||
|
|
||
| #[test] | ||
| fn test_to_pascal_case() { | ||
| assert_eq!(to_pascal_case("aString"), "AString"); | ||
| assert_eq!(to_pascal_case("MyString"), "MyString"); | ||
| assert_eq!(to_pascal_case("my_string"), "MyString"); | ||
| assert_eq!(to_pascal_case("_another_one"), "_anotherOne"); | ||
| assert_eq!(to_pascal_case("RepeatedUPPERCASE"), "RepeatedUppercase"); | ||
| assert_eq!(to_pascal_case("UUID"), "Uuid"); | ||
| assert_eq!(to_pascal_case("CREATED_AT"), "CreatedAt"); | ||
| assert_eq!(to_pascal_case("__typename"), "__typename"); | ||
| } | ||
|
|
||
| #[test] | ||
| fn casings_are_not_lossy_where_possible() { | ||
| for s in ["snake_case_thing", "snake"] { | ||
| assert_eq!(to_snake_case(&to_pascal_case(s)), s); | ||
| } | ||
|
|
||
| for s in ["PascalCase", "Pascal"] { | ||
| assert_eq!(to_pascal_case(&to_snake_case(s)), s); | ||
| } | ||
|
|
||
| for s in ["camelCase", "camel"] { | ||
| assert_eq!(to_camel_case(&to_snake_case(s)), s); | ||
| } | ||
| } | ||
| } |
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