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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use std::borrow::Cow;
use std::str::FromStr;
/// The type of identifier to be renamed.
#[derive(Debug, Clone, Copy)]
pub enum IdentifierType<'a> {
StructMember,
EnumVariant { prefix: &'a str },
FunctionArg,
Type,
Enum,
}
impl<'a> IdentifierType<'a> {
fn to_str(self) -> &'static str {
match self {
IdentifierType::StructMember => "m",
IdentifierType::EnumVariant { .. } => "",
IdentifierType::FunctionArg => "a",
IdentifierType::Type => "",
IdentifierType::Enum => "",
}
}
}
/// A rule to apply to an identifier when generating bindings.
#[derive(Debug, Clone, Copy, Default)]
pub enum RenameRule {
/// Do not apply any renaming. The default.
#[default]
None,
/// Converts the identifier to PascalCase and adds a context dependent prefix
GeckoCase,
/// Converts the identifier to lower case.
LowerCase,
/// Converts the identifier to upper case.
UpperCase,
/// Converts the identifier to PascalCase.
PascalCase,
/// Converts the identifier to camelCase.
CamelCase,
/// Converts the identifier to snake_case.
SnakeCase,
/// Converts the identifier to SCREAMING_SNAKE_CASE.
ScreamingSnakeCase,
/// Converts the identifier to SCREAMING_SNAKE_CASE and prefixes enum variants
/// with the enum name.
QualifiedScreamingSnakeCase,
}
impl RenameRule {
pub(crate) fn not_none(self) -> Option<Self> {
match self {
RenameRule::None => None,
other => Some(other),
}
}
/// Applies the rename rule to a string
pub fn apply<'a>(self, text: &'a str, context: IdentifierType) -> Cow<'a, str> {
use heck::*;
if text.is_empty() {
return Cow::Borrowed(text);
}
Cow::Owned(match self {
RenameRule::None => return Cow::Borrowed(text),
RenameRule::GeckoCase => context.to_str().to_owned() + &text.to_upper_camel_case(),
RenameRule::LowerCase => text.to_lowercase(),
RenameRule::UpperCase => text.to_uppercase(),
RenameRule::PascalCase => text.to_pascal_case(),
RenameRule::CamelCase => text.to_lower_camel_case(),
RenameRule::SnakeCase => text.to_snake_case(),
RenameRule::ScreamingSnakeCase => text.to_shouty_snake_case(),
RenameRule::QualifiedScreamingSnakeCase => {
let mut result = String::new();
if let IdentifierType::EnumVariant { prefix } = context {
result.push_str(
&RenameRule::ScreamingSnakeCase.apply(prefix, IdentifierType::Enum),
);
result.push('_');
}
result.push_str(&RenameRule::ScreamingSnakeCase.apply(text, context));
result
}
})
}
}
impl FromStr for RenameRule {
type Err = String;
fn from_str(s: &str) -> Result<RenameRule, Self::Err> {
match s {
"none" => Ok(RenameRule::None),
"None" => Ok(RenameRule::None),
"mGeckoCase" => Ok(RenameRule::GeckoCase),
"GeckoCase" => Ok(RenameRule::GeckoCase),
"gecko_case" => Ok(RenameRule::GeckoCase),
"lowercase" => Ok(RenameRule::LowerCase),
"LowerCase" => Ok(RenameRule::LowerCase),
"lower_case" => Ok(RenameRule::LowerCase),
"UPPERCASE" => Ok(RenameRule::UpperCase),
"UpperCase" => Ok(RenameRule::UpperCase),
"upper_case" => Ok(RenameRule::UpperCase),
"PascalCase" => Ok(RenameRule::PascalCase),
"pascal_case" => Ok(RenameRule::PascalCase),
"camelCase" => Ok(RenameRule::CamelCase),
"CamelCase" => Ok(RenameRule::CamelCase),
"camel_case" => Ok(RenameRule::CamelCase),
"snake_case" => Ok(RenameRule::SnakeCase),
"SnakeCase" => Ok(RenameRule::SnakeCase),
"SCREAMING_SNAKE_CASE" => Ok(RenameRule::ScreamingSnakeCase),
"ScreamingSnakeCase" => Ok(RenameRule::ScreamingSnakeCase),
"screaming_snake_case" => Ok(RenameRule::ScreamingSnakeCase),
"QUALIFIED_SCREAMING_SNAKE_CASE" => Ok(RenameRule::QualifiedScreamingSnakeCase),
"QualifiedScreamingSnakeCase" => Ok(RenameRule::QualifiedScreamingSnakeCase),
"qualified_screaming_snake_case" => Ok(RenameRule::QualifiedScreamingSnakeCase),
_ => Err(format!("Unrecognized RenameRule: '{}'.", s)),
}
}
}
deserialize_enum_str!(RenameRule);
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