1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138

/* 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::str::FromStr;

use crate::bindgen::ir::{Enum, Item};

/// The type of identifier to be renamed.
#[derive(Debug, Clone, Copy)]
pub enum IdentifierType<'a> {
    StructMember,
    EnumVariant(&'a Enum),
    FunctionArg,
    Enum,
}

impl<'a> IdentifierType<'a> {
    fn to_str(&'a self) -> &'static str {
        match *self {
            IdentifierType::StructMember => "m",
            IdentifierType::EnumVariant(..) => "",
            IdentifierType::FunctionArg => "a",
            IdentifierType::Enum => "",
        }
    }
}

/// A rule to apply to an identifier when generating bindings.
#[derive(Debug, Clone, Copy)]
pub enum RenameRule {
    /// Do not apply any renaming. The 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 {
    /// Applies the rename rule to a string
    pub fn apply(self, text: &str, context: IdentifierType) -> String {
        use heck::*;

        if text.is_empty() {
            return String::new();
        }

        match self {
            RenameRule::None => text.to_owned(),
            RenameRule::GeckoCase => context.to_str().to_owned() + &text.to_camel_case(),
            RenameRule::LowerCase => text.to_lowercase(),
            RenameRule::UpperCase => text.to_uppercase(),
            RenameRule::PascalCase => text.to_camel_case(),
            RenameRule::CamelCase => text.to_mixed_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(e) = context {
                    result.push_str(
                        &RenameRule::ScreamingSnakeCase
                            .apply(e.path().name(), IdentifierType::Enum),
                    );
                    result.push_str("_");
                }

                result.push_str(&RenameRule::ScreamingSnakeCase.apply(&text, context));
                result
            }
        }
    }
}

impl Default for RenameRule {
    fn default() -> RenameRule {
        RenameRule::None
    }
}

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);