src/main/java/org/zwobble/hobgoblin/compiler/util/Casing.java


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package org.zwobble.hobgoblin.compiler.util;

import java.util.Locale;

public class Casing {
    private Casing() {}

    public static String lowerCamelCaseToUpperCamelCase(String name) {
        return name.substring(0, 1).toUpperCase(Locale.ROOT) + name.substring(1);
    }

    public static String upperCamelCaseToLowerCamelCase(String name) {
        return name.substring(0, 1).toLowerCase(Locale.ROOT) + name.substring(1);
    }

    public static String lowerCamelCaseToUpperCase(String lowerCamelCase) {
        var upperCase = new StringBuilder();

        for (var characterIndex = 0; characterIndex < lowerCamelCase.length(); characterIndex++) {
            var character = lowerCamelCase.charAt(characterIndex);
            if (Character.isUpperCase(character) || (Character.isDigit(character) && !Character.isDigit(lowerCamelCase.charAt(characterIndex - 1)))) {
                upperCase.append('_');
                upperCase.append(character);
            } else {
                upperCase.append(Character.toUpperCase(character));
            }
        }

        return upperCase.toString();
    }

    public static String lowerCamelCaseToSnakeCase(String lowerCamelCase) {
        var snakeCase = new StringBuilder();

        for (var characterIndex = 0; characterIndex < lowerCamelCase.length(); characterIndex++) {
            var character = lowerCamelCase.charAt(characterIndex);
            if (Character.isUpperCase(character) || (Character.isDigit(character) && !Character.isDigit(lowerCamelCase.charAt(characterIndex - 1)))) {
                snakeCase.append('_');
            }
            snakeCase.append(Character.toLowerCase(character));
        }

        return snakeCase.toString();
    }

    public static String upperCamelCaseToSnakeCase(String lowerCamelCase) {
        var snakeCase = new StringBuilder();

        for (var characterIndex = 0; characterIndex < lowerCamelCase.length(); characterIndex++) {
            var character = lowerCamelCase.charAt(characterIndex);
            if (characterIndex != 0 && Character.isUpperCase(character) || (Character.isDigit(character) && !Character.isDigit(lowerCamelCase.charAt(characterIndex - 1)))) {
                snakeCase.append('_');
            }
            snakeCase.append(Character.toLowerCase(character));
        }

        return snakeCase.toString();
    }
}