First

1 files changed, 382 insertions, 0 deletions

diff --git a/src/fmt_case_style.rs b/src/fmt_case_style.rs
new file mode 100644
index 0000000..076bdd3
--- /dev/null
+++ b/src/fmt_case_style.rs
@@ -0,0 +1,382 @@
+pub struct CaseFormatter {
+    content: Vec<String>,
+}
+
+impl From<String> for CaseFormatter {
+    fn from(value: String) -> Self {
+        Self {
+            content: str_split(value),
+        }
+    }
+}
+
+impl From<&String> for CaseFormatter {
+    fn from(value: &String) -> Self {
+        Self {
+            content: str_split(value.clone()),
+        }
+    }
+}
+
+impl From<&str> for CaseFormatter {
+    fn from(value: &str) -> Self {
+        Self {
+            content: str_split(value.to_string()),
+        }
+    }
+}
+
+/// Split the string into segments for conversion
+fn str_split(input: String) -> Vec<String> {
+    let mut result = String::new();
+    let mut prev_space = false;
+
+    for c in input.chars() {
+        match c {
+            'a'..='z' | 'A'..='Z' | '0'..='9' => {
+                result.push(c);
+                prev_space = false;
+            }
+            '_' | ',' | '.' | '-' | ' ' => {
+                if !prev_space {
+                    result.push(' ');
+                    prev_space = true;
+                }
+            }
+            _ => {}
+        }
+    }
+
+    let mut processed = String::new();
+    let mut chars = result.chars().peekable();
+
+    while let Some(c) = chars.next() {
+        processed.push(c);
+
+        // Detect case boundaries:
+        // when the current character is lowercase and the next is uppercase (e.g., "bre[wC]offee")
+        // Treat as a word boundary in PascalCase or camelCase, insert a space
+        if let Some(&next) = chars.peek()
+            && c.is_lowercase()
+            && next.is_uppercase()
+        {
+            processed.push(' ');
+        }
+    }
+
+    processed
+        .to_lowercase()
+        .split_whitespace()
+        .map(|s| s.to_string())
+        .collect()
+}
+
+impl CaseFormatter {
+    /// Convert to camelCase format (brewCoffee)
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # use just_fmt::fmt_case_style::CaseFormatter;
+    /// let processor = CaseFormatter::from("brew_coffee");
+    /// assert_eq!(processor.to_camel_case(), "brewCoffee");
+    /// ```
+    pub fn to_camel_case(&self) -> String {
+        let mut result = String::new();
+        for (i, word) in self.content.iter().enumerate() {
+            if i == 0 {
+                result.push_str(&word.to_lowercase());
+            } else {
+                let mut chars = word.chars();
+                if let Some(first) = chars.next() {
+                    result.push_str(&first.to_uppercase().collect::<String>());
+                    result.push_str(&chars.collect::<String>().to_lowercase());
+                }
+            }
+        }
+        result
+    }
+
+    /// Convert to PascalCase format (BrewCoffee)
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # use just_fmt::fmt_case_style::CaseFormatter;
+    /// let processor = CaseFormatter::from("brew_coffee");
+    /// assert_eq!(processor.to_pascal_case(), "BrewCoffee");
+    /// ```
+    pub fn to_pascal_case(&self) -> String {
+        let mut result = String::new();
+        for word in &self.content {
+            let mut chars = word.chars();
+            if let Some(first) = chars.next() {
+                result.push_str(&first.to_uppercase().collect::<String>());
+                result.push_str(&chars.collect::<String>().to_lowercase());
+            }
+        }
+        result
+    }
+
+    /// Convert to kebab-case format (brew-coffee)
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # use just_fmt::fmt_case_style::CaseFormatter;
+    /// let processor = CaseFormatter::from("brew_coffee");
+    /// assert_eq!(processor.to_kebab_case(), "brew-coffee");
+    /// ```
+    pub fn to_kebab_case(&self) -> String {
+        self.content.join("-").to_lowercase()
+    }
+
+    /// Convert to snake_case format (brew_coffee)
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # use just_fmt::fmt_case_style::CaseFormatter;
+    /// let processor = CaseFormatter::from("brewCoffee");
+    /// assert_eq!(processor.to_snake_case(), "brew_coffee");
+    /// ```
+    pub fn to_snake_case(&self) -> String {
+        self.content.join("_").to_lowercase()
+    }
+
+    /// Convert to dot.case format (brew.coffee)
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # use just_fmt::fmt_case_style::CaseFormatter;
+    /// let processor = CaseFormatter::from("brew_coffee");
+    /// assert_eq!(processor.to_dot_case(), "brew.coffee");
+    /// ```
+    pub fn to_dot_case(&self) -> String {
+        self.content.join(".").to_lowercase()
+    }
+
+    /// Convert to Title Case format (Brew Coffee)
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # use just_fmt::fmt_case_style::CaseFormatter;
+    /// let processor = CaseFormatter::from("brew_coffee");
+    /// assert_eq!(processor.to_title_case(), "Brew Coffee");
+    /// ```
+    pub fn to_title_case(&self) -> String {
+        let mut result = String::new();
+        for word in &self.content {
+            let mut chars = word.chars();
+            if let Some(first) = chars.next() {
+                result.push_str(&first.to_uppercase().collect::<String>());
+                result.push_str(&chars.collect::<String>().to_lowercase());
+            }
+            result.push(' ');
+        }
+        result.pop();
+        result
+    }
+
+    /// Convert to lower case format (brew coffee)
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # use just_fmt::fmt_case_style::CaseFormatter;
+    /// let processor = CaseFormatter::from("BREW COFFEE");
+    /// assert_eq!(processor.to_lower_case(), "brew coffee");
+    /// ```
+    pub fn to_lower_case(&self) -> String {
+        self.content.join(" ").to_lowercase()
+    }
+
+    /// Convert to UPPER CASE format (BREW COFFEE)
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// # use just_fmt::fmt_case_style::CaseFormatter;
+    /// let processor = CaseFormatter::from("brew coffee");
+    /// assert_eq!(processor.to_upper_case(), "BREW COFFEE");
+    /// ```
+    pub fn to_upper_case(&self) -> String {
+        self.content.join(" ").to_uppercase()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::fmt_case_style::CaseFormatter;
+
+    #[test]
+    fn test_processer() {
+        let test_cases = vec![
+            ("brew_coffee", "brewCoffee"),
+            ("brew, coffee", "brewCoffee"),
+            ("brew-coffee", "brewCoffee"),
+            ("Brew.Coffee", "brewCoffee"),
+            ("bRewCofFee", "bRewCofFee"),
+            ("brewCoffee", "brewCoffee"),
+            ("b&rewCoffee", "brewCoffee"),
+            ("BrewCoffee", "brewCoffee"),
+            ("brew.coffee", "brewCoffee"),
+            ("Brew_Coffee", "brewCoffee"),
+            ("BREW COFFEE", "brewCoffee"),
+        ];
+
+        for (input, expected) in test_cases {
+            let processor = CaseFormatter::from(input);
+            assert_eq!(
+                processor.to_camel_case(),
+                expected,
+                "Failed for input: '{}'",
+                input
+            );
+        }
+    }
+
+    #[test]
+    fn test_conversions() {
+        let processor = CaseFormatter::from("brewCoffee");
+
+        assert_eq!(processor.to_upper_case(), "BREW COFFEE");
+        assert_eq!(processor.to_lower_case(), "brew coffee");
+        assert_eq!(processor.to_title_case(), "Brew Coffee");
+        assert_eq!(processor.to_dot_case(), "brew.coffee");
+        assert_eq!(processor.to_snake_case(), "brew_coffee");
+        assert_eq!(processor.to_kebab_case(), "brew-coffee");
+        assert_eq!(processor.to_pascal_case(), "BrewCoffee");
+        assert_eq!(processor.to_camel_case(), "brewCoffee");
+    }
+}
+
+/// Convert to camelCase format (brewCoffee)
+///
+/// # Examples
+///
+/// ```
+/// # use just_fmt::camel_case;
+/// assert_eq!(camel_case!("brew_coffee"), "brewCoffee");
+/// ```
+#[macro_export]
+macro_rules! camel_case {
+    ($input:expr) => {{
+        use just_fmt::fmt_case_style::CaseFormatter;
+        CaseFormatter::from($input).to_camel_case()
+    }};
+}
+
+/// Convert to UPPER CASE format (BREW COFFEE)
+///
+/// # Examples
+///
+/// ```
+/// # use just_fmt::upper_case;
+/// assert_eq!(upper_case!("brew coffee"), "BREW COFFEE");
+/// ```
+#[macro_export]
+macro_rules! upper_case {
+    ($input:expr) => {{
+        use just_fmt::fmt_case_style::CaseFormatter;
+        CaseFormatter::from($input).to_upper_case()
+    }};
+}
+
+/// Convert to lower case format (brew coffee)
+///
+/// # Examples
+///
+/// ```
+/// # use just_fmt::lower_case;
+/// assert_eq!(lower_case!("BREW COFFEE"), "brew coffee");
+/// ```
+#[macro_export]
+macro_rules! lower_case {
+    ($input:expr) => {{
+        use just_fmt::fmt_case_style::CaseFormatter;
+        CaseFormatter::from($input).to_lower_case()
+    }};
+}
+
+/// Convert to Title Case format (Brew Coffee)
+///
+/// # Examples
+///
+/// ```
+/// # use just_fmt::title_case;
+/// assert_eq!(title_case!("brew_coffee"), "Brew Coffee");
+/// ```
+#[macro_export]
+macro_rules! title_case {
+    ($input:expr) => {{
+        use just_fmt::fmt_case_style::CaseFormatter;
+        CaseFormatter::from($input).to_title_case()
+    }};
+}
+
+/// Convert to dot.case format (brew.coffee)
+///
+/// # Examples
+///
+/// ```
+/// # use just_fmt::dot_case;
+/// assert_eq!(dot_case!("brew_coffee"), "brew.coffee");
+/// ```
+#[macro_export]
+macro_rules! dot_case {
+    ($input:expr) => {{
+        use just_fmt::fmt_case_style::CaseFormatter;
+        CaseFormatter::from($input).to_dot_case()
+    }};
+}
+
+/// Convert to snake_case format (brew_coffee)
+///
+/// # Examples
+///
+/// ```
+/// # use just_fmt::snake_case;
+/// assert_eq!(snake_case!("brewCoffee"), "brew_coffee");
+/// ```
+#[macro_export]
+macro_rules! snake_case {
+    ($input:expr) => {{
+        use just_fmt::fmt_case_style::CaseFormatter;
+        CaseFormatter::from($input).to_snake_case()
+    }};
+}
+
+/// Convert to kebab-case format (brew-coffee)
+///
+/// # Examples
+///
+/// ```
+/// # use just_fmt::kebab_case;
+/// assert_eq!(kebab_case!("brew_coffee"), "brew-coffee");
+/// ```
+#[macro_export]
+macro_rules! kebab_case {
+    ($input:expr) => {{
+        use just_fmt::fmt_case_style::CaseFormatter;
+        CaseFormatter::from($input).to_kebab_case()
+    }};
+}
+
+/// Convert to PascalCase format (BrewCoffee)
+///
+/// # Examples
+///
+/// ```
+/// # use just_fmt::pascal_case;
+/// assert_eq!(pascal_case!("brew_coffee"), "BrewCoffee");
+/// ```
+#[macro_export]
+macro_rules! pascal_case {
+    ($input:expr) => {{
+        use just_fmt::fmt_case_style::CaseFormatter;
+        CaseFormatter::from($input).to_pascal_case()
+    }};
+}