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|
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()
}};
}
|
