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use crate::{Environment, Expression, RuntimeError, with_cfm_config};
use std::{borrow::Cow, path::PathBuf};
// Helper functions
#[inline]
pub fn expand_home(path: &'_ str) -> Cow<'_, str> {
if path.starts_with("~")
&& let Some(home_dir) = dirs::home_dir()
{
return Cow::Owned(path.replace("~", home_dir.to_string_lossy().as_ref()));
}
Cow::Borrowed(path)
}
#[inline]
pub fn get_std_cwd() -> PathBuf {
std::env::current_dir().unwrap_or_else(|_| PathBuf::from("."))
}
#[inline]
pub fn get_current_path(env: &mut Environment) -> PathBuf {
// for compaty of hot key binding, cwd was changed in another env
// use slash cmd insteadof key binding
// get_std_cwd()
env.get("PWD").map_or(get_std_cwd(), |v| match v {
Expression::String(s) => PathBuf::from(s),
s => PathBuf::from(s.to_string()),
})
}
#[inline]
pub fn get_current_path_string(env: &mut Environment) -> String {
env.get("PWD").map_or(
std::env::current_dir()
.map(|p| p.to_string_lossy().into_owned())
.unwrap_or_default(),
|v| match v {
Expression::String(s) => s,
s => s.to_string(),
},
)
}
#[inline]
pub fn join_current_path(path: &str, env: &mut Environment) -> PathBuf {
get_current_path(env).join(path)
}
#[inline]
pub fn abs(path: &str, env: &mut Environment) -> PathBuf {
if path.starts_with("~") {
return PathBuf::from(expand_home(path).as_ref());
}
join_current_path(path, env)
}
pub fn abs_script(path: &str, env: &mut Environment) -> PathBuf {
if path.starts_with("~") {
return PathBuf::from(expand_home(path).as_ref());
}
let base = match env.get("SCRIPT") {
Some(Expression::String(s)) => match PathBuf::from(s).parent() {
None => get_current_path(env),
Some(p) if p.to_string_lossy() == "" => get_current_path(env),
Some(p) => p.to_path_buf(),
},
_ => get_current_path(env),
};
base.join(path)
}
pub fn abs_check(path: &str, env: &mut Environment) -> Result<PathBuf, RuntimeError> {
let abs = abs(path, env);
if abs.exists() {
return Ok(abs);
}
Err(RuntimeError::common(
"Entry not found".into(),
Expression::String(path.to_string()),
0,
))
}
#[inline]
pub fn canon(p: &str, env: &mut Environment) -> Result<PathBuf, RuntimeError> {
let path = abs(p, env);
dunce::canonicalize(&path).map_err(|e| {
RuntimeError::from_io_error(e, "canon".into(), Expression::String(p.to_string()), 0)
})
}
/// 自定义转义处理器，替换 snailquote::unescape
/// 输入为去掉外层引号后的裸字符串内容
/// 对于无法识别的转义序列，保留 \X 原样（宽容模式）
pub fn unescape_str(s: &str, skip_quote: bool) -> String {
let mut result = String::with_capacity(s.len());
let mut chars = s.chars().peekable();
while let Some(c) = chars.next() {
if c != '\\' {
result.push(c);
continue;
}
let nextc = chars.next();
if skip_quote {
match nextc {
None => {
// 末尾孤立的反斜杠，保留
result.push('\\');
break;
}
Some(next) => {
if matches!(next, '\'' | '"' | '`' | '\\') {
result.push('\\');
result.push(next);
continue;
}
}
}
}
match nextc {
None => {
// 末尾孤立的反斜杠，保留
result.push('\\');
}
Some(next) => match next {
// 标准转义
'n' => result.push('\n'),
'r' => result.push('\r'),
't' => result.push('\t'),
'0' => result.push('\0'),
'a' => result.push('\x07'), // 响铃
'b' => result.push('\x08'), // 退格
'f' => result.push('\x0c'), // 换页
'v' => result.push('\x0b'), // 垂直制表符
'e' | 'E' => result.push('\x1b'), // ESC（统一处理，不再需要预处理）
'\\' => result.push('\\'),
'"' => result.push('"'),
'\'' => result.push('\''),
'`' => result.push('`'),
// \xNN 十六进制字节
'x' => {
let hex: String = chars.by_ref().take(2).collect();
if hex.len() == 2 {
if let Ok(n) = u8::from_str_radix(&hex, 16) {
// 作为 Unicode 标量值处理，支持 ASCII 范围
result.push(n as char);
} else {
result.push('\\');
result.push('x');
result.push_str(&hex);
}
} else {
result.push('\\');
result.push('x');
result.push_str(&hex);
}
}
// \033 \007 等八进制（3位）
'0'..='7' => {
let mut oct = String::with_capacity(3);
oct.push(next);
for _ in 0..2 {
if matches!(chars.peek(), Some('0'..='7')) {
oct.push(chars.next().unwrap());
} else {
break;
}
}
if let Ok(n) = u32::from_str_radix(&oct, 8) {
if let Some(ch) = char::from_u32(n) {
result.push(ch);
} else {
result.push('\\');
result.push_str(&oct);
}
} else {
result.push('\\');
result.push_str(&oct);
}
}
// \u{NNNN} 或 \uNNNN（4位）
'u' => {
if chars.peek() == Some(&'{') {
chars.next(); // consume '{'
let hex: String = chars.by_ref().take_while(|&c| c != '}').collect();
match u32::from_str_radix(&hex, 16).ok().and_then(char::from_u32) {
Some(ch) => result.push(ch),
None => {
result.push_str("\\u{");
result.push_str(&hex);
result.push('}');
}
}
} else {
let hex: String = chars.by_ref().take(4).collect();
match u32::from_str_radix(&hex, 16).ok().and_then(char::from_u32) {
Some(ch) => result.push(ch),
None => {
result.push_str("\\u");
result.push_str(&hex);
}
}
}
}
// \UNNNNNNNN（8位 Unicode）
'U' => {
let hex: String = chars.by_ref().take(8).collect();
match u32::from_str_radix(&hex, 16).ok().and_then(char::from_u32) {
Some(ch) => result.push(ch),
None => {
result.push_str("\\U");
result.push_str(&hex);
}
}
}
// 无法识别的转义序列：保留原始 \X
other => {
result.push('\\');
result.push(other);
}
},
}
}
result
}
/// 字节字面量专用转义处理器：输出 Vec<u8> 而非 String
/// \xNN 表示原始字节值（可以是任意 0x00-0xFF，不做 UTF-8 编码）
/// 其它转义（\n \t \uXXXX 等）按其对应字符的 UTF-8 编码写入
pub fn unescape_bytes(s: &str) -> Vec<u8> {
let mut result: Vec<u8> = Vec::with_capacity(s.len());
let mut chars = s.chars().peekable();
while let Some(c) = chars.next() {
if c != '\\' {
let mut buf = [0u8; 4];
result.extend_from_slice(c.encode_utf8(&mut buf).as_bytes());
continue;
}
match chars.next() {
None => result.push(b'\\'),
Some(next) => match next {
'n' => result.push(b'\n'),
'r' => result.push(b'\r'),
't' => result.push(b'\t'),
'0' => result.push(0),
'a' => result.push(0x07),
'b' => result.push(0x08),
'f' => result.push(0x0c),
'v' => result.push(0x0b),
'e' | 'E' => result.push(0x1b),
'\\' => result.push(b'\\'),
'"' => result.push(b'"'),
'\'' => result.push(b'\''),
'`' => result.push(b'`'),
// \xNN -> 原始字节，不经过 UTF-8 编码
'x' => {
let hex: String = chars.by_ref().take(2).collect();
match u8::from_str_radix(&hex, 16) {
Ok(n) => result.push(n),
Err(_) => {
result.push(b'\\');
result.push(b'x');
result.extend_from_slice(hex.as_bytes());
}
}
}
// \033 八进制（3位）——同样直接作为字节值，而非 char::from_u32
'0'..='7' => {
let mut oct = String::with_capacity(3);
oct.push(next);
for _ in 0..2 {
if matches!(chars.peek(), Some('0'..='7')) {
oct.push(chars.next().unwrap());
} else {
break;
}
}
match u32::from_str_radix(&oct, 8) {
Ok(n) if n <= 0xFF => result.push(n as u8),
_ => {
result.push(b'\\');
result.extend_from_slice(oct.as_bytes());
}
}
}
// \u{...} / \uXXXX / \UXXXXXXXX 表示 Unicode 字符，仍按 UTF-8 编码写入字节流
'u' => {
let hex: String = if chars.peek() == Some(&'{') {
chars.next();
chars.by_ref().take_while(|&c| c != '}').collect()
} else {
chars.by_ref().take(4).collect()
};
match u32::from_str_radix(&hex, 16).ok().and_then(char::from_u32) {
Some(ch) => {
let mut buf = [0u8; 4];
result.extend_from_slice(ch.encode_utf8(&mut buf).as_bytes());
}
None => {
result.push(b'\\');
result.push(b'u');
result.extend_from_slice(hex.as_bytes());
}
}
}
'U' => {
let hex: String = chars.by_ref().take(8).collect();
match u32::from_str_radix(&hex, 16).ok().and_then(char::from_u32) {
Some(ch) => {
let mut buf = [0u8; 4];
result.extend_from_slice(ch.encode_utf8(&mut buf).as_bytes());
}
None => {
result.push(b'\\');
result.push(b'U');
result.extend_from_slice(hex.as_bytes());
}
}
}
other => {
result.push(b'\\');
let mut buf = [0u8; 4];
result.extend_from_slice(other.encode_utf8(&mut buf).as_bytes());
}
},
}
}
result
}
/// CFM: Command First Mode — shell-style parsing for single-line commands.
#[inline]
pub fn is_cfm_mode(input: &str) -> bool {
with_cfm_config(|cfm_config| {
if input.starts_with(">") {
true
} else if input.starts_with(":") {
false
} else {
match cfm_config {
Some(c) => c,
_ => !input.contains('\n') && !input.starts_with("let "),
}
}
})
}