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//! Trait implementations for VDF types.
use alloc::borrow::Cow;
use alloc::string::String;
use super::types::{Key, Obj, Value, Vdf};
use core::fmt;
use core::fmt::Write as _;
use core::ops::Index;
// ============================================================================
// Pretty-print helper functions
// ============================================================================
/// Write a quoted and escaped string to the formatter.
///
/// Escapes special characters: `\n`, `\t`, `\r`, `\\`, `"`
fn write_quoted_str(f: &mut fmt::Formatter<'_>, s: &str) -> fmt::Result {
f.write_char('"')?;
for c in s.chars() {
match c {
'\n' => f.write_str("\\n")?,
'\t' => f.write_str("\\t")?,
'\r' => f.write_str("\\r")?,
'\\' => f.write_str("\\\\")?,
'"' => f.write_str("\\\"")?,
c => f.write_char(c)?,
}
}
f.write_char('"')
}
/// Write indentation (tabs) to the formatter.
fn write_indent(f: &mut fmt::Formatter<'_>, level: usize) -> fmt::Result {
for _ in 0..level {
f.write_char('\t')?;
}
Ok(())
}
/// Helper struct for pretty-printing an Obj with a specific indent level.
struct PrettyObj<'a, 'text> {
obj: &'a Obj<'text>,
indent: usize,
}
impl fmt::Display for PrettyObj<'_, '_> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
writeln!(f, "{{")?;
for (key, value) in self.obj.inner.iter() {
write_indent(f, self.indent + 1)?;
write_quoted_str(f, key)?;
if let Value::Obj(inner_obj) = value {
// Object value: key on one line, value (with braces) on next lines
writeln!(f)?;
write_indent(f, self.indent + 1)?;
write!(
f,
"{}",
PrettyObj {
obj: inner_obj,
indent: self.indent + 1
}
)?;
writeln!(f)?;
} else {
// Scalar value: key<tab>value on same line
write!(f, "\t")?;
write!(f, "{:#}", value)?;
writeln!(f)?;
}
}
write_indent(f, self.indent)?;
write!(f, "}}")
}
}
// ============================================================================
// From implementations for Value
// ============================================================================
impl<'text> From<&'text str> for Value<'text> {
fn from(s: &'text str) -> Self {
Value::Str(Cow::Borrowed(s))
}
}
impl From<String> for Value<'static> {
fn from(s: String) -> Self {
Value::Str(Cow::Owned(s))
}
}
impl From<i32> for Value<'static> {
fn from(n: i32) -> Self {
Value::I32(n)
}
}
impl From<u64> for Value<'static> {
fn from(n: u64) -> Self {
Value::U64(n)
}
}
impl From<f32> for Value<'static> {
fn from(n: f32) -> Self {
Value::Float(n)
}
}
impl From<u32> for Value<'static> {
fn from(n: u32) -> Self {
Value::Pointer(n)
}
}
impl From<[u8; 4]> for Value<'static> {
fn from(color: [u8; 4]) -> Self {
Value::Color(color)
}
}
impl<'text> From<Obj<'text>> for Value<'text> {
fn from(obj: Obj<'text>) -> Self {
Value::Obj(obj)
}
}
impl<'text> fmt::Display for Value<'text> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Value::Str(s) => write_quoted_str(f, s),
Value::Obj(obj) => write!(f, "{}", obj),
Value::I32(n) => write!(f, "\"{}\"", n),
Value::U64(n) => write!(f, "\"{}\"", n),
Value::Float(n) => write!(f, "\"{}\"", n),
Value::Pointer(n) => write!(f, "\"0x{:08x}\"", n),
Value::Color(c) => write!(f, "\"{} {} {} {}\"", c[0], c[1], c[2], c[3]),
}
}
}
impl<'text> Default for Obj<'text> {
fn default() -> Self {
Self::new()
}
}
impl<'text> fmt::Display for Obj<'text> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(
f,
"{}",
PrettyObj {
obj: self,
indent: 0
}
)
}
}
impl<'text> fmt::Display for Vdf<'text> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write_quoted_str(f, self.key())?;
writeln!(f)?;
write!(f, "{}", self.value())
}
}
// ============================================================================
// IntoIterator implementations for Obj
// ============================================================================
impl<'text> IntoIterator for Obj<'text> {
type Item = (Key<'text>, Value<'text>);
type IntoIter = indexmap::map::IntoIter<Key<'text>, Value<'text>>;
fn into_iter(self) -> Self::IntoIter {
self.inner.into_iter()
}
}
impl<'a, 'text> IntoIterator for &'a Obj<'text> {
type Item = (&'a Key<'text>, &'a Value<'text>);
type IntoIter = indexmap::map::Iter<'a, Key<'text>, Value<'text>>;
fn into_iter(self) -> Self::IntoIter {
self.inner.iter()
}
}
// ============================================================================
// Index implementations for Value and Obj
// ============================================================================
impl<'text> Index<&str> for Value<'text> {
type Output = Value<'text>;
/// Returns a reference to the value at the given key.
///
/// # Panics
///
/// Panics if this is not an object or if the key doesn't exist.
/// Use `get()` for non-panicking access.
fn index(&self, key: &str) -> &Self::Output {
self.get(key).expect("key not found in Value")
}
}
impl<'text> Index<&str> for Obj<'text> {
type Output = Value<'text>;
/// Returns a reference to the value at the given key.
///
/// # Panics
///
/// Panics if the key doesn't exist. Use `get()` for non-panicking access.
fn index(&self, key: &str) -> &Self::Output {
self.get(key).expect("key not found in Obj")
}
}
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