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use std::fmt::{Display, Error as FmtError, Formatter};
/// A value of a node.
#[derive(Debug, Clone, PartialEq, PartialOrd)]
pub enum Value {
/// Null.
Null,
/// Boolean.
Bool(bool),
/// Integral.
Int(i64),
/// Floating point.
Float(f64),
/// String.
Str(String),
/// Set of nodes.
Set(Vec<KeyValuePair>),
}
impl Display for Value {
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), FmtError> {
use Value as V;
match self {
V::Null => write!(f, "null"),
V::Bool(true) => write!(f, "true"),
V::Bool(false) => write!(f, "false"),
V::Int(x) => write!(f, "{}", x),
V::Float(x) => {
let s = format!("{}", x);
if s.contains('.') {
write!(f, "{}", s)
} else {
write!(f, "{}.0", s)
}
}
V::Str(x) => write!(f, "{}", php_str(x)),
V::Set(x) => {
write!(f, "[")?;
for kvp in x {
write!(f, "{},", kvp)?;
}
write!(f, "]")
}
}
}
}
enum PHPStringState {
Undecided,
UndecidedEscape,
Decided,
}
fn php_str(input: &str) -> String {
use PHPStringState as P;
let mut d = String::new();
let mut s = String::new();
let mut state = PHPStringState::Undecided;
d.reserve(input.len() + 2);
s.reserve(input.len() + 2);
d.push('"');
s.push('\'');
for c in input.chars() {
match state {
P::Undecided => match c {
'\0' => {
state = P::Decided;
d.push_str("\\000");
}
'\u{0007}' => {
state = P::Decided;
d.push_str("\\a");
}
'\u{001b}' => {
state = P::Decided;
d.push_str("\\e");
}
'\u{000c}' => {
state = P::Decided;
d.push_str("\\f");
}
'\r' => {
state = P::Decided;
d.push_str("\\r");
}
'\n' => {
state = P::Decided;
d.push_str("\\n");
}
'\t' => {
state = P::Decided;
d.push_str("\\t");
}
'\'' => {
s.push_str("\\'");
d.push('\'');
}
'\\' => {
state = P::UndecidedEscape;
d.push_str("\\\\");
}
'"' => {
s.push('"');
d.push_str("\\\"");
}
'$' => {
s.push('$');
d.push_str("\\$");
}
_ => {
s.push(c);
d.push(c);
}
},
P::UndecidedEscape => match c {
'\0' => {
state = P::Decided;
d.push_str("\\000");
}
'\u{0007}' => {
state = P::Decided;
d.push_str("\\a");
}
'\u{001b}' => {
state = P::Decided;
d.push_str("\\e");
}
'\u{000c}' => {
state = P::Decided;
d.push_str("\\f");
}
'\r' => {
state = P::Decided;
d.push_str("\\r");
}
'\n' => {
state = P::Decided;
d.push_str("\\n");
}
'\t' => {
state = P::Decided;
d.push_str("\\t");
}
'\'' => {
state = P::Undecided;
s.push_str("\\\\\\'");
d.push('\'');
}
'\\' => {
s.push_str("\\\\");
d.push_str("\\\\\\\\");
}
'"' => {
state = P::Undecided;
s.push_str("\\\"");
d.push_str("\\\"");
}
'$' => {
state = P::Undecided;
s.push_str("\\$");
d.push_str("\\$");
}
_ => {
state = P::Undecided;
s.push('\\');
s.push(c);
d.push(c);
}
},
P::Decided => match c {
'\0' => d.push_str("\\000"),
'\u{0007}' => d.push_str("\\a"),
'\u{001b}' => d.push_str("\\e"),
'\u{000c}' => d.push_str("\\f"),
'\r' => d.push_str("\\r"),
'\n' => d.push_str("\\n"),
'\t' => d.push_str("\\t"),
'\'' => d.push('\''),
'\\' => d.push_str("\\\\"),
'"' => d.push_str("\\\""),
'$' => d.push_str("\\$"),
_ => d.push(c),
},
}
}
match state {
P::Undecided => {
s.push('\'');
s
}
P::UndecidedEscape => {
s.push_str("\\\\'");
s
}
P::Decided => {
d.push('"');
d
}
}
}
impl Eq for Value {}
impl Ord for Value {
fn cmp(&self, other: &Self) -> std::cmp::Ordering {
self.partial_cmp(other).unwrap()
}
}
/// A graph node.
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
pub struct KeyValuePair {
/// The name of this node, if any.
pub key: Option<String>,
/// The value of this node.
pub value: Value,
}
impl KeyValuePair {
/// Creates a new key-value pair.
pub fn new(key: Option<String>, value: Value) -> Self {
Self { key, value }
}
/// Applies the key prefix, if any
pub fn key_prefix(&self) -> String {
if let Some(key) = &self.key {
let mut buf = String::new();
buf.push_str(&php_str(key));
buf.push_str(" => ");
buf
} else {
String::new()
}
}
}
impl Display for KeyValuePair {
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), FmtError> {
if let Some(key) = &self.key {
write!(f, "{} => {}", php_str(key), self.value)
} else {
self.value.fmt(f)
}
}
}