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use std::fmt::{self, Display, Formatter};
use crate::error::Errors;
use crate::size::Size;
use super::func::{keys::Key, values::Value};
use super::span::{Span, Spanned};
use super::tokens::is_identifier;
/// An argument or return value.
#[derive(Clone, PartialEq)]
pub enum Expr {
Ident(Ident),
Str(String),
Number(f64),
Size(Size),
Bool(bool),
Tuple(Tuple),
Object(Object),
}
impl Expr {
pub fn name(&self) -> &'static str {
use Expr::*;
match self {
Ident(_) => "identifier",
Str(_) => "string",
Number(_) => "number",
Size(_) => "size",
Bool(_) => "bool",
Tuple(_) => "tuple",
Object(_) => "object",
}
}
}
/// An identifier.
#[derive(Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub struct Ident(pub String);
impl Ident {
pub fn new<S>(ident: S) -> Option<Ident> where S: AsRef<str> + Into<String> {
if is_identifier(ident.as_ref()) {
Some(Ident(ident.into()))
} else {
None
}
}
pub fn as_str(&self) -> &str {
self.0.as_str()
}
}
/// A sequence of expressions.
#[derive(Clone, PartialEq)]
pub struct Tuple {
pub items: Vec<Spanned<Expr>>,
}
impl Tuple {
pub fn new() -> Tuple {
Tuple { items: vec![] }
}
pub fn add(&mut self, item: Spanned<Expr>) {
self.items.push(item);
}
pub fn get<V: Value>(&mut self, errors: &mut Errors) -> Option<V::Output> {
while !self.items.is_empty() {
let expr = self.items.remove(0);
let span = expr.span;
match V::parse(expr) {
Ok(output) => return Some(output),
Err(err) => errors.push(Spanned { v: err, span }),
}
}
None
}
pub fn get_all<'a, V: Value>(&'a mut self, errors: &'a mut Errors)
-> impl Iterator<Item=V::Output> + 'a {
self.items.drain(..).filter_map(move |expr| {
let span = expr.span;
match V::parse(expr) {
Ok(output) => Some(output),
Err(err) => { errors.push(Spanned { v: err, span }); None }
}
})
}
}
/// A key-value collection of identifiers and associated expressions.
#[derive(Clone, PartialEq)]
pub struct Object {
pub pairs: Vec<Pair>,
}
/// A key-value pair in an object.
#[derive(Clone, PartialEq)]
pub struct Pair {
pub key: Spanned<Ident>,
pub value: Spanned<Expr>,
}
impl Object {
pub fn new() -> Object {
Object { pairs: vec![] }
}
pub fn add(&mut self, key: Spanned<Ident>, value: Spanned<Expr>) {
self.pairs.push(Pair { key, value });
}
pub fn add_pair(&mut self, pair: Pair) {
self.pairs.push(pair);
}
pub fn get<V: Value>(&mut self, errors: &mut Errors, key: &str) -> Option<V::Output> {
let index = self.pairs.iter().position(|pair| pair.key.v.as_str() == key)?;
self.get_index::<V>(errors, index)
}
pub fn get_with_key<K: Key, V: Value>(
&mut self,
errors: &mut Errors,
) -> Option<(K::Output, V::Output)> {
for (index, pair) in self.pairs.iter().enumerate() {
let key = Spanned { v: pair.key.v.as_str(), span: pair.key.span };
if let Some(key) = K::parse(key) {
return self.get_index::<V>(errors, index).map(|value| (key, value));
}
}
None
}
pub fn get_all<'a, K: Key, V: Value>(
&'a mut self,
errors: &'a mut Errors,
) -> impl Iterator<Item=(K::Output, V::Output)> + 'a {
let mut index = 0;
std::iter::from_fn(move || {
if index < self.pairs.len() {
let key = &self.pairs[index].key;
let key = Spanned { v: key.v.as_str(), span: key.span };
Some(if let Some(key) = K::parse(key) {
self.get_index::<V>(errors, index).map(|v| (key, v))
} else {
index += 1;
None
})
} else {
None
}
}).filter_map(|x| x)
}
pub fn get_all_spanned<'a, K: Key + 'a, V: Value + 'a>(
&'a mut self,
errors: &'a mut Errors,
) -> impl Iterator<Item=Spanned<(K::Output, V::Output)>> + 'a {
self.get_all::<Spanned<K>, Spanned<V>>(errors)
.map(|(k, v)| Spanned::new((k.v, v.v), Span::merge(k.span, v.span)))
}
fn get_index<V: Value>(&mut self, errors: &mut Errors, index: usize) -> Option<V::Output> {
let expr = self.pairs.remove(index).value;
let span = expr.span;
match V::parse(expr) {
Ok(output) => Some(output),
Err(err) => { errors.push(Spanned { v: err, span }); None }
}
}
}
impl Display for Expr {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
use Expr::*;
match self {
Ident(i) => write!(f, "{}", i),
Str(s) => write!(f, "{:?}", s),
Number(n) => write!(f, "{}", n),
Size(s) => write!(f, "{}", s),
Bool(b) => write!(f, "{}", b),
Tuple(t) => write!(f, "{}", t),
Object(o) => write!(f, "{}", o),
}
}
}
impl Display for Ident {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(f, "{}", self.0)
}
}
impl Display for Tuple {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(f, "(")?;
let mut first = true;
for item in &self.items {
if !first {
write!(f, ", ")?;
}
write!(f, "{}", item.v)?;
first = false;
}
write!(f, ")")
}
}
impl Display for Object {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
if self.pairs.len() == 0 {
return write!(f, "{{}}");
}
write!(f, "{{ ")?;
let mut first = true;
for pair in &self.pairs {
if !first {
write!(f, ", ")?;
}
write!(f, "{}", pair)?;
first = false;
}
write!(f, " }}")
}
}
impl Display for Pair {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(f, "{}: {}", self.key.v, self.value.v)
}
}
debug_display!(Expr);
debug_display!(Ident);
debug_display!(Tuple);
debug_display!(Object);
debug_display!(Pair);
|
