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use crate::ast::{FromTokens, ParseError, Tokens, TryFromTokens, Variable};
use crate::lexical_token::{FloatValue, IntValue, Name, PunctuatorType, StringValue};
use crate::{Span, HasSpan};
use bluejay_core::AsIter;
pub type Value<'a, const CONST: bool> = bluejay_core::Value<
CONST,
Variable<'a>,
IntValue,
FloatValue,
StringValue,
BooleanValue,
Name<'a>,
Name<'a>,
ListValue<'a, CONST>,
ObjectValue<'a, CONST>,
>;
impl<'a, const CONST: bool> FromTokens<'a> for Value<'a, CONST> {
fn from_tokens(tokens: &mut impl Tokens<'a>) -> Result<Self, ParseError> {
None.or_else(|| {
if CONST {
None
} else {
Variable::try_from_tokens(tokens).map(|res| res.map(Self::Variable))
}
})
.or_else(|| {
tokens
.next_if_int_value()
.map(|i| Ok(Self::Integer(i)))
.or_else(|| tokens.next_if_float_value().map(|f| Ok(Self::Float(f))))
.or_else(|| tokens.next_if_string_value().map(|s| Ok(Self::String(s))))
.or_else(|| {
tokens.next_if_name().map(|name| {
Ok(match name.as_str() {
"true" => Self::Boolean(BooleanValue {
value: true,
span: name.span(),
}),
"false" => Self::Boolean(BooleanValue {
value: false,
span: name.span(),
}),
"null" => Self::Null(name),
_ => Self::Enum(name),
})
})
})
.or_else(|| {
tokens
.next_if_punctuator(PunctuatorType::OpenSquareBracket)
.map(|open_span| {
let mut list: Vec<Self> = Vec::new();
let close_span = loop {
if let Some(close_span) =
tokens.next_if_punctuator(PunctuatorType::CloseSquareBracket)
{
break close_span;
}
list.push(Self::from_tokens(tokens)?);
};
let span = open_span.merge(&close_span);
Ok(Self::List(ListValue {
elements: list,
span,
}))
})
})
.or_else(|| {
tokens
.next_if_punctuator(PunctuatorType::OpenBrace)
.map(|open_span| {
let mut object: Vec<_> = Vec::new();
let close_span = loop {
if let Some(close_span) =
tokens.next_if_punctuator(PunctuatorType::CloseBrace)
{
break close_span;
}
let name = tokens.expect_name()?;
tokens.expect_punctuator(PunctuatorType::Colon)?;
let value = Self::from_tokens(tokens)?;
object.push((name, value));
};
let span = open_span.merge(&close_span);
Ok(Self::Object(ObjectValue {
fields: object,
span,
}))
})
})
})
.unwrap_or_else(|| {
Err(tokens
.next()
.map(|token| ParseError::UnexpectedToken { span: token.span() })
.unwrap_or_else(|| tokens.unexpected_eof()))
})
}
}
impl<'a, const CONST: bool> HasSpan for Value<'a, CONST> {
fn span(&self) -> Span {
match self {
Self::Boolean(b) => b.span.clone(),
Self::Enum(e) => e.span(),
Self::Float(f) => f.span(),
Self::Integer(i) => i.span(),
Self::List(l) => l.span.clone(),
Self::Null(n) => n.span(),
Self::Object(o) => o.span.clone(),
Self::String(s) => s.span(),
Self::Variable(v) => v.span(),
}
}
}
pub type ConstValue<'a> = Value<'a, true>;
pub type VariableValue<'a> = Value<'a, false>;
#[derive(Debug)]
pub struct BooleanValue {
value: bool,
span: Span,
}
impl bluejay_core::BooleanValue for BooleanValue {
fn to_bool(&self) -> bool {
self.value
}
}
#[derive(Debug)]
pub struct ListValue<'a, const CONST: bool> {
elements: Vec<Value<'a, CONST>>,
span: Span,
}
impl<'a, const CONST: bool> AsRef<[Value<'a, CONST>]> for ListValue<'a, CONST> {
fn as_ref(&self) -> &[Value<'a, CONST>] {
&self.elements
}
}
impl<'a, const CONST: bool> bluejay_core::ListValue<Value<'a, CONST>> for ListValue<'a, CONST> {}
#[derive(Debug)]
pub struct ObjectValue<'a, const CONST: bool> {
fields: Vec<(Name<'a>, Value<'a, CONST>)>,
span: Span,
}
impl<'a, const CONST: bool> bluejay_core::ObjectValue<Value<'a, CONST>> for ObjectValue<'a, CONST> {
type Iterator<'b> = std::iter::Map<std::slice::Iter<'b, (Name<'a>, Value<'a, CONST>)>, fn(&'b (Name<'a>, Value<'a, CONST>)) -> (&'b str, &'b Value<'a, CONST>)> where 'a: 'b;
fn iter(&self) -> Self::Iterator<'_> {
self.fields.iter().map(|(key, value)| (key.as_str(), value))
}
}
impl<'a, const CONST: bool> AsIter for ObjectValue<'a, CONST> {
type Item = (Name<'a>, Value<'a, CONST>);
type Iterator<'b> = std::slice::Iter<'b, (Name<'a>, Value<'a, CONST>)> where 'a: 'b;
fn iter(&self) -> Self::Iterator<'_> {
self.fields.iter()
}
}
impl bluejay_core::IntegerValue for IntValue {
fn to_i32(&self) -> i32 {
self.value()
}
}
impl bluejay_core::FloatValue for FloatValue {
fn to_f64(&self) -> f64 {
self.value()
}
}
impl bluejay_core::StringValue for StringValue {}
impl<'a> bluejay_core::EnumValue for Name<'a> {}