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use std::rc::Rc;
use linked_hash_map::LinkedHashMap;
#[derive(Clone, Debug, PartialEq)]
pub enum JVal{
Null(Span),
Undefined(Span),
Bool(bool, Span),
String(String, Span),
Int(i64, Span),
Double(f64, Span),
Array(Vec<JVal>, Span),
Map(LinkedHashMap<String, JVal>, Span)
}
impl JVal{
pub fn as_object(&self) -> Option<&LinkedHashMap<String, JVal>>{
return match self {
JVal::Map(map, _span) => { Some(map) }
_ => { None }
}
}
pub fn as_array(&self) -> Option<&Vec<JVal>>{
return match self{
JVal::Array(a, _) => { Some(a) },
_ =>{ None }
}
}
pub fn as_str(&self) -> Option<&str>{
return match self {
JVal::String(s, _span) => { Some(s) }
_ => { None }
}
}
pub fn as_num(&self) -> Option<f64>{
return match self{
JVal::Double(d, _) =>{ Some(*d) },
_ =>{ None }
}
}
pub fn as_int(&self) -> Option<i64>{
return match self{
JVal::Int(i, _) =>{ Some(*i) },
_ =>{ None }
}
}
pub fn as_bool(&self) -> Option<bool>{
return match self{
JVal::Bool(b, _) =>{ Some(*b) }
_ =>{ None }
}
}
pub fn is_null(&self) -> bool{
return match self{
JVal::Null(_) => true,
_ => false,
}
}
pub fn is_undefined(&self) -> bool{
return match self{
JVal::Undefined(_) => true,
_ => false,
}
}
pub fn span(&self) -> &Span{
return match self{
JVal::Null(s) => s,
JVal::Undefined(s) => s,
JVal::Bool(_,s) => s,
JVal::String(_, s) => s,
JVal::Double(_, s) => s,
JVal::Int(_,s) => s,
JVal::Array(_, s) => s,
JVal::Map(_, s) => s,
}
}
pub fn slice(&self) -> &str{
self.span().slice()
}
pub fn line_str(&self) -> String{
self.span().line_str()
}
}
#[derive(Clone, Debug, PartialEq)]
pub struct Span{
pub start : usize,
pub end : usize,
pub text : Rc<String>,
}
impl Span{
pub fn line_num(&self) -> usize {
let input = self.text.as_str();
let mut pos = self.start;
if pos > input.len() {
panic!("position out of bounds");
}
let slice = unsafe { std::str::from_utf8_unchecked(&input.as_bytes()[..pos]) };
let mut chars = slice.chars().peekable();
let mut line_col = (1, 1);
while pos != 0 {
match chars.next() {
Some('\r') => {
if let Some(&'\n') = chars.peek() {
chars.next();
if pos == 1 {
pos -= 1;
} else {
pos -= 2;
}
line_col = (line_col.0 + 1, 1);
} else {
pos -= 1;
line_col = (line_col.0, line_col.1 + 1);
}
}
Some('\n') => {
pos -= 1;
line_col = (line_col.0 + 1, 1);
}
Some(c) => {
pos -= c.len_utf8();
line_col = (line_col.0, line_col.1 + 1);
}
None => unreachable!()
}
}
line_col.0
}
pub fn line_str(&self) -> String{
self.line_num().to_string()
}
pub fn slice(&self) -> &str{
&self.text.as_str()[self.start..self.end]
}
}