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use crate::value::Value;
use crate::types::*;
impl Value {
pub fn head(&self, n: i64) -> Option<Self> {
match self.dt {
LIST => {
match self.cast_list() {
Ok(raw_list) => {
let mut res = Value::list();
let mut c: usize = 0;
for v in raw_list {
if c >= n as usize {
break;
}
res = res.push(v);
c = c + 1;
}
return Some(res);
}
Err(_) => {
return None;
}
}
}
_ => {
return Some(self.clone());
}
}
}
pub fn tail(&self, n: i64) -> Option<Self> {
match self.dt {
LIST => {
match self.cast_list() {
Ok(raw_list) => {
let mut res = Value::list();
for v in raw_list.iter().rev().take(n as usize).rev() {
res = res.push(v.clone());
}
return Some(res);
}
Err(_) => {
return None;
}
}
}
_ => {
return Some(self.clone());
}
}
}
pub fn at(&self, n: i64) -> Option<Self> {
match self.dt {
LIST => {
match self.cast_list() {
Ok(raw_list) => {
if n as usize > raw_list.len() || n < 0 {
return None;
}
return Some(raw_list[(n-1) as usize].clone());
}
Err(_) => {
return None;
}
}
}
_ => {
return Some(self.clone());
}
}
}
pub fn car(&self) -> Option<Self> {
match self.dt {
LIST => {
match &self.data {
Val::List(l_val) => {
if l_val.len() > 0 {
return Some(l_val[0].clone());
} else {
return None;
}
}
_ => None,
}
}
MATRIX => {
match &self.data {
Val::Matrix(m_val) => {
if m_val.len() > 0 {
return Some(Value::from_list(m_val[0].clone()));
} else {
return None;
}
}
_ => None,
}
}
QUEUE => {
match &self.data {
Val::Queue(_) => {
match self.cast_queue() {
Ok(val) => return Some(val),
Err(_) => return None,
}
}
_ => None,
}
}
FIFO => {
match &self.data {
Val::Queue(_) => {
match self.cast_fifo() {
Ok(val) => return Some(val),
Err(_) => return None,
}
}
_ => None,
}
}
METRICS => {
match &self.data {
Val::Metrics(m_val) => {
if m_val.len() > 0 {
let m = &m_val[0];
let mut res = Value::dict();
res = res.set("value", Value::from_float(m.data as f64));
res = res.set("ts", Value::from_stamp(m.stamp as u128));
return Some(res);
} else {
return None;
}
}
_ => None,
}
}
_ => Some(self.clone()),
}
}
pub fn cdr(&self) -> Option<Self> {
match self.dt {
LIST => {
match &self.data {
Val::List(l_val) => {
if l_val.len() > 0 {
return Some(Value::from_list(l_val[1..].to_vec()));
} else {
return None;
}
}
_ => None,
}
}
MATRIX => {
match &self.data {
Val::Matrix(m_val) => {
if m_val.len() > 0 {
return Some(Value::from_matrix(m_val[1..].to_vec()));
} else {
return None;
}
}
_ => None,
}
}
QUEUE | FIFO => return Some(self.pull()),
METRICS => {
match &self.data {
Val::Metrics(m_val) => {
if m_val.len() > 0 {
let m = &m_val[1..].to_vec();
return Some(Value::from_metrics(m.clone()));
} else {
return None;
}
}
_ => None,
}
}
_ => Some(self.clone()),
}
}
pub fn last(&self) -> Option<Self> {
match self.dt {
LIST => {
match &self.data {
Val::List(l_val) => {
if l_val.len() > 0 {
return Some(l_val[l_val.len()].clone());
} else {
return None;
}
}
_ => None,
}
}
METRICS => {
match &self.data {
Val::Metrics(m_val) => {
if m_val.len() > 0 {
let m = &m_val[m_val.len()];
let mut res = Value::dict();
res = res.set("value", Value::from_float(m.data as f64));
res = res.set("ts", Value::from_stamp(m.stamp as u128));
return Some(res);
} else {
return None;
}
}
_ => None,
}
}
_ => Some(self.clone()),
}
}
}