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use crate::{
error::HelperError,
helper::{Helper, HelperValue},
parser::ast::Node,
render::{Context, Render, Type},
};
use serde_json::Value;
fn cmp<'call, F>(ctx: &Context<'call>, cmp: F) -> HelperValue
where
F: FnOnce(f64, f64) -> bool,
{
ctx.arity(2..2)?;
let lhs = ctx.try_get(0, &[Type::Number])?;
let rhs = ctx.try_get(1, &[Type::Number])?;
match (lhs, rhs) {
(Value::Number(lhs), Value::Number(rhs)) => {
if let (Some(lhs), Some(rhs)) = (lhs.as_f64(), rhs.as_f64()) {
Ok(Some(Value::Bool(cmp(lhs, rhs))))
} else {
Err(HelperError::InvalidNumericalOperand(
ctx.name().to_string(),
))
}
}
_ => Err(HelperError::InvalidNumericalOperand(ctx.name().to_string())),
}
}
pub struct Equal;
impl Helper for Equal {
fn call<'render, 'call>(
&self,
_rc: &mut Render<'render>,
ctx: &Context<'call>,
_template: Option<&'render Node<'render>>,
) -> HelperValue {
cmp(ctx, |lhs: f64, rhs: f64| lhs == rhs)
}
}
pub struct NotEqual;
impl Helper for NotEqual {
fn call<'render, 'call>(
&self,
_rc: &mut Render<'render>,
ctx: &Context<'call>,
_template: Option<&'render Node<'render>>,
) -> HelperValue {
cmp(ctx, |lhs: f64, rhs: f64| lhs != rhs)
}
}
pub struct GreaterThan;
impl Helper for GreaterThan {
fn call<'render, 'call>(
&self,
_rc: &mut Render<'render>,
ctx: &Context<'call>,
_template: Option<&'render Node<'render>>,
) -> HelperValue {
cmp(ctx, |lhs: f64, rhs: f64| lhs > rhs)
}
}
pub struct GreaterThanEqual;
impl Helper for GreaterThanEqual {
fn call<'render, 'call>(
&self,
_rc: &mut Render<'render>,
ctx: &Context<'call>,
_template: Option<&'render Node<'render>>,
) -> HelperValue {
cmp(ctx, |lhs: f64, rhs: f64| lhs >= rhs)
}
}
pub struct LessThan;
impl Helper for LessThan {
fn call<'render, 'call>(
&self,
_rc: &mut Render<'render>,
ctx: &Context<'call>,
_template: Option<&'render Node<'render>>,
) -> HelperValue {
cmp(ctx, |lhs: f64, rhs: f64| lhs < rhs)
}
}
pub struct LessThanEqual;
impl Helper for LessThanEqual {
fn call<'render, 'call>(
&self,
_rc: &mut Render<'render>,
ctx: &Context<'call>,
_template: Option<&'render Node<'render>>,
) -> HelperValue {
cmp(ctx, |lhs: f64, rhs: f64| lhs <= rhs)
}
}