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//! Function and method calling for Pine Script runtime
//!
//! Handles call_function, call_method, and call_array_method.
use super::Runtime;
use crate::scripting::ast::Expr;
use crate::scripting::types::{RuntimeError, Value};
impl Runtime {
/// Call a function by name
pub(crate) fn call_function(
&mut self,
name: &str,
args: &[Expr],
) -> Result<Value, RuntimeError> {
// Evaluate arguments
let mut arg_values = Vec::new();
for arg in args {
arg_values.push(self.eval_expr(arg)?);
}
// Look up built-in function
if let Some(func) = self.builtins.get(name).cloned() {
return func(&arg_values, &self.context);
}
// Handle special functions
match name {
"plot" => {
// plot() function - handled separately
Ok(Value::Null)
}
"indicator" | "strategy" => {
// Metadata functions - do nothing during execution
Ok(Value::Null)
}
"na" => {
// Check if value is NaN
if let Some(val) = arg_values.first() {
match val {
Value::Number(n) => Ok(Value::Boolean(n.is_nan())),
Value::Null => Ok(Value::Boolean(true)),
_ => Ok(Value::Boolean(false)),
}
} else {
Ok(Value::Number(f64::NAN))
}
}
"nz" => {
// Replace NaN with default
let val = arg_values.first().cloned().unwrap_or(Value::Null);
let default = arg_values.get(1).cloned().unwrap_or(Value::Number(0.0));
if let Value::Number(n) = &val {
if n.is_nan() { Ok(default) } else { Ok(val) }
} else {
Ok(val)
}
}
"fixnan" => {
// Forward fill NaN values
if let Some(Value::Number(n)) = arg_values.first() {
if n.is_nan() {
Ok(Value::Number(0.0)) // Should carry forward, simplified
} else {
Ok(Value::Number(*n))
}
} else {
Ok(Value::Number(0.0))
}
}
_ => Err(RuntimeError::FunctionNotFound(name.to_string())),
}
}
/// Call a method on a namespace (e.g., ta.sma, array.push)
pub(crate) fn call_method(
&mut self,
namespace: &str,
method: &str,
args: &[Expr],
) -> Result<Value, RuntimeError> {
// Evaluate arguments
let mut arg_values = Vec::new();
for arg in args {
arg_values.push(self.eval_expr(arg)?);
}
// Handle array.* methods
if namespace == "array" {
return self.call_array_method(method, &arg_values);
}
// Handle strategy.* methods
if namespace == "strategy" {
return self.call_strategy_method(method, &arg_values);
}
// Handle namespaced functions (ta.sma, ta.ema, etc.)
let full_name = format!("{namespace}.{method}");
// Look up in builtins
if let Some(func) = self.builtins.get(&full_name).cloned() {
return func(&arg_values, &self.context);
}
Err(RuntimeError::FunctionNotFound(full_name))
}
/// Handle array.* methods for Pine Script array support
pub(crate) fn call_array_method(
&mut self,
method: &str,
args: &[Value],
) -> Result<Value, RuntimeError> {
match method {
// array.new_float(size, initial_val)
"new_float" | "new" => {
let size = args.first().and_then(|v| v.as_num().ok()).unwrap_or(0.0) as usize;
let initial = args
.get(1)
.and_then(|v| v.as_num().ok())
.unwrap_or(f64::NAN);
let arr: Vec<Value> = vec![Value::Number(initial); size];
Ok(Value::Array(arr))
}
// array.new_bool(size, initial_val)
"new_bool" => {
let size = args.first().and_then(|v| v.as_num().ok()).unwrap_or(0.0) as usize;
let initial = args
.get(1)
.and_then(|v| v.as_boolean().ok())
.unwrap_or(false);
let arr: Vec<Value> = vec![Value::Boolean(initial); size];
Ok(Value::Array(arr))
}
// array.new_string(size, initial_val)
"new_string" => {
let size = args.first().and_then(|v| v.as_num().ok()).unwrap_or(0.0) as usize;
let initial = if let Some(Value::String(s)) = args.get(1) {
s.clone()
} else {
String::new()
};
let arr: Vec<Value> = vec![Value::String(initial); size];
Ok(Value::Array(arr))
}
// array.size(arr)
"size" => {
if let Some(arr) = args.first() {
match arr {
Value::Array(a) => Ok(Value::Number(a.len() as f64)),
_ => Err(RuntimeError::TypeError(
"array.size requires an array".to_string(),
)),
}
} else {
Ok(Value::Number(0.0))
}
}
// array.get(arr, index)
"get" => {
let arr = args.first().ok_or_else(|| {
RuntimeError::InvalidArguments("array.get requires array and index".to_string())
})?;
let idx = args.get(1).and_then(|v| v.as_num().ok()).ok_or_else(|| {
RuntimeError::InvalidArguments("array.get requires index".to_string())
})? as usize;
match arr {
Value::Array(a) => {
if idx < a.len() {
Ok(a[idx].clone())
} else {
Err(RuntimeError::IndexOutOfBounds)
}
}
_ => Err(RuntimeError::TypeError(
"array.get requires an array".to_string(),
)),
}
}
// array.push(arr, value)
"push" => {
let arr = args.first().ok_or_else(|| {
RuntimeError::InvalidArguments(
"array.push requires array and value".to_string(),
)
})?;
let value = args.get(1).cloned().unwrap_or(Value::Null);
match arr {
Value::Array(a) => {
let mut new_arr = a.clone();
new_arr.push(value);
Ok(Value::Array(new_arr))
}
_ => Err(RuntimeError::TypeError(
"array.push requires an array".to_string(),
)),
}
}
// array.pop(arr)
"pop" => {
let arr = args.first().ok_or_else(|| {
RuntimeError::InvalidArguments("array.pop requires array".to_string())
})?;
match arr {
Value::Array(a) => {
if let Some(val) = a.last() {
Ok(val.clone())
} else {
Ok(Value::Null)
}
}
_ => Err(RuntimeError::TypeError(
"array.pop requires an array".to_string(),
)),
}
}
// array.sum(arr)
"sum" => {
let arr = args.first().ok_or_else(|| {
RuntimeError::InvalidArguments("array.sum requires array".to_string())
})?;
match arr {
Value::Array(a) => {
let sum: f64 = a.iter().filter_map(|v| v.as_num().ok()).sum();
Ok(Value::Number(sum))
}
_ => Err(RuntimeError::TypeError(
"array.sum requires an array".to_string(),
)),
}
}
// array.avg(arr)
"avg" => {
let arr = args.first().ok_or_else(|| {
RuntimeError::InvalidArguments("array.avg requires array".to_string())
})?;
match arr {
Value::Array(a) => {
let nums: Vec<f64> = a.iter().filter_map(|v| v.as_num().ok()).collect();
if nums.is_empty() {
Ok(Value::Number(f64::NAN))
} else {
let sum: f64 = nums.iter().sum();
Ok(Value::Number(sum / nums.len() as f64))
}
}
_ => Err(RuntimeError::TypeError(
"array.avg requires an array".to_string(),
)),
}
}
// array.max(arr)
"max" => {
let arr = args.first().ok_or_else(|| {
RuntimeError::InvalidArguments("array.max requires array".to_string())
})?;
match arr {
Value::Array(a) => {
let max = a
.iter()
.filter_map(|v| v.as_num().ok())
.fold(f64::NEG_INFINITY, f64::max);
Ok(Value::Number(max))
}
_ => Err(RuntimeError::TypeError(
"array.max requires an array".to_string(),
)),
}
}
// array.min(arr)
"min" => {
let arr = args.first().ok_or_else(|| {
RuntimeError::InvalidArguments("array.min requires array".to_string())
})?;
match arr {
Value::Array(a) => {
let min = a
.iter()
.filter_map(|v| v.as_num().ok())
.fold(f64::INFINITY, f64::min);
Ok(Value::Number(min))
}
_ => Err(RuntimeError::TypeError(
"array.min requires an array".to_string(),
)),
}
}
// array.stdev(arr)
"stdev" => {
let arr = args.first().ok_or_else(|| {
RuntimeError::InvalidArguments("array.stdev requires array".to_string())
})?;
match arr {
Value::Array(a) => {
let nums: Vec<f64> = a.iter().filter_map(|v| v.as_num().ok()).collect();
if nums.len() < 2 {
Ok(Value::Number(0.0))
} else {
let mean: f64 = nums.iter().sum::<f64>() / nums.len() as f64;
let variance: f64 =
nums.iter().map(|x| (x - mean).powi(2)).sum::<f64>()
/ nums.len() as f64;
Ok(Value::Number(variance.sqrt()))
}
}
_ => Err(RuntimeError::TypeError(
"array.stdev requires an array".to_string(),
)),
}
}
// array.first(arr)
"first" => {
let arr = args.first().ok_or_else(|| {
RuntimeError::InvalidArguments("array.first requires array".to_string())
})?;
match arr {
Value::Array(a) => {
if let Some(val) = a.first() {
Ok(val.clone())
} else {
Ok(Value::Null)
}
}
_ => Err(RuntimeError::TypeError(
"array.first requires an array".to_string(),
)),
}
}
// array.last(arr)
"last" => {
let arr = args.first().ok_or_else(|| {
RuntimeError::InvalidArguments("array.last requires array".to_string())
})?;
match arr {
Value::Array(a) => {
if let Some(val) = a.last() {
Ok(val.clone())
} else {
Ok(Value::Null)
}
}
_ => Err(RuntimeError::TypeError(
"array.last requires an array".to_string(),
)),
}
}
// array.from(...values)
"from" => Ok(Value::Array(args.to_vec())),
// array.copy(arr)
"copy" => {
let arr = args.first().ok_or_else(|| {
RuntimeError::InvalidArguments("array.copy requires array".to_string())
})?;
match arr {
Value::Array(a) => Ok(Value::Array(a.clone())),
_ => Err(RuntimeError::TypeError(
"array.copy requires an array".to_string(),
)),
}
}
// array.clear(arr)
"clear" => Ok(Value::Array(Vec::new())),
// array.includes(arr, value) / array.indexof(arr, value)
"includes" | "indexof" => {
let arr = args.first().ok_or_else(|| {
RuntimeError::InvalidArguments(
"array.includes requires array and value".to_string(),
)
})?;
let search_val = args.get(1);
match (arr, search_val) {
(Value::Array(a), Some(val)) => {
for (idx, item) in a.iter().enumerate() {
// Simple equality check for numbers
if let (Value::Number(n1), Value::Number(n2)) = (item, val)
&& (n1 - n2).abs() < f64::EPSILON
{
return if method == "includes" {
Ok(Value::Boolean(true))
} else {
Ok(Value::Number(idx as f64))
};
}
}
if method == "includes" {
Ok(Value::Boolean(false))
} else {
Ok(Value::Number(-1.0))
}
}
_ => Err(RuntimeError::TypeError(
"array.includes requires array and value".to_string(),
)),
}
}
// array.fill(arr, value)
"fill" => {
let arr = args.first().ok_or_else(|| {
RuntimeError::InvalidArguments(
"array.fill requires array and value".to_string(),
)
})?;
let fill_val = args.get(1).cloned().unwrap_or(Value::Number(0.0));
match arr {
Value::Array(a) => {
let new_arr: Vec<Value> = vec![fill_val; a.len()];
Ok(Value::Array(new_arr))
}
_ => Err(RuntimeError::TypeError(
"array.fill requires an array".to_string(),
)),
}
}
// array.slice(arr, start, end)
"slice" => {
let arr = args.first().ok_or_else(|| {
RuntimeError::InvalidArguments("array.slice requires array".to_string())
})?;
let start = args.get(1).and_then(|v| v.as_num().ok()).unwrap_or(0.0) as usize;
let end = args.get(2).and_then(|v| v.as_num().ok());
match arr {
Value::Array(a) => {
let end_idx = end.map(|e| e as usize).unwrap_or(a.len());
let end_idx = end_idx.min(a.len());
let start_idx = start.min(end_idx);
Ok(Value::Array(a[start_idx..end_idx].to_vec()))
}
_ => Err(RuntimeError::TypeError(
"array.slice requires an array".to_string(),
)),
}
}
// array.reverse(arr)
"reverse" => {
let arr = args.first().ok_or_else(|| {
RuntimeError::InvalidArguments("array.reverse requires array".to_string())
})?;
match arr {
Value::Array(a) => {
let mut reversed = a.clone();
reversed.reverse();
Ok(Value::Array(reversed))
}
_ => Err(RuntimeError::TypeError(
"array.reverse requires an array".to_string(),
)),
}
}
// array.sort(arr)
"sort" => {
let arr = args.first().ok_or_else(|| {
RuntimeError::InvalidArguments("array.sort requires array".to_string())
})?;
match arr {
Value::Array(a) => {
let mut nums: Vec<f64> = a.iter().filter_map(|v| v.as_num().ok()).collect();
nums.sort_by(|a, b| a.partial_cmp(b).unwrap_or(std::cmp::Ordering::Equal));
Ok(Value::Array(nums.into_iter().map(Value::Number).collect()))
}
_ => Err(RuntimeError::TypeError(
"array.sort requires an array".to_string(),
)),
}
}
_ => Err(RuntimeError::FunctionNotFound(format!("array.{method}"))),
}
}
}