array-mumu 0.2.0-rc.5

Array tools plugin for the Mumu ecosystem
Documentation 
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use crate::apply::apply_n_ary_function_value;
use mumu::parser::types::Value;
use mumu::parser::interpreter::Interpreter;
use super::common::{is_placeholder, make_two_arg_partial};

pub fn array_drop_while_bridge(interp: &mut Interpreter, args: Vec<Value>) -> Result<Value, String> {
    match args.len() {
        0 => Ok(make_two_arg_partial(do_drop_while, None, None, "array-transform-drop_while-partial")),
        1 => {
            if is_placeholder(&args[0]) {
                Ok(make_two_arg_partial(do_drop_while, None, None, "array-transform-drop_while-partial"))
            } else {
                Ok(make_two_arg_partial(do_drop_while, Some(args[0].clone()), None, "array-transform-drop_while-partial"))
            }
        }
        2 => {
            let a1_pl = is_placeholder(&args[0]);
            let a2_pl = is_placeholder(&args[1]);
            if !a1_pl && !a2_pl {
                do_drop_while(interp, args[0].clone(), args[1].clone())
            } else {
                Ok(make_two_arg_partial(
                    do_drop_while,
                    if a1_pl { None } else { Some(args[0].clone()) },
                    if a2_pl { None } else { Some(args[1].clone()) },
                    "array-transform-drop_while-partial"
                ))
            }
        }
        _ => Err("array:drop_while expects 2 arguments (fn, array)".to_string()),
    }
}

fn do_drop_while(interp: &mut Interpreter, pred: Value, arr: Value) -> Result<Value, String> {
    let pred_fn = match pred {
        Value::Function(fb) => fb,
        _ => return Err("array:drop_while => first argument must be a function".to_string()),
    };
    match arr {
        Value::IntArray(xs) => {
            let mut out: Vec<i32> = Vec::new();
            let mut skipping = true;
            for v in xs {
                if skipping {
                    let ret = apply_n_ary_function_value(interp, pred_fn.clone(), vec![Value::Int(v)]);
                    match ret {
                        Ok(Value::Bool(true)) => continue,
                        _ => {
                            skipping = false;
                            out.push(v);
                        }
                    }
                } else {
                    out.push(v);
                }
            }
            Ok(Value::IntArray(out))
        }
        Value::FloatArray(xs) => {
            let mut out: Vec<f64> = Vec::new();
            let mut skipping = true;
            for v in xs {
                if skipping {
                    let ret = apply_n_ary_function_value(interp, pred_fn.clone(), vec![Value::Float(v)]);
                    match ret {
                        Ok(Value::Bool(true)) => continue,
                        _ => {
                            skipping = false;
                            out.push(v);
                        }
                    }
                } else {
                    out.push(v);
                }
            }
            Ok(Value::FloatArray(out))
        }
        Value::StrArray(xs) => {
            let mut out: Vec<String> = Vec::new();
            let mut skipping = true;
            for s in xs {
                if skipping {
                    let ret = apply_n_ary_function_value(interp, pred_fn.clone(), vec![Value::SingleString(s.clone())]);
                    match ret {
                        Ok(Value::Bool(true)) => continue,
                        _ => {
                            skipping = false;
                            out.push(s);
                        }
                    }
                } else {
                    out.push(s);
                }
            }
            Ok(Value::StrArray(out))
        }
        Value::BoolArray(xs) => {
            let mut out: Vec<bool> = Vec::new();
            let mut skipping = true;
            for b in xs {
                if skipping {
                    let ret = apply_n_ary_function_value(interp, pred_fn.clone(), vec![Value::Bool(b)]);
                    match ret {
                        Ok(Value::Bool(true)) => continue,
                        _ => {
                            skipping = false;
                            out.push(b);
                        }
                    }
                } else {
                    out.push(b);
                }
            }
            Ok(Value::BoolArray(out))
        }
        Value::MixedArray(xs) => {
            let mut out = Vec::new();
            let mut skipping = true;
            for v in xs {
                if skipping {
                    let ret = apply_n_ary_function_value(interp, pred_fn.clone(), vec![v.clone()]);
                    match ret {
                        Ok(Value::Bool(true)) => continue,
                        _ => {
                            skipping = false;
                            out.push(v);
                        }
                    }
                } else {
                    out.push(v);
                }
            }
            Ok(Value::MixedArray(out))
        }
        other => Err(format!("array:drop_while => second argument must be array, got {:?}", other)),
    }
}