bd5836e25d
* WIP getting scopes right * finish adding initial support * Finish with alias and add startup commands
58 lines
1.4 KiB
Rust
58 lines
1.4 KiB
Rust
use crate::value::{Primitive, UntaggedValue, Value};
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use indexmap::IndexMap;
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use serde::{Deserialize, Serialize};
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use std::fmt::Debug;
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/// An evaluation scope. Scopes map variable names to Values and aid in evaluating blocks and expressions.
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/// Additionally, holds the value for the special $it variable, a variable used to refer to the value passing
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/// through the pipeline at that moment
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#[derive(Deserialize, Serialize, Debug, Clone)]
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pub struct Scope {
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pub it: Value,
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pub vars: IndexMap<String, Value>,
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}
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impl Scope {
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/// Create a new scope
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pub fn new(it: Value) -> Scope {
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Scope {
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it,
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vars: IndexMap::new(),
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}
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}
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}
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impl Scope {
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/// Create an empty scope
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pub fn empty() -> Scope {
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Scope {
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it: UntaggedValue::Primitive(Primitive::Nothing).into_untagged_value(),
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vars: IndexMap::new(),
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}
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}
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/// Create an empty scope, setting $it to a known Value
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pub fn it_value(value: Value) -> Scope {
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Scope {
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it: value,
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vars: IndexMap::new(),
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}
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}
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pub fn set_it(self, value: Value) -> Scope {
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Scope {
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it: value,
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vars: self.vars,
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}
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}
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pub fn set_var(self, name: String, value: Value) -> Scope {
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let mut new_vars = self.vars.clone();
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new_vars.insert(name, value);
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Scope {
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it: self.it,
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vars: new_vars,
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}
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}
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}
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