forked from extern/nushell
98 lines
3.1 KiB
Rust
98 lines
3.1 KiB
Rust
use crate::object::base::Block;
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use crate::parser::{
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hir::{self, Expression, RawExpression},
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CommandRegistry, Spanned, Text,
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};
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use crate::prelude::*;
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use derive_new::new;
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use indexmap::IndexMap;
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#[derive(new)]
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crate struct Scope {
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it: Value,
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#[new(default)]
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vars: IndexMap<String, Value>,
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}
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impl Scope {
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crate fn empty() -> Scope {
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Scope {
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it: Value::nothing(),
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vars: IndexMap::new(),
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}
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}
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}
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crate fn evaluate_baseline_expr(
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expr: &Expression,
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registry: &dyn CommandRegistry,
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scope: &Scope,
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source: &str,
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) -> Result<Spanned<Value>, ShellError> {
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match &expr.item {
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RawExpression::Literal(literal) => Ok(evaluate_literal(expr.copy_span(*literal), source)),
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RawExpression::Variable(var) => evaluate_reference(var, scope, source),
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RawExpression::Binary(binary) => {
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let left = evaluate_baseline_expr(binary.left(), registry, scope, source)?;
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let right = evaluate_baseline_expr(binary.right(), registry, scope, source)?;
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match left.compare(binary.op(), &*right) {
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Some(result) => Ok(Spanned::from_item(Value::boolean(result), *expr.span())),
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None => Err(ShellError::unimplemented(&format!(
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"Comparison failure {:?}",
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binary
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))),
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}
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}
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RawExpression::Block(block) => Ok(Spanned::from_item(
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Value::Block(Block::new(*block.clone(), Text::from(source))), // TODO: Pass Text around
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block.span(),
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)),
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RawExpression::Path(path) => {
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let value = evaluate_baseline_expr(path.head(), registry, scope, source)?;
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let mut value = value.item();
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for name in path.tail() {
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let next = value.get_data_by_key(name);
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match next {
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None => return Err(ShellError::unimplemented("Invalid property from path")),
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Some(next) => value = next,
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};
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}
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Ok(Spanned::from_item(value.clone(), expr.span()))
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}
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RawExpression::Boolean(_boolean) => unimplemented!(),
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}
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}
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fn evaluate_literal(literal: Spanned<hir::Literal>, source: &str) -> Spanned<Value> {
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let result = match literal.item {
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hir::Literal::Integer(int) => Value::int(int),
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hir::Literal::Size(_int, _unit) => unimplemented!(),
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hir::Literal::String(span) => Value::string(span.slice(source)),
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hir::Literal::Bare => Value::string(literal.span().slice(source)),
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};
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literal.map(|_| result)
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}
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fn evaluate_reference(
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name: &hir::Variable,
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scope: &Scope,
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source: &str,
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) -> Result<Spanned<Value>, ShellError> {
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match name {
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hir::Variable::It(span) => Ok(Spanned::from_item(scope.it.copy(), span)),
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hir::Variable::Other(span) => Ok(Spanned::from_item(
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scope
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.vars
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.get(span.slice(source))
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.map(|v| v.copy())
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.unwrap_or_else(|| Value::nothing()),
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span,
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)),
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}
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}
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