forked from extern/nushell
9068093081
# Description
This PR does a few things to help improve type hovers and, in the
process, fixes a few outstanding issues in the type system. Here's a
list of the changes:
* `for` now will try to infer the type of the iteration variable based
on the expression it's given. This fixes things like `for x in [1, 2, 3]
{ }` where `x` now properly gets the int type.
* Removed old input/output type fields from the signature, focuses on
the vec of signatures. Updated a bunch of dataframe commands that hadn't
moved over. This helps tie things together a bit better
* Fixed inference of types from subexpressions to use the last
expression in the block
* Fixed handling of explicit types in `let` and `mut` calls, so we now
respect that as the authoritative type
I also tried to add `def` input/output type inference, but unfortunately
we only know the predecl types universally, which means we won't have
enough information to properly know what the types of the custom
commands are.
# User-Facing Changes
Script typechecking will get tighter in some cases
Hovers should be more accurate in some cases that previously resorted to
any.
# Tests + Formatting
<!--
Don't forget to add tests that cover your changes.
Make sure you've run and fixed any issues with these commands:
- `cargo fmt --all -- --check` to check standard code formatting (`cargo
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- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect -A clippy::result_large_err` to check that
you're using the standard code style
- `cargo test --workspace` to check that all tests pass
- `cargo run -- crates/nu-std/tests/run.nu` to run the tests for the
standard library
> **Note**
> from `nushell` you can also use the `toolkit` as follows
> ```bash
> use toolkit.nu # or use an `env_change` hook to activate it
automatically
> toolkit check pr
> ```
-->
# After Submitting
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documentation](https://github.com/nushell/nushell.github.io) after the
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---------
Co-authored-by: Darren Schroeder <343840+fdncred@users.noreply.github.com>
103 lines
2.7 KiB
Rust
103 lines
2.7 KiB
Rust
use super::super::values::NuExpression;
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use nu_engine::CallExt;
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use nu_protocol::{
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ast::Call,
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engine::{Command, EngineState, Stack},
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Category, Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Type, Value,
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};
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#[derive(Clone)]
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pub struct ExprAlias;
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impl Command for ExprAlias {
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fn name(&self) -> &str {
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"dfr as"
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}
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fn usage(&self) -> &str {
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"Creates an alias expression."
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}
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fn signature(&self) -> Signature {
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Signature::build(self.name())
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.required(
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"Alias name",
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SyntaxShape::String,
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"Alias name for the expression",
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)
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.input_output_type(
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Type::Custom("expression".into()),
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Type::Custom("expression".into()),
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)
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.category(Category::Custom("expression".into()))
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}
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fn examples(&self) -> Vec<Example> {
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vec![Example {
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description: "Creates and alias expression",
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example: "dfr col a | dfr as new_a | dfr into-nu",
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result: {
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let cols = vec!["expr".into(), "value".into()];
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let expr = Value::test_string("column");
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let value = Value::test_string("a");
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let expr = Value::Record {
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cols,
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vals: vec![expr, value],
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span: Span::test_data(),
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};
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let cols = vec!["expr".into(), "alias".into()];
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let value = Value::test_string("new_a");
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let record = Value::Record {
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cols,
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vals: vec![expr, value],
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span: Span::test_data(),
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};
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Some(record)
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},
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}]
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}
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fn search_terms(&self) -> Vec<&str> {
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vec!["aka", "abbr", "otherwise"]
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}
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fn run(
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&self,
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engine_state: &EngineState,
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stack: &mut Stack,
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call: &Call,
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input: PipelineData,
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) -> Result<PipelineData, ShellError> {
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let alias: String = call.req(engine_state, stack, 0)?;
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let expr = NuExpression::try_from_pipeline(input, call.head)?;
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let expr: NuExpression = expr.into_polars().alias(alias.as_str()).into();
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Ok(PipelineData::Value(
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NuExpression::into_value(expr, call.head),
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None,
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))
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}
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}
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#[cfg(test)]
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mod test {
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use super::super::super::test_dataframe::test_dataframe;
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use super::*;
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use crate::dataframe::expressions::ExprAsNu;
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use crate::dataframe::expressions::ExprCol;
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#[test]
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fn test_examples() {
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test_dataframe(vec![
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Box::new(ExprAlias {}),
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Box::new(ExprCol {}),
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Box::new(ExprAsNu {}),
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])
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}
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}
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