forked from extern/nushell
eaec480f42
# Description This fix changes pipelines to allow them to actually be empty. Mapping over empty pipelines gives empty pipelines. Empty pipelines immediately return `None` when iterated. This removes a some of where `Span::new(0, 0)` was coming from, though there are other cases where we still use it. # User-Facing Changes None # 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 fmt --all` applies these changes) - `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A clippy::needless_collect` to check that you're using the standard code style - `cargo test --workspace` to check that all tests pass # After Submitting If your PR had any user-facing changes, update [the documentation](https://github.com/nushell/nushell.github.io) after the PR is merged, if necessary. This will help us keep the docs up to date.
79 lines
2.2 KiB
Rust
79 lines
2.2 KiB
Rust
use nu_engine::CallExt;
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use nu_parser::parse;
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use nu_protocol::{
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ast::Call,
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engine::{Command, EngineState, Stack, StateWorkingSet},
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Category, Example, PipelineData, ShellError, Signature, Span, Spanned, SyntaxShape, Type,
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Value,
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};
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#[derive(Clone)]
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pub struct Ast;
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impl Command for Ast {
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fn name(&self) -> &str {
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"ast"
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}
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fn usage(&self) -> &str {
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"Print the abstract syntax tree (ast) for a pipeline."
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}
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fn signature(&self) -> Signature {
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Signature::build("ast")
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.input_output_types(vec![(Type::Nothing, Type::Nothing)])
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.required(
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"pipeline",
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SyntaxShape::String,
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"the pipeline to print the ast for",
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)
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.category(Category::Core)
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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 pipeline: Spanned<String> = call.req(engine_state, stack, 0)?;
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let mut working_set = StateWorkingSet::new(engine_state);
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let (output, err) = parse(&mut working_set, None, pipeline.item.as_bytes(), false, &[]);
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eprintln!("output: {:#?}\nerror: {:#?}", output, err);
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Ok(PipelineData::empty())
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}
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fn examples(&self) -> Vec<Example> {
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vec![
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Example {
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description: "Print the ast of a string",
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example: "ast 'hello'",
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result: Some(Value::nothing(Span::test_data())),
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},
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Example {
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description: "Print the ast of a pipeline",
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example: "ast 'ls | where name =~ README'",
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result: Some(Value::nothing(Span::test_data())),
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},
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Example {
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description: "Print the ast of a pipeline with an error",
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example: "ast 'for x in 1..10 { echo $x '",
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result: Some(Value::nothing(Span::test_data())),
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},
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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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#[test]
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fn test_examples() {
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use super::Ast;
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use crate::test_examples;
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test_examples(Ast {})
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}
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}
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