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Custom command input/output types (#9690)
# Description This adds input/output types to custom commands. These are input/output pairs that related an input type to an output type. For example (a single int-to-int input/output pair): ``` def foo []: int -> int { ... } ``` You can also have multiple input/output pairs: ``` def bar []: [int -> string, string -> list<string>] { ... } ``` These types are checked during definition time in the parser. If the block does not match the type, the user will get a parser error. This `:` to begin the input/output signatures should immediately follow the argument signature as shown above. The PR also improves type parsing by re-using the shape parser. The shape parser is now the canonical way to parse types/shapes in user code. This PR also splits `extern` into `extern`/`extern-wrapped` because of the parser limitation that a multi-span argument (which Signature now is) can't precede an optional argument. `extern-wrapped` now takes the required block that was previously optional. # User-Facing Changes The change to `extern` to split into `extern` and `extern-wrapped` is a breaking change. # 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 -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 -- -c "use std testing; testing run-tests --path crates/nu-std"` 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 <!-- 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. -->
This commit is contained in:
parent
ba766de5d1
commit
53ae03bd63
@ -19,7 +19,6 @@ impl Command for Extern {
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.input_output_types(vec![(Type::Nothing, Type::Nothing)])
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.required("def_name", SyntaxShape::String, "definition name")
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.required("params", SyntaxShape::Signature, "parameters")
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.optional("body", SyntaxShape::Block, "wrapper function block")
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.category(Category::Core)
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}
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52
crates/nu-cmd-lang/src/core_commands/extern_wrapped.rs
Normal file
52
crates/nu-cmd-lang/src/core_commands/extern_wrapped.rs
Normal file
@ -0,0 +1,52 @@
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use nu_protocol::ast::Call;
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use nu_protocol::engine::{Command, EngineState, Stack};
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use nu_protocol::{Category, Example, PipelineData, ShellError, Signature, SyntaxShape, Type};
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#[derive(Clone)]
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pub struct ExternWrapped;
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impl Command for ExternWrapped {
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fn name(&self) -> &str {
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"extern-wrapped"
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}
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fn usage(&self) -> &str {
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"Define a signature for an external command."
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}
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fn signature(&self) -> nu_protocol::Signature {
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Signature::build("extern-wrapped")
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.input_output_types(vec![(Type::Nothing, Type::Nothing)])
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.required("def_name", SyntaxShape::String, "definition name")
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.required("params", SyntaxShape::Signature, "parameters")
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.required("body", SyntaxShape::Block, "wrapper function block")
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.category(Category::Core)
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}
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fn extra_usage(&self) -> &str {
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r#"This command is a parser keyword. For details, check:
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https://www.nushell.sh/book/thinking_in_nu.html"#
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}
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fn is_parser_keyword(&self) -> bool {
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true
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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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Ok(PipelineData::empty())
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}
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fn examples(&self) -> Vec<Example> {
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vec![Example {
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description: "Write a signature for an external command",
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example: r#"extern-wrapped echo [text: string] { print $text }"#,
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result: None,
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}]
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}
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}
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@ -17,6 +17,7 @@ mod export_extern;
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mod export_module;
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mod export_use;
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mod extern_;
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mod extern_wrapped;
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mod for_;
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mod hide;
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mod hide_env;
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@ -55,6 +56,7 @@ pub use export_extern::ExportExtern;
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pub use export_module::ExportModule;
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pub use export_use::ExportUse;
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pub use extern_::Extern;
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pub use extern_wrapped::ExternWrapped;
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pub use for_::For;
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pub use hide::Hide;
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pub use hide_env::HideEnv;
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@ -35,6 +35,7 @@ pub fn create_default_context() -> EngineState {
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ExportUse,
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ExportModule,
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Extern,
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ExternWrapped,
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For,
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Hide,
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HideEnv,
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@ -158,8 +158,9 @@ fn def_with_paren_params() {
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#[test]
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fn extern_with_block() {
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let actual =
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nu!("extern foo [...rest] { print ($rest | str join ',' ) }; foo --bar baz -- -q -u -x");
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let actual = nu!(
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"extern-wrapped foo [...rest] { print ($rest | str join ',' ) }; foo --bar baz -- -q -u -x"
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);
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assert_eq!(actual.out, "--bar,baz,--,-q,-u,-x");
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}
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@ -1,4 +1,8 @@
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use crate::{parse_block, parser_path::ParserPath, type_check::type_compatible};
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use crate::{
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parse_block,
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parser_path::ParserPath,
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type_check::{check_block_input_output, type_compatible},
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};
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use itertools::Itertools;
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use log::trace;
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use nu_path::canonicalize_with;
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@ -43,6 +47,7 @@ pub const UNALIASABLE_PARSER_KEYWORDS: &[&[u8]] = &[
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b"export def",
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b"for",
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b"extern",
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b"extern-wrapped",
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b"export extern",
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b"alias",
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b"export alias",
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@ -181,7 +186,7 @@ pub fn parse_def_predecl(working_set: &mut StateWorkingSet, spans: &[Span]) {
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working_set.error(ParseError::DuplicateCommandDef(spans[1]));
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}
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}
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} else if decl_name == b"extern" && spans.len() >= 3 {
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} else if (decl_name == b"extern" || decl_name == b"extern-wrapped") && spans.len() >= 3 {
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let name_expr = parse_string(working_set, spans[1]);
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let name = name_expr.as_string();
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@ -485,19 +490,20 @@ pub fn parse_def(
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block.signature = signature;
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block.redirect_env = def_call == b"def-env";
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// Sadly we can't use this here as the inference would have to happen before
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// all the definitions had been fully parsed.
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// infer the return type based on the output of the block
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// let block = working_set.get_block(block_id);
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// let input_type = block.input_type(working_set);
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// let output_type = block.output_type();
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// block.signature.input_output_types = vec![(input_type, output_type)];
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if block.signature.input_output_types.is_empty() {
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block
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.signature
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.input_output_types
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.push((Type::Any, Type::Any));
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}
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let block = working_set.get_block(block_id);
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let typecheck_errors = check_block_input_output(working_set, block);
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working_set
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.parse_errors
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.extend_from_slice(&typecheck_errors);
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} else {
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working_set.error(ParseError::InternalError(
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"Predeclaration failed to add declaration".into(),
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@ -529,15 +535,17 @@ pub fn parse_extern(
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// Checking that the function is used with the correct name
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// Maybe this is not necessary but it is a sanity check
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let (name_span, split_id) =
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if spans.len() > 1 && working_set.get_span_contents(spans[0]) == b"export" {
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let (name_span, split_id) = if spans.len() > 1
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&& (working_set.get_span_contents(spans[0]) == b"export"
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|| working_set.get_span_contents(spans[0]) == b"export-wrapped")
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{
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(spans[1], 2)
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} else {
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(spans[0], 1)
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};
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let extern_call = working_set.get_span_contents(name_span).to_vec();
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if extern_call != b"extern" {
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if extern_call != b"extern" && extern_call != b"extern-wrapped" {
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working_set.error(ParseError::UnknownState(
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"internal error: Wrong call name for extern function".into(),
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span(spans),
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@ -932,7 +940,7 @@ pub fn parse_export_in_block(
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let full_name = if lite_command.parts.len() > 1 {
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let sub = working_set.get_span_contents(lite_command.parts[1]);
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match sub {
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b"alias" | b"def" | b"def-env" | b"extern" | b"use" | b"module" => {
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b"alias" | b"def" | b"def-env" | b"extern" | b"extern-wrapped" | b"use" | b"module" => {
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[b"export ", sub].concat()
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}
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_ => b"export".to_vec(),
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@ -1175,7 +1183,7 @@ pub fn parse_export_in_module(
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result
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}
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b"extern" => {
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b"extern" | b"extern-wrapped" => {
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let lite_command = LiteCommand {
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comments: lite_command.comments.clone(),
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parts: spans[1..].to_vec(),
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@ -1581,9 +1589,11 @@ pub fn parse_module_block(
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None, // using commands named as the module locally is OK
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))
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}
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b"extern" => block
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b"extern" | b"extern-wrapped" => {
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block
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.pipelines
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.push(parse_extern(working_set, command, None)),
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.push(parse_extern(working_set, command, None))
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}
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b"alias" => {
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block.pipelines.push(parse_alias(
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working_set,
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@ -682,6 +682,14 @@ pub fn parse_multispan_value(
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arg
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}
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SyntaxShape::Signature => {
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trace!("parsing: signature");
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let sig = parse_full_signature(working_set, &spans[*spans_idx..]);
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*spans_idx = spans.len() - 1;
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sig
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}
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SyntaxShape::Keyword(keyword, arg) => {
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trace!(
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"parsing: keyword({}) {:?}",
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@ -2932,36 +2940,7 @@ fn prepare_inner_span(
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}
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pub fn parse_type(working_set: &mut StateWorkingSet, bytes: &[u8], span: Span) -> Type {
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match bytes {
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b"binary" => Type::Binary,
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b"block" => {
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working_set.error(ParseError::LabeledErrorWithHelp {
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error: "Blocks are not support as first-class values".into(),
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label: "blocks are not supported as values".into(),
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help: "Use 'closure' instead of 'block'".into(),
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span,
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});
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Type::Any
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}
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b"bool" => Type::Bool,
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b"cellpath" => Type::CellPath,
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b"closure" => Type::Closure,
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b"date" => Type::Date,
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b"duration" => Type::Duration,
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b"error" => Type::Error,
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b"filesize" => Type::Filesize,
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b"float" | b"decimal" => Type::Float,
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b"int" => Type::Int,
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b"list" => Type::List(Box::new(Type::Any)),
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b"number" => Type::Number,
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b"range" => Type::Range,
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b"record" => Type::Record(vec![]),
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b"string" => Type::String,
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b"table" => Type::Table(vec![]), //FIXME
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_ => Type::Any,
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}
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parse_shape_name(working_set, bytes, span).to_type()
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}
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pub fn parse_import_pattern(working_set: &mut StateWorkingSet, spans: &[Span]) -> Expression {
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@ -3199,6 +3178,95 @@ pub fn expand_to_cell_path(
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}
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}
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pub fn parse_input_output_types(
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working_set: &mut StateWorkingSet,
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spans: &[Span],
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) -> Vec<(Type, Type)> {
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let mut full_span = span(spans);
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let mut bytes = working_set.get_span_contents(full_span);
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if bytes.starts_with(b"[") {
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bytes = &bytes[1..];
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full_span.start += 1;
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}
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if bytes.ends_with(b"]") {
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bytes = &bytes[..(bytes.len() - 1)];
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full_span.end -= 1;
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}
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let (tokens, parse_error) = lex(bytes, full_span.start, &[b','], &[], true);
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if let Some(parse_error) = parse_error {
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working_set.parse_errors.push(parse_error);
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}
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let mut output = vec![];
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let mut idx = 0;
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while idx < tokens.len() {
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let type_bytes = working_set.get_span_contents(tokens[idx].span).to_vec();
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let input_type = parse_type(working_set, &type_bytes, tokens[idx].span);
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idx += 1;
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if idx >= tokens.len() {
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working_set.error(ParseError::Expected(
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"arrow (->)",
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Span::new(tokens[idx - 1].span.end, tokens[idx - 1].span.end),
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));
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break;
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}
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let arrow = working_set.get_span_contents(tokens[idx].span);
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if arrow != b"->" {
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working_set.error(ParseError::Expected("arrow (->)", tokens[idx].span));
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}
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idx += 1;
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if idx >= tokens.len() {
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working_set.error(ParseError::MissingType(Span::new(
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tokens[idx - 1].span.end,
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tokens[idx - 1].span.end,
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)));
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break;
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}
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let type_bytes = working_set.get_span_contents(tokens[idx].span).to_vec();
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let output_type = parse_type(working_set, &type_bytes, tokens[idx].span);
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output.push((input_type, output_type));
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idx += 1;
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}
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output
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}
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pub fn parse_full_signature(working_set: &mut StateWorkingSet, spans: &[Span]) -> Expression {
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let arg_signature = working_set.get_span_contents(spans[0]);
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if arg_signature.ends_with(b":") {
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let mut arg_signature =
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parse_signature(working_set, Span::new(spans[0].start, spans[0].end - 1));
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let input_output_types = parse_input_output_types(working_set, &spans[1..]);
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if let Expression {
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expr: Expr::Signature(sig),
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span: expr_span,
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..
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} = &mut arg_signature
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{
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sig.input_output_types = input_output_types;
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expr_span.end = span(&spans[1..]).end;
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}
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arg_signature
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} else {
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parse_signature(working_set, spans[0])
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}
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}
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pub fn parse_row_condition(working_set: &mut StateWorkingSet, spans: &[Span]) -> Expression {
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let var_id = working_set.add_variable(b"$it".to_vec(), span(spans), Type::Any, false);
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let expression = parse_math_expression(working_set, spans, Some(var_id));
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@ -5026,8 +5094,8 @@ pub fn parse_expression(
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// For now, check for special parses of certain keywords
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match bytes.as_slice() {
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b"def" | b"extern" | b"for" | b"module" | b"use" | b"source" | b"alias" | b"export"
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| b"hide" => {
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b"def" | b"extern" | b"extern-wrapped" | b"for" | b"module" | b"use" | b"source"
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| b"alias" | b"export" | b"hide" => {
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working_set.error(ParseError::BuiltinCommandInPipeline(
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String::from_utf8(bytes)
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.expect("builtin commands bytes should be able to convert to string"),
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@ -5194,7 +5262,7 @@ pub fn parse_builtin_commands(
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match name {
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b"def" | b"def-env" => parse_def(working_set, lite_command, None),
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b"extern" => parse_extern(working_set, lite_command, None),
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b"extern" | b"extern-wrapped" => parse_extern(working_set, lite_command, None),
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b"let" => parse_let(working_set, &lite_command.parts),
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b"const" => parse_const(working_set, &lite_command.parts),
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b"mut" => parse_mut(working_set, &lite_command.parts),
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@ -5582,7 +5650,10 @@ pub fn parse_block(
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block.span = Some(span);
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type_check::check_block_input_output(working_set, &block);
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let errors = type_check::check_block_input_output(working_set, &block);
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if !errors.is_empty() {
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working_set.parse_errors.extend_from_slice(&errors);
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}
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block
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}
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@ -949,12 +949,14 @@ pub fn math_result_type(
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}
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pub fn check_pipeline_type(
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working_set: &mut StateWorkingSet,
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working_set: &StateWorkingSet,
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pipeline: &Pipeline,
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input_type: Type,
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) -> Type {
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) -> (Type, Option<Vec<ParseError>>) {
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let mut current_type = input_type;
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let mut output_errors: Option<Vec<ParseError>> = None;
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'elem: for elem in &pipeline.elements {
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match elem {
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PipelineElement::Expression(
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@ -997,7 +999,12 @@ pub fn check_pipeline_type(
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}
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if !decl.signature().input_output_types.is_empty() {
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working_set.error(ParseError::InputMismatch(current_type, call.head))
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if let Some(output_errors) = &mut output_errors {
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output_errors.push(ParseError::InputMismatch(current_type, call.head))
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} else {
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output_errors =
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Some(vec![ParseError::InputMismatch(current_type, call.head)]);
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}
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}
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current_type = Type::Any;
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}
|
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@ -1010,27 +1017,38 @@ pub fn check_pipeline_type(
|
||||
}
|
||||
}
|
||||
|
||||
current_type
|
||||
(current_type, output_errors)
|
||||
}
|
||||
|
||||
pub fn check_block_input_output(working_set: &mut StateWorkingSet, block: &Block) {
|
||||
pub fn check_block_input_output(working_set: &StateWorkingSet, block: &Block) -> Vec<ParseError> {
|
||||
// let inputs = block.input_types();
|
||||
let mut output_errors = vec![];
|
||||
|
||||
for (input_type, output_type) in &block.signature.input_output_types {
|
||||
let mut current_type = input_type.clone();
|
||||
let mut current_output_type = Type::Nothing;
|
||||
|
||||
for pipeline in &block.pipelines {
|
||||
current_output_type = check_pipeline_type(working_set, pipeline, current_type);
|
||||
let (checked_output_type, err) =
|
||||
check_pipeline_type(working_set, pipeline, current_type);
|
||||
current_output_type = checked_output_type;
|
||||
current_type = Type::Nothing;
|
||||
if let Some(err) = err {
|
||||
output_errors.extend_from_slice(&err);
|
||||
}
|
||||
}
|
||||
|
||||
if !type_compatible(output_type, ¤t_output_type)
|
||||
&& output_type != &Type::Any
|
||||
&& current_output_type != Type::Any
|
||||
{
|
||||
working_set.error(ParseError::OutputMismatch(
|
||||
output_type.clone(),
|
||||
let span = if block.pipelines.is_empty() {
|
||||
if let Some(span) = block.span {
|
||||
span
|
||||
} else {
|
||||
continue;
|
||||
}
|
||||
} else {
|
||||
block
|
||||
.pipelines
|
||||
.last()
|
||||
@ -1038,8 +1056,10 @@ pub fn check_block_input_output(working_set: &mut StateWorkingSet, block: &Block
|
||||
.elements
|
||||
.last()
|
||||
.expect("internal error: we should have elements")
|
||||
.span(),
|
||||
))
|
||||
.span()
|
||||
};
|
||||
|
||||
output_errors.push(ParseError::OutputMismatch(output_type.clone(), span))
|
||||
}
|
||||
}
|
||||
|
||||
@ -1047,8 +1067,14 @@ pub fn check_block_input_output(working_set: &mut StateWorkingSet, block: &Block
|
||||
let mut current_type = Type::Any;
|
||||
|
||||
for pipeline in &block.pipelines {
|
||||
let _ = check_pipeline_type(working_set, pipeline, current_type);
|
||||
let (_, err) = check_pipeline_type(working_set, pipeline, current_type);
|
||||
current_type = Type::Nothing;
|
||||
|
||||
if let Some(err) = err {
|
||||
output_errors.extend_from_slice(&err);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
output_errors
|
||||
}
|
||||
|
@ -576,3 +576,50 @@ fn filesize_is_not_hex() -> TestResult {
|
||||
fn let_variable_type_mismatch() -> TestResult {
|
||||
fail_test(r#"let x: int = "foo""#, "expected int, found string")
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn def_with_input_output_1() -> TestResult {
|
||||
run_test(r#"def foo []: nothing -> int { 3 }; foo"#, "3")
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn def_with_input_output_2() -> TestResult {
|
||||
run_test(
|
||||
r#"def foo []: [int -> int, string -> int] { 3 }; 10 | foo"#,
|
||||
"3",
|
||||
)
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn def_with_input_output_3() -> TestResult {
|
||||
run_test(
|
||||
r#"def foo []: [int -> int, string -> int] { 3 }; "bob" | foo"#,
|
||||
"3",
|
||||
)
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn def_with_input_output_mismatch_1() -> TestResult {
|
||||
fail_test(
|
||||
r#"def foo []: [int -> int, string -> int] { 3 }; foo"#,
|
||||
"command doesn't support",
|
||||
)
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn def_with_input_output_mismatch_2() -> TestResult {
|
||||
fail_test(
|
||||
r#"def foo []: [int -> int, string -> int] { 3 }; {x: 2} | foo"#,
|
||||
"command doesn't support",
|
||||
)
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn def_with_input_output_broken_1() -> TestResult {
|
||||
fail_test(r#"def foo []: int { 3 }"#, "expected arrow")
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn def_with_input_output_broken_2() -> TestResult {
|
||||
fail_test(r#"def foo []: int -> { 3 }"#, "expected type")
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user