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Forbid reserved variable names for function arguments (#11169)
Works for all arguments and flags. Because the signature parsing doesn't give the spans, it is flags the entire signature. Also added a constant with reserved variable names. Fix #11158.
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@ -40,6 +40,8 @@ use crate::{
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/// These parser keywords can be aliased
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pub const ALIASABLE_PARSER_KEYWORDS: &[&[u8]] = &[b"overlay hide", b"overlay new", b"overlay use"];
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pub const RESERVED_VARIABLE_NAMES: [&str; 3] = ["in", "nu", "env"];
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/// These parser keywords cannot be aliased (either not possible, or support not yet added)
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pub const UNALIASABLE_PARSER_KEYWORDS: &[&[u8]] = &[
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b"export",
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@ -350,6 +352,13 @@ pub fn parse_for(working_set: &mut StateWorkingSet, spans: &[Span]) -> Expressio
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}
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}
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/// If `name` is a keyword, emit an error.
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fn verify_not_reserved_variable_name(working_set: &mut StateWorkingSet, name: &str, span: Span) {
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if RESERVED_VARIABLE_NAMES.contains(&name) {
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working_set.error(ParseError::NameIsBuiltinVar(name.to_string(), span))
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}
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}
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// Returns also the parsed command name and ID
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pub fn parse_def(
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working_set: &mut StateWorkingSet,
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@ -515,6 +524,19 @@ pub fn parse_def(
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let mut result = None;
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if let (Some(mut signature), Some(block_id)) = (sig.as_signature(), block.as_block()) {
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for arg_name in &signature.required_positional {
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verify_not_reserved_variable_name(working_set, &arg_name.name, sig.span);
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}
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for arg_name in &signature.optional_positional {
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verify_not_reserved_variable_name(working_set, &arg_name.name, sig.span);
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}
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for arg_name in &signature.rest_positional {
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verify_not_reserved_variable_name(working_set, &arg_name.name, sig.span);
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}
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for flag_name in &signature.get_names() {
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verify_not_reserved_variable_name(working_set, flag_name, sig.span);
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}
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if has_wrapped {
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if let Some(rest) = &signature.rest_positional {
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if let Some(var_id) = rest.var_id {
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@ -2997,7 +3019,7 @@ pub fn parse_let(working_set: &mut StateWorkingSet, spans: &[Span]) -> Pipeline
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.trim_start_matches('$')
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.to_string();
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if ["in", "nu", "env"].contains(&var_name.as_str()) {
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if RESERVED_VARIABLE_NAMES.contains(&var_name.as_str()) {
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working_set.error(ParseError::NameIsBuiltinVar(var_name, lvalue.span))
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}
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@ -3104,8 +3126,7 @@ pub fn parse_const(working_set: &mut StateWorkingSet, spans: &[Span]) -> Pipelin
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.trim_start_matches('$')
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.to_string();
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// TODO: Remove the hard-coded variables, too error-prone
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if ["in", "nu", "env"].contains(&var_name.as_str()) {
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if RESERVED_VARIABLE_NAMES.contains(&var_name.as_str()) {
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working_set.error(ParseError::NameIsBuiltinVar(var_name, lvalue.span))
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}
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@ -3246,7 +3267,7 @@ pub fn parse_mut(working_set: &mut StateWorkingSet, spans: &[Span]) -> Pipeline
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.trim_start_matches('$')
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.to_string();
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if ["in", "nu", "env"].contains(&var_name.as_str()) {
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if RESERVED_VARIABLE_NAMES.contains(&var_name.as_str()) {
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working_set.error(ParseError::NameIsBuiltinVar(var_name, lvalue.span))
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}
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@ -304,6 +304,21 @@ fn parse_function_signature(#[case] phrase: &str) {
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assert!(actual.err.is_empty());
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}
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#[rstest]
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#[case("def test [ in ] {}")]
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#[case("def test [ in: string ] {}")]
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#[case("def test [ nu: int ] {}")]
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#[case("def test [ env: record<> ] {}")]
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#[case("def test [ --env ] {}")]
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#[case("def test [ --nu: int ] {}")]
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#[case("def test [ --in (-i): list<any> ] {}")]
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#[case("def test [ a: string, b: int, in: table<a: int b: int> ] {}")]
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#[case("def test [ env, in, nu ] {}")]
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fn parse_function_signature_name_is_builtin_var(#[case] phrase: &str) {
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let actual = nu!(phrase);
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assert!(actual.err.contains("nu::parser::name_is_builtin_var"))
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}
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#[rstest]
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#[case("let a: int = 1")]
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#[case("let a: string = 'qwe'")]
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