Enum yash_syntax::source::Source

#[non_exhaustive]
pub enum Source {
    Unknown,
    Stdin,
    Alias {
        original: Location,
        alias: Rc<Alias>,
    },
    CommandSubst {
        original: Location,
    },
    Arith {
        original: Location,
    },
    Trap {
        condition: String,
        origin: Location,
    },
}

Origin of source code.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Unknown

Source code of unknown origin.

Normally you should not use this value, but it may be useful for quick debugging.

Stdin

Standard input.

Alias

Fields

original: Location

Position of the original word that was replaced

alias: Rc<Alias>

Definition of the alias that was substituted

Alias substitution.

This applies to a code fragment that replaced another as a result of alias substitution.

CommandSubst

Fields

original: Location

Command substitution.

Arith

Fields

original: Location

Arithmetic expansion.

Trap

Fields

condition: String

Trap condition name, typically the signal name.

origin: Location

Location of the simple command that has set this trap command.

Trap command.

Implementations

impl Source

pub fn complement_annotations<'a, 's: 'a, T: Extend<Annotation<'a>>>( &'s self, result: &mut T )

Appends complementary annotations describing this source.

impl Source

pub fn is_alias_for(&self, name: &str) -> bool

Tests if this source is alias substitution for the given name.

Returns true if self is Source::Alias with the name or such an original, recursively.

// `is_alias_for` returns false for sources other than an Alias
assert_eq!(Source::Unknown.is_alias_for("foo"), false);

// `is_alias_for` returns true if the names match
let original = Location::dummy("");
let alias = std::rc::Rc::new(yash_syntax::alias::Alias{
    name: "foo".to_string(),
    replacement: "".to_string(),
    global: false,
    origin: original.clone()
});
let source = Source::Alias{original, alias};
assert_eq!(source.is_alias_for("foo"), true);
assert_eq!(source.is_alias_for("bar"), false);

// `is_alias_for` checks aliases recursively.
let mut original = Location::dummy("");
let alias = Rc::new(yash_syntax::alias::Alias{
    name: "foo".to_string(),
    replacement: "".to_string(),
    global: false,
    origin: original.clone()
});
let source = Source::Alias{original: original.clone(), alias};
let alias = Rc::new(yash_syntax::alias::Alias{
    name: "bar".to_string(),
    replacement: "".to_string(),
    global: false,
    origin: original.clone()
});
Rc::make_mut(&mut original.code).source = source;
let source = Source::Alias{original, alias};
assert_eq!(source.is_alias_for("foo"), true);
assert_eq!(source.is_alias_for("bar"), true);
assert_eq!(source.is_alias_for("baz"), false);

pub fn label(&self) -> &str

Returns a label that describes the source.

Trait Implementations

impl Clone for Source

fn clone(&self) -> Source

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Source

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq<Source> for Source

fn eq(&self, other: &Source) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for Source

impl StructuralEq for Source

impl StructuralPartialEq for Source