Struct ExpressionReferences

pub struct ExpressionReferences<'expr> { /* private fields */ }

A collection of all the references that an expression makes to variables and functions.

Implementations

impl ExpressionReferences<'_>

pub fn has_variable(&self, name: impl AsRef<str>) -> bool

Returns true if the expression references the provided variable name.

Example

let expression = Parser::new().parse("foo.bar == true").unwrap();
let references = expression.references();
assert!(references.has_variable("foo"));

pub fn has_function(&self, name: impl AsRef<str>) -> bool

Returns true if the expression references the provided function name.

Example

let expression = Parser::new().parse("size(foo) > 0").unwrap();
let references = expression.references();
assert!(references.has_function("size"));

pub fn variables(&self) -> Vec<&str>

Returns a list of all variables referenced in the expression.

Example

let expression = Parser::new().parse("foo.bar == true").unwrap();
let references = expression.references();
assert_eq!(vec!["foo"], references.variables());

pub fn functions(&self) -> Vec<&str>

Returns a list of all functions referenced in the expression.

Example

let expression = Parser::new().parse("size(foo) > 0").unwrap();
let references = expression.references();
assert!(references.functions().contains(&"_>_"));
assert!(references.functions().contains(&"size"));