Struct pica_record::matcher::subfield::RelationMatcher

pub struct RelationMatcher { /* private fields */ }

A matcher that checks relations between (string) values.

Implementations

impl RelationMatcher

pub fn new(matcher: &str) -> Result<Self, ParseMatcherError>

Creates a new RelationMatcher.

Errors

This function fails if the given expression is not a valid relation matcher.

Example

use pica_record::matcher::subfield::RelationMatcher;

let _matcher = RelationMatcher::new("0 == 'Tp1'")?;

pub fn is_match<'a>( &self, subfields: impl IntoIterator<Item = &'a SubfieldRef<'a>>, options: &MatcherOptions, ) -> bool

Returns true if at least one subfield is found, when the subfield’s value and the matcher value are related. The two values are related iff the relation defined by the operator exists.

Example

use pica_record::matcher::subfield::RelationMatcher;
use pica_record::matcher::MatcherOptions;
use pica_record::primitives::SubfieldRef;

let options = MatcherOptions::default();
let matcher = RelationMatcher::new("0 == 'Tp1'")?;
let subfield = SubfieldRef::new('0', "Tp1")?;
assert!(matcher.is_match(&subfield, &options));

Trait Implementations

impl Clone for RelationMatcher

fn clone(&self) -> RelationMatcher

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for RelationMatcher

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

Formats the value using the given formatter.

impl Display for RelationMatcher

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

Format the relation matcher as a human-readable string.

Example

use pica_record::matcher::subfield::RelationMatcher;
use pica_record::matcher::MatcherOptions;
use pica_record::primitives::SubfieldRef;

let matcher = RelationMatcher::new("[a0-3] == 'foo'")?;
assert_eq!(matcher.to_string(), "[a0-3] == 'foo'");

impl PartialEq for RelationMatcher

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl Eq for RelationMatcher

impl StructuralPartialEq for RelationMatcher