Struct Scope 

pub struct Scope<'a, R> { /* private fields */ }

Where an expression is evaluated: the row, its parent, the rows aggregates run over, and the page.

Implementations

impl<'a, R: Record> Scope<'a, R>

pub fn new(env: &'a Environment) -> Self

A scope with no row.

pub fn row(self, row: &'a R) -> Self

The current row.

pub fn maybe_row(self, row: Option<&'a R>) -> Self

Sets or clears the current row.

pub fn parent(self, parent: Option<&'a R>) -> Self

The parent row, read as [^.Field].

pub fn rows(self, rows: &'a [&'a R]) -> Self

The rows aggregates run over (a group, a page, a whole list).

pub fn position(self, position: Option<usize>) -> Self

The current row’s index in Self::rows, for running aggregates.

pub fn page(self, number: usize, count: usize) -> Self

The page number and page count, for PageNumber() and PageCount().

pub fn current_row(&self) -> Option<&'a R>

The current row, if there is one.

pub fn current_rows(&self) -> &'a [&'a R]

The rows aggregates run over.

pub fn evaluate(&self, criteria: &Criteria) -> Result<Value, EvalError>

Evaluates criteria.

pub fn matches(&self, criteria: &Criteria) -> bool

Evaluates a filter: true when it holds; errors count as false.

Trait Implementations

impl<R> Clone for Scope<'_, R>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<R> Copy for Scope<'_, R>

impl<R> Debug for Scope<'_, R>

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

Formats the value using the given formatter.