Enum Part 

pub enum Part {
    All,
    Flatten,
    Last,
    First,
    Field(Strand),
    Where(Expr),
    Lookup(Box<Lookup>),
    Value(Expr),
    Start(Expr),
    Method(Strand, Vec<Expr>),
    Destructure(Vec<DestructurePart>),
    Optional,
    Recurse(Recurse, Option<Idiom>, Option<RecurseInstruction>),
    Doc,
    RepeatRecurse,
}

Variants

All

Flatten

Last

First

Field(Strand)

Where(Expr)

Lookup(Box<Lookup>)

Value(Expr)

Start(Expr)

TODO: Remove, start and move it out of part to eliminate invalid state.

Method(Strand, Vec<Expr>)

Destructure(Vec<DestructurePart>)

Optional

Recurse(Recurse, Option<Idiom>, Option<RecurseInstruction>)

Doc

RepeatRecurse

Implementations

impl Part

pub fn index_int(idx: i64) -> Self

Returns a part which is equivalent to [1] if called with integer 1.

pub fn is_index(&self) -> bool

pub fn as_old_index(&self) -> Option<usize>

Returns the idex if this part would have been Part::Index(x) before that field was removed.

TODO: Remove this method once we work out the kinks with removing Part::Index(x) and only having Part::Value(x)

Already marked as deprecated for the full release to remind that this behavior should be fixed.

pub fn read_only(&self) -> bool

Whether evaluating this part can be done on a read-only transaction.

Matched exhaustively on purpose: a new variant that carries an expression must be classified here rather than defaulting to read-only, which would let a mutation reach a read-only transaction.

pub fn alias(&self) -> Option<&Idiom>

Returns a yield if an alias is specified

pub fn to_raw_string(&self) -> String

Trait Implementations

impl Clone for Part

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Part

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

Formats the value using the given formatter.

impl Eq for Part

impl From<Part> for Part

fn from(v: Part) -> Self

Converts to this type from the input type.

impl From<Part> for Part

fn from(v: Part) -> Self

Converts to this type from the input type.

impl Hash for Part

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Part

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for Part

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for Part

impl ToSql for Part

fn fmt_sql(&self, f: &mut String, fmt: SqlFormat)

Format the type to a SQL string.

fn to_sql(&self) -> String

Convert the type to a SQL string.

fn to_sql_pretty(&self) -> String

Convert the type to a pretty-printed SQL string with indentation.

impl<V: Visitor> Visit<V> for Part

fn visit(&self, this: &mut V) -> Result<(), V::Error>

impl<V: MutVisitor> VisitMut<V> for Part

fn visit_mut(&mut self, this: &mut V) -> Result<(), V::Error>