Struct ForExpr 

#[non_exhaustive]
pub struct ForExpr {
    pub binders: Vec<Arc<str>>,
    pub collection: Box<Expression>,
    pub key: Option<Box<Expression>>,
    pub value: Box<Expression>,
    pub cond: Option<Box<Expression>>,
    pub object_form: bool,
    pub span: Span,
}

An HCL for comprehension — captured verbatim when the evaluator cannot reduce it (typically because the source collection is unresolved).

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

binders: Vec<Arc<str>>

Iteration variable name(s): [key, value] if a key was bound, else [value].

collection: Box<Expression>

Source collection.

key: Option<Box<Expression>>

Yielded key expression (object form only).

value: Box<Expression>

Yielded value expression.

cond: Option<Box<Expression>>

Optional if clause.

object_form: bool

Whether this is an object comprehension ({...}) vs. a list one ([...]).

span: Span

Span.

Implementations

impl ForExpr

pub fn builder() -> ForExprBuilder<((), (), (), (), (), (), ())>

Create a builder for building ForExpr. On the builder, call .binders(...), .collection(...), .key(...)(optional), .value(...), .cond(...)(optional), .object_form(...)(optional), .span(...) to set the values of the fields. Finally, call .build() to create the instance of ForExpr.

Trait Implementations

impl Clone for ForExpr

fn clone(&self) -> ForExpr

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ForExpr

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ForExpr

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for ForExpr

fn eq(&self, other: &ForExpr) -> 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 Serialize for ForExpr

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for ForExpr