A comprehension expression applied to a list or map. Comprehensions are not part of the core syntax, but enabled with macros. A macro matches a specific call signature within a parsed AST and replaces the call with an alternate AST block. Macro expansion happens at parse time. The following macros are supported within CEL: Aggregate type macros may be applied to all elements in a list or all keys in a map: * all, exists, exists_one - test a predicate expression against the inputs and return true if the predicate is satisfied for all, any, or only one value list.all(x, x < 10). * filter - test a predicate expression against the inputs and return the subset of elements which satisfy the predicate: payments.filter(p, p > 1000). * map - apply an expression to all elements in the input and return the output aggregate type: [1, 2, 3].map(i, i * i). The has(m.x) macro tests whether the property x is present in struct m. The semantics of this macro depend on the type of m. For proto2 messages has(m.x) is defined as 'defined, but not set. For proto3, the macro tests whether the property is set to its default. For map and struct types, the macro tests whether the property xis defined onm`.
| Name | Type | Description | Notes |
|---|---|---|---|
| iterVar | String | The name of the iteration variable. | [optional] |
| iterRange | Expr | [optional] | |
| accuVar | String | The name of the variable used for accumulation of the result. | [optional] |
| accuInit | Expr | [optional] | |
| loopCondition | Expr | [optional] | |
| loopStep | Expr | [optional] | |
| result | Expr | [optional] |