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59 lines
2.3 KiB
Go
59 lines
2.3 KiB
Go
// Copyright 2018 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package functions defines the standard builtin functions supported by the
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// interpreter and as declared within the checker#StandardDeclarations.
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package functions
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import "github.com/google/cel-go/common/types/ref"
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// Overload defines a named overload of a function, indicating an operand trait
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// which must be present on the first argument to the overload as well as one
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// of either a unary, binary, or function implementation.
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//
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// The majority of operators within the expression language are unary or binary
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// and the specializations simplify the call contract for implementers of
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// types with operator overloads. Any added complexity is assumed to be handled
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// by the generic FunctionOp.
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type Overload struct {
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// Operator name as written in an expression or defined within
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// operators.go.
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Operator string
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// Operand trait used to dispatch the call. The zero-value indicates a
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// global function overload or that one of the Unary / Binary / Function
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// definitions should be used to execute the call.
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OperandTrait int
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// Unary defines the overload with a UnaryOp implementation. May be nil.
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Unary UnaryOp
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// Binary defines the overload with a BinaryOp implementation. May be nil.
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Binary BinaryOp
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// Function defines the overload with a FunctionOp implementation. May be
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// nil.
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Function FunctionOp
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}
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// UnaryOp is a function that takes a single value and produces an output.
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type UnaryOp func(value ref.Val) ref.Val
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// BinaryOp is a function that takes two values and produces an output.
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type BinaryOp func(lhs ref.Val, rhs ref.Val) ref.Val
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// FunctionOp is a function with accepts zero or more arguments and produces
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// an value (as interface{}) or error as a result.
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type FunctionOp func(values ...ref.Val) ref.Val
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