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78 lines
2.7 KiB
Go
78 lines
2.7 KiB
Go
// Copyright 2020 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 cel
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import (
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"github.com/google/cel-go/checker"
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"github.com/google/cel-go/interpreter/functions"
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"github.com/google/cel-go/parser"
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)
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// Library provides a collection of EnvOption and ProgramOption values used to confiugre a CEL
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// environment for a particular use case or with a related set of functionality.
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//
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// Note, the ProgramOption values provided by a library are expected to be static and not vary
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// between calls to Env.Program(). If there is a need for such dynamic configuration, prefer to
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// configure these options outside the Library and within the Env.Program() call directly.
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type Library interface {
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// CompileOptions returns a collection of funcitional options for configuring the Parse / Check
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// environment.
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CompileOptions() []EnvOption
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// ProgramOptions returns a collection of functional options which should be included in every
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// Program generated from the Env.Program() call.
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ProgramOptions() []ProgramOption
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}
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// Lib creates an EnvOption out of a Library, allowing libraries to be provided as functional args,
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// and to be linked to each other.
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func Lib(l Library) EnvOption {
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return func(e *Env) (*Env, error) {
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var err error
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for _, opt := range l.CompileOptions() {
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e, err = opt(e)
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if err != nil {
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return nil, err
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}
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}
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e.progOpts = append(e.progOpts, l.ProgramOptions()...)
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return e, nil
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}
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}
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// StdLib returns an EnvOption for the standard library of CEL functions and macros.
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func StdLib() EnvOption {
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return Lib(stdLibrary{})
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}
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// stdLibrary implements the Library interface and provides functional options for the core CEL
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// features documented in the specification.
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type stdLibrary struct{}
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// EnvOptions returns options for the standard CEL function declarations and macros.
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func (stdLibrary) CompileOptions() []EnvOption {
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return []EnvOption{
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Declarations(checker.StandardDeclarations()...),
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Macros(parser.AllMacros...),
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}
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}
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// ProgramOptions returns function implementations for the standard CEL functions.
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func (stdLibrary) ProgramOptions() []ProgramOption {
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return []ProgramOption{
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Functions(functions.StandardOverloads()...),
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}
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}
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