61 lines
2.6 KiB
Go
61 lines
2.6 KiB
Go
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/*
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Copyright 2019 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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// Package loader defines helpers for loading packages from sources. It wraps
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// go/packages, allow incremental loading of source code and manual control
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// over which packages get type-checked. This allows for faster loading in
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// cases where you don't actually care about certain imports.
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//
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// Because it uses go/packages, it's modules-aware, and works in both modules-
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// and non-modules environments.
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//
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// Loading
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//
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// The main entrypoint for loading is LoadRoots, which traverse the package
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// graph starting at the given patterns (file, package, path, or ...-wildcard,
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// as one might pass to go list). Packages beyond the roots can be accessed
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// via the Imports() method. Packages are initially loaded with export data
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// paths, filenames, and imports.
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//
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// Packages are suitable for comparison, as each unique package only ever has
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// one *Package object returned.
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//
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// Syntax and TypeChecking
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//
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// ASTs and type-checking information can be loaded with NeedSyntax and
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// NeedTypesInfo, respectively. Both are idempotent -- repeated calls will
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// simply re-use the cached contents. Note that NeedTypesInfo will *only* type
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// check the current package -- if you want to type-check imports as well,
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// you'll need to type-check them first.
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//
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// Reference Pruning and Recursive Checking
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//
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// In order to type-check using only the packages you care about, you can use a
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// TypeChecker. TypeChecker will visit each top-level type declaration,
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// collect (optionally filtered) references, and type-check references
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// packages.
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//
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// Errors
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//
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// Errors can be added to each package. Use ErrFromNode to create an error
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// from an AST node. Errors can then be printed (complete with file and
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// position information) using PrintErrors, optionally filtered by error type.
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// It's generally a good idea to filter out TypeErrors when doing incomplete
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// type-checking with TypeChecker. You can use MaybeErrList to return multiple
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// errors if you need to return an error instead of adding it to a package.
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// AddError will later unroll it into individual errors.
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package loader
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