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59 lines
1.5 KiB
Go
59 lines
1.5 KiB
Go
// Package lintdsl provides helpers for implementing static analysis
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// checks. Dot-importing this package is encouraged.
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package lintdsl
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import (
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"bytes"
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"fmt"
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"go/ast"
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"go/format"
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"golang.org/x/tools/go/analysis"
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"honnef.co/go/tools/pattern"
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)
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func Inspect(node ast.Node, fn func(node ast.Node) bool) {
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if node == nil {
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return
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}
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ast.Inspect(node, fn)
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}
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func Match(pass *analysis.Pass, q pattern.Pattern, node ast.Node) (*pattern.Matcher, bool) {
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// Note that we ignore q.Relevant – callers of Match usually use
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// AST inspectors that already filter on nodes we're interested
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// in.
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m := &pattern.Matcher{TypesInfo: pass.TypesInfo}
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ok := m.Match(q.Root, node)
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return m, ok
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}
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func MatchAndEdit(pass *analysis.Pass, before, after pattern.Pattern, node ast.Node) (*pattern.Matcher, []analysis.TextEdit, bool) {
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m, ok := Match(pass, before, node)
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if !ok {
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return m, nil, false
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}
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r := pattern.NodeToAST(after.Root, m.State)
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buf := &bytes.Buffer{}
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format.Node(buf, pass.Fset, r)
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edit := []analysis.TextEdit{{
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Pos: node.Pos(),
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End: node.End(),
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NewText: buf.Bytes(),
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}}
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return m, edit, true
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}
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func Selector(x, sel string) *ast.SelectorExpr {
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return &ast.SelectorExpr{
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X: &ast.Ident{Name: x},
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Sel: &ast.Ident{Name: sel},
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}
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}
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// ExhaustiveTypeSwitch panics when called. It can be used to ensure
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// that type switches are exhaustive.
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func ExhaustiveTypeSwitch(v interface{}) {
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panic(fmt.Sprintf("internal error: unhandled case %T", v))
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}
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