38 lines
1.0 KiB
Go
38 lines
1.0 KiB
Go
package lintutil
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import (
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"go/ast"
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"go/types"
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)
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// TODO: this package is a way to reuse code between lint and astwalk.
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// Would be good to find it a better name.
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// IsTypeExpr reports whether x represents type expression.
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//
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// Type expression does not evaluate to any run time value,
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// but rather describes type that is used inside Go expression.
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// For example, (*T)(v) is a CallExpr that "calls" (*T).
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// (*T) is a type expression that tells Go compiler type v should be converted to.
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func IsTypeExpr(info *types.Info, x ast.Expr) bool {
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switch x := x.(type) {
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case *ast.StarExpr:
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return IsTypeExpr(info, x.X)
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case *ast.ParenExpr:
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return IsTypeExpr(info, x.X)
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case *ast.SelectorExpr:
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return IsTypeExpr(info, x.Sel)
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case *ast.Ident:
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// Identifier may be a type expression if object
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// it reffers to is a type name.
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_, ok := info.ObjectOf(x).(*types.TypeName)
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return ok
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case *ast.FuncType, *ast.StructType, *ast.InterfaceType, *ast.ArrayType, *ast.MapType:
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return true
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default:
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return false
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}
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}
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