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38 lines
682 B
38 lines
682 B
package analysis
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import (
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"go/ast"
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"go/token"
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"go/types"
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)
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func HasSideEffect(n ast.Node, info *types.Info) bool {
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v := hasSideEffectVisitor{info: info}
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ast.Walk(&v, n)
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return v.hasSideEffect
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}
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type hasSideEffectVisitor struct {
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info *types.Info
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hasSideEffect bool
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}
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func (v *hasSideEffectVisitor) Visit(node ast.Node) (w ast.Visitor) {
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if v.hasSideEffect {
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return nil
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}
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switch n := node.(type) {
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case *ast.CallExpr:
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if _, isSig := v.info.TypeOf(n.Fun).(*types.Signature); isSig { // skip conversions
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v.hasSideEffect = true
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return nil
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}
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case *ast.UnaryExpr:
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if n.Op == token.ARROW {
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v.hasSideEffect = true
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return nil
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}
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}
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return v
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}
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