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package source
import (
"go/ast"
"go/token"
"github.com/pkg/errors"
)
func scanToDeferLine(fileset *token.FileSet, node ast.Node, lineNum int) ast.Node {
var matchedNode ast.Node
ast.Inspect(node, func(node ast.Node) bool {
switch {
case node == nil || matchedNode != nil:
return false
case fileset.Position(node.End()).Line == lineNum:
if funcLit, ok := node.(*ast.FuncLit); ok {
matchedNode = funcLit
return false
}
}
return true
})
debug("defer line node: %s", debugFormatNode{matchedNode})
return matchedNode
}
func guessDefer(node ast.Node) (ast.Node, error) {
defers := collectDefers(node)
switch len(defers) {
case 0:
return nil, errors.New("failed to expression in defer")
case 1:
return defers[0].Call, nil
default:
return nil, errors.Errorf(
"ambiguous call expression: multiple (%d) defers in call block",
len(defers))
}
}
func collectDefers(node ast.Node) []*ast.DeferStmt {
var defers []*ast.DeferStmt
ast.Inspect(node, func(node ast.Node) bool {
if d, ok := node.(*ast.DeferStmt); ok {
defers = append(defers, d)
debug("defer: %s", debugFormatNode{d})
return false
}
return true
})
return defers
}
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