mirror of https://github.com/mikefarah/yq.git
60 lines
1.7 KiB
Go
60 lines
1.7 KiB
Go
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package yqlib
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import (
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"container/list"
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"fmt"
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)
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func reduceOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
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log.Debugf("-- reduceOp")
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//.a as $var reduce (0; . + $var)
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//lhs is the assignment operator
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//rhs is the reduce block
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// '.' refers to the current accumulator, initialised to 0
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// $var references a single element from the .a
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//ensure lhs is actually an assignment
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//and rhs is a block (empty)
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if expressionNode.Lhs.Operation.OperationType != assignVariableOpType {
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return Context{}, fmt.Errorf("reduce must be given a variables assignment, got %v instead", expressionNode.Lhs.Operation.OperationType.Type)
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} else if expressionNode.Rhs.Operation.OperationType != blockOpType {
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return Context{}, fmt.Errorf("reduce must be given a block, got %v instead", expressionNode.Rhs.Operation.OperationType.Type)
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}
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arrayExpNode := expressionNode.Lhs.Lhs
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array, err := d.GetMatchingNodes(context, arrayExpNode)
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log.Debugf("array of %v things", array.MatchingNodes.Len())
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if err != nil {
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return Context{}, err
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}
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variableName := expressionNode.Lhs.Rhs.Operation.StringValue
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initExp := expressionNode.Rhs.Lhs
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accum, err := d.GetMatchingNodes(context, initExp)
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if err != nil {
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return Context{}, err
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}
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log.Debugf("with variable %v", variableName)
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blockExp := expressionNode.Rhs.Rhs
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for el := array.MatchingNodes.Front(); el != nil; el = el.Next() {
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candidate := el.Value.(*CandidateNode)
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log.Debugf("REDUCING WITH %v", NodeToString(candidate))
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l := list.New()
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l.PushBack(candidate)
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accum.SetVariable(variableName, l)
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accum, err = d.GetMatchingNodes(accum, blockExp)
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if err != nil {
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return Context{}, err
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}
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}
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return accum, nil
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}
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