yq/pkg/yqlib/operator_subtract.go

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package yqlib
import (
"fmt"
"strconv"
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"strings"
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"gopkg.in/yaml.v3"
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)
func createSubtractOp(lhs *ExpressionNode, rhs *ExpressionNode) *ExpressionNode {
return &ExpressionNode{Operation: &Operation{OperationType: subtractOpType},
Lhs: lhs,
Rhs: rhs}
}
func subtractAssignOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
return compoundAssignFunction(d, context, expressionNode, createSubtractOp)
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}
func subtractOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
log.Debugf("Subtract operator")
return crossFunction(d, context.ReadOnlyClone(), expressionNode, subtract, false)
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}
func subtractArray(lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
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newLhsArray := make([]*yaml.Node, 0)
for lindex := 0; lindex < len(lhs.Node.Content); lindex = lindex + 1 {
shouldInclude := true
for rindex := 0; rindex < len(rhs.Node.Content) && shouldInclude; rindex = rindex + 1 {
if recursiveNodeEqual(lhs.Node.Content[lindex], rhs.Node.Content[rindex]) {
shouldInclude = false
}
}
if shouldInclude {
newLhsArray = append(newLhsArray, lhs.Node.Content[lindex])
}
}
lhs.Node.Content = newLhsArray
return lhs, nil
}
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func subtract(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
lhs.Node = unwrapDoc(lhs.Node)
rhs.Node = unwrapDoc(rhs.Node)
lhsNode := lhs.Node
if lhsNode.Tag == "!!null" {
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return lhs.CreateReplacement(rhs.Node), nil
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}
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target := lhs.CreateReplacement(&yaml.Node{})
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switch lhsNode.Kind {
case yaml.MappingNode:
return nil, fmt.Errorf("Maps not yet supported for subtraction")
case yaml.SequenceNode:
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if rhs.Node.Kind != yaml.SequenceNode {
return nil, fmt.Errorf("%v (%v) cannot be subtracted from %v", rhs.Node.Tag, rhs.Path, lhsNode.Tag)
}
return subtractArray(lhs, rhs)
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case yaml.ScalarNode:
if rhs.Node.Kind != yaml.ScalarNode {
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return nil, fmt.Errorf("%v (%v) cannot be subtracted from %v", rhs.Node.Tag, rhs.Path, lhsNode.Tag)
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}
target.Node.Kind = yaml.ScalarNode
target.Node.Style = lhsNode.Style
return subtractScalars(target, lhsNode, rhs.Node)
}
return target, nil
}
func subtractScalars(target *CandidateNode, lhs *yaml.Node, rhs *yaml.Node) (*CandidateNode, error) {
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lhsTag := lhs.Tag
rhsTag := rhs.Tag
lhsIsCustom := false
if !strings.HasPrefix(lhsTag, "!!") {
// custom tag - we have to have a guess
lhsTag = guessTagFromCustomType(lhs)
lhsIsCustom = true
}
if !strings.HasPrefix(rhsTag, "!!") {
// custom tag - we have to have a guess
rhsTag = guessTagFromCustomType(rhs)
}
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if lhsTag == "!!str" {
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return nil, fmt.Errorf("strings cannot be subtracted")
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} else if lhsTag == "!!int" && rhsTag == "!!int" {
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format, lhsNum, err := parseInt(lhs.Value)
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if err != nil {
return nil, err
}
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_, rhsNum, err := parseInt(rhs.Value)
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if err != nil {
return nil, err
}
result := lhsNum - rhsNum
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target.Node.Tag = lhs.Tag
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target.Node.Value = fmt.Sprintf(format, result)
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} else if (lhsTag == "!!int" || lhsTag == "!!float") && (rhsTag == "!!int" || rhsTag == "!!float") {
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lhsNum, err := strconv.ParseFloat(lhs.Value, 64)
if err != nil {
return nil, err
}
rhsNum, err := strconv.ParseFloat(rhs.Value, 64)
if err != nil {
return nil, err
}
result := lhsNum - rhsNum
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if lhsIsCustom {
target.Node.Tag = lhs.Tag
} else {
target.Node.Tag = "!!float"
}
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target.Node.Value = fmt.Sprintf("%v", result)
} else {
return nil, fmt.Errorf("%v cannot be added to %v", lhs.Tag, rhs.Tag)
}
return target, nil
}