mirror of https://github.com/mikefarah/yq.git
98 lines
3.1 KiB
Go
98 lines
3.1 KiB
Go
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 getVariableOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
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variableName := expressionNode.Operation.StringValue
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log.Debug("getVariableOperator %v", variableName)
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result := context.GetVariable(variableName)
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if result == nil {
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result = list.New()
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}
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return context.ChildContext(result), nil
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}
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type assignVarPreferences struct {
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IsReference bool
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}
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func useWithPipe(d *dataTreeNavigator, context Context, originalExp *ExpressionNode) (Context, error) {
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return Context{}, fmt.Errorf("must use variable with a pipe, e.g. `exp as $x | ...`")
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}
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// variables are like loops in jq
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// https://stedolan.github.io/jq/manual/#Variable
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func variableLoop(d *dataTreeNavigator, context Context, originalExp *ExpressionNode) (Context, error) {
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log.Debug("variable loop!")
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results := list.New()
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var evaluateAllTogether = true
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for matchEl := context.MatchingNodes.Front(); matchEl != nil; matchEl = matchEl.Next() {
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evaluateAllTogether = evaluateAllTogether && matchEl.Value.(*CandidateNode).EvaluateTogether
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if !evaluateAllTogether {
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break
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}
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}
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if evaluateAllTogether {
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return variableLoopSingleChild(d, context, originalExp)
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}
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for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
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result, err := variableLoopSingleChild(d, context.SingleChildContext(el.Value.(*CandidateNode)), originalExp)
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if err != nil {
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return Context{}, err
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}
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results.PushBackList(result.MatchingNodes)
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}
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return context.ChildContext(results), nil
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}
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func variableLoopSingleChild(d *dataTreeNavigator, context Context, originalExp *ExpressionNode) (Context, error) {
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variableExp := originalExp.LHS
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lhs, err := d.GetMatchingNodes(context.ReadOnlyClone(), variableExp.LHS)
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if err != nil {
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return Context{}, err
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}
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if variableExp.RHS.Operation.OperationType.Type != "GET_VARIABLE" {
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return Context{}, fmt.Errorf("RHS of 'as' operator must be a variable name e.g. $foo")
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}
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variableName := variableExp.RHS.Operation.StringValue
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prefs := variableExp.Operation.Preferences.(assignVarPreferences)
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results := list.New()
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// now we loop over lhs, set variable to each result and calculate originalExp.Rhs
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for el := lhs.MatchingNodes.Front(); el != nil; el = el.Next() {
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log.Debug("PROCESSING VARIABLE: ", NodeToString(el.Value.(*CandidateNode)))
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var variableValue = list.New()
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if prefs.IsReference {
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variableValue.PushBack(el.Value)
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} else {
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candidateCopy := el.Value.(*CandidateNode).Copy()
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variableValue.PushBack(candidateCopy)
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}
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newContext := context.ChildContext(context.MatchingNodes)
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newContext.SetVariable(variableName, variableValue)
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rhs, err := d.GetMatchingNodes(newContext, originalExp.RHS)
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if err != nil {
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return Context{}, err
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}
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log.Debug("PROCESSING VARIABLE DONE, got back: ", rhs.MatchingNodes.Len())
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results.PushBackList(rhs.MatchingNodes)
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}
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// if there is no LHS - then I guess we just calculate originalExp.Rhs
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if lhs.MatchingNodes.Len() == 0 {
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return d.GetMatchingNodes(context, originalExp.RHS)
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}
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return context.ChildContext(results), nil
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}
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