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package main
type MkShWalker struct {
}
func (w *MkShWalker) Walk(list *MkShList, callback func(node interface{})) {
for element := range w.iterate(list) {
callback(element)
}
}
func (w *MkShWalker) iterate(list *MkShList) <-chan interface{} {
elements := make(chan interface{})
go func() {
w.walkList(list, elements)
close(elements)
}()
return elements
}
func (w *MkShWalker) walkList(list *MkShList, collector chan<- interface{}) {
collector <- list
for _, andor := range list.AndOrs {
w.walkAndOr(andor, collector)
}
}
func (w *MkShWalker) walkAndOr(andor *MkShAndOr, collector chan<- interface{}) {
collector <- andor
for _, pipeline := range andor.Pipes {
w.walkPipeline(pipeline, collector)
}
}
func (w *MkShWalker) walkPipeline(pipeline *MkShPipeline, collector chan<- interface{}) {
collector <- pipeline
for _, command := range pipeline.Cmds {
w.walkCommand(command, collector)
}
}
func (w *MkShWalker) walkCommand(command *MkShCommand, collector chan<- interface{}) {
collector <- command
switch {
case command.Simple != nil:
w.walkSimpleCommand(command.Simple, collector)
case command.Compound != nil:
w.walkCompoundCommand(command.Compound, collector)
w.walkRedirects(command.Redirects, collector)
case command.FuncDef != nil:
w.walkFunctionDefinition(command.FuncDef, collector)
w.walkRedirects(command.Redirects, collector)
}
}
func (w *MkShWalker) walkSimpleCommand(command *MkShSimpleCommand, collector chan<- interface{}) {
collector <- command
w.walkWords(command.Assignments, collector)
if command.Name != nil {
w.walkWord(command.Name, collector)
}
w.walkWords(command.Args, collector)
w.walkRedirects(command.Redirections, collector)
}
func (w *MkShWalker) walkCompoundCommand(command *MkShCompoundCommand, collector chan<- interface{}) {
collector <- command
switch {
case command.Brace != nil:
w.walkList(command.Brace, collector)
case command.Case != nil:
w.walkCase(command.Case, collector)
case command.For != nil:
w.walkFor(command.For, collector)
case command.If != nil:
w.walkIf(command.If, collector)
case command.Loop != nil:
w.walkLoop(command.Loop, collector)
case command.Subshell != nil:
w.walkList(command.Subshell, collector)
}
}
func (w *MkShWalker) walkCase(caseClause *MkShCaseClause, collector chan<- interface{}) {
collector <- caseClause
w.walkWord(caseClause.Word, collector)
for _, caseItem := range caseClause.Cases {
collector <- caseItem
w.walkWords(caseItem.Patterns, collector)
w.walkList(caseItem.Action, collector)
}
}
func (w *MkShWalker) walkFunctionDefinition(funcdef *MkShFunctionDefinition, collector chan<- interface{}) {
collector <- funcdef
w.walkCompoundCommand(funcdef.Body, collector)
}
func (w *MkShWalker) walkIf(ifClause *MkShIfClause, collector chan<- interface{}) {
collector <- ifClause
for i, cond := range ifClause.Conds {
w.walkList(cond, collector)
w.walkList(ifClause.Actions[i], collector)
}
if ifClause.Else != nil {
w.walkList(ifClause.Else, collector)
}
}
func (w *MkShWalker) walkLoop(loop *MkShLoopClause, collector chan<- interface{}) {
collector <- loop
w.walkList(loop.Cond, collector)
w.walkList(loop.Action, collector)
}
func (w *MkShWalker) walkWords(words []*ShToken, collector chan<- interface{}) {
collector <- words
for _, word := range words {
w.walkWord(word, collector)
}
}
func (w *MkShWalker) walkWord(word *ShToken, collector chan<- interface{}) {
collector <- word
}
func (w *MkShWalker) walkRedirects(redirects []*MkShRedirection, collector chan<- interface{}) {
collector <- redirects
for _, redirect := range redirects {
collector <- redirect
w.walkWord(redirect.Target, collector)
}
}
func (w *MkShWalker) walkFor(forClause *MkShForClause, collector chan<- interface{}) {
collector <- forClause
collector <- forClause.Varname
w.walkWords(forClause.Values, collector)
w.walkList(forClause.Body, collector)
}
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