// Copyright (c) 2009-2022 The MathJax Consortium
// SPDX-License-Identifier: Apache-2.0
// Sources: FilterUtil.cleanSubSup, ParseOptions.getList/inTree,
// ParseUtil.copyNode and NodeUtil.copyAttributes (MathJax 3.2.2).
package tex

import (
	

	
)

// Only actual SubsupItem Pop delivery publishes an unfinished generic node.
// Keep the diagnostic pendingBase views read-only. The private origin marker
// follows ParseUtil.copyNode's cloned registrations, including later pruning.
const poppedScriptOrigin = "poppedScriptOrigin"

func ( *parser) ( *scriptAttachment) *mml.Node {
	 := .pendingBase()
	.Properties = .Properties.Clone()
	.SetProperty(poppedScriptOrigin, true)
	.Children = append([]*mml.Node(nil), .Children...)
	.SetChildren(.Children)
	.notePoppedScript()
	return 
}

func ( *parser) ( *mml.Node) {
	if ,  := .Property(poppedScriptOrigin);  == true {
		.state.poppedScripts = append(.state.poppedScripts, )
	}
}

// This is the source parent-chain predicate, not a traversal-membership test.
// Discarded AutoOpen contents must not be validated just because they were
// once registered; their unfinished nodes are no longer live in this root.
func scriptInTree(,  *mml.Node) bool {
	for  != nil &&  !=  {
		 = .Parent
	}
	return  != nil
}

func cleanPoppedScripts( *mml.Node,  []*mml.Node) (*mml.Node, error) {
	for ,  := range []struct{ , ,  string }{
		{"msubsup", "msub", "msup"},
		{"munderover", "munder", "mover"},
	} {
		for ,  := range  {
			if .Kind != . || !scriptInTree(, ) {
				continue
			}
			var ,  *mml.Node
			if len(.Children) > 1 {
				 = .Children[1]
			}
			if len(.Children) > 2 {
				 = .Children[2]
			}
			if  != nil &&  != nil {
				continue
			}
			if  == nil &&  == nil {
				// The original fixed-arity constructor throws here. Preserve
				// its post-successful-parse timing as a bounded API error.
				return nil, fmt.Errorf("incomplete %s has no script child", .Kind)
			}
			,  := ., 
			if  == nil {
				,  = ., 
			}
			 := .Parent
			 := node(, .Children[0], )
			.Attributes = .Attributes
			.Properties = .Properties.Clone()
			if ,  := .Property("texClass");  {
				if ,  := sourceInt();  {
					.TeXClass = mml.TeXClass()
				}
			}
			if  == nil {
				 = 
			} else if  := .ReplaceChild(, );  != nil {
				return nil, 
			}
		}
	}
	return , nil
}