You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: code_span.go
    path of file: ./repos/goldmark/parser
    
    the code of the file until where you have to start completion: package parser

import (
	"github.com/yuin/goldmark/ast"
	"github.com/yuin/goldmark/text"
)

type codeSpanParser struct {
}

var defaultCodeSpanParser = &codeSpanParser{}

// NewCodeSpanParser return a new InlineParser that parses inline codes
// surrounded by '`' .
func NewCodeSpanParser() InlineParser {
	return defaultCodeSpanParser
}

func (s *codeSpanParser) Trigger() []byte {
	return []byte{'`'}
}

func (s *codeSpanParser) Parse(parent ast.Node, block text.Reader, pc Context) ast.Node {
	line, startSegment := block.PeekLine()
	opener := 0
	for ; opener < len(line) && line[opener] == '`'; opener++ {
	}
	block.Advance(opener)
	l, pos := block.Position()
	node := ast.NewCodeSpan()
	for {
		line, segment := block.PeekLine()
		if line == nil {
			block.SetPosition(l, pos)
			return ast.NewTextSegment(startSegment.WithStop(startSegment.Start + opener))
		}
		for i := 0; i < len(line); i++ {
			c := line[i]
			if c == '`' {
				oldi := i
				for ; i < len(line) && line[i] == '`'; i++ {
				}
				closure := i - oldi
				if closure == opener && (i >= len(line) || line[i] != '`') {
					segment = segment.WithStop(segment.Start + i - closure)
					if !segment.IsEmpty() {
						node.AppendChild(node, ast.NewRawTextSegment(segment))
					}
					block.Advance(i)
					goto end
				}
			}
		}
		node.AppendChild(node, ast.NewRawTextSegment(segment))
		block.AdvanceLine()
	}
end:
	if !node.IsB
    
func (s *codeSpanParser) Parse(parent ast.Node, block text.Reader, pc Context) ast.Node {
	line, startSegment := block.PeekLine()
	opener := 0
	for ; opener < len(line) && line[opener] == '`'; opener++ {
	}
	block.Advance(opener)
	l, pos := block.Position()
	node := ast.NewCodeSpan()
	for {
		line, segment := block.PeekLine()
		if line == nil {
			block.SetPosition(l, pos)
			return ast.NewTextSegment(startSegment.WithStop(startSegment.Start + opener))
		}
		for i := 0; i < len(line); i++ {
			c := line[i]
			if c == '`' {
				oldi := i
				for ; i < len(line) && line[i] == '`'; i++ {
				}
				closure := i - oldi
				if closure == opener && (i >= len(line) || line[i] != '`') {
					segment = segment.WithStop(segment.Start + i - closure)
					if !segment.IsEmpty() {
						node.AppendChild(node, ast.NewRawTextSegment(segment))
					}
					block.Advance(i)
					goto end
				}
			}
		}
		node.AppendChild(node, ast.NewRawTextSegment(segment))
		block.AdvanceLine()
	}
end:
	if !node.IsBlank(block.Source()) {
		// trim first halfspace and last halfspace
		segment := node.FirstChild().(*ast.Text).Segment
		shouldTrimmed := true
		if !(!segment.IsEmpty() && isSpaceOrNewline(block.Source()[segment.Start])) {
			shouldTrimmed = false
		}
		segment = node.LastChild().(*ast.Text).Segment
		if !(!segment.IsEmpty() && isSpaceOrNewline(block.Source()[segment.Stop-1])) {
			shouldTrimmed = false
		}
		if shouldTrimmed {
			t := node.FirstChild().(*ast.Text)
			segment := t.Segment
			t.Segment = segment.WithStart(segment.Start + 1)
			t = node.LastChild().(*ast.Text)
			segment = node.LastChild().(*ast.Text).Segment
			t.Segment = segment.WithStop(segment.Stop - 1)
		}

	}
	return node
}