output

[function! s:load_on()
  imap <expr> <Tab> neosnippet#expandable_or_jumpable() ?
\ "\<Plug>(neosnippet_expand_or_jump)" : "\<Tab>"
endfuncti]

vimlparser-backslash-offset.go

package main

import (
	"fmt"
	"strings"

	"github.com/haya14busa/go-vimlparser"
	"github.com/haya14busa/go-vimlparser/ast"
)

func main() {
	src := `
function! s:load_on()
  imap <expr> <Tab> neosnippet#expandable_or_jumpable() ?
\ "\<Plug>(neosnippet_expand_or_jump)" : "\<Tab>"
endfunction
`

	file, err := vimlparser.ParseFile(strings.NewReader(src), "src.vim", nil)
	if err != nil {
		panic(err)
	}

	// Inspect nodes and get above values from plugconf script
	ast.Inspect(file, func(node ast.Node) bool {
		// Cast to function node (return if it's not a function node)
		var fn *ast.Function
		if f, ok := node.(*ast.Function); !ok {
			return true
		} else {
			fn = f
		}

		body := extractBody(fn, src)
		fmt.Printf("[%s]\n", body)

		return true
	})

}

func extractBody(fn *ast.Function, src string) string {
	pos := fn.Pos()

	// TODO: Handle line break
	endpos := fn.EndFunction.Pos()
	endfunc := fn.EndFunction.ExArg
	cmdlen := endfunc.Argpos.Offset - endfunc.Cmdpos.Offset
	endpos.Offset += cmdlen

	return src[pos.Offset:endpos.Offset]
}