Reading in HTML/XML PDF file formats into R
Question
I am trying to parse a pdf by reading it into R as either an HTML/XML file. I am aware that I could read it in using the pdftools package. However if I were to read the link just as an HTML/XML file, I have been unable to access the data inside.
library(xml2)
library(XML)
html_string="https://mchb.hrsa.gov/whusa11/hstat/hsrmh/downloads/pdf/233ml.pdf"
ht <-read_html(html_string)
nodes<-xml_find_all(ht, ".//body")
> ht
{xml_document}
<html>
[1] <body><p>%PDF-1.6\r%\xe2ãÏÓ\r\n83 0 obj\r<>stream\r\nhÞ\u009cTË\u008eÓ@äSú'»çÑ3\u0096V+EA\\"V«$·\u ...
[2] <html><p>\u009d@a ö¯\u0088Î÷Ü\\&ÔÈýÐâÿZO^"j[FoQ)ÒÇq\n\u009b\u008dx\u0085\u008eß±µ\u009bõo\t\u008f6¢ ...
> ht[1]
$node
<pointer: 0x00000000047901a0>
I tried the following functions as well
xmlTreeParse
xmlToList
xmlParse
How do I access the xml document content string inside? I am tring to make them objects that I can manipulate.
2 answers
solution1
4 2019-05-10 20:08:13
A possible solution using pdfx
# download file to your home dir
download.file("https://mchb.hrsa.gov/whusa11/hstat/hsrmh/downloads/pdf/233ml.pdf","233ml.pdf")
# get packages
library(remotes)
remotes::install_github("sckott/extractr")
library(extractr)
#parse
pdfx(file="233ml.pdf", what="parsed")
solution2
2 ACCPTED 2019-05-18 14:52:32
Your xml_document ht includes 1x body and 13x html you can use html_node or html_nodes from rvest to extract the pieces you need.
library(xml2)
library(XML)
library(rvest)
library(dplyr)
html_string="https://mchb.hrsa.gov/whusa11/hstat/hsrmh/downloads/pdf/233ml.pdf"
ht <-read_html(html_string)
ht %>% html_nodes("html") # look at all html nodes
ht %>% html_node("body") # look at body node
Accordind to your question it looks like you would like to have the body node as text, right?
You can get it with:
ht %>% html_node("body") %>% as.character -> text #get body node as text
text
[1] "<body><p>%PDF-1.6\r%\xe2ãÏÓ\r\n83 0 obj\r<&g...
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