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Wiki Rasa
Commits
168ac46a
Commit
168ac46a
authored
6 years ago
by
Lukas Gehrke
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Fügt Skript für Birthdate-Extraktion hinzu.
parent
3207c37f
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!21
Resolve "R-Skript für Birthdate erstellen"
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168ac46a
#!/usr/bin/env Rscript
### Extracts birthdate fronm the infobox
### If there is no infobox the Introduction text can be checked
# Author: Lukas
## Librarys
library
(
rvest
)
library
(
stringr
)
library
(
data.table
)
### Try to extract birthdate from infobox
### If there is no infobox, try to extract from introduction text
getBirthdate
<-
function
(
article
)
{
# check
if
(
!
grepl
(
"vcard"
,
article
))
{
# check first paragraph
introduction
<-
getIntroduction
(
article
)
if
(
!
introduction
==
""
)
{
# get birthdate inside of parentheses
birthdate
<-
str_extract_all
(
introduction
,
"\\([^()]+\\)"
)[[
1
]]
# remove parentheses
birthdate
<-
substring
(
birthdate
,
2
,
nchar
(
birthdate
)
-1
)
}
else
{
# retrun Null if there is no birthdate
return
(
0
)
}
}
# try to get birthdate via infobox
infoBox
<-
getInfoBox
(
article
)
# get the born field
birthdate
<-
infoBox
[
infoBox
$
Desc
%like%
"Born"
,]
$
Content
# remove everything except the birthdate
# remove everything in round brackets
birthdate
<-
gsub
(
"\\s*\\([^\\)]+\\)"
,
""
,
birthdate
)
# remove everything starting with newline
birthdate
<-
gsub
(
"\\n.*$"
,
""
,
birthdate
)
return
(
birthdate
)
}
### Uses Davids function to get infobox
### Converts info box to table
getInfoBox
<-
function
(
article
)
{
# Read page as html
page
<-
read_html
(
article
)
# Extracting text from the html will erase all <br> tags,
# this will replace them with line breaks
xml_find_all
(
page
,
".//br"
)
%>%
xml_add_sibling
(
"p"
,
"\n"
)
xml_find_all
(
page
,
".//br"
)
%>%
xml_remove
()
# Get the info box
# Will throw an error if there isnt any, so that should be checked beforehand
table
<-
page
%>%
html_nodes
(
"table.vcard"
)
%>%
html_table
(
fill
=
TRUE
)
%>%
.
[[
1
]]
colnames
(
table
)
<-
c
(
"Desc"
,
"Content"
)
return
(
table
)
}
### Get Introduction Text from Wikipedia page that contains birthdate
getIntroduction
<-
function
(
article
)
{
# Read page as html
page
<-
read_html
(
article
)
# Extracting text from the html will erase all <br> tags,
# This will replace them with line breaks
xml_find_all
(
page
,
".//br"
)
%>%
xml_add_sibling
(
"p"
,
"\n"
)
xml_find_all
(
page
,
".//br"
)
%>%
xml_remove
# Get first paragraph
introduction
<-
page
%>%
html_nodes
(
"p"
)
%>%
html_text
()
%>%
.
[[
1
]]
# Return first paragraph
return
(
introduction
)
}
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