README.md
In cuche27/CSS: Extract information from an html document with CSS selectors
CSS
Extracting data from an html file may be done in R with package XML, but it is quite tedious.
This is why I have developed this package : it provides wrapper functions that take as input
CSS path and translate them in xpath queries. Moreover some functions facilitate extraction
of specific information like numbers or urls.
INSTALLATION
In R console, execute the following commands
install.packages("devtools")
library(devtools)
install_github("CSS", "cuche27")
USAGE
library(CSS)
# Let's create a fake html page
doc <- "<html>
<head></head>
<body>
<div id='character1' class='character'>
<span class='name'>Mike</span>
<span class='level digit'>10</span>
<a href='http://someurl.com'>Complete profile</a>
</div>
<div id='character2' class='character'>
<span class='name'>Stan</span>
<a href='http://someurl2.com'>Complete profile</a>
</div>
</body>
</html>"
# parse the html
doc <- htmlParse(doc)
# Extract the names of the characters
cssApply(doc, ".character>.name", cssCharacter)
# Extract the name of character1
cssApply(doc, "#character1>.name", cssCharacter)
# Urls of the profiles
cssApply(doc, ".character>a", cssLink)
# Level of characters
cssApply(doc, ".character>.level", cssNumeric)
# character 2 does not have level, we would want to have a NA value instead of nothing
cssApplyInNodeSet(doc, ".character", ".level", cssNumeric)
cuche27/CSS documentation built on Oct. 20, 2019, 1:09 a.m.
R Package Documentation
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We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
CSS
Extracting data from an html file may be done in R with package XML, but it is quite tedious. This is why I have developed this package : it provides wrapper functions that take as input CSS path and translate them in xpath queries. Moreover some functions facilitate extraction of specific information like numbers or urls.
INSTALLATION
In R console, execute the following commands
install.packages("devtools")
library(devtools)
install_github("CSS", "cuche27")
USAGE
library(CSS)
# Let's create a fake html page
doc <- "<html>
<head></head>
<body>
<div id='character1' class='character'>
<span class='name'>Mike</span>
<span class='level digit'>10</span>
<a href='http://someurl.com'>Complete profile</a>
</div>
<div id='character2' class='character'>
<span class='name'>Stan</span>
<a href='http://someurl2.com'>Complete profile</a>
</div>
</body>
</html>"
# parse the html
doc <- htmlParse(doc)
# Extract the names of the characters
cssApply(doc, ".character>.name", cssCharacter)
# Extract the name of character1
cssApply(doc, "#character1>.name", cssCharacter)
# Urls of the profiles
cssApply(doc, ".character>a", cssLink)
# Level of characters
cssApply(doc, ".character>.level", cssNumeric)
# character 2 does not have level, we would want to have a NA value instead of nothing
cssApplyInNodeSet(doc, ".character", ".level", cssNumeric)
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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