Return a function which reads in a text document from a tabular data structure (like a data frame or a list matrix) with knowledge about its internal structure and possible available metadata as specified by a so-called mapping.
A named list of characters. The
constructed reader will map each character entry to the content or
metadatum of the text document as specified by the named list
entry. Valid names include
Formally this function is a function generator, i.e., it returns a function (which reads in a text document) with a well-defined signature, but can access passed over arguments (e.g., the mapping) via lexical scoping.
function with the following formals:
a named list with the component
content which must
hold the document to be read in.
a string giving the language.
a character giving a unique identifier for the created text document.
The function returns a
PlainTextDocument representing the text
and metadata extracted from
elem$content. The arguments
id are used as fallback if no corresponding metadata entries are
Reader for basic information on the reader infrastructure
employed by package tm.
Vignette 'Extensions: How to Handle Custom File Formats'.
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df <- data.frame(contents = c("content 1", "content 2", "content 3"), title = c("title 1" , "title 2" , "title 3" ), authors = c("author 1" , "author 2" , "author 3" ), topics = c("topic 1" , "topic 2" , "topic 3" ), stringsAsFactors = FALSE) m <- list(content = "contents", heading = "title", author = "authors", topic = "topics") myReader <- readTabular(mapping = m) ds <- DataframeSource(df) elem <- getElem(stepNext(ds)) (result <- myReader(elem, language = "en", id = "id1")) meta(result)
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