Parser block constructors — new_parser

Operating on results from blocks created via new_file_block(), parser blocks read (i.e. "parse") a file and make the contents available to subsequent blocks for further analysis and visualization.

Usage

new_parser_block(
  server,
  ui,
  class,
  ctor = sys.parent(),
  dat_valid = is_file,
  ...
)

new_csv_block(sep = ",", quote = "\"", ...)

Arguments

server: A function returning shiny::moduleServer()
ui: A function with a single argument (ns) returning a shiny.tag
class: Block subclass
ctor: String-valued constructor name or function/frame number (mostly for internal use or when defining constructors for virtual classes)
dat_valid: (Optional) input data validator
...: Forwarded to new_parser_block() and new_block()
sep, quote: Forwarded to utils::read.table()

Value

All blocks constructed via new_parser_block() inherit from parser_block.

Details

If using the default validator for a parser block sub-class (i.e. not overriding the dat_valid argument in the call to new_parser_block()), the data argument corresponding to the input file name must be file in order to match naming conventions in the validator function.

CSV block

Files in CSV format provided for example by a block created via new_file_block() may be parsed into data.frame by CSV blocks.