blockr.core (version 0.1.1)

new_parser_block: Parser block constructors

Description

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 = "\"", ...)

Value

All blocks constructed via new_parser_block() inherit from parser_block.

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()

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.

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.