new_parser_block: Parser block constructors

In blockr.core: Graphical Web-Framework for Data Manipulation and Visualization

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 = "\"", ...)

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()

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.

Value

All blocks constructed via new_parser_block() inherit from parser_block.

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.

blockr.core documentation built on June 8, 2025, 1:43 p.m.