existsMetaValue-character-ANY-method: Check Existence of Meta Value (char-any)

In rappster/optionr: Management of customized (and nested) project/package options

Description

See generic: existsMetaValue

Usage

## S4 method for signature 'character,ANY'
existsMetaValue(id,
  where = tryCatch(devtools::as.package(".")$package, error = function(cond) {
      stop("Invalid default value for `where`") }), sub_id = character(),
  default = NULL, strict = c(0, 1, 2), ...)

Arguments

id	character.
where	ANY.

Value

See method existsMetaValue-char-env-method

Author(s)

Janko Thyson [e-mail]

References

http://github.com/Rappster/optionr

See Also

existsMetaValue

Examples

## Not run: 

##------------------------------------------------------------------------------
## Basics //
##------------------------------------------------------------------------------

setMetaValue(id = "test", value = TRUE)
existsMetaValue(id = "test")

setMetaValue(id = "a/b/c", value = 10)
existsMetaValue(id = "a")
existsMetaValue(id = "a/b")
existsMetaValue(id = "a/b/c")
existsMetaValue(id = "a/b/c/d")

existsMetaValue(id = "c")
existsMetaValue(id = "c/d/e")
  
##------------------------------------------------------------------------------
## Strictness levels //
##------------------------------------------------------------------------------

## Empty ID //
existsMetaValue(id = character())
try(existsMetaValue(id = character(), strict = 1))
try(existsMetaValue(id = character(), strict = 2))

## Not-existing //  
existsMetaValue(id = "c/d/e")
try(existsMetaValue(id = "c/d/e", strict = 1))
try(existsMetaValue(id = "c/d/e", strict = 2))

##------------------------------------------------------------------------------
## Explicit `where` //
##------------------------------------------------------------------------------

where <- new.env()
setMetaValue(id = "a/b/c", value = 10, where = where)
existsMetaValue(id = "a/b/c", where = where)
existsMetaValue(id = "a/b/c/d", where = where)
existsMetaValue(id = "c/d/e", where = where)

##------------------------------------------------------------------------------
## Sub ID //
##------------------------------------------------------------------------------

where <- new.env()
setMetaValue(id = "a/b/c", value = 10, where = where, sub_id = "sub")
ls(where)
existsMetaValue(id = "a/b/c", where = where, sub_id = "sub")
existsMetaValue(id = "a/b/c/d", where = where, sub_id = "sub")
existsMetaValue(id = "c/d/e", where = where, sub_id = "sub")


## End(Not run)

rappster/optionr documentation built on May 26, 2019, 11:23 p.m.