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String interpolation

Source: R/string_ops.R
gluestick.Rd

Expressions enclosed by specified delimiters will be evaluated as R code within the context of the src data/environment. The results will then be inserted into the original string via sprintf() i.e. string interpolation.

Usage

gluestick(fmt, src = parent.frame(), open = "{", close = "}", eval = TRUE)

Arguments

fmt

single <character> string containing the format specification.

src

data source. An environment, list, data.frame or anything supported by as.environment(). Default: parent.frame() i.e. the calling environment

open, close

the opening and closing <character> strings which delimit an expression. Default: {}. Note: the delimiters can be more complex than just a single character

eval

<logical>. Should the expressions be treated as R code to be evaluated? Default: TRUE means to treat the expressions as R code and evaluate. If FALSE, then no code evaluation will ever be done and expressions will be treated as only variable names in the given src data. This may be safer in some contexts e.g. for user supplied fmt strings.

Value

A <character> string with the expressions replaced by their values

Examples

gluestick("Hello {name}", list(name = '#RStats'))
#> [1] "Hello #RStats"

gluestick("Hello ~!name!~", list(name = '#RStats'), open = "~!", close = "!~")
#> [1] "Hello #RStats"

name <- '#RStats'
gluestick("Hello {name}")
#> [1] "Hello #RStats"