Split a string into emoji and non-emoji glyph runs — str_split

In order to do correct text rendering, the font needed must be figured out. A common case is rendering of emojis within a string where the system emoji font is used rather than the requested font. This function will inspect the provided strings and split them up in runs that must be rendered with the emoji font, and the rest. Arguments are recycled to the length of the string vector.

Usage

str_split_emoji(
  string,
  family = "",
  italic = FALSE,
  bold = FALSE,
  path = NULL,
  index = 0
)

Arguments

string: A character vector of strings that should be splitted.
family: The name of the font families to match
italic: logical indicating the font slant
bold: logical indicating whether the font weight
path, index: path an index of a font file to circumvent lookup based on family and style

Value

A data.frame containing the following columns:

string: The substring containing a consecutive run of glyphs
id: The index into the original string vector that the substring is part of
emoji: A logical vector giving if the substring is a run of emojis or not

Examples

emoji_string <- "This is a joke\U0001f642. It should be obvious from the smiley"
str_split_emoji(emoji_string)
#> # A tibble: 3 × 3
#>   string                                    id emoji
#>   <chr>                                  <dbl> <lgl>
#> 1 This is a joke                             1 FALSE
#> 2 🙂                                         1 TRUE 
#> 3 . It should be obvious from the smiley     1 FALSE