Extract a color value from a brand object

Safely extracts a color value from a brand object based on the provided key. This function handles color references and resolves them, including references to palette colors and other theme colors. It detects and prevents cyclic references.

Usage

brand_color_pluck(brand, key)

Arguments

brand

A brand object created by read_brand_yml() or as_brand_yml().

key

A character string representing the color key to extract.

Value

The resolved color value (typically a hex color code) if the key exists, otherwise returns the key itself.

Details

The function checks for the color key in both the main color theme and the color palette. It can resolve references between colors (e.g., if "primary" references "palette.blue"). If a cyclic reference is detected (e.g., A references B which references A), the function will throw an error.

See also

Other brand.yml helpers: brand_has(), brand_pluck()

Examples

brand <- as_brand_yml(list(
  color = list(
    primary = "blue",
    secondary = "info",
    info = "light-blue",
    palette = list(
      blue = "#004488",
      light_blue = "#c3ddff"
    )
  )
))

# Extract the primary color
brand_color_pluck(brand, "primary") # "#004488"
#> [1] "#004488"

# Extract a color that references another color
brand_color_pluck(brand, "info") # "#c3ddff"
#> [1] "#c3ddff"

# Extract a color that references another color
# which in turn references the palette
brand_color_pluck(brand, "secondary") # "#c3ddff"
#> [1] "#c3ddff"

# Extract a color that isn't defined
brand_color_pluck(brand, "green") # "green"
#> [1] "green"

# Use brand_pluck() if you need direct (resolved) values
brand_pluck(brand, "color", "primary") # "#004488"
#> [1] "#004488"
brand_pluck(brand, "color", "info") # "#c3ddff"
#> [1] "#c3ddff"
brand_pluck(brand, "color", "green") # NULL
#> NULL