Colored brackets

Description

Add color to brackets. Brackets will be coloured consecutively with the colors provided in color_seq by scope.

Usage

color_brackets(x, color_seq = list(yellow, blue, cyan))

Arguments

Details

Meant for coloring brackets encountered within highlight. Note that occurrences of 'orphan' brackets are not taken into account mainly due to the fact that cases such as

foo <- function(x){ `[`(x, 1) }

will either be converted to

foo <- function(x){ x[1]}

before the brackets are coloured if passed in as highlight(deparse(foo)) or will be identified as a 'SYMBOL_FUNCTION_CALL' token instead of 'LBB' if passed in as

highlight("foo <- function(x){ `[`(x, 1) }")

Similarly, invalid code that would lead to orphaned brackets is not taken into account as this would be caught before hand in highlight.

Default prettycode syntax highlighting style

Description

A style function must return a named list of functions. Possible entries:

• reserved: reserved words

• number: numeric literals

• null: the NULL constant

• operator: operators, including assignment

• call: function calls

• string: character literals

• comment: comments

• bracket: brackets: (){}[]

Usage

default_style()

Details

Each entry in a list must be a function that takes a character scalar, and returns a character scalar with the exception of bracket which should be a list of functions defining a color sequence. The default style adds ANSI formatting to the code.

Note that you can also change the code if you like, e.g. to include a unicode arrow character instead of the two-character assignment operator.

Examples

highlight(deparse(get), style = default_style())

Syntax highlight R code

Description

Syntax highlight R code

Usage

highlight(code, style = default_style())

Arguments

Value

Character vector, the highlighted code.

Examples

highlight(deparse(ls))
cat(highlight(deparse(ls)), sep = "\n")

Pretty Print R Code in the Terminal

Description

Replace the standard print method for functions with one that performs syntax highlighting, using ANSI colors, if the terminal supports them.

Usage

prettycode()

Print a function with syntax highlighting

Description

To turn on pretty printing of functions, you need to call prettycode::prettycode(). It might be a good idea to call it from your .Rprofile.

Usage

## S3 method for class 'function'
print(x, useSource = TRUE, style = default_style(),
  ...)

Arguments

Value

The function, invisibly.