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Calculate Maximum Parentheses Depth

max_paren_depth.Rd

Calculates the maximum depth of nested parentheses in a string or character vector.

Usage

max_paren_depth(x, unmatched_err = TRUE)

Arguments

x

A character vector.

unmatched_err

Whether to signal an error or return NA for strings with unmatched parentheses,

Value

An integer vector of the same length as the input giving the maximum depth of nested parentheses in each element. NA will bStrings with unmatched parentheses will return NA

See also

Other general utilities: length_sort(), sandwich_text(), suggest_regex()

Examples

max_paren_depth(c("no parens", "a (1 deep)", "((a) and (b or (3 deep)))"))
#>                 no parens                a (1 deep) ((a) and (b or (3 deep))) 
#>                         0                         1                         3 

# errs by default
tryCatch(
  max_paren_depths("unmatched ( paren"),
  error = function(e) print(e$message)
)
#> [1] "could not find function \"max_paren_depths\""

# allow `NA` output for unmatched parentheses
max_paren_depth("unmatched ( paren", unmatched_err = FALSE)
#> unmatched ( paren 
#>                NA 
max_paren_depth(
  c("a (1 deep)", "((a) and (b or (3 deep)))", "unmatched ( paren"),
  unmatched_err = FALSE
)
#>                a (1 deep) ((a) and (b or (3 deep)))         unmatched ( paren 
#>                         1                         3                        NA