String manipulation of the output produced by VI.ggplot

Allows the output from VI.ggplot to be searched and replaced based on a search pattern.

Usage

# S3 method for class 'VIgraph'
grep(pattern, x, ...)
# S3 method for class 'VIgraph'
gsub(pattern, replacement, x, ...)

Arguments

pattern: Regular expression for matching, as per grep
replacement: Replacement text, as per gsub
x: object returned by VI.ggplot
...: other arguments passed on to grep or gsub to control matching behaviour

Details

The BrailleR package redefines the grep and gsub functions as generic functions (that dispatch on the x argument), with base::grep and base::gsub as the default methods. This grep.VIgraph method behaves like base::grep with value=TRUE (i.e., it returns the matched values, not the indices).

Value

Returns a new object of the same type as that returned by VI.ggplot, but with the text component restricted to only those lines that matched the pattern or with the text component replaced.

Author

Debra Warren and Paul Murrell

Examples

if (require(ggplot2)) {
    grep("axis", VI(qplot(1,1)))
    gsub("labels", "tick labels", VI(qplot(1,1)))
}
#> Warning: `qplot()` was deprecated in ggplot2 3.4.0.
#> This is an untitled chart with no subtitle or caption.
#> It has x-axis '1' with tick labels 0.950, 0.975, 1.000, 1.025 and 1.050.
#> It has y-axis '1' with tick labels 0.950, 0.975, 1.000, 1.025 and 1.050.
#> The chart is a set of 1 big solid circle point of which about 100% can be seen.
#> The points are at:
#> (1, 1)