Create and apply patches to a text string

Patches are constructed via patch_make() and applied using patch_apply().

Usage

patch_make(x, y)

patch_apply(x, patch)

Arguments

x

The source string

y

The destination string

patch

A string representation of the patch(es).

Value

patch_make() returns a string representation of the patch(es).

• patch_apply() returns the patched version of the string x, the matches attribute contains logical values indicating which patches were successfully applied.

Examples

(p = patch_make("abcdef", "abchij"))
#> [1] "@@ -1,6 +1,6 @@\n abc\n-def\n+hij\n"

patch_apply("abcdef", p)
#> [1] "abchij"
#> attr(,"matches")
#> [1] TRUE

patch_apply("abc", p)
#> [1] "abchij"
#> attr(,"matches")
#> [1] TRUE

patch_apply("def", p)
#> [1] "hij"
#> attr(,"matches")
#> [1] TRUE

patch_apply("hij", p)
#> [1] "hij"
#> attr(,"matches")
#> [1] FALSE