Methods to subset the character representation of the diff output. The subsetting bears no link to the line numbers in the diffs, only to the actual displayed diff.
# S4 method for Diff,numeric,missing,missing
[(x, i)# S4 method for Diff
head(x, n, ...)
# S4 method for Diff
tail(x, n, ...)
Diff object
subsetting index, must be numeric
integer(1L), the size for the resulting object
unused, for compatibility with generics
Diff object with subsetting indices recorded for use by
show
## `pager="off"` for CRAN compliance; you may omit in normal use
diff <- diffChr(letters, LETTERS, format="raw", pager="off")
diff[5:15]
head(diff, 5)
tail(diff, 5)
head(head(diff, 5), 8) ## note not 'typical' behavior
[ only supports numeric indices, and returns without error if you
specify out of bound indices. If you apply multiple subsetting methods they
will be applied in the following order irrespective of what order you
actually specify them in: [, then head, then tail.
If you use the same subsetting method multiple times on the same object,
the last call will define the outcome.
These methods are implemented by storing the chosen indices in the
Diff object and using them to subset the as.character output.
This mechanism explains the seemingly odd behavior documented above.