AlignThreshold-class {diffobj}

Controls How Lines Within a Diff Hunk Are Aligned

Description

Controls How Lines Within a Diff Hunk Are Aligned

Slots

threshold

numeric(1L) between 0 and 1, what proportion of words in the lines must match in order to align them. Set to 1 to effectively turn aligning off. Defaults to 0.25.

min.chars

integer(1L) positive, minimum number of characters that must match across lines in order to align them. This requirement is in addition to threshold and helps minimize spurious alignments. Defaults to 3.

count.alnum.only

logical(1L) modifier for min.chars, whether to count alpha numeric characters only. Helps reduce spurious alignment caused by meta character sequences such as “[[1]]” that would otherwise meet the min.chars limit

Examples

a1 <- AlignThreshold(threshold=0)
a2 <- AlignThreshold(threshold=1)
a3 <- AlignThreshold(threshold=0, min.chars=2)
## Note how "e f g" is aligned
diffChr(c("a b c e", "d e f g"), "D e f g", align=a1, pager="off")
## But now it is not
diffChr(c("a b c e", "d e f g"), "D e f g", align=a2, pager="off")
## "e f" are not enough chars to align
diffChr(c("a b c", "d e f"), "D e f", align=a1, pager="off")
## Override with min.chars, so now they align
diffChr(c("a b c", "d e f"), "D e f", align=a3, pager="off")