Class: ArrayDiff
- Inherits:
-
Object
- Object
- ArrayDiff
- Defined in:
- lib/array_diff.rb
Constant Summary collapse
- VERSION =
0.3
Instance Attribute Summary collapse
-
#diffs ⇒ Object
readonly
Returns the value of attribute diffs.
-
#difftype ⇒ Object
readonly
Returns the value of attribute difftype.
Class Method Summary collapse
Instance Method Summary collapse
- #compact ⇒ Object
- #compact! ⇒ Object
- #compactdiffs ⇒ Object
- #diffrange(a, b) ⇒ Object
- #discarda(i, elem) ⇒ Object
- #discardb(i, elem) ⇒ Object
-
#initialize(diffs_or_a, b = nil, isstring = nil) ⇒ ArrayDiff
constructor
A new instance of ArrayDiff.
- #inspect ⇒ Object
- #makediff(a, b) ⇒ Object
- #match(ai, bi) ⇒ Object
- #to_diff ⇒ Object
Constructor Details
#initialize(diffs_or_a, b = nil, isstring = nil) ⇒ ArrayDiff
Returns a new instance of ArrayDiff.
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# File 'lib/array_diff.rb', line 109 def initialize(diffs_or_a, b = nil, isstring = nil) if b.nil? @diffs = diffs_or_a @isstring = isstring else @diffs = [] @curdiffs = [] makediff(diffs_or_a, b) @difftype = diffs_or_a.class end end |
Instance Attribute Details
#diffs ⇒ Object (readonly)
Returns the value of attribute diffs.
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# File 'lib/array_diff.rb', line 107 def diffs @diffs end |
#difftype ⇒ Object (readonly)
Returns the value of attribute difftype.
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# File 'lib/array_diff.rb', line 107 def difftype @difftype end |
Class Method Details
.lcs(a, b) ⇒ Object
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# File 'lib/array_diff.rb', line 5 def ArrayDiff.lcs(a, b) astart = 0 bstart = 0 afinish = a.length-1 bfinish = b.length-1 mvector = [] # First we prune off any common elements at the beginning while (astart <= afinish && bstart <= afinish && a[astart] == b[bstart]) mvector[astart] = bstart astart += 1 bstart += 1 end # now the end while (astart <= afinish && bstart <= bfinish && a[afinish] == b[bfinish]) mvector[afinish] = bfinish afinish -= 1 bfinish -= 1 end bmatches = b.reverse_hash(bstart..bfinish) thresh = [] links = [] (astart..afinish).each { |aindex| aelem = a[aindex] next unless bmatches.has_key? aelem k = nil bmatches[aelem].reverse.each { |bindex| if k && (thresh[k] > bindex) && (thresh[k-1] < bindex) thresh[k] = bindex else k = thresh.replacenextlarger(bindex, k) end links[k] = [ (k==0) ? nil : links[k-1], aindex, bindex ] if k } } if !thresh.empty? link = links[thresh.length-1] while link mvector[link[1]] = link[2] link = link[0] end end return mvector end |
Instance Method Details
#compact ⇒ Object
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# File 'lib/array_diff.rb', line 134 def compact return Diff.new(compactdiffs) end |
#compact! ⇒ Object
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# File 'lib/array_diff.rb', line 138 def compact! @diffs = compactdiffs end |
#compactdiffs ⇒ Object
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# File 'lib/array_diff.rb', line 84 def compactdiffs diffs = [] @diffs.each { |df| i = 0 curdiff = [] while i < df.length whot = df[i][0] s = @isstring ? df[i][2].chr : [df[i][2]] p = df[i][1] last = df[i][1] i += 1 while df[i] && df[i][0] == whot && df[i][1] == last+1 s << df[i][2] last = df[i][1] i += 1 end curdiff.push [whot, p, s] end diffs.push curdiff } return diffs end |
#diffrange(a, b) ⇒ Object
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# File 'lib/array_diff.rb', line 146 def diffrange(a, b) if (a == b) "#{a}" else "#{a},#{b}" end end |
#discarda(i, elem) ⇒ Object
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# File 'lib/array_diff.rb', line 126 def discarda(i, elem) @curdiffs.push ['-', i, elem] end |
#discardb(i, elem) ⇒ Object
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# File 'lib/array_diff.rb', line 130 def discardb(i, elem) @curdiffs.push ['+', i, elem] end |
#inspect ⇒ Object
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# File 'lib/array_diff.rb', line 142 def inspect @diffs.inspect end |
#makediff(a, b) ⇒ Object
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# File 'lib/array_diff.rb', line 55 def makediff(a, b) mvector = ArrayDiff.lcs(a, b) ai = bi = 0 while ai < mvector.length bline = mvector[ai] if bline while bi < bline discardb(bi, b[bi]) bi += 1 end match(ai, bi) bi += 1 else discarda(ai, a[ai]) end ai += 1 end while ai < a.length discarda(ai, a[ai]) ai += 1 end while bi < b.length discardb(bi, b[bi]) bi += 1 end match(ai, bi) 1 end |
#match(ai, bi) ⇒ Object
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# File 'lib/array_diff.rb', line 121 def match(ai, bi) @diffs.push @curdiffs unless @curdiffs.empty? @curdiffs = [] end |
#to_diff ⇒ Object
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# File 'lib/array_diff.rb', line 154 def to_diff offset = 0 @diffs.each { |b| first = b[0][1] length = b.length action = b[0][0] addcount = 0 remcount = 0 b.each { |l| if l[0] == "+" addcount += 1 elsif l[0] == "-" remcount += 1 end } if addcount == 0 puts "#{diffrange(first+1, first+remcount)}d#{first+offset}" elsif remcount == 0 puts "#{first-offset}a#{diffrange(first+1, first+addcount)}" else puts "#{diffrange(first+1, first+remcount)}c#{diffrange(first+offset+1, first+offset+addcount)}" end lastdel = (b[0][0] == "-") b.each { |l| if l[0] == "-" offset -= 1 print "< " elsif l[0] == "+" offset += 1 if lastdel lastdel = false puts "---" end print "> " end print l[2] print "\n" } } end |