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Added missing functions to create pad diffs

pull/1417/head
Peter 'Pita' Martischka 2013-01-27 15:40:37 +00:00
parent f4690dda9d
commit dcfb1b2ea4
1 changed files with 118 additions and 0 deletions
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118
src/static/js/Changeset.js
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@ -2182,3 +2182,121 @@ exports.followAttributes = function (att1, att2, pool) {
}
return buf.toString();
};
exports.composeWithDeletions = function (cs1, cs2, pool) {
var unpacked1 = exports.unpack(cs1);
var unpacked2 = exports.unpack(cs2);
var len1 = unpacked1.oldLen;
var len2 = unpacked1.newLen;
exports.assert(len2 == unpacked2.oldLen, "mismatched composition");
var len3 = unpacked2.newLen;
var bankIter1 = exports.stringIterator(unpacked1.charBank);
var bankIter2 = exports.stringIterator(unpacked2.charBank);
var bankAssem = exports.stringAssembler();
var newOps = exports.applyZip(unpacked1.ops, 0, unpacked2.ops, 0, function (op1, op2, opOut) {
var op1code = op1.opcode;
var op2code = op2.opcode;
if (op1code == '+' && op2code == '-') {
bankIter1.skip(Math.min(op1.chars, op2.chars));
}
exports._slicerZipperFuncWithDeletions(op1, op2, opOut, pool);
if (opOut.opcode == '+') {
if (op2code == '+') {
bankAssem.append(bankIter2.take(opOut.chars));
} else {
bankAssem.append(bankIter1.take(opOut.chars));
}
}
});
return exports.pack(len1, len3, newOps, bankAssem.toString());
};
// This function is 95% like _slicerZipperFunc, we just changed two lines to ensure it merges the attribs of deletions properly.
// This is necassary for correct paddiff. But to ensure these changes doesn't affect anything else, we've created a seperate function only used for paddiffs
exports._slicerZipperFuncWithDeletions= function (attOp, csOp, opOut, pool) {
// attOp is the op from the sequence that is being operated on, either an
// attribution string or the earlier of two exportss being composed.
// pool can be null if definitely not needed.
//print(csOp.toSource()+" "+attOp.toSource()+" "+opOut.toSource());
if (attOp.opcode == '-') {
exports.copyOp(attOp, opOut);
attOp.opcode = '';
} else if (!attOp.opcode) {
exports.copyOp(csOp, opOut);
csOp.opcode = '';
} else {
switch (csOp.opcode) {
case '-':
{
if (csOp.chars <= attOp.chars) {
// delete or delete part
if (attOp.opcode == '=') {
opOut.opcode = '-';
opOut.chars = csOp.chars;
opOut.lines = csOp.lines;
opOut.attribs = csOp.attribs; //changed by yammer
}
attOp.chars -= csOp.chars;
attOp.lines -= csOp.lines;
csOp.opcode = '';
if (!attOp.chars) {
attOp.opcode = '';
}
} else {
// delete and keep going
if (attOp.opcode == '=') {
opOut.opcode = '-';
opOut.chars = attOp.chars;
opOut.lines = attOp.lines;
opOut.attribs = csOp.attribs; //changed by yammer
}
csOp.chars -= attOp.chars;
csOp.lines -= attOp.lines;
attOp.opcode = '';
}
break;
}
case '+':
{
// insert
exports.copyOp(csOp, opOut);
csOp.opcode = '';
break;
}
case '=':
{
if (csOp.chars <= attOp.chars) {
// keep or keep part
opOut.opcode = attOp.opcode;
opOut.chars = csOp.chars;
opOut.lines = csOp.lines;
opOut.attribs = exports.composeAttributes(attOp.attribs, csOp.attribs, attOp.opcode == '=', pool);
csOp.opcode = '';
attOp.chars -= csOp.chars;
attOp.lines -= csOp.lines;
if (!attOp.chars) {
attOp.opcode = '';
}
} else {
// keep and keep going
opOut.opcode = attOp.opcode;
opOut.chars = attOp.chars;
opOut.lines = attOp.lines;
opOut.attribs = exports.composeAttributes(attOp.attribs, csOp.attribs, attOp.opcode == '=', pool);
attOp.opcode = '';
csOp.chars -= attOp.chars;
csOp.lines -= attOp.lines;
}
break;
}
case '':
{
exports.copyOp(attOp, opOut);
attOp.opcode = '';
break;
}
}
}
};