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Changeset: Factor out duplicate code

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This commit is contained in:
Richard Hansen 2021-10-16 17:54:03 -04:00
parent 4a65c2c8ff
commit b29e59419e
2 changed files with 9 additions and 124 deletions
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2
src/node/utils/padDiff.js
View file

@ -160,7 +160,7 @@ PadDiff.prototype._createDiffAtext = async function () {
if (superChangeset == null) {
superChangeset = changeset;
} else {
superChangeset = Changeset.composeWithDeletions(superChangeset, changeset, this._pad.pool);
superChangeset = Changeset.compose(superChangeset, changeset, this._pad.pool);
}
}

131
src/static/js/Changeset.js
View file

@ -1221,7 +1221,10 @@ const slicerZipperFunc = (attOp, csOp, opOut, pool) => {
opOut.opcode = '-';
opOut.chars = csOp.chars;
opOut.lines = csOp.lines;
opOut.attribs = '';
// csOp is a remove op and remove ops normally never have any attributes, so this should
// normally be the empty string. However, padDiff.js adds attributes to remove ops and
// needs them preserved so they are copied here.
opOut.attribs = csOp.attribs;
}
attOp.chars -= csOp.chars;
attOp.lines -= csOp.lines;
@ -1235,7 +1238,10 @@ const slicerZipperFunc = (attOp, csOp, opOut, pool) => {
opOut.opcode = '-';
opOut.chars = attOp.chars;
opOut.lines = attOp.lines;
opOut.attribs = '';
// csOp is a remove op and remove ops normally never have any attributes, so this should
// normally be the empty string. However, padDiff.js adds attributes to remove ops and
// needs them preserved so they are copied here.
opOut.attribs = csOp.attribs;
}
csOp.chars -= attOp.chars;
csOp.lines -= attOp.lines;
@ -2412,127 +2418,6 @@ const followAttributes = (att1, att2, pool) => {
return buf.toString();
};
exports.composeWithDeletions = (cs1, cs2, pool) => {
const unpacked1 = exports.unpack(cs1);
const unpacked2 = exports.unpack(cs2);
const len1 = unpacked1.oldLen;
const len2 = unpacked1.newLen;
assert(len2 === unpacked2.oldLen, 'mismatched composition of two changesets');
const len3 = unpacked2.newLen;
const bankIter1 = exports.stringIterator(unpacked1.charBank);
const bankIter2 = exports.stringIterator(unpacked2.charBank);
const bankAssem = exports.stringAssembler();
const newOps = applyZip(unpacked1.ops, unpacked2.ops, (op1, op2, opOut) => {
const op1code = op1.opcode;
const op2code = op2.opcode;
if (op1code === '+' && op2code === '-') {
bankIter1.skip(Math.min(op1.chars, op2.chars));
}
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
const slicerZipperFuncWithDeletions = (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.
if (attOp.opcode === '-') {
copyOp(attOp, opOut);
attOp.opcode = '';
} else if (!attOp.opcode) {
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
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 '':
{
copyOp(attOp, opOut);
attOp.opcode = '';
break;
}
}
}
};
exports.exportedForTestingOnly = {
followAttributes,
textLinesMutator,