challenge-algorithms-v2.0-s.../node_modules/v8-to-istanbul/lib/range.js

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2022-10-27 18:51:35 +00:00
/**
* ...something resembling a binary search, to find the lowest line within the range.
* And then you could break as soon as the line is longer than the range...
*/
module.exports.sliceRange = (lines, startCol, endCol, inclusive = false) => {
let start = 0
let end = lines.length
if (inclusive) {
// I consider this a temporary solution until I find an alternaive way to fix the "off by one issue"
--startCol
}
while (start < end) {
let mid = (start + end) >> 1
if (startCol >= lines[mid].endCol) {
start = mid + 1
} else if (endCol < lines[mid].startCol) {
end = mid - 1
} else {
end = mid
while (mid >= 0 && startCol < lines[mid].endCol && endCol >= lines[mid].startCol) {
--mid
}
start = mid + 1
break
}
}
while (end < lines.length && startCol < lines[end].endCol && endCol >= lines[end].startCol) {
++end
}
return lines.slice(start, end)
}