diff2html/lib/rematch.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
function levenshtein(a, b) {
    if (a.length === 0) {
        return b.length;
    }
    if (b.length === 0) {
        return a.length;
    }
    var matrix = [];
    var i;
    for (i = 0; i <= b.length; i++) {
        matrix[i] = [i];
    }
    var j;
    for (j = 0; j <= a.length; j++) {
        matrix[0][j] = j;
    }
    for (i = 1; i <= b.length; i++) {
        for (j = 1; j <= a.length; j++) {
            if (b.charAt(i - 1) === a.charAt(j - 1)) {
                matrix[i][j] = matrix[i - 1][j - 1];
            }
            else {
                matrix[i][j] = Math.min(matrix[i - 1][j - 1] + 1, Math.min(matrix[i][j - 1] + 1, matrix[i - 1][j] + 1));
            }
        }
    }
    return matrix[b.length][a.length];
}
exports.levenshtein = levenshtein;
function newDistanceFn(str) {
    return function (x, y) {
        var xValue = str(x).trim();
        var yValue = str(y).trim();
        var lev = levenshtein(xValue, yValue);
        return lev / (xValue.length + yValue.length);
    };
}
exports.newDistanceFn = newDistanceFn;
function newMatcherFn(distance) {
    function findBestMatch(a, b, cache) {
        if (cache === void 0) { cache = new Map(); }
        var bestMatchDist = Infinity;
        var bestMatch;
        for (var i = 0; i < a.length; ++i) {
            for (var j = 0; j < b.length; ++j) {
                var cacheKey = JSON.stringify([a[i], b[j]]);
                var md = void 0;
                if (!(cache.has(cacheKey) && (md = cache.get(cacheKey)))) {
                    md = distance(a[i], b[j]);
                    cache.set(cacheKey, md);
                }
                if (md < bestMatchDist) {
                    bestMatchDist = md;
                    bestMatch = { indexA: i, indexB: j, score: bestMatchDist };
                }
            }
        }
        return bestMatch;
    }
    function group(a, b, level, cache) {
        if (level === void 0) { level = 0; }
        if (cache === void 0) { cache = new Map(); }
        var bm = findBestMatch(a, b, cache);
        if (!bm || a.length + b.length < 3) {
            return [[a, b]];
        }
        var a1 = a.slice(0, bm.indexA);
        var b1 = b.slice(0, bm.indexB);
        var aMatch = [a[bm.indexA]];
        var bMatch = [b[bm.indexB]];
        var tailA = bm.indexA + 1;
        var tailB = bm.indexB + 1;
        var a2 = a.slice(tailA);
        var b2 = b.slice(tailB);
        var group1 = group(a1, b1, level + 1, cache);
        var groupMatch = group(aMatch, bMatch, level + 1, cache);
        var group2 = group(a2, b2, level + 1, cache);
        var result = groupMatch;
        if (bm.indexA > 0 || bm.indexB > 0) {
            result = group1.concat(result);
        }
        if (a.length > tailA || b.length > tailB) {
            result = result.concat(group2);
        }
        return result;
    }
    return group;
}
exports.newMatcherFn = newMatcherFn;
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