list.js
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The perfect library for lists. Supports search, sort, filters and flexibility. Built to be invisible and work on existing HTML
449 lines (435 loc) • 19.2 kB
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<h1><a href="index.html">All files</a> fuzzy.js</h1>
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<div class='fl pad1y space-right2'>
<span class="strong">95.24% </span>
<span class="quiet">Statements</span>
<span class='fraction'>60/63</span>
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<span class="strong">75% </span>
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<span class='fraction'>24/32</span>
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<span class="strong">100% </span>
<span class="quiet">Functions</span>
<span class='fraction'>3/3</span>
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<span class="strong">98.31% </span>
<span class="quiet">Lines</span>
<span class='fraction'>58/59</span>
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Press <em>n</em> or <em>j</em> to go to the next uncovered block, <em>b</em>, <em>p</em> or <em>k</em> for the previous block.
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">module.exports = function (text, pattern, options) {
// Aproximately where in the text is the pattern expected to be found?
var Match_Location = options.location || 0
//Determines how close the match must be to the fuzzy location (specified above). An exact letter match which is 'distance' characters away from the fuzzy location would score as a complete mismatch. A distance of '0' requires the match be at the exact location specified, a threshold of '1000' would require a perfect match to be within 800 characters of the fuzzy location to be found using a 0.8 threshold.
var Match_Distance = options.distance || <span class="branch-1 cbranch-no" title="branch not covered" >100</span>
// At what point does the match algorithm give up. A threshold of '0.0' requires a perfect match (of both letters and location), a threshold of '1.0' would match anything.
var Match_Threshold = options.threshold || <span class="branch-1 cbranch-no" title="branch not covered" >0.4</span>
<span class="missing-if-branch" title="if path not taken" >I</span>if (pattern === text) <span class="cstat-no" title="statement not covered" >return true </span>// Exact match
<span class="missing-if-branch" title="if path not taken" >I</span>if (pattern.length > 32) <span class="cstat-no" title="statement not covered" >return false </span>// This algorithm cannot be used
// Set starting location at beginning text and initialise the alphabet.
var loc = Match_Location,
s = (function () {
var q = {},
i
for (i = 0; i < pattern.length; i++) {
q[pattern.charAt(i)] = 0
}
for (i = 0; i < pattern.length; i++) {
q[pattern.charAt(i)] |= 1 << (pattern.length - i - 1)
}
return q
})()
// Compute and return the score for a match with e errors and x location.
// Accesses loc and pattern through being a closure.
function match_bitapScore_(e, x) {
var accuracy = e / pattern.length,
proximity = Math.abs(loc - x)
<span class="missing-if-branch" title="if path not taken" >I</span>if (!Match_Distance) {
// Dodge divide by zero error.
<span class="cstat-no" title="statement not covered" > return proximity ? 1.0 : accuracy</span>
}
return accuracy + proximity / Match_Distance
}
var score_threshold = Match_Threshold, // Highest score beyond which we give up.
best_loc = text.indexOf(pattern, loc) // Is there a nearby exact match? (speedup)
if (best_loc != -1) {
score_threshold = Math.min(match_bitapScore_(0, best_loc), score_threshold)
// What about in the other direction? (speedup)
best_loc = text.lastIndexOf(pattern, loc + pattern.length)
if (best_loc != -1) {
score_threshold = Math.min(match_bitapScore_(0, best_loc), score_threshold)
}
}
// Initialise the bit arrays.
var matchmask = 1 << (pattern.length - 1)
best_loc = -1
var bin_min, bin_mid
var bin_max = pattern.length + text.length
var last_rd
for (var d = 0; d < pattern.length; d++) {
// Scan for the best match; each iteration allows for one more error.
// Run a binary search to determine how far from 'loc' we can stray at this
// error level.
bin_min = 0
bin_mid = bin_max
while (bin_min < bin_mid) {
if (match_bitapScore_(d, loc + bin_mid) <= score_threshold) {
bin_min = bin_mid
} else {
bin_max = bin_mid
}
bin_mid = Math.floor((bin_max - bin_min) / 2 + bin_min)
}
// Use the result from this iteration as the maximum for the next.
bin_max = bin_mid
var start = Math.max(1, loc - bin_mid + 1)
var finish = Math.min(loc + bin_mid, text.length) + pattern.length
var rd = Array(finish + 2)
rd[finish + 1] = (1 << d) - 1
for (var j = finish; j >= start; j--) {
// The alphabet (s) is a sparse hash, so the following line generates
// warnings.
var charMatch = s[text.charAt(j - 1)]
if (d === 0) {
// First pass: exact match.
rd[j] = ((rd[j + 1] << 1) | 1) & charMatch
} else {
// Subsequent passes: fuzzy match.
rd[j] = (((rd[j + 1] << 1) | 1) & charMatch) | (((last_rd[j + 1] | last_rd[j]) << 1) | 1) | last_rd[j + 1]
}
if (rd[j] & matchmask) {
var score = match_bitapScore_(d, j - 1)
// This match will almost certainly be better than any existing match.
// But check anyway.
<span class="missing-if-branch" title="else path not taken" >E</span>if (score <= score_threshold) {
// Told you so.
score_threshold = score
best_loc = j - 1
if (best_loc > loc) {
// When passing loc, don't exceed our current distance from loc.
start = Math.max(1, 2 * loc - best_loc)
} else {
// Already passed loc, downhill from here on in.
break
}
}
}
}
// No hope for a (better) match at greater error levels.
if (match_bitapScore_(d + 1, loc) > score_threshold) {
break
}
last_rd = rd
}
return best_loc < 0 ? false : true
}
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