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lunr.js
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lunr.js
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/**
* lunr - http://lunrjs.com - A bit like Solr, but much smaller and not as bright - 2.3.9
* Copyright (C) 2020 Oliver Nightingale
* @license MIT
*/
;(function(){
/**
* A convenience function for configuring and constructing
* a new lunr Index.
*
* A lunr.Builder instance is created and the pipeline setup
* with a trimmer, stop word filter and stemmer.
*
* This builder object is yielded to the configuration function
* that is passed as a parameter, allowing the list of fields
* and other builder parameters to be customised.
*
* All documents _must_ be added within the passed config function.
*
* @example
* var idx = lunr(function () {
* this.field('title')
* this.field('body')
* this.ref('id')
*
* documents.forEach(function (doc) {
* this.add(doc)
* }, this)
* })
*
* @see {@link lunr.Builder}
* @see {@link lunr.Pipeline}
* @see {@link lunr.trimmer}
* @see {@link lunr.stopWordFilter}
* @see {@link lunr.stemmer}
* @namespace {function} lunr
*/
var lunr = function (config) {
var builder = new lunr.Builder
builder.pipeline.add(
lunr.trimmer,
lunr.stopWordFilter,
lunr.stemmer
)
builder.searchPipeline.add(
lunr.stemmer
)
config.call(builder, builder)
return builder.build()
}
lunr.version = "2.3.9"
/*!
* lunr.utils
* Copyright (C) 2020 Oliver Nightingale
*/
/**
* A namespace containing utils for the rest of the lunr library
* @namespace lunr.utils
*/
lunr.utils = {}
/**
* Print a warning message to the console.
*
* @param {String} message The message to be printed.
* @memberOf lunr.utils
* @function
*/
lunr.utils.warn = (function (global) {
/* eslint-disable no-console */
return function (message) {
if (global.console && console.warn) {
console.warn(message)
}
}
/* eslint-enable no-console */
})(this)
/**
* Convert an object to a string.
*
* In the case of `null` and `undefined` the function returns
* the empty string, in all other cases the result of calling
* `toString` on the passed object is returned.
*
* @param {Any} obj The object to convert to a string.
* @return {String} string representation of the passed object.
* @memberOf lunr.utils
*/
lunr.utils.asString = function (obj) {
if (obj === void 0 || obj === null) {
return ""
} else {
return obj.toString()
}
}
/**
* Clones an object.
*
* Will create a copy of an existing object such that any mutations
* on the copy cannot affect the original.
*
* Only shallow objects are supported, passing a nested object to this
* function will cause a TypeError.
*
* Objects with primitives, and arrays of primitives are supported.
*
* @param {Object} obj The object to clone.
* @return {Object} a clone of the passed object.
* @throws {TypeError} when a nested object is passed.
* @memberOf Utils
*/
lunr.utils.clone = function (obj) {
if (obj === null || obj === undefined) {
return obj
}
var clone = Object.create(null),
keys = Object.keys(obj)
for (var i = 0; i < keys.length; i ) {
var key = keys[i],
val = obj[key]
if (Array.isArray(val)) {
clone[key] = val.slice()
continue
}
if (typeof val === 'string' ||
typeof val === 'number' ||
typeof val === 'boolean') {
clone[key] = val
continue
}
throw new TypeError("clone is not deep and does not support nested objects")
}
return clone
}
lunr.FieldRef = function (docRef, fieldName, stringValue) {
this.docRef = docRef
this.fieldName = fieldName
this._stringValue = stringValue
}
lunr.FieldRef.joiner = "/"
lunr.FieldRef.fromString = function (s) {
var n = s.indexOf(lunr.FieldRef.joiner)
if (n === -1) {
throw "malformed field ref string"
}
var fieldRef = s.slice(0, n),
docRef = s.slice(n 1)
return new lunr.FieldRef (docRef, fieldRef, s)
}
lunr.FieldRef.prototype.toString = function () {
if (this._stringValue == undefined) {
this._stringValue = this.fieldName lunr.FieldRef.joiner this.docRef
}
return this._stringValue
}
/*!
* lunr.Set
* Copyright (C) 2020 Oliver Nightingale
*/
/**
* A lunr set.
*
* @constructor
*/
lunr.Set = function (elements) {
this.elements = Object.create(null)
if (elements) {
this.length = elements.length
for (var i = 0; i < this.length; i ) {
this.elements[elements[i]] = true
}
} else {
this.length = 0
}
}
/**
* A complete set that contains all elements.
*
* @static
* @readonly
* @type {lunr.Set}
*/
lunr.Set.complete = {
intersect: function (other) {
return other
},
union: function () {
return this
},
contains: function () {
return true
}
}
/**
* An empty set that contains no elements.
*
* @static
* @readonly
* @type {lunr.Set}
*/
lunr.Set.empty = {
intersect: function () {
return this
},
union: function (other) {
return other
},
contains: function () {
return false
}
}
/**
* Returns true if this set contains the specified object.
*
* @param {object} object - Object whose presence in this set is to be tested.
* @returns {boolean} - True if this set contains the specified object.
*/
lunr.Set.prototype.contains = function (object) {
return !!this.elements[object]
}
/**
* Returns a new set containing only the elements that are present in both
* this set and the specified set.
*
* @param {lunr.Set} other - set to intersect with this set.
* @returns {lunr.Set} a new set that is the intersection of this and the specified set.
*/
lunr.Set.prototype.intersect = function (other) {
var a, b, elements, intersection = []
if (other === lunr.Set.complete) {
return this
}
if (other === lunr.Set.empty) {
return other
}
if (this.length < other.length) {
a = this
b = other
} else {
a = other
b = this
}
elements = Object.keys(a.elements)
for (var i = 0; i < elements.length; i ) {
var element = elements[i]
if (element in b.elements) {
intersection.push(element)
}
}
return new lunr.Set (intersection)
}
/**
* Returns a new set combining the elements of this and the specified set.
*
* @param {lunr.Set} other - set to union with this set.
* @return {lunr.Set} a new set that is the union of this and the specified set.
*/
lunr.Set.prototype.union = function (other) {
if (other === lunr.Set.complete) {
return lunr.Set.complete
}
if (other === lunr.Set.empty) {
return this
}
return new lunr.Set(Object.keys(this.elements).concat(Object.keys(other.elements)))
}
/**
* A function to calculate the inverse document frequency for
* a posting. This is shared between the builder and the index
*
* @private
* @param {object} posting - The posting for a given term
* @param {number} documentCount - The total number of documents.
*/
lunr.idf = function (posting, documentCount) {
var documentsWithTerm = 0
for (var fieldName in posting) {
if (fieldName == '_index') continue // Ignore the term index, its not a field
documentsWithTerm = Object.keys(posting[fieldName]).length
}
var x = (documentCount - documentsWithTerm 0.5) / (documentsWithTerm 0.5)
return Math.log(1 Math.abs(x))
}
/**
* A token wraps a string representation of a token
* as it is passed through the text processing pipeline.
*
* @constructor
* @param {string} [str=''] - The string token being wrapped.
* @param {object} [metadata={}] - Metadata associated with this token.
*/
lunr.Token = function (str, metadata) {
this.str = str || ""
this.metadata = metadata || {}
}
/**
* Returns the token string that is being wrapped by this object.
*
* @returns {string}
*/
lunr.Token.prototype.toString = function () {
return this.str
}
/**
* A token update function is used when updating or optionally
* when cloning a token.
*
* @callback lunr.Token~updateFunction
* @param {string} str - The string representation of the token.
* @param {Object} metadata - All metadata associated with this token.
*/
/**
* Applies the given function to the wrapped string token.
*
* @example
* token.update(function (str, metadata) {
* return str.toUpperCase()
* })
*
* @param {lunr.Token~updateFunction} fn - A function to apply to the token string.
* @returns {lunr.Token}
*/
lunr.Token.prototype.update = function (fn) {
this.str = fn(this.str, this.metadata)
return this
}
/**
* Creates a clone of this token. Optionally a function can be
* applied to the cloned token.
*
* @param {lunr.Token~updateFunction} [fn] - An optional function to apply to the cloned token.
* @returns {lunr.Token}
*/
lunr.Token.prototype.clone = function (fn) {
fn = fn || function (s) { return s }
return new lunr.Token (fn(this.str, this.metadata), this.metadata)
}
/*!
* lunr.tokenizer
* Copyright (C) 2020 Oliver Nightingale
*/
/**
* A function for splitting a string into tokens ready to be inserted into
* the search index. Uses `lunr.tokenizer.separator` to split strings, change
* the value of this property to change how strings are split into tokens.
*
* This tokenizer will convert its parameter to a string by calling `toString` and
* then will split this string on the character in `lunr.tokenizer.separator`.
* Arrays will have their elements converted to strings and wrapped in a lunr.Token.
*
* Optional metadata can be passed to the tokenizer, this metadata will be cloned and
* added as metadata to every token that is created from the object to be tokenized.
*
* @static
* @param {?(string|object|object[])} obj - The object to convert into tokens
* @param {?object} metadata - Optional metadata to associate with every token
* @returns {lunr.Token[]}
* @see {@link lunr.Pipeline}
*/
lunr.tokenizer = function (obj, metadata) {
if (obj == null || obj == undefined) {
return []
}
if (Array.isArray(obj)) {
return obj.map(function (t) {
return new lunr.Token(
lunr.utils.asString(t).toLowerCase(),
lunr.utils.clone(metadata)
)
})
}
var str = obj.toString().toLowerCase(),
len = str.length,
tokens = []
for (var sliceEnd = 0, sliceStart = 0; sliceEnd <= len; sliceEnd ) {
var char = str.charAt(sliceEnd),
sliceLength = sliceEnd - sliceStart
if ((char.match(lunr.tokenizer.separator) || sliceEnd == len)) {
if (sliceLength > 0) {
var tokenMetadata = lunr.utils.clone(metadata) || {}
tokenMetadata["position"] = [sliceStart, sliceLength]
tokenMetadata["index"] = tokens.length
tokens.push(
new lunr.Token (
str.slice(sliceStart, sliceEnd),
tokenMetadata
)
)
}
sliceStart = sliceEnd 1
}
}
return tokens
}
/**
* The separator used to split a string into tokens. Override this property to change the behaviour of
* `lunr.tokenizer` behaviour when tokenizing strings. By default this splits on whitespace and hyphens.
*
* @static
* @see lunr.tokenizer
*/
lunr.tokenizer.separator = /[\s\-] /
/*!
* lunr.Pipeline
* Copyright (C) 2020 Oliver Nightingale
*/
/**
* lunr.Pipelines maintain an ordered list of functions to be applied to all
* tokens in documents entering the search index and queries being ran against
* the index.
*
* An instance of lunr.Index created with the lunr shortcut will contain a
* pipeline with a stop word filter and an English language stemmer. Extra
* functions can be added before or after either of these functions or these
* default functions can be removed.
*
* When run the pipeline will call each function in turn, passing a token, the
* index of that token in the original list of all tokens and finally a list of
* all the original tokens.
*
* The output of functions in the pipeline will be passed to the next function
* in the pipeline. To exclude a token from entering the index the function
* should return undefined, the rest of the pipeline will not be called with
* this token.
*
* For serialisation of pipelines to work, all functions used in an instance of
* a pipeline should be registered with lunr.Pipeline. Registered functions can
* then be loaded. If trying to load a serialised pipeline that uses functions
* that are not registered an error will be thrown.
*
* If not planning on serialising the pipeline then registering pipeline functions
* is not necessary.
*
* @constructor
*/
lunr.Pipeline = function () {
this._stack = []
}
lunr.Pipeline.registeredFunctions = Object.create(null)
/**
* A pipeline function maps lunr.Token to lunr.Token. A lunr.Token contains the token
* string as well as all known metadata. A pipeline function can mutate the token string
* or mutate (or add) metadata for a given token.
*
* A pipeline function can indicate that the passed token should be discarded by returning
* null, undefined or an empty string. This token will not be passed to any downstream pipeline
* functions and will not be added to the index.
*
* Multiple tokens can be returned by returning an array of tokens. Each token will be passed
* to any downstream pipeline functions and all will returned tokens will be added to the index.
*
* Any number of pipeline functions may be chained together using a lunr.Pipeline.
*
* @interface lunr.PipelineFunction
* @param {lunr.Token} token - A token from the document being processed.
* @param {number} i - The index of this token in the complete list of tokens for this document/field.
* @param {lunr.Token[]} tokens - All tokens for this document/field.
* @returns {(?lunr.Token|lunr.Token[])}
*/
/**
* Register a function with the pipeline.
*
* Functions that are used in the pipeline should be registered if the pipeline
* needs to be serialised, or a serialised pipeline needs to be loaded.
*
* Registering a function does not add it to a pipeline, functions must still be
* added to instances of the pipeline for them to be used when running a pipeline.
*
* @param {lunr.PipelineFunction} fn - The function to check for.
* @param {String} label - The label to register this function with
*/
lunr.Pipeline.registerFunction = function (fn, label) {
if (label in this.registeredFunctions) {
lunr.utils.warn('Overwriting existing registered function: ' label)
}
fn.label = label
lunr.Pipeline.registeredFunctions[fn.label] = fn
}
/**
* Warns if the function is not registered as a Pipeline function.
*
* @param {lunr.PipelineFunction} fn - The function to check for.
* @private
*/
lunr.Pipeline.warnIfFunctionNotRegistered = function (fn) {
var isRegistered = fn.label && (fn.label in this.registeredFunctions)
if (!isRegistered) {
lunr.utils.warn('Function is not registered with pipeline. This may cause problems when serialising the index.\n', fn)
}
}
/**
* Loads a previously serialised pipeline.
*
* All functions to be loaded must already be registered with lunr.Pipeline.
* If any function from the serialised data has not been registered then an
* error will be thrown.
*
* @param {Object} serialised - The serialised pipeline to load.
* @returns {lunr.Pipeline}
*/
lunr.Pipeline.load = function (serialised) {
var pipeline = new lunr.Pipeline
serialised.forEach(function (fnName) {
var fn = lunr.Pipeline.registeredFunctions[fnName]
if (fn) {
pipeline.add(fn)
} else {
throw new Error('Cannot load unregistered function: ' fnName)
}
})
return pipeline
}
/**
* Adds new functions to the end of the pipeline.
*
* Logs a warning if the function has not been registered.
*
* @param {lunr.PipelineFunction[]} functions - Any number of functions to add to the pipeline.
*/
lunr.Pipeline.prototype.add = function () {
var fns = Array.prototype.slice.call(arguments)
fns.forEach(function (fn) {
lunr.Pipeline.warnIfFunctionNotRegistered(fn)
this._stack.push(fn)
}, this)
}
/**
* Adds a single function after a function that already exists in the
* pipeline.
*
* Logs a warning if the function has not been registered.
*
* @param {lunr.PipelineFunction} existingFn - A function that already exists in the pipeline.
* @param {lunr.PipelineFunction} newFn - The new function to add to the pipeline.
*/
lunr.Pipeline.prototype.after = function (existingFn, newFn) {
lunr.Pipeline.warnIfFunctionNotRegistered(newFn)
var pos = this._stack.indexOf(existingFn)
if (pos == -1) {
throw new Error('Cannot find existingFn')
}
pos = pos 1
this._stack.splice(pos, 0, newFn)
}
/**
* Adds a single function before a function that already exists in the
* pipeline.
*
* Logs a warning if the function has not been registered.
*
* @param {lunr.PipelineFunction} existingFn - A function that already exists in the pipeline.
* @param {lunr.PipelineFunction} newFn - The new function to add to the pipeline.
*/
lunr.Pipeline.prototype.before = function (existingFn, newFn) {
lunr.Pipeline.warnIfFunctionNotRegistered(newFn)
var pos = this._stack.indexOf(existingFn)
if (pos == -1) {
throw new Error('Cannot find existingFn')
}
this._stack.splice(pos, 0, newFn)
}
/**
* Removes a function from the pipeline.
*
* @param {lunr.PipelineFunction} fn The function to remove from the pipeline.
*/
lunr.Pipeline.prototype.remove = function (fn) {
var pos = this._stack.indexOf(fn)
if (pos == -1) {
return
}
this._stack.splice(pos, 1)
}
/**
* Runs the current list of functions that make up the pipeline against the
* passed tokens.
*
* @param {Array} tokens The tokens to run through the pipeline.
* @returns {Array}
*/
lunr.Pipeline.prototype.run = function (tokens) {
var stackLength = this._stack.length
for (var i = 0; i < stackLength; i ) {
var fn = this._stack[i]
var memo = []
for (var j = 0; j < tokens.length; j ) {
var result = fn(tokens[j], j, tokens)
if (result === null || result === void 0 || result === '') continue
if (Array.isArray(result)) {
for (var k = 0; k < result.length; k ) {
memo.push(result[k])
}
} else {
memo.push(result)
}
}
tokens = memo
}
return tokens
}
/**
* Convenience method for passing a string through a pipeline and getting
* strings out. This method takes care of wrapping the passed string in a
* token and mapping the resulting tokens back to strings.
*
* @param {string} str - The string to pass through the pipeline.
* @param {?object} metadata - Optional metadata to associate with the token
* passed to the pipeline.
* @returns {string[]}
*/
lunr.Pipeline.prototype.runString = function (str, metadata) {
var token = new lunr.Token (str, metadata)
return this.run([token]).map(function (t) {
return t.toString()
})
}
/**
* Resets the pipeline by removing any existing processors.
*
*/
lunr.Pipeline.prototype.reset = function () {
this._stack = []
}
/**
* Returns a representation of the pipeline ready for serialisation.
*
* Logs a warning if the function has not been registered.
*
* @returns {Array}
*/
lunr.Pipeline.prototype.toJSON = function () {
return this._stack.map(function (fn) {
lunr.Pipeline.warnIfFunctionNotRegistered(fn)
return fn.label
})
}
/*!
* lunr.Vector
* Copyright (C) 2020 Oliver Nightingale
*/
/**
* A vector is used to construct the vector space of documents and queries. These
* vectors support operations to determine the similarity between two documents or
* a document and a query.
*
* Normally no parameters are required for initializing a vector, but in the case of
* loading a previously dumped vector the raw elements can be provided to the constructor.
*
* For performance reasons vectors are implemented with a flat array, where an elements
* index is immediately followed by its value. E.g. [index, value, index, value]. This
* allows the underlying array to be as sparse as possible and still offer decent
* performance when being used for vector calculations.
*
* @constructor
* @param {Number[]} [elements] - The flat list of element index and element value pairs.
*/
lunr.Vector = function (elements) {
this._magnitude = 0
this.elements = elements || []
}
/**
* Calculates the position within the vector to insert a given index.
*
* This is used internally by insert and upsert. If there are duplicate indexes then
* the position is returned as if the value for that index were to be updated, but it
* is the callers responsibility to check whether there is a duplicate at that index
*
* @param {Number} insertIdx - The index at which the element should be inserted.
* @returns {Number}
*/
lunr.Vector.prototype.positionForIndex = function (index) {
// For an empty vector the tuple can be inserted at the beginning
if (this.elements.length == 0) {
return 0
}
var start = 0,
end = this.elements.length / 2,
sliceLength = end - start,
pivotPoint = Math.floor(sliceLength / 2),
pivotIndex = this.elements[pivotPoint * 2]
while (sliceLength > 1) {
if (pivotIndex < index) {
start = pivotPoint
}
if (pivotIndex > index) {
end = pivotPoint
}
if (pivotIndex == index) {
break
}
sliceLength = end - start
pivotPoint = start Math.floor(sliceLength / 2)
pivotIndex = this.elements[pivotPoint * 2]
}
if (pivotIndex == index) {
return pivotPoint * 2
}
if (pivotIndex > index) {
return pivotPoint * 2
}
if (pivotIndex < index) {
return (pivotPoint 1) * 2
}
}
/**
* Inserts an element at an index within the vector.
*
* Does not allow duplicates, will throw an error if there is already an entry
* for this index.
*
* @param {Number} insertIdx - The index at which the element should be inserted.
* @param {Number} val - The value to be inserted into the vector.
*/
lunr.Vector.prototype.insert = function (insertIdx, val) {
this.upsert(insertIdx, val, function () {
throw "duplicate index"
})
}
/**
* Inserts or updates an existing index within the vector.
*
* @param {Number} insertIdx - The index at which the element should be inserted.
* @param {Number} val - The value to be inserted into the vector.
* @param {function} fn - A function that is called for updates, the existing value and the
* requested value are passed as arguments
*/
lunr.Vector.prototype.upsert = function (insertIdx, val, fn) {
this._magnitude = 0
var position = this.positionForIndex(insertIdx)
if (this.elements[position] == insertIdx) {
this.elements[position 1] = fn(this.elements[position 1], val)
} else {
this.elements.splice(position, 0, insertIdx, val)
}
}
/**
* Calculates the magnitude of this vector.
*
* @returns {Number}
*/
lunr.Vector.prototype.magnitude = function () {
if (this._magnitude) return this._magnitude
var sumOfSquares = 0,
elementsLength = this.elements.length
for (var i = 1; i < elementsLength; i = 2) {
var val = this.elements[i]
sumOfSquares = val * val
}
return this._magnitude = Math.sqrt(sumOfSquares)
}
/**
* Calculates the dot product of this vector and another vector.
*
* @param {lunr.Vector} otherVector - The vector to compute the dot product with.
* @returns {Number}
*/
lunr.Vector.prototype.dot = function (otherVector) {
var dotProduct = 0,
a = this.elements, b = otherVector.elements,
aLen = a.length, bLen = b.length,
aVal = 0, bVal = 0,
i = 0, j = 0
while (i < aLen && j < bLen) {
aVal = a[i], bVal = b[j]
if (aVal < bVal) {
i = 2
} else if (aVal > bVal) {
j = 2
} else if (aVal == bVal) {
dotProduct = a[i 1] * b[j 1]
i = 2
j = 2
}
}
return dotProduct
}
/**
* Calculates the similarity between this vector and another vector.
*
* @param {lunr.Vector} otherVector - The other vector to calculate the
* similarity with.
* @returns {Number}
*/
lunr.Vector.prototype.similarity = function (otherVector) {
return this.dot(otherVector) / this.magnitude() || 0
}
/**
* Converts the vector to an array of the elements within the vector.
*
* @returns {Number[]}
*/
lunr.Vector.prototype.toArray = function () {
var output = new Array (this.elements.length / 2)
for (var i = 1, j = 0; i < this.elements.length; i = 2, j ) {
output[j] = this.elements[i]
}
return output
}
/**
* A JSON serializable representation of the vector.
*
* @returns {Number[]}
*/
lunr.Vector.prototype.toJSON = function () {
return this.elements
}
/* eslint-disable */
/*!
* lunr.stemmer
* Copyright (C) 2020 Oliver Nightingale
* Includes code from - http://tartarus.org/~martin/PorterStemmer/js.txt
*/
/**
* lunr.stemmer is an english language stemmer, this is a JavaScript
* implementation of the PorterStemmer taken from http://tartarus.org/~martin
*
* @static
* @implements {lunr.PipelineFunction}
* @param {lunr.Token} token - The string to stem
* @returns {lunr.Token}
* @see {@link lunr.Pipeline}
* @function
*/
lunr.stemmer = (function(){
var step2list = {
"ational" : "ate",
"tional" : "tion",
"enci" : "ence",
"anci" : "ance",
"izer" : "ize",
"bli" : "ble",
"alli" : "al",
"entli" : "ent",
"eli" : "e",
"ousli" : "ous",
"ization" : "ize",
"ation" : "ate",
"ator" : "ate",
"alism" : "al",
"iveness" : "ive",
"fulness" : "ful",
"ousness" : "ous",
"aliti" : "al",
"iviti" : "ive",
"biliti" : "ble",
"logi" : "log"
},
step3list = {
"icate" : "ic",
"ative" : "",
"alize" : "al",
"iciti" : "ic",
"ical" : "ic",
"ful" : "",
"ness" : ""
},
c = "[^aeiou]", // consonant
v = "[aeiouy]", // vowel
C = c "[^aeiouy]*", // consonant sequence
V = v "[aeiou]*", // vowel sequence
mgr0 = "^(" C ")?" V C, // [C]VC... is m>0
meq1 = "^(" C ")?" V C "(" V ")?$", // [C]VC[V] is m=1
mgr1 = "^(" C ")?" V C V C, // [C]VCVC... is m>1
s_v = "^(" C ")?" v; // vowel in stem
var re_mgr0 = new RegExp(mgr0);
var re_mgr1 = new RegExp(mgr1);
var re_meq1 = new RegExp(meq1);
var re_s_v = new RegExp(s_v);
var re_1a = /^(. ?)(ss|i)es$/;
var re2_1a = /^(. ?)([^s])s$/;
var re_1b = /^(. ?)eed$/;
var re2_1b = /^(. ?)(ed|ing)$/;