77 lines
2.2 KiB
JavaScript
77 lines
2.2 KiB
JavaScript
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/*!
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* lunr.tokenizer
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* Copyright (C) @YEAR Oliver Nightingale
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*/
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/**
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* A function for splitting a string into tokens ready to be inserted into
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* the search index. Uses `lunr.tokenizer.separator` to split strings, change
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* the value of this property to change how strings are split into tokens.
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*
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* This tokenizer will convert its parameter to a string by calling `toString` and
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* then will split this string on the character in `lunr.tokenizer.separator`.
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* Arrays will have their elements converted to strings and wrapped in a lunr.Token.
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*
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* Optional metadata can be passed to the tokenizer, this metadata will be cloned and
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* added as metadata to every token that is created from the object to be tokenized.
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*
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* @static
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* @param {?(string|object|object[])} obj - The object to convert into tokens
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* @param {?object} metadata - Optional metadata to associate with every token
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* @returns {lunr.Token[]}
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* @see {@link lunr.Pipeline}
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*/
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lunr.tokenizer = function (obj, metadata) {
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if (obj == null || obj == undefined) {
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return []
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}
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if (Array.isArray(obj)) {
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return obj.map(function (t) {
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return new lunr.Token(
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lunr.utils.asString(t).toLowerCase(),
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lunr.utils.clone(metadata)
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)
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})
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}
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var str = obj.toString().toLowerCase(),
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len = str.length,
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tokens = []
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for (var sliceEnd = 0, sliceStart = 0; sliceEnd <= len; sliceEnd++) {
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var char = str.charAt(sliceEnd),
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sliceLength = sliceEnd - sliceStart
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if ((char.match(lunr.tokenizer.separator) || sliceEnd == len)) {
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if (sliceLength > 0) {
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var tokenMetadata = lunr.utils.clone(metadata) || {}
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tokenMetadata["position"] = [sliceStart, sliceLength]
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tokenMetadata["index"] = tokens.length
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tokens.push(
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new lunr.Token (
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str.slice(sliceStart, sliceEnd),
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tokenMetadata
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)
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)
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}
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sliceStart = sliceEnd + 1
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}
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}
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return tokens
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}
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/**
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* The separator used to split a string into tokens. Override this property to change the behaviour of
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* `lunr.tokenizer` behaviour when tokenizing strings. By default this splits on whitespace and hyphens.
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*
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* @static
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* @see lunr.tokenizer
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*/
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lunr.tokenizer.separator = /[\s\-]+/
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