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lunr.stemmer.support.js
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lunr.stemmer.support.js
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/*!
* Snowball JavaScript Library v0.3
* http://code.google.com/p/urim/
* http://snowball.tartarus.org/
*
* Copyright 2010, Oleg Mazko
* http://www.mozilla.org/MPL/
*/
/**
* export the module via AMD, CommonJS or as a browser global
* Export code from https://github.com/umdjs/umd/blob/master/returnExports.js
*/
;(function (root, factory) {
if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module.
define(factory)
} else if (typeof exports === 'object') {
/**
* Node. Does not work with strict CommonJS, but
* only CommonJS-like environments that support module.exports,
* like Node.
*/
module.exports = factory()
} else {
// Browser globals (root is window)
factory()(root.lunr);
}
}(this, function () {
/**
* Just return a value to define the module export.
* This example returns an object, but the module
* can return a function as the exported value.
*/
return function(lunr) {
/* provides utilities for the included stemmers */
lunr.stemmerSupport = {
Among: function(s, substring_i, result, method) {
this.toCharArray = function(s) {
var sLength = s.length, charArr = new Array(sLength);
for (var i = 0; i < sLength; i++)
charArr[i] = s.charCodeAt(i);
return charArr;
};
if ((!s && s != "") || (!substring_i && (substring_i != 0)) || !result)
throw ("Bad Among initialisation: s:" + s + ", substring_i: "
+ substring_i + ", result: " + result);
this.s_size = s.length;
this.s = this.toCharArray(s);
this.substring_i = substring_i;
this.result = result;
this.method = method;
},
SnowballProgram: function() {
var current;
return {
bra : 0,
ket : 0,
limit : 0,
cursor : 0,
limit_backward : 0,
setCurrent : function(word) {
current = word;
this.cursor = 0;
this.limit = word.length;
this.limit_backward = 0;
this.bra = this.cursor;
this.ket = this.limit;
},
getCurrent : function() {
var result = current;
current = null;
return result;
},
in_grouping : function(s, min, max) {
if (this.cursor < this.limit) {
var ch = current.charCodeAt(this.cursor);
if (ch <= max && ch >= min) {
ch -= min;
if (s[ch >> 3] & (0X1 << (ch & 0X7))) {
this.cursor++;
return true;
}
}
}
return false;
},
in_grouping_b : function(s, min, max) {
if (this.cursor > this.limit_backward) {
var ch = current.charCodeAt(this.cursor - 1);
if (ch <= max && ch >= min) {
ch -= min;
if (s[ch >> 3] & (0X1 << (ch & 0X7))) {
this.cursor--;
return true;
}
}
}
return false;
},
out_grouping : function(s, min, max) {
if (this.cursor < this.limit) {
var ch = current.charCodeAt(this.cursor);
if (ch > max || ch < min) {
this.cursor++;
return true;
}
ch -= min;
if (!(s[ch >> 3] & (0X1 << (ch & 0X7)))) {
this.cursor++;
return true;
}
}
return false;
},
out_grouping_b : function(s, min, max) {
if (this.cursor > this.limit_backward) {
var ch = current.charCodeAt(this.cursor - 1);
if (ch > max || ch < min) {
this.cursor--;
return true;
}
ch -= min;
if (!(s[ch >> 3] & (0X1 << (ch & 0X7)))) {
this.cursor--;
return true;
}
}
return false;
},
eq_s : function(s_size, s) {
if (this.limit - this.cursor < s_size)
return false;
for (var i = 0; i < s_size; i++)
if (current.charCodeAt(this.cursor + i) != s.charCodeAt(i))
return false;
this.cursor += s_size;
return true;
},
eq_s_b : function(s_size, s) {
if (this.cursor - this.limit_backward < s_size)
return false;
for (var i = 0; i < s_size; i++)
if (current.charCodeAt(this.cursor - s_size + i) != s
.charCodeAt(i))
return false;
this.cursor -= s_size;
return true;
},
find_among : function(v, v_size) {
var i = 0, j = v_size, c = this.cursor, l = this.limit, common_i = 0, common_j = 0, first_key_inspected = false;
while (true) {
var k = i + ((j - i) >> 1), diff = 0, common = common_i < common_j
? common_i
: common_j, w = v[k];
for (var i2 = common; i2 < w.s_size; i2++) {
if (c + common == l) {
diff = -1;
break;
}
diff = current.charCodeAt(c + common) - w.s[i2];
if (diff)
break;
common++;
}
if (diff < 0) {
j = k;
common_j = common;
} else {
i = k;
common_i = common;
}
if (j - i <= 1) {
if (i > 0 || j == i || first_key_inspected)
break;
first_key_inspected = true;
}
}
while (true) {
var w = v[i];
if (common_i >= w.s_size) {
this.cursor = c + w.s_size;
if (!w.method)
return w.result;
var res = w.method();
this.cursor = c + w.s_size;
if (res)
return w.result;
}
i = w.substring_i;
if (i < 0)
return 0;
}
},
find_among_b : function(v, v_size) {
var i = 0, j = v_size, c = this.cursor, lb = this.limit_backward, common_i = 0, common_j = 0, first_key_inspected = false;
while (true) {
var k = i + ((j - i) >> 1), diff = 0, common = common_i < common_j
? common_i
: common_j, w = v[k];
for (var i2 = w.s_size - 1 - common; i2 >= 0; i2--) {
if (c - common == lb) {
diff = -1;
break;
}
diff = current.charCodeAt(c - 1 - common) - w.s[i2];
if (diff)
break;
common++;
}
if (diff < 0) {
j = k;
common_j = common;
} else {
i = k;
common_i = common;
}
if (j - i <= 1) {
if (i > 0 || j == i || first_key_inspected)
break;
first_key_inspected = true;
}
}
while (true) {
var w = v[i];
if (common_i >= w.s_size) {
this.cursor = c - w.s_size;
if (!w.method)
return w.result;
var res = w.method();
this.cursor = c - w.s_size;
if (res)
return w.result;
}
i = w.substring_i;
if (i < 0)
return 0;
}
},
replace_s : function(c_bra, c_ket, s) {
var adjustment = s.length - (c_ket - c_bra), left = current
.substring(0, c_bra), right = current.substring(c_ket);
current = left + s + right;
this.limit += adjustment;
if (this.cursor >= c_ket)
this.cursor += adjustment;
else if (this.cursor > c_bra)
this.cursor = c_bra;
return adjustment;
},
slice_check : function() {
if (this.bra < 0 || this.bra > this.ket || this.ket > this.limit
|| this.limit > current.length)
throw ("faulty slice operation");
},
slice_from : function(s) {
this.slice_check();
this.replace_s(this.bra, this.ket, s);
},
slice_del : function() {
this.slice_from("");
},
insert : function(c_bra, c_ket, s) {
var adjustment = this.replace_s(c_bra, c_ket, s);
if (c_bra <= this.bra)
this.bra += adjustment;
if (c_bra <= this.ket)
this.ket += adjustment;
},
slice_to : function() {
this.slice_check();
return current.substring(this.bra, this.ket);
},
eq_v_b : function(s) {
return this.eq_s_b(s.length, s);
}
};
}
};
lunr.trimmerSupport = {
generateTrimmer: function(wordCharacters) {
var startRegex = new RegExp("^[^" + wordCharacters + "]+")
var endRegex = new RegExp("[^" + wordCharacters + "]+$")
return function(token) {
// for lunr version 2
if (typeof token.update === "function") {
return token.update(function (s) {
return s
.replace(startRegex, '')
.replace(endRegex, '');
})
} else { // for lunr version 1
return token
.replace(startRegex, '')
.replace(endRegex, '');
}
};
}
}
}
}));