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authorGeo Halkiadakis <gchalkiadakis@sklavenitis.co.gr>2024-04-17 18:32:13 +0300
committerGeo Halkiadakis <gchalkiadakis@sklavenitis.co.gr>2024-04-17 18:32:13 +0300
commitd9364679a51ff80db8e5948ab089d749da36a6b2 (patch)
treef847a03a017be8857923aaaae9f8dcf7177b2ba9 /utils/kb-util.js
parent6248d2cf7a2214ac32628bc58248694108b4d8bf (diff)
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-rw-r--r--utils/kb-util.js88
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diff --git a/utils/kb-util.js b/utils/kb-util.js
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-/**
- * fast string manipulation utilities
- * for bi-lingual (EL/EN) words/phrases
- * based on the keyboard layout
- */
-
-// suplamentary arrays (mostly for cache)
-// --- -- -- - - -
-
-var ORiGiNal = 'ςερτυθιοπασδφγηξκλζχψωβνμΕΡΤΥΘΙΟΠΑΣΔΦΓΗΞΚΛΖΧΨΩΒΝΜάέήίόύώϊΐϋΆΈΉΊΌΎΏΪΫQWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm0123456789- '.split('');
-
-var kbKeyZed = 'sertyuiopasdfghjklzxcvbnmertyuiopasdfghjklzxcvbnmaehioyviiyaehioyviyqwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnm0123456789- '.split('');
-
-var map = new Map();
-for (var i=0; i<ORiGiNal.length; i++) map.set(ORiGiNal[i], kbKeyZed[i]);
-
-
-// cache (=create a global array)
-// of accended to non-accended vowels mapping
-// --- -- -- - - -
-accented_vowels = [];
-[
- 'ά α', 'έ ε', 'ή η', 'ί ι', 'ϊ ι', 'ΐ ι', 'ό ο', 'ύ υ', 'ϋ υ', 'ώ ω',
- 'Ά Α', 'Έ Ε', 'Ή Η', 'Ί Ι', 'Ϊ Ι', 'Ό Ο', 'Ύ Υ', 'Ϋ Υ', 'Ώ Ω'
-].forEach( pair => {
- ap = pair.split(' ');
- accented_vowels.push({
- a: ap[0], // accented
- p: ap[1] // pure = non accended
- });
-});
-
-
-// translates string to keyboard-latin keys
-// (the ones that used whan typing each letter of the word)
-const keyboardize = (str) => {
- str = str.replace('\'','');
- var out = '';
- // [map]'s implementation is 40x faster than [for]'s
- for (var i=0 ; i< str.length; i++) out += map.get(str[i]);
- return out;
-}
-
-// keyboardize an array of strings
-const keyb_array = (arr) => {
- kb_arr = [];
- arr.forEach( w => {
- kb_arr.push(keyboardize(w));
- });
- return kb_arr;
-}
-
-
-// transforms to lowercase; handles sigma-teliko
-const sanitizeGR = (str) => {
- str = str.toLowerCase();
-
- // replace accended vowels with pure ones
- accented_vowels.forEach( v => {
- str = str.replaceAll(v.a, v.p);
- });
-
- // replace sigma on the end of words
- str = str + ' ';
- str = str.replaceAll('σ-', 'ς-');
- str = str.replaceAll('σ ', 'ς ');
-
- return str;
-}
-
-// removes non keyword characters [+ . , !] and internal multiple-spaces
-// @param txt (string): product description
-const clean = (txt) => {
- return txt.replace('+',' ').replace('.',' ').replace(',',' ') // change to space
- .replace('!','').replace('\"', '') // remove character
- .replace(' ',' ').replace(' ',' '); // remove multiple spaces
-}
-
-
-// exports
-// --- -- -- - - -
-
-module.exports = {
- keyboardize,
- keyb_array,
- sanitizeGR,
- clean
-}; \ No newline at end of file