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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
};
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