// // tapliterate.js - Tapioca Transliteration module // Convert Manglish to Malayalam Unicode // // (c) 2003-2006 Thomas P John // See Tapioca copyright page for further details // // system constants. defined var since I can't find const keyword in js var T_NONE = 0; // no real type. ZWJ, ZWNJ etc are grouped as T_NONE var T_VOWEL = 1; // vowels var T_CONSONANT = 2; // normal consonants var T_CHILLUCONSONANT = 3; // chillu forming consonants. See ischillu() for list var T_SPECIALS = 4; // special characters like anusvara etc. // system variables & diversity var conf_midchillu = false; // if true, handles chillu forming consonants in their chill form // in the middle of a word. Varamozhi does it this way which is // extremely convenient. However, it requires some additional // logic (which I havent figured out yet) to still allow formation // of koottaksharams involving chillu consonants (e.g. NT) // therefore, set false by default // ischillu(c): returns true if c is a chillu forming consonant character // at present are 5 chillu forming characters in malayalam // 0x0d23 - N, 0x0d2e - m, 0x0d30 - r, 0x0d32 - l, 0x0d33 - L // 0x0D28 - m is a special case. Anusvara is considered chillu of m function ischillu(c) { return (c=="ന") || (c=="മ") || (c=="ര") || (c=="ല") || (c=="ള") || (c=="ണ"); } // isspace(c): returns true if c is a word delimiter // hyphen is considered a word delimiter. So is ZWJ function isspace(c) { return (c==' ') || (c=='.') || (c==',') || (c==';') || (c==';') || (c=='/') || (c=='\\') || (c=='-') || (c=='_'); } function xlit_to_mal(s) { var sl = s.length; // length of above string var i = 0; // index for while loop var tvi = new String(""); // current matched token value independent var tvd = new String(""); // current matched token value dependent var tl = 0; // current matched token length var ttype = 0; // current matched token type var pvi = 0; // previous matched token value independent var ptype = 0; // previous matched token type var oo = new String(""); // output (xlited) string var ss = ""; // substring of s being parsed var startword = 1; // bool starting of a word var endword = 0; // bool ending of a word while(i= sl || isspace(s.charAt(i+tl))) endword=1; // check if end word if(!startword && tvd != "") tvi=tvd; // RULE #1 if(!startword && tvi=="അ") {} // RULE #2 else if((ptype==T_CONSONANT || ptype==T_CHILLUCONSONANT) && // RULE #3 (ttype==T_CONSONANT || ttype==T_CHILLUCONSONANT)) { if((pvi!=tvi) && ischillu(pvi) && conf_midchillu) // RULE #3B (disabled) { oo+= "്"; // chandrakkala oo+= "‍"; // ZWJ oo+= tvi; // current char } else { oo+= "്"; // chandrakkala oo+= tvi; // current char } } else if(tvi.search(/[A-Za-z]/)!=0) oo+=tvi; if(endword && (ttype==T_CONSONANT || ttype==T_CHILLUCONSONANT)) // RULE #5 { oo+= "്"; if(ischillu(tvi)) oo+= "‍"; // RULE #5A } endword=0; if(isspace(tvi)) // if current token is delimiter, flag new word starting { startword = 1; ptype=T_NONE; } else startword = 0; i+=tl; // increment current pointer to next token start ptype=ttype; // store current token type as previous pvi=tvi; // store current token value as previous } return oo.replace(/മ്‍/ig,"ം"); }