Write bangla Unicode in bijoy rule without installing bijoy software

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Introduction 

Unicode is a computing industry standard for the consistent encoding, representation and handling of text expressed in most of the world's writing systems. it is the insertion of a specific Unicode character on a computer by a user  

Unicode characters can be inserted in two ways: from the screen by means of an applet from which one can select the character, or by certain key sequence on the keyboard. Many systems provide support for Unicode input in some form. 

Unicode input system should provide a large repertoire of characters, ideally, all valid Unicode code points. This is different from a keyboard layout which defines keys and their combinations only for a limited number of characters appropriate for a certain locale.  

Bangla Vowels 

 The Bengali vowel letter is called shoroborno (স্বরবর্ণ ). These shoroborno represent six of the seven main vowel sounds of Bengali, along with two vowel diphthongs. All of these are used in both Bengali and Assamese 

Bangla Consonants 

Consonant letters are called benjonborno( ব্যঞ্জনবর্ণ ) in Bengali. The names of these letters are typically just the consonant sound plus the inherent vowel. 

Bangla vowels and consonants more information is here. 

Bangla Unicode Writing System  

Suppose, I want to write: আমি বাংলাদেশকে ভালবাসি,আপনি ?According to bijoy writing system we have to write like this: 

অ া ি ম ব া ং ল া ে দ শ ে ক ভ া ল ব া ি স , অ া প ি ন ? 

The result will show: আিম বাংলােদশেক ভালবািস, আপিন ? (According to Unicode rule, this is right)

To get expected result we have to write like this:

অ া ম ি ব া ং ল া দ ে শ ক ে ভ া ল ব া স ি , অ া প ন ি ?

That is not practice in bijoy rule. 

Unicode is joining Bengali vowels (স্বরবর্ণ shoroborno) and Bengali consonants (ব্যঞ্জনবর্ণ benjonborno) in rules like that:

Consonants (ব্যঞ্জনবর্ণ) + vowels (স্বরবর্ণ)

অ + া = আ

প + ি = পি

স + ে = সে

The vowels are joining with consonants with given attributes by Unicode. For that when we write according to bijoy rules, the generated result is showing different result. 

Unicode chart for Bangla 

Bangla Unicode has own hexadecimal range which is 0x0980-0x09FF. So, All Bangla character is assigned within the given range.  

Like for:   

অ = u0985

আ = u0986

ক = u0995 

খ = u0996  Etc. The chart details is here 

Bangla vowels and consonants more information is here. 

Code Analysis  

There are some array which stores the Unicode characters with code. 

//the word those are use before-character
unijoy['j'] = "\u0995"; // koo
unijoy['d'] = '\u09BF'; // hrossho i kar
unijoy['gd'] = '\u0987'; // hrossho i
unijoy['D'] = '\u09C0'; // dirgho i kar
unijoy['gD'] = '\u0988'; // dirgho i

  

Also stores the vowels which are use to join before consonants. The vowels are: rshi-kar(`ি-কার),  e-kar(`ে- কার),oi-kar(`ৈ- কার )

hr_post_array[0] = 'f'; // e kar
hr_post_array[1] = 'D'; //Oi Kar
hr_post_array[2] = 'X'; // hrossho i kar
hr_post_array[3] = 'Z'; // hrossho i kar

When a key pressed in keyboard then at first the key is checked in unijoy[] array which contains the list of Unicode returns the uni-character. Now, when a uni-character is vowels type then its joining with consonants according to its characteristics.

//----------------------------------------------Check the bangla pre-vowel-------
function Check_Pre_Character_Exist(p_char) {
 
    var tag_found = 0;
    for (var p_char_index = 0; p_char_index < rashed_swap_array.length; p_char_index++) {
 
        if (rashed_swap_array[p_char_index].toString() == p_char) {
            tag_found = 1;
            return tag_found;
        }
    }
    return tag_found;
}  

  But problem is when a vowel which joined in before of consonants comes, then according to its characteristics join with previous consonants. so I used '`' character to make distance between the consonants and vowels. like: হ`ি.  

  var hr_post_array = new Array(); 

if (Check_Pre_Character_Exist(get_unicode_to_character_rashed(myValue)) == 1) {
            // if user change the cursor and give e-kar in front of any character then
            if (myField.value.substring(startPos, startPos + 1) == ' '
                || myField.value.substring(startPos, startPos + 1) == '') {
                myField.value = myField.value.substring(0, startPos)
                        + '`'
                        + myValue
		                + myField.value.substring(endPos, myField.value.length);
            }
            else {
                myField.value = myField.value.substring(0, startPos + 1)
                    + myValue
                    + myField.value.substring(startPos + 1);
            }
        } 

else if (Check_Pre_Character_Exist(carry_rashed.substring(0, 1))) {
   if (myField.value.substring(startPos - 2, startPos - 1) == '`') {
               myField.value = myField.value.substring(0, startPos - 2)
                   + myValue
                   + myField.value.substring(startPos - 1, startPos)
                   + myField.value.substring(endPos, myField.value.length);
               }
   else {
               myField.value = myField.value.substring(0, startPos - 1)
               + myValue
               + myField.value.substring(startPos - 1, startPos) + myField.value.substring(endPos, myField.value.length);
           }
       }

That means I have to add next consonants with rshi-kar(`ি-কার). before adding a consonants first check its environment that which character already before. So, when the consonants find pre-vowels(e-kar,rshi-kar,oi-kar) then it just alter the position and makes expected result. Suppose, I want to add 'ক' now. then the logical position becomes: হ`ি +ক =হক  `ি  = হকি 

The others joining of vowel in same structure. 

Combined Joining 

if (myField.value.substring(startPos - 1, startPos) != ' ') {
                if (carry_rashed.substring(1, 2) == 'g') {
                    myField.value = myField.value.substring(0, startPos)
		            + myValue
		            + myField.value.substring(endPos, myField.value.length);
                }
                else {
 
                    if (carry_rashed.substring(0, 1) == 'g') {
                        if (Check_Pre_Character_Exist(get_unicode_to_character_rashed(myField.value.substring(startPos - 2, startPos - 1))) == 1) {
                            myField.value = myField.value.substring(0, startPos - 2)
		                + myField.value.substring(startPos - 1, startPos)
                        + myValue
		                + myField.value.substring(startPos - 2, startPos - 1)
		                + myField.value.substring(endPos, myField.value.length);
                        }
                        else {
                            myField.value = myField.value.substring(0, startPos)
		                    + myValue
		                    + myField.value.substring(endPos, myField.value.length);
                        }
                    }
                    else {
                        myField.value = myField.value.substring(0, startPos)
		                    + myValue
		                    + myField.value.substring(endPos, myField.value.length);
                    }
 
                } 

else if (char_e == "A") {
        newChar = unijoy['v'] + '\u09CD' + lastInserted;
        var value_field = "";
 
        var startPos = myField.selectionStart;
 
        var last_fifth_one = myField.value.substring(startPos - 5, startPos - 4);
        var last_forth_one = myField.value.substring(startPos - 4, startPos - 3);
        var last_third_one = myField.value.substring(startPos - 3, startPos - 2);
        var last_second_one = myField.value.substring(startPos - 2, startPos - 1);
        var last_one = myField.value.substring(startPos - 1, startPos);
 
 
        //
        // if character[last] is character: gorto, 
        //
        if (Check_Character_Exist_orNot(get_unicode_to_character_rashed(last_one)) == 0) {
 
            // if last previous one is g then "ref" add with (g-1) located character
            if (get_unicode_to_character_rashed(last_second_one) == 'g') {
                newChar = unijoy['v'] + '\u09CD' + last_third_one + last_second_one + last_one;
                myField.value = myField.value.substring(0, startPos - 4) + myField.value.substring(startPos - 4, startPos - 3) + newChar;
            }
            else {
                newChar = unijoy['v'] + '\u09CD' + last_one;
                myField.value = myField.value.substring(0, startPos - 2) + myField.value.substring(startPos - 2, startPos - 1) + newChar;
            }
        }
        else {
            if (Check_Character_Exist_orNot(get_unicode_to_character_rashed(last_second_one)) == 1) {
                if (get_unicode_to_character_rashed(last_forth_one) == 'g') {
                    newChar = unijoy['v'] + '\u09CD'+ last_fifth_one+ last_forth_one + last_third_one + last_second_one + last_one;
                    myField.value = myField.value.substring(0, startPos - 6) + myField.value.substring(startPos - 6, startPos - 5) + newChar;
                  
                }
                else {
                    newChar = unijoy['v'] + '\u09CD' + last_third_one + last_second_one + last_one;
                    myField.value = myField.value.substring(0, startPos - 4) + myField.value.substring(startPos - 4, startPos - 3) + newChar;
                }
            }
            else {
                // alert(last_forth_one + ' ' + last_third_one + ' ' + last_second_one + ' ' + last_one);
                //example: gorde
                if (get_unicode_to_character_rashed(last_third_one) == 'g') {
                    newChar = unijoy['v'] + '\u09CD'+last_forth_one + last_third_one + last_second_one + last_one;
                    myField.value = myField.value.substring(0, startPos - 5) + myField.value.substring(startPos - 5, startPos - 4) + newChar;
                }
                else {
                    newChar = unijoy['v'] + '\u09CD' + last_second_one + last_one;
                    myField.value = myField.value.substring(0, startPos - 3) + myField.value.substring(startPos - 3, startPos - 2) + newChar;
                }
            }
 
        }
       
        return false;
    }