README.emd

To implement this project، Java and the antlr parser are used inside it.
First, a 4G file representing the problem grammar is designed that the following grammar is:
grammar Narwhal;
prog: ( (stat | function)? (NEWLINE) )*
 ;
block: ( stat? NEWLINE )*
 ;
stat: PRINT value #print
 | ID '=' value #assign
 | ID '=' expression #exprAssign
 | READINT ID #readInt
 | READREAL ID #readReal
 | ID '()' #call
 | IF equal '{' blockif '}' #if
 | REPEAT repetitions '{' block '}' #repeat
 ;
value: ID
 | STRING
 | INT
 | REAL
 ;
expression: term ( ( add | sub ) term )*
 ;
term: factor ( ( mul | div ) factor )*
 ;
factor: lp expression rp #ex
 | INT #int
 | REAL #real
 | ID #id
 ;
lp: '('
 ;
rp: ')'
 ;
add: '+'
 ;
sub: '-'
 ;
mul: '*'
 ;
div: '/'
 ;
function: FUNCTION ID '()' '{' block '}'
 ;
equal: ID '==' INT
 ;
blockif: block
 ;
repetitions: ID
 ;
REPEAT: 'repeat'
 ;
IF: 'if'
 ;
FUNCTION: 'func'
 ;
READREAL: 'readReal'
 ;
READINT: 'readInt'
 ;
PRINT: 'print'
 ;
STRING: '"' ( ~('\\'|'"') )* '"'
 ;
ID: ('a'..'z'|'A'..'Z')+
 ;
INT: '0'..'9'+
 ;
REAL: '0'..'9'+'.''0'..'9'+
 ;
NEWLINE: '\r'? '\n'
 ;
WS: (' '|'\t')+ { skip(); }
 ;
This grammar has the ability to recognize numbers، letters، words، gems، addresses، important codes such as zip codes، etc. 
This grammar also has the ability to recognize decimal numbers, integers, etc. 
The way to write this grammar is to first all the requirements including numbers, letters, words, etc. 
They should be defined, for example, integers are defined as follows:INT: '0'..'9'+
After defining all the requirements، you need to add this 4G file inside the project so that the program can use it to produce and 
Use text recognition.
After adding the file to the project, the file must be written in the Java programming language that can receive the text and 
Using those necessary items such as zip code، email، and number، etc. Recognize it.

For example، in this part of the program، text is received and ready for diagnosis:

private String getValue(Value value, boolean isMathExpr) {
 if (isMathExpr) {
return value.content;
 }
 if (MathUtils.isNumeric(value.content)) {
 return value.content;
 } else {
 if (value.type == VarType.REAL) {
 LLVMGenerator.load_double(value.content, 
globalNames);
 } else {
 LLVMGenerator.load_i32(value.content, globalNames);
 }
 return "%" + (LLVMGenerator.reg - 1);
 }
}

If the text is not valid and cannot be used، this section will be used:

private void error(int line, String msg) {
 System.err.println("Error, line " + line + ", " + msg);
 System.exit(1);
}

The codes for diagnosis are now implemented in this section

private static void formatMainText() {
 String[] lines = main_text.split("\n");
 StringBuilder sb = new StringBuilder();
 for (String line : lines) {
 sb.append(" ").append(line).append("\n");
 }
 main_text = sb.toString();
}


This code snippet clears the extra spaces inside the lines.






static void repeat_end() {
 int b = br_stack.pop();
 buffer += "br label %cond" + b + "\n";
 buffer += "false" + b + ":\n";
}

This snippet recognizes the decimal number code.

private static boolean isInteger(String s) {
 try {
 Integer.parseInt(s);
 } catch (Exception e) {
 return false;
 }
 return true;
}

This piece of code recognizes integer code, mobile number and ... .




static void assign_string(String id, String text, boolean 
global, String function) {
 int len = text.length() + 1;
 String str_type = "[" + len + " x i8]";
 if (global) {
 header_text += "@" + id + " = constant" + str_type + " 
c\"" + text + "\\00\"\n";
 } else {
 header_text += "@" + function + "." + id + " = constant" 
+ str_type + " c\"" + text + "\\00\"\n";
 }
}


This code snippet can recognize addresses ,the words، e-mail، etc.