Xlang-compiler

A compiler for a c-like language

Here is a compiler for Xlang language. It’s implemented in three phases: Lexical analyser, Syntax analyser and Semantic analyser. Compiler gets the code and prints its tokens in a tree structure. It also checks if there is any syntax or semantic error in code.

Xlang is a C-like language with these rules:

• All keywords must be written in lowercase (“if” is a keyword but “IF” is a variable)

• Keywords in Xlang: Boolean, break, callout, class, continue, else, for, if, false, return, true, void, int

• Variable names are made of characters, numbers and Underscore. Names can’t start with a number

• Use // to comment a line of code

• Strings should be in “ ” and chars should be in ‘ ‘

• Numbers should be 32-bit signed hexadecimal or decimal.

  Decimal: from -2147483648 to 2147483647

  Hexadecimal: 0x[a-f A-F 0-9]

• Operators in Xlang: + - * / % < > != <= >= == && || ! = -= +=

• Other tokens: ( ) { } [ ] ; ,

• All codes must be written in Program class that has three parts:

    Field declaration: Declaring global variables 

    Method declaration: Defining Functions 

    Main: void main(){} function as the entry point of program

• Conditional statement syntax:

if (expr) {
//if body
}

if (expr) {
 //if body 
} 
else 
{ 
//else body
 }

For loop syntax:

for x = expr , expr {
//for body
}

Requirements

Flex

Bison

Project team

@zamanighazaleh

@RezaBlaugrana