SeuLex

A Lexical-Analyzer Generator written in Java. The target language is C++.

Its core tech is reverse polish notation.

Build

Use maven to package.

Usage

We need you to write a lex file. Here is an example lex file of ANSI C.

Running JAR need two arguments.

path/to/intputFile path/to/outputFile

The input file is your lex file. The output file is the C++ lexer code we generated. And you will get a head file yy.tab.h.

What functions we provide

void count();
int yywrap();
void comment();
int check_type();
int yylex();

Feel free to modify them.

Example

The example using the example lex file of ANSI C. Run JAR with it.

$ java -jar SeuLex-1.0.jar path/to/example2.lex path/to/lex.cpp

Then we will get 2 files like lex.cpp and yy.tab.h. Compile them in a c++ compiler. Assume the executable file we get is lex.exe, execute it with one argument which is the file you want to perform lexical analysis. In addition, you can take no arguments to execute lex.exe which allows you to type your code in the console directly.

Input code segment

int main() {return 0;}

Output in console

Match word: int ID: 142
Match word:     ID: 0
Match word: main        ID: 10000
Match word: (   ID: 40
Match word: )   ID: 41
Match word:     ID: 0
Match word: {   ID: 123
Match word: return      ID: 181
Match word:     ID: 0
Match word: 0   ID: 128
Match word: ;   ID: 59
Match word: }   ID: 125