Small brainfuck interpreter written in C++
Only requirements to compile the program are a C++11 compiler and Linux system.
g++ std=c++11 main.cpp parser.cpp interpreter.cpp functions.cpp
binary [OPTIONS -pn] [FILE]
Options: -p : Plain text output. The interpreter output won't contain bold characters -n : No output. The interpreter will not output the content of the used cells at each instruction run.
Both options and file can be omitted.
If options are omitted the interpreter will run outputting the content of the used cells for each instruction run. The current evaluated cell will be written in bold. If the current instruction is a print . then the output will be showed beside the cells. Only ASCII values from 33 to 255 (127 DEL excluded) will be shown as characters, the others will be shown with their integer value.
If the file is omitted the interpreter will ask the user to input the code directly. In this mode the only recognized instructions are brainfuck standards and @
To stop the program at input (for example in cat programs ,[.,]) the user can type !@. If need to input !@ the user can type \!@ and keep adding \ to consider them as input (e.g. \\\\!@ will output \\\!@)
The interpreter follows brainfuck original standard.
| Symbol | Instruction |
|---|---|
| > | Move to cell on the right (pointer ++) |
| < | Move to cell on the left (pointer --) |
| + | Increment the value of the current cell |
| - | Decrement the value of the current cell |
| . | Output the character signified by the current cell |
| , | Input a character and store it in the current cell |
| [ | Jump past the matching ] if the current cell is 0 |
| ] | Jump back to the matching [ if the current cell is not zero |
It uses 8bit cells in an array of 30000 cells. Wrapping of the array and cells is implemented.
The following extra symbols are also recognized:
| Symbol | Instruction |
|---|---|
| ! or # | Consider the line as comment |
| @ | Terminate execution here |