HP12C Parser

It's a simple parser that works like HP12C Financial Calculator.

Current implementation covers basically x,y,z registers and storage:

Basic operations like:

1
2
+ # => 3

See the code and examples.

1
2
+ # 3
+ # 5

1
2
+ # 3
5
+ # 8

sto for storage

Use sto <num> to storage the x register on a memory with the index specified on num.

1234
sto 1
rcl 1 # 1234

10
sto 1
20
sto 2
30
sto 3
rcl 1 # 10
rcl 2 # 20
rcl 3 # 30

rcl for recover from memory storage

As the example below, sto command stores the X and rcl recovers from that.

You can make operations bringing storage through rcl <num> command.

Where <num> is the same memory index used with sto <num> to get the value back.

123
sto 1
456
sto 2
rcl 2
rcl 1
- # 333

Try ruby hp12c.rb --repl to play with it.