#!/usr/bin/env ground

@begin
stdout "Calculation: "
stdin &calc
getstrsize $calc &calcsize
set &counter 0
set &left ""
set &right ""
set &operator ' '
set &isRight false

## Preprocessing

# Loop to parse input
@loopstart
getstrcharat $calc $counter &char

# Remove any spaces (they're inconvenient)
equal $char ' ' &cond
if $cond %doneif

# Check for operators
# '+' operator
inequal '+' $char &cond
if $cond %minusOpCheck
set &operator $char
set &isRight true
jump %doneif

@minusOpCheck
# '-' operator
inequal '-' $char &cond
if $cond %multiplyOpCheck
set &operator $char
set &isRight true
jump %doneif

@multiplyOpCheck
# '*' operator
inequal '*' $char &cond
if $cond %divideOpCheck
set &operator $char
set &isRight true
jump %doneif

@divideOpCheck
# '/' operator
inequal '/' $char &cond
if $cond %endOpChecks
set &operator $char
set &isRight true
jump %doneif

@endOpChecks
if $isRight %isRight
add $left $char &left
jump %doneif
@isRight
add $right $char &right
@doneif
add 1 $counter &counter
inequal $counter $calcsize &cond
if $cond %loopstart
# End loop

## Computing

# Convert types
stod $left &left
stod $right &right

# Calculations
# Adding
inequal $operator '+' &cond
if $cond %subtract
add $left $right &result
stdlnout $result
jump %begin

# Subtracting
@subtract
inequal $operator '-' &cond
if $cond %multiply
subtract $left $right &result
stdlnout $result
jump %begin

# Multiplying
@multiply
inequal $operator '*' &cond
if $cond %divide
multiply $left $right &result
stdlnout $result
jump %begin

# Dividing
@divide
inequal $operator '/' &cond
if $cond %error
divide $left $right &result
stdlnout $result
jump %begin

@error
stdlnout "Uh oh something terribly terrible happened lmao"
jump %begin