Callback math_eval

Usage notes:

• Certain formulation can cause unexpected behaviour. As examples: division by zero division by negative number, example: 48/-7 using text or char except for callback for operand using another operator (<, >, =,etc)

• Supported operators: +, -, *, /
• Arguments can't start and end with operator (+, -, *, / )
• Two operators one after the other will cause an error
• The priority for operator is still working, which mean that the multiplication and division will be executed first followed by addition and substraction
  • Parentheses ((, )) can't be used to change operator priority.
• Integer division method will be used for division.
• Callback don't work with float numbers

Here are some common operations:

Example code:

<SnomIPPhoneText>
    <Text>
	4=$(math_eval:4)<br />
	1+2=$(math_eval:1+2)<br />
	1-2=$(math_eval:1-2)<br />
	max_registrations-1=$(math_eval:$(max_registrations)-1)<br />
	2*3=$(math_eval:2*3)<br />
	0*4=$(math_eval:0*4)<br />
	4/2=$(math_eval:4/2)<br />
	10/3=$(math_eval:10/3)<br />
	47/7=$(math_eval:47/7)<br />
	0/4=$(math_eval:0/4)<br />
	1+3*4=$(math_eval:1+3*4)<br />
	1-10/5=$(math_eval:1-10/5)<br />
	109/10/4=$(math_eval:109/10/4)<br />
    </Text>
</SnomIPPhoneText>

Result:

• Page:
  Boolean Callbacks
• Page:
  Callback arch_series
• Page:
  Callback bool_eval
• Page:
  Callback checkbox_property
• Page:
  Callback condition
• Page:
  Callback create_url
• Page:
  Callback current_input
• Page:
  Callback current_line
• Page:
  Callback date
• Page:
  Callback display_type
• Page:
  Callback empty
• Page:
  Callback enum
• Page:
  Callback fragment
• Page:
  Callback get_cmd
• Page:
  Callback lang
• Page:
  Callback lines
• Page:
  Callback list_size
• Page:
  Callback math_eval
• Page:
  Callback max_registrations
• Page:
  Callback mod_ifc
• Page:
  Callback on_off
• Page:
  Callback phone_state
• Page:
  Callback remove_cmd
• Page:
  Callback set
• Page:
  Callback setcache
• Page:
  Callback show_feature
• Page:
  Callback status_message
• Page:
  Callback time
• Page:
  Callback urlencode
• Page:
  Callback user_displayname
• Page:
  Callback var
• Page:
  Callback var_ifc
• Page:
  Callback wifiscan
• Page:
  Callback wlang
• Page:
  Callbacks
• Page:
  Callbacks edit_mode and next_edit_mode
• Page:
  Callbacks for function keys
• Page:
  Callbacks sel and lastsel