Running commands from string

Question 1

I have a string:

string s="digitalWrite(8,LOW);"

Is there any way to run it as a code?

Question 2

Not an easy way, since you basically would need to write a C/C++ interpreter library for this. I don't know of such a library. Why do you need to do this? What are you trying to achieve?

Question 3

To run commands that will be saved in external eeprom

Question 4

Do you really have such complex programs to save there, that you need C syntax text there? Instead you could build your own command structure, which can be way easier to interpret. What commands do you need to save in the EEPROM?

Question 5

@chrisl thank you, I forgot that I can do it like this

Question 6

This is actually pretty simple:

if (s == "digitalWrite(8,LOW);") {    digitalWrite(8,LOW);}

Obviously, it will not work iss contains any other string... If youwant something more general, that is able to interpret a wide range ofpossible commands, you will have to define a language, and write aninterpreter for that language. From the example you give, it seems youwould like your language to look like C++. This is most likely a baddesign choice. If you want an interpreter that understands the whole C++language: forget it. You will never fit something this big into anArduino Uno.

Here is, for inspiration,a very simple interpreter Iwrote that understand the following commands:

mode <pin> <mode>: pinMode()read <pin>: digitalRead()aread <pin>: analogRead()write <pin> <value>: digitalWrite()awrite <pin> <value>: analogWrite()echo <value>: set echo off (0) or on (1)

You can use it a basis for writing your custom interpreter. Otherwiseyou can do a Web search for “Arduino interpreter”: you should be able tofind interpreters implementing a wide variety of languages, includingcompact binary languages (Firmata),Forth (another one),Lisp,Basic, and evena C-like language.

Edgar Bonet 45.2k4 gold badges42 silver badges81 bronze badges · Accepted Answer · 2020-03-14 11:51:39Z

This is actually pretty simple:

if (s == "digitalWrite(8,LOW);") {    digitalWrite(8,LOW);}

Obviously, it will not work iss contains any other string... If youwant something more general, that is able to interpret a wide range ofpossible commands, you will have to define a language, and write aninterpreter for that language. From the example you give, it seems youwould like your language to look like C++. This is most likely a baddesign choice. If you want an interpreter that understands the whole C++language: forget it. You will never fit something this big into anArduino Uno.

Here is, for inspiration,a very simple interpreter Iwrote that understand the following commands:

mode <pin> <mode>: pinMode()read <pin>: digitalRead()aread <pin>: analogRead()write <pin> <value>: digitalWrite()awrite <pin> <value>: analogWrite()echo <value>: set echo off (0) or on (1)

You can use it a basis for writing your custom interpreter. Otherwiseyou can do a Web search for “Arduino interpreter”: you should be able tofind interpreters implementing a wide variety of languages, includingcompact binary languages (Firmata),Forth (another one),Lisp,Basic, and evena C-like language.

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Running commands from string

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