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module lang::rascal::tutor::repl::TutorCommandExecutor

rascal-0.40.13-BOOT2
rascal-tutor-0.19.9

Usage​

import lang::rascal::tutor::repl::TutorCommandExecutor;

Dependencies​

import util::Reflective;

data CommandExecutor​

A closure-based object wrapper for Rascal REPL

data CommandExecutor  
     = executor(
        PathConfig pcfg,
        str () prompt,
        void () reset,
        map[str mimeType, str content] (str command) eval
  )
     ;

Using an instance of CommandExecutor you can simulate the exact interactions between a Rascal REPL user and the REPL.

This was created to implement documentation pages with example REPL runs.

function createExecutor​

Instantiates a ((CommandExecutor)) to simulate a REPL

CommandExecutor createExecutor(PathConfig pcfg)

Examples​

It's funny that the current example is also executed by a CommandExecutor of the tutor compiler. Here we use to show how it works:

import lang::rascal::tutor::repl::TutorCommandExecutor;
import util::Reflective;
e = createExecutor(pathConfig());
// now we can find the current prompt:
e.prompt();
// and evaluate an assignment
e.eval("x = 1;");
// look what a continuation prompt looks like:
e.eval("println(\"abc\"")
e.prompt()
// finish the command we started
e.eval(")")

# Tests
## test executorSmokeTest {#lang-rascal-tutor-repl-TutorCommandExecutor-executorSmokeTest}

```rascal
test bool executorSmokeTest() {
  exec = createExecutor(pathConfig());

  if (exec.prompt() != "rascal\>") {
    return false;
  }

  output = exec.eval("import IO;");
  
  if (output["text/plain"] != "ok\n") {
    return false;
  }

  exec.eval("println(\"haai\"");

  if (exec.prompt() != "\>\>\>\>\>\>\>") {
    return false;
  }

  output = exec.eval(")");

  if (output["application/rascal+stdout"] != "haai\n") {
    return false;
  }

  return true;
}