Inlining all method calls in an object

This pull request introduces a module Inliner with one function among other things:

def inlineAllCalls(prog: EOProg[EOExprOnly]): Either[NonEmptyList[String], EOProg[EOExprOnly]]

which takes a program AST as input, detects all objects, detects all methods inside objects, inside methods finds all the method calls and inlines those calls with their definitions. This method can also fail if some errors occur in the process. These errors include:

Insufficient number of arguments passed to a method
Too many arguments passed to a method
Calling a non-existent method

Directory test/scala/org/polystat/odin/analysis/inlining contains the test case definitions (XTestCases.scala) and the runner code for tests (InliningTests.scala). Link to test inlining test cases. Example test case:

val average3WithComponentsTest: InliningTestCase = InliningTestCase(
    label = "average3 that also returns the sum and count",
    codeBefore = // before inlining
      """[] > obj
        |  [self arg1 arg2 arg3] > average3
        |    arg1.add (arg2.add arg3) > sum
        |    3 > count
        |    sum.div count > average
        |    [] > @
        |      ^.sum > sum
        |      ^.count > count
        |      ^.average > average
        |  [self] > call-site
        |    self.average3 self 1 2 3 > @
        |""".stripMargin,
    codeAfter = // code after inlining
      """[] > obj
        |  [self arg1 arg2 arg3] > average3
        |    $.arg1.add > sum
        |      $.arg2.add
        |        $.arg3
        |    3 > count
        |    $.sum.div > average
        |      $.count
        |    [] > @
        |      ^.sum > sum
        |      ^.count > count
        |      ^.average > average
        |  [self] > call-site
        |    [] > local_average3
        |      1.add > sum
        |        2.add
        |          3
        |      3 > count
        |      $.sum.div > average
        |        $.count
        |    [] > @
        |      ^.local_average3.sum > sum
        |      ^.local_average3.count > count
        |      ^.local_average3.average > average
        |""".stripMargin.asRight
  )

polystat / odin

Inlining all method calls in an object #30