refactor how repl works

internal/testdata/arrays.monkey

@@ -0,0 +1,2 @@
+xs := [1, 2, 3]
+xs[0] + xs[1] + xs[2]

internal/testdata/assign.monkey

@@ -0,0 +1,3 @@
+x := 1
+x = 2
+x = x + 1

internal/testdata/binding.monkey

@@ -0,0 +1,3 @@
+x := 1
+y := 2
+z := x

internal/testdata/builtins.monkey

@@ -0,0 +1,13 @@
+xs := [1, 2, 3]
+len(xs)
+
+first(xs)
+rest(xs)
+last(xs)
+push(xs, 5)
+pop(xs)
+
+len("foo")
+
+x := input()
+print(x)

internal/testdata/closures.monkey

@@ -0,0 +1,2 @@
+f := fn(x) { fn() { x + 1 } }
+f(2)

internal/testdata/expressions.monkey

@@ -0,0 +1,2 @@
+1 + 2;
+(1 + 2) * 3;

internal/testdata/functions.monkey

@@ -0,0 +1,2 @@
+f := fn(x, y) { x * y };
+f(2, 4)

internal/testdata/hashes.monkey

@@ -0,0 +1,2 @@
+d := {"a": 1, "b": 2}
+d["a"] + d["b"]

internal/testdata/if.monkey

@@ -0,0 +1,5 @@
+x := 1
+if (x == 1) {
+  x = 2
+  x
+}

internal/testdata/mod.monkey

@@ -0,0 +1,3 @@
+a := 1
+A := 5
+Sum := fn(a, b) { return a + b }

internal/testdata/selectors.monkey

@@ -0,0 +1,5 @@
+d := {"foo": 1, "bar": 2}
+
+assert(d.foo == 1, "d.foo != 1")
+assert(d.bar == 2, "d.bar != 2")
+assert(d.bogus == null, "d.bogus != null")

internal/testdata/strings.monkey

@@ -0,0 +1,2 @@
+s := "hello"
+s + " " + "world"