[feat] The interpreter works and all the tests run without crashing.

chapter3g/interpreter.coffee

@@ -32,9 +32,11 @@ class Continuation
     else
       throw new LispInterpreterError "Continuations expect one argument"
   unwind: (value, ktarget) ->
-    if (@kont == ktarget) then (@kont.resume value) else (@kont.unwind value, ktarget)
+    if (@ == ktarget) then (@kont.resume value) else (@kont.unwind value, ktarget)
   catchLookup: (tag, kk) ->
     @kont.catchLookup tag, kk
+  resume: (value) ->
+    throw new LispInterpreterError "Wrong continuation for #{@_type}"
 
 # Abstract class representing the environment
 
@@ -258,6 +260,7 @@ evaluateReturnFrom = (label, form, env, kont) ->
 
 class ReturnFromCont extends Continuation
   constructor: (@kont, @env, @label) ->
+    @_type = "ReturnFromCont"
   resume: (v) ->
     @env.blockLookup @label, @kont, v
 
@@ -266,11 +269,13 @@ evaluateCatch = (tag, body, env, kont) ->
 
 class CatchCont extends Continuation
   constructor: (@kont, @body, @env) ->
+    @_type = "CatchFromCont"
   resume: (value) ->
     evaluateBegin @body, @env, (new LabeledCont @kont, value)
 
 class LabeledCont extends Continuation
   constructor: (@kont, @tag) ->
+    @_type = "LabeledFromCont"
   resume: (value) ->
     @kont.resume value
   catchLookup: (tag, kk) ->
@@ -281,6 +286,7 @@ class LabeledCont extends Continuation
 
 class ThrowCont extends Continuation
   constructor: (@kont, @form, @env) ->
+    @_type = "ThrowCont"
   resume: (value) ->
     @catchLookup value, @
   
@@ -289,17 +295,21 @@ evaluateThrow = (tag, form, env, kont) ->
 
 class UnwindCont extends Continuation
   constructor: (@kont, @value, @target) ->
+  resume: (value) ->
+    @kont.unwind @value, @target
 
 class ThrowingCont extends Continuation
   constructor: (@kont, @tag, @resumecont) ->
+    @_type = "ThrowingCont"
   resume: (value) ->
-    @kont.unwind @resumecont.resume value
+    @kont.unwind value, @resumecont
 
 evaluateUnwindProtect = (form, cleanup, env, kont) ->
   evaluate form, env, (new UnwindProtectCont kont, cleanup, env)
 
 class UnwindProtectCont extends Continuation
   constructor: (@kont, @cleanup, @env) ->
+    @_type = "UnwindProtectCont"
   resume: (value) ->
     evaluateBegin @cleanup, @env, (new ProtectReturnCont @kont, value)
   unwind: (value, target) ->
@@ -307,6 +317,7 @@ class UnwindProtectCont extends Continuation
 
 class ProtectReturnCont extends Continuation
   constructor: (@kont, @value) ->
+    @_type = "ProtectReturnCont"
   resume: (value) ->
     @kont.resume @value
 

chapter3g/test.coffee

@@ -1,4 +1,4 @@
-olisp = require '../chapter3/interpreter'
+olisp = require '../chapter3g/interpreter'
 {read, readForms} = require '../chapter1/reader'
 {inspect} = require 'util'
 
@@ -9,6 +9,4 @@ lisp = (ast) ->
 
 # console.log lisp read "(catch 2 (* 7 (catch 1 (* 3 (catch 2 (throw 1 (throw 2 5)) )) )))"
 
-console.log lisp read "(catch foo (throw foo 33))"
-console.log lisp read "(catch 'bar (throw 'bar 3))"
-console.log lisp read "(catch 1 (throw 1 7))"
+console.log lisp read "((lambda (c) (catch 111 (* 2 (unwind-protect (* 3 (throw 111 5)) (set! c 1) ))) ) 0)"

docs/new.md

@@ -0,0 +1,12 @@
+This doesn't really look like the read/analyze/compile passes that one
+expects of a modern Lisp.
+
+Reading converts the source code into a list of immutable values in the
+low-level AST of the system.  Reading and analysis must be combined if
+there are to be reader macros (which I want to support).
+
+... and then a miracle occurs ...
+
+Compilation is the process of turning the AST into javascript.
+
+

pending/test_chapter3g.coffee

@@ -1,53 +0,0 @@
-chai = require 'chai'
-chai.should()
-expect = chai.expect
-
-{cons} = require "cons-lists/lists"
-olisp = require '../chapter3g/interpreter'
-{read, readForms} = require '../chapter1/reader'
-
-the_false_value = (cons "false", "boolean")
-
-lisp = (ast) ->
-  ret = undefined
-  olisp ast, (i) -> ret = i
-  return ret
-  
-describe "Core interpreter #3: Unwind-Protect", ->
-  it "protects the value correctly", ->
-    expect(lisp read "(unwind-protect 1 2").to.equal(1)
-   it "", ->
-     expect(lisp read "((lambda (c) (unwind-protect 1 (set! c 2)) c ) 0 ").to.equal(2)
-   it "", ->
-     expect(lisp read "((lambda (c) (catch 111 (* 2 (unwind-protect (* 3 (throw 111 5)) (set! c 1) ))) ) 0 ").to.equal(5)
-   it "", ->
-     expect(lisp read "((lambda (c) (catch 111 (* 2 (unwind-protect (* 3 (throw 111 5)) (set! c 1) ))) c ) 0 ").to.equal(1)
-   it "", ->
-     expect(lisp read "((lambda (c) (block A (* 2 (unwind-protect (* 3 (return-from A 5)) (set! c 1) ))) ) 0 ").to.equal(5)
-   it "", ->
-     expect(lisp read "((lambda (c) (block A (* 2 (unwind-protect (* 3 (return-from A 5)) (set! c 1) ))) c ) 0 ").to.equal(1)
- 
- 
-describe "Core interpreter #3: Try/Catch with Throw as a function", ->
-  contain = (fcall) ->
-    return "(begin ((lambda () (begin (set! funcall (lambda (g . args) (apply g args))) #{fcall}))))"
-
-  it "", ->
-    expect(-> lisp read "(funcall throw 'bar 33").to.throw("bar")
-  it "", ->
-    expect(lisp read "(catch 'bar (funcall throw 'bar 11))").to.equal(11)
-  it "", ->
-    expect(lisp read "(catch 'bar (* 2 (funcall throw 'bar 5)))").to.equal(5)
-  it "", ->
-    expect(lisp read "((lambda (f) (catch 'bar (* 2 (f 5))) ) (lambda (x) (funcall throw 'bar x))) ").to.equal(5)
-  it "", ->
-    expect(lisp read "((lambda (f) (catch 'bar (* 2 (catch 'bar (* 3 (f 5))))) ) (lambda (x) (funcall throw 'bar x)))) ").to.equal(10)
-  it "", ->
-    expect(lisp read "(catch 2 (* 7 (catch 1 (* 3 (catch 2 (funcall throw 1 (funcall throw 2 5)) )) ))) ").to.equal(105)
-  it "", ->
-    expect(lisp read "(catch 2 (* 7 (funcall throw 1 (funcall throw 2 3))))").to.equal(3)
- 
- 
-  
- 
-

test/test_chapter3g.coffee

@@ -0,0 +1,50 @@
+chai = require 'chai'
+chai.should()
+expect = chai.expect
+
+{cons} = require "cons-lists/lists"
+olisp = require '../chapter3g/interpreter'
+{read, readForms} = require '../chapter1/reader'
+
+the_false_value = (cons "false", "boolean")
+
+lisp = (ast) ->
+  ret = undefined
+  olisp ast, (i) -> ret = i
+  return ret
+  
+describe "Core interpreter #3: Unwind-Protect", ->
+  it "unwinds but returns the value of the form", ->
+    expect(lisp read "(unwind-protect 1 2").to.equal(1)
+   it "unwinds within an iffe to correctly evaluate the side-effect", ->
+     expect(lisp read "((lambda (c) (unwind-protect 1 (set! c 2)) c ) 0 ").to.equal(2)
+   it "Unwinds inside an unevaluated definition", ->
+     expect(lisp read "((lambda (c) (catch 111 (* 2 (unwind-protect (* 3 (throw 111 5)) (set! c 1) ))) ) 0)").to.equal(5)
+   it "Unwinds inside the evaluated definition, triggering the side effect", ->
+     expect(lisp read "((lambda (c) (catch 111 (* 2 (unwind-protect (* 3 (throw 111 5)) (set! c 1) ))) c ) 0)").to.equal(1)
+   it "Same story, using block/return", ->
+     expect(lisp read "((lambda (c) (block A (* 2 (unwind-protect (* 3 (return-from A 5)) (set! c 1) ))) ) 0)").to.equal(5)
+   it "Same story, using block/return with a triggered side-effect", ->
+     expect(lisp read "((lambda (c) (block A (* 2 (unwind-protect (* 3 (return-from A 5)) (set! c 1) ))) c ) 0)").to.equal(1)
+ 
+ 
+#describe "Core interpreter #3: Try/Catch with Throw as a function", ->
+#  contain = (fcall) ->
+#    return "(begin ((lambda () (begin (set! funcall (lambda (g . args) (apply g args))) #{fcall}))))"
+#
+#  it "", ->
+#    expect(-> lisp read "(funcall throw 'bar 33").to.throw("bar")
+#  it "", ->
+#    expect(lisp read "(catch 'bar (funcall throw 'bar 11))").to.equal(11)
+#  it "", ->
+#    expect(lisp read "(catch 'bar (* 2 (funcall throw 'bar 5)))").to.equal(5)
+#  it "", ->
+#    expect(lisp read "((lambda (f) (catch 'bar (* 2 (f 5))) ) (lambda (x) (funcall throw 'bar x))) ").to.equal(5)
+#  it "", ->
+#    expect(lisp read "((lambda (f) (catch 'bar (* 2 (catch 'bar (* 3 (f 5))))) ) (lambda (x) (funcall throw 'bar x)))) ").to.equal(10)
+#  it "", ->
+#    expect(lisp read "(catch 2 (* 7 (catch 1 (* 3 (catch 2 (funcall throw 1 (funcall throw 2 5)) )) ))) ").to.equal(105)
+#  it "", ->
+#    expect(lisp read "(catch 2 (* 7 (funcall throw 1 (funcall throw 2 3))))").to.equal(3)
+ 
+