[refactor] Struggling to get self-evaluating components working.
This commit is contained in:
parent
5bba101ee2
commit
02f79c4255
2
Makefile
2
Makefile
|
@ -24,7 +24,7 @@ test: clean node_modules
|
|||
--reporter mocha-jenkins-reporter --compilers coffee:coffee-script/register || true
|
||||
|
||||
ltest: node_modules
|
||||
@node_modules/.bin/mocha --compilers coffee:coffee-script/register
|
||||
node_modules/.bin/mocha --compilers coffee:coffee-script/register
|
||||
|
||||
watch:
|
||||
while inotifywait $(SOURCES) ; do make test; done
|
||||
|
|
|
@ -2,19 +2,15 @@
|
|||
cdar, cadr, caadr, cadar, caddr, nilp, nil, setcdr, metacadr} = require "cons-lists/lists"
|
||||
readline = require "readline"
|
||||
{inspect} = require "util"
|
||||
{Symbol} = require "./reader_types"
|
||||
|
||||
class LispInterpreterError extends Error
|
||||
name: 'LispInterpreterError'
|
||||
constructor: (@message) ->
|
||||
|
||||
constructor: (@message, position = null) ->
|
||||
|
||||
env_init = nil
|
||||
env_global = env_init
|
||||
|
||||
defpredicate = (name, nativ, arity) ->
|
||||
defprimitive name, ((a, b) -> if nativ.call(null, a, b) then true else the_false_value), arity
|
||||
|
||||
|
||||
definitial = (name, value = nil) ->
|
||||
env_global = (cons (cons name, value), env_global)
|
||||
name
|
||||
|
@ -27,6 +23,9 @@ defprimitive = (name, nativ, arity) ->
|
|||
else
|
||||
throw (new LispInterpreterError "Incorrect arity"))
|
||||
|
||||
defpredicate = (name, nativ, arity) ->
|
||||
defprimitive name, ((a, b) -> if nativ.call(null, a, b) then true else the_false_value), arity
|
||||
|
||||
definitial "#t", true
|
||||
definitial "#f", the_false_value
|
||||
definitial "nil", nil
|
||||
|
@ -47,8 +46,84 @@ defpredicate "eq?", ((a, b) -> a == b), 2
|
|||
|
||||
the_false_value = (cons "false", "boolean")
|
||||
|
||||
extend = (env, variables, values) ->
|
||||
if (pairp variables)
|
||||
if (pairp values)
|
||||
(cons (cons (car variables), (car values)),
|
||||
(extend env, (cdr variables), (cdr values)))
|
||||
else
|
||||
throw new LispInterpreterError "Too few values"
|
||||
else if (nilp variables)
|
||||
if (nilp values) then env else throw new LispInterpreterError "Too many values"
|
||||
else
|
||||
if (symbolp variables)
|
||||
(cons (cons variables, values), env)
|
||||
else
|
||||
nil
|
||||
|
||||
make_function = (variables, body, env) ->
|
||||
(values) -> eprogn body, (extend env, variables, values)
|
||||
|
||||
invoke = (fn, args) ->
|
||||
(fn args)
|
||||
|
||||
# Takes a list of nodes and calls evaluate on each one, returning the
|
||||
# last one as the value of the total expression. In this example, we
|
||||
# are hard-coding what ought to be a macro, namely the threading
|
||||
# macros, "->"
|
||||
|
||||
eprogn = (exps, env) ->
|
||||
if (pairp exps)
|
||||
if pairp (cdr exps)
|
||||
evaluate (car exps), env
|
||||
eprogn (cdr exps), env
|
||||
else
|
||||
evaluate (car exps), env
|
||||
else
|
||||
nil
|
||||
|
||||
evlis = (exps, env) ->
|
||||
if (pairp exps)
|
||||
(cons (evaluate (car exps), env), (evlis (cdr exps), env))
|
||||
else
|
||||
nil
|
||||
|
||||
lookup = (id, env) ->
|
||||
if (pairp env)
|
||||
if (caar env) == id
|
||||
cdar env
|
||||
else
|
||||
lookup id, (cdr env)
|
||||
else
|
||||
nil
|
||||
|
||||
update = (id, env, value) ->
|
||||
if (pairp env)
|
||||
if (caar env) == id
|
||||
setcdr value, (car env)
|
||||
value
|
||||
else
|
||||
update id, (cdr env), value
|
||||
else
|
||||
nil
|
||||
|
||||
astSymbolsToLispSymbols = (node) ->
|
||||
nvalu = (node) -> cadr node
|
||||
return nil if nilp node
|
||||
throw (new LispInterpreterError "Not a list of variable names") if not (ntype(node) is 'list')
|
||||
handler = (node) ->
|
||||
return nil if nilp node
|
||||
cons (nvalu car node), (handler cdr node)
|
||||
handler(nvalu node)
|
||||
|
||||
|
||||
cadddr = metacadr('cadddr')
|
||||
|
||||
# This is really the only thing that changes behavior between "reader
|
||||
# nodes" (nodes loaded with debugging metadata) and a standard cons
|
||||
# object. TODO: astSymbolsToLispSymbols should be deprecated in
|
||||
# favor of normalizeForm (s?) and Symbol extraction
|
||||
|
||||
metadata_evaluation =
|
||||
listp: (node) -> (car node) == 'list'
|
||||
symbolp: (node) -> (car node) == 'symbol'
|
||||
|
@ -58,105 +133,32 @@ metadata_evaluation =
|
|||
|
||||
straight_evaluation =
|
||||
listp: (node) -> node.__type == 'list'
|
||||
symbolp: (node) -> node instanceOf Symbol
|
||||
commentp: (node) -> node instanceOf Comment
|
||||
symbolp: (node) -> node instanceof Symbol
|
||||
commentp: (node) -> node instanceof Comment
|
||||
numberp: (node) -> typeof node == 'number'
|
||||
stringp: (node) -> typeof node == 'string'
|
||||
boolp: (node) -> typeof node == 'boolean'
|
||||
nullp: (node) -> node == null
|
||||
vectorp: (node) -> (not listp node) and toString.call(node) == '[object Array]'
|
||||
recordp: (node) -> (not x._prototype?) and toSTring.call(node) == '[object Object]')
|
||||
objectp: (node) -> (x._prototype?) and toString.call(node) == '[object Object]')
|
||||
nilp: (node) -> node == nilp
|
||||
vectorp: (node) -> (not straight_evaluation.listp node) and toString.call(node) == '[object Array]'
|
||||
recordp: (node) -> (not node._prototype?) and toSTring.call(node) == '[object Object]'
|
||||
objectp: (node) -> (node._prototype?) and toString.call(node) == '[object Object]'
|
||||
nilp: (node) -> nilp(node)
|
||||
nvalu: (node) -> node
|
||||
|
||||
makeEvaluator = (ix = straight_evaluation) ->
|
||||
makeEvaluator = (ix = straight_evaluation, ty="straight") ->
|
||||
(exp, env) ->
|
||||
extend = (env, variables, values) ->
|
||||
if (pairp variables)
|
||||
if (pairp values)
|
||||
(cons (cons (car variables), (car values)),
|
||||
(extend env, (cdr variables), (cdr values)))
|
||||
else
|
||||
throw new LispInterpreterError "Too few values"
|
||||
else if (nilp variables)
|
||||
if (nilp values) then env else throw new LispInterpreterError "Too many values"
|
||||
else
|
||||
if (symbolp variables)
|
||||
(cons (cons variables, values), env)
|
||||
else
|
||||
nil
|
||||
|
||||
make_function = (variables, body, env) ->
|
||||
(values) -> eprogn body, (extend env, variables, values)
|
||||
|
||||
invoke = (fn, args) ->
|
||||
(fn args)
|
||||
|
||||
# Takes a list of nodes and calls evaluate on each one, returning the
|
||||
# last one as the value of the total expression. In this example, we
|
||||
# are hard-coding what ought to be a macro, namely the threading
|
||||
# macros, "->"
|
||||
|
||||
eprogn = (exps, env) ->
|
||||
if (pairp exps)
|
||||
if pairp (cdr exps)
|
||||
evaluate (car exps), env
|
||||
eprogn (cdr exps), env
|
||||
else
|
||||
evaluate (car exps), env
|
||||
else
|
||||
nil
|
||||
|
||||
evlis = (exps, env) ->
|
||||
if (pairp exps)
|
||||
(cons (evaluate (car exps), env), (evlis (cdr exps), env))
|
||||
else
|
||||
nil
|
||||
|
||||
lookup = (id, env) ->
|
||||
if (pairp env)
|
||||
if (caar env) == id
|
||||
cdar env
|
||||
else
|
||||
lookup id, (cdr env)
|
||||
else
|
||||
nil
|
||||
|
||||
update = (id, env, value) ->
|
||||
if (pairp env)
|
||||
if (caar env) == id
|
||||
setcdr value, (car env)
|
||||
value
|
||||
else
|
||||
update id, (cdr env), value
|
||||
else
|
||||
nil
|
||||
|
||||
# This really ought to be the only place where the AST meets the
|
||||
# interpreter core. I can't help but think that this design precludes
|
||||
# pluggable interpreter core.
|
||||
|
||||
astSymbolsToLispSymbols = (node) ->
|
||||
return nil if nilp node
|
||||
throw (new LispInterpreterError "Not a list of variable names") if not (ntype(node) is 'list')
|
||||
handler = (node) ->
|
||||
return nil if nilp node
|
||||
cons (nvalu car node), (handler cdr node)
|
||||
handler(nvalu node)
|
||||
|
||||
console.log("Type:", ty)
|
||||
# Takes an AST node and evaluates it and its contents. A node may be
|
||||
# ("list" (... contents ...)) or ("number" 42) or ("symbol" x), etc.
|
||||
|
||||
[type, exp] = [(ntype e), (nvalu e)]
|
||||
if type == "symbol"
|
||||
return lookup exp, env
|
||||
else if type in ["number", "string", "boolean", "vector"]
|
||||
if ix.symbolp(exp)
|
||||
return lookup (ix.nvalu exp).v, env
|
||||
else if ([ix.numberp, ix.stringp].filter (i) -> i(exp)).length > 0
|
||||
return exp
|
||||
else if type == "list"
|
||||
head = car exp
|
||||
if (ntype head) == 'symbol'
|
||||
switch (nvalu head)
|
||||
else if ix.listp(exp)
|
||||
head = car ix.nvalu exp
|
||||
if ix.symbolp(head)
|
||||
switch (ix.nvalu head).v
|
||||
when "quote" then cdr exp
|
||||
when "if"
|
||||
unless (evaluate (cadr exp), env) == the_false_value
|
||||
|
@ -164,12 +166,18 @@ makeEvaluator = (ix = straight_evaluation) ->
|
|||
else
|
||||
evaluate (cadddr exp), env
|
||||
when "begin" then eprogn (cdr exp), env
|
||||
when "set!" then update (nvalu cadr exp), env, (evaluate (caddr exp), env)
|
||||
when "set!" then update (ix.nvalu cadr exp).v, env, (evaluate (caddr exp), env)
|
||||
when "lambda" then make_function (astSymbolsToLispSymbols cadr exp), (cddr exp), env
|
||||
else invoke (evaluate (car exp), env), (evlis (cdr exp), env)
|
||||
else
|
||||
invoke (evaluate (car exp), env), (evlis (cdr exp), env)
|
||||
else
|
||||
throw new LispInterpreterError "Can't handle a #{type}"
|
||||
|
||||
|
||||
nodeEval = makeEvaluator(metadata_evaluation, "node")
|
||||
lispEval = makeEvaluator(straight_evaluation, "lisp")
|
||||
|
||||
evaluate = (exp, env) ->
|
||||
(if exp? and exp.__node then nodeEval else lispEval)(exp, env)
|
||||
|
||||
module.exports = (c) -> evaluate c, env_global
|
||||
|
|
Loading…
Reference in New Issue