working

example/index.js

@@ -0,0 +1,5 @@
+const fs = require('fs')
+const parser = require('.')
+const input = fs.readFileSync('./example.s', 'utf-8')
+const r = parser(input)
+console.log(r)

parsers/directive.js

@@ -22,9 +22,17 @@ function directiveName () {
 function directive () {
   return mona.sequence((s) => {
     const d = s(directiveName())
-    const space = s(mona.spaces())
-    const args = s(parameters())
-    const nl = s(mona.eol())
+    const args = s(
+      mona.maybe(
+        mona.and(
+          mona.spaces(),
+          mona.followedBy(
+            parameters(),
+            mona.eol()
+          )
+        )
+      )
+    )
 
     return mona.value({
       directive: d,

parsers/parameters.js

@@ -8,8 +8,8 @@ function quotedChar () {
       mona.value('"')))
 }
 
-function bit () {
-  return mona.digit(2)
+function digit () {
+  return mona.text(mona.digit(), {min: 1})
 }
 
 function string () {
@@ -45,7 +45,7 @@ function address () {
 // this is the fallthrough parser
 function alphanum () {
   return mona.and(
-    mona.not(bit()),
+    mona.not(digit()),
     mona.not(address()),
     mona.not(binary()),
     mona.not(hex()),
@@ -63,7 +63,7 @@ function parameter () {
     mona.tag(binary(), 'binary'),
     mona.tag(hex(), 'hex'),
     mona.tag(string(), 'string'),
-    mona.tag(bit(), 'bit'),
+    mona.tag(digit(), 'digit'),
     mona.tag(alphanum(), 'alphanum')
   )
 }
@@ -71,11 +71,7 @@ function parameter () {
 function parameters () {
   return mona.split(
     parameter(),
-    mona.or(
-      mona.and(mona.string(','), mona.spaces()),
-      mona.string(','),
-      mona.spaces()
-    )
+    mona.trim(mona.string(','))
   )
 }
 

test/directive.js

@@ -7,7 +7,7 @@ tap.test('will parse a directive', (t) => {
   t.deepEqual(mona.parse(directiveParser(), '.inesprg 1\n'), {
     args: [
       {
-        'bit': '1'
+        'digit': '1'
       }
     ],
     directive: '.inesprg'

test/parameters.js

@@ -10,6 +10,14 @@ tap.test('should parse direct memory address param', (t) => {
   })
 })
 
+tap.test('should parse decimal param', (t) => {
+  t.plan(1)
+  const input = '17'
+  t.deepEqual(mona.parse(parsers.parameter(), input), {
+    'digit': '17'
+  })
+})
+
 tap.test('should parse alphanum param', (t) => {
   t.plan(1)
   const input = 'background3'