add ludus-extraction function from svg

build/ludus.mjs

@@ -2,25 +2,29 @@ import init from "./out.mjs"
 
 const mod = await init()
 
-let result = null
+let res = null
 
 let code = null
 
 export function run (source) {
   code = source
   const output = mod.ludus(source).value
-  result = JSON.parse(output)
-  return result
+  res = JSON.parse(output)
+  return res
 }
 
 export function stdout () {
-  if (!result) return ""
-  return result.io.console.data
+  if (!res) return ""
+  return res.io.console.data
 }
 
 export function turtle_commands () {
-  if (!result) return []
-  return result.io.turtle.data
+  if (!res) return []
+  return res.io.turtle.data
+}
+
+export function result () {
+  return res
 }
 
 const turtle_init = {
@@ -55,6 +59,7 @@ function resolve_color (color) {
   if (typeof color === 'string') return colors[color]
   if (typeof color === 'number') return [color, color, color, 255]
   if (Array.isArray(color)) return color
+  return [0, 0, 0, 255] // default to black?
 }
 
 let background_color = "black"
@@ -204,7 +209,7 @@ function turn_to_rad (heading) {
 }
 
 function turn_to_deg (heading) {
-  return ((heading % 1) * 360)
+  return (heading % 1) * 360
 }
 
 function svg_render_line (prev, curr) {
@@ -227,6 +232,16 @@ function escape_svg (svg) {
     .replace(/'/g, "'")
 }
 
+export function extract_ludus (svg) {
+  const code = svg.split("<ludus>")[1]?.split("</ludus>")[0] ?? ""
+  return code 
+    .replace(/&amp;/g, "&")
+    .replace(/&lt;/g, "<")
+    .replace(/&gt;/g, ">")
+    .replace(/&quot;/g, `"`)
+    .replace(/&apos;/g, `'`)
+}
+
 function svg_render_path (states) {
   const path = []
   for (let i = 1; i < states.length; ++i) {
@@ -277,8 +292,9 @@ export function svg (commands) {
   const view_height = (maxY - minY) * 1.2
   const margin = Math.max(view_width, view_height) * 0.1
   const x1 = minX - margin
-  const y1 = minY - margin
-  const x2 = maxX + margin
+  // don't actually need these:
+  // const y1 = minY - margin
+  // const x2 = maxX + margin
   const y2 = maxY + margin
   const path = svg_render_path(states)
   const turtle = svg_render_turtle(states[states.length - 1])