Mr. Drew's Assignment Creator — Docker share build

Self-contained Dockerized build for end users. Run via docker compose; see README.md for setup. Source-only, no sample data or build artifacts. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-21 19:58:36 -04:00
commit 5a51a0f112
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+// lib/json-utils.js — tolerant JSON extraction for LLM responses.
+// Local models often wrap JSON in prose or code fences, or leave trailing commas.
+
+export function extractJson(text) {
+  if (text == null) throw new Error("Model returned an empty response.");
+  let s = String(text).trim();
+
+  // Strip code fences anywhere
+  s = s.replace(/```(?:json|javascript|js)?/gi, "```");
+  const fenced = s.match(/```([\s\S]*?)```/);
+  if (fenced && fenced[1].trim().match(/^[\[{]/)) s = fenced[1].trim();
+
+  // Slice from first brace/bracket to its matching end; try whichever starts first, first.
+  const candidates = [];
+  const firstObj = s.indexOf("{");
+  const firstArr = s.indexOf("[");
+  const objSlice = firstObj !== -1 ? s.slice(firstObj, s.lastIndexOf("}") + 1) : null;
+  const arrSlice = firstArr !== -1 ? s.slice(firstArr, s.lastIndexOf("]") + 1) : null;
+  if (firstArr !== -1 && (firstObj === -1 || firstArr < firstObj)) {
+    if (arrSlice) candidates.push(arrSlice);
+    if (objSlice) candidates.push(objSlice);
+  } else {
+    if (objSlice) candidates.push(objSlice);
+    if (arrSlice) candidates.push(arrSlice);
+  }
+  candidates.unshift(s);
+
+  let lastErr = null;
+  for (const c of candidates) {
+    if (!c) continue;
+    for (const attempt of [c, repair(c)]) {
+      try {
+        return JSON.parse(attempt);
+      } catch (e) {
+        lastErr = e;
+      }
+    }
+  }
+  const preview = s.slice(0, 300).replace(/\s+/g, " ");
+  throw new Error(
+    "Could not read the model's response as JSON. Try again, lower the temperature, or use a stronger model. Response began: " + preview
+  );
+}
+
+function repair(s) {
+  let out = s;
+  // Smart quotes -> straight quotes
+  out = out.replace(/[\u201C\u201D]/g, '"').replace(/[\u2018\u2019]/g, "'");
+  // Remove trailing commas before } or ]
+  out = out.replace(/,\s*([}\]])/g, "$1");
+  // Remove JS-style comments
+  out = out.replace(/^\s*\/\/.*$/gm, "");
+  // Control characters inside strings break JSON.parse; replace bare newlines in strings
+  out = sanitizeNewlinesInStrings(out);
+  return out;
+}
+
+function sanitizeNewlinesInStrings(s) {
+  let result = "";
+  let inStr = false;
+  let escaped = false;
+  for (let i = 0; i < s.length; i++) {
+    const ch = s[i];
+    if (inStr) {
+      if (escaped) {
+        result += ch;
+        escaped = false;
+        continue;
+      }
+      if (ch === "\\") {
+        result += ch;
+        escaped = true;
+        continue;
+      }
+      if (ch === '"') {
+        inStr = false;
+        result += ch;
+        continue;
+      }
+      if (ch === "\n") { result += "\\n"; continue; }
+      if (ch === "\r") { continue; }
+      if (ch === "\t") { result += "\\t"; continue; }
+      result += ch;
+    } else {
+      if (ch === '"') inStr = true;
+      result += ch;
+    }
+  }
+  return result;
+}