refactor: use csv-parse for declare block parsing

Replace manual CSV splitting with `csv-parse` to allow for
order-agnostic columns and better handling of quoted values.
The `tag` column is now optional.

src/cli/completions/declare-parser.ts

@@ -3,7 +3,7 @@
  *
  * Shared between CLI completions scanner and browser-side completions.
  *
- * Format:
+ * Format (columns can be in any order; `tag` is optional):
  *   tag,key,expr
  *   ,$hp,$con*5+$mod_hp          ← variable declaration
  *   ,$ac,10+$dex                   ← variable declaration
@@ -14,6 +14,8 @@
  * When `tag` is present: when #tag is active, $key gets expr added to its base.
  */
 
+import { parse } from "csv-parse/browser/esm/sync";
+
 export interface VarDeclaration {
   key: string;        // "$hp" (always starts with $)
   expression: string; // "$con*5+$mod_hp"
@@ -34,33 +36,34 @@ export interface DeclareResult {
  * Parse a ```csv role=declare block.
  */
 export function parseDeclareCsv(csv: string, source: string): DeclareResult {
-  const lines = csv.trim().split(/\r?\n/);
-  if (lines.length === 0) return { variables: [], tagModifiers: [] };
+  const trimmed = csv.trim();
+  if (!trimmed) return { variables: [], tagModifiers: [] };
 
-  // First line is header; validate it
-  const headers = lines[0].split(",").map((h) => h.trim().toLowerCase());
-  if (headers[0] !== "tag" || headers[1] !== "key" || headers[2] !== "expr") {
+  // Validate that required columns exist (order-agnostic, tag is optional)
+  const firstLine = trimmed.split(/\r?\n/)[0];
+  const headers = firstLine.split(",").map((h) => h.trim().toLowerCase());
+  if (!headers.includes("key") || !headers.includes("expr")) {
     throw new Error(
-      `${source}: role=declare blocks must have headers "tag,key,expr". Got: ${headers.join(",")}`,
+      `${source}: role=declare blocks must have "key" and "expr" columns. Got: ${headers.join(",")}`,
     );
   }
 
+  const records = parse(trimmed, {
+    columns: true,
+    trim: true,
+    skipEmptyLines: true,
+  }) as Array<{ tag?: string; key: string; expr: string }>;
+
   const variables: VarDeclaration[] = [];
   const tagModifiers: TagModifier[] = [];
 
-  for (let i = 1; i < lines.length; i++) {
-    const row = lines[i].trim();
-    if (!row || row.startsWith("#")) continue;
-
-    const cols = splitCsvRow(row);
-    if (cols.length < 3) continue;
-
-    const tag = cols[0]?.trim() ?? "";
-    const key = cols[1]?.trim() ?? "";
-    const expr = cols[2]?.trim() ?? "";
+  for (const row of records) {
+    const tag = row.tag ?? "";
+    const key = row.key ?? "";
+    const expr = row.expr ?? "";
 
     if (!key || !expr) {
-      console.warn(`${source}:${i + 1}: skipping row with empty key or expr`);
+      console.warn(`${source}: skipping row with empty key or expr`);
       continue;
     }
 
@@ -68,12 +71,12 @@ export function parseDeclareCsv(csv: string, source: string): DeclareResult {
       // Tag modifier
       if (!tag.startsWith("#")) {
         throw new Error(
-          `${source}:${i + 1}: tag must start with #, got "${tag}"`,
+          `${source}: tag must start with #, got "${tag}"`,
         );
       }
       if (!key.startsWith("$")) {
         throw new Error(
-          `${source}:${i + 1}: key must start with $, got "${key}"`,
+          `${source}: key must start with $, got "${key}"`,
         );
       }
       tagModifiers.push({ tag, target: key, expression: expr });
@@ -81,7 +84,7 @@ export function parseDeclareCsv(csv: string, source: string): DeclareResult {
       // Variable declaration
       if (!key.startsWith("$")) {
         throw new Error(
-          `${source}:${i + 1}: key must start with $, got "${key}"`,
+          `${source}: key must start with $, got "${key}"`,
         );
       }
       variables.push({ key, expression: expr });
@@ -90,27 +93,3 @@ export function parseDeclareCsv(csv: string, source: string): DeclareResult {
 
   return { variables, tagModifiers };
 }
-
-// ---------------------------------------------------------------------------
-// CSV row splitter
-// ---------------------------------------------------------------------------
-
-function splitCsvRow(row: string): string[] {
-  const cols: string[] = [];
-  let current = "";
-  let inQuote = false;
-
-  for (let i = 0; i < row.length; i++) {
-    const ch = row[i];
-    if (ch === '"') {
-      inQuote = !inQuote;
-    } else if (ch === "," && !inQuote) {
-      cols.push(current);
-      current = "";
-    } else {
-      current += ch;
-    }
-  }
-  cols.push(current);
-  return cols;
-}