Merge pull request #22 from hildjj/multiple-starts

Allow for multiple start rules

bin/abnf_gen.js

@@ -20,6 +20,11 @@ function genFormat(rules, opts) {
   }
 }
 
+function append(v, p = []) {
+  p.push(v);
+  return p;
+}
+
 const program = new Command();
 program
   .argument("[abnfFile...]", "ABNF files to turn into grammars.")
@@ -31,7 +36,8 @@ program
   )
   .option(
     "-s, --startRule <ruleName>",
-    "Start rule for generated grammar.  Defaults to first rule in ABNF grammar."
+    "Start rule for generated grammar.  Defaults to first rule in ABNF grammar.  Can be specified multiple times.",
+    append
   )
   .option("--stubs", "Generate stubs for rules that do not exist, rather than failing.")
   .option(

lib/ast.js

@@ -5,7 +5,7 @@
 /**
  * @typedef {object} FormatOptions
  * @prop {string} [format='peggy']
- * @prop {string} [startRule] Defaults to first
+ * @prop {string|string[]} [startRule] Defaults to first
  * @prop {boolean} [stubs=false]
  * @prop {boolean} [unused=false]
  */
@@ -369,10 +369,13 @@ export class Rules extends Base {
     if (!["peggy", "pest"].includes(opts.format)) {
       badFormat(opts);
     }
-    if (!opts.startRule) {
+    if (opts.startRule === null) {
       return "";
     }
-    const needed = [opts.startRule];
+    if (typeof opts.startRule === "string") {
+      opts.startRule = [opts.startRule];
+    }
+    const needed = [...opts.startRule];
     const done = new Set();
     let res = "";
     while (needed.length > 0) {

package.json

@@ -64,6 +64,12 @@
     "typescript": "^5.6.3"
   },
   "packageManager": "[email protected]",
+  "pnpm": {
+    "overrides": {
+      "braces": "^3.0.3",
+      "micromatch": "^4.0.8"
+    }
+  },
   "engines": {
     "node": ">=18"
   }

test/parse.ava.js

@@ -130,7 +130,7 @@ binarySep = %b1100001 %b1100010 %b1100011
 
 test("parser edges", t => {
   t.throws(() => parse("", {
-    startRule: "___INVALID____",
+    startRule: ["___INVALID____"],
   }));
 
   parse("foo = %x20\n", {