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fix(dsl): improve error message when a rule function returns undefined

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This commit is contained in:
Amaan Qureshi 2024-07-05 03:24:01 -04:00
parent 12bd194937
commit a59a530049
1 changed files with 5 additions and 1 deletions
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6
cli/src/generate/dsl.js
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@ -301,7 +301,11 @@ function grammar(baseGrammar, options) {
if (typeof ruleFn !== "function") {
throw new Error(`Grammar rules must all be functions. '${ruleName}' rule is not.`);
}
rules[ruleName] = normalize(ruleFn.call(ruleBuilder, ruleBuilder, baseGrammar.rules[ruleName]));
const rule = ruleFn.call(ruleBuilder, ruleBuilder, baseGrammar.rules[ruleName]);
if (rule === undefined) {
throw new Error(`Rule '${ruleName}' returned undefined.`);
}
rules[ruleName] = normalize(rule);
}
}