From 181f984defabaf09396e32ddaa2608a55887cee6 Mon Sep 17 00:00:00 2001
From: ochafik <ochafik@google.com>
Date: Mon, 8 Apr 2024 23:06:42 +0100
Subject: [PATCH] json: unify all repetition code (w/ or w/o sep)

---
 common/json-schema-to-grammar.cpp             |  137 +-
 examples/json_schema_to_grammar.py            |   95 +-
 .../server/json-schema-to-grammar.mjs.hpp     | 3388 +++++++++--------
 .../server/public/json-schema-to-grammar.mjs  |  113 +-
 tests/test-json-schema-to-grammar.cpp         |   14 +-
 5 files changed, 1885 insertions(+), 1862 deletions(-)

diff --git a/common/json-schema-to-grammar.cpp b/common/json-schema-to-grammar.cpp
index eb361bd81..d1ebb9a04 100644
--- a/common/json-schema-to-grammar.cpp
+++ b/common/json-schema-to-grammar.cpp
@@ -11,21 +11,63 @@
 
 using json = nlohmann::ordered_json;
 
-static std::string build_repetition(const std::string & content, int upToN) {
-    std::ostringstream out;
-    std::function<void(int)> aux = [&](int n) {
-        if (n == 0) {
-            return;
+template <typename Iterator>
+static std::string join(Iterator begin, Iterator end, const std::string & separator);
+
+static std::string repeat(const std::string & str, size_t n);
+
+static std::string build_repetition(const std::string & item_rule, int min_items, int max_items, const std::string & separator_rule = "", bool item_rule_is_literal = false) {
+    if (separator_rule.empty()) {
+        if (min_items == 0 && max_items == 1) {
+            return item_rule + "?";
+        } else if (min_items == 1 && max_items == std::numeric_limits<int>::max()) {
+            return item_rule + "+";
         }
-        out << "(" << content;
-        if (n > 1) {
-            out << " ";
-            aux(n - 1);
+    }
+
+    std::string result;
+    if (min_items > 0) {
+        if (item_rule_is_literal && separator_rule.empty()) {
+            result = "\"" + repeat(std::string(item_rule.begin() + 1, item_rule.end() - 1), min_items) + "\"";
+        } else {
+            std::vector<std::string> items(min_items, item_rule);
+            result = join(items.begin(), items.end(), separator_rule.empty() ? " " : " " + separator_rule + " ");
         }
-        out << ")?";
+    }
+
+    std::function<std::string(int, bool)> opt_repetitions = [&](int up_to_n, bool prefix_with_sep) -> std::string {
+        if (up_to_n == 0) {
+            return "";
+        }
+
+        std::string res;
+        if (!separator_rule.empty() && prefix_with_sep) {
+            res = separator_rule + " " + item_rule;
+        } else {
+            res = item_rule;
+        }
+        if (up_to_n > 1) {
+            res += " " + opt_repetitions(up_to_n - 1, true);
+        }
+        return "(" + res + ")?";
     };
-    aux(upToN);
-    return out.str();
+
+    if (min_items > 0 && max_items != min_items) {
+        result += " ";
+    }
+
+    if (max_items != std::numeric_limits<int>::max()) {
+        result += opt_repetitions(max_items - min_items, min_items > 0);
+    } else {
+        std::string item_operator = "(" + (separator_rule.empty() ? "" : separator_rule + " ") + item_rule + ")";
+        if (min_items == 0 && !separator_rule.empty()) {
+            result = "(" + item_rule + " " + item_operator + "*)?";
+        } else {
+            result += item_operator + "*";
+        }
+    }
+
+    return result;
 }
 
 const std::string SPACE_RULE = "\" \"?";
@@ -35,7 +77,7 @@ struct BuiltinRule {
     std::vector<std::string> deps;
 };
 
-const std::string _up_to_15_digits = build_repetition("[0-9]", 15);
+const std::string _up_to_15_digits = build_repetition("[0-9]", 0, 15);
 
 std::unordered_map<std::string, BuiltinRule> PRIMITIVE_RULES = {
     {"boolean", {"(\"true\" | \"false\") space", {}}},
@@ -333,42 +375,21 @@ private:
                     auto &sub = last.first;
                     auto sub_is_literal = last.second;
 
-                    if (min_times == 0 && max_times == std::numeric_limits<int>::max()) {
-                        sub += "*";
-                    } else if (min_times == 0 && max_times == 1) {
-                        sub += "?";
-                    } else if (min_times == 1 && max_times == std::numeric_limits<int>::max()) {
-                        sub += "+";
-                    } else {
-                        if (!sub_is_literal) {
-                            std::string & sub_id = sub_rule_ids[sub];
-                            if (sub_id.empty()) {
-                                sub_id = _add_rule(name + "-" + std::to_string(sub_rule_ids.size()), sub);
-                            }
-                            sub = sub_id;
+                    if (!sub_is_literal) {
+                        std::string & sub_id = sub_rule_ids[sub];
+                        if (sub_id.empty()) {
+                            sub_id = _add_rule(name + "-" + std::to_string(sub_rule_ids.size()), sub);
                         }
-                        std::string result;
-                        if (sub_is_literal && min_times > 0) {
-                            result = "\"" + repeat(sub.substr(1, sub.length() - 2), min_times) + "\"";
-                        } else {
-                            for (int j = 0; j < min_times; j++) {
-                                if (j > 0) {
-                                    result += " ";
-                                }
-                                result += sub;
-                            }
-                        }
-                        if (min_times > 0 && min_times < max_times) {
-                            result += " ";
-                        }
-                        if (max_times == std::numeric_limits<int>::max()) {
-                            result += sub + "*";
-                        } else {
-                            result += build_repetition(sub, max_times - min_times);
-                        }
-                        seq.back().first = result;
-                        seq.back().second = false;
+                        sub = sub_id;
                     }
+                    seq.back().first = build_repetition(
+                        sub_is_literal ? "\"" + sub + "\"" : sub,
+                        min_times,
+                        max_times,
+                        "",
+                        sub_is_literal
+                    );
+                    seq.back().second = false;
                 } else {
                     std::string literal;
                     auto is_non_literal = [&](char c) {
@@ -686,27 +707,11 @@ public:
                 return _add_rule(rule_name, rule);
             } else {
                 std::string item_rule_name = visit(items, name + (name.empty() ? "" : "-") + "item");
-                std::string list_item_operator = "( \",\" space " + item_rule_name + " )";
-                std::string successive_items;
                 int min_items = schema.contains("minItems") ? schema["minItems"].get<int>() : 0;
                 json max_items_json = schema.contains("maxItems") ? schema["maxItems"] : json();
-                int max_items = max_items_json.is_number_integer() ? max_items_json.get<int>() : -1;
-                if (min_items > 0) {
-                    successive_items += repeat(list_item_operator, min_items - 1);
-                    min_items--;
-                }
-                if (max_items >= 0 && max_items > min_items) {
-                    successive_items += build_repetition(list_item_operator, max_items - min_items - 1);
-                } else {
-                    successive_items += list_item_operator + "*";
-                }
-                std::string rule;
-                if (min_items == 0) {
-                    rule =  "\"[\" space ( " + item_rule_name + " " + successive_items + " )? \"]\" space";
-                } else {
-                    rule =  "\"[\" space " + item_rule_name + " " + successive_items + " \"]\" space";
-                }
-                return _add_rule(rule_name, rule);
+                int max_items = max_items_json.is_number_integer() ? max_items_json.get<int>() : std::numeric_limits<int>::max();
+
+                return _add_rule(rule_name, "\"[\" space " + build_repetition(item_rule_name, min_items, max_items, "\",\" space") + " \"]\" space");
             }
         } else if ((schema_type.is_null() || schema_type == "string") && schema.contains("pattern")) {
             return _visit_pattern(schema["pattern"], rule_name);
diff --git a/examples/json_schema_to_grammar.py b/examples/json_schema_to_grammar.py
index 7e7564bb9..acd98b70c 100755
--- a/examples/json_schema_to_grammar.py
+++ b/examples/json_schema_to_grammar.py
@@ -6,18 +6,52 @@ import re
 import sys
 from typing import Any, Dict, List, Set, Tuple, Union
 
-def _build_repetition(content, up_to_n):
-    # return ' '.join([content] * n)
-    if up_to_n == 0:
-        return ''
-    return f'({content}{" " + _build_repetition(content, up_to_n-1) if up_to_n > 1 else ""})?'
+def _build_repetition(item_rule, min_items, max_items, separator_rule=None, item_rule_is_literal=False):
+    if not separator_rule:
+        if min_items == 0 and max_items == 1:
+            return f'{item_rule}?'
+        elif min_items == 1 and max_items is None:
+            return f'{item_rule}+'
+
+    result = ''
+
+    if min_items > 0:
+        if item_rule_is_literal and separator_rule is None:
+            result = '"' + (item_rule[1:-1] * min_items) + '"'
+        else:
+            result = (f' {separator_rule} ' if separator_rule else ' ').join([item_rule] * min_items)
+
+    def opt_repetitions(up_to_n, prefix_with_sep=False):
+        if up_to_n == 0:
+            return ''
+
+        res = separator_rule + ' ' + item_rule if separator_rule and prefix_with_sep else item_rule
+        if up_to_n > 1:
+            res += ' ' + opt_repetitions(up_to_n - 1, prefix_with_sep=True)
+        return f'({res})?'
+
+    if min_items > 0 and max_items != min_items:
+        result += ' '
+
+    if max_items is not None:
+        result += opt_repetitions(max_items - min_items, prefix_with_sep=min_items > 0)
+    else:
+        item_operator = f'({separator_rule + " " if separator_rule else ""}{item_rule})'
+
+        if min_items == 0 and separator_rule:
+            result = f'({item_rule} {item_operator}*)?'
+        else:
+            result += f'{item_operator}*'
+
+    return result
+
 
 class BuiltinRule:
     def __init__(self, content: str, deps: list[str] = None):
         self.content = content
         self.deps = deps or []
 
-_up_to_15_digits = _build_repetition('[0-9]', 15)
+_up_to_15_digits = _build_repetition('[0-9]', 0, 15)
 
 # whitespace is constrained to a single space char to prevent model "running away" in
 # whitespace. Also maybe improves generation quality?
@@ -286,34 +320,14 @@ class SchemaConverter:
 
                     (sub, sub_is_literal) = seq[-1]
 
-                    if min_times == 0 and max_times is None:
-                        sub = f'"{sub}"' if sub_is_literal else sub
-                        seq[-1] = (f'{sub}*', False)
-                    elif min_times == 0 and max_times == 1:
-                        sub = f'"{sub}"' if sub_is_literal else sub
-                        seq[-1] = (f'{sub}?', False)
-                    elif min_times == 1 and max_times is None:
-                        sub = f'"{sub}"' if sub_is_literal else sub
-                        seq[-1] = (f'{sub}+', False)
-                    else:
-                        if not sub_is_literal:
-                            id = sub_rule_ids.get(sub)
-                            if id is None:
-                                id = self._add_rule(f'{name}-{len(sub_rule_ids) + 1}', sub)
-                                sub_rule_ids[sub] = id
-                            sub = id
+                    if not sub_is_literal:
+                        id = sub_rule_ids.get(sub)
+                        if id is None:
+                            id = self._add_rule(f'{name}-{len(sub_rule_ids) + 1}', sub)
+                            sub_rule_ids[sub] = id
+                        sub = id
 
-                        if sub_is_literal and min_times > 0:
-                            result = '"' + (sub[1:-1] * min_times) + '"'
-                        else:
-                            result = ' '.join([sub] * min_times)
-
-                        if min_times < max_times:
-                            if min_times > 0:
-                                result += ' '
-                            result += _build_repetition(sub, max_times - min_times)
-
-                        seq[-1] = (result, False)
+                    seq[-1] = (_build_repetition(f'"{sub}"' if sub_is_literal else sub, min_times, max_times, item_rule_is_literal=sub_is_literal), False)
                 else:
                     literal = ''
                     while i < length:
@@ -421,22 +435,9 @@ class SchemaConverter:
                     ' "]" space')
             else:
                 item_rule_name = self.visit(items, f'{name}{"-" if name else ""}item')
-                list_item_operator = f'( "," space {item_rule_name} )'
-                successive_items = ""
                 min_items = schema.get("minItems", 0)
                 max_items = schema.get("maxItems")
-                if min_items > 0:
-                    successive_items = list_item_operator * (min_items - 1)
-                    min_items -= 1
-                if max_items is not None and max_items > min_items:
-                    successive_items += _build_repetition(list_item_operator, max_items - min_items - 1)
-                else:
-                    successive_items += list_item_operator + "*"
-                if min_items == 0:
-                    rule = f'"[" space ( {item_rule_name} {successive_items} )? "]" space'
-                else:
-                    rule = f'"[" space {item_rule_name} {successive_items} "]" space'
-                return self._add_rule(rule_name, rule)
+                return self._add_rule(rule_name, '"[" space ' + _build_repetition(item_rule_name, min_items, max_items, separator_rule='"," space') + ' "]" space')
 
         elif schema_type in (None, 'string') and 'pattern' in schema:
             return self._visit_pattern(schema['pattern'], rule_name)
diff --git a/examples/server/json-schema-to-grammar.mjs.hpp b/examples/server/json-schema-to-grammar.mjs.hpp
index 02b6aa474..265f3b56e 100644
--- a/examples/server/json-schema-to-grammar.mjs.hpp
+++ b/examples/server/json-schema-to-grammar.mjs.hpp
@@ -12,1760 +12,1764 @@ unsigned char json_schema_to_grammar_mjs[] = {
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+  0x6c, 0x65, 0x74, 0x20, 0x6c, 0x61, 0x73, 0x74, 0x4b, 0x65, 0x79, 0x20,
+  0x3d, 0x20, 0x6e, 0x75, 0x6c, 0x6c, 0x3b, 0x0a, 0x20, 0x20, 0x6c, 0x65,
+  0x74, 0x20, 0x67, 0x72, 0x6f, 0x75, 0x70, 0x20, 0x3d, 0x20, 0x5b, 0x5d,
+  0x3b, 0x0a, 0x20, 0x20, 0x66, 0x6f, 0x72, 0x20, 0x28, 0x63, 0x6f, 0x6e,
+  0x73, 0x74, 0x20, 0x65, 0x6c, 0x65, 0x6d, 0x65, 0x6e, 0x74, 0x20, 0x6f,
+  0x66, 0x20, 0x69, 0x74, 0x65, 0x72, 0x61, 0x62, 0x6c, 0x65, 0x29, 0x20,
+  0x7b, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x63, 0x6f, 0x6e, 0x73, 0x74, 0x20,
+  0x6b, 0x65, 0x79, 0x20, 0x3d, 0x20, 0x6b, 0x65, 0x79, 0x46, 0x6e, 0x28,
+  0x65, 0x6c, 0x65, 0x6d, 0x65, 0x6e, 0x74, 0x29, 0x3b, 0x0a, 0x20, 0x20,
+  0x20, 0x20, 0x69, 0x66, 0x20, 0x28, 0x6c, 0x61, 0x73, 0x74, 0x4b, 0x65,
+  0x79, 0x20, 0x21, 0x3d, 0x3d, 0x20, 0x6e, 0x75, 0x6c, 0x6c, 0x20, 0x26,
+  0x26, 0x20, 0x6b, 0x65, 0x79, 0x20, 0x21, 0x3d, 0x3d, 0x20, 0x6c, 0x61,
+  0x73, 0x74, 0x4b, 0x65, 0x79, 0x29, 0x20, 0x7b, 0x0a, 0x20, 0x20, 0x20,
+  0x20, 0x20, 0x20, 0x79, 0x69, 0x65, 0x6c, 0x64, 0x20, 0x5b, 0x6c, 0x61,
+  0x73, 0x74, 0x4b, 0x65, 0x79, 0x2c, 0x20, 0x67, 0x72, 0x6f, 0x75, 0x70,
+  0x5d, 0x3b, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x67, 0x72, 0x6f,
+  0x75, 0x70, 0x20, 0x3d, 0x20, 0x5b, 0x5d, 0x3b, 0x0a, 0x20, 0x20, 0x20,
+  0x20, 0x7d, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x67, 0x72, 0x6f, 0x75, 0x70,
+  0x2e, 0x70, 0x75, 0x73, 0x68, 0x28, 0x65, 0x6c, 0x65, 0x6d, 0x65, 0x6e,
+  0x74, 0x29, 0x3b, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x6c, 0x61, 0x73, 0x74,
+  0x4b, 0x65, 0x79, 0x20, 0x3d, 0x20, 0x6b, 0x65, 0x79, 0x3b, 0x0a, 0x20,
+  0x20, 0x7d, 0x0a, 0x20, 0x20, 0x69, 0x66, 0x20, 0x28, 0x67, 0x72, 0x6f,
+  0x75, 0x70, 0x2e, 0x6c, 0x65, 0x6e, 0x67, 0x74, 0x68, 0x20, 0x3e, 0x20,
+  0x30, 0x29, 0x20, 0x7b, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x79, 0x69, 0x65,
+  0x6c, 0x64, 0x20, 0x5b, 0x6c, 0x61, 0x73, 0x74, 0x4b, 0x65, 0x79, 0x2c,
+  0x20, 0x67, 0x72, 0x6f, 0x75, 0x70, 0x5d, 0x3b, 0x0a, 0x20, 0x20, 0x7d,
+  0x0a, 0x7d, 0x0a
 };
-unsigned int json_schema_to_grammar_mjs_len = 21212;
+unsigned int json_schema_to_grammar_mjs_len = 21255;
diff --git a/examples/server/public/json-schema-to-grammar.mjs b/examples/server/public/json-schema-to-grammar.mjs
index 7de315232..90e325b4b 100644
--- a/examples/server/public/json-schema-to-grammar.mjs
+++ b/examples/server/public/json-schema-to-grammar.mjs
@@ -1,11 +1,56 @@
 // WARNING: This file was ported from json_schema_to_grammar.py, please fix bugs / add features there first.
 const SPACE_RULE = '" "?';
 
-function _buildRepetition(content, upToN) {
-  if (upToN === 0) {
-    return '';
+function _buildRepetition(itemRule, minItems, maxItems, opts={}) {
+  const separatorRule = opts.separatorRule ?? '';
+  const itemRuleIsLiteral = opts.itemRuleIsLiteral ?? false
+
+  if (separatorRule === '') {
+    if (minItems === 0 && maxItems === 1) {
+      return `${itemRule}?`;
+    } else if (minItems === 1 && maxItems === undefined) {
+      return `${itemRule}+`;
+    }
   }
-  return `(${content}${upToN > 1 ? ` ${_buildRepetition(content, upToN - 1)}` : ''})?`;
+
+  let result = '';
+  if (minItems > 0) {
+    if (itemRuleIsLiteral && separatorRule === '') {
+      result = `"${itemRule.slice(1, -1).repeat(minItems)}"`;
+    } else {
+      result = Array.from({ length: minItems }, () => itemRule)
+        .join(separatorRule !== '' ? ` ${separatorRule} ` : ' ');
+    }
+  }
+
+  const optRepetitions = (upToN, prefixWithSep=false) => {
+    if (upToN === 0) {
+      return '';
+    }
+    let res = separatorRule !== '' && prefixWithSep ? separatorRule + ' ' + itemRule : itemRule;
+    if (upToN > 1) {
+      res += ' ' + optRepetitions(upToN - 1, true);
+    }
+    return `(${res})?`;
+  };
+
+  if (minItems > 0 && maxItems !== minItems) {
+    result += ' ';
+  }
+
+  if (maxItems !== undefined) {
+    result += optRepetitions(maxItems - minItems, minItems > 0);
+  } else {
+    const itemOperator = `(${separatorRule !== '' ? separatorRule + ' ' : ''}${itemRule})`;
+
+    if (minItems === 0 && separatorRule !== '') {
+      result = `(${itemRule} ${itemOperator}*)?`;
+    } else {
+      result += `${itemOperator}*`;
+    }
+  }
+
+  return result;
 }
 
 class BuiltinRule {
@@ -15,7 +60,7 @@ class BuiltinRule {
   }
 }
 
-const UP_TO_15_DIGITS = _buildRepetition('[0-9]', 15);
+const UP_TO_15_DIGITS = _buildRepetition('[0-9]', 0, 15);
 
 const PRIMITIVE_RULES = {
   boolean        : new BuiltinRule('("true" | "false") space', []),
@@ -276,37 +321,19 @@ export class SchemaConverter {
 
           let [sub, subIsLiteral] = seq[seq.length - 1];
 
-          if (minTimes === 0 && maxTimes === Infinity) {
-            seq[seq.length - 1] = [`${sub}*`, false];
-          } else if (minTimes === 0 && maxTimes === 1) {
-            seq[seq.length - 1] = [`${sub}?`, false];
-          } else if (minTimes === 1 && maxTimes === Infinity) {
-            seq[seq.length - 1] = [`${sub}+`, false];
-          } else {
-            if (!subIsLiteral) {
-              let id = subRuleIds[sub];
-              if (id === undefined) {
-                id = this._addRule(`${name}-${Object.keys(subRuleIds).length + 1}`, sub);
-                subRuleIds[sub] = id;
-              }
-              sub = id;
+          if (!subIsLiteral) {
+            let id = subRuleIds[sub];
+            if (id === undefined) {
+              id = this._addRule(`${name}-${Object.keys(subRuleIds).length + 1}`, sub);
+              subRuleIds[sub] = id;
             }
-
-            let result;
-            if (subIsLiteral && minTimes > 0) {
-              result = `"${sub.slice(1, -1).repeat(minTimes)}"`;
-            } else {
-              result = Array.from({ length: minTimes }, () => sub).join(' ');
-            }
-
-            if (minTimes < maxTimes) {
-              if (minTimes > 0) {
-                result += ' ';
-              }
-              result += _buildRepetition(sub, maxTimes - minTimes);
-            }
-            seq[seq.length - 1] = [result, false];
+            sub = id;
           }
+
+          seq[seq.length - 1] = [
+            _buildRepetition(subIsLiteral ? `"${sub}"` : sub, minTimes, maxTimes, {itemRuleIsLiteral: subIsLiteral}),
+            false
+          ];
         } else {
           let literal = '';
           while (i < length) {
@@ -422,23 +449,9 @@ export class SchemaConverter {
         );
       } else {
         const itemRuleName = this.visit(items, `${name ?? ''}${name ? '-' : ''}item`);
-        const listItemOperator = `( "," space ${itemRuleName} )`;
-        let successiveItems = '';
-        let minItems = schema.minItems || 0;
+        const minItems = schema.minItems || 0;
         const maxItems = schema.maxItems;
-        if (minItems > 0) {
-          successiveItems = listItemOperator.repeat(minItems - 1);
-          minItems--;
-        }
-        if (maxItems !== undefined && maxItems > minItems) {
-          successiveItems += _buildRepetition(listItemOperator, maxItems - minItems - 1);
-        } else {
-          successiveItems += `${listItemOperator}*`;
-        }
-        const rule = minItems === 0
-          ? `"[" space ( ${itemRuleName} ${successiveItems} )? "]" space`
-          : `"[" space ${itemRuleName} ${successiveItems} "]" space`;
-        return this._addRule(ruleName, rule);
+        return this._addRule(ruleName, '"[" space ' + _buildRepetition(itemRuleName, minItems, maxItems, {separatorRule: '"," space'}) + ' "]" space');
       }
     } else if ((schemaType === undefined || schemaType === 'string') && 'pattern' in schema) {
       return this._visitPattern(schema.pattern, ruleName);
diff --git a/tests/test-json-schema-to-grammar.cpp b/tests/test-json-schema-to-grammar.cpp
index f334f9577..314d9a83f 100755
--- a/tests/test-json-schema-to-grammar.cpp
+++ b/tests/test-json-schema-to-grammar.cpp
@@ -282,7 +282,7 @@ static void test_all(const std::string & lang, std::function<void(const TestCase
         })""",
         R"""(
             boolean ::= ("true" | "false") space
-            root ::= "[" space boolean ( "," space boolean )( "," space boolean )* "]" space
+            root ::= "[" space boolean "," space boolean ("," space boolean)* "]" space
             space ::= " "?
         )"""
     });
@@ -298,7 +298,7 @@ static void test_all(const std::string & lang, std::function<void(const TestCase
         })""",
         R"""(
             boolean ::= ("true" | "false") space
-            root ::= "[" space ( boolean  )? "]" space
+            root ::= "[" space (boolean)? "]" space
             space ::= " "?
         )"""
     });
@@ -314,7 +314,7 @@ static void test_all(const std::string & lang, std::function<void(const TestCase
         })""",
         R"""(
             boolean ::= ("true" | "false") space
-            root ::= "[" space ( boolean (( "," space boolean ))? )? "]" space
+            root ::= "[" space (boolean ("," space boolean)?)? "]" space
             space ::= " "?
         )"""
     });
@@ -335,7 +335,7 @@ static void test_all(const std::string & lang, std::function<void(const TestCase
             integral-part ::= [0-9] | [1-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9])?)?)?)?)?)?)?)?)?)?)?)?)?)?)?
             item ::= number | integer
             number ::= ("-"? integral-part) ("." decimal-part)? ([eE] [-+]? integral-part)? space
-            root ::= "[" space item ( "," space item )( "," space item )(( "," space item ) (( "," space item ))?)? "]" space
+            root ::= "[" space item "," space item "," space item ("," space item ("," space item)?)? "]" space
             space ::= " "?
         )"""
     });
@@ -384,11 +384,11 @@ static void test_all(const std::string & lang, std::function<void(const TestCase
         "regexp",
         R"""({
             "type": "string",
-            "pattern": "^(\\([0-9]{1,3}\\))?[0-9]{3}-[0-9]{4} and...$"
+            "pattern": "^(\\([0-9]{1,3}\\))?[0-9]{3}-[0-9]{4} a{3,5}nd...$"
         })""",
         R"""(
             dot ::= [\U00000000-\x09\x0B\x0C\x0E-\U0010FFFF]
-            root ::= "\"" ("(" root-1 (root-1 (root-1)?)? ")")? root-1 root-1 root-1 "-" root-1 root-1 root-1 root-1 " and" dot dot dot "\"" space
+            root ::= "\"" ("(" root-1 (root-1 (root-1)?)? ")")? root-1 root-1 root-1 "-" root-1 root-1 root-1 root-1 " " "aaa" ("a" ("a")?)? "nd" dot dot dot "\"" space
             root-1 ::= [0-9]
             space ::= " "?
         )"""
@@ -511,7 +511,7 @@ static void test_all(const std::string & lang, std::function<void(const TestCase
         R"""(
             additional-kv ::= string ":" space additional-value
             additional-kvs ::= additional-kv ( "," space additional-kv )*
-            additional-value ::= "[" space ( number ( "," space number )* )? "]" space
+            additional-value ::= "[" space (number ("," space number)*)? "]" space
             decimal-part ::= [0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9])?)?)?)?)?)?)?)?)?)?)?)?)?)?)?
             integral-part ::= [0-9] | [1-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9] ([0-9])?)?)?)?)?)?)?)?)?)?)?)?)?)?)?
             number ::= ("-"? integral-part) ("." decimal-part)? ([eE] [-+]? integral-part)? space