From a59e9431fc050f399a652e95d5e04248bac1ccb4 Mon Sep 17 00:00:00 2001
From: ochafik <ochafik@google.com>
Date: Mon, 8 Apr 2024 20:02:18 +0100
Subject: [PATCH] json: optimize repetitions for minItems/maxItems and regexps:
 `a{,3}` goes from `"a"? "a"? "a"?` (explosive combos) to `(a (a (a)?)?)?`

---
 common/json-schema-to-grammar.cpp             |   26 +-
 examples/json_schema_to_grammar.py            |   28 +-
 .../server/json-schema-to-grammar.mjs.hpp     | 3303 +++++++++--------
 .../server/public/json-schema-to-grammar.mjs  |   26 +-
 tests/test-json-schema-to-grammar.cpp         |    6 +-
 5 files changed, 1730 insertions(+), 1659 deletions(-)

diff --git a/common/json-schema-to-grammar.cpp b/common/json-schema-to-grammar.cpp
index 02bf1c2ec..659a16249 100644
--- a/common/json-schema-to-grammar.cpp
+++ b/common/json-schema-to-grammar.cpp
@@ -11,6 +11,23 @@
 
 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;
+        }
+        out << "(" << content;
+        if (n > 1) {
+            out << " ";
+            aux(n - 1);
+        }
+        out << ")?";
+    };
+    aux(upToN);
+    return out.str();
+}
+
 const std::string SPACE_RULE = "\" \"?";
 
 struct BuiltinRule {
@@ -343,12 +360,7 @@ private:
                         if (max_times == std::numeric_limits<int>::max()) {
                             result += sub + "*";
                         } else {
-                            for (int j = min_times; j < max_times; j++) {
-                                if (j > min_times) {
-                                    result += " ";
-                                }
-                                result += sub + "?";
-                            }
+                            result += build_repetition(sub, max_times - min_times);
                         }
                         seq.back().first = result;
                         seq.back().second = false;
@@ -680,7 +692,7 @@ public:
                     min_items--;
                 }
                 if (max_items >= 0 && max_items > min_items) {
-                    successive_items += repeat(list_item_operator + "?", max_items - min_items - 1);
+                    successive_items += build_repetition(list_item_operator, max_items - min_items - 1);
                 } else {
                     successive_items += list_item_operator + "*";
                 }
diff --git a/examples/json_schema_to_grammar.py b/examples/json_schema_to_grammar.py
index f370ccf0e..d4daa1328 100755
--- a/examples/json_schema_to_grammar.py
+++ b/examples/json_schema_to_grammar.py
@@ -6,6 +6,12 @@ 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 ""})?'
+
 class BuiltinRule:
     def __init__(self, content: str, deps: list[str] = None):
         self.content = content
@@ -277,10 +283,13 @@ 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:
@@ -290,12 +299,17 @@ class SchemaConverter:
                                 sub_rule_ids[sub] = id
                             sub = id
 
-                        seq[-1] = (
-                            ' '.join(
-                                ([f'"{sub[1:-1] * min_times}"'] if sub_is_literal else [sub] * min_times) +
-                                ([f'{sub}?'] * (max_times - min_times) if max_times is not None else [f'{sub}*'])),
-                            False
-                        )
+                        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)
                 else:
                     literal = ''
                     while i < length:
@@ -411,7 +425,7 @@ class SchemaConverter:
                     successive_items = list_item_operator * (min_items - 1)
                     min_items -= 1
                 if max_items is not None and max_items > min_items:
-                    successive_items += (list_item_operator + "?") * (max_items - min_items - 1)
+                    successive_items += _build_repetition(list_item_operator, max_items - min_items - 1)
                 else:
                     successive_items += list_item_operator + "*"
                 if min_items == 0:
diff --git a/examples/server/json-schema-to-grammar.mjs.hpp b/examples/server/json-schema-to-grammar.mjs.hpp
index 257a264bb..688f6acaa 100644
--- a/examples/server/json-schema-to-grammar.mjs.hpp
+++ b/examples/server/json-schema-to-grammar.mjs.hpp
@@ -10,1715 +10,1742 @@ unsigned char json_schema_to_grammar_mjs[] = {
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+  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,
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   0x4b, 0x65, 0x79, 0x2c, 0x20, 0x67, 0x72, 0x6f, 0x75, 0x70, 0x5d, 0x3b,
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-  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
+  0x0a, 0x20, 0x20, 0x7d, 0x0a, 0x7d, 0x0a
 };
-unsigned int json_schema_to_grammar_mjs_len = 20641;
+unsigned int json_schema_to_grammar_mjs_len = 20971;
diff --git a/examples/server/public/json-schema-to-grammar.mjs b/examples/server/public/json-schema-to-grammar.mjs
index 1c61488fb..7838a79fd 100644
--- a/examples/server/public/json-schema-to-grammar.mjs
+++ b/examples/server/public/json-schema-to-grammar.mjs
@@ -1,6 +1,13 @@
 // 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 '';
+  }
+  return `(${content}${upToN > 1 ? ` ${_buildRepetition(content, upToN - 1)}` : ''})?`;
+}
+
 class BuiltinRule {
   constructor(content, deps) {
     this.content = content;
@@ -281,9 +288,20 @@ export class SchemaConverter {
               sub = id;
             }
 
-            const repeatedSub = Array.from({ length: minTimes }, () => subIsLiteral ? `"${sub.slice(1, -1).repeat(minTimes)}"` : sub);
-            const optionalSub = maxTimes !== undefined ? Array.from({ length: maxTimes - minTimes }, () => `${sub}?`) : [`${sub}*`];
-            seq[seq.length - 1] = [repeatedSub.concat(optionalSub).join(' '), false];
+            let result;
+            if (subIsLiteral && minTimes > 0) {
+              result = `"${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];
           }
         } else {
           let literal = '';
@@ -409,7 +427,7 @@ export class SchemaConverter {
           minItems--;
         }
         if (maxItems !== undefined && maxItems > minItems) {
-          successiveItems += `${listItemOperator}?`.repeat(maxItems - minItems - 1);
+          successiveItems += _buildRepetition(listItemOperator, maxItems - minItems - 1);
         } else {
           successiveItems += `${listItemOperator}*`;
         }
diff --git a/tests/test-json-schema-to-grammar.cpp b/tests/test-json-schema-to-grammar.cpp
index 9a0ba13bb..9adb41569 100755
--- a/tests/test-json-schema-to-grammar.cpp
+++ b/tests/test-json-schema-to-grammar.cpp
@@ -307,7 +307,7 @@ 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 ::= " "?
         )"""
     });
@@ -326,7 +326,7 @@ static void test_all(const std::string & lang, std::function<void(const TestCase
             integer ::= ("-"? ([0-9] | [1-9] [0-9]*)) space
             item ::= number | integer
             number ::= ("-"? ([0-9] | [1-9] [0-9]*)) ("." [0-9]+)? ([eE] [-+]? [0-9]+)? 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 ::= " "?
         )"""
     });
@@ -379,7 +379,7 @@ static void test_all(const std::string & lang, std::function<void(const TestCase
         })""",
         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 " and" dot dot dot "\"" space
             root-1 ::= [0-9]
             space ::= " "?
         )"""