Improve property name escaping (#1638)

* don't allow "init", "fromJS" or "toJSON" for TypeScript member name
* improve performance by not doing string.Replace unless necessary

src/NJsonSchema.CodeGeneration.CSharp/CSharpPropertyNameGenerator.cs

@@ -9,15 +9,21 @@
 namespace NJsonSchema.CodeGeneration.CSharp
 {
     /// <summary>Generates the property name for a given CSharp <see cref="JsonSchemaProperty"/>.</summary>
-    public class CSharpPropertyNameGenerator : IPropertyNameGenerator
+    public sealed class CSharpPropertyNameGenerator : IPropertyNameGenerator
     {
+        private static readonly char[] _reservedFirstPassChars = { '"', '\'', '@', '?', '!', '$', '[', ']', '(', ')', '.', '=', '+' };
+        private static readonly char[] _reservedSecondPassChars = { '*', ':', '-', '#', '&' };
+
         /// <summary>Generates the property name.</summary>
         /// <param name="property">The property.</param>
         /// <returns>The new name.</returns>
-        public virtual string Generate(JsonSchemaProperty property)
+        public string Generate(JsonSchemaProperty property)
         {
-            return ConversionUtilities.ConvertToUpperCamelCase(property.Name
-                    .Replace("\"", string.Empty)
+            var name = property.Name;
+
+            if (name.IndexOfAny(_reservedFirstPassChars) != -1)
+            {
+                name = name.Replace("\"", string.Empty)
                     .Replace("'", string.Empty)
                     .Replace("@", string.Empty)
                     .Replace("?", string.Empty)
@@ -29,12 +35,22 @@ public virtual string Generate(JsonSchemaProperty property)
                     .Replace(")", string.Empty)
                     .Replace(".", "-")
                     .Replace("=", "-")
-                    .Replace("+", "plus"), true)
-                .Replace("*", "Star")
-                .Replace(":", "_")
-                .Replace("-", "_")
-                .Replace("#", "_")
-                .Replace("&", "And");
+                    .Replace("+", "plus");
+            }
+
+            name = ConversionUtilities.ConvertToUpperCamelCase(name, true);
+
+            if (name.IndexOfAny(_reservedSecondPassChars) != -1)
+            {
+                name = name
+                    .Replace("*", "Star")
+                    .Replace(":", "_")
+                    .Replace("-", "_")
+                    .Replace("#", "_")
+                    .Replace("&", "And");
+            }
+
+            return name;
         }
     }
-}
+}

src/NJsonSchema.CodeGeneration.TypeScript.Tests/PropertyNameTests.cs

@@ -0,0 +1,32 @@
+using System.Threading.Tasks;
+using NJsonSchema.Annotations;
+using NJsonSchema.NewtonsoftJson.Generation;
+using VerifyXunit;
+using Xunit;
+
+using static NJsonSchema.CodeGeneration.TypeScript.Tests.VerifyHelper;
+
+namespace NJsonSchema.CodeGeneration.TypeScript.Tests;
+
+[UsesVerify]
+public class PropertyNameTests
+{
+    private class TypeWithRestrictedProperties
+    {
+        public string Constructor { get; set; }
+        public string Init { get; set; }
+        public string FromJS { get; set; }
+        public string ToJSON { get; set; }
+    }
+
+    [Fact]
+    public async Task When_class_has_restricted_properties_they_are_escaped()
+    {
+        var schema = NewtonsoftJsonSchemaGenerator.FromType<TypeWithRestrictedProperties>();
+
+        var generator = new TypeScriptGenerator(schema, new TypeScriptGeneratorSettings { TypeScriptVersion = 4.3m });
+        var output = generator.GenerateFile(nameof(TypeWithRestrictedProperties));
+
+        await Verify(output);
+    }
+}

src/NJsonSchema.CodeGeneration.TypeScript.Tests/Snapshots/PropertyNameTests.When_class_has_restricted_properties_they_are_escaped.verified.txt

@@ -0,0 +1,58 @@
+//----------------------
+// <auto-generated>
+// </auto-generated>
+//----------------------
+
+
+
+
+
+
+
+export class TypeWithRestrictedProperties implements ITypeWithRestrictedProperties {
+    constructor_!: string | undefined;
+    init_!: string | undefined;
+    fromJS_!: string | undefined;
+    toJSON_!: string | undefined;
+
+    constructor(data?: ITypeWithRestrictedProperties) {
+        if (data) {
+            for (var property in data) {
+                if (data.hasOwnProperty(property))
+                    (<any>this)[property] = (<any>data)[property];
+            }
+        }
+    }
+
+    init(_data?: any) {
+        if (_data) {
+            this.constructor_ = _data["Constructor"];
+            this.init_ = _data["Init"];
+            this.fromJS_ = _data["FromJS"];
+            this.toJSON_ = _data["ToJSON"];
+        }
+    }
+
+    static fromJS(data: any): TypeWithRestrictedProperties {
+        data = typeof data === 'object' ? data : {};
+        let result = new TypeWithRestrictedProperties();
+        result.init(data);
+        return result;
+    }
+
+    toJSON(data?: any) {
+        data = typeof data === 'object' ? data : {};
+        data["Constructor"] = this.constructor_;
+        data["Init"] = this.init_;
+        data["FromJS"] = this.fromJS_;
+        data["ToJSON"] = this.toJSON_;
+        return data;
+    }
+}
+
+export interface ITypeWithRestrictedProperties {
+    constructor_: string | undefined;
+    init_: string | undefined;
+    fromJS_: string | undefined;
+    toJSON_: string | undefined;
+}

src/NJsonSchema.CodeGeneration.TypeScript/TypeScriptPropertyNameGenerator.cs

@@ -6,32 +6,43 @@
 // <author>Rico Suter, [email protected]</author>
 //-----------------------------------------------------------------------
 
+using System;
 using System.Collections.Generic;
-using System.Linq;
 
 namespace NJsonSchema.CodeGeneration.TypeScript
 {
     /// <summary>Generates the property name for a given TypeScript <see cref="JsonSchemaProperty"/>.</summary>
-    public class TypeScriptPropertyNameGenerator : IPropertyNameGenerator
+    public sealed class TypeScriptPropertyNameGenerator : IPropertyNameGenerator
     {
+        private static readonly char[] _reservedFirstPassChars = { '"', '@', '?', '.', '=', '+' };
+        private static readonly char[] _reservedSecondPassChars = { '*', ':', '-' };
+
         /// <summary>Gets or sets the reserved names.</summary>
-        public IEnumerable<string> ReservedPropertyNames { get; set; } = new List<string> { "constructor" };
+        public HashSet<string> ReservedPropertyNames { get; set; } = new(StringComparer.Ordinal) { "constructor", "init", "fromJS", "toJSON" };
 
-        /// <summary>Generates the property name.</summary>
-        /// <param name="property">The property.</param>
-        /// <returns>The new name.</returns>
-        public virtual string Generate(JsonSchemaProperty property)
+        /// <inheritdoc />
+        public string Generate(JsonSchemaProperty property)
         {
-            var name = ConversionUtilities.ConvertToLowerCamelCase(property.Name
-                    .Replace("\"", string.Empty)
+            var name = property.Name;
+
+            if (name.IndexOfAny(_reservedFirstPassChars) != -1)
+            {
+                name = name.Replace("\"", string.Empty)
                     .Replace("@", string.Empty)
                     .Replace("?", string.Empty)
                     .Replace(".", "-")
                     .Replace("=", "-")
-                    .Replace("+", "plus"), true)
-                .Replace("*", "Star")
-                .Replace(":", "_")
-                .Replace("-", "_");
+                    .Replace("+", "plus");
+            }
+
+            name = ConversionUtilities.ConvertToLowerCamelCase(name, true);
+
+            if (name.IndexOfAny(_reservedSecondPassChars) != -1)
+            {
+                name = name.Replace("*", "Star")
+                    .Replace(":", "_")
+                    .Replace("-", "_");
+            }
 
             if (ReservedPropertyNames.Contains(name))
             {

src/NJsonSchema/Generation/SampleJsonDataGenerator.cs

@@ -7,10 +7,8 @@
 //-----------------------------------------------------------------------
 
 using Newtonsoft.Json.Linq;
-using NJsonSchema;
 using System;
 using System.Collections.Generic;
-using System.Globalization;
 using System.Linq;
 
 namespace NJsonSchema.Generation
@@ -133,19 +131,19 @@ private JToken Generate(JsonSchema schema, Stack<JsonSchema> schemaStack)
             }
         }
 
-        private JToken HandleNumberType(JsonSchema schema)
+        private static JToken HandleNumberType(JsonSchema schema)
         {
             if (schema.ExclusiveMinimumRaw?.Equals(true) == true && schema.Minimum != null)
             {
-                return JToken.FromObject(decimal.Parse(schema.Minimum.Value.ToString(CultureInfo.InvariantCulture)) + 0.1m);
+                return JToken.FromObject(schema.Minimum.Value + 0.1m);
             }
             else if (schema.ExclusiveMinimum != null)
             {
-                return JToken.FromObject(decimal.Parse(schema.ExclusiveMinimum.Value.ToString(CultureInfo.InvariantCulture)));
+                return JToken.FromObject(schema.ExclusiveMinimum.Value);
             }
             else if (schema.Minimum.HasValue)
             {
-                return decimal.Parse(schema.Minimum.ToString()!);
+                return schema.Minimum.Value;
             }
             return JToken.FromObject(0.0);
         }
@@ -167,7 +165,7 @@ private JToken HandleIntegerType(JsonSchema schema)
             return JToken.FromObject(0);
         }
 
-        private JToken HandleStringType(JsonSchema schema, JsonSchemaProperty? property)
+        private static JToken HandleStringType(JsonSchema schema, JsonSchemaProperty? property)
         {
             if (schema.Format == JsonFormatStrings.Date)
             {