Allow $ in java var name (#200)

modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java

@@ -3320,7 +3320,14 @@ public static String camelize(String word, boolean lowercaseFirstLetter) {
         }
 
         if (lowercaseFirstLetter && word.length() > 0) {
-            word = word.substring(0, 1).toLowerCase() + word.substring(1);
+            int i = 0;
+            char charAt = word.charAt(i);
+            while(i + 1 < word.length() && !((charAt >= 'a' && charAt <= 'z') || (charAt >= 'A' && charAt <= 'Z'))) {
+                i = i + 1;
+                charAt = word.charAt(i);
+            }
+            i = i + 1;
+            word = word.substring(0, i).toLowerCase() + word.substring(i);
         }
 
         // remove all underscore
@@ -3514,6 +3521,17 @@ protected CliOption buildLibraryCliOption(Map<String, String> supportedLibraries
      */
     @SuppressWarnings("static-method")
     public String sanitizeName(String name) {
+        return sanitizeName(name, "\\W");
+    }
+
+    /**
+     * Sanitize name (parameter, property, method, etc)
+     *
+     * @param name string to be sanitize
+     * @param removeCharRegEx a regex containing all char that will be removed
+     * @return sanitized string
+     */
+    public String sanitizeName(String name, String removeCharRegEx) {
         // NOTE: performance wise, we should have written with 2 replaceAll to replace desired
         // character with _ or empty character. Below aims to spell out different cases we've
         // encountered so far and hopefully make it easier for others to add more special
@@ -3553,9 +3571,9 @@ public String sanitizeName(String name) {
         // remove everything else other than word, number and _
         // $php_variable => php_variable
         if (allowUnicodeIdentifiers) { //could be converted to a single line with ?: operator
-            name = Pattern.compile("\\W", Pattern.UNICODE_CHARACTER_CLASS).matcher(name).replaceAll("");
+            name = Pattern.compile(removeCharRegEx, Pattern.UNICODE_CHARACTER_CLASS).matcher(name).replaceAll("");
         } else {
-            name = name.replaceAll("\\W", "");
+            name = name.replaceAll(removeCharRegEx, "");
         }
 
         return name;

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java

@@ -516,7 +516,7 @@ public String toApiFilename(String name) {
     @Override
     public String toVarName(String name) {
         // sanitize name
-        name = sanitizeName(name); // FIXME: a parameter should not be assigned. Also declare the methods parameters as 'final'.
+        name = sanitizeName(name, "\\W-[\\$]"); // FIXME: a parameter should not be assigned. Also declare the methods parameters as 'final'.
 
         if (name.toLowerCase().matches("^_*class$")) {
             return "propertyClass";

modules/openapi-generator/src/test/java/org/openapitools/codegen/DefaultCodegenTest.java

@@ -18,6 +18,23 @@
 
 public class DefaultCodegenTest {
 
+    @Test
+    public void testCamelize() throws Exception {
+        Assert.assertEquals(DefaultCodegen.camelize("abcd"), "Abcd");
+        Assert.assertEquals(DefaultCodegen.camelize("some-value"), "SomeValue");
+        Assert.assertEquals(DefaultCodegen.camelize("some_value"), "SomeValue");
+        Assert.assertEquals(DefaultCodegen.camelize("$type"), "$Type");
+
+        Assert.assertEquals(DefaultCodegen.camelize("abcd", true), "abcd");
+        Assert.assertEquals(DefaultCodegen.camelize("some-value", true), "someValue");
+        Assert.assertEquals(DefaultCodegen.camelize("some_value", true), "someValue");
+        Assert.assertEquals(DefaultCodegen.camelize("Abcd", true), "abcd");
+        Assert.assertEquals(DefaultCodegen.camelize("$type", true), "$type");
+
+        Assert.assertEquals(DefaultCodegen.camelize("123", true), "123");
+        Assert.assertEquals(DefaultCodegen.camelize("$123", true), "$123");
+    }
+
     @Test
     public void testHasBodyParameter() throws Exception {
         final Schema refSchema = new Schema<>().$ref("#/components/schemas/Pet");
@@ -41,7 +58,7 @@ public void testHasBodyParameter() throws Exception {
         Assert.assertEquals(codegen.hasBodyParameter(openAPI, pingOperation), false);
         Assert.assertEquals(codegen.hasBodyParameter(openAPI, createOperation), true);
     }
-    
+
     @Test
     public void testGetConsumesInfoAndGetProducesInfo() throws Exception {
         final DefaultCodegen codegen = new DefaultCodegen();

modules/openapi-generator/src/test/java/org/openapitools/codegen/java/AbstractJavaCodegenTest.java

@@ -49,6 +49,23 @@ public void testPreprocessOpenAPI() throws Exception {
         Assert.assertEquals(openAPI.getPaths().get("/pet").getPost().getExtensions().get("x-accepts"), "application/json");
     }
 
+    @Test
+    public void convertVarName() throws Exception {
+       Assert.assertEquals(fakeJavaCodegen.toVarName("name"), "name");
+       Assert.assertEquals(fakeJavaCodegen.toVarName("$name"), "$name");
+       Assert.assertEquals(fakeJavaCodegen.toVarName("nam$$e"), "nam$$e");
+       Assert.assertEquals(fakeJavaCodegen.toVarName("user-name"), "userName");
+       Assert.assertEquals(fakeJavaCodegen.toVarName("user_name"), "userName");
+   }
+
+   @Test
+   public void convertModelName() throws Exception {
+       Assert.assertEquals(fakeJavaCodegen.toModelName("name"), "Name");
+       Assert.assertEquals(fakeJavaCodegen.toModelName("$name"), "Name");
+       Assert.assertEquals(fakeJavaCodegen.toModelName("nam#e"), "Name");
+       Assert.assertEquals(fakeJavaCodegen.toModelName("$another-fake?"), "AnotherFake");
+   }
+
     @Test
     public void testInitialConfigValues() throws Exception {
         final AbstractJavaCodegen codegen = new P_AbstractJavaCodegen();