Added startIndex to StartsWith. Resolves #288.

stringbuilder.mod/common.bmx

@@ -1,4 +1,4 @@
-' Copyright (c) 2018-2022 Bruce A Henderson
+' Copyright (c) 2018-2023 Bruce A Henderson
 ' 
 ' This software is provided 'as-is', without any express or implied
 ' warranty. In no event will the authors be held liable for any damages
@@ -34,7 +34,7 @@ Extern
 	Function bmx_stringbuilder_reverse(buffer:Byte Ptr)
 	Function bmx_stringbuilder_substring:String(buffer:Byte Ptr, beginIndex:Int, endIndex:Int)
 	Function bmx_stringbuilder_append_stringbuffer(buffer:Byte Ptr, buffer2:Byte Ptr)
-	Function bmx_stringbuilder_startswith:Int(buffer:Byte Ptr, subString:String)
+	Function bmx_stringbuilder_startswith:Int(buffer:Byte Ptr, subString:String, startIndex:Int)
 	Function bmx_stringbuilder_endswith:Int(buffer:Byte Ptr, subString:String)
 	Function bmx_stringbuilder_find:Int(buffer:Byte Ptr, subString:String, startIndex:Int)
 	Function bmx_stringbuilder_findlast:Int(buffer:Byte Ptr, subString:String, startIndex:Int)

stringbuilder.mod/glue.c

@@ -1,5 +1,5 @@
 /*
-  Copyright (c) 2018-2022 Bruce A Henderson
+  Copyright (c) 2018-2023 Bruce A Henderson
   
   This software is provided 'as-is', without any express or implied
   warranty. In no event will the authors be held liable for any damages
@@ -185,9 +185,13 @@ int bmx_stringbuilder_matches(struct MaxStringBuilder * buf, int offset, BBStrin
 	return 1;
 }
 
-int bmx_stringbuilder_startswith(struct MaxStringBuilder * buf, BBString * subString) {
-	if (subString->length <= buf->count) {
-		return bmx_stringbuilder_matches(buf, 0, subString);
+int bmx_stringbuilder_startswith(struct MaxStringBuilder * buf, BBString * subString, int startIndex) {
+	if (startIndex < 0) {
+		startIndex = 0;
+	}
+
+	if ((startIndex + subString->length) <= buf->count) {
+		return bmx_stringbuilder_matches(buf, startIndex, subString);
 	}
 	return 0;
 }

stringbuilder.mod/glue.h

@@ -1,5 +1,5 @@
 /*
-  Copyright (c) 2018-2022 Bruce A Henderson
+  Copyright (c) 2018-2023 Bruce A Henderson
   
   This software is provided 'as-is', without any express or implied
   warranty. In no event will the authors be held liable for any damages
@@ -51,7 +51,7 @@ void bmx_stringbuilder_reverse(struct MaxStringBuilder * buf);
 BBString * bmx_stringbuilder_substring(struct MaxStringBuilder * buf, int beginIndex, int endIndex);
 void bmx_stringbuilder_append_stringbuffer(struct MaxStringBuilder * buf, struct MaxStringBuilder * other);
 int bmx_stringbuilder_matches(struct MaxStringBuilder * buf, int offset, BBString * subString);
-int bmx_stringbuilder_startswith(struct MaxStringBuilder * buf, BBString * subString);
+int bmx_stringbuilder_startswith(struct MaxStringBuilder * buf, BBString * subString, int startIndex);
 int bmx_stringbuilder_endswith(struct MaxStringBuilder * buf, BBString * subString);
 int bmx_stringbuilder_find(struct MaxStringBuilder * buf, BBString * subString, int startIndex);
 int bmx_stringbuilder_findlast(struct MaxStringBuilder * buf, BBString * subString, int startIndex);

stringbuilder.mod/stringbuilder.bmx

@@ -1,4 +1,4 @@
-' Copyright (c) 2018-2022 Bruce A Henderson
+' Copyright (c) 2018-2023 Bruce A Henderson
 ' 
 ' This software is provided 'as-is', without any express or implied
 ' warranty. In no event will the authors be held liable for any damages
@@ -23,10 +23,12 @@ bbdoc: A string builder.
 End Rem	
 Module BRL.StringBuilder
 
-ModuleInfo "Version: 1.17"
+ModuleInfo "Version: 1.18"
 ModuleInfo "License: zlib/libpng"
-ModuleInfo "Copyright: 2018-2022 Bruce A Henderson"
+ModuleInfo "Copyright: 2018-2023 Bruce A Henderson"
 
+ModuleInfo "History: 1.18"
+ModuleInfo "History: Added optional startIndex to StartsWith()."
 ModuleInfo "History: 1.17"
 ModuleInfo "History: Added AppendCStringBytes() method."
 ModuleInfo "History: 1.16"
@@ -680,10 +682,10 @@ Public
 	End Method
 	
 	Rem
-	bbdoc: Returns true if string starts with @subString.
+	bbdoc: Returns #True if string starts with @prefix.
 	End Rem
-	Method StartsWith:Int(subString:String)
-		Return bmx_stringbuilder_startswith(buffer, subString)
+	Method StartsWith:Int(prefix:String, startIndex:Int = 0)
+		Return bmx_stringbuilder_startswith(buffer, prefix, startIndex)
 	End Method
 	
 	Rem

stringbuilder.mod/tests/test.bmx

@@ -179,4 +179,12 @@ Type TStringBuilderTest Extends TTest
 		MemFree(buf)
 	End Method
 
+	Method testStartsWith() { test }
+		sb.Append("Hello World")
+		assertTrue( sb.StartsWith("Hello") )
+		assertFalse( sb.StartsWith("hello") )
+		assertFalse( sb.StartsWith("World") )
+		assertTrue( sb.StartsWith("World", 6) )
+	End Method
+
 End Type