Refactor: don't use Stream API functionality or String formatting outside Truffle boundaries.

Concrete refactorings:
- Add self implemented `strToCodePointArray` method to be able to store the line terminator
  of a csv file as a code point array with out relying on the `str.codePoints()` method that
  produces an `IntStream` of code points.
- Add (somewhat) redundant error message for strings displayed with quotes in the error message
  instead of using string concatenation when calling the Error message.

Author: phoeinx

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/csv/CSVDialect.java

@@ -84,6 +84,19 @@ public CSVDialect(Object cls, Shape instanceShape, String delimiter, boolean dou
         this.delimiterCodePoint = this.delimiter == NOT_SET ? NOT_SET_CODEPOINT : this.delimiter.codePointAt(0);
         this.escapeCharCodePoint = this.escapeChar == NOT_SET ? NOT_SET_CODEPOINT : this.escapeChar.codePointAt(0);
         this.quoteCharCodePoint = quoteChar.codePointAt(0); // quote char cannot be NOT_SET
-        this.lineTerminatorCodePoints = this.lineTerminator.codePoints().toArray();
+        this.lineTerminatorCodePoints = strToCodePointArray(this.lineTerminator);
+    }
+
+    private static int[] strToCodePointArray(String str) {
+        final int strLen = str.length();
+        final int codePointCount = str.codePointCount(0, strLen);
+        int[] codePoints = new int[codePointCount];
+
+        for (int offset = 0, index = 0; offset < strLen; index++) {
+            final int c = str.codePointAt(offset);
+            codePoints[index] = c;
+            offset += Character.charCount(c);
+        }
+        return codePoints;
     }
 }

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/csv/CSVModuleBuiltins.java

@@ -572,7 +572,7 @@ private String getString(String attribute, Object valueObj, String defaultValue,
             try {
                 value = castToJavaStringNode.execute(valueObj);
             } catch (CannotCastException e) {
-                throw raise(TypeError, ErrorMessages.MUST_BE_STRING, "\"" + attribute + "\"");
+                throw raise(TypeError, ErrorMessages.MUST_BE_STRING_QUOTED, attribute);
             }
 
             return value;

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/ErrorMessages.java

@@ -441,6 +441,7 @@ public abstract class ErrorMessages {
     public static final String MUST_BE_S_OR_S = "%s must be %s or %s";
     public static final String MUST_BE_SET_TO_S_OBJ = "%s must be set to a %s object";
     public static final String MUST_BE_STRING = "%s must be a string";
+    public static final String MUST_BE_STRING_QUOTED = "\"%s\" must be a string";
     public static final String MUST_BE_STRINGS = "%s must be strings";
     public static final String MUST_BE_STRINGS_NOT_P = "%s must be strings, not %p";
     public static final String MUST_BE_TUPLE_OF_CLASSES_NOT_P = "%s.%s must be tuple of classes, not '%p'";