[pypy-commit] pypy default: Support different precision float formatting. Accompanying test isn't very good, but there was none before.

[ademan]

Author: Daniel Roberts <ademan...@gmail.com>
Branch: 
Changeset: r45330:53da334735e9
Date: 2011-07-04 00:39 -0700
http://bitbucket.org/pypy/pypy/changeset/53da334735e9/

Log:    Support different precision float formatting. Accompanying test
        isn't very good, but there was none before.

diff --git a/pypy/translator/jvm/src/pypy/PyPy.java 
b/pypy/translator/jvm/src/pypy/PyPy.java
--- a/pypy/translator/jvm/src/pypy/PyPy.java
+++ b/pypy/translator/jvm/src/pypy/PyPy.java
@@ -969,7 +969,10 @@
         // XXX: this is really a quick hack to make things work.
         // it should disappear, because this function is not
         // supported by ootypesystem.
-        return Double.toString(d); // XXX: we are ignoring "format"
+        DecimalFormat format = new DecimalFormat("0.###");
+        format.setMinimumFractionDigits(precision);
+        format.setMaximumFractionDigits(precision);
+        return format.format(d);
     }
 
     // ----------------------------------------------------------------------
diff --git a/pypy/translator/jvm/test/test_float.py 
b/pypy/translator/jvm/test/test_float.py
--- a/pypy/translator/jvm/test/test_float.py
+++ b/pypy/translator/jvm/test/test_float.py
@@ -22,3 +22,14 @@
 
     def test_r_singlefloat(self):
         py.test.skip("not implemented: single-precision floats")
+
+    def test_format_float(self):
+        from pypy.rlib.rfloat import _formatd
+        def fn(precision):
+            return _formatd(10.01, 'd', precision, 0)
+
+        res = self.interpret(fn, [2])
+        assert res == "10.01"
+
+        res = self.interpret(fn, [1])
+        assert res == "10.0"
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