Use relative references for repeats only.

Fix XLSForm#4

pyxform/survey.py

@@ -29,6 +29,21 @@ def register_nsmap():
 register_nsmap()
 
 
+def is_parent_a_repeat(survey, xpath):
+    """
+    Given a survey object and an xpath returns True if any parent is a repeat.
+    """
+    parent_xpath = '/'.join(xpath.split('/')[:-1])
+    if not parent_xpath:
+        return False
+
+    repeats = [
+        item for item in survey.iter_descendants()
+        if item.get_xpath() == parent_xpath and item.type == 'repeat']
+
+    return any(repeats) or is_parent_a_repeat(survey, parent_xpath)
+
+
 class Survey(Section):
 
     FIELDS = Section.FIELDS.copy()
@@ -626,6 +641,9 @@ def _var_repl_function(self, matchobj):
         if self._xpath[name] is None:
             raise PyXFormError(intro + " There are multiple survey elements"
                                " with this name.")
+        # is parent a repeat?
+        if is_parent_a_repeat(self, self._xpath[name]):
+            return " current()/../" + name + " "
 
         return " " + self._xpath[name] + " "
 

pyxform/tests_v1/test_repeat.py

@@ -0,0 +1,57 @@
+# -*- coding: utf-8 -*-
+"""
+test_repeat.py
+"""
+from pyxform.tests_v1.pyxform_test_case import PyxformTestCase
+
+
+class TestRepeat(PyxformTestCase):
+    """
+    TestRepeat class.
+    """
+    def test_repeat_relative_reference(self):
+        """
+        Test relative reference in repeats.
+        """
+        self.assertPyxformXform(
+            debug=True,
+            name="test_repeat",
+            md="""
+                | survey |              |          |            |           |
+                |        | type         | name     | relevant   | label     |
+                |        | text         | Z        |            | Fruit     |
+                |        | begin repeat | section  |            | Section   |
+                |        | text         | A        |            | A         |
+                |        | text         | B        | ${A}='oat' | B w ${A}  |
+                |        | end repeat   |          |            |           |
+                |        | begin repeat | section2 |            | Section 2 |
+                |        | text         | C        |            | C         |
+                |        | begin group  | sectiona |            | Section A |
+                |        | text         | D        |            | D         |
+                |        | text         | E        | ${D}='oat' | E w ${Z}  |
+                |        | end group    |          |            |           |
+                |        | end repeat   |          |            |           |
+                """,
+            instance__contains=[
+                '<section jr:template="">',
+                '<A/>',
+                '<B/>',
+                '</section>',
+                ],
+            model__contains=[
+                """<bind nodeset="/test_repeat/section/A" """
+                """type="string"/>""",
+                """<bind nodeset="/test_repeat/section/B" """
+                """relevant=" current()/../A ='oat'" """
+                """type="string"/>""",
+                """<bind nodeset="/test_repeat/section2/sectiona/E" """
+                """relevant=" current()/../D ='oat'" type="string"/>"""
+                ],
+            xml__contains=[
+                '<group ref="/test_repeat/section">',
+                '<label>Section</label>',
+                '</group>',
+                """<label> B w <output value=" current()/../A "/> </label>""",
+                """<label> E w <output value=" /test_repeat/Z "/> </label>"""
+            ],
+        )