Merge pull request #28 from mluis7/pxx-19

pxx-19

Author: mluis7

.gitignore

@@ -1,3 +1,4 @@
 /dist/
 src/*.egg-info
 __pycache__/
+/.pytest_cache/

.pydevproject

@@ -1,27 +1,34 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <?eclipse-pydev version="1.0"?><pydev_project>
-                
+                    
+    
 
 
     <pydev_pathproperty name="org.python.pydev.PROJECT_SOURCE_PATH">
-                        
+                                
+        
 
         <path>/${PROJECT_DIR_NAME}/src</path>
-                        
+                                
+        
 
         <path>/${PROJECT_DIR_NAME}/tests</path>
-                    
+                            
+    
 
     </pydev_pathproperty>
-                
+                    
+    
 
 
     <pydev_property name="org.python.pydev.PYTHON_PROJECT_VERSION">python 3.9</pydev_property>
-                
+                    
 
 
-    <pydev_property name="org.python.pydev.PYTHON_PROJECT_INTERPRETER">python3.9</pydev_property>
-            
+    
+    <pydev_property name="org.python.pydev.PYTHON_PROJECT_INTERPRETER">Default</pydev_property>
+                
+
 
 
 </pydev_project>

README.md

@@ -12,6 +12,7 @@ Table of contents
 * [Method parse(...)](#method-parse)
 * [Print result modes](#print-result-modes)
 * [HTML support](#html-support)
+* [Relative expressions](#relative-expressions)
 * [Unqualified vs. Qualified](#unqualified-vs-qualified)
 * [Initial Xpath Examples](#initial-xpath-examples)
 * [Performance](#performance)
@@ -215,6 +216,68 @@ or on command line
 pyxml2xpath tests/resources/html5-small.html.xml 'all' '//*[@id="math"]'
 ```
 
+## Relative expressions
+Build relative expressions when passing `xpath_base` kword argument. The xpath of the parent should be removed so `base_xpath` should be like:
+
+`xpath_base = '//*[@id="math"]/parent::* | //*[@id="math"]/descendant-or-self::*'`
+
+Example:
+
+```python
+from lxml import html
+from xml2xpath import xml2xpath
+
+filepath = 'tests/resources/html5-small.html.xml'
+hdoc = html.parse(filepath)
+
+needle = 'math'
+xpath_base = f'//*[@id="{needle}"]/parent::* | //*[@id="{needle}"]/descendant-or-self::*'
+xmap = xml2xpath.parse(None, itree=hdoc, xpath_base=xpath_base)[2]
+
+rel_xpath = []
+xiter = iter(xmap)
+# parent xpath
+x0 = next(xiter)
+# base element xpath
+x1 = next(xiter)
+# get base element attributes and build a predicate with first
+x1a = ''
+if len(xmap[x1][2]) > 0:
+    x1a = f'[@{xmap[x1][2][0]}="{needle}"]'
+# base element relative xpath (/html/body/math -> //math)
+x1f = x1.replace(x0, '/')
+# remove numeric indexes if any (div[1] -> div)
+x1f = x1f.split('[', 1)[0]
+# add first attribute as predicate
+x1f += x1a
+rel_xpath.append(x1f)
+
+# children relative xpath
+for xs in list(xmap.keys())[2:]:
+    rel_xpath.append(xs.replace(x1, x1f))
+
+for x in rel_xpath:
+    print(x)
+```
+
+Output
+
+```None
+//math[@id='math']
+//math[@id='math']/mrow
+//math[@id='math']/mrow/mi
+//math[@id='math']/mrow/mo
+//math[@id='math']/mrow/mfrac
+//math[@id='math']/mrow/mfrac/mn
+//math[@id='math']/mrow/mfrac/msqrt
+//math[@id='math']/mrow/mfrac/msqrt/mrow
+//math[@id='math']/mrow/mfrac/msqrt/mrow/msup
+//math[@id='math']/mrow/mfrac/msqrt/mrow/msup/mi
+//math[@id='math']/mrow/mfrac/msqrt/mrow/msup/mn
+//math[@id='math']/mrow/mfrac/msqrt/mrow/mo
+//math[@id='math']/mrow/mfrac/msqrt/mrow/mn
+```
+
 ## Unqualified vs. Qualified
 Symbolic element tree of `tests/resources/wiki.xml` showing position of unqualified elements.
 

VERSION

@@ -1 +1 @@
-0.3.3
+0.3.4

pyproject.toml

@@ -9,14 +9,14 @@ dynamic = ["version"]
 dependencies = [
   "lxml"
 ]
-requires-python = ">=3.9, <=11"
+requires-python = ">=3.9"
 authors = [
   {name = "Luis Muñoz", email = "[email protected]"}
 ]
 
-description = "Find xpath expressions from XML document."
+description = "Generate xpath expressions from XML document."
 readme = "README.md"
-license = {file = "LICENSE"}
+license = {text = "GPL-3.0"}
 keywords = ["xpath", "xml"]
 classifiers = [
   "Development Status :: 5 - Production/Stable",