Merge pull request #20 from mutpy/feature/python3.8-support

Add support for Python 3.8

.travis.yml

@@ -2,15 +2,12 @@ language: python
 
 matrix:
   include:
-  - python: 2.6
   - python: 2.7
-  - python: 3.3
   - python: 3.4
   - python: 3.5
   - python: 3.6
   - python: 3.7
-    dist: xenial
-    sudo: true
+  - python: 3.8
 install:
 # python 2.6 and 3.3 compatibility
 - if [[ $TRAVIS_PYTHON_VERSION == 2.6 ]]; then pip install pycparser==2.14 cryptography==2.1.4; fi

astmonkey/tests/test_visitors.py

@@ -1,4 +1,6 @@
 # -*- coding: utf-8 -*-
+import sys
+
 import pytest
 
 try:
@@ -34,7 +36,10 @@ def test_node_label(self, visitor):
         visitor.visit(node)
 
         dot_node = visitor.graph.get_node(str(node.body[0].value))[0]
-        assert dot_node.get_label() == 'ast.Num(n=1)'
+        if sys.version_info >= (3, 8):
+            assert dot_node.get_label() == 'ast.Constant(value=1, kind=None)'
+        else:
+            assert dot_node.get_label() == 'ast.Num(n=1)'
 
     def test_edge_label(self, visitor):
         node = transformers.ParentChildNodeTransformer().visit(ast.parse('x = 1'))
@@ -350,6 +355,16 @@ class TestSourceGeneratorNodeVisitor(object):
             "f'{x!a}'",
         ]
 
+    if utils.check_version(from_inclusive=(3, 8)):
+        roundtrip_testdata += [
+            # assignment expressions
+            'if n := len(a) > 10:' + EOL + INDENT + PASS,
+            # positional-only parameters
+            'def f(a, /, b, *, c):' + EOL + INDENT + PASS,
+            # positional-only parameters with defaults
+            'def f(a=1, /, b=2, *, c=3):' + EOL + INDENT + PASS,
+        ]
+
     # add additional tests for semantic testing
     semantic_testdata = list(roundtrip_testdata)
 

astmonkey/visitors.py

@@ -1013,6 +1013,51 @@ def visit_FormattedValue(self, node):
                     self.write('!%c' % (node.conversion,))
 
 
+class SourceGeneratorNodeVisitorPython38(SourceGeneratorNodeVisitorPython36):
+    __python_version__ = (3, 8)
+
+    def visit_Constant(self, node):
+        if type(node.value) == str:
+            self.write(repr(node.s))
+        elif node.value == Ellipsis:
+            self.write('...')
+        else:
+            self.write(str(node.value))
+
+    def visit_NamedExpr(self, node):
+        self.visit(node.target)
+        self.write(' := ')
+        self.visit(node.value)
+
+    def signature(self, node, add_space=False):
+        write_comma = CommaWriter(self.write, add_space_at_beginning=add_space)
+
+
+        defaults = list(node.defaults)
+
+        if node.posonlyargs:
+            padding = [None] * (len(node.posonlyargs) - len(node.defaults))
+            for arg, default in zip(node.posonlyargs, padding + defaults[:len(node.posonlyargs)]):
+                self.signature_arg(arg, default, write_comma)
+            self.write(', /')
+            defaults = defaults[len(node.posonlyargs):]
+
+        padding = [None] * (len(node.args) - len(node.defaults))
+        for arg, default in zip(node.args, padding + defaults):
+            self.signature_arg(arg, default, write_comma)
+
+        self.signature_spec_arg(node, 'vararg', write_comma, prefix='*')
+        self.signature_kwonlyargs(node, write_comma)
+        self.signature_spec_arg(node, 'kwarg', write_comma, prefix='**')
+
+    @classmethod
+    def _get_actual_lineno(cls, node):
+        if isinstance(node, ast.FunctionDef) and node.decorator_list:
+            return node.decorator_list[0].lineno
+        else:
+            return SourceGeneratorNodeVisitorPython36._get_actual_lineno(node)
+
+
 SourceGeneratorNodeVisitor = utils.get_by_python_version([
     SourceGeneratorNodeVisitorPython26,
     SourceGeneratorNodeVisitorPython27,
@@ -1022,5 +1067,6 @@ def visit_FormattedValue(self, node):
     SourceGeneratorNodeVisitorPython33,
     SourceGeneratorNodeVisitorPython34,
     SourceGeneratorNodeVisitorPython35,
-    SourceGeneratorNodeVisitorPython36
+    SourceGeneratorNodeVisitorPython36,
+    SourceGeneratorNodeVisitorPython38
 ])

setup.py

@@ -24,6 +24,8 @@
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
         'License :: OSI Approved :: Apache Software License'
     ]
 )

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 envlist =
     coverage-erase
-    test-py{26,27,33,34,35,36,37}
+    test-py{27,34,35,36,37,38}
     coverage-report
 [testenv]
 deps=