#! /usr/bin/env python3
#
# Protocol Buffers - Google's data interchange format
# Copyright 2015 Google Inc.  All rights reserved.
#
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file or at
# https://developers.google.com/open-source/licenses/bsd

"""Tests for pddm.py."""

import io
import unittest

from objectivec.DevTools import pddm


class TestParsingMacros(unittest.TestCase):

  def testParseEmpty(self):
    f = io.StringIO('')
    result = pddm.MacroCollection(f)
    self.assertEqual(len(result._macros), 0)

  def testParseOne(self):
    f = io.StringIO("""PDDM-DEFINE foo( )
body""")
    result = pddm.MacroCollection(f)
    self.assertEqual(len(result._macros), 1)
    macro = result._macros.get('foo')
    self.assertIsNotNone(macro)
    self.assertEqual(macro.name, 'foo')
    self.assertEqual(macro.args, tuple())
    self.assertEqual(macro.body, 'body')

  def testParseGeneral(self):
    # Tests multiple defines, spaces in all places, etc.
    f = io.StringIO("""
PDDM-DEFINE noArgs( )
body1
body2

PDDM-DEFINE-END

PDDM-DEFINE oneArg(foo)
body3
PDDM-DEFINE  twoArgs( bar_ , baz )
body4
body5""")
    result = pddm.MacroCollection(f)
    self.assertEqual(len(result._macros), 3)
    macro = result._macros.get('noArgs')
    self.assertIsNotNone(macro)
    self.assertEqual(macro.name, 'noArgs')
    self.assertEqual(macro.args, tuple())
    self.assertEqual(macro.body, 'body1\nbody2\n')
    macro = result._macros.get('oneArg')
    self.assertIsNotNone(macro)
    self.assertEqual(macro.name, 'oneArg')
    self.assertEqual(macro.args, ('foo',))
    self.assertEqual(macro.body, 'body3')
    macro = result._macros.get('twoArgs')
    self.assertIsNotNone(macro)
    self.assertEqual(macro.name, 'twoArgs')
    self.assertEqual(macro.args, ('bar_', 'baz'))
    self.assertEqual(macro.body, 'body4\nbody5')
    # Add into existing collection
    f = io.StringIO("""
PDDM-DEFINE another(a,b,c)
body1
body2""")
    result.ParseInput(f)
    self.assertEqual(len(result._macros), 4)
    macro = result._macros.get('another')
    self.assertIsNotNone(macro)
    self.assertEqual(macro.name, 'another')
    self.assertEqual(macro.args, ('a', 'b', 'c'))
    self.assertEqual(macro.body, 'body1\nbody2')

  def testParseDirectiveIssues(self):
    test_list = [
      # Unknown directive
      ('PDDM-DEFINE foo()\nbody\nPDDM-DEFINED foo\nbaz',
       'Hit a line with an unknown directive: '),
      # End without begin
      ('PDDM-DEFINE foo()\nbody\nPDDM-DEFINE-END\nPDDM-DEFINE-END\n',
       'Got DEFINE-END directive without an active macro: '),
      # Line not in macro block
      ('PDDM-DEFINE foo()\nbody\nPDDM-DEFINE-END\nmumble\n',
       'Hit a line that wasn\'t a directive and no open macro definition: '),
      # Redefine macro
      ('PDDM-DEFINE foo()\nbody\nPDDM-DEFINE foo(a)\nmumble\n',
       'Attempt to redefine macro: '),
    ]
    for idx, (input_str, expected_prefix) in enumerate(test_list, 1):
      f = io.StringIO(input_str)
      try:
        result = pddm.MacroCollection(f)
        self.fail('Should throw exception, entry %d' % idx)
      except pddm.PDDMError as e:
        self.assertTrue(e.message.startswith(expected_prefix),
                        'Entry %d failed: %r' % (idx, e))

  def testParseBeginIssues(self):
    test_list = [
      # 1. No name
      ('PDDM-DEFINE\nmumble',
       'Failed to parse macro definition: '),
      # 2. No name (with spaces)
      ('PDDM-DEFINE  \nmumble',
       'Failed to parse macro definition: '),
      # 3. No open paren
      ('PDDM-DEFINE  foo\nmumble',
       'Failed to parse macro definition: '),
      # 4. No close paren
      ('PDDM-DEFINE foo(\nmumble',
       'Failed to parse macro definition: '),
      # 5. No close paren (with args)
      ('PDDM-DEFINE foo(a, b\nmumble',
       'Failed to parse macro definition: '),
      # 6. No name before args
      ('PDDM-DEFINE  (a, b)\nmumble',
       'Failed to parse macro definition: '),
      # 7. No name before args
      ('PDDM-DEFINE foo bar(a, b)\nmumble',
       'Failed to parse macro definition: '),
      # 8. Empty arg name
      ('PDDM-DEFINE foo(a, ,b)\nmumble',
       'Empty arg name in macro definition: '),
      ('PDDM-DEFINE foo(a,,b)\nmumble',
       'Empty arg name in macro definition: '),
      # 10. Duplicate name
      ('PDDM-DEFINE foo(a,b,a,c)\nmumble',
       'Arg name "a" used more than once in macro definition: '),
      # 11. Invalid arg name
      ('PDDM-DEFINE foo(a b,c)\nmumble',
       'Invalid arg name "a b" in macro definition: '),
      ('PDDM-DEFINE foo(a.b,c)\nmumble',
       'Invalid arg name "a.b" in macro definition: '),
      ('PDDM-DEFINE foo(a-b,c)\nmumble',
       'Invalid arg name "a-b" in macro definition: '),
      ('PDDM-DEFINE foo(a,b,c.)\nmumble',
       'Invalid arg name "c." in macro definition: '),
      # 15. Extra stuff after the name
      ('PDDM-DEFINE foo(a,c) foo\nmumble',
       'Failed to parse macro definition: '),
      ('PDDM-DEFINE foo(a,c) foo)\nmumble',
       'Failed to parse macro definition: '),
    ]
    for idx, (input_str, expected_prefix) in enumerate(test_list, 1):
      f = io.StringIO(input_str)
      try:
        result = pddm.MacroCollection(f)
        self.fail('Should throw exception, entry %d' % idx)
      except pddm.PDDMError as e:
        self.assertTrue(e.message.startswith(expected_prefix),
                        'Entry %d failed: %r' % (idx, e))


class TestExpandingMacros(unittest.TestCase):

  def testExpandBasics(self):
    f = io.StringIO("""
PDDM-DEFINE noArgs( )
body1
body2

PDDM-DEFINE-END

PDDM-DEFINE oneArg(a)
body3 a

PDDM-DEFINE-END

PDDM-DEFINE twoArgs(b,c)
body4 b c
body5
PDDM-DEFINE-END

""")
    mc = pddm.MacroCollection(f)
    test_list = [
      ('noArgs()',
       'body1\nbody2\n'),
      ('oneArg(wee)',
       'body3 wee\n'),
      ('twoArgs(having some, fun)',
       'body4 having some fun\nbody5'),
      # One arg, pass empty.
      ('oneArg()',
       'body3 \n'),
      # Two args, gets empty in each slot.
      ('twoArgs(, empty)',
       'body4  empty\nbody5'),
      ('twoArgs(empty, )',
       'body4 empty \nbody5'),
      ('twoArgs(, )',
       'body4  \nbody5'),
    ]
    for idx, (input_str, expected) in enumerate(test_list, 1):
      result = mc.Expand(input_str)
      self.assertEqual(result, expected,
                       'Entry %d --\n       Result: %r\n     Expected: %r' %
                       (idx, result, expected))

  def testExpandArgOptions(self):
    f = io.StringIO("""
PDDM-DEFINE bar(a)
a-a$S-a$l-a$L-a$u-a$U
PDDM-DEFINE-END
""")
    mc = pddm.MacroCollection(f)

    self.assertEqual(mc.Expand('bar(xYz)'), 'xYz-   -xYz-xyz-XYz-XYZ')
    self.assertEqual(mc.Expand('bar(MnoP)'), 'MnoP-    -mnoP-mnop-MnoP-MNOP')
    # Test empty
    self.assertEqual(mc.Expand('bar()'), '-----')

  def testExpandSimpleMacroErrors(self):
    f = io.StringIO("""
PDDM-DEFINE foo(a, b)
<a-z>
PDDM-DEFINE baz(a)
a - a$z
""")
    mc = pddm.MacroCollection(f)
    test_list = [
      # 1. Unknown macro
      ('bar()',
       'No macro named "bar".'),
      ('bar(a)',
       'No macro named "bar".'),
      # 3. Arg mismatch
      ('foo()',
       'Expected 2 args, got: "foo()".'),
      ('foo(a b)',
       'Expected 2 args, got: "foo(a b)".'),
      ('foo(a,b,c)',
       'Expected 2 args, got: "foo(a,b,c)".'),
      # 6. Unknown option in expansion
      ('baz(mumble)',
       'Unknown arg option "a$z" while expanding "baz(mumble)".'),
    ]
    for idx, (input_str, expected_err) in enumerate(test_list, 1):
      try:
        result = mc.Expand(input_str)
        self.fail('Should throw exception, entry %d' % idx)
      except pddm.PDDMError as e:
        self.assertEqual(e.message, expected_err,
                        'Entry %d failed: %r' % (idx, e))

  def testExpandReferences(self):
    f = io.StringIO("""
PDDM-DEFINE StartIt()
foo(abc, def)
foo(ghi, jkl)
PDDM-DEFINE foo(a, b)
bar(a, int)
bar(b, NSString *)
PDDM-DEFINE bar(n, t)
- (t)n;
- (void)set##n$u##:(t)value;

""")
    mc = pddm.MacroCollection(f)
    expected = """- (int)abc;
- (void)setAbc:(int)value;

- (NSString *)def;
- (void)setDef:(NSString *)value;

- (int)ghi;
- (void)setGhi:(int)value;

- (NSString *)jkl;
- (void)setJkl:(NSString *)value;
"""
    self.assertEqual(mc.Expand('StartIt()'), expected)

  def testCatchRecursion(self):
    f = io.StringIO("""
PDDM-DEFINE foo(a, b)
bar(1, a)
bar(2, b)
PDDM-DEFINE bar(x, y)
foo(x, y)
""")
    mc = pddm.MacroCollection(f)
    try:
      result = mc.Expand('foo(A,B)')
      self.fail('Should throw exception! Test failed to catch recursion.')
    except pddm.PDDMError as e:
      self.assertEqual(e.message,
                       'Found macro recursion, invoking "foo(1, A)":\n...while expanding "bar(1, A)".\n...while expanding "foo(A,B)".')


class TestParsingSource(unittest.TestCase):

  def testBasicParse(self):
    test_list = [
      # 1. no directives
      ('a\nb\nc',
       (3,) ),
      # 2. One define
      ('a\n//%PDDM-DEFINE foo()\n//%body\nc',
       (1, 2, 1) ),
      # 3. Two defines
      ('a\n//%PDDM-DEFINE foo()\n//%body\n//%PDDM-DEFINE bar()\n//%body2\nc',
       (1, 4, 1) ),
      # 4. Two defines with ends
      ('a\n//%PDDM-DEFINE foo()\n//%body\n//%PDDM-DEFINE-END\n'
       '//%PDDM-DEFINE bar()\n//%body2\n//%PDDM-DEFINE-END\nc',
       (1, 6, 1) ),
      # 5. One expand, one define (that runs to end of file)
      ('a\n//%PDDM-EXPAND foo()\nbody\n//%PDDM-EXPAND-END\n'
       '//%PDDM-DEFINE bar()\n//%body2\n',
       (1, 1, 2) ),
      # 6. One define ended with an expand.
      ('a\nb\n//%PDDM-DEFINE bar()\n//%body2\n'
       '//%PDDM-EXPAND bar()\nbody2\n//%PDDM-EXPAND-END\n',
       (2, 2, 1) ),
      # 7. Two expands (one end), one define.
      ('a\n//%PDDM-EXPAND foo(1)\nbody\n//%PDDM-EXPAND foo(2)\nbody2\n//%PDDM-EXPAND-END\n'
       '//%PDDM-DEFINE foo()\n//%body2\n',
       (1, 2, 2) ),
    ]
    for idx, (input_str, line_counts) in enumerate(test_list, 1):
      f = io.StringIO(input_str)
      sf = pddm.SourceFile(f)
      sf._ParseFile()
      self.assertEqual(len(sf._sections), len(line_counts),
                       'Entry %d -- %d != %d' %
                       (idx, len(sf._sections), len(line_counts)))
      for idx2, (sec, expected) in enumerate(zip(sf._sections, line_counts), 1):
        self.assertEqual(sec.num_lines_captured, expected,
                         'Entry %d, section %d -- %d != %d' %
                         (idx, idx2, sec.num_lines_captured, expected))

  def testErrors(self):
    test_list = [
      # 1. Directive within expansion
      ('//%PDDM-EXPAND a()\n//%PDDM-BOGUS',
       'Ran into directive ("//%PDDM-BOGUS", line 2) while in "//%PDDM-EXPAND a()".'),
      ('//%PDDM-EXPAND a()\n//%PDDM-DEFINE a()\n//%body\n',
       'Ran into directive ("//%PDDM-DEFINE", line 2) while in "//%PDDM-EXPAND a()".'),
      # 3. Expansion ran off end of file
      ('//%PDDM-EXPAND a()\na\nb\n',
       'Hit the end of the file while in "//%PDDM-EXPAND a()".'),
      # 4. Directive within define
      ('//%PDDM-DEFINE a()\n//%body\n//%PDDM-BOGUS',
       'Ran into directive ("//%PDDM-BOGUS", line 3) while in "//%PDDM-DEFINE a()".'),
      ('//%PDDM-DEFINE a()\n//%body\n//%PDDM-EXPAND-END a()',
       'Ran into directive ("//%PDDM-EXPAND-END", line 3) while in "//%PDDM-DEFINE a()".'),
      # 6. Directives that shouldn't start sections
      ('a\n//%PDDM-DEFINE-END a()\n//a\n',
       'Unexpected line 2: "//%PDDM-DEFINE-END a()".'),
      ('a\n//%PDDM-EXPAND-END a()\n//a\n',
       'Unexpected line 2: "//%PDDM-EXPAND-END a()".'),
      ('//%PDDM-BOGUS\n//a\n',
       'Unexpected line 1: "//%PDDM-BOGUS".'),
    ]
    for idx, (input_str, expected_err) in enumerate(test_list, 1):
      f = io.StringIO(input_str)
      try:
        pddm.SourceFile(f)._ParseFile()
        self.fail('Should throw exception, entry %d' % idx)
      except pddm.PDDMError as e:
        self.assertEqual(e.message, expected_err,
                        'Entry %d failed: %r' % (idx, e))

class TestProcessingSource(unittest.TestCase):

  def testBasics(self):
    self.maxDiff = None
    input_str = """
//%PDDM-IMPORT-DEFINES ImportFile
foo
//%PDDM-EXPAND mumble(abc)
//%PDDM-EXPAND-END
bar
//%PDDM-EXPAND mumble(def)
//%PDDM-EXPAND mumble(ghi)
//%PDDM-EXPAND-END
baz
//%PDDM-DEFINE mumble(a_)
//%a_: getName(a_)
"""
    input_str2 = """
//%PDDM-DEFINE getName(x_)
//%do##x_$u##(int x_);

"""
    expected = """
//%PDDM-IMPORT-DEFINES ImportFile
foo
//%PDDM-EXPAND mumble(abc)
// This block of code is generated, do not edit it directly.

abc: doAbc(int abc);
//%PDDM-EXPAND-END mumble(abc)
bar
//%PDDM-EXPAND mumble(def)
// This block of code is generated, do not edit it directly.

def: doDef(int def);
//%PDDM-EXPAND mumble(ghi)
// This block of code is generated, do not edit it directly.

ghi: doGhi(int ghi);
//%PDDM-EXPAND-END (2 expansions)
baz
//%PDDM-DEFINE mumble(a_)
//%a_: getName(a_)
"""
    expected_stripped = """
//%PDDM-IMPORT-DEFINES ImportFile
foo
//%PDDM-EXPAND mumble(abc)
//%PDDM-EXPAND-END mumble(abc)
bar
//%PDDM-EXPAND mumble(def)
//%PDDM-EXPAND mumble(ghi)
//%PDDM-EXPAND-END (2 expansions)
baz
//%PDDM-DEFINE mumble(a_)
//%a_: getName(a_)
"""
    def _Resolver(name):
      self.assertEqual(name, 'ImportFile')
      return io.StringIO(input_str2)
    f = io.StringIO(input_str)
    sf = pddm.SourceFile(f, _Resolver)
    sf.ProcessContent()
    self.assertEqual(sf.processed_content, expected)
    # Feed it through and nothing should change.
    f2 = io.StringIO(sf.processed_content)
    sf2 = pddm.SourceFile(f2, _Resolver)
    sf2.ProcessContent()
    self.assertEqual(sf2.processed_content, expected)
    self.assertEqual(sf2.processed_content, sf.processed_content)
    # Test stripping (with the original input and expanded version).
    f2 = io.StringIO(input_str)
    sf2 = pddm.SourceFile(f2)
    sf2.ProcessContent(strip_expansion=True)
    self.assertEqual(sf2.processed_content, expected_stripped)
    f2 = io.StringIO(sf.processed_content)
    sf2 = pddm.SourceFile(f2, _Resolver)
    sf2.ProcessContent(strip_expansion=True)
    self.assertEqual(sf2.processed_content, expected_stripped)

  def testProcessFileWithMacroParseError(self):
    input_str = """
foo
//%PDDM-DEFINE mumble(a_)
//%body
//%PDDM-DEFINE mumble(x_)
//%body2

"""
    f = io.StringIO(input_str)
    sf = pddm.SourceFile(f)
    try:
      sf.ProcessContent()
      self.fail('Should throw exception! Test failed to catch macro parsing error.')
    except pddm.PDDMError as e:
      self.assertEqual(e.message,
                       'Attempt to redefine macro: "PDDM-DEFINE mumble(x_)"\n'
                       '...while parsing section that started:\n'
                       '  Line 3: //%PDDM-DEFINE mumble(a_)')

  def testProcessFileWithExpandError(self):
    input_str = """
foo
//%PDDM-DEFINE mumble(a_)
//%body
//%PDDM-EXPAND foobar(x_)
//%PDDM-EXPAND-END

"""
    f = io.StringIO(input_str)
    sf = pddm.SourceFile(f)
    try:
      sf.ProcessContent()
      self.fail('Should throw exception! Test failed to catch expand error.')
    except pddm.PDDMError as e:
      self.assertEqual(e.message,
                       'No macro named "foobar".\n'
                       '...while expanding "foobar(x_)" from the section that'
                       ' started:\n   Line 5: //%PDDM-EXPAND foobar(x_)')


if __name__ == '__main__':
  unittest.main()