#!/usr/bin/python3

"""test_testing.py - tests of the testing-module of DHParser

Author: Eckhart Arnold <arnold@badw.de>

Copyright 2017 Bavarian Academy of Sciences and Humanities

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""

import os
import re
import sys
from functools import partial

sys.path.extend(['../', './'])

from DHParser.syntaxtree import mock_syntax_tree, flatten_sxpr, TOKEN_PTYPE
from DHParser.transform import traverse, remove_expendables, \
    replace_by_single_child, content_from_sinlge_child, flatten
from DHParser.dsl import grammar_provider
from DHParser.testing import grammar_unit

ARITHMETIC_EBNF = """
    @ whitespace = linefeed
    formula = [ //~ ] expr
    expr = expr ("+"|"-") term | term
    term = term ("*"|"/") factor | factor
    factor = /[0-9]+/~
    # example:  "5 + 3 * 4"
    """


ARITHMETIC_EBNF_transformation_table = {
    # AST Transformations for the DSL-grammar
    "formula": [remove_expendables],
    "term, expr": [replace_by_single_child, flatten],
    "factor": [remove_expendables, content_from_sinlge_child],
    (TOKEN_PTYPE): [remove_expendables, content_from_sinlge_child],
    "*": [remove_expendables, replace_by_single_child]
}


ARITHMETIC_EBNFTransform = partial(traverse, processing_table=ARITHMETIC_EBNF_transformation_table)


class TestGrammarTest:
    cases = {
        "factor": {
            "match": {
                1: "0",
                2: "314",
            },
            "fail": {
                3: "21F",
                4: "G123"
            }
        },
        "term": {
            "match": {
                1: "4 * 5",
                2: "20 / 4",
                3: "20 / 4 * 3"
            },
            "ast": {
                1: "(term (factor 4) (:Token *) (factor 5))",
                2: "(term (factor 20) (:Token /) (factor 4))",
                3: "(term (term (factor 20) (:Token /) (factor 4)) (:Token *) (factor 3))"
            },
            "fail": {
                4: "4 + 5",
                5: "20 / 4 - 3"
            }
        }
    }

    failure_cases = {
        "term": {
            "match": {
                1: "4 + 5",     # error: this should fail
                2: "20 / 4",
                3: "20 / 4 * 3"
            },
            "ast": {
                1: "(term (factor 4) (:Token *) (factor 5))",
                2: "(term (factor 20) (:Token /) (factor 4))",
                3: "(term (term (factor 19) (:Token /) (factor 4)) (:Token *) (factor 3))"  # error 19 != 20
            },
            "fail": {
                4: "4 * 5",     # error: this should match
                5: "20 / 4 - 3"
            }
        }
    }

    def teardown(self):
        if os.path.exists('REPORT'):
            files = os.listdir('REPORT')
            flag = False
            for file in files:
                if re.match(r'\d+\.md', file):
                    os.remove(os.path.join('REPORT', file))
                else:
                    flag = True
            if not flag:
                os.rmdir('REPORT')

    def test_testing_grammar(self):
        parser_fac = grammar_provider(ARITHMETIC_EBNF)
        trans_fac = lambda : ARITHMETIC_EBNFTransform
        errata = grammar_unit(self.cases, parser_fac, trans_fac)
        assert not errata, str(errata)
        errata = grammar_unit(self.failure_cases, parser_fac, trans_fac)
        # for e in errata:
        #     print(e)
        assert len(errata) == 3


class TestSExpr:
    """
    Tests for S-expression handling.
    """
    def test_compact_sexpr(self):
        assert flatten_sxpr("(a\n    (b\n        c\n    )\n)\n") == "(a (b c))"

    def test_mock_syntax_tree(self):
        sexpr = '(a (b c) (d e) (f (g h)))'
        tree = mock_syntax_tree(sexpr)
        assert flatten_sxpr(tree.as_sxpr().replace('"', '')) == sexpr

        # test different quotation marks
        sexpr = '''(a (b """c""" 'k' "l") (d e) (f (g h)))'''
        sexpr_stripped = '(a (b c k l) (d e) (f (g h)))'
        tree = mock_syntax_tree(sexpr)
        assert flatten_sxpr(tree.as_sxpr().replace('"', '')) == sexpr_stripped

        sexpr_clean = '(a (b "c" "k" "l") (d "e") (f (g "h")))'
        tree = mock_syntax_tree(sexpr_clean)
        assert flatten_sxpr(tree.as_sxpr()) == sexpr_clean

        tree = mock_syntax_tree(sexpr_stripped)
        assert flatten_sxpr(tree.as_sxpr()) == '(a (b "c k l") (d "e") (f (g "h")))'

    def test_mock_syntax_tree_with_classes(self):
        sexpr = '(a:class1 (b:class2 x) (:class3 y) (c z))'
        tree = mock_syntax_tree(sexpr)
        assert tree.tag_name == 'a'
        assert tree.result[0].tag_name == 'b'
        assert tree.result[1].tag_name == ':class3'
        assert tree.result[2].tag_name == 'c'


if __name__ == "__main__":
    from DHParser.testing import runner
    runner("", globals())