228 lines
8.9 KiB
Python
228 lines
8.9 KiB
Python
import pytest
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from core.sheerka.services.SheerkaExecute import ParserInput
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from core.tokenizer import Keywords, Tokenizer, TokenKind
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from parsers.BaseCustomGrammarParser import BaseCustomGrammarParser, SyntaxErrorNode, KeywordNotFound
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from parsers.BaseParser import UnexpectedEofNode, UnexpectedTokenErrorNode
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from tests.TestUsingMemoryBasedSheerka import TestUsingMemoryBasedSheerka
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class TestBaseCustomGrammarParser(TestUsingMemoryBasedSheerka):
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@staticmethod
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def compare_results(actual, expected, compare_str=False):
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resolved_expected = {}
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for k, v in expected.items():
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tokens = list(Tokenizer(v, yield_eof=False))
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resolved_expected[k] = [tokens[0]] + tokens[2:]
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def get_better_representation(value):
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better_repr = {}
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for k, tokens in value.items():
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value = "".join([t.str_value if compare_str else t.repr_value for t in tokens[1:]])
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better_repr[k] = [tokens[0].repr_value, value]
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return better_repr
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actual_to_compare = get_better_representation(actual)
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expected_to_compare = get_better_representation(resolved_expected)
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assert actual_to_compare == expected_to_compare
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def init_parser(self, text):
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sheerka, context = self.init_concepts()
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parser = BaseCustomGrammarParser("TestBaseCustomLanguageParser", 0)
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parser.reset_parser(context, ParserInput(text))
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parser.parser_input.next_token(False) # do not skip starting whitespaces
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return sheerka, context, parser
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@pytest.mark.parametrize("text, expected", [
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("when xxx yyy", {Keywords.WHEN: "when xxx yyy"}),
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("when uuu vvv print xxx yyy", {Keywords.WHEN: "when uuu vvv ", Keywords.PRINT: "print xxx yyy"}),
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("print xxx yyy when uuu vvv", {Keywords.WHEN: "when uuu vvv", Keywords.PRINT: "print xxx yyy "}),
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(" when xxx", {Keywords.WHEN: "when xxx"}),
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])
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def test_i_can_get_parts(self, text, expected):
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sheerka, context, parser = self.init_parser(text)
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res = parser.get_parts(["when", "print"])
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self.compare_results(res, expected)
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def test_i_can_get_parts_when_multilines(self):
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text = """when
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def func(x):
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return x+1
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func(a)
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"""
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expected = {Keywords.WHEN: "when def func(x):\n\treturn x+1\nfunc(a)\n"}
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sheerka, context, parser = self.init_parser(text)
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res = parser.get_parts(["when"])
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self.compare_results(res, expected)
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@pytest.mark.parametrize("text", [
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"",
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"no keyword",
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"anything before when xxx print yyy",
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])
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def test_i_cannot_get_parts_when_no_keyword_found(self, text):
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sheerka, context, parser = self.init_parser(text)
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assert parser.get_parts(["when", "print"]) is None
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assert len(parser.error_sink) == 1
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assert isinstance(parser.error_sink[0], KeywordNotFound)
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assert parser.error_sink[0].keywords == ['when', 'print']
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def test_i_cannot_get_part_when_the_first_expected_token_is_incorrect(self):
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sheerka, context, parser = self.init_parser("when xxx print yyy")
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assert parser.get_parts(["when", "print"], Keywords.PRINT) is None
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assert parser.error_sink == [UnexpectedTokenErrorNode(f"'print' keyword not found.",
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"when",
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[Keywords.PRINT])]
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def test_i_can_detect_when_a_keyword_appears_several_times(self):
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sheerka, context, parser = self.init_parser("print hello when True print True")
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parser.get_parts(["print"])
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assert len(parser.error_sink) == 1
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assert isinstance(parser.error_sink[0], SyntaxErrorNode)
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assert parser.error_sink[0].message == "Too many 'print' declarations."
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@pytest.mark.parametrize("text", [
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"print",
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"print ",
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"when xxx print",
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"when xxx print ",
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])
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def test_i_can_detect_incorrect_end_of_file_after_keyword(self, text):
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sheerka, context, parser = self.init_parser(text)
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assert parser.get_parts(["print", "when"]) is not None
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assert len(parser.error_sink) == 1
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assert isinstance(parser.error_sink[0], UnexpectedEofNode)
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assert parser.error_sink[0].message == "While parsing keyword 'print'."
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def test_i_can_double_quoted_strings_are_expanded(self):
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"""
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When inside a double quote, the double quote is removed and its content it used as is.
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It allows usage of keywords withing parts
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:return:
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"""
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sheerka, context, parser = self.init_parser('print "when can be used" when True')
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expected = {Keywords.PRINT: "print when can be used", Keywords.WHEN: "when True"}
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res = parser.get_parts(["print", "when"])
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self.compare_results(res, expected)
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def test_single_quoted_strings_are_not_expanded(self):
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sheerka, context, parser = self.init_parser("print 'when can be used' when True")
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expected = {Keywords.PRINT: "print 'when can be used' ", Keywords.WHEN: "when True"}
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res = parser.get_parts(["print", "when"])
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self.compare_results(res, expected)
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def test_i_can_manage_colon(self):
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text = """when:
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xxx
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when
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print
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print:
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xxx:
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when
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print
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yyy
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"""
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sheerka, context, parser = self.init_parser(text)
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expected = {Keywords.PRINT: "print xxx:\n when\n print\nyyy", Keywords.WHEN: "when xxx\nwhen\nprint"}
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res = parser.get_parts(["print", "when"])
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self.compare_results(res, expected, compare_str=True)
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def test_indentation_is_normalized_when_using_colon(self):
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text = """print:
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xxx:
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when
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print
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yyy
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"""
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sheerka, context, parser = self.init_parser(text)
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expected = {Keywords.PRINT: "print xxx:\n when\n print\nyyy"}
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res = parser.get_parts(["print", "when"])
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self.compare_results(res, expected, compare_str=True)
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def test_i_can_mix_parts_with_colon_and_parts_without_colon(self):
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text = """when:
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xxx
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when
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print
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print xxx"""
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sheerka, context, parser = self.init_parser(text)
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expected = {Keywords.PRINT: "print xxx", Keywords.WHEN: "when xxx\nwhen\nprint"}
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res = parser.get_parts(["print", "when"])
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self.compare_results(res, expected, compare_str=True)
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@pytest.mark.parametrize("text", [
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"when:\nx x",
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"when: \nx x",
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])
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def test_i_cannot_manage_colon_when_tab_is_missing(self, text):
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sheerka, context, parser = self.init_parser(text)
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assert parser.get_parts(["when"])
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assert parser.error_sink == [UnexpectedTokenErrorNode("Indentation not found.", "x", [TokenKind.WHITESPACE])]
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@pytest.mark.parametrize("text", [
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"",
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"\n",
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" \n",
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"x", # less than two characters
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"\n\t"
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])
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def test_i_cannot_get_body_when_body_is_too_short(self, text):
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sheerka, context, parser = self.init_parser("")
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assert parser.get_body(list(Tokenizer(text, yield_eof=False))) is None
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assert parser.error_sink == [SyntaxErrorNode(None, "Body is empty or too short.")]
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def test_a_new_line_is_expected_when_get_body(self):
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sheerka, context, parser = self.init_parser("")
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assert parser.get_body(list(Tokenizer("not a newline", yield_eof=False))) is None
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assert parser.error_sink == [UnexpectedTokenErrorNode("New line not found.", "not", [TokenKind.NEWLINE])]
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@pytest.mark.parametrize("text", [
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"\nx x",
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" \nx x",
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])
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def test_tab_is_mandatory_after_new_line_when_get_body(self, text):
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sheerka, context, parser = self.init_parser("")
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assert parser.get_body(list(Tokenizer(text, yield_eof=False))) is None
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assert parser.error_sink == [UnexpectedTokenErrorNode("Indentation not found.", "x", [TokenKind.WHITESPACE])]
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def test_i_can_detect_missing_tab_when_get_body(self):
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text = "\n\txxx\n\tyyy\nzzz"
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sheerka, context, parser = self.init_parser("")
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assert parser.get_body(list(Tokenizer(text, yield_eof=False))) is None
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assert parser.error_sink == [UnexpectedTokenErrorNode("Indentation not found.", "zzz", [TokenKind.WHITESPACE])]
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def test_i_can_detect_invalid_indentation_when_get_body(self):
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sheerka, context, parser = self.init_parser("")
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assert parser.get_body(list(Tokenizer("\n\t\txxx\n\tyyy", yield_eof=False))) is None
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assert parser.error_sink == [SyntaxErrorNode(None, "Invalid indentation.")]
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def test_i_can_get_body(self):
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sheerka, context, parser = self.init_parser("")
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res = parser.get_body(list(Tokenizer("\n\txxx\n\tyyyy", yield_eof=False)))
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expected = list(Tokenizer("xxx\n yyyy", yield_eof=False))
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expected[2].value = ""
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assert [t.repr_value for t in res] == [t.repr_value for t in expected]
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assert parser.error_sink == []
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