4-feat-build-srcplccscannermatcherpy

[TheDragonApple]

No description provided.

[StoneyJackson]

Thought I'd give you a couple pointers.

[StoneyJackson]

We probably don't want to depend on parse_lexical_spec. The input we'll be given is pre-parsed and pre-validated, and is JSON. When JSON is loaded in Python using json.load or json.loads it will become a nested structure of dict, list, str, int, bool, etc. So from the perspective of the Matcher, a lexical spec looks like...

spec = [
    {
        "type": "Token",
        "name": "MINUS",
        "regex": "-"
    }
]
spec[0]['name'] == 'MINUS'

There may be other fields, like Line, but I don't think you'll need them. If you do, great.

[StoneyJackson]

match() should take a Line and an index and return one of three kinds of objects: LexError, Token, and Skip.

A test would then look something like...

def test_empty_line():
    matcher = make_matcher()
    line = Line(text="", file=None, number=1)
    result = test_matcher.match(line=line, index=0)
    assert result == LexError(line=line, column=1)

[StoneyJackson]

def test_non_empty_line():
    matcher = make_matcher()
    line = Line(text="-", file=None, number=1)
    result = test_matcher.match(line=line, index=0)
    assert result == Token(name="MINUS", lexeme="-", line=line, column=1)