# Copyright (c) 2017 Science and Technology Facilities Council

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"""
Test the various utility functions

"""

import pytest
from fparser.utils import split_comma, ParseError


def test_split_comma():
    ''' Test the split_comma() function '''
    items = split_comma("hello, goodbye")
    print items
    assert items[0] == "hello"
    assert items[1] == "goodbye"
    # With trailing and leading white space
    items = split_comma("  hello, goodbye   ")
    print items
    assert items[0] == "hello"
    assert items[1] == "goodbye"
    items = split_comma("  ")
    assert not items


def test_split_comma_exceptions():
    ''' Test that we raise the expected exceptions if we don't supply
    the brackets in the right form '''
    with pytest.raises(ParseError) as excinfo:
        _ = split_comma("one, two", brackets="()")
    assert "brackets must be a tuple" in str(excinfo)
    with pytest.raises(ParseError) as excinfo:
        _ = split_comma("one, two", brackets=("()", ))
    assert "brackets tuple must contain just two items" in str(excinfo)
    with pytest.raises(ParseError) as excinfo:
        _ = split_comma("one, two", brackets=("(", "(", "("))
    assert "brackets tuple must contain just two items" in str(excinfo)


def test_split_bracketed_list():
    ''' Test the splitting of a list bracketed with parentheses '''
    items = split_comma("(well(1), this(is), it)", brackets=("(", ")"))
    print items
    assert items[0] == "well(1)"
    assert items[1] == "this(is)"
    # With superfluous white space
    items = split_comma("  (  well(1), this(is), it  )  ",
                        brackets=("(", ")"))
    print items
    assert items[0] == "well(1)"
    assert items[1] == "this(is)"
    assert items[2] == "it"
    # Square brackets
    items = split_comma("[well(1), this(is), it]", brackets=("[", "]"))
    print items
    assert items[0] == "well(1)"
    assert items[1] == "this(is)"
    assert items[2] == "it"
    # Mis-matched brackets
    items = split_comma("[well(1), this(is), it)", brackets=("[", "]"))
    assert not items


def test_extract_bracketed_list():
    ''' Test the extraction and parsing of a list within parentheses within
    a larger string '''
    from fparser.utils import extract_bracketed_list_items
    items = extract_bracketed_list_items("hello (this, is, a) test")
    assert items[0] == "this"
    assert items[1] == "is"
    assert items[2] == "a"


def test_extract_bracketed_list_err():
    ''' Test that we get the expected errors if the string passed into
    extract_bracketed_list_items() does not have the correct format '''
    from fparser.utils import extract_bracketed_list_items
    with pytest.raises(ParseError) as excinfo:
        _ = extract_bracketed_list_items("hello (this, is, wrong(")
    assert "more than one opening/closing parenthesis found" in str(excinfo)
    with pytest.raises(ParseError) as excinfo:
        _ = extract_bracketed_list_items("hello )this, is, wrong)")
    assert "more than one opening/closing parenthesis found" in str(excinfo)
    with pytest.raises(ParseError) as excinfo:
        _ = extract_bracketed_list_items("hello (this, is, wrong) (too)")
    assert "more than one opening/closing parenthesis found" in str(excinfo)
    with pytest.raises(ParseError) as excinfo:
        _ = extract_bracketed_list_items("hello )this, is, wrong( too")
    assert "failed to find expression within parentheses in" in str(excinfo)
