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import unittest
from examples.jsonParser import jsonObject
from examples.simpleBool import boolExpr
from examples.simpleSQL import simpleSQL
from examples.mozillaCalendarParser import calendars
from pyparsing.diagram import to_railroad, railroad_to_html
from pyparsing import Or
import tempfile
import os
class TestRailroadDiagrams(unittest.TestCase):
def railroad_debug(self) -> bool:
"""
Returns True if we're in debug mode
"""
return os.environ.get("RAILROAD_DEBUG", False)
def get_temp(self):
"""
Returns an appropriate temporary file for writing a railroad diagram
"""
return tempfile.NamedTemporaryFile(
delete=not self.railroad_debug(), mode="w", encoding="utf-8", suffix=".html"
)
def test_bool_expr(self):
with self.get_temp() as temp:
railroad = to_railroad(boolExpr)
assert len(railroad) == 3
temp.write(railroad_to_html(railroad))
if self.railroad_debug():
print("bool expr:" + temp.name)
def test_json(self):
with self.get_temp() as temp:
railroad = to_railroad(jsonObject)
assert len(railroad) == 4
temp.write(railroad_to_html(railroad))
if self.railroad_debug():
print("json: " + temp.name)
def test_sql(self):
with self.get_temp() as temp:
railroad = to_railroad(simpleSQL)
assert len(railroad) == 7
temp.write(railroad_to_html(railroad))
if self.railroad_debug():
print("sql: " + temp.name)
def test_calendars(self):
with self.get_temp() as temp:
railroad = to_railroad(calendars)
temp.write(railroad_to_html(railroad))
if self.railroad_debug():
print("calendar: " + temp.name)
def test_none_name(self):
grammar = Or(["foo", "bar"])
railroad = to_railroad(grammar)
assert len(railroad) == 1
assert railroad[0].name is not None
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