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# Copyright 2013 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# =*= License: GPL-3+ =*=
import cliapp
import yarnlib
class BlockError(cliapp.AppException):
pass
# Parse a sequence of textual blocks into scenario and Implementation
# objects, and their constituent objects.
class BlockParser(object):
def __init__(self):
self.scenarios = []
self.implementations = []
self.line_parsers = {
'SCENARIO': self.parse_scenario,
'ASSUMING': self.parse_assuming,
'GIVEN': self.parse_given,
'WHEN': self.parse_when,
'THEN': self.parse_then,
'FINALLY': self.parse_finally,
'AND': self.parse_and,
'...': self.parse_continuation,
'IMPLEMENTS': self.parse_implementing,
'EXAMPLE': self.parse_example,
}
def parse_blocks(self, blocks):
while blocks:
blocks = self.parse_one(blocks)
def parse_one(self, blocks):
assert blocks
block = blocks[0]
assert block
t = block.split('\n', 1)
assert len(t) in [1,2]
if len(t) == 1:
line1 = block
block = ''
else:
line1, block = t
if block:
blocks[0] = block
else:
del blocks[0]
words = line1.split()
if not words:
return blocks
rest = ' '.join(words[1:])
for keyword in self.line_parsers:
if words[0] == keyword:
return self.line_parsers[keyword](rest, blocks)
raise BlockError("Syntax error: unknown step: %s" % line1)
def parse_scenario(self, line, blocks):
self.scenarios.append(yarnlib.Scenario(line))
return blocks
def parse_simple(self, what, line, blocks):
if not self.scenarios:
raise BlockError('Syntax errror: %s before SCENARIO' % what)
step = yarnlib.ScenarioStep(what, line)
self.scenarios[-1].steps.append(step)
return blocks
def parse_assuming(self, line, blocks):
return self.parse_simple('ASSUMING', line, blocks)
def parse_given(self, line, blocks):
return self.parse_simple('GIVEN', line, blocks)
def parse_when(self, line, blocks):
return self.parse_simple('WHEN', line, blocks)
def parse_then(self, line, blocks):
return self.parse_simple('THEN', line, blocks)
def parse_finally(self, line, blocks):
return self.parse_simple('FINALLY', line, blocks)
def parse_and(self, line, blocks):
if not self.scenarios:
raise BlockError('Syntax errror: AND before SCENARIO')
scenario = self.scenarios[-1]
if not scenario.steps:
raise BlockError(
'Syntax errror: AND before what it would continue')
step = scenario.steps[-1]
assert step.what in self.line_parsers
return self.line_parsers[step.what](line, blocks)
def parse_continuation(self, line, blocks):
scenario = self.scenarios[-1]
step = scenario.steps[-1]
text = '%s %s' % (step.text, line)
del scenario.steps[-1]
return self.line_parsers[step.what](text, blocks)
def parse_implementing(self, line, blocks):
words = line.split()
if len(words) < 2:
raise BlockError(
'Syntax error: IMPLEMENTS must have what and regexp')
what = words[0]
regexp = ' '.join(words[1:])
if blocks:
block = blocks[0]
shell = []
rest = []
for block_line in block.splitlines():
if rest or block_line.startswith('IMPLEMENTS'):
rest.append(block_line)
else:
shell.append(block_line)
shell = '\n'.join(shell)
if rest:
blocks[0] = '\n'.join(rest)
else:
del blocks[0]
else:
shell = ''
implementation = yarnlib.Implementation(what, regexp, shell)
self.implementations.append(implementation)
return blocks
def parse_example(self, line, blocks):
if blocks:
del blocks[0]
return blocks
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