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# coding=utf-8
#
# Copyright © 2011 Intel Corporation
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice (including the next
# paragraph) shall be included in all copies or substantial portions of the
# Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
# This file contains helper functions for manipulating sexps in Python.
#
# We represent a sexp in Python using nested lists containing strings.
# So, for example, the sexp (constant float (1.000000)) is represented
# as ['constant', 'float', ['1.000000']].
import re
import sys
if sys.version_info >= (3, 0, 0):
STRING_TYPE = str
else:
STRING_TYPE = unicode
def check_sexp(sexp):
"""Verify that the argument is a proper sexp.
That is, raise an exception if the argument is not a string or a
list, or if it contains anything that is not a string or a list at
any nesting level.
"""
if isinstance(sexp, list):
for s in sexp:
check_sexp(s)
elif not isinstance(sexp, (STRING_TYPE, bytes)):
raise Exception('Not a sexp: {0!r}'.format(sexp))
def parse_sexp(sexp):
"""Convert a string, of the form that would be output by mesa,
into a sexp represented as nested lists containing strings.
"""
sexp_token_regexp = re.compile(
'[a-zA-Z_]+(@[0-9]+)?|[0-9]+(\\.[0-9]+)?|[^ \n]')
stack = [[]]
for match in sexp_token_regexp.finditer(sexp):
token = match.group(0)
if token == '(':
stack.append([])
elif token == ')':
if len(stack) == 1:
raise Exception('Unmatched )')
sexp = stack.pop()
stack[-1].append(sexp)
else:
stack[-1].append(token)
if len(stack) != 1:
raise Exception('Unmatched (')
if len(stack[0]) != 1:
raise Exception('Multiple sexps')
return stack[0][0]
def sexp_to_string(sexp):
"""Convert a sexp, represented as nested lists containing strings,
into a single string of the form parseable by mesa.
"""
if isinstance(sexp, STRING_TYPE):
return sexp
if isinstance(sexp, bytes):
return sexp.encode('utf-8')
assert isinstance(sexp, list)
result = ''
for s in sexp:
sub_result = sexp_to_string(s)
if result == '':
result = sub_result
elif '\n' not in result and '\n' not in sub_result and \
len(result) + len(sub_result) + 1 <= 70:
result += ' ' + sub_result
else:
result += '\n' + sub_result
return '({0})'.format(result.replace('\n', '\n '))
def sort_decls(sexp):
"""Sort all toplevel variable declarations in sexp.
This is used to work around the fact that
ir_reader::read_instructions reorders declarations.
"""
assert isinstance(sexp, list)
decls = []
other_code = []
for s in sexp:
if isinstance(s, list) and len(s) >= 4 and s[0] == 'declare':
decls.append(s)
else:
other_code.append(s)
return sorted(decls) + other_code
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