0,0 → 1,103 |
# 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 |
|
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, basestring): |
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, basestring): |
return sexp |
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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