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# (C) Copyright David Abrahams 2001. Permission to copy, use, modify, sell and
# distribute this software is granted provided this copyright notice appears in
# all copies. This software is provided "as is" without express or implied
# warranty, and with no claim as to its suitability for any purpose.
""" Utility functions to add/remove/get grists.
Grists are string enclosed in angle brackets (<>) that are used as prefixes. See Jam for more information.
"""
import re
import os
import bjam
from b2.exceptions import *
__re_grist_and_value = re.compile (r'(<[^>]*>)(.*)')
__re_grist_content = re.compile ('^<(.*)>$')
__re_backslash = re.compile (r'\\')
def to_seq (value):
""" If value is a sequence, returns it.
If it is a string, returns a sequence with value as its sole element.
"""
if not value:
return []
if isinstance (value, str):
return [value]
else:
return value
def replace_references_by_objects (manager, refs):
objs = []
for r in refs:
objs.append (manager.get_object (r))
return objs
def add_grist (features):
""" Transform a string by bracketing it with "<>". If already bracketed, does nothing.
features: one string or a sequence of strings
return: the gristed string, if features is a string, or a sequence of gristed strings, if features is a sequence
"""
def grist_one (feature):
if feature [0] != '<' and feature [len (feature) - 1] != '>':
return '<' + feature + '>'
else:
return feature
if isinstance (features, str):
return grist_one (features)
else:
return [ grist_one (feature) for feature in features ]
def replace_grist (features, new_grist):
""" Replaces the grist of a string by a new one.
Returns the string with the new grist.
"""
def replace_grist_one (name, new_grist):
split = __re_grist_and_value.match (name)
if not split:
return new_grist + name
else:
return new_grist + split.group (2)
if isinstance (features, str):
return replace_grist_one (features, new_grist)
else:
return [ replace_grist_one (feature, new_grist) for feature in features ]
def get_value (property):
""" Gets the value of a property, that is, the part following the grist, if any.
"""
return replace_grist (property, '')
def get_grist (value):
""" Returns the grist of a string.
If value is a sequence, does it for every value and returns the result as a sequence.
"""
def get_grist_one (name):
split = __re_grist_and_value.match (name)
if not split:
return ''
else:
return split.group (1)
if isinstance (value, str):
return get_grist_one (value)
else:
return [ get_grist_one (v) for v in value ]
def ungrist (value):
""" Returns the value without grist.
If value is a sequence, does it for every value and returns the result as a sequence.
"""
def ungrist_one (value):
stripped = __re_grist_content.match (value)
if not stripped:
raise BaseException ("in ungrist: '%s' is not of the form <.*>" % value)
return stripped.group (1)
if isinstance (value, str):
return ungrist_one (value)
else:
return [ ungrist_one (v) for v in value ]
def replace_suffix (name, new_suffix):
""" Replaces the suffix of name by new_suffix.
If no suffix exists, the new one is added.
"""
split = os.path.splitext (name)
return split [0] + new_suffix
def forward_slashes (s):
""" Converts all backslashes to forward slashes.
"""
return __re_backslash.sub ('/', s)
def split_action_id (id):
""" Splits an id in the toolset and specific rule parts. E.g.
'gcc.compile.c++' returns ('gcc', 'compile.c++')
"""
split = id.split ('.', 1)
toolset = split [0]
name = ''
if len (split) > 1:
name = split [1]
return (toolset, name)
def os_name ():
result = bjam.variable("OS")
assert(len(result) == 1)
return result[0]
def platform ():
return bjam.variable("OSPLAT")
def os_version ():
return bjam.variable("OSVER")
def on_windows ():
""" Returns true if running on windows, whether in cygwin or not.
"""
if bjam.variable("NT"):
return True
elif bjam.variable("UNIX"):
uname = bjam.variable("JAMUNAME")
if uname and uname[0].startswith("CYGWIN"):
return True
return False
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