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matplotlib/lib/matplotlib/fontconfig_pattern.py at master · gitj/matplotlib · GitHub
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matplotlib
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fontconfig_pattern.py
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lib
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matplotlib
/
fontconfig_pattern.py
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"""
A module for parsing and generating fontconfig patterns.
See the `fontconfig pattern specification
<http://www.fontconfig.org/fontconfig-user.html>`_ for more
information.
"""
# Author : Michael Droettboom <mdroe@stsci.edu>
# License : matplotlib license (PSF compatible)
# This class is defined here because it must be available in:
# - The old-style config framework (:file:`rcsetup.py`)
# - The traits-based config framework (:file:`mpltraits.py`)
# - The font manager (:file:`font_manager.py`)
# It probably logically belongs in :file:`font_manager.py`, but
# placing it in any of these places would have created cyclical
# dependency problems, or an undesired dependency on traits even
# when the traits-based config framework is not used.
from
__future__
import
print_function
import
re
,
sys
if
sys
.
version_info
[
0
]
>=
3
:
from
matplotlib
.
pyparsing_py3
import
Literal
,
ZeroOrMore
, \
Optional
,
Regex
,
StringEnd
,
ParseException
,
Suppress
else
:
from
matplotlib
.
pyparsing_py2
import
Literal
,
ZeroOrMore
, \
Optional
,
Regex
,
StringEnd
,
ParseException
,
Suppress
family_punc
=
r'\\\-:,'
family_unescape
=
re
.
compile
(
r'\\([%s])'
%
family_punc
).
sub
family_escape
=
re
.
compile
(
r'([%s])'
%
family_punc
).
sub
value_punc
=
r'\\=_:,'
value_unescape
=
re
.
compile
(
r'\\([%s])'
%
value_punc
).
sub
value_escape
=
re
.
compile
(
r'([%s])'
%
value_punc
).
sub
class
FontconfigPatternParser
:
"""A simple pyparsing-based parser for fontconfig-style patterns.
See the `fontconfig pattern specification
<http://www.fontconfig.org/fontconfig-user.html>`_ for more
information.
"""
_constants
=
{
'thin'
: (
'weight'
,
'light'
),
'extralight'
: (
'weight'
,
'light'
),
'ultralight'
: (
'weight'
,
'light'
),
'light'
: (
'weight'
,
'light'
),
'book'
: (
'weight'
,
'book'
),
'regular'
: (
'weight'
,
'regular'
),
'normal'
: (
'weight'
,
'normal'
),
'medium'
: (
'weight'
,
'medium'
),
'demibold'
: (
'weight'
,
'demibold'
),
'semibold'
: (
'weight'
,
'semibold'
),
'bold'
: (
'weight'
,
'bold'
),
'extrabold'
: (
'weight'
,
'extra bold'
),
'black'
: (
'weight'
,
'black'
),
'heavy'
: (
'weight'
,
'heavy'
),
'roman'
: (
'slant'
,
'normal'
),
'italic'
: (
'slant'
,
'italic'
),
'oblique'
: (
'slant'
,
'oblique'
),
'ultracondensed'
: (
'width'
,
'ultra-condensed'
),
'extracondensed'
: (
'width'
,
'extra-condensed'
),
'condensed'
: (
'width'
,
'condensed'
),
'semicondensed'
: (
'width'
,
'semi-condensed'
),
'expanded'
: (
'width'
,
'expanded'
),
'extraexpanded'
: (
'width'
,
'extra-expanded'
),
'ultraexpanded'
: (
'width'
,
'ultra-expanded'
)
}
def
__init__
(
self
):
family
=
Regex
(
r'([^%s]|(\\[%s]))*'
%
(
family_punc
,
family_punc
)) \
.
setParseAction
(
self
.
_family
)
size
=
Regex
(
r"([0-9]+\.?[0-9]*|\.[0-9]+)"
) \
.
setParseAction
(
self
.
_size
)
name
=
Regex
(
r'[a-z]+'
) \
.
setParseAction
(
self
.
_name
)
value
=
Regex
(
r'([^%s]|(\\[%s]))*'
%
(
value_punc
,
value_punc
)) \
.
setParseAction
(
self
.
_value
)
families
=
(
family
+
ZeroOrMore
(
Literal
(
','
)
+
family
)
).
setParseAction
(
self
.
_families
)
point_sizes
=
(
size
+
ZeroOrMore
(
Literal
(
','
)
+
size
)
).
setParseAction
(
self
.
_point_sizes
)
property
=
( (
name
+
Suppress
(
Literal
(
'='
))
+
value
+
ZeroOrMore
(
Suppress
(
Literal
(
','
))
+
value
)
)
|
name
).
setParseAction
(
self
.
_property
)
pattern
=
(
Optional
(
families
)
+
Optional
(
Literal
(
'-'
)
+
point_sizes
)
+
ZeroOrMore
(
Literal
(
':'
)
+
property
)
+
StringEnd
()
)
self
.
_parser
=
pattern
self
.
ParseException
=
ParseException
def
parse
(
self
,
pattern
):
"""
Parse the given fontconfig *pattern* and return a dictionary
of key/value pairs useful for initializing a
:class:`font_manager.FontProperties` object.
"""
props
=
self
.
_properties
=
{}
try
:
self
.
_parser
.
parseString
(
pattern
)
except
self
.
ParseException
as
e
:
raise
ValueError
(
"Could not parse font string: '%s'
\n
%s"
%
(
pattern
,
e
))
self
.
_properties
=
None
self
.
_parser
.
resetCache
()
return
props
def
_family
(
self
,
s
,
loc
,
tokens
):
return
[
family_unescape
(
r'\1'
,
str
(
tokens
[
0
]))]
def
_size
(
self
,
s
,
loc
,
tokens
):
return
[
float
(
tokens
[
0
])]
def
_name
(
self
,
s
,
loc
,
tokens
):
return
[
str
(
tokens
[
0
])]
def
_value
(
self
,
s
,
loc
,
tokens
):
return
[
value_unescape
(
r'\1'
,
str
(
tokens
[
0
]))]
def
_families
(
self
,
s
,
loc
,
tokens
):
self
.
_properties
[
'family'
]
=
[
str
(
x
)
for
x
in
tokens
]
return
[]
def
_point_sizes
(
self
,
s
,
loc
,
tokens
):
self
.
_properties
[
'size'
]
=
[
str
(
x
)
for
x
in
tokens
]
return
[]
def
_property
(
self
,
s
,
loc
,
tokens
):
if
len
(
tokens
)
==
1
:
if
tokens
[
0
]
in
self
.
_constants
:
key
,
val
=
self
.
_constants
[
tokens
[
0
]]
self
.
_properties
.
setdefault
(
key
, []).
append
(
val
)
else
:
key
=
tokens
[
0
]
val
=
tokens
[
1
:]
self
.
_properties
.
setdefault
(
key
, []).
extend
(
val
)
return
[]
parse_fontconfig_pattern
=
FontconfigPatternParser
().
parse
def
generate_fontconfig_pattern
(
d
):
"""
Given a dictionary of key/value pairs, generates a fontconfig
pattern string.
"""
props
=
[]
families
=
''
size
=
''
for
key
in
'family style variant weight stretch file size'
.
split
():
val
=
getattr
(
d
,
'get_'
+
key
)()
if
val
is
not
None
and
val
!=
[]:
if
type
(
val
)
==
list
:
val
=
[
value_escape
(
r'\\\1'
,
str
(
x
))
for
x
in
val
if
x
is
not
None
]
if
val
!=
[]:
val
=
','
.
join
(
val
)
props
.
append
(
":%s=%s"
%
(
key
,
val
))
return
''
.
join
(
props
)
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