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import os
import re
import sys
import textwrap
import pycparser.c_generator
def parse_constant(node):
if isinstance(node, pycparser.c_ast.Constant):
return node.value
elif isinstance(node, pycparser.c_ast.UnaryOp) and node.op == '-':
return '-' + parse_constant(node.expr)
else:
raise TypeError(node)
class PrintEnumsVisitor(pycparser.c_ast.NodeVisitor):
def visit_Decl(self, node): # noqa: N802
if node.name and node.name.startswith('CAIRO_'): # len('CAIRO_') == 6
if node.init.type == 'string':
print('%s = b%s' % (node.name[6:], node.init.value))
else:
print('%s = %s' % (node.name[6:], node.init.value))
print('')
def visit_Enum(self, node): # noqa: N802
value = 0
for enumerator in node.values.enumerators:
if enumerator.value is not None:
value_string = parse_constant(enumerator.value)
value = int(value_string, 0)
else:
value_string = str(value)
assert enumerator.name.startswith('CAIRO_') # len('CAIRO_') == 6
print('%s = %s' % (enumerator.name[6:], value_string))
value += 1
print('')
def read_cairo_header(cairo_git_dir, suffix):
filename = os.path.join(cairo_git_dir, 'src', 'cairo%s.h' % suffix)
source = open(filename, encoding='iso-8859-1').read()
source = re.sub(
'/\\*.*?\\*/'
'|CAIRO_(BEGIN|END)_DECLS'
'|cairo_public '
r'|^\s*#.*?[^\\]\n',
'',
source,
flags=re.DOTALL | re.MULTILINE)
source = re.sub('\n{3,}', '\n\n', source)
return source
def generate(cairo_git_dir):
# Remove comments, preprocessor instructions and macros.
source = read_cairo_header(cairo_git_dir, '')
source += 'const int CAIRO_PDF_OUTLINE_ROOT = 0;\n'
source += read_cairo_header(cairo_git_dir, '-pdf')
source += read_cairo_header(cairo_git_dir, '-ps')
source += read_cairo_header(cairo_git_dir, '-svg')
source += '''
typedef void* HDC;
typedef void* HFONT;
typedef void LOGFONTW;
'''
source += read_cairo_header(cairo_git_dir, '-win32')
source += '''
typedef void* CGContextRef;
typedef void* CGFontRef;
typedef void* ATSUFontID;
'''
source += read_cairo_header(cairo_git_dir, '-quartz')
ast = pycparser.CParser().parse(source)
print(textwrap.dedent('''\
# *** Do not edit this file ***
# Generated by utils/mkconstants.py
# flake8: noqa
TAG_DEST = b"cairo.dest"
TAG_LINK = b"Link"\n'''))
PrintEnumsVisitor().visit(ast)
print('_CAIRO_HEADERS = r"""%s"""' % source)
source = read_cairo_header(cairo_git_dir, '-xcb')
print('_CAIRO_XCB_HEADERS = r"""%s"""' % source)
if __name__ == '__main__':
if len(sys.argv) >= 2:
generate(sys.argv[1])
else:
print('Usage: %s path/to/cairo_source.git' % sys.argv[0])
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