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#!/usr/bin/env python
import sys, os, os.path, re, codecs
BUILD_SOURCE_FILE = os.path.join("src", "lxml", "xmlerror.pxi")
BUILD_DEF_FILE = os.path.join("src", "lxml", "xmlerror.pxd")
if len(sys.argv) < 2 or sys.argv[1].lower() in ('-h', '--help'):
print("This script generates the constants in file %s" % BUILD_SOURCE_FILE)
print("Call as")
print(sys.argv[0], "/path/to/libxml2-doc-dir")
sys.exit(len(sys.argv) > 1)
HTML_DIR = os.path.join(sys.argv[1], 'html')
os.stat(HTML_DIR) # raise an error if we can't find it
sys.path.insert(0, 'src')
from lxml import etree
# map enum name to Python variable name and alignment for constant name
ENUM_MAP = {
'xmlErrorLevel' : ('__ERROR_LEVELS', 'XML_ERR_'),
'xmlErrorDomain' : ('__ERROR_DOMAINS', 'XML_FROM_'),
'xmlParserErrors' : ('__PARSER_ERROR_TYPES', 'XML_'),
# 'xmlXPathError' : ('__XPATH_ERROR_TYPES', ''),
# 'xmlSchemaValidError' : ('__XMLSCHEMA_ERROR_TYPES', 'XML_'),
'xmlRelaxNGValidErr' : ('__RELAXNG_ERROR_TYPES', 'XML_'),
}
ENUM_ORDER = (
'xmlErrorLevel',
'xmlErrorDomain',
'xmlParserErrors',
# 'xmlXPathError',
# 'xmlSchemaValidError',
'xmlRelaxNGValidErr')
COMMENT = """
# This section is generated by the script '%s'.
""" % os.path.basename(sys.argv[0])
def split(lines):
lines = iter(lines)
pre = []
for line in lines:
pre.append(line)
if line.startswith('#') and "BEGIN: GENERATED CONSTANTS" in line:
break
pre.append('')
for line in lines:
if line.startswith('#') and "END: GENERATED CONSTANTS" in line:
break
post = ['', line]
post.extend(lines)
post.append('')
return pre, post
def regenerate_file(filename, result):
# read .pxi source file
f = codecs.open(filename, 'r', encoding="utf-8")
pre, post = split(f)
f.close()
# write .pxi source file
f = codecs.open(filename, 'w', encoding="utf-8")
f.write(''.join(pre))
f.write(COMMENT)
f.write('\n'.join(result))
f.write(''.join(post))
f.close()
collect_text = etree.XPath("string()")
find_enums = etree.XPath(
"//html:pre[@class = 'programlisting' and contains(text(), 'Enum')]",
namespaces = {'html' : 'http://www.w3.org/1999/xhtml'})
def parse_enums(html_dir, html_filename, enum_dict):
PARSE_ENUM_NAME = re.compile('\s*enum\s+(\w+)\s*{', re.I).match
PARSE_ENUM_VALUE = re.compile('\s*=\s+([0-9]+)\s*(?::\s*(.*))?').match
tree = etree.parse(os.path.join(html_dir, html_filename))
enums = find_enums(tree)
for enum in enums:
enum_name = PARSE_ENUM_NAME(collect_text(enum))
if not enum_name:
continue
enum_name = enum_name.group(1)
if enum_name not in ENUM_MAP:
continue
print("Found enum", enum_name)
entries = []
for child in enum:
name = child.text
match = PARSE_ENUM_VALUE(child.tail)
if not match:
print("Ignoring enum %s (failed to parse field '%s')" % (
enum_name, name))
break
value, descr = match.groups()
entries.append((name, int(value), descr))
else:
enum_dict[enum_name] = entries
return enum_dict
enum_dict = {}
parse_enums(HTML_DIR, 'libxml-xmlerror.html', enum_dict)
#parse_enums(HTML_DIR, 'libxml-xpath.html', enum_dict)
#parse_enums(HTML_DIR, 'libxml-xmlschemas.html', enum_dict)
parse_enums(HTML_DIR, 'libxml-relaxng.html', enum_dict)
# regenerate source files
pxi_result = []
append_pxi = pxi_result.append
pxd_result = []
append_pxd = pxd_result.append
append_pxd('cdef extern from "libxml/xmlerror.h":')
append_pxi('''\
# Constants are stored in tuples of strings, for which Cython generates very
# efficient setup code. To parse them, iterate over the tuples and parse each
# line in each string independently. Tuples of strings (instead of a plain
# string) are required as some C-compilers of a certain well-known OS vendor
# cannot handle strings that are a few thousand bytes in length.
''')
ctypedef_indent = ' '*4
constant_indent = ctypedef_indent*2
for enum_name in ENUM_ORDER:
constants = enum_dict[enum_name]
pxi_name, prefix = ENUM_MAP[enum_name]
append_pxd(ctypedef_indent + 'ctypedef enum %s:' % enum_name)
append_pxi('cdef object %s = (u"""\\' % pxi_name)
prefix_len = len(prefix)
length = 2 # each string ends with '\n\0'
for name, val, descr in constants:
if descr and descr != str(val):
line = '%-50s = %7d # %s' % (name, val, descr)
else:
line = '%-50s = %7d' % (name, val)
append_pxd(constant_indent + line)
if name[:prefix_len] == prefix and len(name) > prefix_len:
name = name[prefix_len:]
line = '%s=%d' % (name, val)
if length + len(line) >= 2040: # max string length in MSVC is 2048
append_pxi('""",')
append_pxi('u"""\\')
length = 2 # each string ends with '\n\0'
append_pxi(line)
length += len(line) + 2 # + '\n\0'
append_pxd('')
append_pxi('""",)')
append_pxi('')
# write source files
print("Updating file %s" % BUILD_SOURCE_FILE)
regenerate_file(BUILD_SOURCE_FILE, pxi_result)
print("Updating file %s" % BUILD_DEF_FILE)
regenerate_file(BUILD_DEF_FILE, pxd_result)
print("Done")
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