Mercurial > repos > shellac > sam_consensus_v3
diff env/lib/python3.9/site-packages/soupsieve/css_parser.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
| author | shellac |
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| date | Mon, 22 Mar 2021 18:12:50 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/env/lib/python3.9/site-packages/soupsieve/css_parser.py Mon Mar 22 18:12:50 2021 +0000 @@ -0,0 +1,1209 @@ +"""CSS selector parser.""" +import re +from functools import lru_cache +from . import util +from . import css_match as cm +from . import css_types as ct +from .util import SelectorSyntaxError +import warnings + +UNICODE_REPLACEMENT_CHAR = 0xFFFD + +# Simple pseudo classes that take no parameters +PSEUDO_SIMPLE = { + ":any-link", + ":empty", + ":first-child", + ":first-of-type", + ":in-range", + ":out-of-range", + ":last-child", + ":last-of-type", + ":link", + ":only-child", + ":only-of-type", + ":root", + ':checked', + ':default', + ':disabled', + ':enabled', + ':indeterminate', + ':optional', + ':placeholder-shown', + ':read-only', + ':read-write', + ':required', + ':scope', + ':defined' +} + +# Supported, simple pseudo classes that match nothing in the Soup Sieve environment +PSEUDO_SIMPLE_NO_MATCH = { + ':active', + ':current', + ':focus', + ':focus-visible', + ':focus-within', + ':future', + ':host', + ':hover', + ':local-link', + ':past', + ':paused', + ':playing', + ':target', + ':target-within', + ':user-invalid', + ':visited' +} + +# Complex pseudo classes that take selector lists +PSEUDO_COMPLEX = { + ':contains', + ':-soup-contains', + ':-soup-contains-own', + ':has', + ':is', + ':matches', + ':not', + ':where' +} + +PSEUDO_COMPLEX_NO_MATCH = { + ':current', + ':host', + ':host-context' +} + +# Complex pseudo classes that take very specific parameters and are handled special +PSEUDO_SPECIAL = { + ':dir', + ':lang', + ':nth-child', + ':nth-last-child', + ':nth-last-of-type', + ':nth-of-type' +} + +PSEUDO_SUPPORTED = PSEUDO_SIMPLE | PSEUDO_SIMPLE_NO_MATCH | PSEUDO_COMPLEX | PSEUDO_COMPLEX_NO_MATCH | PSEUDO_SPECIAL + +# Sub-patterns parts +# Whitespace +NEWLINE = r'(?:\r\n|(?!\r\n)[\n\f\r])' +WS = r'(?:[ \t]|{})'.format(NEWLINE) +# Comments +COMMENTS = r'(?:/\*[^*]*\*+(?:[^/*][^*]*\*+)*/)' +# Whitespace with comments included +WSC = r'(?:{ws}|{comments})'.format(ws=WS, comments=COMMENTS) +# CSS escapes +CSS_ESCAPES = r'(?:\\(?:[a-f0-9]{{1,6}}{ws}?|[^\r\n\f]|$))'.format(ws=WS) +CSS_STRING_ESCAPES = r'(?:\\(?:[a-f0-9]{{1,6}}{ws}?|[^\r\n\f]|$|{nl}))'.format(ws=WS, nl=NEWLINE) +# CSS Identifier +IDENTIFIER = r''' +(?:(?:-?(?:[^\x00-\x2f\x30-\x40\x5B-\x5E\x60\x7B-\x9f]|{esc})+|--) +(?:[^\x00-\x2c\x2e\x2f\x3A-\x40\x5B-\x5E\x60\x7B-\x9f]|{esc})*) +'''.format(esc=CSS_ESCAPES) +# `nth` content +NTH = r'(?:[-+])?(?:[0-9]+n?|n)(?:(?<=n){ws}*(?:[-+]){ws}*(?:[0-9]+))?'.format(ws=WSC) +# Value: quoted string or identifier +VALUE = r''' +(?:"(?:\\(?:.|{nl})|[^\\"\r\n\f]+)*?"|'(?:\\(?:.|{nl})|[^\\'\r\n\f]+)*?'|{ident}+) +'''.format(nl=NEWLINE, ident=IDENTIFIER) +# Attribute value comparison. `!=` is handled special as it is non-standard. +ATTR = r''' +(?:{ws}*(?P<cmp>[!~^|*$]?=){ws}*(?P<value>{value})(?:{ws}+(?P<case>[is]))?)?{ws}*\] +'''.format(ws=WSC, value=VALUE) + +# Selector patterns +# IDs (`#id`) +PAT_ID = r'\#{ident}'.format(ident=IDENTIFIER) +# Classes (`.class`) +PAT_CLASS = r'\.{ident}'.format(ident=IDENTIFIER) +# Prefix:Tag (`prefix|tag`) +PAT_TAG = r'(?P<tag_ns>(?:{ident}|\*)?\|)?(?P<tag_name>{ident}|\*)'.format(ident=IDENTIFIER) +# Attributes (`[attr]`, `[attr=value]`, etc.) +PAT_ATTR = r''' +\[{ws}*(?P<attr_ns>(?:{ident}|\*)?\|)?(?P<attr_name>{ident}){attr} +'''.format(ws=WSC, ident=IDENTIFIER, attr=ATTR) +# Pseudo class (`:pseudo-class`, `:pseudo-class(`) +PAT_PSEUDO_CLASS = r'(?P<name>:{ident})(?P<open>\({ws}*)?'.format(ws=WSC, ident=IDENTIFIER) +# Pseudo class special patterns. Matches `:pseudo-class(` for special case pseudo classes. +PAT_PSEUDO_CLASS_SPECIAL = r'(?P<name>:{ident})(?P<open>\({ws}*)'.format(ws=WSC, ident=IDENTIFIER) +# Custom pseudo class (`:--custom-pseudo`) +PAT_PSEUDO_CLASS_CUSTOM = r'(?P<name>:(?=--){ident})'.format(ident=IDENTIFIER) +# Closing pseudo group (`)`) +PAT_PSEUDO_CLOSE = r'{ws}*\)'.format(ws=WSC) +# Pseudo element (`::pseudo-element`) +PAT_PSEUDO_ELEMENT = r':{}'.format(PAT_PSEUDO_CLASS) +# At rule (`@page`, etc.) (not supported) +PAT_AT_RULE = r'@P{ident}'.format(ident=IDENTIFIER) +# Pseudo class `nth-child` (`:nth-child(an+b [of S]?)`, `:first-child`, etc.) +PAT_PSEUDO_NTH_CHILD = r''' +(?P<pseudo_nth_child>{name} +(?P<nth_child>{nth}|even|odd))(?:{wsc}*\)|(?P<of>{comments}*{ws}{wsc}*of{comments}*{ws}{wsc}*)) +'''.format(name=PAT_PSEUDO_CLASS_SPECIAL, wsc=WSC, comments=COMMENTS, ws=WS, nth=NTH) +# Pseudo class `nth-of-type` (`:nth-of-type(an+b)`, `:first-of-type`, etc.) +PAT_PSEUDO_NTH_TYPE = r''' +(?P<pseudo_nth_type>{name} +(?P<nth_type>{nth}|even|odd)){ws}*\) +'''.format(name=PAT_PSEUDO_CLASS_SPECIAL, ws=WSC, nth=NTH) +# Pseudo class language (`:lang("*-de", en)`) +PAT_PSEUDO_LANG = r'{name}(?P<values>{value}(?:{ws}*,{ws}*{value})*){ws}*\)'.format( + name=PAT_PSEUDO_CLASS_SPECIAL, ws=WSC, value=VALUE +) +# Pseudo class direction (`:dir(ltr)`) +PAT_PSEUDO_DIR = r'{name}(?P<dir>ltr|rtl){ws}*\)'.format(name=PAT_PSEUDO_CLASS_SPECIAL, ws=WSC) +# Combining characters (`>`, `~`, ` `, `+`, `,`) +PAT_COMBINE = r'{wsc}*?(?P<relation>[,+>~]|{ws}(?![,+>~])){wsc}*'.format(ws=WS, wsc=WSC) +# Extra: Contains (`:contains(text)`) +PAT_PSEUDO_CONTAINS = r'{name}(?P<values>{value}(?:{ws}*,{ws}*{value})*){ws}*\)'.format( + name=PAT_PSEUDO_CLASS_SPECIAL, ws=WSC, value=VALUE +) + +# Regular expressions +# CSS escape pattern +RE_CSS_ESC = re.compile(r'(?:(\\[a-f0-9]{{1,6}}{ws}?)|(\\[^\r\n\f])|(\\$))'.format(ws=WSC), re.I) +RE_CSS_STR_ESC = re.compile( + r'(?:(\\[a-f0-9]{{1,6}}{ws}?)|(\\[^\r\n\f])|(\\$)|(\\{nl}))'.format(ws=WS, nl=NEWLINE), re.I +) +# Pattern to break up `nth` specifiers +RE_NTH = re.compile( + r'(?P<s1>[-+])?(?P<a>[0-9]+n?|n)(?:(?<=n){ws}*(?P<s2>[-+]){ws}*(?P<b>[0-9]+))?'.format(ws=WSC), + re.I +) +# Pattern to iterate multiple values. +RE_VALUES = re.compile(r'(?:(?P<value>{value})|(?P<split>{ws}*,{ws}*))'.format(ws=WSC, value=VALUE), re.X) +# Whitespace checks +RE_WS = re.compile(WS) +RE_WS_BEGIN = re.compile('^{}*'.format(WSC)) +RE_WS_END = re.compile('{}*$'.format(WSC)) +RE_CUSTOM = re.compile(r'^{}$'.format(PAT_PSEUDO_CLASS_CUSTOM), re.X) + +# Constants +# List split token +COMMA_COMBINATOR = ',' +# Relation token for descendant +WS_COMBINATOR = " " + +# Parse flags +FLG_PSEUDO = 0x01 +FLG_NOT = 0x02 +FLG_RELATIVE = 0x04 +FLG_DEFAULT = 0x08 +FLG_HTML = 0x10 +FLG_INDETERMINATE = 0x20 +FLG_OPEN = 0x40 +FLG_IN_RANGE = 0x80 +FLG_OUT_OF_RANGE = 0x100 +FLG_PLACEHOLDER_SHOWN = 0x200 + +# Maximum cached patterns to store +_MAXCACHE = 500 + + +@lru_cache(maxsize=_MAXCACHE) +def _cached_css_compile(pattern, namespaces, custom, flags): + """Cached CSS compile.""" + + custom_selectors = process_custom(custom) + return cm.SoupSieve( + pattern, + CSSParser(pattern, custom=custom_selectors, flags=flags).process_selectors(), + namespaces, + custom, + flags + ) + + +def _purge_cache(): + """Purge the cache.""" + + _cached_css_compile.cache_clear() + + +def process_custom(custom): + """Process custom.""" + + custom_selectors = {} + if custom is not None: + for key, value in custom.items(): + name = util.lower(key) + if RE_CUSTOM.match(name) is None: + raise SelectorSyntaxError("The name '{}' is not a valid custom pseudo-class name".format(name)) + if name in custom_selectors: + raise KeyError("The custom selector '{}' has already been registered".format(name)) + custom_selectors[css_unescape(name)] = value + return custom_selectors + + +def css_unescape(content, string=False): + """ + Unescape CSS value. + + Strings allow for spanning the value on multiple strings by escaping a new line. + """ + + def replace(m): + """Replace with the appropriate substitute.""" + + if m.group(1): + codepoint = int(m.group(1)[1:], 16) + if codepoint == 0: + codepoint = UNICODE_REPLACEMENT_CHAR + value = chr(codepoint) + elif m.group(2): + value = m.group(2)[1:] + elif m.group(3): + value = '\ufffd' + else: + value = '' + + return value + + return (RE_CSS_ESC if not string else RE_CSS_STR_ESC).sub(replace, content) + + +def escape(ident): + """Escape identifier.""" + + string = [] + length = len(ident) + start_dash = length > 0 and ident[0] == '-' + if length == 1 and start_dash: + # Need to escape identifier that is a single `-` with no other characters + string.append('\\{}'.format(ident)) + else: + for index, c in enumerate(ident): + codepoint = ord(c) + if codepoint == 0x00: + string.append('\ufffd') + elif (0x01 <= codepoint <= 0x1F) or codepoint == 0x7F: + string.append('\\{:x} '.format(codepoint)) + elif (index == 0 or (start_dash and index == 1)) and (0x30 <= codepoint <= 0x39): + string.append('\\{:x} '.format(codepoint)) + elif ( + codepoint in (0x2D, 0x5F) or codepoint >= 0x80 or (0x30 <= codepoint <= 0x39) or + (0x30 <= codepoint <= 0x39) or (0x41 <= codepoint <= 0x5A) or (0x61 <= codepoint <= 0x7A) + ): + string.append(c) + else: + string.append('\\{}'.format(c)) + return ''.join(string) + + +class SelectorPattern(object): + """Selector pattern.""" + + def __init__(self, name, pattern): + """Initialize.""" + + self.name = name + self.re_pattern = re.compile(pattern, re.I | re.X | re.U) + + def get_name(self): + """Get name.""" + + return self.name + + def match(self, selector, index, flags): + """Match the selector.""" + + return self.re_pattern.match(selector, index) + + +class SpecialPseudoPattern(SelectorPattern): + """Selector pattern.""" + + def __init__(self, patterns): + """Initialize.""" + + self.patterns = {} + for p in patterns: + name = p[0] + pattern = p[3](name, p[2]) + for pseudo in p[1]: + self.patterns[pseudo] = pattern + + self.matched_name = None + self.re_pseudo_name = re.compile(PAT_PSEUDO_CLASS_SPECIAL, re.I | re.X | re.U) + + def get_name(self): + """Get name.""" + + return self.matched_name.get_name() + + def match(self, selector, index, flags): + """Match the selector.""" + + pseudo = None + m = self.re_pseudo_name.match(selector, index) + if m: + name = util.lower(css_unescape(m.group('name'))) + pattern = self.patterns.get(name) + if pattern: + pseudo = pattern.match(selector, index, flags) + if pseudo: + self.matched_name = pattern + + return pseudo + + +class _Selector(object): + """ + Intermediate selector class. + + This stores selector data for a compound selector as we are acquiring them. + Once we are done collecting the data for a compound selector, we freeze + the data in an object that can be pickled and hashed. + """ + + def __init__(self, **kwargs): + """Initialize.""" + + self.tag = kwargs.get('tag', None) + self.ids = kwargs.get('ids', []) + self.classes = kwargs.get('classes', []) + self.attributes = kwargs.get('attributes', []) + self.nth = kwargs.get('nth', []) + self.selectors = kwargs.get('selectors', []) + self.relations = kwargs.get('relations', []) + self.rel_type = kwargs.get('rel_type', None) + self.contains = kwargs.get('contains', []) + self.lang = kwargs.get('lang', []) + self.flags = kwargs.get('flags', 0) + self.no_match = kwargs.get('no_match', False) + + def _freeze_relations(self, relations): + """Freeze relation.""" + + if relations: + sel = relations[0] + sel.relations.extend(relations[1:]) + return ct.SelectorList([sel.freeze()]) + else: + return ct.SelectorList() + + def freeze(self): + """Freeze self.""" + + if self.no_match: + return ct.SelectorNull() + else: + return ct.Selector( + self.tag, + tuple(self.ids), + tuple(self.classes), + tuple(self.attributes), + tuple(self.nth), + tuple(self.selectors), + self._freeze_relations(self.relations), + self.rel_type, + tuple(self.contains), + tuple(self.lang), + self.flags + ) + + def __str__(self): # pragma: no cover + """String representation.""" + + return ( + '_Selector(tag={!r}, ids={!r}, classes={!r}, attributes={!r}, nth={!r}, selectors={!r}, ' + 'relations={!r}, rel_type={!r}, contains={!r}, lang={!r}, flags={!r}, no_match={!r})' + ).format( + self.tag, self.ids, self.classes, self.attributes, self.nth, self.selectors, + self.relations, self.rel_type, self.contains, self.lang, self.flags, self.no_match + ) + + __repr__ = __str__ + + +class CSSParser(object): + """Parse CSS selectors.""" + + css_tokens = ( + SelectorPattern("pseudo_close", PAT_PSEUDO_CLOSE), + SpecialPseudoPattern( + ( + ( + "pseudo_contains", + (':contains', ':-soup-contains', ':-soup-contains-own'), + PAT_PSEUDO_CONTAINS, + SelectorPattern + ), + ("pseudo_nth_child", (':nth-child', ':nth-last-child'), PAT_PSEUDO_NTH_CHILD, SelectorPattern), + ("pseudo_nth_type", (':nth-of-type', ':nth-last-of-type'), PAT_PSEUDO_NTH_TYPE, SelectorPattern), + ("pseudo_lang", (':lang',), PAT_PSEUDO_LANG, SelectorPattern), + ("pseudo_dir", (':dir',), PAT_PSEUDO_DIR, SelectorPattern) + ) + ), + SelectorPattern("pseudo_class_custom", PAT_PSEUDO_CLASS_CUSTOM), + SelectorPattern("pseudo_class", PAT_PSEUDO_CLASS), + SelectorPattern("pseudo_element", PAT_PSEUDO_ELEMENT), + SelectorPattern("at_rule", PAT_AT_RULE), + SelectorPattern("id", PAT_ID), + SelectorPattern("class", PAT_CLASS), + SelectorPattern("tag", PAT_TAG), + SelectorPattern("attribute", PAT_ATTR), + SelectorPattern("combine", PAT_COMBINE) + ) + + def __init__(self, selector, custom=None, flags=0): + """Initialize.""" + + self.pattern = selector.replace('\x00', '\ufffd') + self.flags = flags + self.debug = self.flags & util.DEBUG + self.custom = {} if custom is None else custom + + def parse_attribute_selector(self, sel, m, has_selector): + """Create attribute selector from the returned regex match.""" + + inverse = False + op = m.group('cmp') + case = util.lower(m.group('case')) if m.group('case') else None + ns = css_unescape(m.group('attr_ns')[:-1]) if m.group('attr_ns') else '' + attr = css_unescape(m.group('attr_name')) + is_type = False + pattern2 = None + + if case: + flags = re.I if case == 'i' else 0 + elif util.lower(attr) == 'type': + flags = re.I + is_type = True + else: + flags = 0 + + if op: + if m.group('value').startswith(('"', "'")): + value = css_unescape(m.group('value')[1:-1], True) + else: + value = css_unescape(m.group('value')) + else: + value = None + if not op: + # Attribute name + pattern = None + elif op.startswith('^'): + # Value start with + pattern = re.compile(r'^%s.*' % re.escape(value), flags) + elif op.startswith('$'): + # Value ends with + pattern = re.compile(r'.*?%s$' % re.escape(value), flags) + elif op.startswith('*'): + # Value contains + pattern = re.compile(r'.*?%s.*' % re.escape(value), flags) + elif op.startswith('~'): + # Value contains word within space separated list + # `~=` should match nothing if it is empty or contains whitespace, + # so if either of these cases is present, use `[^\s\S]` which cannot be matched. + value = r'[^\s\S]' if not value or RE_WS.search(value) else re.escape(value) + pattern = re.compile(r'.*?(?:(?<=^)|(?<=[ \t\r\n\f]))%s(?=(?:[ \t\r\n\f]|$)).*' % value, flags) + elif op.startswith('|'): + # Value starts with word in dash separated list + pattern = re.compile(r'^%s(?:-.*)?$' % re.escape(value), flags) + else: + # Value matches + pattern = re.compile(r'^%s$' % re.escape(value), flags) + if op.startswith('!'): + # Equivalent to `:not([attr=value])` + inverse = True + if is_type and pattern: + pattern2 = re.compile(pattern.pattern) + + # Append the attribute selector + sel_attr = ct.SelectorAttribute(attr, ns, pattern, pattern2) + if inverse: + # If we are using `!=`, we need to nest the pattern under a `:not()`. + sub_sel = _Selector() + sub_sel.attributes.append(sel_attr) + not_list = ct.SelectorList([sub_sel.freeze()], True, False) + sel.selectors.append(not_list) + else: + sel.attributes.append(sel_attr) + + has_selector = True + return has_selector + + def parse_tag_pattern(self, sel, m, has_selector): + """Parse tag pattern from regex match.""" + + prefix = css_unescape(m.group('tag_ns')[:-1]) if m.group('tag_ns') else None + tag = css_unescape(m.group('tag_name')) + sel.tag = ct.SelectorTag(tag, prefix) + has_selector = True + return has_selector + + def parse_pseudo_class_custom(self, sel, m, has_selector): + """ + Parse custom pseudo class alias. + + Compile custom selectors as we need them. When compiling a custom selector, + set it to `None` in the dictionary so we can avoid an infinite loop. + """ + + pseudo = util.lower(css_unescape(m.group('name'))) + selector = self.custom.get(pseudo) + if selector is None: + raise SelectorSyntaxError( + "Undefined custom selector '{}' found at postion {}".format(pseudo, m.end(0)), + self.pattern, + m.end(0) + ) + + if not isinstance(selector, ct.SelectorList): + self.custom[pseudo] = None + selector = CSSParser( + selector, custom=self.custom, flags=self.flags + ).process_selectors(flags=FLG_PSEUDO) + self.custom[pseudo] = selector + + sel.selectors.append(selector) + has_selector = True + return has_selector + + def parse_pseudo_class(self, sel, m, has_selector, iselector, is_html): + """Parse pseudo class.""" + + complex_pseudo = False + pseudo = util.lower(css_unescape(m.group('name'))) + if m.group('open'): + complex_pseudo = True + if complex_pseudo and pseudo in PSEUDO_COMPLEX: + has_selector = self.parse_pseudo_open(sel, pseudo, has_selector, iselector, m.end(0)) + elif not complex_pseudo and pseudo in PSEUDO_SIMPLE: + if pseudo == ':root': + sel.flags |= ct.SEL_ROOT + elif pseudo == ':defined': + sel.flags |= ct.SEL_DEFINED + is_html = True + elif pseudo == ':scope': + sel.flags |= ct.SEL_SCOPE + elif pseudo == ':empty': + sel.flags |= ct.SEL_EMPTY + elif pseudo in (':link', ':any-link'): + sel.selectors.append(CSS_LINK) + elif pseudo == ':checked': + sel.selectors.append(CSS_CHECKED) + elif pseudo == ':default': + sel.selectors.append(CSS_DEFAULT) + elif pseudo == ':indeterminate': + sel.selectors.append(CSS_INDETERMINATE) + elif pseudo == ":disabled": + sel.selectors.append(CSS_DISABLED) + elif pseudo == ":enabled": + sel.selectors.append(CSS_ENABLED) + elif pseudo == ":required": + sel.selectors.append(CSS_REQUIRED) + elif pseudo == ":optional": + sel.selectors.append(CSS_OPTIONAL) + elif pseudo == ":read-only": + sel.selectors.append(CSS_READ_ONLY) + elif pseudo == ":read-write": + sel.selectors.append(CSS_READ_WRITE) + elif pseudo == ":in-range": + sel.selectors.append(CSS_IN_RANGE) + elif pseudo == ":out-of-range": + sel.selectors.append(CSS_OUT_OF_RANGE) + elif pseudo == ":placeholder-shown": + sel.selectors.append(CSS_PLACEHOLDER_SHOWN) + elif pseudo == ':first-child': + sel.nth.append(ct.SelectorNth(1, False, 0, False, False, ct.SelectorList())) + elif pseudo == ':last-child': + sel.nth.append(ct.SelectorNth(1, False, 0, False, True, ct.SelectorList())) + elif pseudo == ':first-of-type': + sel.nth.append(ct.SelectorNth(1, False, 0, True, False, ct.SelectorList())) + elif pseudo == ':last-of-type': + sel.nth.append(ct.SelectorNth(1, False, 0, True, True, ct.SelectorList())) + elif pseudo == ':only-child': + sel.nth.extend( + [ + ct.SelectorNth(1, False, 0, False, False, ct.SelectorList()), + ct.SelectorNth(1, False, 0, False, True, ct.SelectorList()) + ] + ) + elif pseudo == ':only-of-type': + sel.nth.extend( + [ + ct.SelectorNth(1, False, 0, True, False, ct.SelectorList()), + ct.SelectorNth(1, False, 0, True, True, ct.SelectorList()) + ] + ) + has_selector = True + elif complex_pseudo and pseudo in PSEUDO_COMPLEX_NO_MATCH: + self.parse_selectors(iselector, m.end(0), FLG_PSEUDO | FLG_OPEN) + sel.no_match = True + has_selector = True + elif not complex_pseudo and pseudo in PSEUDO_SIMPLE_NO_MATCH: + sel.no_match = True + has_selector = True + elif pseudo in PSEUDO_SUPPORTED: + raise SelectorSyntaxError( + "Invalid syntax for pseudo class '{}'".format(pseudo), + self.pattern, + m.start(0) + ) + else: + raise NotImplementedError( + "'{}' pseudo-class is not implemented at this time".format(pseudo) + ) + + return has_selector, is_html + + def parse_pseudo_nth(self, sel, m, has_selector, iselector): + """Parse `nth` pseudo.""" + + mdict = m.groupdict() + if mdict.get('pseudo_nth_child'): + postfix = '_child' + else: + postfix = '_type' + mdict['name'] = util.lower(css_unescape(mdict['name'])) + content = util.lower(mdict.get('nth' + postfix)) + if content == 'even': + # 2n + s1 = 2 + s2 = 0 + var = True + elif content == 'odd': + # 2n+1 + s1 = 2 + s2 = 1 + var = True + else: + nth_parts = RE_NTH.match(content) + s1 = '-' if nth_parts.group('s1') and nth_parts.group('s1') == '-' else '' + a = nth_parts.group('a') + var = a.endswith('n') + if a.startswith('n'): + s1 += '1' + elif var: + s1 += a[:-1] + else: + s1 += a + s2 = '-' if nth_parts.group('s2') and nth_parts.group('s2') == '-' else '' + if nth_parts.group('b'): + s2 += nth_parts.group('b') + else: + s2 = '0' + s1 = int(s1, 10) + s2 = int(s2, 10) + + pseudo_sel = mdict['name'] + if postfix == '_child': + if m.group('of'): + # Parse the rest of `of S`. + nth_sel = self.parse_selectors(iselector, m.end(0), FLG_PSEUDO | FLG_OPEN) + else: + # Use default `*|*` for `of S`. + nth_sel = CSS_NTH_OF_S_DEFAULT + if pseudo_sel == ':nth-child': + sel.nth.append(ct.SelectorNth(s1, var, s2, False, False, nth_sel)) + elif pseudo_sel == ':nth-last-child': + sel.nth.append(ct.SelectorNth(s1, var, s2, False, True, nth_sel)) + else: + if pseudo_sel == ':nth-of-type': + sel.nth.append(ct.SelectorNth(s1, var, s2, True, False, ct.SelectorList())) + elif pseudo_sel == ':nth-last-of-type': + sel.nth.append(ct.SelectorNth(s1, var, s2, True, True, ct.SelectorList())) + has_selector = True + return has_selector + + def parse_pseudo_open(self, sel, name, has_selector, iselector, index): + """Parse pseudo with opening bracket.""" + + flags = FLG_PSEUDO | FLG_OPEN + if name == ':not': + flags |= FLG_NOT + if name == ':has': + flags |= FLG_RELATIVE + + sel.selectors.append(self.parse_selectors(iselector, index, flags)) + has_selector = True + return has_selector + + def parse_has_combinator(self, sel, m, has_selector, selectors, rel_type, index): + """Parse combinator tokens.""" + + combinator = m.group('relation').strip() + if not combinator: + combinator = WS_COMBINATOR + if combinator == COMMA_COMBINATOR: + if not has_selector: + # If we've not captured any selector parts, the comma is either at the beginning of the pattern + # or following another comma, both of which are unexpected. Commas must split selectors. + raise SelectorSyntaxError( + "The combinator '{}' at postion {}, must have a selector before it".format(combinator, index), + self.pattern, + index + ) + sel.rel_type = rel_type + selectors[-1].relations.append(sel) + rel_type = ":" + WS_COMBINATOR + selectors.append(_Selector()) + else: + if has_selector: + # End the current selector and associate the leading combinator with this selector. + sel.rel_type = rel_type + selectors[-1].relations.append(sel) + elif rel_type[1:] != WS_COMBINATOR: + # It's impossible to have two whitespace combinators after each other as the patterns + # will gobble up trailing whitespace. It is also impossible to have a whitespace + # combinator after any other kind for the same reason. But we could have + # multiple non-whitespace combinators. So if the current combinator is not a whitespace, + # then we've hit the multiple combinator case, so we should fail. + raise SelectorSyntaxError( + 'The multiple combinators at position {}'.format(index), + self.pattern, + index + ) + # Set the leading combinator for the next selector. + rel_type = ':' + combinator + sel = _Selector() + + has_selector = False + return has_selector, sel, rel_type + + def parse_combinator(self, sel, m, has_selector, selectors, relations, is_pseudo, index): + """Parse combinator tokens.""" + + combinator = m.group('relation').strip() + if not combinator: + combinator = WS_COMBINATOR + if not has_selector: + raise SelectorSyntaxError( + "The combinator '{}' at postion {}, must have a selector before it".format(combinator, index), + self.pattern, + index + ) + + if combinator == COMMA_COMBINATOR: + if not sel.tag and not is_pseudo: + # Implied `*` + sel.tag = ct.SelectorTag('*', None) + sel.relations.extend(relations) + selectors.append(sel) + del relations[:] + else: + sel.relations.extend(relations) + sel.rel_type = combinator + del relations[:] + relations.append(sel) + sel = _Selector() + + has_selector = False + return has_selector, sel + + def parse_class_id(self, sel, m, has_selector): + """Parse HTML classes and ids.""" + + selector = m.group(0) + if selector.startswith('.'): + sel.classes.append(css_unescape(selector[1:])) + else: + sel.ids.append(css_unescape(selector[1:])) + has_selector = True + return has_selector + + def parse_pseudo_contains(self, sel, m, has_selector): + """Parse contains.""" + + pseudo = util.lower(css_unescape(m.group('name'))) + if pseudo == ":contains": + warnings.warn( + "The pseudo class ':contains' is deprecated, ':-soup-contains' should be used moving forward.", + FutureWarning + ) + contains_own = pseudo == ":-soup-contains-own" + values = css_unescape(m.group('values')) + patterns = [] + for token in RE_VALUES.finditer(values): + if token.group('split'): + continue + value = token.group('value') + if value.startswith(("'", '"')): + value = css_unescape(value[1:-1], True) + else: + value = css_unescape(value) + patterns.append(value) + sel.contains.append(ct.SelectorContains(tuple(patterns), contains_own)) + has_selector = True + return has_selector + + def parse_pseudo_lang(self, sel, m, has_selector): + """Parse pseudo language.""" + + values = m.group('values') + patterns = [] + for token in RE_VALUES.finditer(values): + if token.group('split'): + continue + value = token.group('value') + if value.startswith(('"', "'")): + value = css_unescape(value[1:-1], True) + else: + value = css_unescape(value) + + patterns.append(value) + + sel.lang.append(ct.SelectorLang(patterns)) + has_selector = True + + return has_selector + + def parse_pseudo_dir(self, sel, m, has_selector): + """Parse pseudo direction.""" + + value = ct.SEL_DIR_LTR if util.lower(m.group('dir')) == 'ltr' else ct.SEL_DIR_RTL + sel.flags |= value + has_selector = True + return has_selector + + def parse_selectors(self, iselector, index=0, flags=0): + """Parse selectors.""" + + sel = _Selector() + selectors = [] + has_selector = False + closed = False + relations = [] + rel_type = ":" + WS_COMBINATOR + is_open = bool(flags & FLG_OPEN) + is_pseudo = bool(flags & FLG_PSEUDO) + is_relative = bool(flags & FLG_RELATIVE) + is_not = bool(flags & FLG_NOT) + is_html = bool(flags & FLG_HTML) + is_default = bool(flags & FLG_DEFAULT) + is_indeterminate = bool(flags & FLG_INDETERMINATE) + is_in_range = bool(flags & FLG_IN_RANGE) + is_out_of_range = bool(flags & FLG_OUT_OF_RANGE) + is_placeholder_shown = bool(flags & FLG_PLACEHOLDER_SHOWN) + + if self.debug: # pragma: no cover + if is_pseudo: + print(' is_pseudo: True') + if is_open: + print(' is_open: True') + if is_relative: + print(' is_relative: True') + if is_not: + print(' is_not: True') + if is_html: + print(' is_html: True') + if is_default: + print(' is_default: True') + if is_indeterminate: + print(' is_indeterminate: True') + if is_in_range: + print(' is_in_range: True') + if is_out_of_range: + print(' is_out_of_range: True') + if is_placeholder_shown: + print(' is_placeholder_shown: True') + + if is_relative: + selectors.append(_Selector()) + + try: + while True: + key, m = next(iselector) + + # Handle parts + if key == "at_rule": + raise NotImplementedError("At-rules found at position {}".format(m.start(0))) + elif key == 'pseudo_class_custom': + has_selector = self.parse_pseudo_class_custom(sel, m, has_selector) + elif key == 'pseudo_class': + has_selector, is_html = self.parse_pseudo_class(sel, m, has_selector, iselector, is_html) + elif key == 'pseudo_element': + raise NotImplementedError("Pseudo-element found at position {}".format(m.start(0))) + elif key == 'pseudo_contains': + has_selector = self.parse_pseudo_contains(sel, m, has_selector) + elif key in ('pseudo_nth_type', 'pseudo_nth_child'): + has_selector = self.parse_pseudo_nth(sel, m, has_selector, iselector) + elif key == 'pseudo_lang': + has_selector = self.parse_pseudo_lang(sel, m, has_selector) + elif key == 'pseudo_dir': + has_selector = self.parse_pseudo_dir(sel, m, has_selector) + # Currently only supports HTML + is_html = True + elif key == 'pseudo_close': + if not has_selector: + raise SelectorSyntaxError( + "Expected a selector at postion {}".format(m.start(0)), + self.pattern, + m.start(0) + ) + if is_open: + closed = True + break + else: + raise SelectorSyntaxError( + "Unmatched pseudo-class close at postion {}".format(m.start(0)), + self.pattern, + m.start(0) + ) + elif key == 'combine': + if is_relative: + has_selector, sel, rel_type = self.parse_has_combinator( + sel, m, has_selector, selectors, rel_type, index + ) + else: + has_selector, sel = self.parse_combinator( + sel, m, has_selector, selectors, relations, is_pseudo, index + ) + elif key == 'attribute': + has_selector = self.parse_attribute_selector(sel, m, has_selector) + elif key == 'tag': + if has_selector: + raise SelectorSyntaxError( + "Tag name found at position {} instead of at the start".format(m.start(0)), + self.pattern, + m.start(0) + ) + has_selector = self.parse_tag_pattern(sel, m, has_selector) + elif key in ('class', 'id'): + has_selector = self.parse_class_id(sel, m, has_selector) + + index = m.end(0) + except StopIteration: + pass + + if is_open and not closed: + raise SelectorSyntaxError( + "Unclosed pseudo-class at position {}".format(index), + self.pattern, + index + ) + + if has_selector: + if not sel.tag and not is_pseudo: + # Implied `*` + sel.tag = ct.SelectorTag('*', None) + if is_relative: + sel.rel_type = rel_type + selectors[-1].relations.append(sel) + else: + sel.relations.extend(relations) + del relations[:] + selectors.append(sel) + else: + # We will always need to finish a selector when `:has()` is used as it leads with combining. + raise SelectorSyntaxError( + 'Expected a selector at position {}'.format(index), + self.pattern, + index + ) + + # Some patterns require additional logic, such as default. We try to make these the + # last pattern, and append the appropriate flag to that selector which communicates + # to the matcher what additional logic is required. + if is_default: + selectors[-1].flags = ct.SEL_DEFAULT + if is_indeterminate: + selectors[-1].flags = ct.SEL_INDETERMINATE + if is_in_range: + selectors[-1].flags = ct.SEL_IN_RANGE + if is_out_of_range: + selectors[-1].flags = ct.SEL_OUT_OF_RANGE + if is_placeholder_shown: + selectors[-1].flags = ct.SEL_PLACEHOLDER_SHOWN + + return ct.SelectorList([s.freeze() for s in selectors], is_not, is_html) + + def selector_iter(self, pattern): + """Iterate selector tokens.""" + + # Ignore whitespace and comments at start and end of pattern + m = RE_WS_BEGIN.search(pattern) + index = m.end(0) if m else 0 + m = RE_WS_END.search(pattern) + end = (m.start(0) - 1) if m else (len(pattern) - 1) + + if self.debug: # pragma: no cover + print('## PARSING: {!r}'.format(pattern)) + while index <= end: + m = None + for v in self.css_tokens: + m = v.match(pattern, index, self.flags) + if m: + name = v.get_name() + if self.debug: # pragma: no cover + print("TOKEN: '{}' --> {!r} at position {}".format(name, m.group(0), m.start(0))) + index = m.end(0) + yield name, m + break + if m is None: + c = pattern[index] + # If the character represents the start of one of the known selector types, + # throw an exception mentioning that the known selector type is in error; + # otherwise, report the invalid character. + if c == '[': + msg = "Malformed attribute selector at position {}".format(index) + elif c == '.': + msg = "Malformed class selector at position {}".format(index) + elif c == '#': + msg = "Malformed id selector at position {}".format(index) + elif c == ':': + msg = "Malformed pseudo-class selector at position {}".format(index) + else: + msg = "Invalid character {!r} position {}".format(c, index) + raise SelectorSyntaxError(msg, self.pattern, index) + if self.debug: # pragma: no cover + print('## END PARSING') + + def process_selectors(self, index=0, flags=0): + """Process selectors.""" + + return self.parse_selectors(self.selector_iter(self.pattern), index, flags) + + +# Precompile CSS selector lists for pseudo-classes (additional logic may be required beyond the pattern) +# A few patterns are order dependent as they use patterns previous compiled. + +# CSS pattern for `:link` and `:any-link` +CSS_LINK = CSSParser( + 'html|*:is(a, area)[href]' +).process_selectors(flags=FLG_PSEUDO | FLG_HTML) +# CSS pattern for `:checked` +CSS_CHECKED = CSSParser( + ''' + html|*:is(input[type=checkbox], input[type=radio])[checked], html|option[selected] + ''' +).process_selectors(flags=FLG_PSEUDO | FLG_HTML) +# CSS pattern for `:default` (must compile CSS_CHECKED first) +CSS_DEFAULT = CSSParser( + ''' + :checked, + + /* + This pattern must be at the end. + Special logic is applied to the last selector. + */ + html|form html|*:is(button, input)[type="submit"] + ''' +).process_selectors(flags=FLG_PSEUDO | FLG_HTML | FLG_DEFAULT) +# CSS pattern for `:indeterminate` +CSS_INDETERMINATE = CSSParser( + ''' + html|input[type="checkbox"][indeterminate], + html|input[type="radio"]:is(:not([name]), [name=""]):not([checked]), + html|progress:not([value]), + + /* + This pattern must be at the end. + Special logic is applied to the last selector. + */ + html|input[type="radio"][name]:not([name='']):not([checked]) + ''' +).process_selectors(flags=FLG_PSEUDO | FLG_HTML | FLG_INDETERMINATE) +# CSS pattern for `:disabled` +CSS_DISABLED = CSSParser( + ''' + html|*:is(input:not([type=hidden]), button, select, textarea, fieldset, optgroup, option, fieldset)[disabled], + html|optgroup[disabled] > html|option, + html|fieldset[disabled] > html|*:is(input:not([type=hidden]), button, select, textarea, fieldset), + html|fieldset[disabled] > + html|*:not(legend:nth-of-type(1)) html|*:is(input:not([type=hidden]), button, select, textarea, fieldset) + ''' +).process_selectors(flags=FLG_PSEUDO | FLG_HTML) +# CSS pattern for `:enabled` +CSS_ENABLED = CSSParser( + ''' + html|*:is(input:not([type=hidden]), button, select, textarea, fieldset, optgroup, option, fieldset):not(:disabled) + ''' +).process_selectors(flags=FLG_PSEUDO | FLG_HTML) +# CSS pattern for `:required` +CSS_REQUIRED = CSSParser( + 'html|*:is(input, textarea, select)[required]' +).process_selectors(flags=FLG_PSEUDO | FLG_HTML) +# CSS pattern for `:optional` +CSS_OPTIONAL = CSSParser( + 'html|*:is(input, textarea, select):not([required])' +).process_selectors(flags=FLG_PSEUDO | FLG_HTML) +# CSS pattern for `:placeholder-shown` +CSS_PLACEHOLDER_SHOWN = CSSParser( + ''' + html|input:is( + :not([type]), + [type=""], + [type=text], + [type=search], + [type=url], + [type=tel], + [type=email], + [type=password], + [type=number] + )[placeholder]:not([placeholder='']):is(:not([value]), [value=""]), + html|textarea[placeholder]:not([placeholder='']) + ''' +).process_selectors(flags=FLG_PSEUDO | FLG_HTML | FLG_PLACEHOLDER_SHOWN) +# CSS pattern default for `:nth-child` "of S" feature +CSS_NTH_OF_S_DEFAULT = CSSParser( + '*|*' +).process_selectors(flags=FLG_PSEUDO) +# CSS pattern for `:read-write` (CSS_DISABLED must be compiled first) +CSS_READ_WRITE = CSSParser( + ''' + html|*:is( + textarea, + input:is( + :not([type]), + [type=""], + [type=text], + [type=search], + [type=url], + [type=tel], + [type=email], + [type=number], + [type=password], + [type=date], + [type=datetime-local], + [type=month], + [type=time], + [type=week] + ) + ):not([readonly], :disabled), + html|*:is([contenteditable=""], [contenteditable="true" i]) + ''' +).process_selectors(flags=FLG_PSEUDO | FLG_HTML) +# CSS pattern for `:read-only` +CSS_READ_ONLY = CSSParser( + ''' + html|*:not(:read-write) + ''' +).process_selectors(flags=FLG_PSEUDO | FLG_HTML) +# CSS pattern for `:in-range` +CSS_IN_RANGE = CSSParser( + ''' + html|input:is( + [type="date"], + [type="month"], + [type="week"], + [type="time"], + [type="datetime-local"], + [type="number"], + [type="range"] + ):is( + [min], + [max] + ) + ''' +).process_selectors(flags=FLG_PSEUDO | FLG_IN_RANGE | FLG_HTML) +# CSS pattern for `:out-of-range` +CSS_OUT_OF_RANGE = CSSParser( + ''' + html|input:is( + [type="date"], + [type="month"], + [type="week"], + [type="time"], + [type="datetime-local"], + [type="number"], + [type="range"] + ):is( + [min], + [max] + ) + ''' +).process_selectors(flags=FLG_PSEUDO | FLG_OUT_OF_RANGE | FLG_HTML)