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"""Utilities for parsing source text """ from __future__ import annotations import re from typing import Match, TypeVar from .entities import entities def charCodeAt(src: str, pos: int) -> int | None: """ Returns the Unicode value of the character at the specified location. @param - index The zero-based index of the desired character. If there is no character at the specified index, NaN is returned. This was added for compatibility with python """ try: return ord(src[pos]) except IndexError: return None def charStrAt(src: str, pos: int) -> str | None: """ Returns the Unicode value of the character at the specified location. @param - index The zero-based index of the desired character. If there is no character at the specified index, NaN is returned. This was added for compatibility with python """ try: return src[pos] except IndexError: return None _ItemTV = TypeVar("_ItemTV") def arrayReplaceAt( src: list[_ItemTV], pos: int, newElements: list[_ItemTV] ) -> list[_ItemTV]: """ Remove element from array and put another array at those position. Useful for some operations with tokens """ return src[:pos] + newElements + src[pos + 1 :] def isValidEntityCode(c: int) -> bool: # broken sequence if c >= 0xD800 and c <= 0xDFFF: return False # never used if c >= 0xFDD0 and c <= 0xFDEF: return False if ((c & 0xFFFF) == 0xFFFF) or ((c & 0xFFFF) == 0xFFFE): return False # control codes if c >= 0x00 and c <= 0x08: return False if c == 0x0B: return False if c >= 0x0E and c <= 0x1F: return False if c >= 0x7F and c <= 0x9F: return False # out of range if c > 0x10FFFF: return False return True def fromCodePoint(c: int) -> str: """Convert ordinal to unicode. Note, in the original Javascript two string characters were required, for codepoints larger than `0xFFFF`. But Python 3 can represent any unicode codepoint in one character. """ return chr(c) # UNESCAPE_MD_RE = re.compile(r'\\([!"#$%&\'()*+,\-.\/:;<=>?@[\\\]^_`{|}~])') # ENTITY_RE_g = re.compile(r'&([a-z#][a-z0-9]{1,31})', re.IGNORECASE) UNESCAPE_ALL_RE = re.compile( r'\\([!"#$%&\'()*+,\-.\/:;<=>?@[\\\]^_`{|}~])' + "|" + r"&([a-z#][a-z0-9]{1,31});", re.IGNORECASE, ) DIGITAL_ENTITY_BASE10_RE = re.compile(r"#([0-9]{1,8})") DIGITAL_ENTITY_BASE16_RE = re.compile(r"#x([a-f0-9]{1,8})", re.IGNORECASE) def replaceEntityPattern(match: str, name: str) -> str: """Convert HTML entity patterns, see https://spec.commonmark.org/0.30/#entity-references """ if name in entities: return entities[name] code: None | int = None if pat := DIGITAL_ENTITY_BASE10_RE.fullmatch(name): code = int(pat.group(1), 10) elif pat := DIGITAL_ENTITY_BASE16_RE.fullmatch(name): code = int(pat.group(1), 16) if code is not None and isValidEntityCode(code): return fromCodePoint(code) return match def unescapeAll(string: str) -> str: def replacer_func(match: Match[str]) -> str: escaped = match.group(1) if escaped: return escaped entity = match.group(2) return replaceEntityPattern(match.group(), entity) if "\\" not in string and "&" not in string: return string return UNESCAPE_ALL_RE.sub(replacer_func, string) ESCAPABLE = r"""\\!"#$%&'()*+,./:;<=>?@\[\]^`{}|_~-""" ESCAPE_CHAR = re.compile(r"\\([" + ESCAPABLE + r"])") def stripEscape(string: str) -> str: """Strip escape \\ characters""" return ESCAPE_CHAR.sub(r"\1", string) def escapeHtml(raw: str) -> str: """Replace special characters "&", "<", ">" and '"' to HTML-safe sequences.""" # like html.escape, but without escaping single quotes raw = raw.replace("&", "&") # Must be done first! raw = raw.replace("<", "<") raw = raw.replace(">", ">") raw = raw.replace('"', """) return raw # ////////////////////////////////////////////////////////////////////////////// REGEXP_ESCAPE_RE = re.compile(r"[.?*+^$[\]\\(){}|-]") def escapeRE(string: str) -> str: string = REGEXP_ESCAPE_RE.sub("\\$&", string) return string # ////////////////////////////////////////////////////////////////////////////// def isSpace(code: int | None) -> bool: """Check if character code is a whitespace.""" return code in (0x09, 0x20) def isStrSpace(ch: str | None) -> bool: """Check if character is a whitespace.""" return ch in ("\t", " ") MD_WHITESPACE = { 0x09, # \t 0x0A, # \n 0x0B, # \v 0x0C, # \f 0x0D, # \r 0x20, # space 0xA0, 0x1680, 0x202F, 0x205F, 0x3000, } def isWhiteSpace(code: int) -> bool: r"""Zs (unicode class) || [\t\f\v\r\n]""" if code >= 0x2000 and code <= 0x200A: return True return code in MD_WHITESPACE # ////////////////////////////////////////////////////////////////////////////// UNICODE_PUNCT_RE = re.compile( r"[!-#%-\*,-\/:;\?@\[-\]_\{\}\xA1\xA7\xAB\xB6\xB7\xBB\xBF\u037E\u0387\u055A-\u055F\u0589\u058A\u05BE\u05C0\u05C3\u05C6\u05F3\u05F4\u0609\u060A\u060C\u060D\u061B\u061E\u061F\u066A-\u066D\u06D4\u0700-\u070D\u07F7-\u07F9\u0830-\u083E\u085E\u0964\u0965\u0970\u09FD\u0A76\u0AF0\u0C84\u0DF4\u0E4F\u0E5A\u0E5B\u0F04-\u0F12\u0F14\u0F3A-\u0F3D\u0F85\u0FD0-\u0FD4\u0FD9\u0FDA\u104A-\u104F\u10FB\u1360-\u1368\u1400\u166D\u166E\u169B\u169C\u16EB-\u16ED\u1735\u1736\u17D4-\u17D6\u17D8-\u17DA\u1800-\u180A\u1944\u1945\u1A1E\u1A1F\u1AA0-\u1AA6\u1AA8-\u1AAD\u1B5A-\u1B60\u1BFC-\u1BFF\u1C3B-\u1C3F\u1C7E\u1C7F\u1CC0-\u1CC7\u1CD3\u2010-\u2027\u2030-\u2043\u2045-\u2051\u2053-\u205E\u207D\u207E\u208D\u208E\u2308-\u230B\u2329\u232A\u2768-\u2775\u27C5\u27C6\u27E6-\u27EF\u2983-\u2998\u29D8-\u29DB\u29FC\u29FD\u2CF9-\u2CFC\u2CFE\u2CFF\u2D70\u2E00-\u2E2E\u2E30-\u2E4E\u3001-\u3003\u3008-\u3011\u3014-\u301F\u3030\u303D\u30A0\u30FB\uA4FE\uA4FF\uA60D-\uA60F\uA673\uA67E\uA6F2-\uA6F7\uA874-\uA877\uA8CE\uA8CF\uA8F8-\uA8FA\uA8FC\uA92E\uA92F\uA95F\uA9C1-\uA9CD\uA9DE\uA9DF\uAA5C-\uAA5F\uAADE\uAADF\uAAF0\uAAF1\uABEB\uFD3E\uFD3F\uFE10-\uFE19\uFE30-\uFE52\uFE54-\uFE61\uFE63\uFE68\uFE6A\uFE6B\uFF01-\uFF03\uFF05-\uFF0A\uFF0C-\uFF0F\uFF1A\uFF1B\uFF1F\uFF20\uFF3B-\uFF3D\uFF3F\uFF5B\uFF5D\uFF5F-\uFF65]|\uD800[\uDD00-\uDD02\uDF9F\uDFD0]|\uD801\uDD6F|\uD802[\uDC57\uDD1F\uDD3F\uDE50-\uDE58\uDE7F\uDEF0-\uDEF6\uDF39-\uDF3F\uDF99-\uDF9C]|\uD803[\uDF55-\uDF59]|\uD804[\uDC47-\uDC4D\uDCBB\uDCBC\uDCBE-\uDCC1\uDD40-\uDD43\uDD74\uDD75\uDDC5-\uDDC8\uDDCD\uDDDB\uDDDD-\uDDDF\uDE38-\uDE3D\uDEA9]|\uD805[\uDC4B-\uDC4F\uDC5B\uDC5D\uDCC6\uDDC1-\uDDD7\uDE41-\uDE43\uDE60-\uDE6C\uDF3C-\uDF3E]|\uD806[\uDC3B\uDE3F-\uDE46\uDE9A-\uDE9C\uDE9E-\uDEA2]|\uD807[\uDC41-\uDC45\uDC70\uDC71\uDEF7\uDEF8]|\uD809[\uDC70-\uDC74]|\uD81A[\uDE6E\uDE6F\uDEF5\uDF37-\uDF3B\uDF44]|\uD81B[\uDE97-\uDE9A]|\uD82F\uDC9F|\uD836[\uDE87-\uDE8B]|\uD83A[\uDD5E\uDD5F]" # noqa: E501 ) # Currently without astral characters support. def isPunctChar(ch: str) -> bool: """Check if character is a punctuation character.""" return UNICODE_PUNCT_RE.search(ch) is not None MD_ASCII_PUNCT = { 0x21, # /* ! */ 0x22, # /* " */ 0x23, # /* # */ 0x24, # /* $ */ 0x25, # /* % */ 0x26, # /* & */ 0x27, # /* ' */ 0x28, # /* ( */ 0x29, # /* ) */ 0x2A, # /* * */ 0x2B, # /* + */ 0x2C, # /* , */ 0x2D, # /* - */ 0x2E, # /* . */ 0x2F, # /* / */ 0x3A, # /* : */ 0x3B, # /* ; */ 0x3C, # /* < */ 0x3D, # /* = */ 0x3E, # /* > */ 0x3F, # /* ? */ 0x40, # /* @ */ 0x5B, # /* [ */ 0x5C, # /* \ */ 0x5D, # /* ] */ 0x5E, # /* ^ */ 0x5F, # /* _ */ 0x60, # /* ` */ 0x7B, # /* { */ 0x7C, # /* | */ 0x7D, # /* } */ 0x7E, # /* ~ */ } def isMdAsciiPunct(ch: int) -> bool: """Markdown ASCII punctuation characters. :: !, ", #, $, %, &, ', (, ), *, +, ,, -, ., /, :, ;, <, =, >, ?, @, [, \\, ], ^, _, `, {, |, }, or ~ See http://spec.commonmark.org/0.15/#ascii-punctuation-character Don't confuse with unicode punctuation !!! It lacks some chars in ascii range. """ # noqa: E501 return ch in MD_ASCII_PUNCT def normalizeReference(string: str) -> str: """Helper to unify [reference labels].""" # Trim and collapse whitespace # string = re.sub(r"\s+", " ", string.strip()) # In node v10 'ẞ'.toLowerCase() === 'Ṿ', which is presumed to be a bug # fixed in v12 (couldn't find any details). # # So treat this one as a special case # (remove this when node v10 is no longer supported). # # if ('ẞ'.toLowerCase() === 'Ṿ') { # str = str.replace(/ẞ/g, 'ß') # } # .toLowerCase().toUpperCase() should get rid of all differences # between letter variants. # # Simple .toLowerCase() doesn't normalize 125 code points correctly, # and .toUpperCase doesn't normalize 6 of them (list of exceptions: # İ, ϴ, ẞ, Ω, K, Å - those are already uppercased, but have differently # uppercased versions). # # Here's an example showing how it happens. Lets take greek letter omega: # uppercase U+0398 (Θ), U+03f4 (ϴ) and lowercase U+03b8 (θ), U+03d1 (ϑ) # # Unicode entries: # 0398;GREEK CAPITAL LETTER THETA;Lu;0;L;;;;;N;;;;03B8 # 03B8;GREEK SMALL LETTER THETA;Ll;0;L;;;;;N;;;0398;;0398 # 03D1;GREEK THETA SYMBOL;Ll;0;L;<compat> 03B8;;;;N;GREEK SMALL LETTER SCRIPT THETA;;0398;;0398 # 03F4;GREEK CAPITAL THETA SYMBOL;Lu;0;L;<compat> 0398;;;;N;;;;03B8 # # Case-insensitive comparison should treat all of them as equivalent. # # But .toLowerCase() doesn't change ϑ (it's already lowercase), # and .toUpperCase() doesn't change ϴ (already uppercase). # # Applying first lower then upper case normalizes any character: # '\u0398\u03f4\u03b8\u03d1'.toLowerCase().toUpperCase() === '\u0398\u0398\u0398\u0398' # # Note: this is equivalent to unicode case folding; unicode normalization # is a different step that is not required here. # # Final result should be uppercased, because it's later stored in an object # (this avoid a conflict with Object.prototype members, # most notably, `__proto__`) # return string.lower().upper() LINK_OPEN_RE = re.compile(r"^<a[>\s]", flags=re.IGNORECASE) LINK_CLOSE_RE = re.compile(r"^</a\s*>", flags=re.IGNORECASE) def isLinkOpen(string: str) -> bool: return bool(LINK_OPEN_RE.search(string)) def isLinkClose(string: str) -> bool: return bool(LINK_CLOSE_RE.search(string))