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dist/ba_data/python-site-packages/waitress/rfc7230.py

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+"""
+This contains a bunch of RFC7230 definitions and regular expressions that are
+needed to properly parse HTTP messages.
+"""
+
+import re
+
+HEXDIG = "[0-9a-fA-F]"
+DIGIT = "[0-9]"
+
+WS = "[ \t]"
+OWS = WS + "{0,}?"
+RWS = WS + "{1,}?"
+BWS = OWS
+
+# RFC 7230 Section 3.2.6 "Field Value Components":
+# tchar          = "!" / "#" / "$" / "%" / "&" / "'" / "*"
+#                / "+" / "-" / "." / "^" / "_" / "`" / "|" / "~"
+#                / DIGIT / ALPHA
+# obs-text      = %x80-FF
+TCHAR = r"[!#$%&'*+\-.^_`|~0-9A-Za-z]"
+OBS_TEXT = r"\x80-\xff"
+
+TOKEN = TCHAR + "{1,}"
+
+# RFC 5234 Appendix B.1 "Core Rules":
+# VCHAR         =  %x21-7E
+#                  ; visible (printing) characters
+VCHAR = r"\x21-\x7e"
+
+# The '\\' between \x5b and \x5d is needed to escape \x5d (']')
+QDTEXT = "[\t \x21\x23-\x5b\\\x5d-\x7e" + OBS_TEXT + "]"
+
+QUOTED_PAIR = r"\\" + "([\t " + VCHAR + OBS_TEXT + "])"
+QUOTED_STRING = '"(?:(?:' + QDTEXT + ")|(?:" + QUOTED_PAIR + '))*"'
+
+# header-field   = field-name ":" OWS field-value OWS
+# field-name     = token
+# field-value    = *( field-content / obs-fold )
+# field-content  = field-vchar [ 1*( SP / HTAB ) field-vchar ]
+# field-vchar    = VCHAR / obs-text
+
+# Errata from: https://www.rfc-editor.org/errata_search.php?rfc=7230&eid=4189
+# changes field-content to:
+#
+# field-content  = field-vchar [ 1*( SP / HTAB / field-vchar )
+#                  field-vchar ]
+
+FIELD_VCHAR = "[" + VCHAR + OBS_TEXT + "]"
+# Field content is more greedy than the ABNF, in that it will match the whole value
+FIELD_CONTENT = FIELD_VCHAR + "+(?:[ \t]+" + FIELD_VCHAR + "+)*"
+# Which allows the field value here to just see if there is even a value in the first place
+FIELD_VALUE = "(?:" + FIELD_CONTENT + ")?"
+
+# chunk-ext      = *( ";" chunk-ext-name [ "=" chunk-ext-val ] )
+# chunk-ext-name = token
+# chunk-ext-val  = token / quoted-string
+
+CHUNK_EXT_NAME = TOKEN
+CHUNK_EXT_VAL = "(?:" + TOKEN + ")|(?:" + QUOTED_STRING + ")"
+CHUNK_EXT = (
+    "(?:;(?P<extension>" + CHUNK_EXT_NAME + ")(?:=(?P<value>" + CHUNK_EXT_VAL + "))?)*"
+)
+
+# Pre-compiled regular expressions for use elsewhere
+ONLY_HEXDIG_RE = re.compile(("^" + HEXDIG + "+$").encode("latin-1"))
+ONLY_DIGIT_RE = re.compile(("^" + DIGIT + "+$").encode("latin-1"))
+HEADER_FIELD_RE = re.compile(
+    (
+        "^(?P<name>" + TOKEN + "):" + OWS + "(?P<value>" + FIELD_VALUE + ")" + OWS + "$"
+    ).encode("latin-1")
+)
+QUOTED_PAIR_RE = re.compile(QUOTED_PAIR)
+QUOTED_STRING_RE = re.compile(QUOTED_STRING)
+CHUNK_EXT_RE = re.compile(("^" + CHUNK_EXT + "$").encode("latin-1"))