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⚡ Simplify header-fld-name parser
This speeds up my (new) fetch tests/benchmarks by ~10% over 0.4.3, and by 15%-30% over earlier versions.
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+82
-34
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3 files changed

+82
-34
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‎benchmarks/parser.yml

Lines changed: 15 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -96,6 +96,16 @@ benchmark:
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response = load_response("../test/net/imap/fixtures/response_parser/continuation_requests.yml",
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"test_continuation_request_without_response_text")
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script: parser.parse(response)
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- name: fetch_msg_att_HEADER.FIELDS
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prelude: |2
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response = load_response("../test/net/imap/fixtures/response_parser/fetch_responses.yml",
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"test_fetch_msg_att_HEADER.FIELDS")
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script: parser.parse(response)
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- name: fetch_msg_att_HEADER.FIELDS.NOT
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prelude: |2
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response = load_response("../test/net/imap/fixtures/response_parser/fetch_responses.yml",
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"test_fetch_msg_att_HEADER.FIELDS.NOT")
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script: parser.parse(response)
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- name: fetch_msg_att_flags_and_uid
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prelude: |2
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response = load_response("../test/net/imap/fixtures/response_parser/fetch_responses.yml",
@@ -171,6 +181,11 @@ benchmark:
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response = load_response("../test/net/imap/fixtures/response_parser/quirky_behaviors.yml",
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"test_invalid_noop_response_with_numeric_prefix")
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script: parser.parse(response)
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- name: invalid_noop_response_with_numeric_prefix_and_unparseable_data
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prelude: |2
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response = load_response("../test/net/imap/fixtures/response_parser/quirky_behaviors.yml",
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"test_invalid_noop_response_with_numeric_prefix_and_unparseable_data")
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script: parser.parse(response)
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- name: invalid_noop_response_with_unparseable_data
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prelude: |2
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response = load_response("../test/net/imap/fixtures/response_parser/quirky_behaviors.yml",

‎lib/net/imap/response_parser.rb

Lines changed: 19 additions & 34 deletions
Original file line numberDiff line numberDiff line change
@@ -1101,47 +1101,32 @@ def header_list
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end
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# RFC3501 & RFC9051:
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# header-fld-name = astring
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# header-fld-name = astring
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#
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# NOTE: Previously, Net::IMAP recreated the raw original source string.
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# Now, it grabs the raw encoded value using @str and @pos. A future
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# version may simply return the decoded astring value. Although that is
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# technically incompatible, it should almost never make a difference: all
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# standard header field names are valid atoms:
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#
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# https://www.iana.org/assignments/message-headers/message-headers.xhtml
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#
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# Although RFC3501 allows any astring, RFC5322-valid header names are one
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# or more of the printable US-ASCII characters, except SP and colon. So
11081116
# empty string isn't valid, and literals aren't needed and should not be
1109-
# used. This syntax is unchanged by [I18N-HDRS] (RFC6532).
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# used. This is explicitly unchanged by [I18N-HDRS] (RFC6532).
11101118
#
11111119
# RFC5233:
1112-
# optional-field = field-name ":" unstructured CRLF
1113-
# field-name = 1*ftext
1114-
# ftext = %d33-57 / ; Printable US-ASCII
1115-
# %d59-126 ; characters not including
1116-
# ; ":".
1117-
#
1118-
# Atom and quoted should be sufficient.
1119-
#
1120-
# TODO: Use original source string, rather than decode and re-encode.
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# TODO: or at least, DRY up this code with the send_command formatting.
1120+
# optional-field = field-name ":" unstructured CRLF
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# field-name = 1*ftext
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# ftext = %d33-57 / ; Printable US-ASCII
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# %d59-126 ; characters not including
1124+
# ; ":".
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def header_fld_name
1123-
case (str = astring)
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when ""
1125-
warn '%s header-fld-name is an invalid RFC5322 field-name: ""' %
1126-
[self.class]
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return '""'
1128-
when /[\x80-\xff\r\n]/n
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warn "%s header-fld-name %p has invalid RFC5322 field-name char: %p" %
1130-
[self.class, str, $&]
1131-
# literal
1132-
return "{" + str.bytesize.to_s + "}" + CRLF + str
1133-
when /[^\x21-\x39\x3b-\xfe]/n
1134-
warn "%s header-fld-name %p has invalid RFC5322 field-name char: %p" %
1135-
[self.class, str, $&]
1136-
# invalid quoted string
1137-
return '"' + str.gsub(/["\\]/n, "\\\\\\&") + '"'
1138-
when /[(){ \x00-\x1f\x7f%*"\\]/n
1139-
# quoted string
1140-
return '"' + str.gsub(/["\\]/n, "\\\\\\&") + '"'
1141-
else
1142-
# atom
1143-
return str
1144-
end
1126+
assert_no_lookahead
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start = @pos
1128+
astring
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@str[start...@pos - 1]
11451130
end
11461131

11471132
# mailbox-data = "FLAGS" SP flag-list / "LIST" SP mailbox-list /

‎test/net/imap/fixtures/response_parser/fetch_responses.yml

Lines changed: 48 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -40,6 +40,54 @@
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UID: 5
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raw_data: "* 1 FETCH (FLAGS (\\Seen $MDNSent \\Flagged Custom) UID 5)\r\n"
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43+
test_fetch_msg_att_HEADER.FIELDS:
44+
:response: &test_fetch_msg_att_HEADER_FIELDS
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"* 20367 FETCH (BODY[HEADER.FIELDS (List-ID List-Unsubscribe
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List-Unsubscribe-Post List-Owner List-Archive)] {291}\r\nList-Unsubscribe:
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manage-example-lists
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xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
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xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\r\n
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xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\r\n
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xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\r\n
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xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\r\n\r\n)\r\n"
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:expected: !ruby/struct:Net::IMAP::UntaggedResponse
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name: FETCH
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data: !ruby/struct:Net::IMAP::FetchData
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seqno: 20367
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attr:
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BODY[HEADER.FIELDS (List-ID List-Unsubscribe List-Unsubscribe-Post List-Owner List-Archive)]: "List-Unsubscribe:
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manage-example-lists xxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\r\n
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xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\r\n xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\r\n
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xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\r\n\r\n"
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raw_data: *test_fetch_msg_att_HEADER_FIELDS
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test_fetch_msg_att_HEADER.FIELDS.NOT:
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:response: &test_fetch_msg_att_HEADER_FIELDS_NOT
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"* 20368 FETCH (BODY[HEADER.FIELDS.NOT (Received DKIM-Signature List-Unsubscribe
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ARC-Seal ARC-Authentication-Results Authentication-Results ARC-Message-Signature
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Received-SPF X-Received Mime-Version Content-Type Content-Transfer-Encoding
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X-AUTO-Response-Suppress X-Google-Smtp-Source)]
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{307}\r\nDelivered-To: [email protected]\r\nReturn-Path:
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<[email protected]>\r\nDate: Thu, 02 Nov 2023 10:10:17 -0700\r\nFrom:
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Example <[email protected]>\r\nMessage-ID:
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<[email protected]>\r\nSubject:
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[Example] You've hit 75% of your spending limit for the Tester\r\n
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account\r\n\r\n)\r\n"
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:expected: !ruby/struct:Net::IMAP::UntaggedResponse
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name: FETCH
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data: !ruby/struct:Net::IMAP::FetchData
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seqno: 20368
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attr:
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? BODY[HEADER.FIELDS.NOT (Received DKIM-Signature List-Unsubscribe ARC-Seal
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ARC-Authentication-Results Authentication-Results ARC-Message-Signature
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Received-SPF X-Received Mime-Version Content-Type Content-Transfer-Encoding
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X-AUTO-Response-Suppress X-Google-Smtp-Source)]
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: "Delivered-To: [email protected]\r\nReturn-Path: <[email protected]>\r\nDate:
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Thu, 02 Nov 2023 10:10:17 -0700\r\nFrom: Example <[email protected]>\r\nMessage-ID:
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<[email protected]>\r\nSubject: [Example]
88+
You've hit 75% of your spending limit for the Tester\r\n account\r\n\r\n"
89+
raw_data: *test_fetch_msg_att_HEADER_FIELDS_NOT
90+
4391
test_invalid_fetch_msg_att_extra_space:
4492
:response: "* 1 FETCH (UID 92285 )\r\n"
4593
:expected: !ruby/struct:Net::IMAP::UntaggedResponse

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