Add PDF syntax to Rouge

lib/rouge/demos/pdf

@@ -0,0 +1,29 @@
+%PDF-1.6
+%©©©©
+
+1 0 obj<</Type/Catalog/Pages 2 0 R/StructTreeRoot null/MarkInfo<</Marked false>>>>
+endobj
+2 0 obj<</Type/Pages/Kids[3 0 R]/Count 1>>
+endobj
+3 0 obj<</Type/Page/Parent 2 0 R/MediaBox[.0 0 200 200]/Contents 4 0 R/Resources<<>>>>
+endobj
+4 0 obj<</Length 60>>
+stream
+ +8 w 1 j
+ 1.0 0 0 rg
+ 0 0 1 RG
+ 10 10 180 180 re B
+endstream
+endobj
+xref
+0 5
+0000000000 65535 f
+0000000021 00000 n
+0000000113 00000 n
+0000000165 00000 n
+0000000261 00000 n
+trailer
+<</Root 1 0 R/Size 5/ID[<18D6B641245C03F28E67D93AD879D6EC><18D6B641245C03F28E67D93AD879D6EC>]>>
+startxref
+371
+%%EOF

lib/rouge/lexers/pdf.rb

@@ -0,0 +1,108 @@
+# -*- coding: utf-8 -*- #
+# frozen_string_literal: true
+# vim: set ts=2 sw=2 et:
+
+# PDF = Portable Document Format page description language
+# As defined by ISO 32000-2:2020 including resolved errata from https://pdf-issues.pdfa.org/
+#
+# The PDF syntax is also known as "COS" and can be used with FDF (Forms Data Field) files as
+# per ISO 32000-2:2020 clause 12.7.8. 
+#
+# This is a token-based parser ONLY! It is intended to syntax highlight full or partial fragments 
+# of nicely written hand-writteen PDF syntax in documentation such as ISO specifications. It is NOT
+# intended to cope with real-world PDFs that will contain arbitrary binary data (that form invalid
+# UTF-8 sequences and generate "ArgumentError: invalid byte sequence in UTF-8" Ruby errors) and 
+# other types of malformations or syntax errors. 
+#
+# Author: Peter Wyatt, CTO, PDF Association. 2024
+#
+module Rouge
+ module Lexers
+ class Pdf < RegexLexer
+ title "PDF"
+ desc "PDF - Portable Document Format (ISO 32000)"
+ tag 'pdf'
+ aliases "fdf", 'cos'
+ filenames '*.pdf', '*.fdf'
+ mimetypes 'application/pdf', 'application/fdf' # IANA registered media types
+
+ # PDF and FDF files must start with "%PDF-x.y" or "%FDF-x.y"
+ # where x is the single digit major version and y is the single digit minor version.
+ def self.detect?(text)
+ return true if /^%(P|F)DF-\d.\d/ =~ text
+ end
+
+ # PDF Delimiters (ISO 32000-2:2020, Table 1 and Table 2).
+ # Ruby whitespace "\s" is /[ \t\r\n\f\v]/ which does not include NUL (ISO 32000-2:2020, Table 1).
+ # PDF also support 2 character EOL sequences.
+
+ state :root do
+ # Start-of-file header comment is special (comment is up to EOL)
+ rule %r/^%(P|F)DF-\d\.\d.*$/, Comment::Preproc
+
+ # End-of-file marker comment is special (comment is up to EOL)
+ rule %r/^%%EOF.*$/, Comment::Preproc
+
+ # PDF only has single-line comments: from "%" to EOL
+ rule %r/%.*$/, Comment::Single
+
+ # PDF Boolean and null object keywords
+ rule %r/(false|true|null)/, Keyword::Constant
+
+ # PDF Dictionary and array object start and end tokens
+ rule %r/(<<|>>|\[|\])/, Punctuation
+
+ # PDF Hex string - can contain whitespace and span multiple lines.
+ # This rule must be after "<<"/">>"
+ rule %r/<[0-9A-Fa-f\s]*>/m, Str::Other
+
+ # PDF literal strings are complex (multi-line, escapes, etc.). Use separate state machine.
+ rule %r/\(/, Str, :stringliteral
+
+ # PDF Name objects - can be empty (i.e., nothing after "/").
+ # No special processing required for 2-digit hex codes that start with "#".
+ rule %r/\/[^\(\)<>\[\]\/%\s]*/, Name::Other
+
+ # PDF objects and stream (no checking of object ID)
+ # Note that object number and generation numbers do not have sign.
+ rule %r/\d+\s\d+\sobj/, Keyword::Declaration
+ rule %r/(endstream|endobj|stream)/, Keyword::Declaration
+
+ # PDF conventional file layout keywords
+ rule %r/(startxref|trailer|xref)/, Keyword::Declaration
+
+ # PDF cross reference section entries (20 bytes including EOL).
+ # Explicit single SPACE separators.
+ rule %r/^\d{10} \d{5} (n|f)\s*$/, Keyword::Namespace
+
+ # PDF Indirect reference (lax, allows zero as the object number).
+ # Requires terminating delimiter lookahead to disambiguate from "RG" operator
+ rule %r/\d+\s\d+\sR(?=[\(\)<>\[\]\/%\s])/, Name::Decorator
+
+ # PDF Real object
+ rule %r/(\-|\+)?([0-9]+\.?|[0-9]*\.[0-9]+|[0-9]+\.[0-9]*)/, Num::Float
+
+ # PDF Integer object
+ rule %r/(\-|\+)?[0-9]+/, Num::Integer
+
+ # A run of non-delimiters is most likely a PDF content stream 
+ # operator (ISO 32000-2:2020, Annex A).
+ rule %r/[^\(\)<>\[\]\/%\s]+/, Operator::Word
+
+ # Whitespace (except inside strings and comments) is ignored = /[ \t\r\n\f\v]/.
+ # Ruby doesn't include NUL as whitespace (vs ISO 32000-2:2020 Table 1)
+ rule %r/\s+/, Text::Whitespace
+ end
+
+ # PDF literal string. See ISO 32000-2:2020 clause 7.3.4.2 and Table 3
+ state :stringliteral do
+ rule %r/\(/, Str, :stringliteral # recursive for internal bracketed strings
+ rule %r/\\\(/, Str::Escape, :stringliteral # recursive for internal escaped bracketed strings
+ rule %r/\)/, Str, :pop!
+ rule %r/\\\)/, Str::Escape, :pop!
+ rule %r/\\([0-7]{3}|n|r|t|b|f|\\)/, Str::Escape
+ rule %r/[^\(\)\\]+/, Str
+ end
+ end
+ end
+end

spec/lexers/pdf_spec.rb

@@ -0,0 +1,29 @@
+# -*- coding: utf-8 -*- #
+# frozen_string_literal: true
+
+describe Rouge::Lexers::Pdf do
+ let(:subject) { Rouge::Lexers::Pdf.new }
+
+ describe 'guessing' do
+ include Support::Guessing
+
+ it 'guesses by filename' do
+ assert_guess :filename => 'foo.pdf'
+ assert_guess :filename => 'foo.fdf'
+ end
+
+ it 'guesses by mimetype' do
+ assert_guess :mimetype => 'application/pdf'
+ assert_guess :mimetype => 'application/fdf'
+ end
+
+ it 'guesses by source' do
+ assert_guess :source => '%PDF-1.6'
+ assert_guess :source => '%PDF-2.0'
+ assert_guess :source => '%PDF-0.3' # Fake PDF version
+ assert_guess :source => '%PDF-6.8' # Fake PDF version
+ assert_guess :source => '%FDF-1.2'
+ end
+ end
+
+end

spec/visual/samples/pdf

@@ -0,0 +1,58 @@
+%PDF-1.7
+%©©
+1 0 obj
+<</Type/Catalog/MarkInfo<<%comment after dictionary start
+/Marked true/Suspects true%comment after a boolean
+/UserProperties true>>/StructTreeRoot null/AA<</WP<</S/JavaScript/JS(//JavaScript comment
+app.alert\( "Document Will-Print Action!!"\))>>>>/Pages 3 0 R>>%comment after dictionary close
+endobj
+2 0 obj
+null%comment after null
+endobj
+3 0 obj
+<</FakeBigDataArray[true[[[]]]true<686931>null<686932>null[/Dummy](hi3)[(hi4)(hi5)true(hi6)null(hi7)12(hi8)]-1.<</ABC +.123/DEF +.0>>[](hi99)[]null[]<</DEF null>>true<</GHI/JKL>>[<</MNO +.0>>]<686933>1 0 R[.1 -2 +.3]6 0 R<686934>4 0 R(hi9)2 0 R<</QRS true>>[true]<</TUV true>><686935><</XYZ true>>3 0 R<</AAB true>>(hi10)<</AAC true>>null<686936>true(hi11)<686937>(hi12)+.0<686938>]
+/Type/Pages/Count 1/Kids[4 0 R%comment after indirect ref
+]>>endobj
+4 0 obj
+<</Type/Page/Parent 3 0 R/MediaBox[%comment after array start 
++0 .0 999 999.]%comment after array end token
+/CropBox[+0 .0 999%comment after an integer
+999.]/Contents[5 0 R]/UserUnit +0.88
+/Resources<</Pattern<<>>/ProcSet[null]/ExtGState<</ 6 0 R>>/Font<</F1<</Type/Font/Subtype/Type1/BaseFont/Times-Bold/Encoding/WinAnsiEncoding>>>>>>>>
+endobj
+5 0 obj
+<</Length 757 >>
+stream
+BX /BreakMyParser <</FakeBigDataArray[true[[[]]]true<686931>null<686932>null[/Dummy](hi3)[(hi4)(hi5)true(hi6)null(hi7)12(hi8)]-1.<</ABC +.123/DEF +.0>>[](hi99)[]null[]<</DEF null>>true<</GHI/JKL>>[<</MNO +.0>>]<686933>[1 2 3]<686934>(hi9)<</QRS true>>[true]<</TUV true>><686935><</XYZ true>><</AAB true>>(hi10)<</AAC true>>null<686936>true(hi11)<686937>(hi12)+.0<686938>]>> DP EX
+BT/F1 30 Tf 0 Tr 1 0 0 1 10 950 Tm(PDF Ruby Rouge test file)Tj 1 0 0 1 10 900 Tm 
+(This file must NOT be resaved or modified by any tool!!)Tj ET% 3 colored vector graphic squares that are clipped
+/ gs q 40 w 75 75 400 400 re W S % stroke then clip a path with a wide black border
+1 0. .0 rg 75 75 200 200 re f 0 1 0 rg 275 75 200 200 re f .0 0 1 rg 275 275 200 200 re f Q
+endstream
+endobj
+6 0 obj<</Type/ExtGState/ca 0.33/CA 0.66%comment after a real
+>>
+endobj
+7 0 obj
+<</Subject(Compacted Syntax v3.0)%comment after literal string end
+/Title<436f6d7061637465642073796e746178>%comment after hex string end
+/Keywords(PDF,Compacted,Syntax,ISO 32000-2:2020)/CreationDate(D:20200317)/Author(Peter Wyatt)/Creator< 48616e
+642d65646974>/Producer<48616e 6 4 2 d 6 5646974>>>
+endobj
+xref
+0 8
+0000000000 65535 f
+0000000017 00000 n
+0000000332 00000 n
+0000000374 00000 n
+0000000837 00000 n
+0000001198 00000 n
+0000002009 00000 n
+0000002084 00000 n
+trailer
+<</Root 1 0 R/Info%comment after name
+7 0 R/ID[<18D6B6412
+45C033A6E67D93AD879D6EC><18D 6B 641245C033A6E67D93AD879D6EC>]/Size 8>>
+startxref
+ 2403
+%%EOF