Class: CDDL::Parser
Defined Under Namespace
Classes: BackTrack
Constant Summary collapse
- REGEXP_FOR_STRING =
Memoize a bit here
Hash.new {|h, k| h[k] = Regexp.new("\\A#{k}\\z") }
- VALUE_TYPE =
{text: String, int: Integer, float: Float}
- SIMPLE_VALUE =
{ [:prim, 7, 20] => [true, false, :bool], [:prim, 7, 21] => [true, true, :bool], [:prim, 7, 22] => [true, nil, :nil], [:prim, 7, 23] => [true, :undefined, :undefined], }
- OPERATORS =
{lt: :<, le: :<=, gt: :>, ge: :>=, eq: :==, ne: :!=}
Instance Attribute Summary collapse
-
#ast ⇒ Object
readonly
Returns the value of attribute ast.
Instance Method Summary collapse
-
#apr ⇒ Object
for debugging.
- #ast_debug ⇒ Object
- #cname(s) ⇒ Object
-
#defines(prefix) ⇒ Object
Generate some simple #define lines from the value-only rules.
- #extract_value(t) ⇒ Object
- #generate ⇒ Object
- #generate1(where, inmap = false) ⇒ Object
-
#initialize(source_text) ⇒ Parser
constructor
A new instance of Parser.
- #lookup_recurse_grpent(name) ⇒ Object
- #map_check(d, d_check, members) ⇒ Object
- #rules ⇒ Object
- #strip_nodes(n) ⇒ Object
- #validate(d, warn = true) ⇒ Object
- #validate1(d, where) ⇒ Object
- #validate1a(d, where) ⇒ Object
- #validate_diag ⇒ Object
- #validate_forward(d, start, where) ⇒ Object
-
#validate_linear(d, start, where) ⇒ Object
returns number of matches or false for breakage.
- #validate_result(check) ⇒ Object
- #walk(rule, anno = nil, &block) ⇒ Object
Constructor Details
#initialize(source_text) ⇒ Parser
Returns a new instance of Parser.
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# File 'lib/cddl.rb', line 26 def initialize(source_text) @abnf = Peggy::ABNF.new _cresult = @abnf.compile! ABNF_SPEC, ignore: :s presult = @abnf.parse? :cddl, (source_text + PRELUDE) expected_length = source_text.length + PRELUDE.length if expected_length != presult upto = @abnf.parse_results.keys.max puts "UPTO: #{upto}" if $advanced pp @abnf.parse_results[upto] if $advanced pp @abnf.parse_results[presult] if $advanced puts "SO FAR: #{presult}" if $advanced puts @abnf.ast? if $advanced presult ||= 0 part1 = source_text[[presult - 100, 0].max...presult] part3 = source_text[upto...[upto + 100, source_text.length].min] if upto - presult < 100 part2 = source_text[presult...upto] else part2 = source_text[presult, 50] + "......." + source_text[upto-50, 50] end warn "*** Look for syntax problems around the #{ "%%%".colorize(background: :light_yellow)} markers:\n#{ part1}#{"%%%".colorize(color: :green, background: :light_yellow)}#{ part2}#{"%%%".colorize(color: :red, background: :light_yellow)}#{ part3}" raise ParseError, "*** Parse error at #{presult} upto #{upto} of #{ source_text.length} (#{expected_length})." end puts @abnf.ast? if $debug_ast @ast = @abnf.ast? # our little argument stack for rule processing @insides = [] end |
Instance Attribute Details
#ast ⇒ Object (readonly)
Returns the value of attribute ast.
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# File 'lib/cddl.rb', line 873 def ast @ast end |
Instance Method Details
#apr ⇒ Object
for debugging
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# File 'lib/cddl.rb', line 60 def apr # for debugging @abnf.parse_results end |
#ast_debug ⇒ Object
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# File 'lib/cddl.rb', line 64 def ast_debug ast.to_s[/.*comment/m] # stop at first comment -- prelude end |
#cname(s) ⇒ Object
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# File 'lib/cddl.rb', line 99 def cname(s) s.to_s.gsub(/-/, "_") end |
#defines(prefix) ⇒ Object
Generate some simple #define lines from the value-only rules
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# File 'lib/cddl.rb', line 104 def defines(prefix) prefix ||= "CDDL" if prefix =~ /%\d*\$?s/ format = prefix format += "\n" unless format[-1] == "\n" else format = "#define #{prefix}_%s %s\n" end s = {} # keys form crude set of defines add = proc { |*a| s[format % a] = true } r = rules ast.each :rule do |rule| if rulename = rule.typename t = rule.type.children(:type1) if t.size == 1 if (t2 = t.first.children(:type2)) && t2.size == 1 && (v = t2.first.value) add.(cname(rulename), v.to_s) end end end end # CBOR::PP.pp r walk(r) do |subtree, anno| if subtree[0] == :type1 && subtree[1..-1].all? {|x| x[0] == :int} if enumname = subtree.cbor_annotations rescue nil enumname = cname(enumname.first) subtree[1..-1].each do |x| if memname = x.cbor_annotations memname = "#{enumname}_#{cname(memname.first)}" add.(memname, x[1].to_s) end end end end if subtree[0] == :array if (arrayname = subtree.cbor_annotations rescue nil) || anno arrayname = cname(arrayname ? arrayname.first : anno) subtree[1..-1].each_with_index do |x, i| if x[0] == :member if Array === x[3] && x[3][0] == :text memname = x[3][1] # preferably use key string elsif memname = x[4].cbor_annotations memname = memname.first # use value annotation otherwise end if memname memname = "#{arrayname}_#{cname(memname)}_index" add.(memname, i.to_s) end end if x[0] == :member && (x[1] != 1 || x[2] != 1) break # can't give numbers if we have optionals etc. end end end end end s.keys.join end |
#extract_value(t) ⇒ Object
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# File 'lib/cddl.rb', line 529 def extract_value(t) if vt = VALUE_TYPE[t[0]] [true, t[1], vt] elsif v = SIMPLE_VALUE[t] v else [false] end end |
#generate ⇒ Object
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# File 'lib/cddl.rb', line 252 def generate @recursion = 0 generate1(rules) end |
#generate1(where, inmap = false) ⇒ Object
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# File 'lib/cddl.rb', line 257 def generate1(where, inmap = false) case where[0] when :type1 fail BackTrack.new("Can't generate from empty type choice socket yet") unless where.size > 1 begin chosen = where[rand(where.size-1)+1] generate1(chosen) rescue BackTrack tries = where[1..-1].sample(where.size) - [chosen] r = begin if tries.empty? BackTrack.new("No suitable alternative in type choice") else generate1(tries.pop) end rescue BackTrack retry end fail r if BackTrack === r r end when :grpchoice fail BackTrack.new("Can't generate from empty group choice socket yet") unless where.size > 1 begin chosen = where[rand(where.size-1)+1] chosen.flat_map {|m| generate1(m, inmap)} rescue BackTrack tries = where[1..-1].sample(where.size) - [chosen] r = begin if tries.empty? BackTrack.new("No suitable alternative in group choice") else tries.pop.flat_map {|m| generate1(m, inmap)} end rescue BackTrack retry end fail r if BackTrack === r r end when :map Hash[where[1..-1].flat_map {|m| generate1(m, true)}] when :recurse_grpent name = where[1] rule = lookup_recurse_grpent(name) if @recursion < MAX_RECURSE @recursion += 1 #p ["recurse_grpent", *rule] #r = generate1(rule) r = rule[1..-1].flat_map {|m| generate1(m, inmap)} @recursion -= 1 r else fail "Deep recursion into #{name}: #{@stage1[name]}, not yet implemented" end when :array, :grpent r = where[1..-1].flat_map {|m| generate1(m).map{|e| e[1]}} .flat_map {|e| Array === e && e[0] == :grpent ? e[1..-1] : [e]} # nested grpents need to be "unpacked" if where[0] == :grpent [:grpent, *r] else r end when :member st = where[1] en = [where[2], [st, 4].max].min # truncate to 4 unless must be more st += rand(en + 1 - st) if en != st kr = where[3] vr = where[4] if inmap unless kr case vr[0] when :grpent fail "grpent in map #{vr.inspect}" unless vr.size == 2 g = Array.new(st) { generate1(vr[1], true) }.flatten(1) # warn "GGG #{g.inspect}" return g when :grpchoice g = Array.new(st) { generate1(vr, true) }.flatten(1) # warn "GGG #{g.inspect}" return g else fail "member key not given in map for #{where}" # || vr == [:grpchoice] end end end begin Array.new(st) { [ (generate1(kr) if kr), # XXX: need error in map context generate1(vr) ]} rescue BackTrack fail BackTrack.new("Need #{where[1]}..#{where[2]} of these: #{[kr, vr].inspect}") unless where[1] == 0 [] end when :text, :int, :float, :bytes where[1] when :range rand(where[1]) when :prim case where[1] when nil gen_word # XXX: maybe always returning a string is confusing when 0 rand(4711) when 1 ~rand(815) when 2 gen_word.force_encoding(Encoding::BINARY) when 3 gen_word when 6 CBOR::Tagged.new(where[2], generate1(where[3])) when 7 case where[2] when nil Math::PI when 20 false when 21 true when 22 nil when 23 :undefined when 25, 26, 27 rand() end else fail "Can't generate prim #{where[1]}" end when :anno target = where[2] control = where[3] case where[1] when :size should_be_int = generate1(control) unless (target == [:prim, 2] || target == [:prim, 0]) && Integer === should_be_int && should_be_int >= 0 fail "Don't know yet how to generate #{where}" end s = Random.new.bytes(should_be_int) if target == [:prim, 0] # silently restrict to what we can put into a uint s[0...8].bytes.inject(0) {|a, b| a << 8 | b } else s end when :bits set_of_bits = Array.new(10) { generate1(control) } # XXX: ten? # p set_of_bits unless (target == [:prim, 0] || target == [:prim, 2]) && set_of_bits.all? {|x| Integer === x && x >= 0 } fail "Don't know yet how to generate #{where}" end if target == [:prim, 2] set_of_bits.inject(String.new) do |s, i| n = i >> 3 bit = 1 << (i & 7) if v = s.getbyte(n) s.setbyte(n, v | bit); s else s << "\0" * (n - s.size) << bit.chr(Encoding::BINARY) end end else # target == [:prim, 0] set_of_bits.inject(0) do |a, v| a |= (1 << v) end end when :default # Hmm. unless $default_warned warn "*** Ignoring .default for now." $default_warned = true end generate1(target, inmap) when :eq content = generate1(control) if validate1(content, where) return content end fail "Not smart enough to generate #{where}" when :lt, :le, :gt, :ge, :ne if Array === target && target[0] == :prim content = generate1(control) try = if Numeric === content content = Integer(content) case target[1] when 0 case where[1] when :lt rand(0...content) when :le rand(0..content) end end end if validate1(try, where) return try else warn "HUH gen #{where.inspect} #{try.inspect}" unless try.nil? end end 32.times do content = generate1(target) if validate1(content, where) return content end end fail "Not smart enough to generate #{where}" when :regexp regexp = generate1(control) unless target == [:prim, 3] && String === regexp fail "Don't know yet how to generate #{where}" end REGEXP_FOR_STRING[regexp].random_example(max_repeater_variance: 5) when :cbor, :cborseq unless target == [:prim, 2] fail "Don't know yet how to generate #{where}" end content = CBOR::encode(generate1(control)) if where[1] == :cborseq # remove the first head n = case content.getbyte(0) - (4 << 5) when 0..23; 1 when 24; 2 when 25; 3 when 26; 5 when 27; 9 # unlikely :-) else fail "Generated .cborseq sequence for #{where} not an array" end content[0...n] = '' end content when :within, :and 32.times do content = generate1(target) if validate1(content, control) return content elsif where[1] == :within warn "*** #{content.inspect} meets #{target.inspect} but not #{control.inspect}" end end fail "Not smart enough to generate #{where}" else fail "Don't know yet how to generate from #{where}" end when :recurse name = where[1] rule = @stage1[name] if @recursion < MAX_RECURSE @recursion += 1 #p ["recurse", *rule] r = generate1(rule) @recursion -= 1 r else fail "Deep recursion into #{name}: #{@stage1[name]}, not yet implemented" end else fail "Don't know how to generate from #{where[0]} in #{where.inspect}" end end |
#lookup_recurse_grpent(name) ⇒ Object
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# File 'lib/cddl.rb', line 239 def lookup_recurse_grpent(name) rule = @stage1[name] # pp rule fail unless rule.size == 2 [rule[0], *rule[1]] end |
#map_check(d, d_check, members) ⇒ Object
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# File 'lib/cddl.rb', line 612 def map_check(d, d_check, members) anno = [] anno if members.all? { |r| puts "ALL SUBRULE: #{r.inspect}" if ENV["CDDL_TRACE"] t, s, e, k, v = r case t when :recurse_grpent rule = lookup_recurse_grpent(s) if ann2 = map_check(d, d_check, rule[1..-1]) anno.concat(ann2) end when :grpchoice r[1..-1].any? {|cand| puts "CHOICE SUBRULE: #{cand.inspect}" if ENV["CDDL_TRACE"] cand_d_check = d_check.dup if ann2 = map_check(d, cand_d_check, cand) puts "CHOICE SUBRULE SUCCESS: #{cand.inspect}" if ENV["CDDL_TRACE"] d_check.replace(cand_d_check) anno.concat(ann2) end } when :member unless k case v[0] when :grpent entries = v[1..-1] when :grpchoice entries = [v] else fail "member name not known for group entry #{r} in map" end d_check1 = d_check.dup occ = 0 ann2 = [] while occ < e && (ann3 = map_check(d, d_check1, entries)) && ann3 != [] occ += 1 ann2.concat(ann3) end if occ >= s d_check.replace(d_check1) anno.concat(ann2) puts "OCC SATISFIED: #{occ.inspect} >= #{s.inspect}" if ENV["CDDL_TRACE"] anno else # leave some diagnostic breadcrumbs? puts "OCC UNSATISFIED: #{occ.inspect} < #{s.inspect}" if ENV["CDDL_TRACE"] false end else # this is mostly quadratic; let's do the linear thing if possible simple, simpleval = extract_value(k) if simple # puts "SIMPLE: #{d_check.inspect} #{simpleval}" # add occurrence check; check that val is present in the first place actual = d.fetch(simpleval, :not_found) if actual == :not_found s == 0 # minimum occurrence must be 0 then else if (ann2 = validate1a(actual, v)) && d_check.delete(simpleval) {:not_found} != :not_found anno.concat(ann2) end end else # puts "COMPLEX: #{k.inspect} #{simple.inspect} #{simpleval.inspect}" keys = d_check.keys ta, keys = keys.partition{ |key| validate1(key, k)} # XXX check ta.size against s/e ta.all? { |val| if (ann2 = validate1a(d[val], v)) && d_check.delete(val) {:not_found} != :not_found anno.concat(ann2) end } end end else fail "Cannot validate #{t} in maps yet #{r}" # MMM end } end |
#rules ⇒ Object
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# File 'lib/cddl.rb', line 163 def rules @rules = {} @generics = {} @bindings = [{}] ast.each :rule do |rule| rule_ast = if rulename = rule.groupname [:grpent, rule.grpent] elsif rulename = rule.typename [:type1, *rule.type.children(:type1)] else fail "Huh?" end n = rulename.to_s asg = rule.assign.to_s if g = rule.genericparm if asg != "=" fail "Augment #{asg.inspect} not implemented for generics" end ids = g.children(:id).map(&:to_s) # puts ["ids", ids].inspect if b = @generics[n] fail "Duplicate generics definition #{n} as #{rule_ast} (was #{b})" end @generics[n] = [rule_ast, ids] else case asg when "=" if @rules[n] a = strip_nodes(rule_ast).inspect b = strip_nodes(@rules[n]).inspect if a == b warn "*** Warning: Identical redefinition of #{n} as #{a}" else fail "Duplicate rule definition #{n} as #{b} (was #{a})" end end @rules[n] = rule_ast when "/=" @rules[n] ||= [:type1] fail "Can't add #{rule_ast} to #{n}" unless rule_ast[0] == :type1 # XXX need to check existing rule as well @rules[n].concat rule_ast[1..-1] # puts "#{@rules[n].inspect} /=" when "//=" @rules[n] ||= [:grpchoice] fail "Can't add #{rule_ast} to #{n}" unless rule_ast[0] == :grpent # XXX need to check existing rule as well if @rules[n][0] == :grpent # widen @rules[n] = [:grpchoice, @rules[n]] end @rules[n] << rule_ast # puts "#{@rules[n].inspect} //=" else fail "Unknown assign #{asg.inspect}" end end end # pp @generics @rootrule = @rules.keys.first # DRAFT: generics are ignored here. # now process the rules... @stage1 = {} result = r_process(@rootrule, @rules[@rootrule]) r_process("used_in_cddl_prelude", @rules["used_in_cddl_prelude"]) @rules.each do |n, r| # r_process(n, r) # debug only loop warn "*** Unused rule #{n}" unless @stage1[n] end if result[0] == :grpent warn "Group at top -- first rule must be a type!" end # end # @stage1 result end |
#strip_nodes(n) ⇒ Object
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# File 'lib/cddl.rb', line 68 def strip_nodes(n) [n[0], *n[1..-1].map {|e| e._strip }] end |
#validate(d, warn = true) ⇒ Object
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# File 'lib/cddl.rb', line 543 def validate(d, warn=true) @recursion = 0 result = validate1a(d, rules) unless result if warn warn "CDDL validation failure (#{result.inspect} for #{d.inspect}):" PP::pp(validate_diag, STDERR) end end result end |
#validate1(d, where) ⇒ Object
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# File 'lib/cddl.rb', line 707 def validate1(d, where) if ENV["CDDL_TRACE"] puts "DATA: #{d.inspect}" puts "RULE: #{where.inspect}" end # warn ["val1", d, where].inspect @last_data = d @last_rule = where ann = nil case where[0] when :type1 if where[1..-1].any? {|r| ann = validate1a(d, r)} ann end when :map if Hash === d d_check = d.dup if (ann = map_check(d, d_check, where[1..-1])) && d_check == {} ann else if ENV["CDDL_TRACE"] puts "MAP RESIDUAL: #{d_check.inspect} for #{where[1..-1]} and #{d.inspect}" end end end when :array # warn ["valarr", d, where].inspect if Array === d # validate1 against the record idx, ann = validate_forward(d, 0, where) ann if validate_result(idx == d.size) { "#{validate_diag.inspect} -- cannot complete (#{idx}, #{d.size}) array #{d} for #{where}" } end when :text, :int, :float, :bytes _, v = extract_value(where) [] if d == v when :range [] if where[2] === d && where[1].include?(d) when :anno target = where[2] if ann = validate1a(d, target) control = where[3] case where[1] when :size case d when Integer ok, v, vt = extract_value(control) if ok && vt == Integer ann if (d >> (8*v)) == 0 end when String ann if validate1(d.bytesize, control) end when :bits if String === d d.each_byte.with_index.all? { |b, i| bit = i << 3 ann if 8.times.all? { |nb| b[nb] == 0 || validate1(bit+nb, control) } } elsif Integer === d if d >= 0 ok = true i = 0 while ok && d > 0 if d.odd? ok &&= validate1(i, control) end d >>= 1; i += 1 end ann if ok end end when :default # Hmm. unless $default_warned warn "*** Ignoring .default for now." $default_warned = true end ann when :lt, :le, :gt, :ge, :eq, :ne op = OPERATORS[where[1]] ok, v, _vt = extract_value(control) if ok ann if d.send(op, v) rescue nil # XXX Focus ArgumentError end when :regexp ann if ( if String === d ok, v, vt = extract_value(control) if ok && vt == String re = REGEXP_FOR_STRING[v] # pp re d.match(re) end end ) when :cbor ann if validate1((CBOR::decode(d) rescue :BAD_CBOR), control) when :cborseq ann if validate1((CBOR::decode("\x9f".b << d << "\xff".b) rescue :BAD_CBOR), control) when :within if validate1(d, control) ann else warn "*** #{d.inspect} meets #{target} but not #{control}" nil end when :and ann if validate1(d, control) else fail "Don't know yet how to validate against #{where}" end end when :prim # warn "validate prim WI #{where.inspect} #{d.inspect}" case where[1] when nil true when 0 Integer === d && d >= 0 && d <= 0xffffffffffffffff when 1 Integer === d && d < 0 && d >= -0x10000000000000000 when 2 String === d && d.encoding == Encoding::BINARY when 3 String === d && d.encoding != Encoding::BINARY # cheat when 6 CBOR::Tagged === d && d.tag == where[2] && validate1a(d.data, where[3]) when 7 t, v = extract_value(where) if t v.eql? d else case where[2] when nil # XXX fail when 25, 26, 27 Float === d else fail end end else fail "Can't validate prim #{where[1]} yet" end when :recurse name = where[1] rule = @stage1[name] if @recursion < MAX_RECURSE @recursion += 1 r = validate1a(d, rule) @recursion -= 1 r else fail "Deep recursion into #{name}: #{rule}, not yet implemented" end else @last_message = "Don't know how to validate #{where}" false # fail where end end |
#validate1a(d, where) ⇒ Object
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# File 'lib/cddl.rb', line 694 def validate1a(d, where) if ann = validate1(d, where) here = [d, where] if Array === ann [here, *ann] else [here] end end end |
#validate_diag ⇒ Object
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# File 'lib/cddl.rb', line 539 def validate_diag [@last_data, @last_rule, @last_message] end |
#validate_forward(d, start, where) ⇒ Object
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# File 'lib/cddl.rb', line 562 def validate_forward(d, start, where) # warn ["valforw", d, start, where].inspect i = 0 ann = [] where[1..-1].each { |r| t, s, e, _k, v = r # XXX if t == :recurse_grpent rule = lookup_recurse_grpent(s) n, ann2 = validate_linear(d, start+i, rule) return [false, ann] unless n i += n ann.concat(ann2) elsif t == :grpchoice return [false, ann] unless r[1..-1].any? {|cand| n, ann2 = validate_forward(d, start+i, [:foo, *cand]) if n i += n ann.concat(ann2) end} else fail r.inspect unless t == :member occ = 0 while ((occ < e) && i != d.size && ((n, ann2 = validate_linear(d, start+i, v)); n)) i += n occ += 1 ann.concat(ann2) end if occ < s @last_message = "occur not reached in array #{d} for #{where}" return [false, ann] end end } # warn ["valforw>", i].inspect [i, ann] end |
#validate_linear(d, start, where) ⇒ Object
returns number of matches or false for breakage
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# File 'lib/cddl.rb', line 600 def validate_linear(d, start, where) # warn ["vallin", d, start, where].inspect fail unless Array === d case where[0] when :grpent # must be inside an array with nested occurrences validate_forward(d, start, where) else (ann = validate1a(d[start], where)) ? [1, ann] : [false, ann] end end |
#validate_result(check) ⇒ Object
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# File 'lib/cddl.rb', line 555 def validate_result(check) check || ( @last_message = yield false ) end |
#walk(rule, anno = nil, &block) ⇒ Object
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# File 'lib/cddl.rb', line 74 def walk(rule, anno = nil, &block) r = [] case rule when Array r.concat(Array(yield rule, anno)) case rule[0] when :type1, :array, :map a = (rule.cbor_annotations rescue nil) if rule.size == 2 a = a.first if a r.concat(rule[1..-1].map{|x| walk(x, a, &block)}) when :grpchoice r.concat(rule[1..-1].map{|x| x.flat_map {|y| walk(y, &block)}}) when :member r << walk(rule[3], &block) r << walk(rule[4], &block) when :anno r << walk(rule[2], &block) r << walk(rule[3], &block) else # p ["LEAF", rule[0]] end end r.compact end |