/usr/lib/ruby/vendor_ruby/ruby_lexer.rex is in ruby-parser 3.6.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 | # encoding: UTF-8
#
# lexical scanner definition for ruby
class RubyLexer
macro
IDENT /^#{IDENT_CHAR}+/o
ESC /\\((?>[0-7]{1,3}|x[0-9a-fA-F]{1,2}|M-[^\\]|(C-|c)[^\\]|u[0-9a-fA-F]+|u\{[0-9a-fA-F]+\}|[^0-7xMCc]))/
SIMPLE_STRING /(#{ESC}|\#(#{ESC}|[^\{\#\@\$\"\\])|[^\"\\\#])*/o
SSTRING /(\\.|[^\'])*/
INT_DEC /[+]?(?:(?:[1-9][\d_]*|0)(?!\.\d)\b|0d[0-9_]+)/i
INT_HEX /[+]?0x[a-f0-9_]+/i
INT_BIN /[+]?0b[01_]+/i
INT_OCT /[+]?0o?[0-7_]+|0o/i
FLOAT /[+]?\d[\d_]*\.[\d_]+(e[+-]?[\d_]+)?\b|[+]?[\d_]+e[+-]?[\d_]+\b/i
INT_DEC2 /[+]?\d[0-9_]*(?![e])/i
NUM_BAD /[+]?0[xbd]\b/i
INT_OCT_BAD /[+]?0o?[0-7_]*[89]/i
FLOAT_BAD /[+]?\d[\d_]*_(e|\.)/i
start
return process_string if lex_strterm
self.command_state = self.command_start
self.command_start = false
self.space_seen = false
self.last_state = lex_state
rule
# [:state] pattern [actions]
# \s - \n + \v
/[\ \t\r\f\v]/ { self.space_seen = true; next }
/\n|\#/ process_newline_or_comment
/[\]\)\}]/ process_bracing
: /\!/
| in_arg_state? /\!\@/ { result :expr_arg, :tUBANG, "!@" }
| /\![=~]?/ { result :arg_state, TOKENS[text], text }
: /\./
| /\.\.\.?/ { result :expr_beg, TOKENS[text], text }
| /\.\d/ { rb_compile_error "no .<digit> floating literal anymore put 0 before dot" }
| /\./ { result :expr_dot, :tDOT, "." }
/\(/ process_paren
/\,/ { result :expr_beg, TOKENS[text], text }
: /=/
| /\=\=\=|\=\=|\=~|\=>|\=(?!begin\b)/ { result arg_state, TOKENS[text], text }
| bol? /\=begin(?=\s)/ process_begin
| /\=(?=begin\b)/ { result arg_state, TOKENS[text], text }
/\"(#{SIMPLE_STRING})\"/o { result :expr_end, :tSTRING, text[1..-2].gsub(ESC) { unescape $1 } }
/\"/ { string STR_DQUOTE; result nil, :tSTRING_BEG, text }
/\@\@?\d/ { rb_compile_error "`#{text}` is not allowed as a variable name" }
/\@\@?#{IDENT_CHAR}+/o process_ivar
: /:/
| not_end? /:([a-zA-Z_]#{IDENT_CHAR}*(?:[?]|[!](?!=)|=(?==>)|=(?![=>]))?)/o process_symbol
| not_end? /\:\"(#{SIMPLE_STRING})\"/o process_symbol
| not_end? /\:\'(#{SSTRING})\'/o process_symbol
| /\:\:/ process_colon2
| /\:/ process_colon1
/->/ { result :expr_endfn, :tLAMBDA, nil }
/[+-]/ process_plus_minus
: /[+\d]/
| /#{NUM_BAD}/o { rb_compile_error "Invalid numeric format" }
| /#{INT_DEC}/o { int_with_base 10 }
| /#{INT_HEX}/o { int_with_base 16 }
| /#{INT_BIN}/o { int_with_base 2 }
| /#{INT_OCT_BAD}/o { rb_compile_error "Illegal octal digit." }
| /#{INT_OCT}/o { int_with_base 8 }
| /#{FLOAT_BAD}/o { rb_compile_error "Trailing '_' in number." }
| /#{FLOAT}/o process_float
| /#{INT_DEC2}/o { int_with_base 10 }
| /[0-9]/ { rb_compile_error "Bad number format" }
/\[/ process_square_bracket
/\'#{SSTRING}\'/o { result :expr_end, :tSTRING, matched[1..-2].gsub(/\\\\/, "\\").gsub(/\\'/, "'") } # " stupid emacs
: /\|/
| /\|\|\=/ { result :expr_beg, :tOP_ASGN, "||" }
| /\|\|/ { result :expr_beg, :tOROP, "||" }
| /\|\=/ { result :expr_beg, :tOP_ASGN, "|" }
| /\|/ { result :arg_state, :tPIPE, "|" }
/\{/ process_curly_brace
: /\*/
| /\*\*=/ { result :expr_beg, :tOP_ASGN, "**" }
| /\*\*/ { result(:arg_state, space_vs_beginning(:tDSTAR, :tDSTAR, :tPOW), "**") }
| /\*\=/ { result(:expr_beg, :tOP_ASGN, "*") }
| /\*/ { result(:arg_state, space_vs_beginning(:tSTAR, :tSTAR, :tSTAR2), "*") }
: /</
| /\<\=\>/ { result :arg_state, :tCMP, "<=>" }
| /\<\=/ { result :arg_state, :tLEQ, "<=" }
| /\<\<\=/ { result :arg_state, :tOP_ASGN, "<<" }
| /\<\</ process_lchevron
| /\</ { result :arg_state, :tLT, "<" }
: />/
| /\>\=/ { result :arg_state, :tGEQ, ">=" }
| /\>\>=/ { result :arg_state, :tOP_ASGN, ">>" }
| /\>\>/ { result :arg_state, :tRSHFT, ">>" }
| /\>/ { result :arg_state, :tGT, ">" }
: /\`/
| expr_fname? /\`/ { result(:expr_end, :tBACK_REF2, "`") }
| expr_dot? /\`/ { result((command_state ? :expr_cmdarg : :expr_arg), :tBACK_REF2, "`") }
| /\`/ { string STR_XQUOTE, '`'; result(nil, :tXSTRING_BEG, "`") }
/\?/ process_questionmark
: /&/
| /\&\&\=/ { result(:expr_beg, :tOP_ASGN, "&&") }
| /\&\&/ { result(:expr_beg, :tANDOP, "&&") }
| /\&\=/ { result(:expr_beg, :tOP_ASGN, "&" ) }
| /\&/ process_amper
/\// process_slash
: /\^/
| /\^=/ { result(:expr_beg, :tOP_ASGN, "^") }
| /\^/ { result(:arg_state, :tCARET, "^") }
/\;/ { self.command_start = true; result(:expr_beg, :tSEMI, ";") }
: /~/
| in_arg_state? /\~@/ { result(:arg_state, :tTILDE, "~") }
| /\~/ { result(:arg_state, :tTILDE, "~") }
: /\\/
| /\\\r?\n/ { self.lineno += 1; self.space_seen = true; next }
| /\\/ { rb_compile_error "bare backslash only allowed before newline" }
/\%/ process_percent
: /\$/
| /\$_\w+/ process_gvar
| /\$_/ process_gvar
| /\$[~*$?!@\/\\;,.=:<>\"]|\$-\w?/ process_gvar
| in_fname? /\$([\&\`\'\+])/ process_gvar
| /\$([\&\`\'\+])/ process_backref
| in_fname? /\$([1-9]\d*)/ process_gvar
| /\$([1-9]\d*)/ process_nthref
| /\$0/ process_gvar
| /\$\W|\$\z/ process_gvar_oddity
| /\$\w+/ process_gvar
/\_/ process_underscore
/#{IDENT}/o process_token
/\004|\032|\000|\Z/ { [RubyLexer::EOF, RubyLexer::EOF] }
/./ { rb_compile_error "Invalid char #{text.inspect} in expression" }
end
|