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# encoding: UTF-8
#
# lexical scanner definition for ruby
class RubyLexer
option
lineno
column
macro
IDENT_CHAR /[a-zA-Z0-9_[:^ascii:]]/
ESC /\\((?>[0-7]{1,3}|x\h{1,2}|M-[^\\]|(C-|c)[^\\]|u\h{1,4}|u\{\h+(?:\s+\h+)*\}|[^0-7xMCc]))/
SIMPLE_STRING /((#{ESC}|\#(#{ESC}|[^\{\#\@\$\"\\])|[^\"\\\#])*)/o
SSTRING /((\\.|[^\'])*)/
INT_DEC /[+]?(?:(?:[1-9][\d_]*|0)(?!\.\d)(ri|r|i)?\b|0d[0-9_]+)(ri|r|i)?/i
INT_HEX /[+]?0x[a-f0-9_]+(ri|r|i)?/i
INT_BIN /[+]?0b[01_]+(ri|r|i)?/i
INT_OCT /[+]?0o?[0-7_]+(ri|r|i)?|0o(ri|r|i)?/i
FLOAT /[+]?\d[\d_]*\.[\d_]+(e[+-]?[\d_]+)?(?:(ri|r|i)\b)?|[+]?[\d_]+e[+-]?[\d_]+(?:(ri|r|i)\b)?/i
INT_DEC2 /[+]?\d[0-9_]*(?![e])((ri|r|i)\b)?/i
NUM_BAD /[+]?0[xbd]\b/i
INT_OCT_BAD /[+]?0o?[0-7_]*[89]/i
FLOAT_BAD /[+]?\d[\d_]*_(e|\.)/i
start
maybe_pop_stack
return process_string_or_heredoc if lex_strterm
self.cmd_state = self.command_start
self.command_start = false
self.space_seen = false # TODO: rename token_seen?
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_brace_close
: /\!/
| is_after_operator? /\!\@/ { result EXPR_ARG, TOKENS[text], text }
| /\![=~]?/ { result :arg_state, TOKENS[text], text }
: /\./
| /\.\.\.?/ process_dots
| /\.\d/ { rb_compile_error "no .<digit> floating literal anymore put 0 before dot" }
| /\./ { self.lex_state = EXPR_BEG; result EXPR_DOT, :tDOT, "." }
/\(/ process_paren
/\,/ { result EXPR_PAR, TOKENS[text], text }
: /=/
| /\=\=\=|\=\=|\=~|\=>|\=(?!begin\b)/ { result arg_state, TOKENS[text], text }
| bol? /\=begin(?=\s)/ process_begin
| /\=(?=begin\b)/ { result arg_state, TOKENS[text], text }
ruby22_label? /\"#{SIMPLE_STRING}\":/o process_label
/\"(#{SIMPLE_STRING})\"/o process_simple_string
/\"/ { 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, text }
/[+-]/ 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
was_label? /\'#{SSTRING}\':?/o process_label_or_string
/\'/ { string STR_SQUOTE, "'"; result nil, :tSTRING_BEG, text }
: /\|/
| /\|\|\=/ { result EXPR_BEG, :tOP_ASGN, "||" }
| /\|\|/ { result EXPR_BEG, :tOROP, "||" }
| /\|\=/ { result EXPR_BEG, :tOP_ASGN, "|" }
| /\|/ { state = is_after_operator? ? EXPR_ARG : EXPR_PAR; result state, :tPIPE, "|" }
/\{/ process_brace_open
: /\*/
| /\*\*=/ { 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), "*" }
# TODO: fix result+process_lchevron to set command_start = true
: /</
| /\<\=\>/ { result :arg_state, :tCMP, "<=>" }
| /\<\=/ { result :arg_state, :tLEQ, "<=" }
| /\<\<\=/ { result EXPR_BEG, :tOP_ASGN, "<<" }
| /\<\</ process_lchevron
| /\</ { result :arg_state, :tLT, "<" }
: />/
| /\>\=/ { result :arg_state, :tGEQ, ">=" }
| /\>\>=/ { result EXPR_BEG, :tOP_ASGN, ">>" }
| /\>\>/ { result :arg_state, :tRSHFT, ">>" }
| /\>/ { result :arg_state, :tGT, ">" }
: /\`/
| expr_fname? /\`/ { result EXPR_END, :tBACK_REF2, "`" }
| expr_dot? /\`/ { result((cmd_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, "&" }
| /\&\./ { result EXPR_DOT, :tLONELY, "&." }
| /\&/ process_amper
/\// process_slash
: /\^/
| /\^=/ { result EXPR_BEG, :tOP_ASGN, "^" }
| /\^/ { result :arg_state, :tCARET, "^" }
/\;/ { self.command_start = true; result EXPR_BEG, :tSEMI, ";" }
: /~/
| is_after_operator? /\~@/ { 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
| /\$#{IDENT_CHAR}+/ process_gvar
| /\$\W/ process_gvar_oddity
/\_/ process_underscore
/#{IDENT_CHAR}+/o process_token
/\004|\032|\000|\Z/ { [RubyLexer::EOF, RubyLexer::EOF] }
/./ { rb_compile_error "Invalid char #{text.inspect} in expression" }
end
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