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Edit File : color.rb \| Size : 7.74 KB
# frozen_string_literal: true require 'reline' require 'ripper' require 'irb/ruby-lex' module IRB # :nodoc: module Color CLEAR = 0 BOLD = 1 UNDERLINE = 4 REVERSE = 7 RED = 31 GREEN = 32 YELLOW = 33 BLUE = 34 MAGENTA = 35 CYAN = 36 TOKEN_KEYWORDS = { on_kw: ['nil', 'self', 'true', 'false', '__FILE__', '__LINE__'], on_const: ['ENV'], } private_constant :TOKEN_KEYWORDS # A constant of all-bit 1 to match any Ripper's state in #dispatch_seq ALL = -1 private_constant :ALL begin # Following pry's colors where possible, but sometimes having a compromise like making # backtick and regexp as red (string's color, because they're sharing tokens). TOKEN_SEQ_EXPRS = { on_CHAR: [[BLUE, BOLD], ALL], on_backtick: [[RED, BOLD], ALL], on_comment: [[BLUE, BOLD], ALL], on_const: [[BLUE, BOLD, UNDERLINE], ALL], on_embexpr_beg: [[RED], ALL], on_embexpr_end: [[RED], ALL], on_embvar: [[RED], ALL], on_float: [[MAGENTA, BOLD], ALL], on_gvar: [[GREEN, BOLD], ALL], on_heredoc_beg: [[RED], ALL], on_heredoc_end: [[RED], ALL], on_ident: [[BLUE, BOLD], Ripper::EXPR_ENDFN], on_imaginary: [[BLUE, BOLD], ALL], on_int: [[BLUE, BOLD], ALL], on_kw: [[GREEN], ALL], on_label: [[MAGENTA], ALL], on_label_end: [[RED, BOLD], ALL], on_qsymbols_beg: [[RED, BOLD], ALL], on_qwords_beg: [[RED, BOLD], ALL], on_rational: [[BLUE, BOLD], ALL], on_regexp_beg: [[RED, BOLD], ALL], on_regexp_end: [[RED, BOLD], ALL], on_symbeg: [[YELLOW], ALL], on_symbols_beg: [[RED, BOLD], ALL], on_tstring_beg: [[RED, BOLD], ALL], on_tstring_content: [[RED], ALL], on_tstring_end: [[RED, BOLD], ALL], on_words_beg: [[RED, BOLD], ALL], on_parse_error: [[RED, REVERSE], ALL], compile_error: [[RED, REVERSE], ALL], } rescue NameError # Give up highlighting Ripper-incompatible older Ruby TOKEN_SEQ_EXPRS = {} end private_constant :TOKEN_SEQ_EXPRS class << self def colorable? $stdout.tty? && supported? && (/mswin\|mingw/ =~ RUBY_PLATFORM \|\| (ENV.key?('TERM') && ENV['TERM'] != 'dumb')) end def inspect_colorable?(obj, seen: {}.compare_by_identity) case obj when String, Symbol, Regexp, Integer, Float, FalseClass, TrueClass, NilClass true when Hash without_circular_ref(obj, seen: seen) do obj.all? { \|k, v\| inspect_colorable?(k, seen: seen) && inspect_colorable?(v, seen: seen) } end when Array without_circular_ref(obj, seen: seen) do obj.all? { \|o\| inspect_colorable?(o, seen: seen) } end when Range inspect_colorable?(obj.begin, seen: seen) && inspect_colorable?(obj.end, seen: seen) when Module !obj.name.nil? else false end end def clear return '' unless colorable? "\e[#{CLEAR}m" end def colorize(text, seq) return text unless colorable? seq = seq.map { \|s\| "\e[#{const_get(s)}m" }.join('') "#{seq}#{text}#{clear}" end # If `complete` is false (code is incomplete), this does not warn compile_error. # This option is needed to avoid warning a user when the compile_error is happening # because the input is not wrong but just incomplete. def colorize_code(code, complete: true) return code unless colorable? symbol_state = SymbolState.new colored = +'' length = 0 scan(code, allow_last_error: !complete) do \|token, str, expr\| in_symbol = symbol_state.scan_token(token) str.each_line do \|line\| line = Reline::Unicode.escape_for_print(line) if seq = dispatch_seq(token, expr, line, in_symbol: in_symbol) colored << seq.map { \|s\| "\e[#{s}m" }.join('') colored << line.sub(/\Z/, clear) else colored << line end end length += str.bytesize end # give up colorizing incomplete Ripper tokens if length != code.bytesize return Reline::Unicode.escape_for_print(code) end colored end private def without_circular_ref(obj, seen:, &block) return false if seen.key?(obj) seen[obj] = true block.call ensure seen.delete(obj) end def supported? return @supported if defined?(@supported) @supported = Ripper::Lexer::Elem.method_defined?(:state) end def scan(code, allow_last_error:) pos = [1, 0] verbose, $VERBOSE = $VERBOSE, nil RubyLex.compile_with_errors_suppressed(code) do \|inner_code, line_no\| lexer = Ripper::Lexer.new(inner_code, '(ripper)', line_no) if lexer.respond_to?(:scan) # Ruby 2.7+ lexer.scan.each do \|elem\| str = elem.tok next if allow_last_error and /meets end of file\|unexpected end-of-input/ =~ elem.message next if ([elem.pos[0], elem.pos[1] + str.bytesize] <=> pos) <= 0 str.each_line do \|line\| if line.end_with?("\n") pos[0] += 1 pos[1] = 0 else pos[1] += line.bytesize end end yield(elem.event, str, elem.state) end else lexer.parse.each do \|elem\| yield(elem.event, elem.tok, elem.state) end end end $VERBOSE = verbose end def dispatch_seq(token, expr, str, in_symbol:) if token == :on_parse_error or token == :compile_error TOKEN_SEQ_EXPRS[token][0] elsif in_symbol [YELLOW] elsif TOKEN_KEYWORDS.fetch(token, []).include?(str) [CYAN, BOLD] elsif (seq, exprs = TOKEN_SEQ_EXPRS[token]; (expr & (exprs \|\| 0)) != 0) seq else nil end end end # A class to manage a state to know whether the current token is for Symbol or not. class SymbolState def initialize # Push `true` to detect Symbol. `false` to increase the nest level for non-Symbol. @stack = [] end # Return true if the token is a part of Symbol. def scan_token(token) prev_state = @stack.last case token when :on_symbeg, :on_symbols_beg, :on_qsymbols_beg @stack << true when :on_ident, :on_op, :on_const, :on_ivar, :on_cvar, :on_gvar, :on_kw if @stack.last # Pop only when it's Symbol @stack.pop return prev_state end when :on_tstring_beg @stack << false when :on_embexpr_beg @stack << false return prev_state when :on_tstring_end # :on_tstring_end may close Symbol @stack.pop return prev_state when :on_embexpr_end @stack.pop end @stack.last end end private_constant :SymbolState end end Back

Edit File : color.rb | Size : 7.74 KB

# frozen_string_literal: true
require 'reline'
require 'ripper'
require 'irb/ruby-lex'

module IRB # :nodoc:
  module Color
    CLEAR     = 0
    BOLD      = 1
    UNDERLINE = 4
    REVERSE   = 7
    RED       = 31
    GREEN     = 32
    YELLOW    = 33
    BLUE      = 34
    MAGENTA   = 35
    CYAN      = 36

TOKEN_KEYWORDS = {
      on_kw: ['nil', 'self', 'true', 'false', '__FILE__', '__LINE__'],
      on_const: ['ENV'],
    }
    private_constant :TOKEN_KEYWORDS

# A constant of all-bit 1 to match any Ripper's state in #dispatch_seq
    ALL = -1
    private_constant :ALL

begin
      # Following pry's colors where possible, but sometimes having a compromise like making
      # backtick and regexp as red (string's color, because they're sharing tokens).
      TOKEN_SEQ_EXPRS = {
        on_CHAR:            [[BLUE, BOLD],            ALL],
        on_backtick:        [[RED, BOLD],             ALL],
        on_comment:         [[BLUE, BOLD],            ALL],
        on_const:           [[BLUE, BOLD, UNDERLINE], ALL],
        on_embexpr_beg:     [[RED],                   ALL],
        on_embexpr_end:     [[RED],                   ALL],
        on_embvar:          [[RED],                   ALL],
        on_float:           [[MAGENTA, BOLD],         ALL],
        on_gvar:            [[GREEN, BOLD],           ALL],
        on_heredoc_beg:     [[RED],                   ALL],
        on_heredoc_end:     [[RED],                   ALL],
        on_ident:           [[BLUE, BOLD],            Ripper::EXPR_ENDFN],
        on_imaginary:       [[BLUE, BOLD],            ALL],
        on_int:             [[BLUE, BOLD],            ALL],
        on_kw:              [[GREEN],                 ALL],
        on_label:           [[MAGENTA],               ALL],
        on_label_end:       [[RED, BOLD],             ALL],
        on_qsymbols_beg:    [[RED, BOLD],             ALL],
        on_qwords_beg:      [[RED, BOLD],             ALL],
        on_rational:        [[BLUE, BOLD],            ALL],
        on_regexp_beg:      [[RED, BOLD],             ALL],
        on_regexp_end:      [[RED, BOLD],             ALL],
        on_symbeg:          [[YELLOW],                ALL],
        on_symbols_beg:     [[RED, BOLD],             ALL],
        on_tstring_beg:     [[RED, BOLD],             ALL],
        on_tstring_content: [[RED],                   ALL],
        on_tstring_end:     [[RED, BOLD],             ALL],
        on_words_beg:       [[RED, BOLD],             ALL],
        on_parse_error:     [[RED, REVERSE],          ALL],
        compile_error:      [[RED, REVERSE],          ALL],
      }
    rescue NameError
      # Give up highlighting Ripper-incompatible older Ruby
      TOKEN_SEQ_EXPRS = {}
    end
    private_constant :TOKEN_SEQ_EXPRS

class << self
      def colorable?
        $stdout.tty? && supported? && (/mswin|mingw/ =~ RUBY_PLATFORM || (ENV.key?('TERM') && ENV['TERM'] != 'dumb'))
      end

def inspect_colorable?(obj, seen: {}.compare_by_identity)
        case obj
        when String, Symbol, Regexp, Integer, Float, FalseClass, TrueClass, NilClass
          true
        when Hash
          without_circular_ref(obj, seen: seen) do
            obj.all? { |k, v| inspect_colorable?(k, seen: seen) && inspect_colorable?(v, seen: seen) }
          end
        when Array
          without_circular_ref(obj, seen: seen) do
            obj.all? { |o| inspect_colorable?(o, seen: seen) }
          end
        when Range
          inspect_colorable?(obj.begin, seen: seen) && inspect_colorable?(obj.end, seen: seen)
        when Module
          !obj.name.nil?
        else
          false
        end
      end

def clear
        return '' unless colorable?
        "\e[#{CLEAR}m"
      end

def colorize(text, seq)
        return text unless colorable?
        seq = seq.map { |s| "\e[#{const_get(s)}m" }.join('')
        "#{seq}#{text}#{clear}"
      end

# If `complete` is false (code is incomplete), this does not warn compile_error.
      # This option is needed to avoid warning a user when the compile_error is happening
      # because the input is not wrong but just incomplete.
      def colorize_code(code, complete: true)
        return code unless colorable?

symbol_state = SymbolState.new
        colored = +''
        length = 0

scan(code, allow_last_error: !complete) do |token, str, expr|
          in_symbol = symbol_state.scan_token(token)
          str.each_line do |line|
            line = Reline::Unicode.escape_for_print(line)
            if seq = dispatch_seq(token, expr, line, in_symbol: in_symbol)
              colored << seq.map { |s| "\e[#{s}m" }.join('')
              colored << line.sub(/\Z/, clear)
            else
              colored << line
            end
          end
          length += str.bytesize
        end

# give up colorizing incomplete Ripper tokens
        if length != code.bytesize
          return Reline::Unicode.escape_for_print(code)
        end

colored
      end

private

def without_circular_ref(obj, seen:, &block)
        return false if seen.key?(obj)
        seen[obj] = true
        block.call
      ensure
        seen.delete(obj)
      end

def supported?
        return @supported if defined?(@supported)
        @supported = Ripper::Lexer::Elem.method_defined?(:state)
      end

def scan(code, allow_last_error:)
        pos = [1, 0]

verbose, $VERBOSE = $VERBOSE, nil
        RubyLex.compile_with_errors_suppressed(code) do |inner_code, line_no|
          lexer = Ripper::Lexer.new(inner_code, '(ripper)', line_no)
          if lexer.respond_to?(:scan) # Ruby 2.7+
            lexer.scan.each do |elem|
              str = elem.tok
              next if allow_last_error and /meets end of file|unexpected end-of-input/ =~ elem.message
              next if ([elem.pos[0], elem.pos[1] + str.bytesize] <=> pos) <= 0

str.each_line do |line|
                if line.end_with?("\n")
                  pos[0] += 1
                  pos[1] = 0
                else
                  pos[1] += line.bytesize
                end
              end

yield(elem.event, str, elem.state)
            end
          else
            lexer.parse.each do |elem|
              yield(elem.event, elem.tok, elem.state)
            end
          end
        end
        $VERBOSE = verbose
      end

def dispatch_seq(token, expr, str, in_symbol:)
        if token == :on_parse_error or token == :compile_error
          TOKEN_SEQ_EXPRS[token][0]
        elsif in_symbol
          [YELLOW]
        elsif TOKEN_KEYWORDS.fetch(token, []).include?(str)
          [CYAN, BOLD]
        elsif (seq, exprs = TOKEN_SEQ_EXPRS[token]; (expr & (exprs || 0)) != 0)
          seq
        else
          nil
        end
      end
    end

# A class to manage a state to know whether the current token is for Symbol or not.
    class SymbolState
      def initialize
        # Push `true` to detect Symbol. `false` to increase the nest level for non-Symbol.
        @stack = []
      end

# Return true if the token is a part of Symbol.
      def scan_token(token)
        prev_state = @stack.last
        case token
        when :on_symbeg, :on_symbols_beg, :on_qsymbols_beg
          @stack << true
        when :on_ident, :on_op, :on_const, :on_ivar, :on_cvar, :on_gvar, :on_kw
          if @stack.last # Pop only when it's Symbol
            @stack.pop
            return prev_state
          end
        when :on_tstring_beg
          @stack << false
        when :on_embexpr_beg
          @stack << false
          return prev_state
        when :on_tstring_end # :on_tstring_end may close Symbol
          @stack.pop
          return prev_state
        when :on_embexpr_end
          @stack.pop
        end
        @stack.last
      end
    end
    private_constant :SymbolState
  end
end

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