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# frozen_string_literal: false
#
# irb/ruby-lex.rb - ruby lexcal analyzer
# $Release Version: 0.9.6$
# $Revision$
# by Keiju ISHITSUKA(keiju@ruby-lang.org)
#
# --
#
#
#
require "ripper"
require "jruby" if RUBY_ENGINE == "jruby"
# :stopdoc:
class RubyLex
class TerminateLineInput < StandardError
def initialize
super("Terminate Line Input")
end
end
def initialize
@exp_line_no = @line_no = 1
@indent = 0
@continue = false
@line = ""
@prompt = nil
end
def self.compile_with_errors_suppressed(code)
line_no = 1
begin
result = yield code, line_no
rescue ArgumentError
code = ";\n#{code}"
line_no = 0
result = yield code, line_no
end
result
end
# io functions
def set_input(io, p = nil, &block)
@io = io
if @io.respond_to?(:check_termination)
@io.check_termination do |code|
code.gsub!(/\s*\z/, '').concat("\n")
ltype, indent, continue, code_block_open = check_state(code)
if ltype or indent > 0 or continue or code_block_open
false
else
true
end
end
end
if @io.respond_to?(:dynamic_prompt)
@io.dynamic_prompt do |lines|
lines << '' if lines.empty?
result = []
lines.each_index { |i|
c = lines[0..i].map{ |l| l + "\n" }.join
ltype, indent, continue, code_block_open = check_state(c)
result << @prompt.call(ltype, indent, continue || code_block_open, @line_no + i)
}
result
end
end
if p.respond_to?(:call)
@input = p
elsif block_given?
@input = block
else
@input = Proc.new{@io.gets}
end
end
def set_prompt(p = nil, &block)
p = block if block_given?
if p.respond_to?(:call)
@prompt = p
else
@prompt = Proc.new{print p}
end
end
def ripper_lex_without_warning(code)
verbose, $VERBOSE = $VERBOSE, nil
tokens = nil
self.class.compile_with_errors_suppressed(code) do |inner_code, line_no|
tokens = Ripper.lex(inner_code, '-', line_no)
end
$VERBOSE = verbose
tokens
end
def set_auto_indent(context)
if @io.respond_to?(:auto_indent) and context.auto_indent_mode
@io.auto_indent do |lines, line_index, byte_pointer, is_newline|
if is_newline
md = lines[line_index - 1].match(/(\A +)/)
prev_spaces = md.nil? ? 0 : md[1].count(' ')
@tokens = ripper_lex_without_warning(lines[0..line_index].join("\n"))
depth_difference = check_newline_depth_difference
prev_spaces + depth_difference * 2
else
code = line_index.zero? ? '' : lines[0..(line_index - 1)].map{ |l| l + "\n" }.join
last_line = lines[line_index]&.byteslice(0, byte_pointer)
code += last_line if last_line
@tokens = ripper_lex_without_warning(code)
corresponding_token_depth = check_corresponding_token_depth
if corresponding_token_depth
corresponding_token_depth
else
nil
end
end
end
end
end
def check_state(code)
@tokens = ripper_lex_without_warning(code)
ltype = process_literal_type
indent = process_nesting_level
continue = process_continue
code_block_open = check_code_block(code)
[ltype, indent, continue, code_block_open]
end
def prompt
if @prompt
@prompt.call(@ltype, @indent, @continue, @line_no)
end
end
def initialize_input
@ltype = nil
@indent = 0
@continue = false
@line = ""
@exp_line_no = @line_no
@code_block_open = false
end
def each_top_level_statement
initialize_input
catch(:TERM_INPUT) do
loop do
begin
prompt
unless l = lex
throw :TERM_INPUT if @line == ''
else
@line_no += l.count("\n")
next if l == "\n"
@line.concat l
if @code_block_open or @ltype or @continue or @indent > 0
next
end
end
if @line != "\n"
@line.force_encoding(@io.encoding)
yield @line, @exp_line_no
end
break if @io.eof?
@line = ''
@exp_line_no = @line_no
@indent = 0
rescue TerminateLineInput
initialize_input
prompt
end
end
end
end
def lex
line = @input.call
if @io.respond_to?(:check_termination)
return line # multiline
end
code = @line + (line.nil? ? '' : line)
code.gsub!(/\s*\z/, '').concat("\n")
@tokens = ripper_lex_without_warning(code)
@continue = process_continue
@code_block_open = check_code_block(code)
@indent = process_nesting_level
@ltype = process_literal_type
line
end
def process_continue
# last token is always newline
if @tokens.size >= 2 and @tokens[-2][1] == :on_regexp_end
# end of regexp literal
return false
elsif @tokens.size >= 2 and @tokens[-2][1] == :on_semicolon
return false
elsif @tokens.size >= 2 and @tokens[-2][1] == :on_kw and ['begin', 'else', 'ensure'].include?(@tokens[-2][2])
return false
elsif !@tokens.empty? and @tokens.last[2] == "\\\n"
return true
elsif @tokens.size >= 1 and @tokens[-1][1] == :on_heredoc_end # "EOH\n"
return false
elsif @tokens.size >= 2 and defined?(Ripper::EXPR_BEG) and @tokens[-2][3].anybits?(Ripper::EXPR_BEG | Ripper::EXPR_FNAME)
# end of literal except for regexp
return true
end
false
end
def check_code_block(code)
return true if @tokens.empty?
if @tokens.last[1] == :on_heredoc_beg
return true
end
begin # check if parser error are available
verbose, $VERBOSE = $VERBOSE, nil
case RUBY_ENGINE
when 'jruby'
JRuby.compile_ir(code)
else
self.class.compile_with_errors_suppressed(code) do |inner_code, line_no|
RubyVM::InstructionSequence.compile(inner_code, nil, nil, line_no)
end
end
rescue EncodingError
# This is for a hash with invalid encoding symbol, {"\xAE": 1}
rescue SyntaxError => e
case e.message
when /unterminated (?:string|regexp) meets end of file/
# "unterminated regexp meets end of file"
#
# example:
# /
#
# "unterminated string meets end of file"
#
# example:
# '
return true
when /syntax error, unexpected end-of-input/
# "syntax error, unexpected end-of-input, expecting keyword_end"
#
# example:
# if ture
# hoge
# if false
# fuga
# end
return true
when /syntax error, unexpected keyword_end/
# "syntax error, unexpected keyword_end"
#
# example:
# if (
# end
#
# example:
# end
return false
when /syntax error, unexpected '\.'/
# "syntax error, unexpected '.'"
#
# example:
# .
return false
when /unexpected tREGEXP_BEG/
# "syntax error, unexpected tREGEXP_BEG, expecting keyword_do or '{' or '('"
#
# example:
# method / f /
return false
end
ensure
$VERBOSE = verbose
end
if defined?(Ripper::EXPR_BEG)
last_lex_state = @tokens.last[3]
if last_lex_state.allbits?(Ripper::EXPR_BEG)
return false
elsif last_lex_state.allbits?(Ripper::EXPR_DOT)
return true
elsif last_lex_state.allbits?(Ripper::EXPR_CLASS)
return true
elsif last_lex_state.allbits?(Ripper::EXPR_FNAME)
return true
elsif last_lex_state.allbits?(Ripper::EXPR_VALUE)
return true
elsif last_lex_state.allbits?(Ripper::EXPR_ARG)
return false
end
end
false
end
def process_nesting_level
indent = 0
in_oneliner_def = nil
@tokens.each_with_index { |t, index|
# detecting one-liner method definition
if in_oneliner_def.nil?
if t[3].allbits?(Ripper::EXPR_ENDFN)
in_oneliner_def = :ENDFN
end
else
if t[3].allbits?(Ripper::EXPR_ENDFN)
# continuing
elsif t[3].allbits?(Ripper::EXPR_BEG)
if t[2] == '='
in_oneliner_def = :BODY
end
elsif t[3].allbits?(Ripper::EXPR_END)
if in_oneliner_def == :BODY
# one-liner method definition
indent -= 1
end
in_oneliner_def = nil
else
in_oneliner_def = nil
end
end
case t[1]
when :on_lbracket, :on_lbrace, :on_lparen, :on_tlambeg
indent += 1
when :on_rbracket, :on_rbrace, :on_rparen
indent -= 1
when :on_kw
next if index > 0 and @tokens[index - 1][3].allbits?(Ripper::EXPR_FNAME)
case t[2]
when 'do'
if index > 0 and @tokens[index - 1][3].anybits?(Ripper::EXPR_CMDARG | Ripper::EXPR_ENDFN | Ripper::EXPR_ARG)
# method_with_block do; end
indent += 1
else
# while cond do; end # also "until" or "for"
# This "do" doesn't increment indent because "while" already
# incremented.
end
when 'def', 'case', 'for', 'begin', 'class', 'module'
indent += 1
when 'if', 'unless', 'while', 'until'
# postfix if/unless/while/until must be Ripper::EXPR_LABEL
indent += 1 unless t[3].allbits?(Ripper::EXPR_LABEL)
when 'end'
indent -= 1
end
end
# percent literals are not indented
}
indent
end
def check_newline_depth_difference
depth_difference = 0
open_brace_on_line = 0
in_oneliner_def = nil
@tokens.each_with_index do |t, index|
# detecting one-liner method definition
if in_oneliner_def.nil?
if t[3].allbits?(Ripper::EXPR_ENDFN)
in_oneliner_def = :ENDFN
end
else
if t[3].allbits?(Ripper::EXPR_ENDFN)
# continuing
elsif t[3].allbits?(Ripper::EXPR_BEG)
if t[2] == '='
in_oneliner_def = :BODY
end
elsif t[3].allbits?(Ripper::EXPR_END)
if in_oneliner_def == :BODY
# one[-liner method definition
depth_difference -= 1
end
in_oneliner_def = nil
else
in_oneliner_def = nil
end
end
case t[1]
when :on_ignored_nl, :on_nl, :on_comment
if index != (@tokens.size - 1)
depth_difference = 0
open_brace_on_line = 0
end
next
when :on_sp
next
end
case t[1]
when :on_lbracket, :on_lbrace, :on_lparen, :on_tlambeg
depth_difference += 1
open_brace_on_line += 1
when :on_rbracket, :on_rbrace, :on_rparen
depth_difference -= 1 if open_brace_on_line > 0
when :on_kw
next if index > 0 and @tokens[index - 1][3].allbits?(Ripper::EXPR_FNAME)
case t[2]
when 'do'
if index > 0 and @tokens[index - 1][3].anybits?(Ripper::EXPR_CMDARG | Ripper::EXPR_ENDFN | Ripper::EXPR_ARG)
# method_with_block do; end
depth_difference += 1
else
# while cond do; end # also "until" or "for"
# This "do" doesn't increment indent because "while" already
# incremented.
end
when 'def', 'case', 'for', 'begin', 'class', 'module'
depth_difference += 1
when 'if', 'unless', 'while', 'until', 'rescue'
# postfix if/unless/while/until/rescue must be Ripper::EXPR_LABEL
unless t[3].allbits?(Ripper::EXPR_LABEL)
depth_difference += 1
end
when 'else', 'elsif', 'ensure', 'when', 'in'
depth_difference += 1
end
end
end
depth_difference
end
def check_corresponding_token_depth
corresponding_token_depth = nil
is_first_spaces_of_line = true
is_first_printable_of_line = true
spaces_of_nest = []
spaces_at_line_head = 0
open_brace_on_line = 0
in_oneliner_def = nil
@tokens.each_with_index do |t, index|
# detecting one-liner method definition
if in_oneliner_def.nil?
if t[3].allbits?(Ripper::EXPR_ENDFN)
in_oneliner_def = :ENDFN
end
else
if t[3].allbits?(Ripper::EXPR_ENDFN)
# continuing
elsif t[3].allbits?(Ripper::EXPR_BEG)
if t[2] == '='
in_oneliner_def = :BODY
end
elsif t[3].allbits?(Ripper::EXPR_END)
if in_oneliner_def == :BODY
# one-liner method definition
if is_first_printable_of_line
corresponding_token_depth = spaces_of_nest.pop
else
spaces_of_nest.pop
corresponding_token_depth = nil
end
end
in_oneliner_def = nil
else
in_oneliner_def = nil
end
end
case t[1]
when :on_ignored_nl, :on_nl, :on_comment
corresponding_token_depth = nil
spaces_at_line_head = 0
is_first_spaces_of_line = true
is_first_printable_of_line = true
open_brace_on_line = 0
next
when :on_sp
spaces_at_line_head = t[2].count(' ') if is_first_spaces_of_line
is_first_spaces_of_line = false
next
end
case t[1]
when :on_lbracket, :on_lbrace, :on_lparen, :on_tlambeg
spaces_of_nest.push(spaces_at_line_head + open_brace_on_line * 2)
open_brace_on_line += 1
when :on_rbracket, :on_rbrace, :on_rparen
if is_first_printable_of_line
corresponding_token_depth = spaces_of_nest.pop
else
spaces_of_nest.pop
corresponding_token_depth = nil
end
open_brace_on_line -= 1
when :on_kw
next if index > 0 and @tokens[index - 1][3].allbits?(Ripper::EXPR_FNAME)
case t[2]
when 'def', 'do', 'case', 'for', 'begin', 'class', 'module'
spaces_of_nest.push(spaces_at_line_head)
when 'rescue'
unless t[3].allbits?(Ripper::EXPR_LABEL)
corresponding_token_depth = spaces_of_nest.last
end
when 'if', 'unless', 'while', 'until'
# postfix if/unless/while/until must be Ripper::EXPR_LABEL
unless t[3].allbits?(Ripper::EXPR_LABEL)
spaces_of_nest.push(spaces_at_line_head)
end
when 'else', 'elsif', 'ensure', 'when', 'in'
corresponding_token_depth = spaces_of_nest.last
when 'end'
if is_first_printable_of_line
corresponding_token_depth = spaces_of_nest.pop
else
spaces_of_nest.pop
corresponding_token_depth = nil
end
end
end
is_first_spaces_of_line = false
is_first_printable_of_line = false
end
corresponding_token_depth
end
def check_string_literal
i = 0
start_token = []
end_type = []
while i < @tokens.size
t = @tokens[i]
case t[1]
when :on_tstring_beg
start_token << t
end_type << [:on_tstring_end, :on_label_end]
when :on_regexp_beg
start_token << t
end_type << :on_regexp_end
when :on_symbeg
acceptable_single_tokens = %i{on_ident on_const on_op on_cvar on_ivar on_gvar on_kw}
if (i + 1) < @tokens.size and acceptable_single_tokens.all?{ |t| @tokens[i + 1][1] != t }
start_token << t
end_type << :on_tstring_end
end
when :on_backtick
start_token << t
end_type << :on_tstring_end
when :on_qwords_beg, :on_words_beg, :on_qsymbols_beg, :on_symbols_beg
start_token << t
end_type << :on_tstring_end
when :on_heredoc_beg
start_token << t
end_type << :on_heredoc_end
when *end_type.last
start_token.pop
end_type.pop
end
i += 1
end
start_token.last.nil? ? '' : start_token.last
end
def process_literal_type
start_token = check_string_literal
case start_token[1]
when :on_tstring_beg
case start_token[2]
when ?" then ?"
when /^%.$/ then ?"
when /^%Q.$/ then ?"
when ?' then ?'
when /^%q.$/ then ?'
end
when :on_regexp_beg then ?/
when :on_symbeg then ?:
when :on_backtick then ?`
when :on_qwords_beg then ?]
when :on_words_beg then ?]
when :on_qsymbols_beg then ?]
when :on_symbols_beg then ?]
when :on_heredoc_beg
start_token[2] =~ /<<[-~]?(['"`])[_a-zA-Z0-9]+\1/
case $1
when ?" then ?"
when ?' then ?'
when ?` then ?`
else ?"
end
else
nil
end
end
end
# :startdoc:
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