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ripper: add states of scanner

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* parse.y (ripper_state): add states of scanner to tokens from
  Ripper.lex and Ripper::Filter#on_*.  based on the patch by
  aycabta (Code Ahss) at [ruby-core:81789].  [Feature #13686]

* ext/ripper/tools/preproc.rb (prelude, usercode): generate EXPR_*
  constants from enums.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59896 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2017-09-14 10:53:47 +00:00
parent a61ae940c6
commit 7df1e45bb6
8 changed files with 138 additions and 69 deletions
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7
NEWS
View file

@ -133,6 +133,13 @@ with all sufficient information, see the ChangeLog file or Redmine
* New constants:
* RbConfig::LIMITS is added to provide the limits of C types.
* Ripper
* New method:
* Ripper#state is added to tell the state of scanner. [Feature #13686]
* New constants:
* Ripper::EXPR_BEG and so on for Ripper#state.
* Set
* Add Set#to_s as alias to #inspect [Feature #13676]

10
ext/ripper/lib/ripper/filter.rb
View file

@ -25,6 +25,7 @@ class Ripper
@__lexer = Lexer.new(src, filename, lineno)
@__line = nil
@__col = nil
@__state = nil
end
# The file name of the input.
@ -46,13 +47,20 @@ class Ripper
@__col
end
# The scanner's state of the current token.
# This value is the bitwise OR of zero or more of the +Ripper::EXPR_*+ constants.
def state
@__state
end
# Starts the parser.
# +init+ is a data accumulator and is passed to the next event handler (as
# of Enumerable#inject).
def parse(init = nil)
data = init
@__lexer.lex.each do |pos, event, tok|
@__lexer.lex.each do |pos, event, tok, state|
@__line, @__col = *pos
@__state = state
data = if respond_to?(event, true)
then __send__(event, tok, data)
else on_default(event, tok, data)

33
ext/ripper/lib/ripper/lexer.rb
View file

@ -23,29 +23,30 @@ class Ripper
end
# Tokenizes the Ruby program and returns an array of an array,
# which is formatted like <code>[[lineno, column], type, token]</code>.
# which is formatted like
# <code>[[lineno, column], type, token, state]</code>.
#
# require 'ripper'
# require 'pp'
#
# pp Ripper.lex("def m(a) nil end")
# #=> [[[1, 0], :on_kw, "def"],
# [[1, 3], :on_sp, " " ],
# [[1, 4], :on_ident, "m" ],
# [[1, 5], :on_lparen, "(" ],
# [[1, 6], :on_ident, "a" ],
# [[1, 7], :on_rparen, ")" ],
# [[1, 8], :on_sp, " " ],
# [[1, 9], :on_kw, "nil"],
# [[1, 12], :on_sp, " " ],
# [[1, 13], :on_kw, "end"]]
# #=> [[[1, 0], :on_kw, "def", Ripper::EXPR_FNAME ],
# [[1, 3], :on_sp, " ", Ripper::EXPR_FNAME ],
# [[1, 4], :on_ident, "m", Ripper::EXPR_ENDFN ],
# [[1, 5], :on_lparen, "(", Ripper::EXPR_LABEL | Ripper::EXPR_BEG],
# [[1, 6], :on_ident, "a", Ripper::EXPR_ARG ],
# [[1, 7], :on_rparen, ")", Ripper::EXPR_ENDFN ],
# [[1, 8], :on_sp, " ", Ripper::EXPR_BEG ],
# [[1, 9], :on_kw, "nil", Ripper::EXPR_END ],
# [[1, 12], :on_sp, " ", Ripper::EXPR_END ],
# [[1, 13], :on_kw, "end", Ripper::EXPR_END ]]
#
def Ripper.lex(src, filename = '-', lineno = 1)
Lexer.new(src, filename, lineno).lex
end
class Lexer < ::Ripper #:nodoc: internal use only
Elem = Struct.new(:pos, :event, :tok)
Elem = Struct.new(:pos, :event, :tok, :state)
def tokenize
parse().sort_by(&:pos).map(&:tok)
@ -77,7 +78,7 @@ class Ripper
e.event = :on_ignored_sp
next
end
ignored_sp << [i, Elem.new(e.pos.dup, :on_ignored_sp, tok[0, n])]
ignored_sp << [i, Elem.new(e.pos.dup, :on_ignored_sp, tok[0, n], e.state)]
e.pos[1] += n
end
end
@ -93,16 +94,16 @@ class Ripper
buf = []
@buf << buf
@buf = buf
@buf.push Elem.new([lineno(), column()], __callee__, tok)
@buf.push Elem.new([lineno(), column()], __callee__, tok, state())
end
def on_heredoc_end(tok)
@buf.push Elem.new([lineno(), column()], __callee__, tok)
@buf.push Elem.new([lineno(), column()], __callee__, tok, state())
@buf = @stack.pop
end
def _push_token(tok)
@buf.push Elem.new([lineno(), column()], __callee__, tok)
@buf.push Elem.new([lineno(), column()], __callee__, tok, state())
end
(SCANNER_EVENTS.map {|event|:"on_#{event}"} - private_instance_methods(false)).each do |event|

20
ext/ripper/tools/preproc.rb
View file

@ -40,6 +40,7 @@ def main
end
def prelude(f, out)
@exprs = {}
while line = f.gets
case line
when %r</\*%%%\*/>
@ -56,6 +57,16 @@ def prelude(f, out)
when /\A%type/
out << line.sub(/<\w+>/, '<val>')
else
if (/^enum lex_state_(?:bits|e) \{/ =~ line)..(/^\}/ =~ line)
case line
when /^\s*(EXPR_\w+),\s+\/\*(.+)\*\//
@exprs[$1.chomp("_bit")] = $2.strip
when /^\s*(EXPR_\w+)\s+=\s+(.+)$/
name = $1
val = $2.chomp(",")
@exprs[name] = "equals to " + (val.start_with?("(") ? "<tt>#{val}</tt>" : "+#{val}+")
end
end
out << line
end
end
@ -84,9 +95,12 @@ def grammar(f, out)
end
def usercode(f, out)
while line = f.gets
out << line
end
require 'erb'
compiler = ERB::Compiler.new('%-')
compiler.put_cmd = compiler.insert_cmd = "out.<<"
lineno = f.lineno
src, = compiler.compile(f.read)
eval(src, binding, f.path, lineno)
end
main

24
parse.y
View file

@ -11446,6 +11446,25 @@ ripper_lineno(VALUE self)
return INT2NUM(ruby_sourceline);
}
/*
* call-seq:
* ripper.state -> Integer
*
* Return scanner state of current token.
*/
static VALUE
ripper_state(VALUE self)
{
struct parser_params *parser;
TypedData_Get_Struct(self, struct parser_params, &parser_data_type, parser);
if (!ripper_initialized_p(parser)) {
rb_raise(rb_eArgError, "method called for uninitialized object");
}
if (NIL_P(parser->parsing_thread)) return Qnil;
return INT2NUM(lex_state);
}
#ifdef RIPPER_DEBUG
/* :nodoc: */
static VALUE
@ -11493,6 +11512,7 @@ InitVM_ripper(void)
rb_define_method(Ripper, "column", ripper_column, 0);
rb_define_method(Ripper, "filename", ripper_filename, 0);
rb_define_method(Ripper, "lineno", ripper_lineno, 0);
rb_define_method(Ripper, "state", ripper_state, 0);
rb_define_method(Ripper, "end_seen?", rb_parser_end_seen_p, 0);
rb_define_method(Ripper, "encoding", rb_parser_encoding, 0);
rb_define_method(Ripper, "yydebug", rb_parser_get_yydebug, 0);
@ -11507,6 +11527,10 @@ InitVM_ripper(void)
rb_define_singleton_method(Ripper, "dedent_string", parser_dedent_string, 2);
rb_define_private_method(Ripper, "dedent_string", parser_dedent_string, 2);
<% @exprs.each do |expr, desc| -%>
/* <%=desc%> */
rb_define_const(Ripper, "<%=expr%>", INT2NUM(<%=expr%>));
<% end %>
ripper_init_eventids1_table(Ripper);
ripper_init_eventids2_table(Ripper);

11
test/ripper/test_filter.rb
View file

@ -15,6 +15,7 @@ class TestRipper::Filter < Test::Unit::TestCase
data[:filename] = filename rescue nil
data[:lineno] = lineno
data[:column] = column
data[:state] = state
data[:token] = token
end
data
@ -75,6 +76,16 @@ class TestRipper::Filter < Test::Unit::TestCase
assert_equal(last_columns, filter.column)
end
def test_filter_state
data = {}
src = File.read(filename)
filter = Filter.new(src)
assert_equal(nil, filter.state)
filter.parse(data)
assert_not_nil(data[:state])
assert_not_nil(filter.state)
end
def test_filter_token
data = {}
filter = Filter.new("begin; puts 1; end")

4
test/ripper/test_ripper.rb
View file

@ -17,6 +17,10 @@ class TestRipper::Ripper < Test::Unit::TestCase
assert_nil @ripper.column
end
def test_state
assert_nil @ripper.state
end
def test_encoding
assert_equal Encoding::UTF_8, @ripper.encoding
ripper = Ripper.new('# coding: iso-8859-15')

98
test/ripper/test_scanner_events.rb
View file

@ -48,70 +48,70 @@ class TestRipper::ScannerEvents < Test::Unit::TestCase
def test_lex
assert_equal [],
Ripper.lex('')
assert_equal [[[1,0], :on_ident, "a"]],
assert_equal [[[1,0], :on_ident, "a", Ripper::EXPR_CMDARG]],
Ripper.lex('a')
assert_equal [[[1, 0], :on_kw, "nil"]],
assert_equal [[[1, 0], :on_kw, "nil", Ripper::EXPR_END]],
Ripper.lex("nil")
assert_equal [[[1, 0], :on_kw, "def"],
[[1, 3], :on_sp, " "],
[[1, 4], :on_ident, "m"],
[[1, 5], :on_lparen, "("],
[[1, 6], :on_ident, "a"],
[[1, 7], :on_rparen, ")"],
[[1, 8], :on_kw, "end"]],
assert_equal [[[1, 0], :on_kw, "def", Ripper::EXPR_FNAME],
[[1, 3], :on_sp, " ", Ripper::EXPR_FNAME],
[[1, 4], :on_ident, "m", Ripper::EXPR_ENDFN],
[[1, 5], :on_lparen, "(", Ripper::EXPR_BEG | Ripper::EXPR_LABEL],
[[1, 6], :on_ident, "a", Ripper::EXPR_ARG],
[[1, 7], :on_rparen, ")", Ripper::EXPR_ENDFN],
[[1, 8], :on_kw, "end", Ripper::EXPR_END]],
Ripper.lex("def m(a)end")
assert_equal [[[1, 0], :on_int, "1"],
[[1, 1], :on_nl, "\n"],
[[2, 0], :on_int, "2"],
[[2, 1], :on_nl, "\n"],
[[3, 0], :on_int, "3"]],
assert_equal [[[1, 0], :on_int, "1", Ripper::EXPR_END | Ripper::EXPR_ENDARG],
[[1, 1], :on_nl, "\n", Ripper::EXPR_BEG],
[[2, 0], :on_int, "2", Ripper::EXPR_END | Ripper::EXPR_ENDARG],
[[2, 1], :on_nl, "\n", Ripper::EXPR_BEG],
[[3, 0], :on_int, "3", Ripper::EXPR_END | Ripper::EXPR_ENDARG]],
Ripper.lex("1\n2\n3")
assert_equal [[[1, 0], :on_heredoc_beg, "<<""EOS"],
[[1, 5], :on_nl, "\n"],
[[2, 0], :on_tstring_content, "heredoc\n"],
[[3, 0], :on_heredoc_end, "EOS"]],
assert_equal [[[1, 0], :on_heredoc_beg, "<<""EOS", Ripper::EXPR_BEG],
[[1, 5], :on_nl, "\n", Ripper::EXPR_BEG],
[[2, 0], :on_tstring_content, "heredoc\n", Ripper::EXPR_BEG],
[[3, 0], :on_heredoc_end, "EOS", Ripper::EXPR_BEG]],
Ripper.lex("<<""EOS\nheredoc\nEOS")
assert_equal [[[1, 0], :on_heredoc_beg, "<<""EOS"],
[[1, 5], :on_nl, "\n"],
[[2, 0], :on_heredoc_end, "EOS"]],
assert_equal [[[1, 0], :on_heredoc_beg, "<<""EOS", Ripper::EXPR_BEG],
[[1, 5], :on_nl, "\n", Ripper::EXPR_BEG],
[[2, 0], :on_heredoc_end, "EOS", Ripper::EXPR_BEG]],
Ripper.lex("<<""EOS\nEOS"),
"bug#4543"
assert_equal [[[1, 0], :on_regexp_beg, "/"],
[[1, 1], :on_tstring_content, "foo\nbar"],
[[2, 3], :on_regexp_end, "/"]],
assert_equal [[[1, 0], :on_regexp_beg, "/", Ripper::EXPR_BEG],
[[1, 1], :on_tstring_content, "foo\nbar", Ripper::EXPR_BEG],
[[2, 3], :on_regexp_end, "/", Ripper::EXPR_BEG]],
Ripper.lex("/foo\nbar/")
assert_equal [[[1, 0], :on_regexp_beg, "/"],
[[1, 1], :on_tstring_content, "foo\n\u3020"],
[[2, 3], :on_regexp_end, "/"]],
assert_equal [[[1, 0], :on_regexp_beg, "/", Ripper::EXPR_BEG],
[[1, 1], :on_tstring_content, "foo\n\u3020", Ripper::EXPR_BEG],
[[2, 3], :on_regexp_end, "/", Ripper::EXPR_BEG]],
Ripper.lex("/foo\n\u3020/")
assert_equal [[[1, 0], :on_tstring_beg, "'"],
[[1, 1], :on_tstring_content, "foo\n\xe3\x80\xa0"],
[[2, 3], :on_tstring_end, "'"]],
assert_equal [[[1, 0], :on_tstring_beg, "'", Ripper::EXPR_BEG],
[[1, 1], :on_tstring_content, "foo\n\xe3\x80\xa0", Ripper::EXPR_BEG],
[[2, 3], :on_tstring_end, "'", Ripper::EXPR_END | Ripper::EXPR_ENDARG]],
Ripper.lex("'foo\n\xe3\x80\xa0'")
assert_equal [[[1, 0], :on_tstring_beg, "'"],
[[1, 1], :on_tstring_content, "\u3042\n\u3044"],
[[2, 3], :on_tstring_end, "'"]],
assert_equal [[[1, 0], :on_tstring_beg, "'", Ripper::EXPR_BEG],
[[1, 1], :on_tstring_content, "\u3042\n\u3044", Ripper::EXPR_BEG],
[[2, 3], :on_tstring_end, "'", Ripper::EXPR_END | Ripper::EXPR_ENDARG]],
Ripper.lex("'\u3042\n\u3044'")
assert_equal [[[1, 0], :on_rational, "1r"],
[[1, 2], :on_nl, "\n"],
[[2, 0], :on_imaginary, "2i"],
[[2, 2], :on_nl, "\n"],
[[3, 0], :on_imaginary, "3ri"],
[[3, 3], :on_nl, "\n"],
[[4, 0], :on_rational, "4.2r"],
[[4, 4], :on_nl, "\n"],
[[5, 0], :on_imaginary, "5.6ri"],
assert_equal [[[1, 0], :on_rational, "1r", Ripper::EXPR_END | Ripper::EXPR_ENDARG],
[[1, 2], :on_nl, "\n", Ripper::EXPR_BEG],
[[2, 0], :on_imaginary, "2i", Ripper::EXPR_END | Ripper::EXPR_ENDARG],
[[2, 2], :on_nl, "\n", Ripper::EXPR_BEG],
[[3, 0], :on_imaginary, "3ri", Ripper::EXPR_END | Ripper::EXPR_ENDARG],
[[3, 3], :on_nl, "\n", Ripper::EXPR_BEG],
[[4, 0], :on_rational, "4.2r", Ripper::EXPR_END | Ripper::EXPR_ENDARG],
[[4, 4], :on_nl, "\n", Ripper::EXPR_BEG],
[[5, 0], :on_imaginary, "5.6ri", Ripper::EXPR_END | Ripper::EXPR_ENDARG],
],
Ripper.lex("1r\n2i\n3ri\n4.2r\n5.6ri")
assert_equal [[[1, 0], :on_heredoc_beg, "<<~EOS"],
[[1, 6], :on_nl, "\n"],
[[2, 0], :on_ignored_sp, " "],
[[2, 2], :on_tstring_content, "heredoc\n"],
[[3, 0], :on_heredoc_end, "EOS"]
assert_equal [[[1, 0], :on_heredoc_beg, "<<~EOS", Ripper::EXPR_BEG],
[[1, 6], :on_nl, "\n", Ripper::EXPR_BEG],
[[2, 0], :on_ignored_sp, " ", Ripper::EXPR_BEG],
[[2, 2], :on_tstring_content, "heredoc\n", Ripper::EXPR_BEG],
[[3, 0], :on_heredoc_end, "EOS", Ripper::EXPR_BEG]
],
Ripper.lex("<<~EOS\n heredoc\nEOS")
assert_equal [[[1, 0], :on_tstring_beg, "'"],
[[1, 1], :on_tstring_content, "foo"]],
assert_equal [[[1, 0], :on_tstring_beg, "'", Ripper::EXPR_BEG],
[[1, 1], :on_tstring_content, "foo", Ripper::EXPR_BEG]],
Ripper.lex("'foo")
end