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|
-- This file is part of SmartEiffel The GNU Eiffel Compiler Tools and Libraries
--
-- SmartEiffel is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License, as published by the
-- Free Software Foundation; either version 2, or (at your option) any later
-- version.
-- SmartEiffel is distributed in the hope that it will be useful but WITHOUT
-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
-- more details. You should have received a copy of the GNU General Public
-- License along with SmartEiffel; see the file COPYING. If not, write to
-- the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
-- MA 02111-1307, USA.
--
-- Copyright(C) 1994-2002: INRIA - LORIA (INRIA Lorraine) - ESIAL U.H.P.
-- - University of Nancy 1 - FRANCE
-- Copyright(C) 2003: INRIA - LORIA (INRIA Lorraine) - I.U.T. Charlemagne
-- - University of Nancy 2 - FRANCE
--
-- Dominique COLNET, Suzanne COLLIN, Olivier ZENDRA,
-- Philippe RIBET, Cyril ADRIAN
--
-- http://SmartEiffel.loria.fr - SmartEiffel@loria.fr
--
class C_COMPACTOR
--
-- Outputs really compact C code
--
-- C_COMPACTOR is a very low-level interface between C_PRETTY_PRINTER and
-- the real file; it understands the notions of C strings, characters and
-- comments; it also knows about symbols, and symbols that should keep
-- their proper name. Any other symbol is, hem... shortened... :o)
--
-- Note that this class is only based on mere heuristics, it's by no means
-- a true C parser!
--
-- Also note that this option considerably slowers the compilation. Double
-- times have been seen.
--
-- See `reserved_words' for the list of non-changed symbols.
--
inherit
GLOBALS
VISITABLE
TEXT_FILE_WRITE
undefine
tmp_file_read
redefine
connect_to, disconnect, is_connected, flush, put_character, make
end
creation {C_PRETTY_PRINTER}
make
feature {C_COMPACTOR_VISITOR}
accept(visitor: C_COMPACTOR_VISITOR) is
do
visitor.visit_c_compactor(Current)
end
feature {NONE}
max_columns: INTEGER is 132
feature
unstripped_count: COUNTER is
once
create Result
end
stripped_count: COUNTER is
once
create Result
end
put_character(c: CHARACTER) is
do
unstripped_count.increment
next_state(c)
end
is_connected: BOOLEAN is
do
Result := output.is_connected
end
flush is
do
output.flush
end
disconnect is
do
out_buffers(wstate = 0)
output.put_new_line
output.disconnect
end
connect_to(a_path: STRING) is
do
output.connect_to(a_path)
end
show_gain is
local
gain: INTEGER
do
gain := (unstripped_count.value - stripped_count.value) * 100 // unstripped_count.value
echo.put_string(once "Compact gain: ")
echo.put_integer(gain)
echo.put_string(once "%%%N")
end
write_symbols(tfw: TEXT_FILE_WRITE) is
local
i, j: INTEGER
k, v: STRING
do
from
i := symbols.lower
until
i > symbols.upper
loop
k := symbols.key(i)
v := symbols.item(i)
if not k.is_equal(v) then
tfw.put_string(once "#define ")
tfw.put_string(v)
tfw.put_character(' ')
tfw.put_string(k)
tfw.put_new_line
from
j := 9 + k.count + v.count
until
j = 0
loop
stripped_count.increment
j := j - 1
end
end
i := i + 1
end
end
register_symbol(s: STRING) is
local
dummy: STRING
do
dummy := compact_symbol(s)
end
feature {NONE}
next_state(cc: CHARACTER) is
do
inspect
state
when 0 then -- Initial normal state.
inspect
cc
when '/' then
new_state(1, False, ' ')
when '%"' then
new_state(4, True, cc)
when '%'' then
new_state(6, True, cc)
when '\' then
new_state(8, True, cc)
when '%T', ' ' then
new_state(10, False, ' ')
when '%N' then
if column > max_columns then
new_state(9, True, '%N')
else
new_state(9, in_macro, '%N')
end
in_macro := False
else
new_state(state, True, cc)
end
when 1 then -- After / with this / delayed.
inspect
cc
when '*' then
new_state(2, False, ' ')
when '/' then
new_state(12, False, ' ')
when '\' then
write('/')
new_state(8, True, cc)
when '%T', ' ' then
write('/')
new_state(10, False, ' ')
when '%N' then
write('/')
if column > max_columns then
new_state(9, True, '%N')
else
new_state(9, in_macro, '%N')
end
in_macro := False
else
write('/')
new_state(0, True, cc)
end
when 2 then -- Inside C comment.
inspect
cc
when '*' then
new_state(3, False, ' ')
else
new_state(state, False, ' ')
end
when 3 then -- Inside C comment after closing *
inspect
cc
when '/' then
new_state(10, False, ' ')
when '*' then
new_state(state, False, ' ')
else
new_state(2, False, ' ')
end
when 4 then -- Inside C string.
inspect
cc
when '%"' then
new_state(0, True, cc)
when '\' then
new_state(5, True, cc)
else
new_state(state, True, cc)
end
when 5 then -- Inside C string, after \
new_state(4, True, cc)
when 6 then -- Inside C character (after the first ' ).
inspect
cc
when '\' then
new_state(7, True, cc)
when '%'' then
new_state(0, True, cc)
else
new_state(6, True, cc)
end
when 7 then -- Inside C character (after '\ )
new_state(6, True, cc)
when 8 then -- After a \
inspect
cc
when '%T', ' ' then
new_state(10, False, ' ')
else
new_state(0, True, cc)
end
when 9 then -- First character of a line (not in string nor comment nor character)
check
not in_macro
end
inspect
cc
when '#' then
if column > 0 then
write('%N')
end
new_state(0, True, cc)
in_macro := True
when '/' then
new_state(1, False, ' ')
when '%"' then
new_state(4, True, cc)
when '%'' then
new_state(6, True, cc)
when '\' then
new_state(8, True, cc)
when '%N' then
new_state(state, False, ' ')
when '%T', ' ' then
new_state(10, False, ' ')
else
new_state(0, True, cc)
end
when 10 then -- Reading useless extra spaces
inspect
cc
when '/' then
new_state(1, False, ' ')
when '%"' then
if in_define then
write(' ')
end
new_state(4, True, cc)
when '%'' then
if in_define then
write(' ')
end
new_state(6, True, cc)
when '\' then
write(' ')
new_state(8, True, cc)
when '%N' then
if column > max_columns then
new_state(11, True, '%N')
else
new_state(11, in_macro, '%N')
end
in_macro := False
when '%T', ' ' then
new_state(state, False, ' ')
else
if column > 0
and then (last_written.is_letter_or_digit or else last_written = '_')
and then (cc.is_letter_or_digit or else cc = '_')
and then not in_macro
then
if column > max_columns then
write('%N')
else
write(' ')
end
elseif in_macro and then column > 1 then
if column > max_columns then
write('%N')
else
write(' ')
end
end
new_state(0, True, cc)
end
when 11 then -- First character in a line, in extra-spaces mode
check
not in_macro
end
inspect
cc
when '#' then
if column > 0 then
write('%N')
end
new_state(0, True, cc)
in_macro := True
when '/' then
new_state(1, False, ' ')
when '%"' then
new_state(4, True, cc)
when '%'' then
new_state(6, True, cc)
when '\' then
new_state(8, True, cc)
when '%N' then
new_state(state, False, ' ')
in_macro := False
when '%T', ' ' then
new_state(10, False, ' ')
else
if column > 0
and then (last_written.is_letter_or_digit or else last_written = '_')
and then (cc.is_letter_or_digit or else cc = '_')
and then not in_macro
then
if column > max_columns then
write('%N')
else
write(' ')
end
elseif in_macro and then column > 1 then
if column > max_columns then
write('%N')
else
write(' ')
end
end
new_state(0, True, cc)
end
when 12 then -- Inside a once-line comment
inspect
cc
when '%N' then
new_state(11, in_macro, '%N')
in_macro := False
else
new_state(state, False, ' ')
end
end
end
new_state(s: INTEGER; call_write: BOOLEAN; c: CHARACTER) is
do
debug
previous_previous_state := previous_state
previous_state := state
end
if state /= s then
out_buffers(wstate = 0)
wstate := 2
end
state := s
if call_write then
write(c)
end
end
write(c: CHARACTER) is
do
check
c /= '%U'
end
if state /= 0 then
out_character(c)
else
inspect
wstate
when 0 then -- reading an identifier
inspect c
when '0'..'9', 'A'..'Z', 'a'..'z', '_' then
wbuffer.extend(c)
else
out_buffers(True)
wstate := 2
out_character(c)
end
when 1 then -- reading a number
inspect c
when '0'..'9' then
wbuffer.extend(c)
when 'x' then
check wbuffer.last = '0' end
wbuffer.extend(c)
hex_number := True;
when 'A'..'F', 'a'..'f' then
if not hex_number then
out_buffers(False)
wstate := 0
end
wbuffer.extend(c)
when 'G'..'Z', 'g'..'w', 'y', 'z', '_' then
out_buffers(False)
wstate := 0
wbuffer.extend(c)
else
out_buffers(False)
wstate := 2
out_character(c)
end
when 2 then -- reading anything else
inspect c
when '0'..'9' then
out_buffers(False)
wbuffer.extend(c)
wstate := 1
when 'A'..'Z', 'a'..'z', '_' then
out_buffers(False)
wbuffer.extend(c)
wstate := 0
else
out_character(c)
end
end
end
end
compact_symbol(s: STRING): STRING is
require
s /= Void
local
symb: STRING
do
Result := once ""
if in_include or else in_ifdef or else in_define
or else (in_macro and then reserved_cpp_words.has(s))
or else reserved_words.has(s) then
Result.copy(s)
elseif symbols.has(s) then
Result.copy(symbols.at(s))
elseif s.count <= 3 then
Result.copy(s)
symb := Result.twin
symbols.put(symb, s.twin)
else
counter.next
Result.copy(once "Z")
counter.append_in(Result)
symb := Result.twin
symbols.put(symb, s.twin)
end
if in_macro then
if not in_include then
in_include := (once "include").is_equal(s)
end
if not in_define then
in_define := (once "define").is_equal(s)
end
in_ifdef := define_words.has(s)
else
in_include := False
in_ifdef := False
in_define := False
end
ensure
Result /= Void
end
out_buffers(do_compact: BOOLEAN) is
do
if not wbuffer.is_empty then
if do_compact then
obuffer.prepend(compact_symbol(wbuffer))
else
obuffer.prepend(wbuffer)
end
wbuffer.clear
end
out_string(obuffer)
obuffer.clear
end
out_string(s: STRING) is
local
i, n: INTEGER
do
n := s.count
from
i := 1
until
i > n
loop
out_character(s.item(i))
i := i + 1
end
end
out_character(c: CHARACTER) is
do
if wbuffer.is_empty then
output.put_character(c)
stripped_count.increment
else
obuffer.extend(c)
end
if c = '%N' then
column := 0
else
column := column + 1
end
last_written := c
end
feature {NONE}
state: INTEGER
-- State machine
in_macro: BOOLEAN
-- Are we inside a macro definition
in_include: BOOLEAN
-- Are we inside a #include
in_ifdef: BOOLEAN
-- Are we inside a #ifdef
in_define: BOOLEAN
-- Are we inside a #define
hex_number: BOOLEAN
-- Are we parsing a hexadecimal integer
previous_previous_state, previous_state: INTEGER
last_written: CHARACTER
wstate: INTEGER
wbuffer: STRING is ""
obuffer: STRING is ""
column: INTEGER
output: TEXT_FILE_WRITE
symbols: DICTIONARY[STRING, STRING] is
once
create Result.with_capacity(4096)
end
make is
do
create output.make
state := 9
wstate := 2
end
counter: COUNTER63 is
once
create Result.make
end
reserved_words: ARRAY[STRING] is
once
Result := <<
"auto" "break" "case" "char"
"const" "continue" "default" "do"
"double" "else" "enum" "extern"
"float" "for" "goto" "if"
"int" "long" "main" "register"
"return" "short" "signed" "sizeof"
"static" "struct" "switch" "typedef"
"union" "unsigned" "void" "volatile"
"while"
"main"
>>
end
reserved_cpp_words: ARRAY[STRING] is
once
Result := <<
"include" "ifdef" "ifndef" "define"
"if" "elif" "endif" "defined"
"error" "pragma"
>>
end
define_words: ARRAY[STRING] is
once
Result := <<
"ifdef" "ifndef" "defined"
>>
end
invariant
output /= Void
end
|
