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Diffstat (limited to 'lib/tools/test/eprof_SUITE_data/eed.erl')
| -rw-r--r-- | lib/tools/test/eprof_SUITE_data/eed.erl | 815 |
1 files changed, 815 insertions, 0 deletions
diff --git a/lib/tools/test/eprof_SUITE_data/eed.erl b/lib/tools/test/eprof_SUITE_data/eed.erl new file mode 100644 index 0000000000..0175abdd0e --- /dev/null +++ b/lib/tools/test/eprof_SUITE_data/eed.erl @@ -0,0 +1,815 @@ +%%%---------------------------------------------------------------------- +%%% File : eed.erl +%%% Author : Bjorn Gustavsson <bjorn@strider> +%%% Purpose : Unix `ed' look-alike. +%%% Created : 24 Aug 1997 by Bjorn Gustavsson <bjorn@strider> +%%%---------------------------------------------------------------------- + +-module(eed). +-author('bjorn@strider'). + +-export([edit/0, edit/1, file/1, cmd_line/1]). + +-record(state, {dot = 0, % Line number of dot. + upto_dot = [], % Lines up to dot (reversed). + after_dot = [], % Lines after dot. + lines = 0, % Total number of lines. + print=false, % Print after command. + filename=[], % Current file. + pattern, % Current pattern. + in_global=false, % True if executing global command. + input=[], % Global input stream. + undo, % Last undo state. + marks=[], % List of marks. + modified=false, % Buffer is modified. + opts=[{prompt, ''}], % Options. + last_error, % The last error encountered. + input_fd % Input file descriptor. + }). + +-record(line, {contents, % Contents of line. + mark=false % Marked (for global prefix). + }). + +cmd_line([Script]) -> + file(Script), + halt(). + +file(Script) -> + case file:open(Script, [read]) of + {ok,Fd} -> + loop(#state{input_fd=Fd}), + ok; + {error,E} -> + {error,E} + end. + +edit() -> + loop(#state{input_fd=group_leader()}). + +edit(Name) -> + loop(command([$e|Name], #state{input_fd=group_leader()})). + +loop(St0) -> + {ok, St1, Cmd} = get_line(St0), + case catch command(lib:nonl(Cmd), St1) of + {'EXIT', Reason} -> + %% XXX Should clear outstanding global command here. + loop(print_error({'EXIT', Reason}, St1)); + quit -> + ok; + {error, Reason} -> + loop(print_error(Reason, St1)); + St2 when record(St2, state) -> + loop(St2) + end. + +command(Cmd, St) -> + case parse_command(Cmd, St) of + quit -> + quit; + St1 when function(St1#state.print) -> + if + St1#state.dot /= 0 -> + print_current(St1); + true -> + ok + end, + St1#state{print=false}; + St1 when record(St1, state) -> + St1 + end. + +get_line(St) -> + Opts = St#state.opts, + {value, {prompt, Prompt}} = lists:keysearch(prompt, 1, Opts), + get_line(Prompt, St). + +get_line(Prompt, St) when St#state.input == [] -> + Line = get_line1(St#state.input_fd, Prompt, []), + {ok, St, Line}; +get_line(_, St) -> + get_input(St#state.input, St, []). + +get_input([eof], St, []) -> + {ok, St, eof}; +get_input([eof], St, Result) -> + {ok, St#state{input=[eof]}, lists:reverse(Result)}; +get_input([$\n|Rest], St, Result) -> + {ok, St#state{input=Rest}, lists:reverse(Result)}; +get_input([C|Rest], St, Result) -> + get_input(Rest, St, [C|Result]). + +get_line1(Io, Prompt, Result) -> + get_line2(Io, io:get_line(Io, Prompt), Result). + +get_line2(Io, eof, []) -> + eof; +get_line2(Io, eof, Result) -> + lists:reverse(Result); +get_line2(Io, [$\\, $\n], Result) -> + get_line1(Io, '', [$\n|Result]); +get_line2(Io, [$\n], Result) -> + lists:reverse(Result, [$\n]); +get_line2(Io, [C|Rest], Result) -> + get_line2(Io, Rest, [C|Result]). + +print_error(Reason, St0) -> + St1 = St0#state{last_error=Reason}, + io:put_chars("?\n"), + case lists:member(help_always, St1#state.opts) of + true -> + help_command([], [], St1), + St1; + false -> + St1 + end. + +format_error(bad_command) -> "unknown command"; +format_error(bad_filename) -> "illegal or missing filename"; +format_error(bad_file) -> "cannot open input file"; +format_error(bad_linenum) -> "line out of range"; +format_error(bad_delimiter) -> "illegal or missing delimiter"; +format_error(bad_undo) -> "nothing to undo"; +format_error(bad_mark) -> "mark not lower case ascii"; +format_error(bad_pattern) -> "invalid regular expression"; +format_error(buffer_modified) -> "warning: expecting `w'"; +format_error(nested_globals) -> "multiple globals not allowed"; +format_error(nomatch) -> "search string not found"; +format_error(missing_space) -> "no space after command"; +format_error(garbage_after_command) -> "illegal suffix"; +format_error(not_implemented) -> "not implemented yet"; +format_error({'EXIT', {Code, {Mod, Func, Args}}}) -> + lists:flatten(io_lib:format("aborted due to bug (~p)", + [{Code, {Mod, Func, length(Args)}}])); +format_error(A) -> atom_to_list(A). + + + +%%% Parsing commands. + +parse_command(Cmd, St) -> + parse_command(Cmd, St, []). + +parse_command(Cmd, State, Nums) -> + case get_one(Cmd, State) of + {ok, Num, Rest, NewState} -> + parse_next_address(Rest, NewState, [Num|Nums]); + false -> + parse_command1(Cmd, State, Nums) + end. + +parse_next_address([$,|Rest], State, Nums) -> + parse_command(Rest, State, Nums); +parse_next_address([$;|Rest], State, [Num|Nums]) -> + parse_command(Rest, move_to(Num, State), [Num|Nums]); +parse_next_address(Rest, State, Nums) -> + parse_command1(Rest, State, Nums). + +parse_command1([Letter|Rest], State, Nums) -> + Cont = fun(Fun, NumLines, Def) -> + execute_command(Fun, NumLines, Def, State, Nums, Rest) end, + parse_cmd_char(Letter, Cont); +parse_command1([], State, Nums) -> + execute_command(fun print_command/3, 1, next, State, Nums, []). + +get_one(Cmd, St) -> + case get_address(Cmd, St) of + {ok, Addr, Cmd1, St1} -> + get_one1(Cmd1, Addr, St1); + false -> + get_one1(Cmd, false, St) + end. + +get_one1([D|Rest], false, St) when $0 =< D, D =< $9 -> + get_one2(get_number([D|Rest]), 1, 0, St); +get_one1([D|Rest], Sum, St) when $0 =< D, D =< $9 -> + get_one2(get_number([D|Rest]), 1, Sum, St); +get_one1([$+, D|Rest], Sum, St) when $0 =< D, D =< $9 -> + get_one2(get_number([D|Rest]), 1, Sum, St); +get_one1([$-, D|Rest], Sum, St) when $0 =< D, D =< $9 -> + get_one2(get_number([D|Rest]), -1, Sum, St); +get_one1([$+|Rest], Sum, St) -> + get_one2({ok, 1, Rest}, 1, Sum, St); +get_one1([$-|Rest], Sum, St) -> + get_one2({ok, 1, Rest}, -1, Sum, St); +get_one1(Cmd, false, St) -> + false; +get_one1(Cmd, Sum, St) -> + {ok, Sum, Cmd, St}. + +get_one2({ok, Number, Rest}, Mul, false, St) -> + get_one1(Rest, St#state.dot+Mul*Number, St); +get_one2({ok, Number, Rest}, Mul, Sum, St) -> + get_one1(Rest, Sum+Mul*Number, St). + +get_number(Cmd) -> + get_number(Cmd, 0). + +get_number([D|Rest], Result) when $0 =< D, D =< $9 -> + get_number(Rest, Result*10+D-$0); +get_number(Rest, Result) -> + {ok, Result, Rest}. + +get_address([$.|Rest], State) -> + {ok, State#state.dot, Rest, State}; +get_address([$$|Rest], State) -> + {ok, State#state.lines, Rest, State}; +get_address([$', Mark|Rest], St) when $a =< Mark, Mark =< $z -> + case lists:keysearch(Mark, 2, St#state.marks) of + {value, {Line, Mark}} -> + {ok, Line, Rest, St}; + false -> + {ok, 0, Rest, St} + end; +get_address([$'|Rest], State) -> + error(bad_mark); +get_address([$/|Rest], State) -> + scan_forward($/, Rest, State); +get_address([$?|Rest], State) -> + error(not_implemented); +get_address(Cmd, St) -> + false. + +scan_forward(End, Patt0, State) -> + {ok, Rest, NewState} = get_pattern(End, Patt0, State), + Dot = NewState#state.dot, + After = NewState#state.after_dot, + scan_forward1(Dot+1, After, NewState, Rest). + +scan_forward1(Linenum, [Line|Rest], State, RestCmd) -> + case regexp:first_match(Line#line.contents, State#state.pattern) of + {match, _, _} -> + {ok, Linenum, RestCmd, State}; + nomatch -> + scan_forward1(Linenum+1, Rest, State, RestCmd) + end; +scan_forward1(_, [], State, RestCmd) -> + Dot = State#state.dot, + Upto = State#state.upto_dot, + case scan_forward2(Dot, Upto, State, RestCmd) of + false -> + error(bad_linenum); + Other -> + Other + end. + +scan_forward2(0, [], State, RestCmd) -> + false; +scan_forward2(Linenum, [Line|Rest], State, RestCmd) -> + case scan_forward2(Linenum-1, Rest, State, RestCmd) of + false -> + case regexp:first_match(Line#line.contents, State#state.pattern) of + {match, _, _} -> + {ok, Linenum, RestCmd, State}; + nomatch -> + false + end; + Other -> + Other + end. + +parse_cmd_char($S, Cont) -> Cont(fun quest_command/3, 0, none); +parse_cmd_char($T, Cont) -> Cont(fun time_command/3, 0, none); +parse_cmd_char($=, Cont) -> Cont(fun print_linenum/3, 1, last); +parse_cmd_char($a, Cont) -> Cont(fun append_command/3, 1, dot); +parse_cmd_char($c, Cont) -> Cont(fun change_command/3, 2, dot); +parse_cmd_char($d, Cont) -> Cont(fun delete_command/3, 2, dot); +parse_cmd_char($e, Cont) -> Cont(fun enter_command/3, 0, none); +parse_cmd_char($E, Cont) -> Cont(fun enter_always_command/3, 0, none); +parse_cmd_char($f, Cont) -> Cont(fun file_command/3, 0, none); +parse_cmd_char($g, Cont) -> Cont(fun global_command/3, 2, all); +parse_cmd_char($h, Cont) -> Cont(fun help_command/3, 0, none); +parse_cmd_char($H, Cont) -> Cont(fun help_always_command/3, 0, none); +parse_cmd_char($i, Cont) -> Cont(fun insert_command/3, 1, dot); +parse_cmd_char($k, Cont) -> Cont(fun mark_command/3, 1, dot); +parse_cmd_char($l, Cont) -> Cont(fun list_command/3, 2, dot); +parse_cmd_char($m, Cont) -> Cont(fun move_command/3, 2, dot); +parse_cmd_char($n, Cont) -> Cont(fun number_command/3, 2, dot); +parse_cmd_char($p, Cont) -> Cont(fun print_command/3, 2, dot); +parse_cmd_char($P, Cont) -> Cont(fun prompt_command/3, 0, none); +parse_cmd_char($q, Cont) -> Cont(fun quit_command/3, 0, none); +parse_cmd_char($Q, Cont) -> Cont(fun quit_always_command/3, 0, none); +parse_cmd_char($r, Cont) -> Cont(fun read_command/3, 1, last); +parse_cmd_char($s, Cont) -> Cont(fun subst_command/3, 2, dot); +parse_cmd_char($t, Cont) -> Cont(fun transpose_command/3, 2, dot); +parse_cmd_char($u, Cont) -> Cont(fun undo_command/3, 0, none); +parse_cmd_char($v, Cont) -> Cont(fun vglobal_command/3, 2, all); +parse_cmd_char($w, Cont) -> Cont(fun write_command/3, 2, all); +parse_cmd_char(_, Cont) -> error(bad_command). + +execute_command(Fun, NumLines, Def, State, Nums, Rest) -> + Lines = check_lines(NumLines, Def, Nums, State), + Fun(Rest, Lines, State). + +check_lines(0, _, [], _State) -> + []; +check_lines(1, dot, [], #state{dot=Dot}) -> + [Dot]; +check_lines(1, next, [], State) when State#state.dot < State#state.lines -> + [State#state.dot+1]; +check_lines(1, last, [], State) -> + [State#state.lines]; +check_lines(1, _, [Num|_], State) when 0 =< Num, Num =< State#state.lines -> + [Num]; +check_lines(2, dot, [], #state{dot=Dot}) -> + [Dot, Dot]; +check_lines(2, all, [], #state{lines=Lines}) -> + [1, Lines]; +check_lines(2, _, [Num], State) when 0 =< Num, Num =< State#state.lines -> + [Num, Num]; +check_lines(2, _, [Num2, Num1|_], State) +when 0 =< Num1, Num1 =< Num2, Num2 =< State#state.lines -> + [Num1, Num2]; +check_lines(_, _, _, _) -> + error(bad_linenum). + + +%%% Executing commands. + +%% ($)= - print line number + +print_linenum(Rest, [Line], State) -> + NewState = check_trailing_p(Rest, State), + io:format("~w\n", [Line]), + NewState. + +%% ? - print state (for debugging) + +quest_command([], [], State) -> + io:format("~p\n", [State]), + State. + +%% Tcmd - time command + +time_command(Cmd, [], St) -> + Fun = fun parse_command/2, + erlang:garbage_collect(), + {Elapsed, Val} = timer:tc(erlang, apply, [Fun, [Cmd, St]]), + io:format("Time used: ~p s~n", [Elapsed/1000000.0]), + case Val of + {error, Reason} -> + throw({error, Reason}); + Other -> + Other + end. + +%% (.)a - append text + +append_command(Rest, [Line], St0) -> + St1 = save_for_undo(St0), + append(move_to(Line, check_trailing_p(Rest, St1))). + +append(St0) -> + {ok, St1, Line0} = get_line('', St0), + case Line0 of + eof -> + St1; + ".\n" -> + St1; + Line -> + append(insert_line(Line, St1)) + end. + +%% (.,.)c + +change_command(Rest, Lines, St0) -> + St1 = delete_command(Rest, Lines, St0), + St2 = append_command([], [St1#state.dot-1], St1), + save_for_undo(St2, St0). + +%% (.,.)d - delete lines + +delete_command(Rest, [0, Last], St) -> + error(bad_linenum); +delete_command(Rest, [First, Last], St0) -> + St1 = check_trailing_p(Rest, save_for_undo(St0)), + delete(Last-First+1, move_to(Last, St1)). + +delete(0, St) when St#state.dot == St#state.lines -> + St; +delete(0, St) -> + next_line(St); +delete(Left, St0) -> + St1 = delete_current_line(St0), + delete(Left-1, St1). + +%% e file - replace buffer with new file + +enter_command(Name, [], St) when St#state.modified == true -> + error(buffer_modified); +enter_command(Name, [], St0) -> + enter_always_command(Name, [], St0). + +%% E file - replace buffer with new file + +enter_always_command(Name, [], St0) -> + St1 = read_command(Name, [0], #state{filename=St0#state.filename, + opts=St0#state.opts}), + St1#state{modified=false}. + +%% f file - print filename; set filename + +file_command([], [], St) -> + io:format("~s~n", [St#state.filename]), + St; +file_command([$_|Name0], [], St) -> + Name = skip_blanks(Name0), + file_command([], [], St#state{filename=Name}); +file_command(_, _, _) -> + error(missing_space). + +%% (1,$)g/RE/commands - execute commands on all matching lines. +%% (1,$)v/RE/commands - execute commands on all non-matching lines. + +global_command(Cmd, Lines, St) -> + check_global0(true, Cmd, Lines, St). + +vglobal_command(Cmd, Lines, St) -> + check_global0(false, Cmd, Lines, St). + +check_global0(_, _, _, St) when St#state.in_global == true -> + error(nested_globals); +check_global0(Sense, [Sep|Pattern], Lines, St0) -> + {ok, Cmd, St1} = get_pattern(Sep, Pattern, St0), + St2 = mark(Sense, Lines, St1), + do_global_command(Cmd, St2#state{in_global=true}, 0). + +mark(Sense, [First, Last], St0) -> + St1 = move_to(Last, St0), + mark1(Sense, First-1, St1). + +mark1(Sense, First, St) when St#state.dot == First -> + St; +mark1(Sense, First, St) -> + [Line|Prev] = St#state.upto_dot, + NewLine = case match(St) of + true -> Line#line{mark=Sense}; + false -> Line#line{mark=not(Sense)} + end, + mark1(Sense, First, prev_line(St#state{upto_dot=[NewLine|Prev]})). + +do_global_command(Cmd, St0, Matches) -> + case find_mark(St0) of + {ok, St1} -> + St2 = St1#state{input=Cmd++[eof]}, + {ok, St3, Cmd1} = get_line(St2), + St4 = command(Cmd1, St3), + %% XXX There might be several commands. + do_global_command(Cmd, St4, Matches+1); + false when Matches == 0 -> + error(nomatch); + false -> + St0#state{in_global=false, input=[]} + end. + +find_mark(State) -> + find_mark(State#state.lines, State). + +find_mark(0, _State) -> + false; +find_mark(Limit, State) when State#state.dot == 0 -> + find_mark(Limit, next_line(State)); +find_mark(Limit, State) -> + case State#state.upto_dot of + [Line|Prev] when Line#line.mark == true -> + NewLine = Line#line{mark=false}, + {ok, State#state{upto_dot=[NewLine|Prev]}}; + _Other -> + find_mark(Limit-1, wrap_next_line(State)) + end. + +%% h - print info about last error + +help_command([], [], St) -> + case St#state.last_error of + undefined -> + St; + Reason -> + io:put_chars(format_error(Reason)), + io:nl(), + St + end; +help_command(_, _, _) -> + error(garbage_after_command). + +%% H - toggle automatic help mode on/off + +help_always_command([], [], St) -> + Opts = St#state.opts, + case lists:member(help_always, Opts) of + true -> + St#state{opts=Opts--[help_always]}; + false -> + help_command([], [], St), + St#state{opts=[help_always|Opts]} + end. + +%% (.)i - insert text + +insert_command(Rest, [0], State) -> + error(bad_linenum); +insert_command(Rest, [Line], State) -> + append_command(Rest, [Line-1], State). + +%% (.)kx - mark line + +mark_command(_, [0], St) -> + error(bad_linenum); +mark_command([Mark|Rest], [Line], St) when $a =< Mark, Mark =< $z -> + error(not_implemented); +mark_command(_, _, _) -> + error(bad_mark). + +%% (.,.)l - list lines + +list_command(Rest, Lines, St) -> + print([$l|Rest], Lines, St). + +%% (.,.)m - move lines + +move_command(Cmd, [First, Last], St) -> + error(not_implemented). + +%% (.,.)t - copy lines + +transpose_command(Cmd, [First, Last], St) -> + error(not_implemented). + +%% (.,.)n - print lines with line numbers + +number_command(Rest, Lines, St) -> + print([$n|Rest], Lines, St). + +%% (.,.)p - print lines + +print_command(Rest, Lines, St) -> + print([$p|Rest], Lines, St). + +%% P - toggle prompt + +prompt_command([], [], St) -> + Opts = St#state.opts, + case lists:keysearch(prompt, 1, Opts) of + {value, {prompt, ''}} -> + St#state{opts=[{prompt, '*'}|Opts]}; + {value, Value} -> + St#state{opts=[{prompt, ''} | Opts--[Value]]} + end; +prompt_command(_, _, _) -> + error(garbage_after_command). + +%% q - quit editor + +quit_command([], [], _) -> + quit; +quit_command(_, _, _) -> + error(garbage_after_command). + +%% Q - quit editor + +quit_always_command([], [], _) -> + quit; +quit_always_command(_, _, _) -> + error(garbage_after_command). + +%% ($)r file - read file + +read_command([], _, St) when St#state.filename == [] -> + error(bad_filename); +read_command([], [After], St) -> + read(After, St#state.filename, St); +read_command([$ |Name0], [After], St) when St#state.filename == [] -> + Name = skip_blanks(Name0), + read(After, Name, St#state{filename=Name}); +read_command([$ |Name0], [After], St) -> + Name = skip_blanks(Name0), + read(After, Name, St); +read_command(_, _, _) -> + error(missing_space). + +read(After, Name, St0) -> + case file:read_file(Name) of + {ok, Bin} -> + Chars = size(Bin), + St1 = move_to(After, St0), + St2 = insert_line(binary_to_list(Bin), St1), + io:format("~w~n", [Chars]), + St2; + {error, _} -> + error(bad_file) + end. + +%% s/pattern/replacement/gp + +subst_command(_, [0, _], _) -> + error(bad_linenum); +subst_command([$ |Cmd0], [First, Last], St0) -> + error(bad_delimiter); +subst_command([$\n|Cmd0], [First, Last], St0) -> + error(bad_delimiter); +subst_command([Sep|Cmd0], [First, Last], St0) -> + St1 = save_for_undo(St0), + {ok, Cmd1, St2} = get_pattern(Sep, Cmd0, St1), + {ok, Replacement, Cmd2} = get_replacement(Sep, Cmd1), + {ok, Sub, Cmd3} = subst_check_gflag(Cmd2), + St3 = check_trailing_p(Cmd3, St2), + subst_command(Last-First+1, Sub, Replacement, move_to(First-1, St3), nomatch); +subst_command([], _, _) -> + error(bad_delimiter). + +subst_command(0, _, _, _, nomatch) -> + error(nomatch); +subst_command(0, _, _, _, StLast) when record(StLast, state) -> + StLast; +subst_command(Left, Sub, Repl, St0, LastMatch) -> + St1 = next_line(St0), + [Line|_] = St1#state.upto_dot, + case regexp:Sub(Line#line.contents, St1#state.pattern, Repl) of + {ok, _, 0} -> + subst_command(Left-1, Sub, Repl, St1, LastMatch); + {ok, NewContents, _} -> + %% XXX This doesn't work with marks. + St2 = delete_current_line(St1), + St3 = insert_line(NewContents, St2), + subst_command(Left-1, Sub, Repl, St3, St3) + end. + +subst_check_gflag([$g|Cmd]) -> {ok, gsub, Cmd}; +subst_check_gflag(Cmd) -> {ok, sub, Cmd}. + +%% u - undo + +undo_command([], [], St) when St#state.undo == undefined -> + error(bad_undo); +undo_command([], [], #state{undo=Undo}) -> + Undo; +undo_command(_, _, _) -> + error(garbage_after_command). + +%% (1,$)w - write buffer to file + +write_command(Cmd, [First, Last], St) -> + error(not_implemented). + + +%%% Primitive buffer operations. + +print_current(St) -> + [Line|_] = St#state.upto_dot, + Printer = St#state.print, + Printer(Line#line.contents, St). + +delete_current_line(St) when St#state.dot == 0 -> + error(bad_linenum); +delete_current_line(St) -> + Lines = St#state.lines, + [_|Prev] = St#state.upto_dot, + St#state{dot=St#state.dot-1, upto_dot=Prev, lines=Lines-1, modified=true}. + +insert_line(Line, State) -> + insert_line1(Line, State, []). + +insert_line1([$\n|Rest], State, Result) -> + NewState = insert_single_line(lists:reverse(Result, [$\n]), State), + insert_line1(Rest, NewState, []); +insert_line1([C|Rest], State, Result) -> + insert_line1(Rest, State, [C|Result]); +insert_line1([], State, []) -> + State; +insert_line1([], State, Result) -> + insert_single_line(lists:reverse(Result, [$\n]), State). + +insert_single_line(Line0, State) -> + Line = #line{contents=Line0}, + Dot = State#state.dot, + Before = State#state.upto_dot, + Lines = State#state.lines, + %% XXX Avoid updating the record every time. + State#state{dot=Dot+1, upto_dot=[Line|Before], lines=Lines+1, modified=true}. + +move_to(Line, State) when Line < State#state.dot -> + move_to(Line, prev_line(State)); +move_to(Line, State) when State#state.dot < Line -> + move_to(Line, next_line(State)); +move_to(Line, State) when Line == State#state.dot -> + State. + +prev_line(State) -> + Dot = State#state.dot, + Before = State#state.upto_dot, + After = State#state.after_dot, + State#state{dot=Dot-1, upto_dot=tl(Before), after_dot=[hd(Before)|After]}. + +next_line(State) -> + Dot = State#state.dot, + Before = State#state.upto_dot, + After = State#state.after_dot, + State#state{dot=Dot+1, upto_dot=[hd(After)|Before], after_dot=tl(After)}. + +wrap_next_line(State) when State#state.dot == State#state.lines -> + move_to(1, State); +wrap_next_line(State) -> + next_line(State). + + +%%% Utilities. + +get_pattern(End, Cmd, State) -> + get_pattern(End, Cmd, State, []). + +get_pattern(End, [End|Rest], State, []) when State#state.pattern /= undefined -> + {ok, Rest, State}; +get_pattern(End, [End|Rest], State, Result) -> + case regexp:parse(lists:reverse(Result)) of + {error, _} -> + error(bad_pattern); + {ok, Re} -> + {ok, Rest, State#state{pattern=Re}} + end; +get_pattern(End, [C|Rest], State, Result) -> + get_pattern(End, Rest, State, [C|Result]); +get_pattern(End, [], State, Result) -> + get_pattern(End, [End], State, Result). + +get_replacement(End, Cmd) -> + get_replacement(End, Cmd, []). + +get_replacement(End, [End|Rest], Result) -> + {ok, lists:reverse(Result), Rest}; +get_replacement(End, [$\\, $&|Rest], Result) -> + get_replacement(End, Rest, [$&, $\\|Result]); +get_replacement(End, [$\\, C|Rest], Result) -> + get_replacement(End, Rest, [C|Result]); +get_replacement(End, [C|Rest], Result) -> + get_replacement(End, Rest, [C|Result]); +get_replacement(End, [], Result) -> + get_replacement(End, [End], Result). + +check_trailing_p([$l], St) -> + St#state{print=fun(Line, _) -> lister(Line, 0) end}; +check_trailing_p([$n], St) -> + St#state{print=fun numberer/2}; +check_trailing_p([$p], St) -> + St#state{print=fun(Line, _) -> io:put_chars(Line) end}; +check_trailing_p([], State) -> + State; +check_trailing_p(Other, State) -> + error(garbage_after_command). + +error(Reason) -> + throw({error, Reason}). + +match(State) when State#state.dot == 0 -> + false; +match(State) -> + [Line|_] = State#state.upto_dot, + Re = State#state.pattern, + case regexp:first_match(Line#line.contents, Re) of + {match, _, _} -> true; + nomatch -> false + end. + +skip_blanks([$ |Rest]) -> + skip_blanks(Rest); +skip_blanks(Rest) -> + Rest. + +print(Rest, [Line], St0) when Line > 0 -> + St1 = check_trailing_p(Rest, St0), + print(Line, move_to(Line-1, St1)); +print(Rest, [First, Last], St0) when First > 0 -> + St1 = check_trailing_p(Rest, St0), + print(Last, move_to(First-1, St1)). + +print(Last, St) when St#state.dot == Last -> + St#state{print=false}; +print(Last, St0) -> + St1 = next_line(St0), + print_current(St1), + print(Last, St1). + +lister(Rest, 64) -> + io:put_chars("\\\n"), + lister(Rest, 0); +lister([C|Rest], Num) -> + list_char(C), + lister(Rest, Num+1); +lister([], _) -> + ok. + +list_char($\t) -> + io:put_chars("\\t"); +list_char($\n) -> + io:put_chars("$\n"); +list_char(C) -> + io:put_chars([C]). + +numberer(Line, St) -> + io:format("~w\t~s", [St#state.dot, Line]). + +save_for_undo(St) -> + St#state{undo=St#state{undo=undefined, print=false}}. + +save_for_undo(St, OldSt) -> + St#state{undo=OldSt#state{undo=undefined, print=false}}. |