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authorBjörn Gustavsson <[email protected]>2010-01-19 11:34:56 +0000
committerErlang/OTP <[email protected]>2010-01-19 13:01:29 +0100
commit74d7b1b942c6f1d984e263f6675a9423197a3215 (patch)
tree4644ffbb46b3f166507ffa8739e5ecbfccd4aba7 /lib/tools/test/eprof_SUITE_data/eed.erl
parent81f4b1f7f453e1242d7f81ef2347230a9ff3fb0f (diff)
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Add test suite for the tools application
Diffstat (limited to 'lib/tools/test/eprof_SUITE_data/eed.erl')
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diff --git a/lib/tools/test/eprof_SUITE_data/eed.erl b/lib/tools/test/eprof_SUITE_data/eed.erl
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+%%%----------------------------------------------------------------------
+%%% 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}}.