%-----------------------------------------------------------------------------% % vim: ft=mercury ts=4 sw=4 et %-----------------------------------------------------------------------------% % Copyright (C) 1997-2006 The University of Melbourne. % This file may only be copied under the terms of the GNU General % Public License - see the file COPYING in the Mercury distribution. %-----------------------------------------------------------------------------% % % File: error_util.m. % Main author: zs. % % This module contains code that can be helpful in the formatting of % error messages. % % Given a context, a starting indentation level and a list of words, % print an error message that looks like this: % % module.m:10: first line of error message blah blah blah % module.m:10: second line of error message blah blah blah % module.m:10: third line of error message blah blah blah % % The words will be packed into lines as tightly as possible, % with spaces between each pair of words, subject to the constraints % that every line starts with a context, followed by Indent+1 spaces % on the first line and Indent+3 spaces on later lines, and that every % line contains at most 79 characters (unless a long single word % forces the line over this limit). % % The caller supplies the list of words to be printed in the form % of a list of error message components. Each component may specify % a string to printed exactly as it is, or it may specify a string % containing a list of words, which may be broken at white space. % %-----------------------------------------------------------------------------% :- module parse_tree.error_util. :- interface. :- import_module mdbcomp.prim_data. :- import_module parse_tree.prog_data. :- import_module bool. :- import_module io. :- import_module list. :- import_module maybe. %-----------------------------------------------------------------------------% :- type format_component ---> fixed(string) % This string should appear in the output % in one piece, as it is. ; prefix(string) % This string should appear in the output % in one piece, as it is, inserted directly % before the next format_component, without % any intervening space. ; suffix(string) % This string should appear in the output % in one piece, as it is, appended directly % after the previous format_component, without % any intervening space. ; words(string) % This string contains words separated by % white space. The words should appear in % the output in the given order, but the % white space may be rearranged and line % breaks may be inserted. ; sym_name(sym_name) % The output should contain the string form of % the sym_name, surrounded by `' quotes. ; sym_name_and_arity(sym_name_and_arity) % The output should contain the string form of % the sym_name, followed by '/' and the arity, % all surrounded by `' quotes. ; pred_or_func(pred_or_func) % Output the string "predicate" or "function" % as appropriate. ; simple_call_id(simple_call_id) % Output the identity of the given call. ; nl % Insert a line break if there has been text % output since the last line break. ; nl_indent_delta(int) % Act as nl, but also add the given integer % (which should be a small positive or negative % integer) to the current indent level. ; quote(string). % Act as fixed, but surround the string by `' % quotes. :- type format_components == list(format_component). % Wrap words() around a string. % :- func string_to_words_piece(string) = format_component. % Convert a list of strings into a list of format_components % separated by commas, with the last two elements separated by `and'. % :- func list_to_pieces(list(string)) = list(format_component). % Convert a list of lists of format_components into a list of % format_components separated by commas, with the last two elements % separated by `and'. % :- func component_lists_to_pieces(list(list(format_component))) = list(format_component). % Convert a list of format_components into a list of format_components % separated by commas, with the last two elements separated by `and'. % :- func component_list_to_pieces(list(format_component)) = list(format_component). % component_list_to_line_pieces(Lines, Final): % % Convert Lines, a list of lines (each given by a list of format_components % *without* a final nl) into a condensed list of format_components % in which adjacent lines are separated by commas and newlines. % What goes between the last line and the newline ending is not % a comma but the value of Final. % :- func component_list_to_line_pieces(list(list(format_component)), list(format_component)) = list(format_component). % choose_number(List, Singular, Plural) = Form % % Choose between a singular version and a plural version of something, % based on the length of a list. Chooses the plural if the list is empty. % :- func choose_number(list(T), U, U) = U. % Display the given error message, without a context and with standard % indentation. % :- pred write_error_pieces_plain(list(format_component)::in, io::di, io::uo) is det. % write_error_plain_with_progname(ProgName, Msg): % % Display Msg as the error string, with ProgName as a context % and with standard indentation. % :- pred write_error_plain_with_progname(string::in, string::in, io::di, io::uo) is det. % write_error_pieces(Context, Indent, Components): % % Display `Components' as the error message, with % `Context' as a context and indent by `Indent'. % :- pred write_error_pieces(prog_context::in, int::in, list(format_component)::in, io::di, io::uo) is det. % Display the given error message, but indent the first line. % This is useful when adding extra lines to an already displayed message. % :- pred write_error_pieces_not_first_line(prog_context::in, int::in, list(format_component)::in, io::di, io::uo) is det. % Display the given error message. The bool is true iff % this is the first line. % :- pred write_error_pieces_maybe_first_line(bool::in, prog_context::in, int::in, list(format_component)::in, io::di, io::uo) is det. :- pred write_error_pieces_maybe_with_context(maybe(prog_context)::in, int::in, list(format_component)::in, io::di, io::uo) is det. :- func error_pieces_to_string(list(format_component)) = string. % An error_msg_spec represents a call write_error_pieces. A call to % write_error_specs will invoke write_error_specs for each element of the % list. Each invocation will use the context given in the error_msg_spec. % The first call will use an indent of zero. By default, all later calls % will use the indent that would be required by the not_first_line variant % of write_error_pieces. However, the first of an error_msg_spec can be % treated as a first line if the treat_as_first_call field is set to yes, % and each call to write_error_pieces will be additionally indented % by the number of levels indicated by the extra_indent field. :- type error_msg_spec ---> error_msg_spec( spec_treat_as_first :: bool, spec_context :: prog_context, spec_extra_indent :: int, spec_pieces :: list(format_component) ). % In some circumstances, we need more descriptive power than an % error_msg_spec provides. % % The anything alternative allows the caller to specify an arbitrary thing % to be printed at any point in the sequence. Since things printed this way % aren't formatted as error messages should be (context at start etc), this % capability is intended only for messages that help debug the compiler % itself. :- type extended_error_msg_spec ---> plain_spec( error_msg_spec ) ; anything( spec_write_anything :: pred(io, io) ). :- inst extended_error_msg_spec == bound( plain_spec(ground) ; anything(pred(di, uo) is det) ). :- inst extended_error_msg_specs == list_skel(extended_error_msg_spec). :- pred extend_specs(list(error_msg_spec)::in, list(extended_error_msg_spec)::out(extended_error_msg_specs)) is det. :- pred add_to_spec_at_end(list(format_component)::in, error_msg_spec::in, error_msg_spec::out) is det. :- pred write_error_specs(list(error_msg_spec)::in, io::di, io::uo) is det. :- pred write_extended_error_specs( list(extended_error_msg_spec)::in(extended_error_msg_specs), io::di, io::uo) is det. :- func describe_sym_name(sym_name) = string. :- func describe_sym_name_and_arity(sym_name_and_arity) = string. :- func pred_or_func_to_string(pred_or_func) = string. % Put `' quotes around the given string. % :- func add_quotes(string) = string. % Ensure that the first character of the input string is not a lower case % letter. % :- func capitalize(string) = string. % report_error_num_args(MaybePredOrFunc, Arity, CorrectArities). % % Write "wrong number of arguments (; should be )", % adjusting `Arity' and `CorrectArities' if `MaybePredOrFunc' is % `yes(function)'. % :- pred report_error_num_args(maybe(pred_or_func)::in, int::in, list(int)::in, io::di, io::uo) is det. % Report a warning, and set the exit status to error if the % --halt-at-warn option is set. % :- pred report_warning(prog_context::in, int::in, list(format_component)::in, io::di, io::uo) is det. %-----------------------------------------------------------------------------% %-----------------------------------------------------------------------------% :- implementation. :- import_module parse_tree.prog_out. :- import_module parse_tree.prog_util. :- import_module libs.compiler_util. :- import_module libs.globals. :- import_module libs.options. :- import_module char. :- import_module int. :- import_module list. :- import_module string. :- import_module term. %-----------------------------------------------------------------------------% add_to_spec_at_end(NewPieces, Spec0, Spec) :- Spec0 = error_msg_spec(First, Context, ExtraIndent, Pieces0), Pieces = Pieces0 ++ NewPieces, Spec = error_msg_spec(First, Context, ExtraIndent, Pieces). write_error_specs(Specs, !IO) :- extend_specs(Specs, ExtendedSpecs), do_write_error_specs(ExtendedSpecs, yes, !IO). write_extended_error_specs(ExtendedSpecs, !IO) :- do_write_error_specs(ExtendedSpecs, yes, !IO). extend_specs([], []). extend_specs([Spec | Specs], [plain_spec(Spec) | ExtendedSpecs]) :- extend_specs(Specs, ExtendedSpecs). :- pred do_write_error_specs( list(extended_error_msg_spec)::in(extended_error_msg_specs), bool::in, io::di, io::uo) is det. do_write_error_specs([], _First, !IO). do_write_error_specs([Spec | Specs], !.First, !IO) :- ( Spec = plain_spec(PlainSpec), PlainSpec = error_msg_spec(TreatAsFirst, Context, ExtraIndent, Pieces), ( TreatAsFirst = yes, !:First = yes ; TreatAsFirst = no ), Indent = ExtraIndent * indent_increment, ( !.First = yes, write_error_pieces(Context, Indent, Pieces, !IO) ; !.First = no, write_error_pieces_not_first_line(Context, Indent, Pieces, !IO) ), !:First = no ; Spec = anything(Pred), Pred(!IO) ), do_write_error_specs(Specs, !.First, !IO). string_to_words_piece(Str) = words(Str). list_to_pieces([]) = []. list_to_pieces([Elem]) = [words(Elem)]. list_to_pieces([Elem1, Elem2]) = [fixed(Elem1), words("and"), fixed(Elem2)]. list_to_pieces([Elem1, Elem2, Elem3 | Elems]) = [fixed(Elem1 ++ ",") | list_to_pieces([Elem2, Elem3 | Elems])]. component_lists_to_pieces([]) = []. component_lists_to_pieces([Comps]) = Comps. component_lists_to_pieces([Comps1, Comps2]) = Comps1 ++ [words("and")] ++ Comps2. component_lists_to_pieces([Comps1, Comps2, Comps3 | Comps]) = Comps1 ++ [suffix(",")] ++ component_lists_to_pieces([Comps2, Comps3 | Comps]). component_list_to_pieces([]) = []. component_list_to_pieces([Comp]) = [Comp]. component_list_to_pieces([Comp1, Comp2]) = [Comp1, words("and"), Comp2]. component_list_to_pieces([Comp1, Comp2, Comp3 | Comps]) = [Comp1, suffix(",")] ++ component_list_to_pieces([Comp2, Comp3 | Comps]). component_list_to_line_pieces([], _) = []. component_list_to_line_pieces([Comps], Final) = Comps ++ Final ++ [nl]. component_list_to_line_pieces([Comps1, Comps2 | CompLists], Final) = Comps1 ++ [suffix(","), nl] ++ component_list_to_line_pieces([Comps2 | CompLists], Final). choose_number([], _Singular, Plural) = Plural. choose_number([_], Singular, _Plural) = Singular. choose_number([_, _ | _], _Singular, Plural) = Plural. write_error_pieces_plain(Components, !IO) :- write_error_pieces_maybe_with_context(yes, no, 0, Components, !IO). write_error_plain_with_progname(ProgName, Msg, !IO) :- write_error_pieces_plain([fixed(ProgName ++ ":"), words(Msg)], !IO). write_error_pieces(Context, Indent, Components, !IO) :- write_error_pieces_maybe_with_context(yes, yes(Context), Indent, Components, !IO). write_error_pieces_not_first_line(Context, Indent, Components, !IO) :- write_error_pieces_maybe_with_context(no, yes(Context), Indent, Components, !IO). write_error_pieces_maybe_first_line(IsFirst, Context, Indent, Components, !IO) :- ( IsFirst = yes, write_error_pieces(Context, Indent, Components, !IO) ; IsFirst = no, write_error_pieces_not_first_line(Context, Indent, Components, !IO) ). write_error_pieces_maybe_with_context(MaybeContext, Indent, Components, !IO) :- write_error_pieces_maybe_with_context(yes, MaybeContext, Indent, Components, !IO). :- pred write_error_pieces_maybe_with_context(bool::in, maybe(prog_context)::in, int::in, list(format_component)::in, io::di, io::uo) is det. write_error_pieces_maybe_with_context(IsFirst, MaybeContext, FixedIndent, Components, !IO) :- ( % The fixed characters at the start of the line are: % filename % : % line number (min 3 chars) % : % space % indent ( MaybeContext = yes(Context), term.context_file(Context, FileName), term.context_line(Context, LineNumber), string.length(FileName, FileNameLength), string.int_to_string(LineNumber, LineNumberStr), string.length(LineNumberStr, LineNumberStrLength0), ( LineNumberStrLength0 < 3 -> LineNumberStrLength = 3 ; LineNumberStrLength = LineNumberStrLength0 ), ContextLength = FileNameLength + 1 + LineNumberStrLength + 2 ; MaybeContext = no, ContextLength = 0 ), convert_components_to_paragraphs(Components, Paragraphs), FirstIndent = (IsFirst = yes -> 0 ; 1), Remain = 79 - (ContextLength + FixedIndent), group_words(IsFirst, FirstIndent, Paragraphs, Remain, Lines) ), write_lines(Lines, MaybeContext, FixedIndent, !IO). :- func indent_increment = int. indent_increment = 2. :- pred write_lines(list(line)::in, maybe(prog_context)::in, int::in, io::di, io::uo) is det. write_lines([], _, _, !IO). write_lines([Line | Lines], MaybeContext, FixedIndent, !IO) :- ( MaybeContext = yes(Context), prog_out.write_context(Context, !IO) ; MaybeContext = no ), Line = line(LineIndent, LineWords), Indent = FixedIndent + LineIndent * indent_increment, string.pad_left("", ' ', Indent, IndentStr), io.write_string(IndentStr, !IO), write_line(LineWords, !IO), write_lines(Lines, MaybeContext, FixedIndent, !IO). :- pred write_line(list(string)::in, io::di, io::uo) is det. write_line([], !IO). write_line([Word | Words], !IO) :- io.write_string(Word, !IO), write_line_rest(Words, !IO), io.write_char('\n', !IO). :- pred write_line_rest(list(string)::in, io::di, io::uo) is det. write_line_rest([], !IO). write_line_rest([Word | Words], !IO) :- io.write_char(' ', !IO), io.write_string(Word, !IO), write_line_rest(Words, !IO). error_pieces_to_string([]) = "". error_pieces_to_string([Component | Components]) = Str :- TailStr = error_pieces_to_string(Components), ( Component = fixed(Word), Str = join_string_and_tail(Word, Components, TailStr) ; Component = prefix(Word), Str = Word ++ TailStr ; Component = suffix(Word), Str = join_string_and_tail(Word, Components, TailStr) ; Component = words(Words), Str = join_string_and_tail(Words, Components, TailStr) ; Component = sym_name(SymName), Word = sym_name_to_word(SymName), Str = join_string_and_tail(Word, Components, TailStr) ; Component = sym_name_and_arity(SymNameAndArity), Word = sym_name_and_arity_to_word(SymNameAndArity), Str = join_string_and_tail(Word, Components, TailStr) ; Component = pred_or_func(PredOrFunc), Word = pred_or_func_to_string(PredOrFunc), Str = join_string_and_tail(Word, Components, TailStr) ; Component = simple_call_id(SimpleCallId), Word = simple_call_id_to_string(SimpleCallId), Str = join_string_and_tail(Word, Components, TailStr) ; Component = nl, Str = "\n" ++ TailStr ; Component = nl_indent_delta(_), % There is nothing we can do about the indent delta. Str = "\n" ++ TailStr ; Component = quote(Word), Str = join_string_and_tail(add_quotes(Word), Components, TailStr) ). :- func join_string_and_tail(string, list(format_component), string) = string. join_string_and_tail(Word, Components, TailStr) = Str :- ( TailStr = "" -> Str = Word ; Components = [suffix(_) | _] -> Str = Word ++ TailStr ; Str = Word ++ " " ++ TailStr ). %----------------------------------------------------------------------------% :- type paragraph ---> paragraph( list(string), % The list of words to print in the paragraph. % It should not be empty. int % The indent delta to apply for the next % paragraph. ). :- pred convert_components_to_paragraphs(list(format_component)::in, list(paragraph)::out) is det. convert_components_to_paragraphs(Components, Paras) :- convert_components_to_paragraphs_acc(Components, [], [], Paras). :- type word ---> word(string) ; prefix_word(string) ; suffix_word(string). :- pred convert_components_to_paragraphs_acc(list(format_component)::in, list(word)::in, list(paragraph)::in, list(paragraph)::out) is det. convert_components_to_paragraphs_acc([], RevWords0, !Paras) :- Strings = rev_words_to_strings(RevWords0), list.reverse([paragraph(Strings, 0) | !.Paras], !:Paras). convert_components_to_paragraphs_acc([Component | Components], RevWords0, !Paras) :- ( Component = fixed(Word), RevWords1 = [word(Word) | RevWords0] ; Component = prefix(Word), RevWords1 = [prefix_word(Word) | RevWords0] ; Component = suffix(Word), RevWords1 = [suffix_word(Word) | RevWords0] ; Component = words(WordsStr), break_into_words(WordsStr, RevWords0, RevWords1) ; Component = sym_name(SymName), RevWords1 = [word(sym_name_to_word(SymName)) | RevWords0] ; Component = sym_name_and_arity(SymNameAndArity), Word = sym_name_and_arity_to_word(SymNameAndArity), RevWords1 = [word(Word) | RevWords0] ; Component = pred_or_func(PredOrFunc), Word = pred_or_func_to_string(PredOrFunc), RevWords1 = [word(Word) | RevWords0] ; Component = simple_call_id(SimpleCallId), WordsStr = simple_call_id_to_string(SimpleCallId), break_into_words(WordsStr, RevWords0, RevWords1) ; Component = nl, Strings = rev_words_to_strings(RevWords0), list.cons(paragraph(Strings, 0), !Paras), RevWords1 = [] ; Component = nl_indent_delta(IndentDelta), Strings = rev_words_to_strings(RevWords0), list.cons(paragraph(Strings, IndentDelta), !Paras), RevWords1 = [] ; Component = quote(Word), RevWords1 = [word(add_quotes(Word)) | RevWords0] ), convert_components_to_paragraphs_acc(Components, RevWords1, !Paras). :- type plain_or_prefix ---> plain(string) ; prefix(string). :- func rev_words_to_strings(list(word)) = list(string). rev_words_to_strings(RevWords) = Strings :- PorPs = list.reverse(rev_words_to_rev_plain_or_prefix(RevWords)), Strings = join_prefixes(PorPs). :- func rev_words_to_rev_plain_or_prefix(list(word)) = list(plain_or_prefix). rev_words_to_rev_plain_or_prefix([]) = []. rev_words_to_rev_plain_or_prefix([Word | Words]) = PorPs :- ( Word = word(String), PorPs = [plain(String) | rev_words_to_rev_plain_or_prefix(Words)] ; Word = prefix_word(Prefix), PorPs = [prefix(Prefix) | rev_words_to_rev_plain_or_prefix(Words)] ; Word = suffix_word(Suffix), ( Words = [], PorPs = [plain(Suffix)] ; Words = [word(String) | Tail], PorPs = [plain(String ++ Suffix) | rev_words_to_rev_plain_or_prefix(Tail)] ; Words = [prefix_word(Prefix) | Tail], % Convert the prefix/suffix combination into a plain word. % We could convert it into a prefix, but since prefix/suffix % combinations shouldn't come up at all, what we do here probably % doesn't matter. PorPs = [plain(Prefix ++ Suffix) | rev_words_to_rev_plain_or_prefix(Tail)] ; Words = [suffix_word(MoreSuffix) | Tail], PorPs = rev_words_to_rev_plain_or_prefix( [suffix_word(MoreSuffix ++ Suffix) | Tail]) ) ). :- func join_prefixes(list(plain_or_prefix)) = list(string). join_prefixes([]) = []. join_prefixes([Head | Tail]) = Strings :- TailStrings = join_prefixes(Tail), ( Head = plain(String), Strings = [String | TailStrings] ; Head = prefix(Prefix), ( TailStrings = [First | Later], Strings = [Prefix ++ First | Later] ; TailStrings = [], Strings = [Prefix | TailStrings] ) ). :- func sym_name_to_word(sym_name) = string. sym_name_to_word(SymName) = "`" ++ SymStr ++ "'" :- sym_name_to_string(SymName, SymStr). :- func sym_name_and_arity_to_word(sym_name_and_arity) = string. sym_name_and_arity_to_word(SymName / Arity) = "`" ++ sym_name_to_string(SymName) ++ "'" ++ "/" ++ int_to_string(Arity). :- pred break_into_words(string::in, list(word)::in, list(word)::out) is det. break_into_words(String, Words0, Words) :- break_into_words_from(String, 0, Words0, Words). :- pred break_into_words_from(string::in, int::in, list(word)::in, list(word)::out) is det. break_into_words_from(String, Cur, Words0, Words) :- ( find_word_start(String, Cur, Start) -> find_word_end(String, Start, End), Length = End - Start + 1, string.substring(String, Start, Length, WordStr), Next = End + 1, break_into_words_from(String, Next, [word(WordStr) | Words0], Words) ; Words = Words0 ). :- pred find_word_start(string::in, int::in, int::out) is semidet. find_word_start(String, Cur, WordStart) :- string.index(String, Cur, Char), ( char.is_whitespace(Char) -> Next = Cur + 1, find_word_start(String, Next, WordStart) ; WordStart = Cur ). :- pred find_word_end(string::in, int::in, int::out) is det. find_word_end(String, Cur, WordEnd) :- Next = Cur + 1, ( string.index(String, Next, Char) -> ( char.is_whitespace(Char) -> WordEnd = Cur ; find_word_end(String, Next, WordEnd) ) ; WordEnd = Cur ). %----------------------------------------------------------------------------% :- type line ---> line( int, % Indent level; multiply by indent_increment % to get number of spaces of indentation. list(string) % The words on the line. ). % Groups the given words into lines. The first line can have up to Max % characters on it; the later lines (if any) up to Max-2 characters. % The given list of paragraphs must be nonempty, since we always return % at least one line. % :- pred group_words(bool::in, int::in, list(paragraph)::in, int::in, list(line)::out) is det. group_words(IsFirst, CurIndent, Paras, Max, Lines) :- ( Paras = [], Lines = [] ; Paras = [FirstPara | LaterParas], FirstPara = paragraph(FirstParaWords, FirstIndentDelta), ( IsFirst = yes, RestIndent = CurIndent + 1 ; IsFirst = no, RestIndent = CurIndent ), NextIndent = RestIndent + FirstIndentDelta, ( FirstParaWords = [], group_words(IsFirst, NextIndent, LaterParas, Max, Lines) ; FirstParaWords = [FirstWord | LaterWords], get_line_of_words(FirstWord, LaterWords, CurIndent, Max, LineWords, RestWords), CurLine = line(CurIndent, LineWords), group_nonfirst_line_words(RestWords, RestIndent, Max, ParaRestLines), ParaLines = [CurLine | ParaRestLines], group_words(no, NextIndent, LaterParas, Max, RestLines), Lines = ParaLines ++ RestLines ) ). :- pred group_nonfirst_line_words(list(string)::in, int::in, int::in, list(line)::out) is det. group_nonfirst_line_words(Words, Indent, Max, Lines) :- ( Words = [], Lines = [] ; Words = [FirstWord | LaterWords], get_line_of_words(FirstWord, LaterWords, Indent, Max, LineWords, RestWords), Line = line(Indent, LineWords), group_nonfirst_line_words(RestWords, Indent, Max, RestLines), Lines = [Line | RestLines] ). :- pred get_line_of_words(string::in, list(string)::in, int::in, int::in, list(string)::out, list(string)::out) is det. get_line_of_words(FirstWord, LaterWords, Indent, Max, Line, RestWords) :- string.length(FirstWord, FirstWordLen), Avail = Max - Indent * indent_increment, get_later_words(LaterWords, FirstWordLen, Avail, [FirstWord], Line, RestWords). :- pred get_later_words(list(string)::in, int::in, int::in, list(string)::in, list(string)::out, list(string)::out) is det. get_later_words([], _, _, Line, Line, []). get_later_words([Word | Words], OldLen, Avail, Line0, Line, RestWords) :- string.length(Word, WordLen), NewLen = OldLen + 1 + WordLen, ( NewLen =< Avail -> list.append(Line0, [Word], Line1), get_later_words(Words, NewLen, Avail, Line1, Line, RestWords) ; Line = Line0, RestWords = [Word | Words] ). %-----------------------------------------------------------------------------% describe_sym_name_and_arity(SymName / Arity) = string.append_list(["`", SymNameString, "/", string.int_to_string(Arity), "'"]) :- sym_name_to_string(SymName, SymNameString). describe_sym_name(SymName) = string.append_list(["`", SymNameString, "'"]) :- sym_name_to_string(SymName, SymNameString). pred_or_func_to_string(predicate) = "predicate". pred_or_func_to_string(function) = "function". add_quotes(Str) = "`" ++ Str ++ "'". capitalize(Str0) = Str :- Chars0 = string.to_char_list(Str0), ( Chars0 = [Char0 | TailChars], char.is_lower(Char0), Char = char.to_upper(Char0) -> Chars = [Char | TailChars], Str = string.from_char_list(Chars) ; Str = Str0 ). %-----------------------------------------------------------------------------% report_error_num_args(MaybePredOrFunc, Arity0, Arities0, !IO) :- % Adjust arities for functions. ( MaybePredOrFunc = yes(function) -> adjust_func_arity(function, Arity, Arity0), list.map( (pred(OtherArity0::in, OtherArity::out) is det :- adjust_func_arity(function, OtherArity, OtherArity0) ), Arities0, Arities) ; Arity = Arity0, Arities = Arities0 ), io.write_string("wrong number of arguments (", !IO), io.write_int(Arity, !IO), io.write_string("; should be ", !IO), report_error_right_num_args(Arities, !IO), io.write_string(")", !IO). :- pred report_error_right_num_args(list(int)::in, io::di, io::uo) is det. report_error_right_num_args([], !IO). report_error_right_num_args([Arity | Arities], !IO) :- io.write_int(Arity, !IO), ( Arities = [], true ; Arities = [_], io.write_string(" or ", !IO) ; Arities = [_, _ | _], io.write_string(", ", !IO) ), report_error_right_num_args(Arities, !IO). report_warning(Context, Indent, Components, !IO) :- record_warning(!IO), write_error_pieces(Context, Indent, Components, !IO). %-----------------------------------------------------------------------------% :- func this_file = string. this_file = "error_util.m". %-----------------------------------------------------------------------------% :- end_module error_util. %-----------------------------------------------------------------------------%