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-
- unit YaccMsgs;
-
- (* 2-5-91 AG *)
-
- (* Copyright (c) 1990,91 by Albert Graef, Schillerstr. 18,
- 6509 Schornsheim/Germany
- All rights reserved *)
-
- interface
-
- (* TP Yacc message and error handling module 2-5-91 AG
- Note: this module should be USEd by any module using the heap during
- initialization, since it installs a heap error handler (which
- terminates the program with fatal error `memory overflow'). *)
-
- var errors, warnings : Integer;
- (* - current error and warning count *)
- procedure error(msg : String);
- (* - print current input line and error message (pos denotes position to
- mark in source file line) *)
- procedure warning(msg : String);
- (* - print warning message *)
- procedure fatal(msg : String);
- (* - writes a fatal error message, erases Yacc output file and terminates
- the program with errorlevel 1 *)
-
- const
-
- (* sign-on and usage message: *)
-
- sign_on = 'TP Yacc Version 3.0a [May 92], Copyright (c) 1990-92 Albert Graef';
- usage = 'Usage: YACC [options] yacc-file[.Y] [output-file[.PAS]]';
- options = 'Options: /v verbose, /d debug';
-
- (* command line error messages: *)
-
- invalid_option = 'invalid option ';
- illegal_no_args = 'illegal number of parameters';
-
- (* syntax errors: *)
-
- open_comment_at_eof = '101: open comment at end of file';
- missing_string_terminator = '102: missing string terminator';
- rcurl_expected = '103: %} expected';
- rbrace_expected = '104: } expected';
- rangle_expected = '105: > expected';
- ident_expected = '106: identifier expected';
- error_in_def = '110: error in definition';
- error_in_rule = '111: error in rule';
- syntax_error = '112: syntax error';
- unexpected_eof = '113: unexpected end of file';
-
- (* semantic errors: *)
-
- nonterm_expected = '201: nonterminal expected';
- literal_expected = '202: literal expected';
- double_tokennum_def = '203: literal already defined';
- unknown_identifier = '204: unknown identifier';
- type_error = '205: type error';
- range_error = '206: range error';
- empty_grammar = '207: empty grammar?';
-
- (* fatal errors: *)
-
- cannot_open_file = 'FATAL: cannot open file ';
- write_error = 'FATAL: write error';
- mem_overflow = 'FATAL: memory overflow';
- intset_overflow = 'FATAL: integer set overflow';
- sym_table_overflow = 'FATAL: symbol table overflow';
- nt_table_overflow = 'FATAL: nonterminal table overflow';
- lit_table_overflow = 'FATAL: literal table overflow';
- type_table_overflow = 'FATAL: type table overflow';
- prec_table_overflow = 'FATAL: precedence table overflow';
- rule_table_overflow = 'FATAL: rule table overflow';
- state_table_overflow = 'FATAL: state table overflow';
- item_table_overflow = 'FATAL: item table overflow';
- trans_table_overflow = 'FATAL: transition table overflow';
- redn_table_overflow = 'FATAL: reduction table overflow';
-
- implementation
-
- uses YaccBase;
-
- procedure position(var f : Text;
- lineNo : integer;
- line : String;
- pos : integer);
- (* writes a position mark of the form
- lineno: line
- ^
- on f with the caret ^ positioned at pos in line
- a subsequent write starts at the next line, indented with tab *)
- var
- line1, line2 : String;
- begin
- (* this hack handles tab characters in line: *)
- line1 := intStr(lineNo)+': '+line;
- line2 := blankStr(intStr(lineNo)+': '+copy(line, 1, pos-1));
- writeln(f, line1);
- writeln(f, line2, '^');
- write(f, tab)
- end(*position*);
-
- procedure error(msg : String);
- begin
- inc(errors);
- writeln;
- position(output, lno, line, cno-tokleng);
- writeln(msg);
- writeln(yylst);
- position(yylst, lno, line, cno-tokleng);
- writeln(yylst, msg);
- if ioresult<>0 then ;
- end(*error*);
-
- procedure warning(msg : String);
- begin
- inc(warnings);
- writeln;
- position(output, lno, line, cno-tokleng);
- writeln(msg);
- writeln(yylst);
- position(yylst, lno, line, cno-tokleng);
- writeln(yylst, msg);
- if ioresult<>0 then ;
- end(*warning*);
-
- procedure fatal(msg : String);
- begin
- writeln;
- writeln(msg);
- close(yyin); close(yyout); close(yylst); erase(yyout);
- halt(1)
- end(*fatal*);
-
- {$F+}
- function heapErrorHandler ( size : Word ) : Integer;
- {$F-}
- begin
- if size>0 then
- fatal(mem_overflow) (* never returns *)
- else
- heapErrorHandler := 1
- end(*heapErrorHandler*);
-
- begin
- errors := 0; warnings := 0;
- (* install heap error handler: *)
- heapError := @heapErrorHandler;
- end(*YaccMsgs*).
-