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lex.h
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1997-08-20
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/*
Copyright (C) 1996 John W. Eaton
This file is part of Octave.
Octave 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.
Octave 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 Octave; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#if !defined (octave_lex_h)
#define octave_lex_h 1
// Arrange to get input via readline.
#ifdef YY_INPUT
#undef YY_INPUT
#endif
#define YY_INPUT(buf,result,max_size) \
if ((result = octave_read (buf, max_size)) < 0) \
YY_FATAL_ERROR ("octave_read () in flex scanner failed");
// Try to avoid crashing out completely on fatal scanner errors.
#ifdef YY_FATAL_ERROR
#undef YY_FATAL_ERROR
#endif
#define YY_FATAL_ERROR(msg) \
do \
{ \
error (msg); \
jump_to_top_level (); \
} \
while (0)
#define TOK_RETURN(tok) \
do \
{ \
current_input_column += yyleng; \
lexer_flags.quote_is_transpose = 0; \
lexer_flags.cant_be_identifier = 0; \
lexer_flags.convert_spaces_to_comma = 1; \
return (tok); \
} \
while (0)
#define TOK_PUSH_AND_RETURN(name,tok) \
do \
{ \
yylval.tok_val = new token (name, input_line_number, \
current_input_column); \
token_stack.push (yylval.tok_val); \
TOK_RETURN (tok); \
} \
while (0)
#define BIN_OP_RETURN(tok,convert) \
do \
{ \
yylval.tok_val = new token (input_line_number, current_input_column); \
token_stack.push (yylval.tok_val); \
current_input_column += yyleng; \
lexer_flags.quote_is_transpose = 0; \
lexer_flags.cant_be_identifier = 0; \
lexer_flags.convert_spaces_to_comma = convert; \
return (tok); \
} \
while (0)
// XXX FIXME XXX -- these input buffer things should be members of an
// parser input stream class.
typedef struct yy_buffer_state *YY_BUFFER_STATE;
// Associate a buffer with a new file to read.
extern YY_BUFFER_STATE create_buffer (FILE *f);
// Report the current buffer.
extern YY_BUFFER_STATE current_buffer (void);
// Connect to new buffer buffer.
extern void switch_to_buffer (YY_BUFFER_STATE buf);
// Delete a buffer.
extern void delete_buffer (YY_BUFFER_STATE buf);
// Restore a buffer (for unwind-prot).
extern void restore_input_buffer (void *buf);
// Delete a buffer (for unwind-prot).
extern void delete_input_buffer (void *buf);
// See if a function file has extra garbage after the end statement.
// This needs to be defined in lex.l so that it can use yyinput() but
// it must be called from parse.y.
extern void check_for_garbage_after_fcn_def (void);
// For communication between the lexer and parser.
class lexical_feedback
{
public:
lexical_feedback (void) { init (); }
~lexical_feedback (void) { }
void init (void);
// Nonzero means we think we are looking at the beginning of a
// function definition.
int beginning_of_function;
// Brace level count.
int braceflag;
// Another context hack, this time for the plot command's `using',
// `title', and `with' keywords.
int cant_be_identifier;
// Nonzero means that we should convert spaces to a comma inside a
// matrix definition.
int convert_spaces_to_comma;
// Nonzero means we're in the middle of defining a function.
int defining_func;
// Nonzero means we're parsing the return list for a function.
int looking_at_return_list;
// Nonzero means we're parsing the parameter list for a function.
int looking_at_parameter_list;
// GAG. Stupid kludge so that [[1,2][3,4]] will work.
int do_comma_insert;
// Nonzero means we think we are looking at a set command.
int doing_set;
// Nonzero means we're looking at the range part of a plot command.
int in_plot_range;
// Nonzero means we're looking at the using part of a plot command.
int in_plot_using;
// Nonzero means we're looking at the style part of a plot command.
int in_plot_style;
// Nonzero means we're looking at an indirect reference to a
// structure element.
int looking_at_indirect_ref;
// Nonzero means we're in the middle of defining a loop.
int looping;
// Nonzero means we need to do some extra lookahead to avoid being
// screwed by bogus function syntax.
int maybe_screwed;
// Nonzero means we need to do some extra lookahead to avoid being
// screwed by bogus function syntax.
int maybe_screwed_again;
// Nonzero means we've seen something that means we must be past the
// range part of a plot command.
int past_plot_range;
// Nonzero means we're working on a plot command.
int plotting;
// Return transpose or start a string?
int quote_is_transpose;
private:
lexical_feedback (const lexical_feedback&);
lexical_feedback& operator = (const lexical_feedback&);
};
// Flags that need to be shared between the lexer and parser.
extern lexical_feedback lexer_flags;
extern void symbols_of_lex (void);
#endif
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/