m4browser.c

这是一个Linux下的集成开发环境

static int  current_function_paren_count;

static int result;

/*
 * Flush any function definitions that might be outstanding (ie. if its
 * label appears _last_ in a file.  When we reach EOF, check to see if its
 * defn needs to be flushed to the database.  Normally the occurence of
 * another label causes the defn to be stored.
 * 
 * Return 1 so flex will keep playing.
 */

int
yywrap()
{
  return(1);
}

void dump_function_definition();

void matched_pattern(char * pattern, char * text);

static void emit_var_access(char * varname, int acc);
static void emit_func_call(char * funcname);

#define FUNCTION 1


/* Macros after this point can all be overridden by user definitions in
 * section 1.
 */

#ifndef YY_SKIP_YYWRAP
#ifdef __cplusplus
extern "C" int yywrap YY_PROTO(( void ));
#else
extern int yywrap YY_PROTO(( void ));
#endif
#endif

#ifndef YY_NO_UNPUT
static void yyunput YY_PROTO(( int c, char *buf_ptr ));
#endif

#ifndef yytext_ptr
static void yy_flex_strncpy YY_PROTO(( char *, yyconst char *, int ));
#endif

#ifdef YY_NEED_STRLEN
static int yy_flex_strlen YY_PROTO(( yyconst char * ));
#endif

#ifndef YY_NO_INPUT
#ifdef __cplusplus
static int yyinput YY_PROTO(( void ));
#else
static int input YY_PROTO(( void ));
#endif
#endif

#if YY_STACK_USED
static int yy_start_stack_ptr = 0;
static int yy_start_stack_depth = 0;
static int *yy_start_stack = 0;
#ifndef YY_NO_PUSH_STATE
static void yy_push_state YY_PROTO(( int new_state ));
#endif
#ifndef YY_NO_POP_STATE
static void yy_pop_state YY_PROTO(( void ));
#endif
#ifndef YY_NO_TOP_STATE
static int yy_top_state YY_PROTO(( void ));
#endif

#else
#define YY_NO_PUSH_STATE 1
#define YY_NO_POP_STATE 1
#define YY_NO_TOP_STATE 1
#endif

#ifdef YY_MALLOC_DECL
YY_MALLOC_DECL
#else
#if __STDC__
#ifndef __cplusplus
#include <stdlib.h>
#endif
#else
/* Just try to get by without declaring the routines.  This will fail
 * miserably on non-ANSI systems for which sizeof(size_t) != sizeof(int)
 * or sizeof(void*) != sizeof(int).
 */
#endif
#endif

/* Amount of stuff to slurp up with each read. */
#ifndef YY_READ_BUF_SIZE
#define YY_READ_BUF_SIZE 8192
#endif

/* Copy whatever the last rule matched to the standard output. */

#ifndef ECHO
/* This used to be an fputs(), but since the string might contain NUL's,
 * we now use fwrite().
 */
#define ECHO (void) fwrite( yytext, yyleng, 1, yyout )
#endif

/* Gets input and stuffs it into "buf".  number of characters read, or YY_NULL,
 * is returned in "result".
 */
#ifndef YY_INPUT
#define YY_INPUT(buf,result,max_size) \
	if ( yy_current_buffer->yy_is_interactive ) \
		{ \
		int c = '*', n; \
		for ( n = 0; n < max_size && \
			     (c = getc( yyin )) != EOF && c != '\n'; ++n ) \
			buf[n] = (char) c; \
		if ( c == '\n' ) \
			buf[n++] = (char) c; \
		if ( c == EOF && ferror( yyin ) ) \
			YY_FATAL_ERROR( "input in flex scanner failed" ); \
		result = n; \
		} \
	else if ( ((result = fread( buf, 1, max_size, yyin )) == 0) \
		  && ferror( yyin ) ) \
		YY_FATAL_ERROR( "input in flex scanner failed" );
#endif

/* No semi-colon after return; correct usage is to write "yyterminate();" -
 * we don't want an extra ';' after the "return" because that will cause
 * some compilers to complain about unreachable statements.
 */
#ifndef yyterminate
#define yyterminate() return YY_NULL
#endif

/* Number of entries by which start-condition stack grows. */
#ifndef YY_START_STACK_INCR
#define YY_START_STACK_INCR 25
#endif

/* Report a fatal error. */
#ifndef YY_FATAL_ERROR
#define YY_FATAL_ERROR(msg) yy_fatal_error( msg )
#endif

/* Default declaration of generated scanner - a define so the user can
 * easily add parameters.
 */
#ifndef YY_DECL
#define YY_DECL int yylex YY_PROTO(( void ))
#endif

/* Code executed at the beginning of each rule, after yytext and yyleng
 * have been set up.
 */
#ifndef YY_USER_ACTION
#define YY_USER_ACTION
#endif

/* Code executed at the end of each rule. */
#ifndef YY_BREAK
#define YY_BREAK break;
#endif

#define YY_RULE_SETUP \
	if ( yyleng > 0 ) \
		yy_current_buffer->yy_at_bol = \
				(yytext[yyleng - 1] == '\n'); \
	YY_USER_ACTION

YY_DECL
	{
	register yy_state_type yy_current_state;
	register char *yy_cp = NULL, *yy_bp = NULL;
	register int yy_act;

#line 111 "m4browser.l"



	if ( yy_init )
		{
		yy_init = 0;

#ifdef YY_USER_INIT
		YY_USER_INIT;
#endif

		if ( ! yy_start )
			yy_start = 1;	/* first start state */

		if ( ! yyin )
			yyin = stdin;

		if ( ! yyout )
			yyout = stdout;

		if ( ! yy_current_buffer )
			yy_current_buffer =
				yy_create_buffer( yyin, YY_BUF_SIZE );

		yy_load_buffer_state();
		}

	while ( 1 )		/* loops until end-of-file is reached */
		{
		yy_cp = yy_c_buf_p;

		/* Support of yytext. */
		*yy_cp = yy_hold_char;

		/* yy_bp points to the position in yy_ch_buf of the start of
		 * the current run.
		 */
		yy_bp = yy_cp;

		yy_current_state = yy_start;
		yy_current_state += YY_AT_BOL();
yy_match:
		do
			{
			register YY_CHAR yy_c = yy_ec[YY_SC_TO_UI(*yy_cp)];
			if ( yy_accept[yy_current_state] )
				{
				yy_last_accepting_state = yy_current_state;
				yy_last_accepting_cpos = yy_cp;
				}
			while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
				{
				yy_current_state = (int) yy_def[yy_current_state];
				if ( yy_current_state >= 134 )
					yy_c = yy_meta[(unsigned int) yy_c];
				}
			yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
			++yy_cp;
			}
		while ( yy_base[yy_current_state] != 299 );

yy_find_action:
		yy_act = yy_accept[yy_current_state];
		if ( yy_act == 0 )
			{ /* have to back up */
			yy_cp = yy_last_accepting_cpos;
			yy_current_state = yy_last_accepting_state;
			yy_act = yy_accept[yy_current_state];
			}

		YY_DO_BEFORE_ACTION;


do_action:	/* This label is used only to access EOF actions. */


		switch ( yy_act )
	{ /* beginning of action switch */
			case 0: /* must back up */
			/* undo the effects of YY_DO_BEFORE_ACTION */
			*yy_cp = yy_hold_char;
			yy_cp = yy_last_accepting_cpos;
			yy_current_state = yy_last_accepting_state;
			goto yy_find_action;

case 1:
YY_RULE_SETUP
#line 113 "m4browser.l"
{
  matched_pattern("(", yytext);
  sn_advance_column(yyleng);
  current_function_paren_count++;
}
	YY_BREAK
case 2:
YY_RULE_SETUP
#line 119 "m4browser.l"
{
  matched_pattern(")", yytext);
  sn_advance_column(yyleng);
  assert(current_function_paren_count > 0);
  current_function_paren_count--;
  if (current_function_paren_count == 0) {
    current_function_line_end = sn_line();
    current_function_column_end = sn_column();

    dump_function_definition();

    BEGIN(INITIAL);
  }
}
	YY_BREAK
case 3:
YY_RULE_SETUP
#line 134 "m4browser.l"
{
  matched_pattern(".", yytext);
  sn_advance_column(yyleng); /* eat text */
}
	YY_BREAK
case 4:
YY_RULE_SETUP
#line 139 "m4browser.l"
{
  matched_pattern("\\$", yytext);
  sn_advance_column(yyleng); /* ignore \$ */
}
	YY_BREAK
case 5:
YY_RULE_SETUP
#line 144 "m4browser.l"
{
  matched_pattern("\\n", yytext);
  sn_advance_line();
  sn_reset_column();
}
	YY_BREAK
case 6:
YY_RULE_SETUP
#line 150 "m4browser.l"
{
  char * x = (char *) yytext;
  char * y = x + yyleng - 1;

  matched_pattern("{ws}*(#|dnl{ws}).*\\n", yytext);

  while (*x == '\t' || *x == ' ') { x++; }

  /* Insert comment highlight */

  sn_highlight(SN_HIGH_COMMENT,
      sn_line(),
      sn_column() + (x - yytext),
      sn_line(),
      sn_column() + yyleng - 1);

  if (*x == '#') {
    x++;
  } else if (*x == 'd') {
    x += 3;
  }
  while (*x == '\t' || *x == ' ') { x++; }
  sn_advance_column(x - yytext);

  assert(*y == '\n');
  *y = '\0';

  sn_insert_comment(
    /* classname */ NULL,
    /* funcname */ NULL,
    sn_current_file(),
    x,
    sn_line(),
    sn_column());

  sn_advance_line();
  sn_reset_column();
}
	YY_BREAK
case 7:
YY_RULE_SETUP
#line 189 "m4browser.l"
{
  char * x = (char *) yytext;

  matched_pattern("${symbol}", yytext);

  /* Add global var highlight */
  
  sn_highlight(SN_HIGH_VAR_GLOBAL,
      sn_line(), sn_column(),
      sn_line(), sn_column() + yyleng);

  /* Trim leading $ off the front of the symbol
   * and ignore '{' and '}' characters if there */

  assert(*x == '$');
  x++;
  if (*x == '{') {
    x++;
    *(yytext + yyleng - 1) = '\0';
  }

  emit_var_access(x, SN_REF_READ);
  sn_advance_column(yyleng);
}
	YY_BREAK
case 8:
YY_RULE_SETUP
#line 214 "m4browser.l"
{
  char * x = (char *) yytext;

  matched_pattern("$\\{#{symbol}\\}", yytext);

  /* Trim leading ${# of the front */

  assert(*x == '$');
  x++;
  assert(*x == '{');
  x++;
  assert(*x == '#');
  x++;
  *(yytext + yyleng - 1) = '\0';

  sn_highlight(SN_HIGH_VAR_GLOBAL,
      sn_line(), sn_column() + (x - yytext),
      sn_line(), sn_column() + (yyleng - 1));

  emit_var_access(x, SN_REF_READ);
  sn_advance_column(yyleng);
}
	YY_BREAK
case 9:
YY_RULE_SETUP
#line 237 "m4browser.l"
{
  char * x = (char *) yytext;
  char * y;
  int is_read_write = 0;

  matched_pattern("$\\{{symbol}(-|+|?|=|#|%){symbol}\\}", yytext);

  /* Trim leading $ off the front of the symbol
   * and ignore '{' and '}' characters if there */

  assert(*x == '$');
  x++;
  assert(*x == '{');
  x++;
  *(yytext + yyleng - 1) = '\0';

  /* Find separator symbol */
  
  for (y=x ; *y ; y++) {
      if (*y == '-' || 
          *y == '+' ||
          *y == '?' ||
          *y == '#' ||
          *y == '%' ||
          *y == '/') {
          break;
      }
      if ((*y == '=') ||
              ((*y == ':') &&
               (*(y+1) == '='))) {
          is_read_write = 1;
          break;
      }
      if (*y == ':') {
          break;
      }
  }
  *y = 0;

  sn_highlight(SN_HIGH_VAR_GLOBAL,
      sn_line(), sn_column() + (x - yytext),
      sn_line(), sn_column() + (y - yytext));

  emit_var_access(x, SN_REF_READ);
  if (is_read_write) {
    emit_var_access(x, SN_REF_WRITE);
  }
  sn_advance_column(yyleng);
}
	YY_BREAK
case 10:
YY_RULE_SETUP
#line 287 "m4browser.l"
{
  char * x = (char *) yytext;
  char * y;
  
  matched_pattern("{symbol}=", yytext);

  /* Add global var highlight */

  sn_highlight(SN_HIGH_VAR_GLOBAL,
      sn_line(), sn_column(),
      sn_line(), sn_column() + yyleng - 1);

  /* Trim the '=' off the end of the string */
  
  for (y=x; *y ; y++) {
      if (*y == '=') {
          *y = 0;
	  break;
      }
  }

  emit_var_access(x, SN_REF_WRITE);
  sn_advance_column(yyleng);
}
	YY_BREAK
case 11:
YY_RULE_SETUP
#line 312 "m4browser.l"
{
  char * x = (char *) yytext;
  char * y;

  matched_pattern("^{ws}*{func-decl}\({ws}*{quoted-symbol}{ws}*,", yytext);

  current_function_line_start = sn_line();
  current_function_column_start = sn_column();

  /* Skip {ws} */

  for ( ; *x ; x++) {
      if (*x != ' ' &&
          *x != '\t') {
          break;
      }
  }

  /* Find '(' character after AC_DEFUN */
  
  for (y=x ; *y ; y++) {
      if (*y == '(') {
          break;
      }
  }

  /* Highlight AC_DEFUN as a keyword, not a macro invocation */

  sn_highlight(SN_HIGH_KEYWORD,
      sn_line(), sn_column() + (x - yytext),
      sn_line(), sn_column() + (y - yytext));

  x = y;
  x++;

  /* Skip {ws} and optional [ */

  for ( ; *x ; x++) {
      if (*x != ' ' &&
          *x != '\t' &&
          *x != '[') {
          break;
      }
  }

  /* x now points to the start of the macro name, find the end */

  sn_advance_column(x - yytext);

  for (y=x ; *y ; y++) {
      if (*y == ' ' ||
          *y == '\t' ||
          *y == ']' ||
          *y == ',') {