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/* FLEX lexer for Ada expressions, for GDB.

   Copyright (C) 1994, 1997, 1998, 2000, 2001, 2002, 2003, 2007, 2008

   Free Software Foundation, Inc.

This file is part of GDB.

This program 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 of the License, or

(at your option) any later version.

This program 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 this program; if not, write to the Free Software

Foundation, Inc., 51 Franklin Street, Fifth Floor,

Boston, MA 02110-1301, USA.  */

/*----------------------------------------------------------------------*/

/* The converted version of this file is to be included in ada-exp.y, */

/* the Ada parser for gdb.  The function yylex obtains characters from */

/* the global pointer lexptr.  It returns a syntactic category for */

/* each successive token and places a semantic value into yylval */

/* (ada-lval), defined by the parser.   */

DIG     [0-9]

NUM10   ({DIG}({DIG}|_)*)

HEXDIG  [0-9a-f]

NUM16   ({HEXDIG}({HEXDIG}|_)*)

OCTDIG  [0-7]

LETTER  [a-z_]

ID      ({LETTER}({LETTER}|{DIG})*|"<"{LETTER}({LETTER}|{DIG})*">")

WHITE   [ \t\n]

TICK    ("'"{WHITE}*)

GRAPHIC [a-z0-9 #&'()*+,-./:;<>=_|!$%?@\[\]\\^`{}~]

OPER    ([-+*/=<>&]|"<="|">="|"**"|"/="|"and"|"or"|"xor"|"not"|"mod"|"rem"|"abs")

EXP     (e[+-]{NUM10})

POSEXP  (e"+"?{NUM10})

%{

#define NUMERAL_WIDTH 256

#define LONGEST_SIGN ((ULONGEST) 1 << (sizeof(LONGEST) * HOST_CHAR_BIT - 1))

/* Temporary staging for numeric literals.  */

static char numbuf[NUMERAL_WIDTH];

 static void canonicalizeNumeral (char *s1, const char *);

static struct stoken processString (const char*, int);

static int processInt (const char *, const char *, const char *);

static int processReal (const char *);

static struct stoken processId (const char *, int);

static int processAttribute (const char *);

static int find_dot_all (const char *);

#undef YY_DECL

#define YY_DECL static int yylex ( void )

#undef YY_INPUT

#define YY_INPUT(BUF, RESULT, MAX_SIZE) \

    if ( *lexptr == '\000' ) \

      (RESULT) = YY_NULL; \

    else \

      { \

        *(BUF) = *lexptr; \

        (RESULT) = 1; \

        lexptr += 1; \

      }

static int find_dot_all (const char *);

%}

%option case-insensitive interactive nodefault

%s BEFORE_QUAL_QUOTE

%%

{WHITE}          { }

"--".*           { yyterminate(); }

{NUM10}{POSEXP}  {

                   canonicalizeNumeral (numbuf, yytext);

                   return processInt (NULL, numbuf, strrchr(numbuf, 'e')+1);

                 }

{NUM10}          {

                   canonicalizeNumeral (numbuf, yytext);

                   return processInt (NULL, numbuf, NULL);

                 }

{NUM10}"#"{HEXDIG}({HEXDIG}|_)*"#"{POSEXP} {

                   canonicalizeNumeral (numbuf, yytext);

                   return processInt (numbuf,

                                      strchr (numbuf, '#') + 1,

                                      strrchr(numbuf, '#') + 1);

                 }

{NUM10}"#"{HEXDIG}({HEXDIG}|_)*"#" {

                   canonicalizeNumeral (numbuf, yytext);

                   return processInt (numbuf, strchr (numbuf, '#') + 1, NULL);

                 }

"0x"{HEXDIG}+   {

                  canonicalizeNumeral (numbuf, yytext+2);

                  return processInt ("16#", numbuf, NULL);

                }

{NUM10}"."{NUM10}{EXP} {

                   canonicalizeNumeral (numbuf, yytext);

                   return processReal (numbuf);

                }

{NUM10}"."{NUM10} {

                   canonicalizeNumeral (numbuf, yytext);

                   return processReal (numbuf);

                }

{NUM10}"#"{NUM16}"."{NUM16}"#"{EXP} {

                   error (_("Based real literals not implemented yet."));

                }

{NUM10}"#"{NUM16}"."{NUM16}"#" {

                   error (_("Based real literals not implemented yet."));

                }

"'"({GRAPHIC}|\")"'" {

                   yylval.typed_val.type = type_char ();

                   yylval.typed_val.val = yytext[1];

                   return CHARLIT;

                }

"'[\""{HEXDIG}{2}"\"]'"   {

                   int v;

                   yylval.typed_val.type = type_char ();

                   sscanf (yytext+3, "%2x", &v);

                   yylval.typed_val.val = v;

                   return CHARLIT;

                }

\"({GRAPHIC}|"[\""({HEXDIG}{2}|\")"\"]")*\"   {

                   yylval.sval = processString (yytext+1, yyleng-2);

                   return STRING;

                }

\"              {

                   error (_("ill-formed or non-terminated string literal"));

                }

if              {

                  while (*lexptr != 'i' && *lexptr != 'I')

                    lexptr -= 1;

                  yyrestart(NULL);

                  return 0;

                }

        /* ADA KEYWORDS */

abs             { return ABS; }

and             { return _AND_; }

else            { return ELSE; }

in              { return IN; }

mod             { return MOD; }

new             { return NEW; }

not             { return NOT; }

null            { return NULL_PTR; }

or              { return OR; }

others          { return OTHERS; }

rem             { return REM; }

then            { return THEN; }

xor             { return XOR; }

        /* ATTRIBUTES */

{TICK}[a-zA-Z][a-zA-Z]+ { return processAttribute (yytext+1); }

        /* PUNCTUATION */

"=>"            { return ARROW; }

".."            { return DOTDOT; }

"**"            { return STARSTAR; }

":="            { return ASSIGN; }

"/="            { return NOTEQUAL; }

"<="            { return LEQ; }

">="            { return GEQ; }

"'" { BEGIN INITIAL; return '\''; }

[-&*+./:<>=|;\[\]] { return yytext[0]; }

","             { if (paren_depth == 0 && comma_terminates)

                    {

                      lexptr -= 1;

                      yyrestart(NULL);

                      return 0;

                    }

                  else

                    return ',';

                }

"("             { paren_depth += 1; return '('; }

")"             { if (paren_depth == 0)

                    {

                      lexptr -= 1;

                      yyrestart(NULL);

                      return 0;

                    }

                  else

                    {

                      paren_depth -= 1;

                      return ')';

                    }

                }

"."{WHITE}*all  { return DOT_ALL; }

"."{WHITE}*{ID} {

                  yylval.sval = processId (yytext+1, yyleng-1);

                  return DOT_ID;

                }

{ID}({WHITE}*"."{WHITE}*({ID}|\"{OPER}\"))*(" "*"'")?  {

                  int all_posn = find_dot_all (yytext);

                  if (all_posn == -1 && yytext[yyleng-1] == '\'')

                    {

                      BEGIN BEFORE_QUAL_QUOTE;

                      yyless (yyleng-1);

                    }

                  else if (all_posn >= 0)

                    yyless (all_posn);

                  yylval.sval = processId (yytext, yyleng);

                  return NAME;

               }

        /* GDB EXPRESSION CONSTRUCTS  */

"'"[^']+"'"{WHITE}*:: {

                  yyless (yyleng - 2);

                  yylval.sval = processId (yytext, yyleng);

                  return NAME;

                }

"::"            { return COLONCOLON; }

[{}@]           { return yytext[0]; }

        /* REGISTERS AND GDB CONVENIENCE VARIABLES */

"$"({LETTER}|{DIG}|"$")*  {

                  yylval.sval.ptr = yytext;

                  yylval.sval.length = yyleng;

                  return SPECIAL_VARIABLE;

                }

        /* CATCH-ALL ERROR CASE */

.               { error (_("Invalid character '%s' in expression."), yytext); }

%%

#include 

#include "gdb_string.h"

/* Initialize the lexer for processing new expression. */

void

lexer_init (FILE *inp)

{

  BEGIN INITIAL;

  yyrestart (inp);

}

/* Copy S2 to S1, removing all underscores, and downcasing all letters.  */

static void

canonicalizeNumeral (char *s1, const char *s2)

{

  for (; *s2 != '\000'; s2 += 1)

    {

      if (*s2 != '_')

        {

          *s1 = tolower(*s2);

          s1 += 1;

        }

    }

  s1[0] = '\000';

}

/* Interprets the prefix of NUM that consists of digits of the given BASE

   as an integer of that BASE, with the string EXP as an exponent.

   Puts value in yylval, and returns INT, if the string is valid.  Causes

   an error if the number is improperly formated.   BASE, if NULL, defaults

   to "10", and EXP to "1".  The EXP does not contain a leading 'e' or 'E'.

 */

static int

processInt (const char *base0, const char *num0, const char *exp0)

{

  ULONGEST result;

  long exp;

  int base;

  char *trailer;

  if (base0 == NULL)

    base = 10;

  else

    {

      base = strtol (base0, (char **) NULL, 10);

      if (base < 2 || base > 16)

        error (_("Invalid base: %d."), base);

    }

  if (exp0 == NULL)

    exp = 0;

  else

    exp = strtol(exp0, (char **) NULL, 10);

  errno = 0;

  result = strtoulst (num0, (const char **) &trailer, base);

  if (errno == ERANGE)

    error (_("Integer literal out of range"));

  if (isxdigit(*trailer))

    error (_("Invalid digit `%c' in based literal"), *trailer);

  while (exp > 0)

    {

      if (result > (ULONG_MAX / base))

        error (_("Integer literal out of range"));

      result *= base;

      exp -= 1;

    }

  if ((result >> (gdbarch_int_bit (current_gdbarch)-1)) == 0)

    yylval.typed_val.type = type_int ();

  else if ((result >> (gdbarch_long_bit (current_gdbarch)-1)) == 0)

    yylval.typed_val.type = type_long ();

  else if (((result >> (gdbarch_long_bit (current_gdbarch)-1)) >> 1) == 0)

    {

      /* We have a number representable as an unsigned integer quantity.

         For consistency with the C treatment, we will treat it as an

         anonymous modular (unsigned) quantity.  Alas, the types are such

         that we need to store .val as a signed quantity.  Sorry

         for the mess, but C doesn't officially guarantee that a simple

         assignment does the trick (no, it doesn't; read the reference manual).

       */

      yylval.typed_val.type = builtin_type_unsigned_long;

      if (result & LONGEST_SIGN)

        yylval.typed_val.val =

          (LONGEST) (result & ~LONGEST_SIGN)

          - (LONGEST_SIGN>>1) - (LONGEST_SIGN>>1);

      else

        yylval.typed_val.val = (LONGEST) result;

      return INT;

    }

  else

    yylval.typed_val.type = type_long_long ();

  yylval.typed_val.val = (LONGEST) result;

  return INT;

}

static int

processReal (const char *num0)

{

  sscanf (num0, "%" DOUBLEST_SCAN_FORMAT, &yylval.typed_val_float.dval);

  yylval.typed_val_float.type = type_float ();

  if (sizeof(DOUBLEST) >= gdbarch_double_bit (current_gdbarch)

                            / TARGET_CHAR_BIT)

    yylval.typed_val_float.type = type_double ();

  if (sizeof(DOUBLEST) >= gdbarch_long_double_bit (current_gdbarch)

                            / TARGET_CHAR_BIT)

    yylval.typed_val_float.type = type_long_double ();

  return FLOAT;

}

/* Store a canonicalized version of NAME0[0..LEN-1] in yylval.ssym.  The

   resulting string is valid until the next call to ada_parse.  It differs

   from NAME0 in that:

    + Characters between '...' or <...> are transfered verbatim to

      yylval.ssym.

    + <, >, and trailing "'" characters in quoted sequences are removed

      (a leading quote is preserved to indicate that the name is not to be

      GNAT-encoded).

    + Unquoted whitespace is removed.

    + Unquoted alphabetic characters are mapped to lower case.

   Result is returned as a struct stoken, but for convenience, the string

   is also null-terminated.  Result string valid until the next call of

   ada_parse.

 */

static struct stoken

processId (const char *name0, int len)

{

  char *name = obstack_alloc (&temp_parse_space, len + 11);

  int i0, i;

  struct stoken result;

  while (len > 0 && isspace (name0[len-1]))

    len -= 1;

  i = i0 = 0;

  while (i0 < len)

    {

      if (isalnum (name0[i0]))

        {

          name[i] = tolower (name0[i0]);

          i += 1; i0 += 1;

        }

      else switch (name0[i0])

        {

        default:

          name[i] = name0[i0];

          i += 1; i0 += 1;

          break;

        case ' ': case '\t':

          i0 += 1;

          break;

        case '\'':

          do

            {

              name[i] = name0[i0];

              i += 1; i0 += 1;

            }

          while (i0 < len && name0[i0] != '\'');

          i0 += 1;

          break;

        case '<':

          i0 += 1;

          while (i0 < len && name0[i0] != '>')

            {

              name[i] = name0[i0];

              i += 1; i0 += 1;

            }

          i0 += 1;

          break;

        }

    }

  name[i] = '\000';

  result.ptr = name;

  result.length = i;

  return result;

}

/* Return TEXT[0..LEN-1], a string literal without surrounding quotes,

   with special hex character notations replaced with characters.

   Result valid until the next call to ada_parse.  */

static struct stoken

processString (const char *text, int len)

{

  const char *p;

  char *q;

  const char *lim = text + len;

  struct stoken result;

  q = result.ptr = obstack_alloc (&temp_parse_space, len);

  p = text;

  while (p < lim)

    {

      if (p[0] == '[' && p[1] == '"' && p+2 < lim)

         {

           if (p[2] == '"')  /* "...["""]... */

             {

               *q = '"';

               p += 4;

             }

           else

             {

               int chr;

               sscanf (p+2, "%2x", &chr);

               *q = (char) chr;

               p += 5;

             }

         }

       else

         *q = *p;

       q += 1;

       p += 1;

     }

  result.length = q - result.ptr;

  return result;

}

/* Returns the position within STR of the '.' in a

   '.{WHITE}*all' component of a dotted name, or -1 if there is none.

   Note: we actually don't need this routine, since 'all' can never be an

   Ada identifier.  Thus, looking up foo.all or foo.all.x as a name

   must fail, and will eventually be interpreted as (foo).all or

   (foo).all.x.  However, this does avoid an extraneous lookup. */

static int

find_dot_all (const char *str)

{

  int i;

  for (i = 0; str[i] != '\000'; i += 1)

    {

      if (str[i] == '.')

        {

          int i0 = i;

          do

            i += 1;

          while (isspace (str[i]));

          if (strncmp (str+i, "all", 3) == 0

              && ! isalnum (str[i+3]) && str[i+3] != '_')

            return i0;

        }

    }

  return -1;

}

/* Returns non-zero iff string SUBSEQ matches a subsequence of STR, ignoring

   case.  */

static int

subseqMatch (const char *subseq, const char *str)

{

  if (subseq[0] == '\0')

    return 1;

  else if (str[0] == '\0')

    return 0;

  else if (tolower (subseq[0]) == tolower (str[0]))

    return subseqMatch (subseq+1, str+1) || subseqMatch (subseq, str+1);

  else

    return subseqMatch (subseq, str+1);

}

static struct { const char *name; int code; }

attributes[] = {

  { "address", TICK_ADDRESS },

  { "unchecked_access", TICK_ACCESS },

  { "unrestricted_access", TICK_ACCESS },

  { "access", TICK_ACCESS },

  { "first", TICK_FIRST },

  { "last", TICK_LAST },

  { "length", TICK_LENGTH },

  { "max", TICK_MAX },

  { "min", TICK_MIN },

  { "modulus", TICK_MODULUS },

  { "pos", TICK_POS },

  { "range", TICK_RANGE },

  { "size", TICK_SIZE },

  { "tag", TICK_TAG },

  { "val", TICK_VAL },

  { NULL, -1 }

};

/* Return the syntactic code corresponding to the attribute name or

   abbreviation STR.  */

static int

processAttribute (const char *str)

{

  int i, k;

  for (i = 0; attributes[i].code != -1; i += 1)

    if (strcasecmp (str, attributes[i].name) == 0)

      return attributes[i].code;

  for (i = 0, k = -1; attributes[i].code != -1; i += 1)

    if (subseqMatch (str, attributes[i].name))

      {

        if (k == -1)

          k = i;

        else

          error (_("ambiguous attribute name: `%s'"), str);

      }

  if (k == -1)

    error (_("unrecognized attribute: `%s'"), str);

  return attributes[k].code;

}

int

yywrap(void)

{

  return 1;

}

/* Dummy definition to suppress warnings about unused static definitions. */

typedef void (*dummy_function) ();

dummy_function ada_flex_use[] =

{

  (dummy_function) yyunput

};