/* xgettext Java backend.
   Copyright (C) 2003 Free Software Foundation, Inc.
   Written by Bruno Haible <bruno@clisp.org>, 2003.

   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, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "message.h"
#include "xgettext.h"
#include "x-java.h"
#include "error.h"
#include "xalloc.h"
#include "exit.h"
#include "hash.h"
#include "po-charset.h"
#include "utf16-ucs4.h"
#include "ucs4-utf8.h"
#include "gettext.h"

#define _(s) gettext(s)

#define SIZEOF(a) (sizeof(a) / sizeof(a[0]))


/* The Java syntax is defined in the
     Java Language Specification, Second Edition,
     (available from http://java.sun.com/),
     chapter 3 "Lexical Structure".  */


/* ====================== Keyword set customization.  ====================== */

/* If true extract all strings.  */
static bool extract_all = false;

static hash_table keywords;
static bool default_keywords = true;


void
x_java_extract_all ()
{
  extract_all = true;
}


void
x_java_keyword (const char *name)
{
  if (name == NULL)
    default_keywords = false;
  else
    {
      const char *end;
      int argnum1;
      int argnum2;
      const char *colon;

      if (keywords.table == NULL)
	init_hash (&keywords, 100);

      split_keywordspec (name, &end, &argnum1, &argnum2);

      /* The characters between name and end should form a valid Java
	 identifier sequence with dots.
	 A colon means an invalid parse in split_keywordspec().  */
      colon = strchr (name, ':');
      if (colon == NULL || colon >= end)
	{
	  if (argnum1 == 0)
	    argnum1 = 1;
	  insert_entry (&keywords, name, end - name,
			(void *) (long) (argnum1 + (argnum2 << 10)));
	}
    }
}

/* Finish initializing the keywords hash table.
   Called after argument processing, before each file is processed.  */
static void
init_keywords ()
{
  if (default_keywords)
    {
      x_java_keyword ("GettextResource.gettext:2");	/* static method */
      x_java_keyword ("GettextResource.ngettext:2,3");	/* static method */
      x_java_keyword ("gettext");
      x_java_keyword ("ngettext:1,2");
      x_java_keyword ("getString");	/* ResourceBundle.getString */
      default_keywords = false;
    }
}

void
init_flag_table_java ()
{
  xgettext_record_flag ("GettextResource.gettext:2:pass-java-format");
  xgettext_record_flag ("GettextResource.ngettext:2:pass-java-format");
  xgettext_record_flag ("GettextResource.ngettext:3:pass-java-format");
  xgettext_record_flag ("gettext:1:pass-java-format");
  xgettext_record_flag ("ngettext:1:pass-java-format");
  xgettext_record_flag ("ngettext:2:pass-java-format");
  xgettext_record_flag ("getString:1:pass-java-format");
  xgettext_record_flag ("MessageFormat:1:java-format");
  xgettext_record_flag ("MessageFormat.format:1:java-format");
}


/* ======================== Reading of characters.  ======================== */

/* Real filename, used in error messages about the input file.  */
static const char *real_file_name;

/* Logical filename and line number, used to label the extracted messages.  */
static char *logical_file_name;
static int line_number;

/* The input file stream.  */
static FILE *fp;


/* Fetch the next single-byte character from the input file.
   Pushback can consist of an unlimited number of 'u' followed by up to 4
   other characters.  */

/* Special coding of multiple 'u's in the pushback buffer.  */
#define MULTIPLE_U(count) (0x1000 + (count))

static int phase1_pushback[5];
static unsigned int phase1_pushback_length;

static int
phase1_getc ()
{
  int c;

  if (phase1_pushback_length)
    {
      c = phase1_pushback[--phase1_pushback_length];
      if (c >= MULTIPLE_U (0))
	{
	  if (c > MULTIPLE_U (1))
	    phase1_pushback[phase1_pushback_length++] = c - 1;
	  return 'u';
	}
      else
	return c;
    }

  c = getc (fp);

  if (c == EOF)
    {
      if (ferror (fp))
	error (EXIT_FAILURE, errno, _("\
error while reading \"%s\""), real_file_name);
    }

  return c;
}

/* Supports any number of 'u' and up to 4 arbitrary characters of pushback.  */
static void
phase1_ungetc (int c)
{
  if (c != EOF)
    {
      if (c == 'u')
	{
	  if (phase1_pushback_length > 0
	      && phase1_pushback[phase1_pushback_length - 1] >= MULTIPLE_U (0))
	    phase1_pushback[phase1_pushback_length - 1]++;
	  else
	    {
	      if (phase1_pushback_length == SIZEOF (phase1_pushback))
		abort ();
	      phase1_pushback[phase1_pushback_length++] = MULTIPLE_U (1);
	    }
	}
      else
	{
	  if (phase1_pushback_length == SIZEOF (phase1_pushback))
	    abort ();
	  phase1_pushback[phase1_pushback_length++] = c;
	}
    }
}


/* Fetch the next single-byte character or Unicode character from the file.
   (Here, as in the Java Language Specification, when we say "Unicode
   character", we actually mean "UTF-16 encoding unit".)  */

/* Return value of phase 2, 3, 4 when EOF is reached.  */
#define P2_EOF 0xffff

/* Convert an UTF-16 code point to a return value that can be distinguished
   from a single-byte return value.  */
#define UNICODE(code) (0x10000 + (code))

/* Test a return value of phase 2, 3, 4 whether it designates an UTF-16 code
   point.  */
#define IS_UNICODE(p2_result) ((p2_result) >= 0x10000)

/* Extract the UTF-16 code of a return value that satisfies IS_UNICODE.  */
#define UTF16_VALUE(p2_result) ((p2_result) - 0x10000)

/* Reduces a return value of phase 2, 3, 4 by unmasking the UNICODE bit,
   so that it can be more easily compared against an ASCII character.
   (RED (c) == 'x')  is equivalent to  (c == 'x' || c == UNICODE ('x')).  */
#define RED(p2_result) ((p2_result) & 0xffff)

static int phase2_pushback[1];
static int phase2_pushback_length;

static int
phase2_getc ()
{
  int c;

  if (phase2_pushback_length)
    return phase2_pushback[--phase2_pushback_length];

  c = phase1_getc ();
  if (c == EOF)
    return P2_EOF;
  if (c == '\\')
    {
      c = phase1_getc ();
      if (c == 'u')
	{
	  unsigned int u_count = 1;
	  unsigned char buf[4];
	  unsigned int n;
	  int i;

	  for (;;)
	    {
	      c = phase1_getc ();
	      if (c != 'u')
		break;
	      u_count++;
	    }
	  phase1_ungetc (c);

	  n = 0;
	  for (i = 0; i < 4; i++)
	    {
	      c = phase1_getc ();

	      if (c >= '0' && c <= '9')
		n = (n << 4) + (c - '0');
	      else if (c >= 'A' && c <= 'F')
		n = (n << 4) + (c - 'A' + 10);
	      else if (c >= 'a' && c <= 'f')
		n = (n << 4) + (c - 'a' + 10);
	      else
		{
		  phase1_ungetc (c);
		  while (--i >= 0)
		    phase1_ungetc (buf[i]);
		  for (; u_count > 0; u_count--)
		    phase1_ungetc ('u');
		  return '\\';
		}

	      buf[i] = c;
	    }
	  return UNICODE (n);
	}
      phase1_ungetc (c);
      return '\\';
    }
  return c;
}

/* Supports only one pushback character.  */
static void
phase2_ungetc (int c)
{
  if (c != P2_EOF)
    {
      if (phase2_pushback_length == SIZEOF (phase2_pushback))
	abort ();
      phase2_pushback[phase2_pushback_length++] = c;
    }
}


/* Fetch the next single-byte character or Unicode character from the file.
   With line number handling.
   Convert line terminators to '\n' or UNICODE ('\n').  */

static int phase3_pushback[2];
static int phase3_pushback_length;

static int
phase3_getc ()
{
  int c;

  if (phase3_pushback_length)
    {
      c = phase3_pushback[--phase3_pushback_length];
      if (c == '\n')
	++line_number;
      return c;
    }

  c = phase2_getc ();

  /* Handle line terminators.  */
  if (RED (c) == '\r')
    {
      int c1 = phase2_getc ();

      if (RED (c1) != '\n')
	phase2_ungetc (c1);

      /* Seen line terminator CR or CR/LF.  */
      if (c == '\r' || c1 == '\n')
	{
	  ++line_number;
	  return '\n';
	}
      else
	return UNICODE ('\n');
    }
  else if (RED (c) == '\n')
    {
      /* Seen line terminator LF.  */
      if (c == '\n')
	{
	  ++line_number;
	  return '\n';
	}
      else
	return UNICODE ('\n');
    }

  return c;
}

/* Supports 2 characters of pushback.  */
static void
phase3_ungetc (int c)
{
  if (c != P2_EOF)
    {
      if (c == '\n')
	--line_number;
      if (phase3_pushback_length == SIZEOF (phase3_pushback))
	abort ();
      phase3_pushback[phase3_pushback_length++] = c;
    }
}


/* ========================= Accumulating strings.  ======================== */

/* A string buffer type that allows appending bytes (in the
   xgettext_current_source_encoding) or Unicode characters.
   Returns the entire string in UTF-8 encoding.  */

struct string_buffer
{
  /* The part of the string that has already been converted to UTF-8.  */
  char *utf8_buffer;
  size_t utf8_buflen;
  size_t utf8_allocated;
  /* The first half of an UTF-16 surrogate character.  */
  unsigned short utf16_surr;
  /* The part of the string that is still in the source encoding.  */
  char *curr_buffer;
  size_t curr_buflen;
  size_t curr_allocated;
};

/* Initialize a 'struct string_buffer' to empty.  */
static inline void
init_string_buffer (struct string_buffer *bp)
{
  bp->utf8_buffer = NULL;
  bp->utf8_buflen = 0;
  bp->utf8_allocated = 0;
  bp->utf16_surr = 0;
  bp->curr_buffer = NULL;
  bp->curr_buflen = 0;
  bp->curr_allocated = 0;
}

/* Auxiliary function: Append a byte to bp->curr.  */
static inline void
string_buffer_append_byte (struct string_buffer *bp, unsigned char c)
{
  if (bp->curr_buflen == bp->curr_allocated)
    {
      bp->curr_allocated = 2 * bp->curr_allocated + 10;
      bp->curr_buffer = xrealloc (bp->curr_buffer, bp->curr_allocated);
    }
  bp->curr_buffer[bp->curr_buflen++] = c;
}

/* Auxiliary function: Ensure count more bytes are available in bp->utf8.  */
static inline void
string_buffer_append_unicode_grow (struct string_buffer *bp, size_t count)
{
  if (bp->utf8_buflen + count > bp->utf8_allocated)
    {
      size_t new_allocated = 2 * bp->utf8_allocated + 10;
      if (new_allocated < bp->utf8_buflen + count)
	new_allocated = bp->utf8_buflen + count;
      bp->utf8_allocated = new_allocated;
      bp->utf8_buffer = xrealloc (bp->utf8_buffer, new_allocated);
    }
}

/* Auxiliary function: Append a Unicode character to bp->utf8.
   uc must be < 0x110000.  */
static inline void
string_buffer_append_unicode (struct string_buffer *bp, unsigned int uc)
{
  unsigned char utf8buf[6];
  int count = u8_uctomb (utf8buf, uc, 6);

  if (count < 0)
    /* The caller should have ensured that uc is not out-of-range.  */
    abort ();

  string_buffer_append_unicode_grow (bp, count);
  memcpy (bp->utf8_buffer + bp->utf8_buflen, utf8buf, count);
  bp->utf8_buflen += count;
}

/* Auxiliary function: Flush bp->utf16_surr into bp->utf8_buffer.  */
static inline void
string_buffer_flush_utf16_surr (struct string_buffer *bp)
{
  if (bp->utf16_surr != 0)
    {
      /* A half surrogate is invalid, therefore use U+FFFD instead.  */
      string_buffer_append_unicode (bp, 0xfffd);
      bp->utf16_surr = 0;
    }
}

/* Auxiliary function: Flush bp->curr_buffer into bp->utf8_buffer.  */
static inline void
string_buffer_flush_curr_buffer (struct string_buffer *bp, int lineno)
{
  if (bp->curr_buflen > 0)
    {
      char *curr;
      size_t count;

      string_buffer_append_byte (bp, '\0');

      /* Convert from the source encoding to UTF-8.  */
      curr = from_current_source_encoding (bp->curr_buffer,
					   logical_file_name, lineno);

      /* Append it to bp->utf8_buffer.  */
      count = strlen (curr);
      string_buffer_append_unicode_grow (bp, count);
      memcpy (bp->utf8_buffer + bp->utf8_buflen, curr, count);
      bp->utf8_buflen += count;

      if (curr != bp->curr_buffer)
	free (curr);
      bp->curr_buflen = 0;
    }
}

/* Append a character or Unicode character to a 'struct string_buffer'.  */
static void
string_buffer_append (struct string_buffer *bp, int c)
{
  if (IS_UNICODE (c))
    {
      /* Append a Unicode character.  */

      /* Switch from multibyte character mode to Unicode character mode.  */
      string_buffer_flush_curr_buffer (bp, line_number);

      /* Test whether this character and the previous one form a Unicode
	 surrogate character pair.  */
      if (bp->utf16_surr != 0
	  && (c >= UNICODE (0xdc00) && c < UNICODE (0xe000)))
	{
	  unsigned short utf16buf[2];
	  unsigned int uc;

	  utf16buf[0] = bp->utf16_surr;
	  utf16buf[1] = UTF16_VALUE (c);
	  if (u16_mbtouc_aux (&uc, utf16buf, 2) != 2)
	    abort ();

	  string_buffer_append_unicode (bp, uc);
	  bp->utf16_surr = 0;
	}
      else
	{
	  string_buffer_flush_utf16_surr (bp);

	  if (c >= UNICODE (0xd800) && c < UNICODE (0xdc00))
	    bp->utf16_surr = UTF16_VALUE (c);
	  else
	    string_buffer_append_unicode (bp, UTF16_VALUE (c));
	}
    }
  else
    {
      /* Append a single byte.  */

      /* Switch from Unicode character mode to multibyte character mode.  */
      string_buffer_flush_utf16_surr (bp);

      /* When a newline is seen, convert the accumulated multibyte sequence.
	 This ensures a correct line number in the error message in case of
	 a conversion error.  The "- 1" is to account for the newline.  */
      if (c == '\n')
	string_buffer_flush_curr_buffer (bp, line_number - 1);

      string_buffer_append_byte (bp, (unsigned char) c);
    }
}

/* Return the string buffer's contents.  */
static char *
string_buffer_result (struct string_buffer *bp)
{
  /* Flush all into bp->utf8_buffer.  */
  string_buffer_flush_utf16_surr (bp);
  string_buffer_flush_curr_buffer (bp, line_number);
  /* NUL-terminate it.  */
  string_buffer_append_unicode_grow (bp, 1);
  bp->utf8_buffer[bp->utf8_buflen] = '\0';
  /* Return it.  */
  return bp->utf8_buffer;
}

/* Free the memory pointed to by a 'struct string_buffer'.  */
static inline void
free_string_buffer (struct string_buffer *bp)
{
  free (bp->utf8_buffer);
  free (bp->curr_buffer);
}


/* ======================== Accumulating comments.  ======================== */


/* Accumulating a single comment line.  */

static struct string_buffer comment_buffer;

static inline void
comment_start ()
{
  comment_buffer.utf8_buflen = 0;
  comment_buffer.utf16_surr = 0;
  comment_buffer.curr_buflen = 0;
}

static inline bool
comment_at_start ()
{
  return (comment_buffer.utf8_buflen == 0 && comment_buffer.utf16_surr == 0
	  && comment_buffer.curr_buflen == 0);
}

static inline void
comment_add (int c)
{
  string_buffer_append (&comment_buffer, c);
}

static inline void
comment_line_end (size_t chars_to_remove)
{
  char *buffer = string_buffer_result (&comment_buffer);
  size_t buflen = strlen (buffer);

  buflen -= chars_to_remove;
  while (buflen >= 1
	 && (buffer[buflen - 1] == ' ' || buffer[buflen - 1] == '\t'))
    --buflen;
  buffer[buflen] = '\0';
  savable_comment_add (buffer);
}


/* These are for tracking whether comments count as immediately before
   keyword.  */
static int last_comment_line;
static int last_non_comment_line;


/* Replace each comment that is not inside a character constant or string
   literal with a space or newline character.  */

static int
phase4_getc ()
{
  int c0;
  int c;
  bool last_was_star;

  c0 = phase3_getc ();
  if (RED (c0) != '/')
    return c0;
  c = phase3_getc ();
  switch (RED (c))
    {
    default:
      phase3_ungetc (c);
      return c0;

    case '*':
      /* C style comment.  */
      comment_start ();
      last_was_star = false;
      for (;;)
	{
	  c = phase3_getc ();
	  if (c == P2_EOF)
	    break;
	  /* We skip all leading white space, but not EOLs.  */
	  if (!(comment_at_start () && (RED (c) == ' ' || RED (c) == '\t')))
	    comment_add (c);
	  switch (RED (c))
	    {
	    case '\n':
	      comment_line_end (1);
	      comment_start ();
	      last_was_star = false;
	      continue;

	    case '*':
	      last_was_star = true;
	      continue;

	    case '/':
	      if (last_was_star)
		{
		  comment_line_end (2);
		  break;
		}
	      /* FALLTHROUGH */

	    default:
	      last_was_star = false;
	      continue;
	    }
	  break;
	}
      last_comment_line = line_number;
      return ' ';

    case '/':
      /* C++ style comment.  */
      last_comment_line = line_number;
      comment_start ();
      for (;;)
	{
	  c = phase3_getc ();
	  if (RED (c) == '\n' || c == P2_EOF)
	    break;
	  /* We skip all leading white space, but not EOLs.  */
	  if (!(comment_at_start () && (RED (c) == ' ' || RED (c) == '\t')))
	    comment_add (c);
	}
      phase3_ungetc (c); /* push back the newline, to decrement line_number */
      comment_line_end (0);
      phase3_getc (); /* read the newline again */
      return '\n';
    }
}

/* Supports only one pushback character.  */
static void
phase4_ungetc (int c)
{
  phase3_ungetc (c);
}


/* ========================== Reading of tokens.  ========================== */

enum token_type_ty
{
  token_type_eof,
  token_type_lparen,		/* ( */
  token_type_rparen,		/* ) */
  token_type_lbrace,		/* { */
  token_type_rbrace,		/* } */
  token_type_comma,		/* , */
  token_type_dot,		/* . */
  token_type_string_literal,	/* "abc" */
  token_type_number,		/* 1.23 */
  token_type_symbol,		/* identifier, keyword, null */
  token_type_plus,		/* + */
  token_type_other		/* character literal, misc. operator */
};
typedef enum token_type_ty token_type_ty;

typedef struct token_ty token_ty;
struct token_ty
{
  token_type_ty type;
  char *string;		/* for token_type_string_literal, token_type_symbol */
  refcounted_string_list_ty *comment;	/* for token_type_string_literal */
  int line_number;
};


/* Free the memory pointed to by a 'struct token_ty'.  */
static inline void
free_token (token_ty *tp)
{
  if (tp->type == token_type_string_literal || tp->type == token_type_symbol)
    free (tp->string);
  if (tp->type == token_type_string_literal)
    drop_reference (tp->comment);
}


/* Read an escape sequence inside a string literal or character literal.  */
static inline int
do_getc_escaped ()
{
  int c;

  /* Use phase 3, because phase 4 elides comments.  */
  c = phase3_getc ();
  if (c == P2_EOF)
    return UNICODE ('\\');
  switch (RED (c))
    {
    case 'b':
      return UNICODE (0x08);
    case 't':
      return UNICODE (0x09);
    case 'n':
      return UNICODE (0x0a);
    case 'f':
      return UNICODE (0x0c);
    case 'r':
      return UNICODE (0x0d);
    case '"':
      return UNICODE ('"');
    case '\'':
      return UNICODE ('\'');
    case '\\':
      return UNICODE ('\\');
    case '0': case '1': case '2': case '3':
    case '4': case '5': case '6': case '7':
      {
	int n = RED (c) - '0';
	bool maybe3digits = (n < 4);

	c = phase3_getc ();
	if (RED (c) >= '0' && RED (c) <= '7')
	  {
	    n = (n << 3) + (RED (c) - '0');
	    if (maybe3digits)
	      {
		c = phase3_getc ();
		if (RED (c) >= '0' && RED (c) <= '7')
		  n = (n << 3) + (RED (c) - '0');
		else
		  phase3_ungetc (c);
	      }
	  }
	else
	  phase3_ungetc (c);

	return UNICODE (n);
      }
    default:
      /* Invalid escape sequence.  */
      phase3_ungetc (c);
      return UNICODE ('\\');
    }
}

/* Read a string literal or character literal.  */
static void
accumulate_escaped (struct string_buffer *literal, int delimiter)
{
  int c;

  for (;;)
    {
      /* Use phase 3, because phase 4 elides comments.  */
      c = phase3_getc ();
      if (c == P2_EOF || RED (c) == delimiter)
	break;
      if (RED (c) == '\n')
	{
	  phase3_ungetc (c);
	  error_with_progname = false;
	  if (delimiter == '\'')
	    error (0, 0, _("%s:%d: warning: unterminated character constant"),
		   logical_file_name, line_number);
	  else
	    error (0, 0, _("%s:%d: warning: unterminated string constant"),
		   logical_file_name, line_number);
	  error_with_progname = true;
	  break;
	}
      if (RED (c) == '\\')
	c = do_getc_escaped ();
      string_buffer_append (literal, c);
    }
}


/* Combine characters into tokens.  Discard whitespace.  */

static token_ty phase5_pushback[3];
static int phase5_pushback_length;

static void
phase5_get (token_ty *tp)
{
  int c;

  if (phase5_pushback_length)
    {
      *tp = phase5_pushback[--phase5_pushback_length];
      return;
    }
  tp->string = NULL;

  for (;;)
    {
      tp->line_number = line_number;
      c = phase4_getc ();

      if (c == P2_EOF)
	{
	  tp->type = token_type_eof;
	  return;
	}

      switch (RED (c))
	{
	case '\n':
	  if (last_non_comment_line > last_comment_line)
	    savable_comment_reset ();
	  /* FALLTHROUGH */
	case ' ':
	case '\t':
	case '\f':
	  /* Ignore whitespace and comments.  */
	  continue;
	}

      last_non_comment_line = tp->line_number;

      switch (RED (c))
	{
	case '(':
	  tp->type = token_type_lparen;
	  return;

	case ')':
	  tp->type = token_type_rparen;
	  return;

	case '{':
	  tp->type = token_type_lbrace;
	  return;

	case '}':
	  tp->type = token_type_rbrace;
	  return;

	case ',':
	  tp->type = token_type_comma;
	  return;

	case '.':
	  c = phase4_getc ();
	  if (!(RED (c) >= '0' && RED (c) <= '9'))
	    {
	      phase4_ungetc (c);
	      tp->type = token_type_dot;
	      return;
	    }
	  /* FALLTHROUGH */

	case '0': case '1': case '2': case '3': case '4':
	case '5': case '6': case '7': case '8': case '9':
	  {
	    /* Don't need to verify the complicated syntax of integers and
	       floating-point numbers.  We assume a valid Java input.
	       The simplified syntax that we recognize as number is: any
	       sequence of alphanumeric characters, additionally '+' and '-'
	       immediately after 'e' or 'E' except in hexadecimal numbers.  */
	    bool hexadecimal = false;

	    for (;;)
	      {
		c = phase4_getc ();
		if (RED (c) >= '0' && RED (c) <= '9')
		  continue;
		if ((RED (c) >= 'A' && RED (c) <= 'Z')
		    || (RED (c) >= 'a' && RED (c) <= 'z'))
		  {
		    if (RED (c) == 'X' || RED (c) == 'x')
		      hexadecimal = true;
		    if ((RED (c) == 'E' || RED (c) == 'e') && !hexadecimal)
		      {
			c = phase4_getc ();
			if (!(RED (c) == '+' || RED (c) == '-'))
			  phase4_ungetc (c);
		      }
		    continue;
		  }
		if (RED (c) == '.')
		  continue;
		break;
	      }
	    phase4_ungetc (c);
	    tp->type = token_type_number;
	    return;
	  }

	case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': case 'G':
	case 'H': case 'I': case 'J': case 'K': case 'L': case 'M': case 'N':
	case 'O': case 'P': case 'Q': case 'R': case 'S': case 'T': case 'U':
	case 'V': case 'W': case 'X': case 'Y': case 'Z':
	case '_':
	case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': case 'g':
	case 'h': case 'i': case 'j': case 'k': case 'l': case 'm': case 'n':
	case 'o': case 'p': case 'q': case 'r': case 's': case 't': case 'u':
	case 'v': case 'w': case 'x': case 'y': case 'z':
	  /* Although Java allows identifiers containing many Unicode
	     characters, we recognize only identifiers consisting of ASCII
	     characters.  This avoids conversion hassles w.r.t. the --keyword
	     arguments, and shouldn't be a big problem in practice.  */
	  {
	    static char *buffer;
	    static int bufmax;
	    int bufpos = 0;
	    for (;;)
	      {
		if (bufpos >= bufmax)
		  {
		    bufmax = 2 * bufmax + 10;
		    buffer = xrealloc (buffer, bufmax);
		  }
		buffer[bufpos++] = RED (c);
		c = phase4_getc ();
		if (!((RED (c) >= 'A' && RED (c) <= 'Z')
		      || (RED (c) >= 'a' && RED (c) <= 'z')
		      || (RED (c) >= '0' && RED (c) <= '9')
		      || RED (c) == '_'))
		  break;
	      }
	    phase4_ungetc (c);
	    if (bufpos >= bufmax)
	      {
		bufmax = 2 * bufmax + 10;
		buffer = xrealloc (buffer, bufmax);
	      }
	    buffer[bufpos] = '\0';
	    tp->string = xstrdup (buffer);
	    tp->type = token_type_symbol;
	    return;
	  }

	case '"':
	  /* String literal.  */
	  {
	    struct string_buffer literal;

	    init_string_buffer (&literal);
	    accumulate_escaped (&literal, '"');
	    tp->string = xstrdup (string_buffer_result (&literal));
	    free_string_buffer (&literal);
	    tp->comment = add_reference (savable_comment);
	    tp->type = token_type_string_literal;
	    return;
	  }

	case '\'':
	  /* Character literal.  */
	  {
	    struct string_buffer literal;

	    init_string_buffer (&literal);
	    accumulate_escaped (&literal, '\'');
	    free_string_buffer (&literal);
	    tp->type = token_type_other;
	    return;
	  }

	case '+':
	  c = phase4_getc ();
	  if (RED (c) == '+')
	    /* Operator ++ */
	    tp->type = token_type_other;
	  else if (RED (c) == '=')
	    /* Operator += */
	    tp->type = token_type_other;
	  else
	    {
	      /* Operator + */
	      phase4_ungetc (c);
	      tp->type = token_type_plus;
	    }
	  return;

	default:
	  /* Misc. operator.  */
	  tp->type = token_type_other;
	  return;
	}
    }
}

/* Supports 3 tokens of pushback.  */
static void
phase5_unget (token_ty *tp)
{
  if (tp->type != token_type_eof)
    {
      if (phase5_pushback_length == SIZEOF (phase5_pushback))
	abort ();
      phase5_pushback[phase5_pushback_length++] = *tp;
    }
}


/* Compile-time optimization of string literal concatenation.
   Combine "string1" + ... + "stringN" to the concatenated string if
     - the token before this expression is not ')' (because then the first
       string could be part of a cast expression),
     - the token after this expression is not '.' (because then the last
       string could be part of a method call expression).  */

static token_ty phase6_pushback[2];
static int phase6_pushback_length;

static token_type_ty phase6_last;

static void
phase6_get (token_ty *tp)
{
  if (phase6_pushback_length)
    {
      *tp = phase6_pushback[--phase6_pushback_length];
      return;
    }

  phase5_get (tp);
  if (tp->type == token_type_string_literal && phase6_last != token_type_rparen)
    {
      char *sum = tp->string;
      size_t sum_len = strlen (sum);

      for (;;)
	{
	  token_ty token2;

	  phase5_get (&token2);
	  if (token2.type == token_type_plus)
	    {
	      token_ty token3;

	      phase5_get (&token3);
	      if (token3.type == token_type_string_literal)
		{
		  token_ty token_after;

		  phase5_get (&token_after);
		  if (token_after.type != token_type_dot)
		    {
		      char *addend = token3.string;
		      size_t addend_len = strlen (addend);

		      sum = (char *) xrealloc (sum, sum_len + addend_len + 1);
		      memcpy (sum + sum_len, addend, addend_len + 1);
		      sum_len += addend_len;

		      phase5_unget (&token_after);
		      free_token (&token3);
		      free_token (&token2);
		      continue;
		    }
		  phase5_unget (&token_after);
		}
	      phase5_unget (&token3);
	    }
	  phase5_unget (&token2);
	  break;
	}
      tp->string = sum;
    }
  phase6_last = tp->type;
}

/* Supports 2 tokens of pushback.  */
static void
phase6_unget (token_ty *tp)
{
  if (tp->type != token_type_eof)
    {
      if (phase6_pushback_length == SIZEOF (phase6_pushback))
	abort ();
      phase6_pushback[phase6_pushback_length++] = *tp;
    }
}


static void
x_java_lex (token_ty *tp)
{
  phase6_get (tp);
}

/* Supports 2 tokens of pushback.  */
static void
x_java_unlex (token_ty *tp)
{
  phase6_unget (tp);
}


/* ========================= Extracting strings.  ========================== */


/* Context lookup table.  */
static flag_context_list_table_ty *flag_context_list_table;


/* The file is broken into tokens.  Scan the token stream, looking for
   a keyword, followed by a left paren, followed by a string.  When we
   see this sequence, we have something to remember.  We assume we are
   looking at a valid C or C++ program, and leave the complaints about
   the grammar to the compiler.

     Normal handling: Look for
       keyword ( ... msgid ... )
     Plural handling: Look for
       keyword ( ... msgid ... msgid_plural ... )

   We use recursion because the arguments before msgid or between msgid
   and msgid_plural can contain subexpressions of the same form.  */


/* Extract messages until the next balanced closing parenthesis or brace,
   depending on TERMINATOR.
   Extracted messages are added to MLP.
   When a specific argument shall be extracted, COMMAS_TO_SKIP >= 0 and,
   if also a plural argument shall be extracted, PLURAL_COMMAS > 0,
   otherwise PLURAL_COMMAS = 0.
   When no specific argument shall be extracted, COMMAS_TO_SKIP < 0.
   Return true upon eof, false upon closing parenthesis or brace.  */
static bool
extract_parenthesized (message_list_ty *mlp, token_type_ty terminator,
		       flag_context_ty outer_context,
		       flag_context_list_iterator_ty context_iter,
		       int commas_to_skip, int plural_commas)
{
  /* Remember the message containing the msgid, for msgid_plural.  */
  message_ty *plural_mp = NULL;

  /* 0 when no keyword has been seen.  1 right after a keyword is seen.  */
  int state;
  /* Parameters of the keyword just seen.  Defined only in state 1.  */
  int next_commas_to_skip = -1;
  int next_plural_commas = 0;
  /* Context iterator that will be used if the next token is a '('.  */
  flag_context_list_iterator_ty next_context_iter =
    passthrough_context_list_iterator;
  /* Current context.  */
  flag_context_ty inner_context =
    inherited_context (outer_context,
		       flag_context_list_iterator_advance (&context_iter));

  /* Start state is 0.  */
  state = 0;

  for (;;)
    {
      token_ty token;

      x_java_lex (&token);
      switch (token.type)
	{
	case token_type_symbol:
	  {
	    /* Combine symbol1 . ... . symbolN to a single strings, so that
	       we can recognize static function calls like
	       GettextResource.gettext.  The information present for
	       symbolI.....symbolN has precedence over the information for
	       symbolJ.....symbolN with J > I.  */
	    char *sum = token.string;
	    size_t sum_len = strlen (sum);
	    const char *dottedname;
	    flag_context_list_ty *context_list;

	    for (;;)
	      {
		token_ty token2;

		x_java_lex (&token2);
		if (token2.type == token_type_dot)
		  {
		    token_ty token3;

		    x_java_lex (&token3);
		    if (token3.type == token_type_symbol)
		      {
			char *addend = token3.string;
			size_t addend_len = strlen (addend);

			sum =
			  (char *) xrealloc (sum, sum_len + 1 + addend_len + 1);
			sum[sum_len] = '.';
			memcpy (sum + sum_len + 1, addend, addend_len + 1);
			sum_len += 1 + addend_len;

			free_token (&token3);
			free_token (&token2);
			continue;
		      }
		    x_java_unlex (&token3);
		  }
		x_java_unlex (&token2);
		break;
	      }

	    for (dottedname = sum;;)
	      {
		void *keyword_value;

		if (find_entry (&keywords, dottedname, strlen (dottedname),
				&keyword_value)
		    == 0)
		  {
		    int argnum1 = (int) (long) keyword_value & ((1 << 10) - 1);
		    int argnum2 = (int) (long) keyword_value >> 10;

		    next_commas_to_skip = argnum1 - 1;
		    next_plural_commas = (argnum2 > argnum1 ? argnum2 - argnum1 : 0);
		    state = 1;
		    break;
		  }

		dottedname = strchr (dottedname, '.');
		if (dottedname == NULL)
		  {
		    state = 0;
		    break;
		  }
		dottedname++;
	      }

	    for (dottedname = sum;;)
	      {
		context_list =
		  flag_context_list_table_lookup (
		    flag_context_list_table,
		    dottedname, strlen (dottedname));
		if (context_list != NULL)
		  break;

		dottedname = strchr (dottedname, '.');
		if (dottedname == NULL)
		  break;
		dottedname++;
	      }
	    next_context_iter = flag_context_list_iterator (context_list);

	    free (sum);
	    continue;
	  }

	case token_type_lparen:
	  if (extract_parenthesized (mlp, token_type_rparen,
				     inner_context, next_context_iter,
				     state ? next_commas_to_skip : -1,
				     state ? next_plural_commas : 0))
	    return true;
	  next_context_iter = null_context_list_iterator;
	  state = 0;
	  continue;

	case token_type_rparen:
	  if (terminator == token_type_rparen)
	    return false;
	  if (terminator == token_type_rbrace)
	    {
	      error_with_progname = false;
	      error (0, 0,
		     _("%s:%d: warning: ')' found where '}' was expected"),
		     logical_file_name, token.line_number);
	      error_with_progname = true;
	    }
	  next_context_iter = null_context_list_iterator;
	  state = 0;
	  continue;

	case token_type_lbrace:
	  if (extract_parenthesized (mlp, token_type_rbrace,
				     null_context, null_context_list_iterator,
				     -1, 0))
	    return true;
	  next_context_iter = null_context_list_iterator;
	  state = 0;
	  continue;

	case token_type_rbrace:
	  if (terminator == token_type_rbrace)
	    return false;
	  if (terminator == token_type_rparen)
	    {
	      error_with_progname = false;
	      error (0, 0,
		     _("%s:%d: warning: '}' found where ')' was expected"),
		     logical_file_name, token.line_number);
	      error_with_progname = true;
	    }
	  next_context_iter = null_context_list_iterator;
	  state = 0;
	  continue;

	case token_type_comma:
	  if (commas_to_skip >= 0)
	    {
	      if (commas_to_skip > 0)
		commas_to_skip--;
	      else
		if (plural_mp != NULL && plural_commas > 0)
		  {
		    commas_to_skip = plural_commas - 1;
		    plural_commas = 0;
		  }
		else
		  commas_to_skip = -1;
	    }
	  inner_context =
	    inherited_context (outer_context,
			       flag_context_list_iterator_advance (
				 &context_iter));
	  next_context_iter = passthrough_context_list_iterator;
	  state = 0;
	  continue;

	case token_type_string_literal:
	  {
	    lex_pos_ty pos;
	    pos.file_name = logical_file_name;
	    pos.line_number = token.line_number;

	    if (extract_all)
	      {
		xgettext_current_source_encoding = po_charset_utf8;
		savable_comment_to_xgettext_comment (token.comment);
		remember_a_message (mlp, token.string, inner_context, &pos);
		savable_comment_reset ();
		xgettext_current_source_encoding = xgettext_global_source_encoding;
	      }
	    else
	      {
		if (commas_to_skip == 0)
		  {
		    if (plural_mp == NULL)
		      {
			/* Seen an msgid.  */
			message_ty *mp;

			xgettext_current_source_encoding = po_charset_utf8;
			savable_comment_to_xgettext_comment (token.comment);
			mp = remember_a_message (mlp, token.string,
						 inner_context, &pos);
			savable_comment_reset ();
			xgettext_current_source_encoding = xgettext_global_source_encoding;
			if (plural_commas > 0)
			  plural_mp = mp;
		      }
		    else
		      {
			/* Seen an msgid_plural.  */
			xgettext_current_source_encoding = po_charset_utf8;
			remember_a_message_plural (plural_mp, token.string,
						   inner_context, &pos);
			xgettext_current_source_encoding = xgettext_global_source_encoding;
			plural_mp = NULL;
		      }
		  }
		else
		  free (token.string);
	      }
	  }
	  drop_reference (token.comment);
	  next_context_iter = null_context_list_iterator;
	  state = 0;
	  continue;

	case token_type_eof:
	  return true;

	case token_type_dot:
	case token_type_number:
	case token_type_plus:
	case token_type_other:
	  next_context_iter = null_context_list_iterator;
	  state = 0;
	  continue;

	default:
	  abort ();
	}
    }
}


void
extract_java (FILE *f,
	      const char *real_filename, const char *logical_filename,
	      flag_context_list_table_ty *flag_table,
	      msgdomain_list_ty *mdlp)
{
  message_list_ty *mlp = mdlp->item[0]->messages;

  fp = f;
  real_file_name = real_filename;
  logical_file_name = xstrdup (logical_filename);
  line_number = 1;

  last_comment_line = -1;
  last_non_comment_line = -1;

  phase6_last = token_type_eof;

  flag_context_list_table = flag_table;

  init_keywords ();

  /* Eat tokens until eof is seen.  When extract_parenthesized returns
     due to an unbalanced closing parenthesis, just restart it.  */
  while (!extract_parenthesized (mlp, token_type_eof,
				 null_context, null_context_list_iterator,
				 -1, 0))
    ;

  fp = NULL;
  real_file_name = NULL;
  logical_file_name = NULL;
  line_number = 0;
}
