#!/usr/bin/fontforge -lang=ff

#
# Copyright (C) 2013 Matthew Skala
#
# This file is part of FontForge.
#
# FontForge 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 3 of the License, or
# (at your option) any later version.
#
# FontForge 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 FontForge.  If not, see <http://www.gnu.org/licenses/>.
#
# For more details see the COPYING.gplv3 file in the root directory of this
# distribution.
#
# Based on the Tsukurimashou Project's fontlint script (same author).
#

# Things to check for:
#   check_for[i][0] is 0, 1, or 2, for don't check, warn, or fatal
#   check_for[i][1] is a string message
#   check_for[0]..[31] refer to LSB to MSB of Validate() return
#   check_for[32]..[63] refer to LSB to MSB of $loadState
#   check_for[64]..[95] refer to LSB to MSB of $privateState
#   check_for[96]..[whatever] are sequentially assigned other things

# note: to work around a bug in FontForge (multidimensional arrays being
# horribly broken), check_for[i][j] is actually stored as check_for[2*i+j]

check_for=[ \
  1,"Unknown Validate() return bit 0x1", \
  2,"Open contour", \
  2,"Self-intersecting glyph", \
  2,"Wrong direction", \
  2,"Flipped reference", \
  2,"Missing points at extrema", \
  2,"Unknown glyph referenced in GSUB/GPOS/MATH", \
  2,"More points in a glyph than PostScript allows", \
  2,"Too many hints", \
  2,"Bad glyph name", \
  2,"More points in a glyph than specified in 'maxp'", \
  2,"More paths in a glyph than specified in 'maxp'", \
  2,"More points in a composite glyph than specified in 'maxp'", \
  2,"More paths in a composite glyph than specified in 'maxp'", \
  2,"Instructions longer than allowed in 'maxp'", \
  2,"More references in a glyph than specified in 'maxp'", \
  2,"References nested more deeply than specified in 'maxp'", \
  1,"The 'prep' or 'fpgm' tables are longer than specified in 'maxp'\n" \
   +"             (may not be an error)", \
  2,"Adjacent points too far apart in a glyph", \
  2,"Non-integral coordinates in a glyph", \
  1,"A glyph uses at least one, but not all, anchor classes in a\n" \
   +"             subtable (may not be an error)", \
  2,"Two glyphs have the same name", \
  2,"Two glyphs have the same Unicode code point", \
  2,"Overlapping hints in a glyph", \
  1,"Unknown Validate() return bit 0x1000000", \
  1,"Unknown Validate() return bit 0x2000000", \
  1,"Unknown Validate() return bit 0x4000000", \
  1,"Unknown Validate() return bit 0x8000000", \
  1,"Unknown Validate() return bit 0x10000000", \
  1,"Unknown Validate() return bit 0x20000000", \
  1,"Unknown Validate() return bit 0x40000000", \
  1,"Unknown Validate() return bit 0x80000000", \
  2,"Bad PostScript fontname entry in the 'name' table", \
  2,"Bad 'glyf' or 'loca' table", \
  2,"Bad 'CFF ' table", \
  2,"Bad 'hhea', 'hmtx', 'vhea' or 'vmtx' table", \
  2,"Bad 'cmap' table", \
  2,"Bad 'EBDT', 'bdat', 'EBLC' or 'bloc' (embedded bitmap) table", \
  2,"Bad Apple GX advanced typography table", \
  2,"Bad OpenType advanced typography table", \
  2,"Bad version number in OS/2 table (must be >0, and must be >1 for\n" \
   +"             OT-CFF fonts)", \
  2,"Bad sfnt file header", \
  1,"Unknown loadState bit 0x400", \
  1,"Unknown loadState bit 0x800", \
  1,"Unknown loadState bit 0x1000", \
  1,"Unknown loadState bit 0x2000", \
  1,"Unknown loadState bit 0x4000", \
  1,"Unknown loadState bit 0x8000", \
  1,"Unknown loadState bit 0x10000", \
  1,"Unknown loadState bit 0x20000", \
  1,"Unknown loadState bit 0x40000", \
  1,"Unknown loadState bit 0x80000", \
  1,"Unknown loadState bit 0x100000", \
  1,"Unknown loadState bit 0x200000", \
  1,"Unknown loadState bit 0x400000", \
  1,"Unknown loadState bit 0x800000", \
  1,"Unknown loadState bit 0x1000000", \
  1,"Unknown loadState bit 0x2000000", \
  1,"Unknown loadState bit 0x4000000", \
  1,"Unknown loadState bit 0x8000000", \
  1,"Unknown loadState bit 0x1000000", \
  1,"Unknown loadState bit 0x20000000", \
  1,"Unknown loadState bit 0x40000000", \
  1,"Unknown loadState bit 0x80000000", \
  2,"Odd number of elements in either the BlueValues or OtherBlues\n" \
   +"             entries in the PostScript Private dictionary", \
  2,"Disordered elements in either the BlueValues or OtherBlues\n" \
   +"             entries in the PostScript Private dictionary", \
  2,"Too many elements in either the BlueValues or OtherBlues entries\n" \
   +"             in the PostScript Private dictionary", \
  2,"Elements too close in either the BlueValues or OtherBlues\n" \
   +"             entries in the PostScript Private dictionary (must " \
   +"be at least\n             2*BlueFuzz+1 apart)", \
  2,"Non-integral elements in either the BlueValues or OtherBlues\n" \
   +"             entries in the PostScript Private dictionary", \
  2,"Alignment zone height in either the BlueValues or OtherBlues is\n" \
   +"             too big for the BlueScale in the PostScript Private " \
   +"dictionary", \
  1,"Unknown privateState bit 0x40", \
  1,"Unknown privateState bit 0x80", \
  2,"Odd number of elements in either the FamilyBlues or\n" \
   +"             FamilyOtherBlues entries in the PostScript Private " \
   +"dictionary", \
  2,"Disordered elements in either the FamilyBlues or\n" \
   +"             FamilyOtherBlues entries in the PostScript Private " \
   +"dictionary", \
  2,"Too many elements in either the FamilyBlues or FamilyOtherBlues\n" \
   +"             entries in the PostScript Private dictionary", \
  2,"Elements too close in either the FamilyBlues or\n" \
   +"             FamilyOtherBlues entries in the PostScript Private " \
   +"dictionary\n             (must be at least 2*BlueFuzz+1 apart)", \
  2,"Non-integral elements in either the FamilyBlues or\n" \
   +"             FamilyOtherBlues entries in the PostScript Private " \
   +"dictionary", \
  2,"Alignment zone height in either the FamilyBlues or\n" \
   +"             FamilyOtherBlues is too big for the BlueScale in " \
   +"the PostScript\n             Private dictionary", \
  1,"Unknown privateState bit 0x4000", \
  1,"Unknown privateState bit 0x8000", \
  2,"Missing BlueValues entry in PostScript Private dictionary", \
  2,"Bad BlueFuzz entry in PostScript Private dictionary", \
  2,"Bad BlueScale entry in PostScript Private dictionary", \
  2,"Bad StdHW entry in PostScript Private dictionary", \
  2,"Bad StdVW entry in PostScript Private dictionary", \
  2,"Bad StemSnapH entry in PostScript Private dictionary", \
  2,"Bad StemSnapV entry in PostScript Private dictionary", \
  2,"StemSnapH does not contain StdHW value in PostScript Private\n" \
   +"             dictionary", \
  2,"StemSnapV does not contain StdVW value in PostScript Private\n" \
   +"             dictionary", \
  2,"Bad BlueShift entry in PostScript Private dictionary", \
  1,"Unknown privateState bit 0x4000000", \
  1,"Unknown privateState bit 0x8000000", \
  1,"Unknown privateState bit 0x1000000", \
  1,"Unknown privateState bit 0x20000000", \
  1,"Unknown privateState bit 0x40000000", \
  1,"Unknown privateState bit 0x80000000", \
  0,"Missing BlueValues entry (issue #80) when the font is quadratic\n" \
   +"             (overrides general setting)", \
  0,"Non-integral coordinates (issue #19) when the font is cubic\n" \
   +"             (overrides general setting)", \
  2,"Self-intersecting glyph (issue #2) when FontForge is able to\n" \
   +"             correct this (overrides general setting)", \
  1,"Flags in the OS/2 table say the font is non-free" \
];

# display usage message
usage_message= \
  "\nfontlint [OPTIONS] {fontfile} ...\n" \
 +"  Validates the listed fonts\n\n" \
 +"Options accepted:\n" \
 +"  -f, --fatal ISSUES    treat ISSUES as fatal errors\n" \
 +"  -i, --ignore ISSUES   ignore ISSUES\n" \
 +"  -h, --help            display help\n" \
 +"  -l, --list            list issues, their numbers, and disposition\n" \
 +"  -w, --warning ISSUES  treat ISSUES as warnings\n\n" \
 +"Lists of ISSUES may include comma-separated numbers and ranges, like\n" \
 +"  1,2,5,8-21,24-29,48\n";
if ($argc<=1)
  Print(usage_message);
  Quit(1);
endif

# process command line
allowing_options=1;
any_fatal=0;
while ($argc>1)
  # handle -- to terminate option processing
  if ($argv[1]=='--')
    allowing_options=0;

  # handle options
  elseif (allowing_options && (Strsub($argv[1]+' ',0,1)=='-'))
    arg_type=-1;

    # make issues into fatal errors
    if ((Strsub($argv[1]+'  ',0,2)=='-f') \
     || (Strsub($argv[1]+'   ',1,3)=='-f'))
      arg_type=2;
      
    # explicit request for help message
    elseif ((Strsub($argv[1]+'  ',0,2)=='-h') \
         || (Strsub($argv[1]+'   ',1,3)=='-h'))
      Print(usage_message);

    # make issues ignored
    elseif ((Strsub($argv[1]+'  ',0,2)=='-i') \
         || (Strsub($argv[1]+'   ',1,3)=='-i'))
      arg_type=0;
      
    # list current configuration
    elseif ((Strsub($argv[1]+'  ',0,2)=='-l') \
         || (Strsub($argv[1]+'   ',1,3)=='-l'))
      Print("INFO         Here are all the currently-checked issues and " \
           +"their status");
      i=0;
      while (i<SizeOf(check_for)/2)
        istr="   "+ToString(i);
        istr=Strsub(istr,Strlen(istr)-3);
        if (check_for[i*2]==0)
          Print("IGNORED  "+istr+" "+check_for[i*2+1]);
        elseif (check_for[i*2]==1)
          Print("WARNING  "+istr+" "+check_for[i*2+1]);
        elseif (check_for[i*2]==2)
          Print("ERROR    "+istr+" "+check_for[i*2+1]);
        endif
        i=i+1;
      endloop
      Print();

    # make issues into warnings
    elseif ((Strsub($argv[1]+'  ',0,2)=='-w') \
         || (Strsub($argv[1]+'   ',1,3)=='-w'))
      arg_type=1;

    else
      Print("ERROR        Unknown option "+$argv[1]);
      any_fatal=1;
    endif

    # process fatal/ignore/warn options, which share syntax
    if (arg_type>=0)
      i=0;
      while (i<Strlen($argv[1]))
        if (IsDigit(Strsub($argv[1],i,i+1)))
          break;
        endif
        i=i+1;
      endloop
      if (i<Strlen($argv[1]))
        optarg=Strsub($argv[1],i);
      else
        shift;
        optarg=$argv[1];
      endif
      subargs=StrSplit(optarg,',');
      i=0;
      while (i<SizeOf(subargs))
        rangevals=StrSplit(subargs[i],'-');
        if (SizeOf(rangevals)==1)
          check_for[Strtol(rangevals[0])*2]=arg_type;
        elseif ((SizeOf(rangevals)==2) \
             && (Strtol(rangevals[1])>=Strtol(rangevals[0])))
          j=Strtol(rangevals[0]);
          while (j<=Strtol(rangevals[1]))
            check_for[j*2]=arg_type;
            j=j+1;
          endloop
        else
        endif
        i=i+1;
      endloop
    endif

  # handle filenames
  else
    Print("CHECKING     "+$argv[1]);
    fatal_here=0;
    
    Open($argv[1],9);
    ls_result=$loadState;
    v_result=Validate();
    ps_result=$privateState;
    
    i=0;
    ibit=1;
    test_result=v_result;
    while (i<96)
      if (i==32)
        test_result=ls_result;
        ibit=1;
      elseif (i==64)
        test_result=ps_result;
        ibit=1;
      endif
    
      if (test_result & ibit)

        # handle overrides
        if ((i==2) && (check_for[2*2]!=check_for[98*2]))
          Print("CHECKING  98 "+check_for[98*2+1]);
          SelectAll();
          FindIntersections();
          RemoveOverlap();
          if (Validate()&0x4)
            ci=i;
          else
            ci=98;
          endif
        elseif ((i==19) && ($order==3))
          ci=97;
        elseif ((i==80) && ($order==2))
          ci=96;
        else
          ci=i;
        endif

        istr="   "+ToString(ci);
        istr=Strsub(istr,Strlen(istr)-3);
        if (check_for[2*ci]==1)
          Print("WARNING  "+istr+" "+check_for[ci*2+1]);
        elseif (check_for[2*ci]==2)
          Print("ERROR    "+istr+" "+check_for[ci*2+1]);
          fatal_here=1;
        endif
      endif

      i=i+1;
      ibit=ibit*2;
    endloop
    
    if (GetOS2Value("FSType")!=0)
      if (check_for[2*99]==1)
        Print("WARNING   99 "+check_for[99*2+1]);
      elseif (check_for[2*99]==2)
        Print("ERROR     99 "+check_for[99*2+1]);
        any_fatal=1;
      endif
    endif

    Close();

    if (fatal_here)
      Print("FAIL         "+$argv[1]);
      any_fatal=1;
    else
      Print("PASS         "+$argv[1]);
    endif
    Print("");
  endif

  shift;
endloop

Quit(any_fatal);