#!/usr/bin/awk -f
#
# Convert forth source files to a giant C string
#
# Joe Abley <jabley@patho.gen.nz>, 12 January 1999
#
# 02-oct-1999:  Cleaned up awk slightly; added some additional logic
#               suggested by dcs to compress the stored forth program.
#
# Note! This script uses strftime() which is a gawk-ism, and the
# POSIX [[:space:]] character class.
#
# $FreeBSD: src/sys/boot/ficl/softwords/softcore.awk,v 1.3.2.2 2001/03/04 04:55:10 obrien Exp $
# $DragonFly: src/sys/boot/ficl/softwords/softcore.awk,v 1.2 2003/06/17 04:28:18 dillon Exp $

BEGIN \
{
  printf "/***************************************************************\n";
  printf "** s o f t c o r e . c\n";
  printf "** Forth Inspired Command Language -\n";
  printf "** Words from CORE set written in FICL\n";
  printf "** Author: John Sadler (john_sadler@alum.mit.edu)\n";
  printf "** Created: 27 December 1997\n";
  printf "** Last update: %s\n", datestamp;
  printf "***************************************************************/\n";
  printf "\n/*\n";
  printf "** This file contains definitions that are compiled into the\n";
  printf "** system dictionary by the first virtual machine to be created.\n";
  printf "** Created automagically by ficl/softwords/softcore.awk\n";
  printf "*/\n";
  printf "\n#include \"ficl.h\"\n";
  printf "\nstatic char softWords[] =\n";

  commenting = 0;
}

# some general early substitutions
{
  gsub(/\t/, "    ");			# replace each tab with 4 spaces
  gsub(/\"/, "\\\"");			# escape quotes
  gsub(/\\[[:space:]]+$/, "");		# toss empty comments
}

# strip out empty lines
/^ *$/ \
{
  next;
}

# emit / ** lines as multi-line C comments
/^\\[[:space:]]\*\*/ \
{
  sub(/^\\[[:space:]]/, "");
  if (commenting == 0) printf "/*\n";
  printf "%s\n", $0;
  commenting = 1;
  next;
}

# strip blank lines
/^[[:space:]]*$/ \
{
  next;
}

# function to close a comment, used later
function end_comments()
{
  commenting = 0;
  printf "*/\n";
}

# pass commented preprocessor directives
/^\\[[:space:]]#/ \
{
  if (commenting) end_comments();
  sub(/^\\[[:space:]]/, "");
  printf "%s\n", $0;
  next;
}

# toss all other full-line \ comments
/^\\/ \
{
  if (commenting) end_comments();
  next;
}

# lop off trailing \ comments
/\\[[:space:]]+/ \
{
  sub(/\\[[:space:]]+.*$/, "");
}

# expunge ( ) comments
/[[:space:]]+\([[:space:]][^)]*\)/ \
{
  sub(/[[:space:]]+\([[:space:]][^)]*\)/, "");
}

# remove leading spaces
/^[[:space:]]+/ \
{
  sub(/^[[:space:]]+/, "");
}

# removing trailing spaces
/[[:space:]]+$/ \
{
  sub(/[[:space:]]+$/, "");
}

# strip out empty lines again (preceding rules may have generated some)
/^[[:space:]]*$/ \
{
  if (commenting) end_comments();
  next;
}

# emit all other lines as quoted string fragments
{
  if (commenting) end_comments();

  printf "    \"%s \"\n", $0;
  next;
}

END \
{
  if (commenting) end_comments();
  printf "    \"quit \";\n";
  printf "\n\nvoid ficlCompileSoftCore(FICL_VM *pVM)\n";
  printf "{\n";
  printf "    assert(ficlExec(pVM, softWords) != VM_ERREXIT);\n";
  printf "}\n";
}