mpw-tools/flags.rb

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#!/usr/bin/env ruby -w
# process the flags.yaml file
# and generate a flags.h and flags.c file.
#
#
# todo -- support for long-options (--longoption, --longoption=value, etc)
#
#
require 'erb'
require 'yaml'
header_preamble = <<EOF
#ifndef __flags_h__
#define __flags_h__
typedef struct Flags {
EOF
header_postamble = <<EOF
} Flags;
extern struct Flags flags;
int FlagsParse(int argc, char **argv);
void FlagsHelp(void);
#endif
EOF
class Option
@@map = {
# some of these are a bad idea but whatever...
'>' => 'gt',
'<' => 'lt',
',' => 'comma',
'.' => 'period',
'/' => 'forward_slash',
'\\' => 'back_slash',
'?' => 'question',
'|' => 'pipe',
'~' => 'tilde',
'`' => 'grave',
'!' => 'bang',
'@' => 'at',
'#' => 'hash',
'$' => 'dollar',
'%' => 'percent',
'^' => 'caret',
'&' => 'ampersand',
'*' => 'star',
'(' => 'left_paren',
')' => 'right_paren',
'-' => 'minus',
'+' => 'plus',
'=' => 'equal',
'[' => 'left_bracket',
']' => 'right_bracket',
'{' => 'left_brace',
'}' => 'right_brace',
':' => 'colon',
';' => 'semi_colon',
'\'' => 'apostrophe',
'"' => 'quote'
}
def initialize(hash)
@char = hash['char'].to_s
@argument = hash['argument'] || false
@flag_name = hash['flag_name']
@flag_name = @flag_name.to_s if @flag_name
@xor = hash['xor'] || []
@xor = case @xor
when Array
@xor
when Integer, String
[ @xor ]
else
raise "Invalid xor type: #{@xor}"
end
@xor.map! { |x| x.to_s }
end
attr_reader :char, :xor, :argument
def flag_name
return @flag_name if @flag_name
return self.class.flag_name(@char)
end
def self.flag_name(char)
return '_' + @@map[char] if @@map[char]
return '_' + char
end
end
# better ARGF.
def argf_each
if ARGV.count > 0
ARGV.each {|file|
File.open(file, "r") {|io|
yield file, io
}
}
else
yield nil, $stdin
end
end
def escape_cstr(x)
# escape a c string
x.gsub(/([\\"])/, "\\\\1")
end
code = ERB.new(DATA.read(), 0, "%<>")
argf_each {|filename, file|
data = YAML.load(file)
help = data['help']
options = data['options']
# options is an array of items which may be hashes, strings, or numbers.
# normalize them.
options = options.map {|opt|
opt = case opt
when String, Integer
{ 'char' => opt }
when Hash
# {'o' => { ... }}
# or
# {'char' => , ... }
if opt['char']
opt
else
opt = opt.first
opt[1].merge({ 'char' => opt[0] })
end
else
raise "Unexpected data type: #{opt}"
end
Option.new(opt)
}
#data[options] = options
# check for help?
basename = filename
basename = $1 if filename && filename =~ /^(.*)\./
b = binding # bind help, options for ERB.
io = basename ? File.open(basename + ".c", "w") : $stdout
io.write(code.result(b))
io.close unless io == $stdout
io = basename ? File.open(basename + ".h", "w") : $stdout
io.write(header_preamble)
# two passes - one with arguments, one without.
options.each {|opt|
if opt.argument
io.printf(" char *%s;\n", opt.flag_name)
end
}
io.puts()
options.each {|opt|
if !opt.argument
io.printf(" unsigned %s:1;\n", opt.flag_name)
end
}
io.puts
io.write(header_postamble)
io.close unless io == $stdout
# #puts options.to_yaml
# puts code.result(binding())
}
__END__
#ifdef __ORCAC__
#pragma optimize 79
#pragma noroot
#endif
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "<%= basename + '.h' %>"
void FlagsHelp(void)
{
% help.each do |h|
fputs("<%= escape_cstr(h) %>\n", stdout);
% end
fputs("\n", stdout);
exit(0);
}
struct Flags flags;
int FlagsParse(int argc, char **argv)
{
char *cp;
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char *optarg;
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char c;
int i;
int j;
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int eof; // end-of-flags
int mindex; // mutation index.
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memset(&flags, 0, sizeof(flags));
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for (i = 1, mindex = 1, eof = 0; i < argc; ++i)
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{
cp = argv[i];
c = cp[0];
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if (c != '-' || eof)
{
if (i != mindex) argv[mindex] = argv[i];
mindex++;
continue;
}
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// -- = end of options.
if (cp[1] == '-' && cp[2] == 0)
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{
eof = 1;
continue;
}
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// now scan all the flags in the string...
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optarg = NULL;
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for (j = 1; ; ++j)
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{
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c = cp[j];
if (c == 0) break;
switch (c)
{
% if help && !options.find_index {|x| x.char == 'h' }
case 'h':
FlagsHelp();
break;
% end
% #
% options.each do |opt|
case '<%= escape_cstr(opt.char) %>':
% # check for an argument.
% flag_name = 'flags.' + opt.flag_name
% #
% if opt.argument
// -xarg or -x arg
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++j;
if (cp[j])
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{
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optarg = cp + j;
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}
else
{
if (++i >= argc)
{
fputs("option requires an argument -- <%= opt.char %>\n", stderr);
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exit(1);
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}
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optarg = argv[i];
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}
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<%= flag_name %> = optarg;
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% else # no argument.
<%= flag_name %> = 1;
% end # if no argument.
% #
% # unset any exclusive or values
% opt.xor.each do |xor_opt|
flags.<%= Option.flag_name(xor_opt) %> = 0;
%end
break;
% end # options.each
default:
fprintf(stderr, "illegal option -- %c\n", c);
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exit(1);
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}
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if (optarg) break;
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}
}
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return mindex;
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}