module TimeDSL
    def second
      self * 1
    end
    alias_method :seconds, :second

    def minute
      self * 60
    end
    alias_method :minutes, :minute

    def hour
      self * 3600
    end
    alias_method :hours, :hour

    def day
      self * 86400
    end
    alias_method :days, :day

    def week
      self * 604800
    end
    alias_method :weeks, :week

    def month
      self * 2592000
    end
    alias_method :months, :month

    def year
      self * 31471200
    end
    alias_method :years, :year
end
Numeric.send :include, TimeDSL

1.hours + 20.minutes # => 一小时20分钟是多少秒
3.days + 5.hours # => 3天零5小时
2.years + 10.months # => 两年十个月

Numeric.send :include, TimeDSL

module BadMetaTimeDSL

    {:second => 1, 
     :minute => 60, 
     :hour => 3600, 
     :day => [24,:hours], 
     :week => [7,:days], 
     :month => [30,:days], 
     :year => [364.25, :days]}.each do |meth, amount|
		define_method "b_#{meth}" do
			amount = amount.is_a?(Array) ? amount[0].send(amount[1]) : amount
			self * amount
		end
		alias_method "b_#{meth}s".intern, "b_#{meth}"
    end
  end
Numeric.send :include, BadMetaTimeDSL

module GoodMetaTimeDSL
  SECOND  = 1
  MINUTE  = SECOND * 60
  HOUR    = MINUTE * 60
  DAY     = HOUR * 24
  WEEK    = DAY * 7
  MONTH   = DAY * 30
  YEAR    = DAY * 364.25

  %w[SECOND MINUTE HOUR DAY WEEK MONTH YEAR].each do |const_name|
      meth = const_name.downcase
      class_eval <<-RUBY
        def g_#{meth}
          self * #{const_name}
        end
        alias g_#{meth}s g_#{meth}
      RUBY
  end
end
Numeric.send :include, GoodMetaTimeDSL

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• Windows7在微软WinHEC 2008上揭开神秘面纱

class Person
    attr_accessor :name, :age
    def initialize(name)
        @name = name
    end
end

logen = Person.new('Logen')
class << logen
    def use_claw
        # ...
    end
end
logen.use_claw

o = Object.new
p o.class # => Object

p Class.superclass.superclass # => Object

p Object.superclass # => nil

1. 在eigenclass查找实例方法
2. 在class中查找实例方法
3. 在每一个被包含的module中查找实例方法
4. 在基类中查找实例方法
5. 触发method_missing方法

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class MyStringBuffer < java.lang.StringBuffer
  def append(v)
  end
end

irb(main):001:0> class A
irb(main):002:1> end
=> nil
irb(main):003:0> class B
irb(main):004:1>   def B.a
irb(main):005:2>     A
irb(main):006:2>   end
irb(main):007:1> end
=> nil
irb(main):008:0> class C < B.a
irb(main):009:1> end
=> nil
irb(main):010:0> C.superclass
=> A

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class java.lang.Integer
  def +(rhs)
    self.int_value() + rhs
  end
end

irb(main):001:0> i = java.lang.Integer.new(1) # OK
irb(main):002:0> i
=> #<Java::JavaLang::Integer:0x1fbc355 @java_object=1>
irb(main):003:0> i.java_class
=> java.lang.Integer
irb(main):004:0> i.int_value
=> 1
irb(main):005:0> i + 2     # not impl'd
=> 3                       # what I'd like to see

irb(main):001:0> java
=> Java::Java
irb(main):002:0> java()
=> Java::Java
irb(main):003:0> com
=> Java::Com
irb(main):004:0> com().sun()
=> Java::ComSun

irb(main):001:0> class Java::JavaLang::Integer # 改了这里
irb(main):002:1>   def +(rhs)
irb(main):003:2>     self.int_value + rhs
irb(main):004:2>   end
irb(main):005:1> end
=> nil
irb(main):006:0> i = java.lang.Integer.new 2
=> #<Java::JavaLang::Integer:0x7efa96 @java_object=2>
irb(main):007:0> i + 3
=> 5

class UIElement
  alias_method :old_render_transform_origin=,
               :render_transform_origin=

  def render_transform_origin=(point)
    self.old_render_transform_origin = Point.new(point.first, point.last)
  end
end

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a.prop[0][1] = a.prop[0][1] + 1;

case '+':
c = nextc();
if (lex_state == EXPR_FNAME || lex_state == EXPR_DOT) {
    lex_state = EXPR_ARG;
    if (c == '@') {
        return tUPLUS;
    }
    pushback(c);
    return '+';
}
if (c == '=') {
    yylval.id = '+';      // 注意这里，id是'+'
    lex_state = EXPR_BEG;
    return tOP_ASGN;      // 然后整体以tOP_ASGN返回
}

statement: //...
    | var_lhs tOP_ASGN command_call
    // ...
    | //...
    ;

var_lhs tOP_ASGN command_call
{
    value_expr($3);
    if ($1) {
        ID vid = $1->nd_vid;
        if ($2 == tOROP) {
            $1->nd_value = $3;
            $$ = NEW_OP_ASGN_OR(gettable(vid), $1);
            if (is_asgn_or_id(vid)) {
                $$->nd_aid = vid;
            }
        }
        else if ($2 == tANDOP) {
            $1->nd_value = $3;
            $$ = NEW_OP_ASGN_AND(gettable(vid), $1);
        }
        else {
            $$ = $1; // 获得var_lhs对应的节点
            // call_op将返回一个NODE_CALL节点，并赋值给var_lhs对应节点的“值”
            $$->nd_value = call_op(gettable(vid),$2,1,$3);
        }
    }
    else {
        $$ = 0;
    }
}

lhs '=' command_call
{
    $$ = node_assign($1, $3);
}

arg '+' arg
{
    $$ = call_op($1, '+', 1, $3);
}

static NODE*
node_assign(lhs, rhs)
    NODE *lhs, *rhs;
{
    if (!lhs) return 0;

    value_expr(rhs);
    switch (nd_type(lhs)) {
      case NODE_GASGN:
      case NODE_IASGN:
      case NODE_LASGN:
      case NODE_DASGN:
      case NODE_DASGN_CURR:
      case NODE_MASGN:
      case NODE_CDECL:
      case NODE_CVDECL:
      case NODE_CVASGN:
        lhs->nd_value = rhs; // 注意这里
        break;

      case NODE_ATTRASGN:
      case NODE_CALL:
        lhs->nd_args = arg_add(lhs->nd_args, rhs);
        break;

      default:
        /* should not happen */
        break;
    }

    return lhs;
}

/*
 * call-seq:
 *   fix + numeric   =>  numeric_result
 *
 * Performs addition: the class of the resulting object depends on
 * the class of <code>numeric</code> and on the magnitude of the
 * result.
 */

static VALUE
fix_plus(x, y)
    VALUE x, y;
{
    if (FIXNUM_P(y)) {
	long a, b, c;
	VALUE r;

	a = FIX2LONG(x);
	b = FIX2LONG(y);
	c = a + b;
	r = LONG2NUM(c);

	return r;
    }
    if (TYPE(y) == T_FLOAT) {
	return rb_float_new((double)FIX2LONG(x) + RFLOAT(y)->value);
    }
    return rb_num_coerce_bin(x, y);
}

rb_define_method(rb_cFixnum, "+", fix_plus, 1);

rb_cFixnum = rb_define_class("Fixnum", rb_cInteger);

if (name[0] != '_' && ISASCII(name[0]) && !ISALNUM(name[0])) {
    /* operators */
    int i;

    for (i=0; op_tbl[i].token; i++) {
        if (*op_tbl[i].name == *name &&
            strcmp(op_tbl[i].name, name) == 0) {
            id = op_tbl[i].token;
            goto id_regist;
        }
    }
}

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FUNCTION=4
NullLiteral=31
WHILE=18
FloatTypeSuffix=38
OctalLiteral=33
CharacterLiteral=28
LBRACE=11
LineComment=44
FOR=19
DO=17
Exponent=37
RelationalOperator=24
HexDigit=35
BREAK=20
Identifier=5
LPAREN=6
IF=16
AssignmentOperator=15
RPAREN=7
CONTINUE=21
Comment=43
COMMA=8
AddOperator=25
RETURN=22
TypeSpecifier=10
VAR=13
HexLiteral=32
RBRACE=12
IntegerTypeSuffix=36
SEMICOLON=14
DecimalLiteral=34
AssignmentShorthandOperator=23
COLON=9
StringLiteral=29
WS=42
UnicodeEscape=40
FloatingPointLiteral=27
MulOperator=26
EscapeSequence=39
OctalEscape=41
BooleanLiteral=30

4=FUNCTION
5=Identifier
6=LPAREN
7=RPAREN
8=COMMA
9=COLON
10=TypeSpecifier
11=LBRACE
12=RBRACE
13=VAR
14=SEMICOLON
15=AssignmentOperator
16=IF
17=DO
18=WHILE
19=FOR
20=BREAK
21=CONTINUE
22=RETURN
23=AssignmentShorthandOperator
24=RelationalOperator
25=AddOperator
26=MulOperator
27=FloatingPointLiteral
28=CharacterLiteral
29=StringLiteral
30=BooleanLiteral
31=NullLiteral
32=HexLiteral
33=OctalLiteral
34=DecimalLiteral
35=HexDigit
36=IntegerTypeSuffix
37=Exponent
38=FloatTypeSuffix
39=EscapeSequence
40=UnicodeEscape
41=OctalEscape
42=WS
43=Comment
44=LineComment

#!/usr/bin/env ruby
# reformat.rb

## Reformat a token file produced by ANTLR to the format:
## token_number=token_name

def reformat( infile, outfile )
  lines = Array.new
  
  File.open infile, "r" do |file|
    file.each do |line|
      lines << "#{$2}=#{$1}" if line.chomp =~ /^([^=]+)=([0-9]+)$/
    end
  end
  
  # yeah, i know this is slow, but we're not
  # pushing for speed anyway
  lines = lines.sort_by do |line|
    line =~ /^[0-9]+/
    $&.to_i
  end
  
  File.open outfile, "w" do |file|
    lines.each { |line| file.puts line }
  end
end

if ARGV.size != 2
  puts "Usage: #{$0} [token file] [output file]"
  exit
end

infile, outfile = ARGV
reformat infile, outfile

#!/usr/bin/env ruby
# reformat.rb

## Reformat a token file produced by ANTLR to the format:
## token_number=token_name

def reformat( infile, outfile )
  lines = []
  File.open infile, "r" do |file|
    file.grep /^([^=]+)=([0-9]+)$/ do |line|
      lines.push [ $1, $2.to_i ] # name, value = $1, $2
    end
  end
  lines = lines.sort_by { |pair| pair[1] }
  File.open outfile, "w" do |file|
    lines.each { |pair| file.puts "#{pair[1]}=#{pair[0]}" }
  end
end

if ARGV.size != 2
  puts "Usage: #{$0} [token file] [output file]"
  exit
end

infile, outfile = ARGV
reformat infile, outfile

^([^=]+)=([0-9]+)$

\2=\1

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• Windows7在微软WinHEC 2008上揭开神秘面纱
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第60行：#define GC_MALLOC_LIMIT 8000000 （默认为200000）
第312行：#define HEAP_MIN_SLOTS 60000  （默认为10000）
第315行：#define FREE_MIN  40960 （默认为4096）

C:\Program Files\Microsoft Visual Studio\VC98\Bin\vcvars32.bat
set INCLUDE=%INCLUDE%;C:\temp\support\include
set LIB=%LIB%;C:\temp\support\lib

cd \temp\ruby-1.8.6-p111
win32\configure.bat i686-mswin32
nmake
nmake rubyw.exe
nmake test

nmake DESTDIR=C:\opt\ruby-1.8.6 install

ruby -v

cd C:\temp\rubygems-0.9.5
ruby setup.rb

gem -v

gem install rails -v 1.1.6
gem install rails -v 1.2.3

• Windows7在微软WinHEC 2008上揭开神秘面纱
• 搜狐网站诚聘Java、PHP和C++工程师

• Windows7在微软WinHEC 2008上揭开神秘面纱
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