netbeans 如何查看ruby源代码？

Question

请问一下，如何才能在netbeans利用ctrl+鼠标左键，查看ruby源码，比如：

ss = Array.new

然后我想查看具体ruby内置的array是如何实现的，要怎么查看啊？或者说要在netbeans如何设置？，我目前看不到源码，只能看到注释。


希望大家知道的告诉一下，谢谢~~~~

Answer 1

由于Array是比较核心的类，为了速度考虑，源代码是用C写的，netbeans是看不到C的源代码的（已经编译了）。

你可以看Ruby doc
[url]http://www.ruby-doc.org/core/[/url]

RDoc的方法，[b]点击方法名字[/b]就能看到包含源代码的弹出窗口。

下面这段是Array.new的实现。
在C中，ruby的值类型是VALUE，VALUE是一个无符号整数，可以认为它是对象的ID。
btw，符号ID由rb_intern(VALUE v)得到。
[code="c"]
/*

• call-seq:
• Array.new(size=0, obj=nil)
• Array.new(array)
• Array.new(size) {|index| block } *
• Returns a new array. In the first form, the new array is
• empty. In the second it is created with size copies of obj
• (that is, size references to the same
• obj). The third form creates a copy of the array
• passed as a parameter (the array is generated by calling
• to_ary on the parameter). In the last form, an array
• of the given size is created. Each element in this array is
• calculated by passing the element's index to the given block and
• storing the return value. *
• Array.new
• Array.new(2)
• Array.new(5, "A")
• # only one copy of the object is created
• a = Array.new(2, Hash.new)
• a[0]['cat'] = 'feline'
• a
• a[1]['cat'] = 'Felix'
• a
• # here multiple copies are created
• a = Array.new(2) { Hash.new }
• a[0]['cat'] = 'feline'
• a
• squares = Array.new(5) {|i| i*i}
• squares
• copy = Array.new(squares) */

static VALUE
rb_ary_initialize(argc, argv, ary)
int argc;
VALUE *argv;
VALUE ary;
{
long len;
VALUE size, val;

rb_ary_modify(ary);
if (rb_scan_args(argc, argv, "02", &size, &val) == 0) {
    RARRAY(ary)->len = 0;
    if (rb_block_given_p()) {
        rb_warning("given block not used");
    }
    return ary;
}

if (argc == 1 && !FIXNUM_P(size)) {
    val = rb_check_array_type(size);
    if (!NIL_P(val)) {
        rb_ary_replace(ary, val);
        return ary;
    }
}

len = NUM2LONG(size);
if (len < 0) {
    rb_raise(rb_eArgError, "negative array size");
}
if (len > 0 && len * (long)sizeof(VALUE) <= len) {
    rb_raise(rb_eArgError, "array size too big");
}
if (len > RARRAY(ary)->aux.capa) {
    REALLOC_N(RARRAY(ary)->ptr, VALUE, len);
    RARRAY(ary)->aux.capa = len;
}
if (rb_block_given_p()) {
    long i;

    if (argc == 2) {
        rb_warn("block supersedes default value argument");
    }
    for (i=0; i<len; i++) {
        rb_ary_store(ary, i, rb_yield(LONG2NUM(i)));
        RARRAY(ary)->len = i + 1;
    }
}
else {
    memfill(RARRAY(ary)->ptr, len, val);
    RARRAY(ary)->len = len;
}

return ary;

}
[/code]

查看ruby实现的源代码，一种方法是[b]navigate[/b]（查看工程中所有对象列表），另一种方法是[b]CTRL+B[/b]跳到声明处。