macr2tree ツリー変換用の関数

## 呼び出し手順

    p = macr2tree(function)

## 引数

function

  handle of a Scilab macro (not its name as a string)

p

  List of type `program` with the fields `p.name`, `p.nblines`, `p.inputs`, `p.outputs`, and `p.statements`. The 3 last ones are nested lists describing the internal code of the `function`.

## 説明

このプリミティブは, コンパイル済みの Scilab　関数`function-name` を関数を内部表現にコード化したツリー (鱗状のtlists)に変換します. `tree2code()`と共に使用します.

## 例

    prog = macr2tree(log2);   // Note that the input is log2, not "log2"
    typeof(prog)
    fieldnames(prog)'
    prog.name
    deftxt = tree2code(prog, %T);
    printf("%s\n", deftxt);

    --> typeof(prog)
     ans  =
     program

    --> fieldnames(prog)'
     ans  =
    !name  outputs  inputs  statements  nblines  !

    --> prog.name
     ans  =
     log2

    --> deftxt = tree2code(prog, %T);

    --> printf("%s\n", deftxt);
    function [f,e] = log2(x)
      [lhs,rhs] = argn(0)
      if rhs&lt;>1 then
        msg = gettext("%s: Wrong number of input argument(s): %d expected.\n")
        error(msprintf(msg, "log2", 1))
      end
      if argn(1)==1 then
        f = log(x)/log(2)
      else
        [f,e] = frexp(x)
      end
    endfunction

## 参照

- tree2code
- macrovar
- functions