ruby-dev

わたなべです.

"EGUCHI Osamu" <eguchi@shizuokanet.or.jp> writes:

:以前にも議論があったようですが、
:
:a = <<EOF
:abcdef .. xyz.
:EOF
:
:の様な使い方は、現在は出来ないようですね。

ちゃんと動いてると思うんですが…

:a << "ABC"
:が左シフトか Here document の開始かはまったく曖昧で
:現在は左シフトの様です。

それは a が数値か配列か文字列かで違うし, here document の場
合だと a <<"ABC" のように間を空けないってルールになってます,
いまのところ(たぶん).
昔の perl も結構悩ましかったけど.

:現状の `<<' を左シフトと共用していると、いかに ruby の
:パーサがレキシカルアナライザと連携しているといっても
:投機的解析でもしなければ、曖昧さの除去は無理だと思うです。

<< は lshift だけじゃなくて, もっといろいろあったりするけど,

STDOUT << <<"<<" << (1 << 2) << "\n"
1 << 2 =
<<

こんなのもちゃんと動いてるし, いいんじゃないかな?

-- 
わたなべひろふみ

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