Re: curlyBrackets & squareBrackets
Jeremy Tregunna <[email protected]> Tue, 13 Nov 2012 14:41:30 -0600
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Alright, so "curlyBrackets", "squareBrackets" and "" are all treated specia=
lly. They correspond to {}, [] and ().
They are processed specially because they capture infix expressions. That i=
s to say, the expression itself is stuck between two known tokens.
I'll provide an implementation of list() using all three (tl;dr, it's the s=
ame code for all three methods)
curlyBrackets :=3D method(call evalArgs)
squareBrackets :=3D method(call evalArgs)
setSlot("", method(call evalArgs))
Now we can do: {1, 2, 3} or [1, 2, 3] or (1, 2, 3) /* so long as the latter=
is preceded by a space */
and things just magically work as you'd expect. That method is called, and =
since "call evalArgs" iterates over the messages supplied as arguments, eva=
luating them in the sending context.
The "curlyBrackets" and "squareBrackets" methods are not defined by default=
, they are permitted for user code, but the core language doesn't define th=
em. "" on the other hand, is defined by the system, and it's just defined a=
s:
setSlot("", method(call evalArgAt(0)))
I hope this clears up how this works.=20=20
Regards,
Jeremy Tregunna
On Monday, 12 November, 2012 at 8:10 AM, sunwinson wrote:
>=20=20=20=20
> I was confused about how "curlyBrackets" or "squareBrackets" are over rid=
ed by runtime.
>=20=20
> [Example]
> I saw some wonderful example about redefining curlyBrackets or squareBrac=
kets, to create graceful DSL to handle the next txt file:
> {
> "Blair, Black": 10,
> "John, Kelly": 11
> }
>=20=20
> Redefining "curlyBrackets" can operate the item one by by as a map.
>=20=20
> [My Research]
> I searched:
> 1. all slotNames of "Object" for "curlyBrackets", none was found.
> 2. source code of Io language, only find one instance in Lexer, which ret=
urns "curlyBrackets" as the name of IDENTIFIER token and finally become the=
name of IoObject/IoObjectData. The weird thing is, it seems no one is usin=
g IoObject name or IDENTIFIER in parser. May I miss anything in source code=
?
>=20=20
> [My Guess]
> 1. "curlyBrackets" should be some one's secret slot name, but I didn't fi=
nd in reference nor Object/Lobby.
> 2. "curlyBrackets" is specially proceed in parser, to check "if anyone im=
plement that name, then use the specified method object".
>=20=20
> Could anyone can help me to understand how this "curlyBrackets" works fro=
m complier perspective? Thanks a lot!
>=20=20
>=20=20=20
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Alright, so "curlyBrackets", "squareBrackets" and "" are all treated specially. They correspond to {}, [] and ().<div><br></div><div>They are processed specially because they capture infix expressions. That is to say, the expression itself is stuck between two known tokens.</div><div><br></div><div>I'll provide an implementation of list() using all three (tl;dr, it's the same code for all three methods)</div><div><br></div><div>curlyBrackets := method(call evalArgs)</div><div>squareBrackets := method(call evalArgs)</div><div>setSlot("", method(call evalArgs))</div><div><br></div><div>Now we can do: {1, 2, 3} or [1, 2, 3] or (1, 2, 3) /* so long as the latter is preceded by a space */</div><div><br></div><div>and things just magically work as you'd expect. That method is
called, and since "call evalArgs" iterates over the messages supplied as arguments, evaluating them in the sending context.</div><div><br></div><div>The "curlyBrackets" and "squareBrackets" methods are not defined by default, they are permitted for user code, but the core language doesn't define them. "" on the other hand, is defined by the system, and it's just defined as:</div><div><br></div><div>setSlot("", method(call evalArgAt(0)))</div><div><br></div><div>I hope this clears up how this works.</div>
</div>
<div><div><br></div><div>Regards,</div><div><br></div><div>Jeremy Tregunna</div><div><br></div></div>
<p style="color: #A0A0A8;">On Monday, 12 November, 2012 at 8:10 AM, sunwinson wrote:</p>
<blockquote type="cite" style="border-left-style:solid;border-width:1px;">
<span><div><div>
<span> </span>
<div>
<p>I was confused about how "curlyBrackets" or "squareBrackets" are over rided by runtime.<br>
<br>
[Example]<br>
I saw some wonderful example about redefining curlyBrackets or squareBrackets, to create graceful DSL to handle the next txt file:<br>
{<br>
"Blair, Black": 10,<br>
"John, Kelly": 11<br>
}<br>
<br>
Redefining "curlyBrackets" can operate the item one by by as a map.<br>
<br>
[My Research]<br>
I searched:<br>
1. all slotNames of "Object" for "curlyBrackets", none was found.<br>
2. source code of Io language, only find one instance in Lexer, which returns "curlyBrackets" as the name of IDENTIFIER token and finally become the name of IoObject/IoObjectData. The weird thing is, it seems no one is using IoObject name or IDENTIFIER in parser. May I miss anything in source code?<br>
<br>
[My Guess]<br>
1. "curlyBrackets" should be some one's secret slot name, but I didn't find in reference nor Object/Lobby.<br>
2. "curlyBrackets" is specially proceed in parser, to check "if anyone implement that name, then use the specified method object".<br>
<br>
Could anyone can help me to understand how this "curlyBrackets" works from complier perspective? Thanks a lot!<br>
<br>
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