Re: curlyBrackets & squareBrackets
"sunwinson" <[email protected]> Sun, 18 Nov 2012 16:15:03 -0000
| Newsgroups | gmane.comp.lang.io |
|---|---|
| Message-ID | <[email protected]> |
--gemT7drEIreZK98Mbx1ITzh6eWbw7yZGRUpzYtL Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi, Jeremy, Thanks for your detailed explaination! I understand how user should use "brackets" according to "Io language" samp= le code. What I am not sure is, I collected both Lobby/Block/Object slotNames, and f= ind none "Brackets" slots defined, so that we can "override" these slots. Regards, Winson --- In [email protected], Jeremy Tregunna <jeremy.tregunna@...> wr= ote: > > Alright, so "curlyBrackets", "squareBrackets" and "" are all treated spec= ially. They correspond to {}, [] and (). >=20 > They are processed specially because they capture infix expressions. That= is to say, the expression itself is stuck between two known tokens. >=20 > I'll provide an implementation of list() using all three (tl;dr, it's the= same code for all three methods) >=20 > curlyBrackets :=3D method(call evalArgs) > squareBrackets :=3D method(call evalArgs) > setSlot("", method(call evalArgs)) >=20 > Now we can do: {1, 2, 3} or [1, 2, 3] or (1, 2, 3) /* so long as the latt= er is preceded by a space */ >=20 > and things just magically work as you'd expect. That method is called, an= d since "call evalArgs" iterates over the messages supplied as arguments, e= valuating them in the sending context. >=20 > The "curlyBrackets" and "squareBrackets" methods are not defined by defau= lt, 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: >=20 > setSlot("", method(call evalArgAt(0))) >=20 > I hope this clears up how this works.=20=20 >=20 > Regards, >=20 > Jeremy Tregunna >=20 >=20 > On Monday, 12 November, 2012 at 8:10 AM, sunwinson wrote: >=20 > >=20=20=20=20 > > I was confused about how "curlyBrackets" or "squareBrackets" are over r= ided by runtime. > >=20=20 > > [Example] > > I saw some wonderful example about redefining curlyBrackets or squareBr= ackets, 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 r= eturns "curlyBrackets" as the name of IDENTIFIER token and finally become t= he name of IoObject/IoObjectData. The weird thing is, it seems no one is us= ing IoObject name or IDENTIFIER in parser. May I miss anything in source co= de? > >=20=20 > > [My Guess] > > 1. "curlyBrackets" should be some one's secret slot name, but I didn't = find in reference nor Object/Lobby. > > 2. "curlyBrackets" is specially proceed in parser, to check "if anyone = implement that name, then use the specified method object". > >=20=20 > > Could anyone can help me to understand how this "curlyBrackets" works f= rom complier perspective? Thanks a lot! > >=20=20 > > > --gemT7drEIreZK98Mbx1ITzh6eWbw7yZGRUpzYtL Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> </head> <body style="background-color: #fff;"> <span style="display:none"> </span> <!--~-|**|PrettyHtmlStartT|**|-~--> <div id="ygrp-mlmsg" style="position:relative;"> <div id="ygrp-msg" style="z-index: 1;"> <!--~-|**|PrettyHtmlEndT|**|-~--> <div id="ygrp-text" > <p>Hi, Jeremy,<br> <br> Thanks for your detailed explaination!<br> <br> I understand how user should use "brackets" according to "Io language" sample code.<br> <br> What I am not sure is, I collected both Lobby/Block/Object slotNames, and find none "Brackets" slots defined, so that we can "override" these slots.<br> <br> Regards,<br> <br> Winson<br> <br> --- In <a href="mailto:iolanguage%40yahoogroups.com">[email protected]</a>, Jeremy Tregunna <jeremy.tregunna@...> wrote:<br> ><br> > Alright, so "curlyBrackets", "squareBrackets" and "" are all treated specially. They correspond to {}, [] and ().<br> > <br> > They are processed specially because they capture infix expressions. That is to say, the expression itself is stuck between two known tokens.<br> > <br> > I'll provide an implementation of list() using all three (tl;dr, it's the same code for all three methods)<br> > <br> > curlyBrackets := method(call evalArgs)<br> > squareBrackets := method(call evalArgs)<br> > setSlot("", method(call evalArgs))<br> > <br> > 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 */<br> > <br> > 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.<br> > <br> > 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:<br> > <br> > setSlot("", method(call evalArgAt(0)))<br> > <br> > I hope this clears up how this works. <br> > <br> > Regards,<br> > <br> > Jeremy Tregunna<br> > <br> > <br> > On Monday, 12 November, 2012 at 8:10 AM, sunwinson wrote:<br> > <br> > > <br> > > 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> > ><br> ><br> <br> </p> </div> <!--~-|**|PrettyHtmlStart|**|-~--> <div style="color: #fff; height: 0;">__._,_.___</div> <table cellspacing=4px style="margin-top: 20px; margin-bottom: 10px;"> <tbody> <tr> <td style="font-size: 12px; font-family: arial; font-weight: bold; padding: 7px 5px 5px; color: #FFF; background-color: #F2F2F2; border: 1px solid #EAEAEA " > <a style="text-decoration: none; color: #2D50FD" href="http://groups.yahoo.com/group/iolanguage/post;_ylc=X3oDMTJxNzhtMmlvBF9TAzk3MzU5NzE0BGdycElkAzY2Nzc0NzYEZ3Jwc3BJZAMxNzA1MDA2NzY0BG1zZ0lkAzEzMjg2BHNlYwNmdHIEc2xrA3JwbHkEc3RpbWUDMTM1MzI1NTMwNQ--?act=reply&messageNum=13286">Reply via web post</a> </td> <td style="font-size: 12px; font-family: arial; padding: 7px 5px 5px; color: #FFF; background-color: #F2F2F2; border: 1px solid #EAEAEA; " > <a href="mailto:[email protected]?subject=Re%3A%20%5BIo%5D%20curlyBrackets%20%26%20squareBrackets" style="text-decoration: none; color: #2D50FD;"> Reply to sender </a> </td> <td style="font-size: 12px; font-family: arial; padding: 7px 5px 5px; color: #FFF; background-color: #F2F2F2; border: 1px solid #EAEAEA; "> <a href="mailto:[email protected]?subject=Re%3A%20%5BIo%5D%20curlyBrackets%20%26%20squareBrackets" style="text-decoration: none; color: #2D50FD"> Reply to group </a> </td> <td style="font-size: 12px; font-family: arial; padding: 7px 5px 5px; color: #FFF; background-color: #F2F2F2; border: 1px solid #EAEAEA; " > <a href="http://groups.yahoo.com/group/iolanguage/post;_ylc=X3oDMTJlNzJtdG9yBF9TAzk3MzU5NzE0BGdycElkAzY2Nzc0NzYEZ3Jwc3BJZAMxNzA1MDA2NzY0BHNlYwNmdHIEc2xrA250cGMEc3RpbWUDMTM1MzI1NTMwNQ--" style="text-decoration: none; color: #2D50FD">Start a New Topic</a> </td> <td style="font-size: 12px; font-family: arial; padding: 7px 5px 5px; color: #2D50FD; background-color: #F2F2F2; border: 1px solid #EAEAEA; " > <a href="http://groups.yahoo.com/group/iolanguage/message/13282;_ylc=X3oDMTM2dG9mZzNjBF9TAzk3MzU5NzE0BGdycElkAzY2Nzc0NzYEZ3Jwc3BJZAMxNzA1MDA2NzY0BG1zZ0lkAzEzMjg2BHNlYwNmdHIEc2xrA3Z0cGMEc3RpbWUDMTM1MzI1NTMwNQR0cGNJZAMxMzI4Mg--" style="text-decoration: none; color: #2D50FD;">Messages in this topic</a> (4) </td> </tr> </tbody> </table> <!------- Start Nav Bar ------> <!-- |**|begin egp html banner|**| --> <!-- |**|end egp html banner|**| --> <!-- |**|begin egp html banner|**| --> <div id="ygrp-vital" style="background-color: #f2f2f2; font-family: Verdana; font-size: 10px; margin-bottom: 10px; padding: 10px;"> <span id="vithd" style="font-weight: bold; color: #333; text-transform: uppercase; ">Recent Activity:</span> <ul style="list-style-type: none; margin: 0; padding: 0; display: inline;"> <li style="border-right: 1px solid #000; font-weight: 700; display: inline; padding: 0 5px; margin-left: 0;"> <span class="cat"><a href="http://groups.yahoo.com/group/iolanguage/members;_ylc=X3oDMTJmZzlkY3Z1BF9TAzk3MzU5NzE0BGdycElkAzY2Nzc0NzYEZ3Jwc3BJZAMxNzA1MDA2NzY0BHNlYwN2dGwEc2xrA3ZtYnJzBHN0aW1lAzEzNTMyNTUzMDU-?o=6" style="text-decoration: none;">New Members</a></span> <span class="ct" style="color: #ff7900;">2</span> </li> </ul> <div style="clear: both; padding-top: 2px; color: #1e66ae;"> <a href="http://groups.yahoo.com/group/iolanguage;_ylc=X3oDMTJlbXVraG04BF9TAzk3MzU5NzE0BGdycElkAzY2Nzc0NzYEZ3Jwc3BJZAMxNzA1MDA2NzY0BHNlYwN2dGwEc2xrA3ZnaHAEc3RpbWUDMTM1MzI1NTMwNQ--" style="text-decoration: none;">Visit Your Group</a> </div> </div> <div id="ft" style="font-family: Arial; font-size: 11px; margin-top: 5px; padding: 0 2px 0 0; clear: both;"> <a href="http://groups.yahoo.com/;_ylc=X3oDMTJkOHJkY2l0BF9TAzk3MzU5NzE0BGdycElkAzY2Nzc0NzYEZ3Jwc3BJZAMxNzA1MDA2NzY0BHNlYwNmdHIEc2xrA2dmcARzdGltZQMxMzUzMjU1MzA1" style="float: left;"><img src="http://l.yimg.com/a/i/us/yg/logo/us.gif" height="15" width="137" alt="Yahoo! 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