Re: multi-line Strings

BGB <>
Wed, 19 Dec 2012 08:26:00 -0600
On 12/18/2012 8:07 PM, Arne Vajh?j wrote:

On 12/15/2012 6:54 AM, Chris Uppal wrote:

Off-the-top-of-my-head (all classes and method are imaginary):

     Regexp alpha = Regexp.fromList(java.lang.text.portable.Alphas);
     alpha = alpha.or('_');
     Regexp num = Regexp.fromList(java.lang.text.portable.Digits);
     Regexp alphanum = alpha.or(num);
     Regexp identifier = alpha.followedBy(alphanum.repeated());

I think that is what is widely known in the .NET world
as a fluent API.

better term maybe than "big pile o' nasty...".

yes, regex syntax could be nicer, but probably not by making it into a
big pile of API calls.

maybe something more EBNF-like can be used, like say:
SyntaxPattern pat = new SyntaxPattern(
    "alpha = ('A'-'Z') | ('a'-'z');"
    "alpha2 = alpha | '_';",
    "hexalpha = ('A'-'F') | ('a'-'f');"
    "num = ('0'-'9');",
    "hexnum = num | hexalpha;",
    "alphanum = alpha2 | num;",
    "basenumber = num+;",
    "realnumber = basenumber '.' basenumber ['e' basenumber ];",
    "hexnumber = '0x' hexnum+;",
    "integer = basenumber | hexnumber;",
    "identifier = alpha2 alphanum*;",

StringReader strr = new StringReader("foo 999 bar69");
String tok;
if(pat.match(strr, "identifier"))
    tok=pat.readNext(strr, "identifier");

tok=pat.tryMatchRead(strr, "identifier");

SyntaxParser parse = new SyntaxParser(strr, pat);

granted, yes, all this is probably something a bit different than using
regexes, but oh well.

or something...

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