Wolfram Language Paclet Repository
Community-contributed installable additions to the Wolfram Language
Wolfram`Parser`
SetRec  |
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SetRec
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Make parser a of concrete alternatives rather than a production beginning with a nullable parser; re-entering at a nullable prefix can match empty and bail instead of recursing.
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Mutually-recursive productions each get their own cell; bind each with its own , in any order, since the references resolve lazily.
SetRec
Examples
(3)
Basic Examples
(1)
Allocate a cell, write a nested-list production that refers to it through , and close the loop with :
SetRec
In[1]:=
cell=
[];list=
"["],
["[0-9]+"],
[cell],
[","],
["]";
[cell,list];
[list,"[1,[2,3]]"]
 | RecCell |
| ParseBetween |
 | ParseLiteral |
| ParseSepBy |
 | ParseChoice |
| ParseRegex |
| RecRef |
| ParseLiteral |
| ParseLiteral |
 | SetRec |
 | Parse |
Out[1]=
{1,{2,3}}
SetRec
In[2]:=
| SetRec |
| RecCell |
| ParseLiteral |
Out[2]=
ParserCombinator
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Scope
(1)
Possible Issues
(1)
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""