Wolfram Language Paclet Repository
Community-contributed installable additions to the Wolfram Language
Wolfram`Parser`
ParseTry  |
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On success returns p's result unchanged; on failure it reports p's failure with the position reset to where started.
ParseTry[p]
ParseTry
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ParseTry
ParseTry
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In this parser already restarts every alternative from the position where the choice began, so it recovers from partial consumption on its own. Wrapping an alternative in therefore does not change the result.
ParseTry
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The combinator is preserved through , so a grammar's shape stays identical to one written for a backtracking-by-default combinator library.
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ParseTry
Examples
(8)
Basic Examples
(4)
The combinator wraps its argument:
In[1]:=
 | ParseTry |
 | ParseLiteral |
Out[1]=
ParserCombinator
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On success is transparent - it returns its parser's result unchanged:
ParseTry
In[1]:=
| Parse |
 | ParseTry |
 | ParseLiteral |
Out[1]=
foo
In[1]:=
| Parse |
| ParseTry |
 | ParseLiteral |
| ParseLiteral |
Out[1]=
{a,b}
On failure it reports the wrapped parser's own diagnostic:
In[1]:=
| Parse |
| ParseTry |
| ParseLiteral |
Out[1]=
Failure
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Scope
(1)
Properties & Relations
(2)
Possible Issues
(1)
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""