Wolfram Language Paclet Repository
Community-contributed installable additions to the Wolfram Language
Wolfram`Parser`
ParseChainRight  |
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op returns its combining function. op matches an operator token and yields a binary function, applied as — the same op-returns-a-function convention as . Attach it with : .
f[left,right]
ParseAction[ParseLiteral["^"],(Power&)]
▪
Right-associative fold. Operands nest to the right: becomes . For this makes evaluate as .
poppopp
f[p1,f[p2,f[p3,p4]]]
2^3^2
2^(3^2)
▪
One or more operands. At least one p is required, so empty input fails. A lone operand with no following operator returns that operand itself, not a one-element list.
▪
One precedence level. handles a single operator precedence. For several levels, or for prefix / postfix operators, use — its one--operator table is exactly this combinator, in one linear pass.
ParseChainRight
"InfixR"
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Result type: whatever op's function returns, not necessarily a list.
Examples
(13)
Basic Examples
(3)
Right-associative exponentiation — the chain folds as , i.e. :
2^3^2
2^(3^2)
2^9
In[1]:=
num=
[DigitCharacter],FromDigits;pow=
["^"],(Power&);
[num,pow],"2^3^2"
 | ParseAction |
 | ParseCharacter |
| ParseAction |
| ParseLiteral |
 | Parse |
| ParseChainRight |
Out[1]=
512
Right-associative subtraction groups the other way from the everyday reading — becomes :
1-2-3
1-(2-3)
In[1]:=
sub=
["-"],(Subtract&);
[num,sub],"1-2-3"
| ParseAction |
| ParseLiteral |
| Parse |
| ParseChainRight |
Out[1]=
2
A single operand, with no operator, returns the operand itself:
In[1]:=
| Parse |
| ParseChainRight |
Out[1]=
5
Scope
(3)
Properties & Relations
(2)
Possible Issues
(4)
Neat Examples
(1)
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