Wolfram Language Paclet Repository
Community-contributed installable additions to the Wolfram Language
Wolfram`Parser`Languages`Calculator`
CalculatorGrammar  |
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CalculatorGrammar
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The semantic actions never construct nodes directly. They call into alg by key - , , - so swapping the algebra reroutes every action at once.
alg["Leaf"][kind,src]
alg["Binary"][op,l,r]
alg["Prefix"][op,x]
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The grammar covers , unary minus, parentheses, integer and real literals, and bare identifiers. Precedence is set by , the library's Pratt / precedence-climbing combinator: tightest first, parentheses, unary minus, (right associative), , .
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The result is a built . Run it on input either as or equivalently with .
pc[input]
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and are thin wrappers: runs (wrapping the result in a ), and runs .
CalculatorAST
CalculatorGrammar[ASTAlgebra]
CalculatorEval
CalculatorGrammar[CalculatorSemantic]
Examples
(4)
Basic Examples
(1)
In[1]:=
Head
 | CalculatorGrammar |
| CalculatorSemantic |
Out[1]=
ParserCombinator
In[2]:=
| CalculatorGrammar |
| CalculatorSemantic |
Out[2]=
7
In[3]:=
| CalculatorGrammar |
| ASTAlgebra |
Out[3]=
BinaryNode[+,{LeafNode[Integer,1,Source{1,2}],LeafNode[Integer,2,Source{3,4}]},]
Scope
(1)
Properties & Relations
(1)
Possible Issues
(1)
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