Wolfram Language Paclet Repository
Community-contributed installable additions to the Wolfram Language
Wolfram`Parser`
LeafNode  |
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▪
LeafNode
CodeParser
sown
`LeafNode
▪
kind is a language-native descriptor string such as , , , , , , or . It labels the terminal without committing to a Wolfram symbol.
"Integer"
"Real"
"String"
"Symbol"
"Boolean"
"Null"
"Command"
"Token"
▪
source is the literal matched text, kept verbatim: the integer one is , not , and a JSON string leaf keeps its surrounding quotes. A value is only interpreted in a language's evaluating mode (for example ).
"1"
1
▪
meta is an association of metadata. When the leaf comes from a real parse it holds a position linecollinecol spanning the matched text; a node you build by hand carries an empty .
"Source"
{{
,
},{
,
}}
▪
Every zoo grammar emits leaves: tags numbers / and identifiers ; adds , and ; tags each of the eight commands ; and use for identifiers.
"Integer"
"Real"
"Symbol"
"String"
"Boolean"
"Null"
"Command"
"Symbol"
Examples
(2)
Basic Examples
(1)
A leaf built literally holds its three slots unevaluated:
In[1]:=
 | LeafNode |
Out[1]=
LeafNode[Integer,1,]
In[2]:=
| CalculatorAST |
Out[2]=
ContainerNode[String,{LeafNode[Integer,42,Source{{1,1},{1,3}}]},Source{{1,1},{1,3}}]
Each Brainfuck command is a leaf:
"Command"
In[3]:=
| BrainfuckAST |
Out[3]=
ContainerNode[String,{LeafNode[Command,+,Source{{1,1},{1,2}}]},Source{{1,1},{1,2}}]
Properties & Relations
(1)
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""