Special syntax
APL has some special syntax that is treated in a special way by APLMON.
For example, cases of Simple Indexing (where the indexer is a set of semicolon-separated simple arrays) are reported as follows.
The token is simple indexing, there are no lfn or rfn, the left argument is the indexed array, and the right argument is as representative of the indices as possible. Dyalog has chosen to make it appear as an array, the rank of which is the number of specified subscripts, and the shape of which is the number of items in these subscripts.
| APL expression | token | lfn | rfn | ltype | rtype | lrank | rrank | lbound | rbound |
|---|---|---|---|---|---|---|---|---|---|
'abcd'[3 3⍴3] |
simple indexing |
unicode8 | int8 | 1 | 1 | 2<4 | 5<9 | ||
(2 2⍴4)[1;] |
simple indexing |
int8 | int8 | 2 | 1 | 2<4 | 1<1 |
Reach and Choose Indexing (where the indexer is a nested array)
The token is reach indexing, the left argument is the indexed array, and the right argument is the indexer array.
Axis specification
The token is axis, lfn is the function whose axis is specified, rfn is non-primitive, as it is the axis specification constant.
Assignment
The token is left arrow and it is considered as a monadic function.
Modified Assignment
The token is left arrow, lfn is the modifier function, rfn is empty, larg is the modified value and rarg the modifier value.
Indexed Assignment
The token is indexed assignment, lfn and rfn are empty, larg is the indexed array, rarg is the new value.
Modified Indexed Assignment
The token is indexed assignment, lfn is the modifier function, rfn is empty, larg is the indexed array, rarg is the new value.
Selective Assignment
The token is selective assignment,lfn and rfn are empty,larg is the indexed array, rarg is the new value.
Modified Selective Assignment
The token is selective assignment, lfn is the modifier function, rfn is empty, larg is the indexed array, rarg is the new value.
Stranding
The token is stranding, larg and rarg are the arrays being stranded together.
Name Lookup
The token is name lookup. This represents time spent in the parser looking up names in namespaces.
Defined Function Initialisation
The token is tradfn init. This represents time spent on entry to a traditional defined function.
Selective Assignment Pre-scan
The token is selassi pre-scan. This represents extra time spent in the parser to analyse the syntax of a selective assignment expression.
Control Structures
The token is control structures. This represents time spent processing control structures in a traditional defined function.
Namespace dot syntax
The token is nsref, lfn and rfn are right and left operands respectively, larg and rarg are as expected.
For example, in the expression: ⎕SE.⎕EX 'var'
token is nsref, lfn is ⎕EX, rfn is non-primitive, larg is empty, rarg is the character vector.