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table_dyn.jl
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table_dyn.jl
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## Table with dynamic scope for iteration variable.
## using a[2] for iteration variable still does not work.
##
## We need to reimplement tricks like writing the value
## of the iteration variable into a copy of the expression (or restoring it).
## In this case, we still have to localize the variable with dynamic scope so
## it has the expected (possible) side-effects.
##
## Also, this is copied from older code. There are probably no inefficiencies introduced.
## But, it is more complicated than it needs to be
abstract type TableEval end
struct TableSetEval{T,V} <: TableEval
expr::T
sym::V
end
struct TableNoSetEval{T} <: TableEval
expr::T
end
@mkapprule Table
@sjdoc Table """
Table(expr,[imax])
return a `List` of `imax` copies of `expr`.
Table(expr,[i,imax])
returns a `List` of `expr` evaluated `imax` times with `i` set successively to `1` through `imax`.
Table(expr,iter)
`iter` can be any standard iterator.
Table(expr,iter1,iter2,...)
is equivalent to `Table(Table(expr,iter2),iter1)...`
This example calls an anonymous Julia function
```
f = :( g(x) = x^2 )
Table( f(i), [i,10])
```
"""
set_attribute(:Table, :HoldAll)
@doap Table(x) = mx
@doap function Table(inexpr, iters...)
if length(iters) > 1
riters = reverse(iters)
mxout = mxpr(:Table,inexpr,riters[1])
for i in 2:length(riters)
mxout = mxpr(:Table,mxout,riters[i])
end
return mxout
end
expr = is_Mxpr(inexpr,:Jxpr) ? eval(inexpr) : inexpr
it = iters[1]
sjiter = make_sjiter(it)
dosaveval::Bool = true
if typeof(sjiter) <: SJIter1
dosaveval = false
end
local saveval
if dosaveval
saveval = symval(it[1])
end
local t = NullMxpr
try # at the moment it doesn't matter much because we can't interrupt anyway..., could be errors though
t = table(expr, sjiter)
catch
symerror("error in Table") # or interrupt
finally
if dosaveval
setsymval(it[1], saveval)
end
end
t
end
function table(expr, sjiter)
mxpr(:List, intable(expr, sjiter))
end
function intable(expr, iter::SJIter1)
tableloop1(expr, iter.imax)
end
function intable(expr, iter::SJIter2)
(sym, nexpr) = (iter.i,expr)
tableloop2(sym, nexpr, iter.imax)
end
function intable(expr, iter::SJIterList)
(sym, nexpr) = (iter.i,expr)
tableloop_list(sym, nexpr, iter.list)
end
function evaltable(model::TableSetEval, val)
setandeval(model.expr, model.sym, val)
end
function evaltable(model::TableNoSetEval)
nosetandeval(model.expr)
end
function setandeval(expr,sym,val)
setsymval(sym,val)
unsetfixed(expr)
r = doeval(expr)
setfixed(r) # trying to gain a little efficiency
setcanon(r) # usually fails in some more or less edge case
r
end
function nosetandeval(expr)
unsetfixed(expr)
r = doeval(expr)
setfixed(r) # trying to gain a little efficiency
setcanon(r) # usually fails in some more or less edge case
r
end
function intable(expr0,iter::SJIter3{T,V}) where {T<:Real,V<:Real}
(sym, expr) = (iter.i,expr0)
imax = doeval(iter.imax) # maybe this should be done earlier. When iter is created ?
imin = doeval(iter.imin)
args = newargs(imax-imin+1)
if iter.i == expr
@inbounds for i in imin:imax
args[i-imin+1] = i
end
else
model = TableSetEval(expr,sym)
_table3(model,imin,imax,args)
end
return args
end
function _table3(model,imin,imax,args)
for i in imin:imax
args[i-imin+1] = evaltable(model,i)
end
end
function intable(expr0, iter::SJIter4{T,V,W}) where {T<:Real, V<:Real, W<:Real}
(sym, expr) = (iter.i,expr0)
imax = iter.imax # why do we not evaluate here
imin = iter.imin
di = iter.di
args = newargs(iter.num_iters)
j::Int = 0
if iter.i == expr
@inbounds for i in imin:di:imax
j += 1
args[j] = i
end
else
model = TableSetEval(expr,sym)
@inbounds for i in imin:di:imax
j += 1
args[j] = evaltable(model,i)
end
end
return args
end
# Symbolic value and increment
function intable(expr0, iter::SJIter4{T,V,W}) where {T, V, W}
(sym, expr) = (iter.i,expr0)
imax = iter.imax
imin = iter.imin
di = iter.di
num_iters = iter.num_iters
args = newargs(iter.num_iters)
model = TableSetEval(expr,sym)
val = deepcopy(imin)
@inbounds for i in 1:num_iters
args[i] = evaltable(model,val)
val = doeval(mxpr(:Plus, val, di))
end
args
end
function tableloop1(expr, imax)
args = newargs(imax)
model = TableNoSetEval(expr)
@inbounds for i=1:imax
args[i] = evaltable(model)
end
args
end
function tableloop2(sym, expr, imax)
args = newargs(imax)
model = TableSetEval(expr,sym)
@inbounds for i=1:imax
args[i] = evaltable(model,i)
end
args
end
function table3(expr,iter::SJIter3{T,V}) where {T<:Real,V<:Real}
imax = doeval(iter.imax) # maybe this should be done earlier. When iter is created ?
imin = doeval(iter.imin)
args = newargs(imax-imin+1)
if iter.i == expr
@inbounds for i in imin:imax
args[i-imin+1] = i
end
else
model = TableSetEval(expr,sym)
@inbounds for i in imin:imax
args[i-imin+1] = evaltable(model,i)
end
end
return args
end
function tableloop_list(sym, expr, list)
len = length(list)
args = newargs(len)
model = TableSetEval(expr,sym)
for i in 1:len
args[i] = evaltable(model,list[i])
end
args
end