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|
include 'colm.lm'
export ColmTree: start
export ColmError: str
A: str = argv->pop()
F: stream = open( A, 'r' )
parse P: start [ F ]
alias prod_map map<prod_list, id>
alias unique_prod map_el<prod_list, id>
global PM: prod_map = new prod_map()
global NextId: int = 1
global Modified: bool = false
prod_list cons_prod( SLA: prod_sublist )
{
if match SLA [Left: prod_sublist BAR prod_el_list]
return cons prod_list[ cons_prod(Left) ' | [ ' SLA.prod_el_list ' ] ' ]
else
return cons prod_list[ '[ ' SLA.prod_el_list ' ]' ]
}
cfl_def rewrite_cfl_def( CflDef: ref<cfl_def> )
{
NewDef: cfl_def
for PE: prod_el in CflDef {
if match PE [
OptName: opt_prod_el_name POPEN PS: prod_sublist PCLOSE OptRep: opt_repeat]
{
PL: prod_list = cons_prod(PS)
Name: id = PM->find( PL )
if ( !Name ) {
Name = parse id
"_sublist_[sprintf("%d", NextId)]"
NextId = NextId + 1
PM->insert( PL, Name )
NewDef = cons cfl_def
"def [Name] [PL]"
}
PE = cons prod_el
[OptName Name OptRep " "]
Modified = true
# Currently can return only one item.
if ( NewDef )
break
}
}
return NewDef
}
void rewrite( P: ref<start> )
{
Modified = false
for RIL: root_item<* in P {
require RIL [Head: root_item<* CflDef: cfl_def]
NewDef: cfl_def
NewDef = rewrite_cfl_def( CflDef )
if NewDef {
RIL = cons root_item<* [Head NewDef "\n\n" CflDef]
Modified = true
}
else {
RIL = cons root_item<* [Head CflDef]
}
}
return Modified
}
if P {
while ( rewrite( P ) ) {}
}
ColmTree = P
ColmError = error
|
