# Semantics stack manipulation routines to be called by
# parseLL1(...), the parser for the TLCLL1 LL(1) parser
# generator.
#	(written by Dr. Thomas W. Christopher)
#

global semanticsStack

record ErrorToken(type,body,line,column)

procedure initSemanticsStack()
 semanticsStack:=[]
return
end


procedure outToken(tok)
 push(semanticsStack,tok)
return
end

procedure outAction(a)
a()
return
end

procedure outError(t,l,c)
push(semanticsStack,ErrorToken(t,t,\l|0,\c|0))
return
end

procedure isError(v)
 return type(v)=="ErrorToken"
end

procedure popSem(n)
local V
V:=[]
every 1 to n do push(V,pop(semanticsStack))
return V
end

procedure pushSem(s)
push(semanticsStack,s)
return
end

procedure anyError(V)
local v
if v:=!V & type(v)=="ErrorToken" then {
	return v
}
fail
end