a := a + 1 * c;
c := 6 - a + c + a * 0 + OMEGA;
a := (a) + 1 + c;
[|
[ y : a;
z : c;
y1 : c |];
[|
[ y : c
|
y := 2;
[ xx : y;
z1 : xx |]]]]]
"""
s = grammar.S(parser.pushstream(lex.lex(reader.stringreader(program))))
s.parse()
assert s.atend()
s.visit(grammar.parentset)
s.visit(grammar.tokenset)
s.reform([exp.simplify_depth], [exp.simplify_arith])
s.visit(grammar.parentset)
s.visit(block.blockset)
s.visit(block.declsset)
s.visit(block.namecheck)
print(s.pprint())
def trymatch(node, parent):
ctx = context([node], 0, {})
if te.match(ctx):
print("{}: {} ({})".format(node.printexp(), ctx.out, ctx.pos))
stmt.stmts, block.decls]]):
return [node.children[0]]
elif any([
parser.istoken(node, t)
for t in ["[", "]", "(", ")", ";", "|", ":", ":="]
]):
return []
else:
return [node]
import trex
import reader
identities = [
trex.trex(parser.pushstream(lex.lex(reader.stringreader(s)))) for s in [
'"0" ; "+" ; x:. ;^>add>', # 0 + x == x
'x:. ; "+" ; "0" ;^>add>', # x + 0 == x
'x:. ; "-" ; "0" ;^>add>', # x - 0 == x
'x:"OMEGA" ; "+" ; . ;^>add>', # OMEGA + x == OMEGA
'x:"OMEGA" ; "-" ; . ;^>add>', # OMEGA - x == OMEGA
'. ; "+" ; x:"OMEGA" ;^>add>', # x + OMEGA == OMEGA
'"1" ; "*" ; x:. ;^>mul>', # 1 * x == x
'x:. ; "*" ; "1" ;^>mul>', # x * 1 == x
'x:. ; "/" ; "1" ;^>mul>', # x / 1 == x
'x:"0" ; "*" ; . ;^>mul>', # 0 * x == 0
'x:"0" ; "/" ; . ;^>mul>', # 0 / x == 0
'. ; "*" ; x:"0" ;^>mul>'
]
] # x * 0 == 0
if len(node.children) == 1 and \
any([isinstance(node, ntype) for ntype in [exp, logic, order, add, mul,
unary, atom, stmt.stmt,
stmt.stmts, block.decls]]):
return [node.children[0]]
elif any([parser.istoken(node, t) for t in ["[", "]", "(", ")", ";", "|",
":", ":="]]):
return []
else:
return [node]
import trex
import reader
identities = [trex.trex(parser.pushstream(
lex.lex(reader.stringreader(s)))) for s in
['"0" ; "+" ; x:. ;^>add>', # 0 + x == x
'x:. ; "+" ; "0" ;^>add>', # x + 0 == x
'x:. ; "-" ; "0" ;^>add>', # x - 0 == x
'x:"OMEGA" ; "+" ; . ;^>add>', # OMEGA + x == OMEGA
'x:"OMEGA" ; "-" ; . ;^>add>', # OMEGA - x == OMEGA
'. ; "+" ; x:"OMEGA" ;^>add>', # x + OMEGA == OMEGA
'"1" ; "*" ; x:. ;^>mul>', # 1 * x == x
'x:. ; "*" ; "1" ;^>mul>', # x * 1 == x
'x:. ; "/" ; "1" ;^>mul>', # x / 1 == x
'x:"0" ; "*" ; . ;^>mul>', # 0 * x == 0
'x:"0" ; "/" ; . ;^>mul>', # 0 / x == 0
'. ; "*" ; x:"0" ;^>mul>']] # x * 0 == 0
assert all(i.parse() and i.atend() for i in identities)
a := a + 1 * c;
c := 6 - a + c + a * 0 + OMEGA;
a := (a) + 1 + c;
[|
[ y : a;
z : c;
y1 : c |];
[|
[ y : c
|
y := 2;
[ xx : y;
z1 : xx |]]]]]
"""
s = grammar.S(parser.pushstream(lex.lex(reader.stringreader(program))))
s.parse()
assert s.atend()
s.visit(grammar.parentset)
s.visit(grammar.tokenset)
s.reform([exp.simplify_depth], [exp.simplify_arith])
s.visit(grammar.parentset)
s.visit(block.blockset)
s.visit(block.declsset)
s.visit(block.namecheck)
print(s.pprint())
def trymatch(node, parent):
ctx = context([node], 0, {})
if te.match(ctx):
print("{}: {} ({})".format(node.printexp(), ctx.out, ctx.pos))