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test_recursive.py
474 lines (417 loc) · 10.6 KB
/
test_recursive.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#Author: Tim Henderson
#Email: tim.tadh@hackthology.com
#For licensing see the LICENSE file in the top level directory.
import itertools
from nose.tools import eq_ as eq, ok_ as ok, raises
from betterast import Node
import lexer
from recursive import parse
from lexer import token
def new_parser():
return object.__new__(parse)
def test_mk_test_instance():
parser = new_parser()
assert isinstance(parser, parse)
def test_init():
parser = new_parser()
parser.init("2 + 3 / 4")
assert isinstance(parser.tokens, list)
expected = [
token(lexer.NUMBER, 2),
token(lexer.PLUS, '+'),
token(lexer.NUMBER, 3),
token(lexer.SLASH, '/'),
token(lexer.NUMBER, 4),
]
eq(len(parser.tokens), len(expected))
for a, b in itertools.izip(parser.tokens, expected):
eq(a, b)
def test_Factor_parse_number():
parser = new_parser()
parser.init("2")
i, node = parser.Factor(0)
eq(i, 1)
eq(node.label, 2)
def test_consume_pos():
parser = new_parser()
parser.init("(2 + 3) / 4")
i, tok = parser.consume(0, lexer.LPAREN)
eq(i, 1)
eq(tok.type, lexer.LPAREN)
@raises(SyntaxError)
def test_consume_neg():
parser = new_parser()
parser.init("(2 + 3) / 4")
parser.consume(0, lexer.NUMBER)
def test_alt_pos():
parser = new_parser()
parser.init("(2 + 3) / 4")
def one(i):
return parser.consume(i, lexer.NUMBER)
def two(i):
return parser.consume(i, lexer.LPAREN)
i, tok = parser.alt(0, [lexer.NUMBER, lexer.LPAREN], one, two)
eq(i, 1)
eq(tok.type, lexer.LPAREN)
@raises(SyntaxError)
def test_alt_neg():
parser = new_parser()
parser.init("(2 + 3) / 4")
def one(i):
return parser.consume(i, lexer.NUMBER)
def two(i):
return parser.consume(i, lexer.PLUS)
parser.alt(0, [lexer.NUMBER, lexer.LPAREN], one, two)
def test_Factor1():
parser = new_parser()
parser.init("(2 + 3) / 4")
i, node = parser.Factor1(1)
eq(i, 2)
eq(node.label, 2)
eq(len(node.children), 0)
def test_Factor2():
parser = new_parser()
parser.init("(2)")
i, node = parser.Factor2(0)
eq(i, 3)
eq(node.label, 2)
eq(len(node.children), 0)
def test_Unary1():
parser = new_parser()
parser.init("-2")
i, node = parser.Unary1(0)
eq(i, 2)
eq(node.label, "Neg")
eq(len(node.children), 1)
eq(node.children[0].label, 2)
def test_Unary2():
parser = new_parser()
parser.init("2")
i, node = parser.Unary2(0)
eq(i, 1)
eq(node.label, 2)
def test_Unary_1():
parser = new_parser()
parser.init("-2")
i, node = parser.Unary(0)
eq(i, 2)
eq(node.label, "Neg")
eq(len(node.children), 1)
eq(node.children[0].label, 2)
def test_Unary_2():
parser = new_parser()
parser.init("2")
i, node = parser.Unary(0)
eq(i, 1)
eq(node.label, 2)
def test_collapse_None():
parser = new_parser()
eq(parser.collapse(Node(1), None), Node(1))
def test_collapse_subtree():
parser = new_parser()
eq(
parser.collapse(Node(1), ("*", Node(2))),
Node("*").addkid(Node(1)).addkid(Node(2))
)
@raises(ValueError)
def test_collapse_bad_subtree():
parser = new_parser()
parser.collapse(Node(1), Node("*"))
def test_1_Term():
parser = new_parser()
parser.init("1 * 2")
i, node = parser.Term(0)
eq(i, 3)
eq(node, Node("*").addkid(Node(1)).addkid(Node(2)))
def test_2_Term():
parser = new_parser()
parser.init("1 / 2")
i, node = parser.Term(0)
eq(i, 3)
eq(node, Node("/").addkid(Node(1)).addkid(Node(2)))
def test_3_Term():
parser = new_parser()
parser.init("1 / 2 * 3")
i, node = parser.Term(0)
eq(i, 5)
eq(node, Node("/")
.addkid(Node(1))
.addkid(
Node("*")
.addkid(Node(2))
.addkid(Node(3))
)
)
def test_4_Term():
parser = new_parser()
parser.init("(1 / 2) * 3")
i, node = parser.Term(0)
eq(i, 7)
eq(node, Node("*")
.addkid(
Node("/")
.addkid(Node(1))
.addkid(Node(2))
)
.addkid(Node(3))
)
def test_1_Term_():
parser = new_parser()
parser.init("* 2")
i, (op, right) = parser.Term_(0)
eq(i, 2)
eq(op, "*")
eq(right.label, 2)
def test_Term_1():
parser = new_parser()
parser.init("* 2")
i, (op, right) = parser.Term_1(0)
eq(i, 2)
eq(op, "*")
eq(right.label, 2)
@raises(SyntaxError)
def test_Term_1_bad():
parser = new_parser()
parser.init("2 * 2")
i, node = parser.Term_1(0)
def test_2_Term_():
parser = new_parser()
parser.init("/ 2")
i, (op, right) = parser.Term_(0)
eq(i, 2)
eq(op, "/")
eq(right.label, 2)
def test_Term_2():
parser = new_parser()
parser.init("/ 2")
i, (op, right) = parser.Term_2(0)
eq(i, 2)
eq(op, "/")
eq(right.label, 2)
@raises(SyntaxError)
def test_Term_2_bad():
parser = new_parser()
parser.init("2 / 2")
i, node = parser.Term_2(0)
def test_3_Term_():
parser = new_parser()
parser.init("+ 2")
i, n = parser.Term_(0)
eq(n, None)
def test_Term_3():
parser = new_parser()
parser.init("+ / - *")
i, n = parser.Term_3(0)
eq(i, 0)
eq(n, None)
def test_2_level_Term_():
parser = new_parser()
parser.init("* 2 * 3")
i, (op, right) = parser.Term_(0)
eq(op, "*")
eq(right.label, "*")
eq(len(right.children), 2)
eq(right.children[0].label, 2)
eq(right.children[1].label, 3)
def test_2_level_Term():
parser = new_parser()
parser.init("1 / 2 * 3")
i, node = parser.Term(0)
eq(node.label, "/")
eq(len(node.children), 2)
eq(node.children[0].label, 1)
eq(node.children[1].label, "*")
eq(len(node.children[1].children), 2)
eq(node.children[1].children[0].label, 2)
eq(node.children[1].children[1].label, 3)
def test_2_level_Expr_Term():
parser = new_parser()
parser.init("1 / 2 * 3")
i, node = parser.Expr(0)
eq(node.label, "/")
eq(len(node.children), 2)
eq(node.children[0].label, 1)
eq(node.children[1].label, "*")
eq(len(node.children[1].children), 2)
eq(node.children[1].children[0].label, 2)
eq(node.children[1].children[1].label, 3)
def test_1_Expr_():
parser = new_parser()
parser.init("+ 2")
i, (op, right) = parser.Expr_(0)
eq(i, 2)
eq(op, "+")
eq(right.label, 2)
def test_Expr_1():
parser = new_parser()
parser.init("+ 2")
i, (op, right) = parser.Expr_1(0)
eq(i, 2)
eq(op, "+")
eq(right.label, 2)
def test_2_Expr_():
parser = new_parser()
parser.init("- 2")
i, (op, right) = parser.Expr_(0)
eq(i, 2)
eq(op, "-")
eq(right.label, 2)
def test_Expr_2():
parser = new_parser()
parser.init("- 2")
i, (op, right) = parser.Expr_2(0)
eq(i, 2)
eq(op, "-")
eq(right.label, 2)
def test_3_Expr_():
parser = new_parser()
parser.init("2 2")
i, n = parser.Expr_(0)
eq(i, 0)
eq(n, None)
def test_Expr_3():
parser = new_parser()
parser.init("2 2")
i, n = parser.Expr_3(0)
eq(i, 0)
eq(n, None)
def test_Expr_Factor():
parser = new_parser()
parser.init("3")
i, node = parser.Expr(0)
eq(node.label, 3)
def test_Expr_Factor2():
parser = new_parser()
parser.init("(3)")
i, node = parser.Expr(0)
eq(i, 3)
eq(node.label, 3)
def test_Expr_Unary_Factor():
parser = new_parser()
parser.init("-3")
i, node = parser.Expr(0)
eq(i, 2)
eq(node, Node("Neg").addkid(Node(3)))
def test_Expr_Term_Unary():
parser = new_parser()
parser.init("1*-3")
i, node = parser.Expr(0)
eq(i, 4)
eq(node,
Node("*")
.addkid(Node(1))
.addkid(Node("Neg").addkid(Node(3)))
)
def test_Expr_Expr_Unary():
parser = new_parser()
parser.init("1--3")
i, node = parser.Expr(0)
eq(i, 4)
eq(node,
Node("-")
.addkid(Node(1))
.addkid(Node("Neg").addkid(Node(3)))
)
def test_Expr_Unary_Expr_Unary():
parser = new_parser()
parser.init("-1--3")
i, node = parser.Expr(0)
eq(i, 5)
eq(node,
Node("-")
.addkid(Node("Neg").addkid(Node(1)))
.addkid(Node("Neg").addkid(Node(3)))
)
def test_precidence_mul():
parser = new_parser()
parser.init("1*3+4")
i, node = parser.Expr(0)
eq(node,
Node("+")
.addkid(
Node("*").addkid(Node(1)).addkid(Node(3)))
.addkid(Node(4))
)
def test_precidence_mul2():
parser = new_parser()
parser.init("4+1*3")
i, node = parser.Expr(0)
eq(node,
Node("+")
.addkid(Node(4))
.addkid(
Node("*").addkid(Node(1)).addkid(Node(3)))
)
def test_precidence_mul3():
parser = new_parser()
parser.init("1*(3+4)")
i, node = parser.Expr(0)
eq(node,
Node("*")
.addkid(Node(1))
.addkid(
Node("+").addkid(Node(3)).addkid(Node(4)))
)
def test_precidence_mul4():
parser = new_parser()
parser.init("(3+4)*1")
i, node = parser.Expr(0)
eq(node,
Node("*")
.addkid(
Node("+").addkid(Node(3)).addkid(Node(4)))
.addkid(Node(1))
)
@raises(SyntaxError)
def test_parse_neg():
parser = new_parser()
parser.init("(3)-/3")
node = parser.parse()
def test_parse_complex():
parser = new_parser()
parser.init("2+3+4*(1+(5-2)/3)-4/3*(2+1)")
node = parser.parse()
expected = (
Node("+")
.addkid(Node(2))
.addkid(
Node("+")
.addkid(Node(3))
.addkid(
Node("-")
.addkid(
Node("*")
.addkid(Node(4))
.addkid(
Node("+")
.addkid(Node(1))
.addkid(
Node("/")
.addkid(
Node("-")
.addkid(Node(5))
.addkid(Node(2))
)
.addkid(Node(3))
)
)
)
.addkid(
Node("/")
.addkid(Node(4))
.addkid(
Node("*")
.addkid(Node(3))
.addkid(
Node("+")
.addkid(Node(2))
.addkid(Node(1))
)
)
)
)
)
)
eq(node, expected)