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parser_test.go
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// Copyright 2016 The OPA Authors. All rights reserved.
// Use of this source code is governed by an Apache2
// license that can be found in the LICENSE file.
package ast
import (
"encoding/json"
"fmt"
"reflect"
"strings"
"testing"
)
var _ = fmt.Printf
const (
testModule = `
# This policy module belongs the opa.example package.
package opa.examples
# Refer to data.servers as servers.
import data.servers
# Refer to the data.networks as networks.
import data.networks
# Refer to the data.ports as ports.
import data.ports
# A server exists in the violations set if...
violations[server] {
# ...the server exists
server = servers[i]
# ...and any of the server’s protocols is HTTP
server.protocols[j] = "http"
# ...and the server is public.
public_servers[server]
}
# A server exists in the public_servers set if...
public_servers[server] {
# Semicolons are optional. Can group expressions onto one line.
server = servers[i]; server.ports[j] = ports[k].id # ...and the server is connected to a port
ports[k].networks[l] = networks[m].id; # ...and the port is connected to a network
networks[m].public = true # ...and the network is public.
}`
)
func TestNumberTerms(t *testing.T) {
tests := []struct {
input string
expected string
}{
{"0", "0"},
{"100", "100"},
{"-1", "-1"},
{"1e6", "1e6"},
{"1.1e6", "1.1e6"},
{"-1e-6", "-1e-6"},
{"1E6", "1E6"},
{"0.1", "0.1"},
{".1", "0.1"},
{".0001", "0.0001"},
{"-.1", "-0.1"},
{"-0.0001", "-0.0001"},
{"1e1000", "1e1000"},
{"0e1", "0"},
{"-0.1", "-0.1"},
}
for _, tc := range tests {
result, err := ParseTerm(tc.input)
if err != nil {
t.Errorf("Unexpected error for %v: %v", tc.input, err)
} else {
e := NumberTerm(json.Number(tc.expected))
if !result.Equal(e) {
t.Errorf("Expected %v for %v but got: %v", e, tc.input, result)
}
}
}
}
func TestStringTerms(t *testing.T) {
tests := []struct {
input string
expected string
}{
{`""`, ""}, // empty
{`" "`, " "}, // whitespace
{`"\""`, `"`}, // escaped quote
{`"http:\/\/"`, `http://`}, // escaped solidus
{`"\u0001"`, "\x01"}, // control code
{`"foo\u005C"`, "foo\u005c"}, // unicode (upper hex)
{`"foo\u005c"`, "foo\u005C"}, // unicode (lower hex)
{`"\uD834\uDD1E"`, `𝄞`}, // g-clef
{"`hi\\there`", `hi\there`}, // basic raw string
{"`foo\nbar\n baz`", `foo
bar
baz`}, // multi-line raw string
}
for _, tc := range tests {
result, err := ParseTerm(tc.input)
if err != nil {
t.Errorf("Unexpected error for %v: %v", tc.input, err)
} else {
s := StringTerm(tc.expected)
if !result.Equal(s) {
t.Errorf("Expected %v for %v but got: %v", s, tc.input, result)
}
}
}
}
func TestScalarTerms(t *testing.T) {
assertParseOneTerm(t, "null", "null", NullTerm())
assertParseOneTerm(t, "true", "true", BooleanTerm(true))
assertParseOneTerm(t, "false", "false", BooleanTerm(false))
assertParseOneTerm(t, "integer", "53", IntNumberTerm(53))
assertParseOneTerm(t, "integer2", "-53", IntNumberTerm(-53))
assertParseOneTerm(t, "float", "16.7", FloatNumberTerm(16.7))
assertParseOneTerm(t, "float2", "-16.7", FloatNumberTerm(-16.7))
assertParseOneTerm(t, "exponent", "6e7", FloatNumberTerm(6e7))
assertParseOneTerm(t, "string", "\"a string\"", StringTerm("a string"))
assertParseOneTerm(t, "string", "\"a string u6abc7def8abc0def with unicode\"", StringTerm("a string u6abc7def8abc0def with unicode"))
assertParseErrorContains(t, "hex", "6abc", "illegal number format")
assertParseErrorContains(t, "non-terminated", "\"foo", "non-terminated string")
assertParseErrorContains(t, "non-terminated-raw", "`foo", "non-terminated string")
assertParseErrorContains(t, "non-string", "'a string'", "illegal token")
assertParseErrorContains(t, "non-number", "6zxy", "illegal number format")
assertParseErrorContains(t, "non-number2", "6d7", "illegal number format")
assertParseErrorContains(t, "non-number3", "6\"foo\"", "expected exactly one statement") // ??
assertParseErrorContains(t, "non-number4", "6true", "illegal number format")
assertParseErrorContains(t, "non-number5", "6false", "illegal number format")
assertParseErrorContains(t, "non-number6", "6[null, null]", "illegal ref (head cannot be number)") // ??
assertParseErrorContains(t, "non-number7", "6{\"foo\": \"bar\"}", "expected exactly one statement")
assertParseErrorContains(t, "non-number8", ".0.", "expected fraction")
assertParseErrorContains(t, "non-number9", "0e", "expected exponent")
assertParseErrorContains(t, "non-number10", "0e.", "expected exponent")
assertParseErrorContains(t, "non-number11", "0F", "illegal number format")
assertParseErrorContains(t, "non-number12", "00", "expected number")
assertParseErrorContains(t, "non-number13", "00.1", "expected number")
assertParseErrorContains(t, "non-number14", "-00", "expected number")
assertParseErrorContains(t, "non-number15", "-00.1", "expected number")
assertParseErrorContains(t, "non-number16", "-00.01", "expected number")
assertParseErrorContains(t, "non-number17", "00e1", "expected number")
assertParseErrorContains(t, "non-number18", "-00e1", "expected number")
assertParseErrorContains(t, "parsing float fails", "7e3000000000", "invalid float")
assertParseErrorContains(t, "float is +inf", "10245423601e680507880", "number too big")
assertParseErrorContains(t, "float is -inf", "-10245423601e680507880", "number too big")
// f := big.NewFloat(1); f.SetMantExp(f, -1e6); f.String() // => 1.010034059e-301030 (this takes ~9s)
assertParseErrorContains(t, "float exp < -1e5", "1.010034059e-301030", "number too big")
// g := big.NewFloat(1); g.SetMantExp(g, 1e6); g.String() // => 9.900656229e+301029
assertParseErrorContains(t, "float exp > 1e5", "9.900656229e+301029", "number too big")
}
func TestVarTerms(t *testing.T) {
assertParseOneTerm(t, "var", "foo", VarTerm("foo"))
assertParseOneTerm(t, "var", "foo_bar", VarTerm("foo_bar"))
assertParseOneTerm(t, "var", "foo0", VarTerm("foo0"))
assertParseOneTerm(t, "import prefix", "imports", VarTerm("imports"))
assertParseOneTerm(t, "not prefix", "not_foo", VarTerm("not_foo"))
assertParseOneTerm(t, `package prefix`, "packages", VarTerm("packages"))
assertParseOneTerm(t, `true prefix`, "trueish", VarTerm("trueish"))
assertParseOneTerm(t, `false prefix`, "false_flag", VarTerm("false_flag"))
assertParseOneTerm(t, `null prefix`, "nullable", VarTerm("nullable"))
assertParseError(t, "illegal token", `墳`)
assertParseError(t, "not keyword", "not")
assertParseError(t, `package keyword`, "package")
assertParseError(t, "import keyword", "import")
assertParseError(t, "import invalid path", "import x.")
}
func TestRefTerms(t *testing.T) {
assertParseOneTerm(t, "constants", "foo.bar.baz", RefTerm(VarTerm("foo"), StringTerm("bar"), StringTerm("baz")))
assertParseOneTerm(t, "constants 2", "foo.bar[0].baz", RefTerm(VarTerm("foo"), StringTerm("bar"), IntNumberTerm(0), StringTerm("baz")))
assertParseOneTerm(t, "variables", "foo.bar[0].baz[i]", RefTerm(VarTerm("foo"), StringTerm("bar"), IntNumberTerm(0), StringTerm("baz"), VarTerm("i")))
assertParseOneTerm(t, "spaces", "foo[\"white space\"].bar", RefTerm(VarTerm("foo"), StringTerm("white space"), StringTerm("bar")))
assertParseOneTerm(t, "nested", "foo[baz[1][borge[i]]].bar", RefTerm(
VarTerm("foo"),
RefTerm(
VarTerm("baz"), IntNumberTerm(1), RefTerm(
VarTerm("borge"), VarTerm("i"),
),
),
StringTerm("bar"),
))
assertParseOneTerm(t, "composite operand 1", "foo[[1,2,3]].bar", RefTerm(VarTerm("foo"), ArrayTerm(NumberTerm("1"), NumberTerm("2"), NumberTerm("3")), StringTerm("bar")))
assertParseOneTerm(t, "composite operand 2", `foo[{"foo": 2}].bar`, RefTerm(VarTerm("foo"), ObjectTerm(Item(StringTerm("foo"), NumberTerm("2"))), StringTerm("bar")))
assertParseError(t, "missing component 1", "foo.")
assertParseError(t, "missing component 2", "foo[].bar")
assertParseError(t, "invalid composite operand", "foo[1,2]")
assertParseError(t, "invalid call", "bar(..")
assertParseError(t, "invalid ref", "bar[..")
assertParseError(t, "invalid ref head type number", "0[0]")
assertParseError(t, "invalid ref head type boolean", "true[0]")
assertParseError(t, "invalid ref head type string", `"foo"[0]`)
assertParseError(t, "invalid ref head type null", `null[0]`)
}
func TestObjectWithScalars(t *testing.T) {
assertParseOneTerm(t, "number", "{\"abc\": 7, \"def\": 8}", ObjectTerm(Item(StringTerm("abc"), IntNumberTerm(7)), Item(StringTerm("def"), IntNumberTerm(8))))
assertParseOneTerm(t, "bool", "{\"abc\": false, \"def\": true}", ObjectTerm(Item(StringTerm("abc"), BooleanTerm(false)), Item(StringTerm("def"), BooleanTerm(true))))
assertParseOneTerm(t, "string", "{\"abc\": \"foo\", \"def\": \"bar\"}", ObjectTerm(Item(StringTerm("abc"), StringTerm("foo")), Item(StringTerm("def"), StringTerm("bar"))))
assertParseOneTerm(t, "mixed", "{\"abc\": 7, \"def\": null}", ObjectTerm(Item(StringTerm("abc"), IntNumberTerm(7)), Item(StringTerm("def"), NullTerm())))
assertParseOneTerm(t, "number key", "{8: 7, \"def\": null}", ObjectTerm(Item(IntNumberTerm(8), IntNumberTerm(7)), Item(StringTerm("def"), NullTerm())))
assertParseOneTerm(t, "number key 2", "{8.5: 7, \"def\": null}", ObjectTerm(Item(FloatNumberTerm(8.5), IntNumberTerm(7)), Item(StringTerm("def"), NullTerm())))
assertParseOneTerm(t, "bool key", "{true: false}", ObjectTerm(Item(BooleanTerm(true), BooleanTerm(false))))
assertParseOneTerm(t, "trailing comma", `{"a": "bar", "b": 64, }`, ObjectTerm(Item(StringTerm("a"), StringTerm("bar")), Item(StringTerm("b"), IntNumberTerm(64))))
assertParseOneTerm(t, "leading comma", `{, "a": "bar", "b": 64 }`, ObjectTerm(Item(StringTerm("a"), StringTerm("bar")), Item(StringTerm("b"), IntNumberTerm(64))))
assertParseOneTerm(t, "leading comma not comprehension", `{, 1 | 1: "bar"}`, ObjectTerm(Item(CallTerm(RefTerm(VarTerm("or")), NumberTerm("1"), NumberTerm("1")), StringTerm("bar"))))
}
func TestObjectWithVars(t *testing.T) {
assertParseOneTerm(t, "var keys", "{foo: \"bar\", bar: 64}", ObjectTerm(Item(VarTerm("foo"), StringTerm("bar")), Item(VarTerm("bar"), IntNumberTerm(64))))
assertParseOneTerm(t, "nested var keys", "{baz: {foo: \"bar\", bar: qux}}", ObjectTerm(Item(VarTerm("baz"), ObjectTerm(Item(VarTerm("foo"), StringTerm("bar")), Item(VarTerm("bar"), VarTerm("qux"))))))
assertParseOneTerm(t, "ambiguous or", `{ a: b+c | d }`, ObjectTerm(Item(VarTerm("a"), CallTerm(RefTerm(VarTerm("or")), CallTerm(RefTerm(VarTerm("plus")), VarTerm("b"), VarTerm("c")), VarTerm("d")))))
}
func TestObjectWithRelation(t *testing.T) {
assertParseOneTerm(t, "relation term value", `{"x": 1+1}`, ObjectTerm(
Item(StringTerm("x"), CallTerm(RefTerm(VarTerm("plus")), IntNumberTerm(1), IntNumberTerm(1))),
))
assertParseError(t, "invalid relation term value", `{"x": 0= }`)
}
func TestObjectFail(t *testing.T) {
assertParseError(t, "non-terminated 1", "{foo: bar, baz: [], qux: corge")
assertParseError(t, "non-terminated 2", "{foo: bar, baz: [], qux: ")
assertParseError(t, "non-terminated 3", "{foo: bar, baz: [], qux ")
assertParseError(t, "non-terminated 4", "{foo: bar, baz: [], ")
assertParseError(t, "missing separator", "{foo: bar baz: []}")
assertParseError(t, "missing start", "foo: bar, baz: [], qux: corge}")
assertParseError(t, "double comma", "{a:1,,b:2}")
assertParseError(t, "leading double comma", "{,,a:1}")
assertParseError(t, "trailing double comma", "{a:1,,}")
}
func TestArrayWithScalars(t *testing.T) {
assertParseOneTerm(t, "number", "[1,2,3,4.5]", ArrayTerm(IntNumberTerm(1), IntNumberTerm(2), IntNumberTerm(3), FloatNumberTerm(4.5)))
assertParseOneTerm(t, "bool", "[true, false, true]", ArrayTerm(BooleanTerm(true), BooleanTerm(false), BooleanTerm(true)))
assertParseOneTerm(t, "string", "[\"foo\", \"bar\"]", ArrayTerm(StringTerm("foo"), StringTerm("bar")))
assertParseOneTerm(t, "mixed", "[null, true, 42]", ArrayTerm(NullTerm(), BooleanTerm(true), IntNumberTerm(42)))
assertParseOneTerm(t, "trailing comma - one element", "[null, ]", ArrayTerm(NullTerm()))
assertParseOneTerm(t, "trailing comma", "[null, true, ]", ArrayTerm(NullTerm(), BooleanTerm(true)))
assertParseOneTerm(t, "leading comma", "[, null, true]", ArrayTerm(NullTerm(), BooleanTerm(true)))
assertParseOneTerm(t, "leading comma not comprehension", "[, 1 | 1]", ArrayTerm(CallTerm(RefTerm(VarTerm("or")), NumberTerm("1"), NumberTerm("1"))))
assertParseOneTerm(t, "ambiguous or", "[ 1 + 2 | 3 ]", ArrayTerm(CallTerm(RefTerm(VarTerm("or")), CallTerm(RefTerm(VarTerm("plus")), NumberTerm("1"), NumberTerm("2")), NumberTerm("3"))))
}
func TestArrayWithVars(t *testing.T) {
assertParseOneTerm(t, "var elements", "[foo, bar, 42]", ArrayTerm(VarTerm("foo"), VarTerm("bar"), IntNumberTerm(42)))
assertParseOneTerm(t, "nested var elements", "[[foo, true], [null, bar], 42]", ArrayTerm(ArrayTerm(VarTerm("foo"), BooleanTerm(true)), ArrayTerm(NullTerm(), VarTerm("bar")), IntNumberTerm(42)))
}
func TestArrayFail(t *testing.T) {
assertParseError(t, "non-terminated 1", "[foo, bar")
assertParseError(t, "non-terminated 2", "[foo, bar, ")
assertParseError(t, "missing separator", "[foo bar]")
assertParseError(t, "missing start", "foo, bar, baz]")
assertParseError(t, "bad term", "[!!!]")
assertParseError(t, "double comma", "[a,,b]")
assertParseError(t, "leading double comma", "[,,a]")
assertParseError(t, "trailing double comma", "[a,,]")
}
func TestSetWithScalars(t *testing.T) {
assertParseOneTerm(t, "number", "{1,2,3,4.5}", SetTerm(IntNumberTerm(1), IntNumberTerm(2), IntNumberTerm(3), FloatNumberTerm(4.5)))
assertParseOneTerm(t, "bool", "{true, false, true}", SetTerm(BooleanTerm(true), BooleanTerm(false), BooleanTerm(true)))
assertParseOneTerm(t, "string", "{\"foo\", \"bar\"}", SetTerm(StringTerm("foo"), StringTerm("bar")))
assertParseOneTerm(t, "mixed", "{null, true, 42}", SetTerm(NullTerm(), BooleanTerm(true), IntNumberTerm(42)))
assertParseOneTerm(t, "trailing comma", "{null, true,}", SetTerm(NullTerm(), BooleanTerm(true)))
assertParseOneTerm(t, "leading comma", "{, null, true}", SetTerm(NullTerm(), BooleanTerm(true)))
assertParseOneTerm(t, "leading comma not comprehension", "{, 1 | 1}", SetTerm(CallTerm(RefTerm(VarTerm("or")), NumberTerm("1"), NumberTerm("1"))))
assertParseOneTerm(t, "ambiguous or", "{ 1 + 2 | 3}", SetTerm(CallTerm(RefTerm(VarTerm("or")), CallTerm(RefTerm(VarTerm("plus")), NumberTerm("1"), NumberTerm("2")), NumberTerm("3"))))
}
func TestSetWithVars(t *testing.T) {
assertParseOneTerm(t, "var elements", "{foo, bar, 42}", SetTerm(VarTerm("foo"), VarTerm("bar"), IntNumberTerm(42)))
assertParseOneTerm(t, "nested var elements", "{[foo, true], {null, bar}, set()}", SetTerm(ArrayTerm(VarTerm("foo"), BooleanTerm(true)), SetTerm(NullTerm(), VarTerm("bar")), SetTerm()))
}
func TestSetFail(t *testing.T) {
assertParseError(t, "non-terminated 1", "set(")
assertParseError(t, "non-terminated 2", "{foo, bar")
assertParseError(t, "non-terminated 3", "{foo, bar, ")
assertParseError(t, "missing separator", "{foo bar}")
assertParseError(t, "missing start", "foo, bar, baz}")
assertParseError(t, "bad term", "{!!!}")
assertParseError(t, "double comma", "{a,,b}")
assertParseError(t, "leading double comma", "{,,a}")
assertParseError(t, "trailing double comma", "{a,,}")
}
func TestEmptyComposites(t *testing.T) {
assertParseOneTerm(t, "empty object", "{}", ObjectTerm())
assertParseOneTerm(t, "empty array", "[]", ArrayTerm())
assertParseOneTerm(t, "empty set", "set()", SetTerm())
}
func TestNestedComposites(t *testing.T) {
assertParseOneTerm(t, "nested composites", "[{foo: [\"bar\", {baz}]}]", ArrayTerm(ObjectTerm(Item(VarTerm("foo"), ArrayTerm(StringTerm("bar"), SetTerm(VarTerm("baz")))))))
}
func TestCompositesWithRefs(t *testing.T) {
ref1 := RefTerm(VarTerm("a"), VarTerm("i"), StringTerm("b"))
ref2 := RefTerm(VarTerm("c"), IntNumberTerm(0), StringTerm("d"), StringTerm("e"), VarTerm("j"))
assertParseOneTerm(t, "ref keys", "[{a[i].b: 8, c[0][\"d\"].e[j]: f}]", ArrayTerm(ObjectTerm(Item(ref1, IntNumberTerm(8)), Item(ref2, VarTerm("f")))))
assertParseOneTerm(t, "ref values", "[{8: a[i].b, f: c[0][\"d\"].e[j]}]", ArrayTerm(ObjectTerm(Item(IntNumberTerm(8), ref1), Item(VarTerm("f"), ref2))))
assertParseOneTerm(t, "ref values (sets)", `{a[i].b, {c[0]["d"].e[j]}}`, SetTerm(ref1, SetTerm(ref2)))
}
func TestArrayComprehensions(t *testing.T) {
nestedTerm := `[{"x": [a[i] | xs = [{"a": ["baz", j]} | q[p]; p.a != "bar"; j = "foo"]; xs[j].a[k] = "foo"]}]`
nestedExpected := ArrayTerm(
ObjectTerm(Item(
StringTerm("x"),
ArrayComprehensionTerm(
RefTerm(VarTerm("a"), VarTerm("i")),
NewBody(
Equality.Expr(
VarTerm("xs"),
ArrayComprehensionTerm(
ObjectTerm(Item(StringTerm("a"), ArrayTerm(StringTerm("baz"), VarTerm("j")))),
NewBody(
NewExpr(RefTerm(VarTerm("q"), VarTerm("p"))),
NotEqual.Expr(RefTerm(VarTerm("p"), StringTerm("a")), StringTerm("bar")),
Equality.Expr(VarTerm("j"), StringTerm("foo")),
),
),
),
Equality.Expr(
RefTerm(VarTerm("xs"), VarTerm("j"), StringTerm("a"), VarTerm("k")),
StringTerm("foo"),
),
),
),
)),
)
assertParseOneTerm(t, "nested", nestedTerm, nestedExpected)
assertParseOneTerm(t, "ambiguous or", "[ a | b ]", ArrayComprehensionTerm(
VarTerm("a"),
MustParseBody("b"),
))
}
func TestObjectComprehensions(t *testing.T) {
nestedTerm := `[{"x": {a[i]: b[i] | xs = {"foo":{"a": ["baz", j]} | q[p]; p.a != "bar"; j = "foo"}; xs[j].a[k] = "foo"}}]`
nestedExpected := ArrayTerm(
ObjectTerm(Item(
StringTerm("x"),
ObjectComprehensionTerm(
RefTerm(VarTerm("a"), VarTerm("i")),
RefTerm(VarTerm("b"), VarTerm("i")),
NewBody(
Equality.Expr(
VarTerm("xs"),
ObjectComprehensionTerm(
StringTerm("foo"),
ObjectTerm(Item(StringTerm("a"), ArrayTerm(StringTerm("baz"), VarTerm("j")))),
NewBody(
NewExpr(RefTerm(VarTerm("q"), VarTerm("p"))),
NotEqual.Expr(RefTerm(VarTerm("p"), StringTerm("a")), StringTerm("bar")),
Equality.Expr(VarTerm("j"), StringTerm("foo")),
),
),
),
Equality.Expr(
RefTerm(VarTerm("xs"), VarTerm("j"), StringTerm("a"), VarTerm("k")),
StringTerm("foo"),
),
),
),
)),
)
assertParseOneTerm(t, "nested", nestedTerm, nestedExpected)
assertParseOneTerm(t, "ambiguous or", "{ 1+2: 3 | 4}", ObjectComprehensionTerm(
CallTerm(RefTerm(VarTerm("plus")), NumberTerm("1"), NumberTerm("2")),
NumberTerm("3"),
MustParseBody("4"),
))
}
func TestObjectComprehensionError(t *testing.T) {
assertParseError(t, "bad body", "{x: y|!!!}")
}
func TestSetComprehensions(t *testing.T) {
nestedTerm := `[{"x": {a[i] | xs = {{"a": ["baz", j]} | q[p]; p.a != "bar"; j = "foo"}; xs[j].a[k] = "foo"}}]`
nestedExpected := ArrayTerm(
ObjectTerm(Item(
StringTerm("x"),
SetComprehensionTerm(
RefTerm(VarTerm("a"), VarTerm("i")),
NewBody(
Equality.Expr(
VarTerm("xs"),
SetComprehensionTerm(
ObjectTerm(Item(StringTerm("a"), ArrayTerm(StringTerm("baz"), VarTerm("j")))),
NewBody(
NewExpr(RefTerm(VarTerm("q"), VarTerm("p"))),
NotEqual.Expr(RefTerm(VarTerm("p"), StringTerm("a")), StringTerm("bar")),
Equality.Expr(VarTerm("j"), StringTerm("foo")),
),
),
),
Equality.Expr(
RefTerm(VarTerm("xs"), VarTerm("j"), StringTerm("a"), VarTerm("k")),
StringTerm("foo"),
),
),
),
)),
)
assertParseOneTerm(t, "nested", nestedTerm, nestedExpected)
assertParseOneTerm(t, "ambiguous or", "{ a | b }", SetComprehensionTerm(
VarTerm("a"),
MustParseBody("b"),
))
}
func TestSetComprehensionError(t *testing.T) {
assertParseError(t, "bad body", "{x|!!!}")
}
func TestSetComprehensionsAlone(t *testing.T) {
input := `{k | a = [1,2,3]; a[k]}`
expected := SetComprehensionTerm(
VarTerm("k"),
NewBody(
Equality.Expr(
VarTerm("a"),
ArrayTerm(NumberTerm("1"), NumberTerm("2"), NumberTerm("3")),
),
&Expr{
Terms: RefTerm(VarTerm("a"), VarTerm("k")),
},
),
)
assertParseOneTerm(t, "alone", input, expected)
}
func TestCalls(t *testing.T) {
assertParseOneExpr(t, "ne", "100 != 200", NotEqual.Expr(IntNumberTerm(100), IntNumberTerm(200)))
assertParseOneExpr(t, "gt", "17.4 > \"hello\"", GreaterThan.Expr(FloatNumberTerm(17.4), StringTerm("hello")))
assertParseOneExpr(t, "lt", "17.4 < \"hello\"", LessThan.Expr(FloatNumberTerm(17.4), StringTerm("hello")))
assertParseOneExpr(t, "gte", "17.4 >= \"hello\"", GreaterThanEq.Expr(FloatNumberTerm(17.4), StringTerm("hello")))
assertParseOneExpr(t, "lte", "17.4 <= \"hello\"", LessThanEq.Expr(FloatNumberTerm(17.4), StringTerm("hello")))
left2 := ArrayTerm(ObjectTerm(Item(FloatNumberTerm(14.2), BooleanTerm(true)), Item(StringTerm("a"), NullTerm())))
right2 := ObjectTerm(Item(VarTerm("foo"), ObjectTerm(Item(RefTerm(VarTerm("a"), StringTerm("b"), IntNumberTerm(0)), ArrayTerm(IntNumberTerm(10))))))
assertParseOneExpr(t, "composites", "[{14.2: true, \"a\": null}] != {foo: {a.b[0]: [10]}}", NotEqual.Expr(left2, right2))
assertParseOneExpr(t, "plus", "1 + 2", Plus.Expr(IntNumberTerm(1), IntNumberTerm(2)))
assertParseOneExpr(t, "minus", "1 - 2", Minus.Expr(IntNumberTerm(1), IntNumberTerm(2)))
assertParseOneExpr(t, "mul", "1 * 2", Multiply.Expr(IntNumberTerm(1), IntNumberTerm(2)))
assertParseOneExpr(t, "div", "1 / 2", Divide.Expr(IntNumberTerm(1), IntNumberTerm(2)))
assertParseOneExpr(t, "rem", "3 % 2", Rem.Expr(IntNumberTerm(3), IntNumberTerm(2)))
assertParseOneExpr(t, "and", "{1,2,3} & {2,3,4}", And.Expr(SetTerm(IntNumberTerm(1), IntNumberTerm(2), IntNumberTerm(3)), SetTerm(IntNumberTerm(2), IntNumberTerm(3), IntNumberTerm(4))))
assertParseOneExpr(t, "or", "{1,2,3} | {3,4,5}", Or.Expr(SetTerm(IntNumberTerm(1), IntNumberTerm(2), IntNumberTerm(3)), SetTerm(IntNumberTerm(3), IntNumberTerm(4), IntNumberTerm(5))))
assertParseOneExpr(t, "call", "count([true, false])", Count.Expr(ArrayTerm(BooleanTerm(true), BooleanTerm(false))))
assertParseOneExpr(t, "call-ref", "foo.bar(1)", NewExpr(
[]*Term{RefTerm(VarTerm("foo"), StringTerm("bar")),
IntNumberTerm(1)}))
assertParseOneExpr(t, "call-void", "foo()", NewExpr(
[]*Term{RefTerm(VarTerm("foo"))}))
}
func TestInfixExpr(t *testing.T) {
assertParseOneExpr(t, "scalars 1", "true = false", Equality.Expr(BooleanTerm(true), BooleanTerm(false)))
assertParseOneExpr(t, "scalars 2", "3.14 = null", Equality.Expr(FloatNumberTerm(3.14), NullTerm()))
assertParseOneExpr(t, "scalars 3", "42 = \"hello world\"", Equality.Expr(IntNumberTerm(42), StringTerm("hello world")))
assertParseOneExpr(t, "vars 1", "hello = world", Equality.Expr(VarTerm("hello"), VarTerm("world")))
assertParseOneExpr(t, "vars 2", "42 = hello", Equality.Expr(IntNumberTerm(42), VarTerm("hello")))
ref1 := RefTerm(VarTerm("foo"), IntNumberTerm(0), StringTerm("bar"), VarTerm("x"))
ref2 := RefTerm(VarTerm("baz"), BooleanTerm(false), StringTerm("qux"), StringTerm("hello"))
assertParseOneExpr(t, "refs 1", "foo[0].bar[x] = baz[false].qux[\"hello\"]", Equality.Expr(ref1, ref2))
left1 := ObjectTerm(Item(VarTerm("a"), ArrayTerm(ref1)))
right1 := ArrayTerm(ObjectTerm(Item(IntNumberTerm(42), BooleanTerm(true))))
assertParseOneExpr(t, "composites", "{a: [foo[0].bar[x]]} = [{42: true}]", Equality.Expr(left1, right1))
assertParseOneExpr(t, "plus", "x = 1 + 2", Equality.Expr(VarTerm("x"), Plus.Call(IntNumberTerm(1), IntNumberTerm(2))))
assertParseOneExpr(t, "plus reverse", "1 + 2 = x", Equality.Expr(Plus.Call(IntNumberTerm(1), IntNumberTerm(2)), VarTerm("x")))
assertParseOneExpr(t, "call", "count([true, false]) = x", Equality.Expr(Count.Call(ArrayTerm(BooleanTerm(true), BooleanTerm(false))), VarTerm("x")))
assertParseOneExpr(t, "call-reverse", "x = count([true, false])", Equality.Expr(VarTerm("x"), Count.Call(ArrayTerm(BooleanTerm(true), BooleanTerm(false)))))
}
func TestNegatedExpr(t *testing.T) {
assertParseOneTermNegated(t, "scalars 1", "not true", BooleanTerm(true))
assertParseOneTermNegated(t, "scalars 2", "not \"hello\"", StringTerm("hello"))
assertParseOneTermNegated(t, "scalars 3", "not 100", IntNumberTerm(100))
assertParseOneTermNegated(t, "scalars 4", "not null", NullTerm())
assertParseOneTermNegated(t, "var", "not x", VarTerm("x"))
assertParseOneTermNegated(t, "ref", "not x[y].z", RefTerm(VarTerm("x"), VarTerm("y"), StringTerm("z")))
assertParseOneExprNegated(t, "vars", "not x = y", Equality.Expr(VarTerm("x"), VarTerm("y")))
ref1 := RefTerm(VarTerm("x"), VarTerm("y"), StringTerm("z"), VarTerm("a"))
assertParseOneExprNegated(t, "membership", "not x[y].z[a] = \"b\"", Equality.Expr(ref1, StringTerm("b")))
assertParseOneExprNegated(t, "misc. builtin", "not sorted(x[y].z[a])", NewExpr([]*Term{RefTerm(VarTerm("sorted")), ref1}))
}
func TestExprWith(t *testing.T) {
assertParseOneExpr(t, "input", "data.foo with input as baz", &Expr{
Terms: MustParseTerm("data.foo"),
With: []*With{
{
Target: NewTerm(InputRootRef),
Value: VarTerm("baz"),
},
},
})
assertParseOneExpr(t, "builtin/ref target/composites", `plus(data.foo, 1, x) with input.com.acmecorp.obj as {"count": [{1,2,3}]}`, &Expr{
Terms: MustParseExpr("plus(data.foo, 1, x)").Terms,
With: []*With{
{
Target: MustParseTerm("input.com.acmecorp.obj"),
Value: MustParseTerm(`{"count": [{1,2,3}]}`),
},
},
})
assertParseOneExpr(t, "multiple", `data.foo with input.obj as baz with input.com.acmecorp.obj as {"count": [{1,2,3}]}`, &Expr{
Terms: MustParseTerm("data.foo"),
With: []*With{
{
Target: MustParseTerm("input.obj"),
Value: VarTerm("baz"),
},
{
Target: MustParseTerm("input.com.acmecorp.obj"),
Value: MustParseTerm(`{"count": [{1,2,3}]}`),
},
},
})
assertParseOneExpr(t, "variable target", "true with x as 1", &Expr{
Terms: BooleanTerm(true),
With: []*With{
{
Target: VarTerm("x"),
Value: IntNumberTerm(1),
},
},
})
}
func TestExprWithLocation(t *testing.T) {
cases := []struct {
note string
input string
expected []*Location
}{
{
note: "base",
input: "a with b as c",
expected: []*Location{
{
Row: 1,
Col: 3,
Offset: 2,
Text: []byte("with b as c"),
},
},
},
{
note: "with line break",
input: "a with b\nas c",
expected: []*Location{
{
Row: 1,
Col: 3,
Offset: 2,
Text: []byte("with b\nas c"),
},
},
},
{
note: "multiple withs on single line",
input: "a with b as c with d as e",
expected: []*Location{
{
Row: 1,
Col: 3,
Offset: 2,
Text: []byte("with b as c"),
},
{
Row: 1,
Col: 15,
Offset: 14,
Text: []byte("with d as e"),
},
},
},
{
note: "multiple withs on multiple line",
input: "a with b as c\n\t\twith d as e",
expected: []*Location{
{
Row: 1,
Col: 3,
Offset: 2,
Text: []byte("with b as c"),
},
{
Row: 2,
Col: 3,
Offset: 16,
Text: []byte("with d as e"),
},
},
},
}
for _, tc := range cases {
t.Run(tc.note, func(t *testing.T) {
parsed, err := ParseStatement(tc.input)
if err != nil {
t.Errorf("Unexpected error on %s: %s", tc.input, err)
return
}
body := parsed.(Body)
if len(body) != 1 {
t.Errorf("Parser returned multiple expressions: %v", body)
return
}
expr := body[0]
if len(expr.With) != len(tc.expected) {
t.Fatalf("Expected %d with statements, got %d", len(expr.With), len(tc.expected))
}
for i, with := range expr.With {
if !with.Location.Equal(tc.expected[i]) {
t.Errorf("Expected location %+v for '%v' but got %+v ", *(tc.expected[i]), with.String(), *with.Location)
}
}
})
}
}
func TestSomeDeclExpr(t *testing.T) {
assertParseOneExpr(t, "one", "some x", &Expr{
Terms: &SomeDecl{
Symbols: []*Term{
VarTerm("x"),
},
},
})
assertParseOneExpr(t, "multiple", "some x, y", &Expr{
Terms: &SomeDecl{
Symbols: []*Term{
VarTerm("x"),
VarTerm("y"),
},
},
})
assertParseOneExpr(t, "multiple split across lines", `some x, y,
z`, &Expr{
Terms: &SomeDecl{
Symbols: []*Term{
VarTerm("x"),
VarTerm("y"),
VarTerm("z"),
},
},
})
assertParseRule(t, "whitespace separated", `
p[x] {
some x
q[x]
}
`, &Rule{
Head: NewHead(Var("p"), VarTerm("x")),
Body: NewBody(
NewExpr(&SomeDecl{Symbols: []*Term{VarTerm("x")}}),
NewExpr(RefTerm(VarTerm("q"), VarTerm("x"))),
),
})
assertParseRule(t, "whitespace terminated", `
p[x] {
some x
x
}
`, &Rule{
Head: NewHead(Var("p"), VarTerm("x")),
Body: NewBody(
NewExpr(&SomeDecl{Symbols: []*Term{VarTerm("x")}}),
NewExpr(VarTerm("x")),
),
})
}
func TestNestedExpressions(t *testing.T) {
n1 := IntNumberTerm(1)
n2 := IntNumberTerm(2)
n3 := IntNumberTerm(3)
n4 := IntNumberTerm(4)
n6 := IntNumberTerm(6)
x := VarTerm("x")
y := VarTerm("y")
z := VarTerm("z")
w := VarTerm("w")
f := RefTerm(VarTerm("f"))
g := RefTerm(VarTerm("g"))
tests := []struct {
note string
input string
expected *Expr
}{
{"associativity", "1 + 2 * 6 / 3",
Plus.Expr(
n1,
Divide.Call(
Multiply.Call(
n2,
n6),
n3))},
{"associativity - factors", "x * y / z % w",
Rem.Expr(Divide.Call(Multiply.Call(x, y), z), w)},
{"associativity - factors", "w % z / x * y",
Multiply.Expr(Divide.Call(Rem.Call(w, z), x), y)},
{"associativity - arithetic", "x + y - z",
Minus.Expr(Plus.Call(x, y), z)},
{"associativity - arithmetic", "z - x + y",
Plus.Expr(Minus.Call(z, x), y)},
{"associativity - and", "z & x & y",
And.Expr(And.Call(z, x), y)},
{"associativity - or", "z | x | y",
Or.Expr(Or.Call(z, x), y)},
{"associativity - relations", "x == y != z",
NotEqual.Expr(Equal.Call(x, y), z)},
{"grouping", "(1 + 2 * 6 / 3) > 4",
GreaterThan.Expr(
Plus.Call(
n1,
Divide.Call(
Multiply.Call(
n2,
n6),
n3)),
n4)},
{"nested parens", "(((1 + 2) * (6 / (3))) > 4) != false",
NotEqual.Expr(
GreaterThan.Call(
Multiply.Call(
Plus.Call(
n1,
n2),
Divide.Call(
n6,
n3)),
n4,
),
BooleanTerm(false))},
{"bitwise or", "x + 1 | 2", Or.Expr(Plus.Call(x, n1), n2)},
{"bitwise and", "x + 1 | 2 & 3", Or.Expr(Plus.Call(x, n1), And.Call(n2, n3))},
{"array", "[x + 1, y > 2, z]", NewExpr(ArrayTerm(Plus.Call(x, n1), GreaterThan.Call(y, n2), z))},
{"object", "{x * 2: y < 2, z[3]: 1 + 6/2}", NewExpr(
ObjectTerm(
Item(Multiply.Call(x, n2), LessThan.Call(y, n2)),
Item(RefTerm(z, n3), Plus.Call(n1, Divide.Call(n6, n2))),
),
)},
{"set", "{x + 1, y + 2, set()}", NewExpr(
SetTerm(
Plus.Call(x, n1),
Plus.Call(y, n2),
SetTerm(),
),
)},
{"ref", `x[1][y + z[w + 1]].b`, NewExpr(
RefTerm(
x,
n1,
Plus.Call(
y,
RefTerm(
z,
Plus.Call(w, n1))),
StringTerm("b"),
),
)},
{"call void", "f()", NewExpr([]*Term{f})},
{"call unary", "f(x)", NewExpr([]*Term{f, x})},
{"call binary", "f(x, y)", NewExpr([]*Term{f, x, y})},
{"call embedded", "f([g(x), y+1])", NewExpr([]*Term{
f,
ArrayTerm(
CallTerm(g, x),
Plus.Call(y, n1))})},
{"call fqn", "foo.bar(1)", NewExpr([]*Term{
RefTerm(VarTerm("foo"), StringTerm("bar")),
n1,
})},
{"unify", "x = 1", Equality.Expr(x, n1)},
{"unify embedded", "1 + x = 2 - y", Equality.Expr(Plus.Call(n1, x), Minus.Call(n2, y))},
{"not keyword", "not x = y", Equality.Expr(x, y).Complement()},
{"with keyword", "x with p[q] as f([x+1])", NewExpr(x).IncludeWith(
RefTerm(VarTerm("p"), VarTerm("q")),
CallTerm(f, ArrayTerm(Plus.Call(x, n1))),
)},
}
for _, tc := range tests {
t.Run(tc.note, func(t *testing.T) {
expr, err := ParseExpr(tc.input)
if err != nil {
t.Fatal(err)
}
if !expr.Equal(tc.expected) {
t.Fatalf("Expected %v but got %v", tc.expected, expr)
}
})
}
}
func TestChainedCall(t *testing.T) {
result, err := ParseExpr("foo.bar(1)[0](1).baz")
if err != nil {
t.Fatal(err)
}
exp := NewExpr(RefTerm(
CallTerm(
RefTerm(
CallTerm(
RefTerm(VarTerm("foo"), StringTerm("bar")),
IntNumberTerm(1)),
IntNumberTerm(0)),
IntNumberTerm(1)),
StringTerm("baz")))
if !result.Equal(exp) {
t.Fatalf("expected %v but got: %v", exp, result)
}
}
func TestMultiLineBody(t *testing.T) {
input1 := `
x = 1
y = 2
z = [ i | [x,y] = arr
arr[_] = i]
`
body1, err := ParseBody(input1)
if err != nil {
t.Fatalf("Unexpected parse error on enclosed body: %v", err)
}
expected1 := MustParseBody(`x = 1; y = 2; z = [i | [x,y] = arr; arr[_] = i]`)
if !body1.Equal(expected1) {
t.Errorf("Expected enclosed body to equal %v but got: %v", expected1, body1)
}
// Check that parser can handle multiple expressions w/o enclosing braces.
input2 := `
x = 1 ; # comment after semicolon
y = 2 # comment without semicolon
z = [ i | [x,y] = arr # comment in comprehension
arr[_] = i]
`
body2, err := ParseBody(input2)
if err != nil {
t.Fatalf("Unexpected parse error on enclosed body: %v", err)
}
if !body2.Equal(expected1) {
t.Errorf("Expected unenclosed body to equal %v but got: %v", expected1, body1)
}
assertParseOneBody(t, "whitespace following call", "f(x)\t\n [1]", NewBody(
NewExpr(
[]*Term{
RefTerm(VarTerm("f")),
VarTerm("x"),
},
),
NewExpr(
ArrayTerm(IntNumberTerm(1)),
),
))
assertParseOneBody(t, "whitespace following array", "[1]\t\n [2]", NewBody(
NewExpr(
ArrayTerm(IntNumberTerm(1)),
),
NewExpr(
ArrayTerm(IntNumberTerm(2)),
),
))
assertParseOneBody(t, "whitespace following set", "{1}\t\n {2}", NewBody(
NewExpr(
SetTerm(IntNumberTerm(1)),
),
NewExpr(
SetTerm(IntNumberTerm(2)),
),
))
}
func TestBitwiseOrVsComprehension(t *testing.T) {
x := VarTerm("x")
y := VarTerm("y")
z := VarTerm("z")
a := VarTerm("a")
b := VarTerm("b")
tests := []struct {
note string
input string
exp *Term
}{
{
note: "array containing bitwise or",
input: "[x|y,z]",
exp: ArrayTerm(Or.Call(x, y), z),
},
{
note: "array containing bitwise or - last element",
input: "[z,x|y]",
exp: ArrayTerm(z, Or.Call(x, y)),
},
{
note: "array containing bitwise or - middle",
input: "[z,x|y,a]",
exp: ArrayTerm(z, Or.Call(x, y), a),
},
{
note: "array containing single bitwise or",
input: "[x|y,]",
exp: ArrayTerm(Or.Call(x, y)),
},
{
note: "set containing bitwise or",
input: "{x|y,z}",
exp: SetTerm(Or.Call(x, y), z),
},
{
note: "set containing bitwise or - last element",
input: "{z,x|y}",
exp: SetTerm(z, Or.Call(x, y)),
},
{
note: "set containing bitwise or - middle",
input: "{z,x|y,a}",
exp: SetTerm(z, Or.Call(x, y), a),
},
{
note: "set containing single bitwise or",
input: "{x|y,}",
exp: SetTerm(Or.Call(x, y)),
},
{
note: "object containing bitwise or",
input: "{x:y|z,a:b}",
exp: ObjectTerm([2]*Term{x, Or.Call(y, z)}, [2]*Term{a, b}),
},
{
note: "object containing single bitwise or",
input: "{x:y|z,}",
exp: ObjectTerm([2]*Term{x, Or.Call(y, z)}),
},
}
for _, tc := range tests {
t.Run(tc.note, func(t *testing.T) {
term, err := ParseTerm(tc.input)
if err != nil {
t.Fatal(err)
}