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package parser_test
import (
"fmt"
"strings"
"testing"
"github.com/antonmedv/expr/ast"
"github.com/antonmedv/expr/parser"
"github.com/stretchr/testify/assert"
)
func TestParse(t *testing.T) {
parseTests := []struct {
input string
expected ast.Node
}{
{
"a",
&ast.IdentifierNode{Value: "a"},
},
{
`"str"`,
&ast.StringNode{Value: "str"},
},
{
"3",
&ast.IntegerNode{Value: 3},
},
{
"0xFF",
&ast.IntegerNode{Value: 255},
},
{
"10_000_000",
&ast.IntegerNode{Value: 10_000_000},
},
{
"2.5",
&ast.FloatNode{Value: 2.5},
},
{
"1e9",
&ast.FloatNode{Value: 1e9},
},
{
"true",
&ast.BoolNode{Value: true},
},
{
"false",
&ast.BoolNode{Value: false},
},
{
"nil",
&ast.NilNode{},
},
{
"-3",
&ast.UnaryNode{Operator: "-", Node: &ast.IntegerNode{Value: 3}},
},
{
"1 - 2",
&ast.BinaryNode{Operator: "-", Left: &ast.IntegerNode{Value: 1}, Right: &ast.IntegerNode{Value: 2}},
},
{
"(1 - 2) * 3",
&ast.BinaryNode{
Operator: "*",
Left: &ast.BinaryNode{
Operator: "-", Left: &ast.IntegerNode{Value: 1},
Right: &ast.IntegerNode{Value: 2},
}, Right: &ast.IntegerNode{Value: 3},
},
},
{
"a or b or c",
&ast.BinaryNode{Operator: "or", Left: &ast.BinaryNode{Operator: "or", Left: &ast.IdentifierNode{Value: "a"}, Right: &ast.IdentifierNode{Value: "b"}}, Right: &ast.IdentifierNode{Value: "c"}},
},
{
"a or b and c",
&ast.BinaryNode{Operator: "or", Left: &ast.IdentifierNode{Value: "a"}, Right: &ast.BinaryNode{Operator: "and", Left: &ast.IdentifierNode{Value: "b"}, Right: &ast.IdentifierNode{Value: "c"}}},
},
{
"(a or b) and c",
&ast.BinaryNode{Operator: "and", Left: &ast.BinaryNode{Operator: "or", Left: &ast.IdentifierNode{Value: "a"}, Right: &ast.IdentifierNode{Value: "b"}}, Right: &ast.IdentifierNode{Value: "c"}},
},
{
"2**4-1",
&ast.BinaryNode{Operator: "-", Left: &ast.BinaryNode{Operator: "**", Left: &ast.IntegerNode{Value: 2}, Right: &ast.IntegerNode{Value: 4}}, Right: &ast.IntegerNode{Value: 1}},
},
{
"foo(bar())",
&ast.FunctionNode{Name: "foo", Arguments: []ast.Node{&ast.FunctionNode{Name: "bar", Arguments: []ast.Node{}}}},
},
{
`foo("arg1", 2, true)`,
&ast.FunctionNode{Name: "foo", Arguments: []ast.Node{&ast.StringNode{Value: "arg1"}, &ast.IntegerNode{Value: 2}, &ast.BoolNode{Value: true}}},
},
{
"foo.bar",
&ast.PropertyNode{Node: &ast.IdentifierNode{Value: "foo"}, Property: "bar"},
},
{
"foo?.bar",
&ast.PropertyNode{Node: &ast.IdentifierNode{Value: "foo", NilSafe: true}, Property: "bar", NilSafe: true},
},
{
"foo['all']",
&ast.IndexNode{Node: &ast.IdentifierNode{Value: "foo"}, Index: &ast.StringNode{Value: "all"}},
},
{
"foo.bar()",
&ast.MethodNode{Node: &ast.IdentifierNode{Value: "foo"}, Method: "bar", Arguments: []ast.Node{}},
},
{
`foo.bar("arg1", 2, true)`,
&ast.MethodNode{Node: &ast.IdentifierNode{Value: "foo"}, Method: "bar", Arguments: []ast.Node{&ast.StringNode{Value: "arg1"}, &ast.IntegerNode{Value: 2}, &ast.BoolNode{Value: true}}},
},
{
"foo[3]",
&ast.IndexNode{Node: &ast.IdentifierNode{Value: "foo"}, Index: &ast.IntegerNode{Value: 3}},
},
{
"true ? true : false",
&ast.ConditionalNode{Cond: &ast.BoolNode{Value: true}, Exp1: &ast.BoolNode{Value: true}, Exp2: &ast.BoolNode{}},
},
{
"foo.bar().foo().baz[33]",
&ast.IndexNode{
Node: &ast.PropertyNode{Node: &ast.MethodNode{Node: &ast.MethodNode{
Node: &ast.IdentifierNode{Value: "foo"}, Method: "bar", Arguments: []ast.Node{},
}, Method: "foo", Arguments: []ast.Node{}}, Property: "baz"},
Index: &ast.IntegerNode{Value: 33},
},
},
{
"'a' == 'b'",
&ast.BinaryNode{Operator: "==", Left: &ast.StringNode{Value: "a"}, Right: &ast.StringNode{Value: "b"}},
},
{
"+0 != -0",
&ast.BinaryNode{Operator: "!=", Left: &ast.UnaryNode{Operator: "+", Node: &ast.IntegerNode{}}, Right: &ast.UnaryNode{Operator: "-", Node: &ast.IntegerNode{}}},
},
{
"[a, b, c]",
&ast.ArrayNode{Nodes: []ast.Node{&ast.IdentifierNode{Value: "a"}, &ast.IdentifierNode{Value: "b"}, &ast.IdentifierNode{Value: "c"}}},
},
{
"{foo:1, bar:2}",
&ast.MapNode{Pairs: []ast.Node{&ast.PairNode{Key: &ast.StringNode{Value: "foo"}, Value: &ast.IntegerNode{Value: 1}}, &ast.PairNode{Key: &ast.StringNode{Value: "bar"}, Value: &ast.IntegerNode{Value: 2}}}},
},
{
"{foo:1, bar:2, }",
&ast.MapNode{Pairs: []ast.Node{&ast.PairNode{Key: &ast.StringNode{Value: "foo"}, Value: &ast.IntegerNode{Value: 1}}, &ast.PairNode{Key: &ast.StringNode{Value: "bar"}, Value: &ast.IntegerNode{Value: 2}}}},
},
{
`{"a": 1, 'b': 2}`,
&ast.MapNode{Pairs: []ast.Node{&ast.PairNode{Key: &ast.StringNode{Value: "a"}, Value: &ast.IntegerNode{Value: 1}}, &ast.PairNode{Key: &ast.StringNode{Value: "b"}, Value: &ast.IntegerNode{Value: 2}}}},
},
{
"[1].foo",
&ast.PropertyNode{Node: &ast.ArrayNode{Nodes: []ast.Node{&ast.IntegerNode{Value: 1}}}, Property: "foo"},
},
{
"{foo:1}.bar",
&ast.PropertyNode{Node: &ast.MapNode{Pairs: []ast.Node{&ast.PairNode{Key: &ast.StringNode{Value: "foo"}, Value: &ast.IntegerNode{Value: 1}}}}, Property: "bar"},
},
{
"len(foo)",
&ast.BuiltinNode{Name: "len", Arguments: []ast.Node{&ast.IdentifierNode{Value: "foo"}}},
},
{
`foo matches "foo"`,
&ast.MatchesNode{Left: &ast.IdentifierNode{Value: "foo"}, Right: &ast.StringNode{Value: "foo"}},
},
{
`foo matches regex`,
&ast.MatchesNode{Left: &ast.IdentifierNode{Value: "foo"}, Right: &ast.IdentifierNode{Value: "regex"}},
},
{
`foo contains "foo"`,
&ast.BinaryNode{Operator: "contains", Left: &ast.IdentifierNode{Value: "foo"}, Right: &ast.StringNode{Value: "foo"}},
},
{
`foo startsWith "foo"`,
&ast.BinaryNode{Operator: "startsWith", Left: &ast.IdentifierNode{Value: "foo"}, Right: &ast.StringNode{Value: "foo"}},
},
{
`foo endsWith "foo"`,
&ast.BinaryNode{Operator: "endsWith", Left: &ast.IdentifierNode{Value: "foo"}, Right: &ast.StringNode{Value: "foo"}},
},
{
"1..9",
&ast.BinaryNode{Operator: "..", Left: &ast.IntegerNode{Value: 1}, Right: &ast.IntegerNode{Value: 9}},
},
{
"0 in []",
&ast.BinaryNode{Operator: "in", Left: &ast.IntegerNode{}, Right: &ast.ArrayNode{Nodes: []ast.Node{}}},
},
{
"not in_var",
&ast.UnaryNode{Operator: "not", Node: &ast.IdentifierNode{Value: "in_var"}},
},
{
"all(Tickets, {.Price > 0})",
&ast.BuiltinNode{Name: "all", Arguments: []ast.Node{&ast.IdentifierNode{Value: "Tickets"}, &ast.ClosureNode{Node: &ast.BinaryNode{Operator: ">", Left: &ast.PropertyNode{Node: &ast.PointerNode{}, Property: "Price"}, Right: &ast.IntegerNode{Value: 0}}}}},
},
{
"one(Tickets, {#.Price > 0})",
&ast.BuiltinNode{Name: "one", Arguments: []ast.Node{&ast.IdentifierNode{Value: "Tickets"}, &ast.ClosureNode{Node: &ast.BinaryNode{Operator: ">", Left: &ast.PropertyNode{Node: &ast.PointerNode{}, Property: "Price"}, Right: &ast.IntegerNode{Value: 0}}}}},
},
{
"filter(Prices, {# > 100})",
&ast.BuiltinNode{Name: "filter", Arguments: []ast.Node{&ast.IdentifierNode{Value: "Prices"}, &ast.ClosureNode{Node: &ast.BinaryNode{Operator: ">", Left: &ast.PointerNode{}, Right: &ast.IntegerNode{Value: 100}}}}},
},
{
"array[1:2]",
&ast.SliceNode{Node: &ast.IdentifierNode{Value: "array"}, From: &ast.IntegerNode{Value: 1}, To: &ast.IntegerNode{Value: 2}},
},
{
"array[:2]",
&ast.SliceNode{Node: &ast.IdentifierNode{Value: "array"}, To: &ast.IntegerNode{Value: 2}},
},
{
"array[1:]",
&ast.SliceNode{Node: &ast.IdentifierNode{Value: "array"}, From: &ast.IntegerNode{Value: 1}},
},
{
"array[:]",
&ast.SliceNode{Node: &ast.IdentifierNode{Value: "array"}},
},
{
"[]",
&ast.ArrayNode{},
},
{
"[1, 2, 3,]",
&ast.ArrayNode{Nodes: []ast.Node{&ast.IntegerNode{Value: 1}, &ast.IntegerNode{Value: 2}, &ast.IntegerNode{Value: 3}}},
},
}
for _, test := range parseTests {
actual, err := parser.Parse(test.input)
if err != nil {
t.Errorf("%s:\n%v", test.input, err)
continue
}
if m, ok := (actual.Node).(*ast.MatchesNode); ok {
m.Regexp = nil
actual.Node = m
}
assert.Equal(t, ast.Dump(test.expected), ast.Dump(actual.Node), test.input)
}
}
const errorTests = `
foo.
unexpected end of expression (1:4)
| foo.
| ...^
a+
unexpected token EOF (1:2)
| a+
| .^
a ? (1+2) c
unexpected token Identifier("c") (1:11)
| a ? (1+2) c
| ..........^
[a b]
unexpected token Identifier("b") (1:4)
| [a b]
| ...^
foo.bar(a b)
unexpected token Identifier("b") (1:11)
| foo.bar(a b)
| ..........^
{-}
a map key must be a quoted string, a number, a identifier, or an expression enclosed in parentheses (unexpected token Operator("-")) (1:2)
| {-}
| .^
a matches 'a:)b'
error parsing regexp: unexpected ): ` + "`a:)b`" + ` (1:16)
| a matches 'a:)b'
| ...............^
foo({.bar})
a map key must be a quoted string, a number, a identifier, or an expression enclosed in parentheses (unexpected token Operator(".")) (1:6)
| foo({.bar})
| .....^
.foo
cannot use pointer accessor outside closure (1:1)
| .foo
| ^
[1, 2, 3,,]
unexpected token Operator(",") (1:10)
| [1, 2, 3,,]
| .........^
[,]
unexpected token Operator(",") (1:2)
| [,]
| .^
{,}
a map key must be a quoted string, a number, a identifier, or an expression enclosed in parentheses (unexpected token Operator(",")) (1:2)
| {,}
| .^
{foo:1, bar:2, ,}
unexpected token Operator(",") (1:16)
| {foo:1, bar:2, ,}
| ...............^
`
func TestParse_error(t *testing.T) {
tests := strings.Split(strings.Trim(errorTests, "\n"), "\n\n")
for _, test := range tests {
input := strings.SplitN(test, "\n", 2)
if len(input) != 2 {
t.Errorf("syntax error in test: %q", test)
break
}
_, err := parser.Parse(input[0])
if err == nil {
err = fmt.Errorf("<nil>")
}
assert.Equal(t, input[1], err.Error(), input[0])
}
}
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