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lexer_test.go
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package main
import "testing"
func TestLexer(t *testing.T) {
tests := []struct {
name string
input string
expected []Token
}{
{
name: "Empty Input",
input: "",
expected: []Token{{Type: EOF, Literal: ""}},
},
{
name: "String",
input: `"hello"`,
expected: []Token{{Type: String, Literal: "hello"}},
},
{
name: "Number",
input: `42`,
expected: []Token{{Type: Number, Literal: "42"}},
},
{
name: "Boolean",
input: `true`,
expected: []Token{{Type: True, Literal: "true"}},
},
{
name: "Empty Object",
input: "{}",
expected: []Token{{Type: BeginObject, Literal: "{"}, {Type: EndObject, Literal: "}"}, {Type: EOF, Literal: ""}},
},
{
name: "Empty Array",
input: "[]",
expected: []Token{{Type: BeginArray, Literal: "["}, {Type: EndArray, Literal: "]"}, {Type: EOF, Literal: ""}},
},
{
name: "Object with String Value",
input: `{ "key": "value" }`,
expected: []Token{
{Type: BeginObject, Literal: "{"},
{Type: String, Literal: "key"},
{Type: NameSeparator, Literal: ":"},
{Type: String, Literal: "value"},
{Type: EndObject, Literal: "}"},
{Type: EOF, Literal: ""},
},
},
{
name: "Object with Number Value (Carriage Returns)",
input: `{\r"key": 42\r}`,
expected: []Token{
{Type: BeginObject, Literal: "{"},
{Type: String, Literal: "key"},
{Type: NameSeparator, Literal: ":"},
{Type: Number, Literal: "42"},
{Type: EndObject, Literal: "}"},
{Type: EOF, Literal: ""},
},
},
{
name: "Object with Boolean Value (New Line Characters)",
input: `{\n"a": true,\n"b": false,\n"c": null\n}`,
expected: []Token{
{Type: BeginObject, Literal: "{"},
{Type: String, Literal: "a"},
{Type: NameSeparator, Literal: ":"},
{Type: True, Literal: "true"},
{Type: ValueSeparator, Literal: ","},
{Type: String, Literal: "b"},
{Type: NameSeparator, Literal: ":"},
{Type: False, Literal: "false"},
{Type: ValueSeparator, Literal: ","},
{Type: String, Literal: "c"},
{Type: NameSeparator, Literal: ":"},
{Type: Null, Literal: "null"},
{Type: EndObject, Literal: "}"},
{Type: EOF, Literal: ""},
},
},
{
name: "Object with Boolean, Null, and Number Values (Decimal and Negative)",
input: `{ "key1": true, "key2": false, "key3": null, "key4": "value", "key5": 101.2, "key6": -42 }`,
expected: []Token{
{Type: BeginObject, Literal: "{"},
{Type: String, Literal: "key1"},
{Type: NameSeparator, Literal: ":"},
{Type: True, Literal: "true"},
{Type: ValueSeparator, Literal: ","},
{Type: String, Literal: "key2"},
{Type: NameSeparator, Literal: ":"},
{Type: False, Literal: "false"},
{Type: ValueSeparator, Literal: ","},
{Type: String, Literal: "key3"},
{Type: NameSeparator, Literal: ":"},
{Type: Null, Literal: "null"},
{Type: ValueSeparator, Literal: ","},
{Type: String, Literal: "key4"},
{Type: NameSeparator, Literal: ":"},
{Type: String, Literal: "value"},
{Type: ValueSeparator, Literal: ","},
{Type: String, Literal: "key5"},
{Type: NameSeparator, Literal: ":"},
{Type: Number, Literal: "101.2"},
{Type: ValueSeparator, Literal: ","},
{Type: String, Literal: "key6"},
{Type: NameSeparator, Literal: ":"},
{Type: Number, Literal: "-42"},
{Type: EndObject, Literal: "}"},
{Type: EOF, Literal: ""},
},
},
{
name: "Object with Empty Nested Object and Array Values",
input: `{ "key": "value", "key-n": 101, "key-o": {}, "key-l": [] }`,
expected: []Token{
{Type: BeginObject, Literal: "{"},
{Type: String, Literal: "key"},
{Type: NameSeparator, Literal: ":"},
{Type: String, Literal: "value"},
{Type: ValueSeparator, Literal: ","},
{Type: String, Literal: "key-n"},
{Type: NameSeparator, Literal: ":"},
{Type: Number, Literal: "101"},
{Type: ValueSeparator, Literal: ","},
{Type: String, Literal: "key-o"},
{Type: NameSeparator, Literal: ":"},
{Type: BeginObject, Literal: "{"},
{Type: EndObject, Literal: "}"},
{Type: ValueSeparator, Literal: ","},
{Type: String, Literal: "key-l"},
{Type: NameSeparator, Literal: ":"},
{Type: BeginArray, Literal: "["},
{Type: EndArray, Literal: "]"},
{Type: EndObject, Literal: "}"},
{Type: EOF, Literal: ""},
},
},
{
name: "Object with Nested Object and Array Values",
input: `{ "key": "value", "key-n": 101, "key-o": { "inner key": "inner value" }, "key-l": [ "list value" ] }`,
expected: []Token{
{Type: BeginObject, Literal: "{"},
{Type: String, Literal: "key"},
{Type: NameSeparator, Literal: ":"},
{Type: String, Literal: "value"},
{Type: ValueSeparator, Literal: ","},
{Type: String, Literal: "key-n"},
{Type: NameSeparator, Literal: ":"},
{Type: Number, Literal: "101"},
{Type: ValueSeparator, Literal: ","},
{Type: String, Literal: "key-o"},
{Type: NameSeparator, Literal: ":"},
{Type: BeginObject, Literal: "{"},
{Type: String, Literal: "inner key"},
{Type: NameSeparator, Literal: ":"},
{Type: String, Literal: "inner value"},
{Type: EndObject, Literal: "}"},
{Type: ValueSeparator, Literal: ","},
{Type: String, Literal: "key-l"},
{Type: NameSeparator, Literal: ":"},
{Type: BeginArray, Literal: "["},
{Type: String, Literal: "list value"},
{Type: EndArray, Literal: "]"},
{Type: EndObject, Literal: "}"},
{Type: EOF, Literal: ""},
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
l := NewLexer(tt.input)
for _, expected := range tt.expected {
actual := l.NextToken()
if actual != expected {
t.Errorf("expected %v, got %v", expected, actual)
}
}
})
}
}