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|
package json
import (
"fmt"
"io"
"testing"
"github.com/tdewolff/parse/v2"
"github.com/tdewolff/test"
)
type GTs []GrammarType
func TestGrammars(t *testing.T) {
var grammarTests = []struct {
json string
expected []GrammarType
}{
{" \t\n\r", GTs{}}, // WhitespaceGrammar
{"null", GTs{LiteralGrammar}},
{"[]", GTs{StartArrayGrammar, EndArrayGrammar}},
{"15.2", GTs{NumberGrammar}},
{"0.4", GTs{NumberGrammar}},
{"5e9", GTs{NumberGrammar}},
{"-4E-3", GTs{NumberGrammar}},
{"true", GTs{LiteralGrammar}},
{"false", GTs{LiteralGrammar}},
{"null", GTs{LiteralGrammar}},
{`""`, GTs{StringGrammar}},
{`"abc"`, GTs{StringGrammar}},
{`"\""`, GTs{StringGrammar}},
{`"\\"`, GTs{StringGrammar}},
{"{}", GTs{StartObjectGrammar, EndObjectGrammar}},
{`{"a": "b", "c": "d"}`, GTs{StartObjectGrammar, StringGrammar, StringGrammar, StringGrammar, StringGrammar, EndObjectGrammar}},
{`{"a": [1, 2], "b": {"c": 3}}`, GTs{StartObjectGrammar, StringGrammar, StartArrayGrammar, NumberGrammar, NumberGrammar, EndArrayGrammar, StringGrammar, StartObjectGrammar, StringGrammar, NumberGrammar, EndObjectGrammar, EndObjectGrammar}},
{"[null,]", GTs{StartArrayGrammar, LiteralGrammar, EndArrayGrammar}},
}
for _, tt := range grammarTests {
t.Run(tt.json, func(t *testing.T) {
p := NewParser(parse.NewInputString(tt.json))
i := 0
for {
grammar, _ := p.Next()
if grammar == ErrorGrammar {
test.T(t, p.Err(), io.EOF)
test.T(t, i, len(tt.expected), "when error occurred we must be at the end")
break
} else if grammar == WhitespaceGrammar {
continue
}
test.That(t, i < len(tt.expected), "index", i, "must not exceed expected grammar types size", len(tt.expected))
if i < len(tt.expected) {
test.T(t, grammar, tt.expected[i], "grammar types must match")
}
i++
}
})
}
// coverage
for i := 0; ; i++ {
if GrammarType(i).String() == fmt.Sprintf("Invalid(%d)", i) {
break
}
}
for i := 0; ; i++ {
if State(i).String() == fmt.Sprintf("Invalid(%d)", i) {
break
}
}
}
func TestGrammarsErrorEOF(t *testing.T) {
var grammarErrorTests = []struct {
json string
}{
{`{"":"`},
{"\"a\\"},
}
for _, tt := range grammarErrorTests {
t.Run(tt.json, func(t *testing.T) {
p := NewParser(parse.NewInputString(tt.json))
for {
grammar, _ := p.Next()
if grammar == ErrorGrammar {
test.T(t, p.Err(), io.EOF)
break
}
}
})
}
}
func TestGrammarsError(t *testing.T) {
var grammarErrorTests = []struct {
json string
col int
}{
{"true, false", 5},
{"[true false]", 7},
{"]", 1},
{"}", 1},
{"{0: 1}", 2},
{"{\"a\" 1}", 6},
{"1.", 2},
{"1e+", 2},
{"[true, \x00]", 8},
{"\"string\x00\"", 8},
{"{\"id\": noquote}", 8},
{"{\"id\"\x00: 5}", 6},
{"{\"id: \x00}", 7},
{"{\"id: 5\x00", 8},
}
for _, tt := range grammarErrorTests {
t.Run(tt.json, func(t *testing.T) {
p := NewParser(parse.NewInputString(tt.json))
for {
grammar, _ := p.Next()
if grammar == ErrorGrammar {
if perr, ok := p.Err().(*parse.Error); ok {
_, col, _ := perr.Position()
test.T(t, col, tt.col)
} else {
test.Fail(t, "not a parse error:", p.Err())
}
break
}
}
})
}
}
func TestStates(t *testing.T) {
var stateTests = []struct {
json string
expected []State
}{
{"null", []State{ValueState}},
{"[null]", []State{ArrayState, ArrayState, ValueState}},
{"{\"\":null}", []State{ObjectKeyState, ObjectValueState, ObjectKeyState, ValueState}},
}
for _, tt := range stateTests {
t.Run(tt.json, func(t *testing.T) {
p := NewParser(parse.NewInputString(tt.json))
i := 0
for {
grammar, _ := p.Next()
state := p.State()
if grammar == ErrorGrammar {
test.T(t, p.Err(), io.EOF)
test.T(t, i, len(tt.expected), "when error occurred we must be at the end")
break
} else if grammar == WhitespaceGrammar {
continue
}
test.That(t, i < len(tt.expected), "index", i, "must not exceed expected states size", len(tt.expected))
if i < len(tt.expected) {
test.T(t, state, tt.expected[i], "states must match")
}
i++
}
})
}
}
func TestOffset(t *testing.T) {
z := parse.NewInputString(`{"key": [5, "string", null, true]}`)
p := NewParser(z)
test.T(t, z.Offset(), 0)
_, _ = p.Next()
test.T(t, z.Offset(), 1) // {
_, _ = p.Next()
test.T(t, z.Offset(), 7) // "key":
_, _ = p.Next()
test.T(t, z.Offset(), 9) // [
_, _ = p.Next()
test.T(t, z.Offset(), 10) // 5
_, _ = p.Next()
test.T(t, z.Offset(), 20) // , "string"
_, _ = p.Next()
test.T(t, z.Offset(), 26) // , null
_, _ = p.Next()
test.T(t, z.Offset(), 32) // , true
_, _ = p.Next()
test.T(t, z.Offset(), 33) // ]
_, _ = p.Next()
test.T(t, z.Offset(), 34) // }
}
////////////////////////////////////////////////////////////////
func ExampleNewParser() {
p := NewParser(parse.NewInputString(`{"key": 5}`))
out := ""
for {
state := p.State()
gt, data := p.Next()
if gt == ErrorGrammar {
break
}
out += string(data)
if state == ObjectKeyState && gt != EndObjectGrammar {
out += ":"
}
// not handling comma insertion
}
fmt.Println(out)
// Output: {"key":5}
}
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