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|
package tuigen
import (
"testing"
)
func TestParser_LetBinding(t *testing.T) {
input := `package x
templ Test() {
myText := <span>Hello</span>
<div></div>
}`
l := NewLexer("test.gsx", input)
p := NewParser(l)
file, err := p.ParseFile()
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
comp := file.Components[0]
if len(comp.Body) != 2 {
t.Fatalf("expected 2 body nodes, got %d", len(comp.Body))
}
let, ok := comp.Body[0].(*LetBinding)
if !ok {
t.Fatalf("expected *LetBinding, got %T", comp.Body[0])
}
if let.Name != "myText" {
t.Errorf("Name = %q, want 'myText'", let.Name)
}
if let.Element == nil {
t.Fatal("Element is nil")
}
if let.Element.Tag != "span" {
t.Errorf("Element.Tag = %q, want 'span'", let.Element.Tag)
}
}
func TestParser_ForLoop(t *testing.T) {
type tc struct {
input string
wantIndex string
wantValue string
wantIter string
}
tests := map[string]tc{
"index and value": {
input: `package x
templ Test() {
for i, item := range items {
<span>Hello</span>
}
}`,
wantIndex: "i",
wantValue: "item",
wantIter: "items",
},
"underscore index": {
input: `package x
templ Test() {
for _, item := range items {
<span>Hello</span>
}
}`,
wantIndex: "_",
wantValue: "item",
wantIter: "items",
},
"value only": {
input: `package x
templ Test() {
for item := range items {
<span>Hello</span>
}
}`,
wantIndex: "",
wantValue: "item",
wantIter: "items",
},
}
for name, tt := range tests {
t.Run(name, func(t *testing.T) {
l := NewLexer("test.gsx", tt.input)
p := NewParser(l)
file, err := p.ParseFile()
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
forLoop, ok := file.Components[0].Body[0].(*ForLoop)
if !ok {
t.Fatalf("expected *ForLoop, got %T", file.Components[0].Body[0])
}
if forLoop.Index != tt.wantIndex {
t.Errorf("Index = %q, want %q", forLoop.Index, tt.wantIndex)
}
if forLoop.Value != tt.wantValue {
t.Errorf("Value = %q, want %q", forLoop.Value, tt.wantValue)
}
if forLoop.Iterable != tt.wantIter {
t.Errorf("Iterable = %q, want %q", forLoop.Iterable, tt.wantIter)
}
if len(forLoop.Body) != 1 {
t.Errorf("len(Body) = %d, want 1", len(forLoop.Body))
}
})
}
}
func TestParser_IfStatement(t *testing.T) {
type tc struct {
input string
wantCondition string
wantElse bool
}
tests := map[string]tc{
"simple if": {
input: `package x
templ Test() {
if showHeader {
<span>Header</span>
}
}`,
wantCondition: "showHeader",
wantElse: false,
},
"if with else": {
input: `package x
templ Test() {
if isLoading {
<span>Loading</span>
} else {
<span>Done</span>
}
}`,
wantCondition: "isLoading",
wantElse: true,
},
"complex condition": {
input: `package x
templ Test() {
if err != nil {
<span>Error</span>
}
}`,
wantCondition: "err != nil",
wantElse: false,
},
}
for name, tt := range tests {
t.Run(name, func(t *testing.T) {
l := NewLexer("test.gsx", tt.input)
p := NewParser(l)
file, err := p.ParseFile()
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
ifStmt, ok := file.Components[0].Body[0].(*IfStmt)
if !ok {
t.Fatalf("expected *IfStmt, got %T", file.Components[0].Body[0])
}
if ifStmt.Condition != tt.wantCondition {
t.Errorf("Condition = %q, want %q", ifStmt.Condition, tt.wantCondition)
}
if len(ifStmt.Then) != 1 {
t.Errorf("len(Then) = %d, want 1", len(ifStmt.Then))
}
hasElse := len(ifStmt.Else) > 0
if hasElse != tt.wantElse {
t.Errorf("hasElse = %v, want %v", hasElse, tt.wantElse)
}
})
}
}
func TestParser_IfElseIf(t *testing.T) {
input := `package x
templ Test() {
if a {
<span>A</span>
} else if b {
<span>B</span>
} else {
<span>C</span>
}
}`
l := NewLexer("test.gsx", input)
p := NewParser(l)
file, err := p.ParseFile()
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
ifStmt, ok := file.Components[0].Body[0].(*IfStmt)
if !ok {
t.Fatalf("expected *IfStmt, got %T", file.Components[0].Body[0])
}
if ifStmt.Condition != "a" {
t.Errorf("Condition = %q, want 'a'", ifStmt.Condition)
}
if len(ifStmt.Else) != 1 {
t.Fatalf("len(Else) = %d, want 1", len(ifStmt.Else))
}
elseIf, ok := ifStmt.Else[0].(*IfStmt)
if !ok {
t.Fatalf("Else[0] expected *IfStmt, got %T", ifStmt.Else[0])
}
if elseIf.Condition != "b" {
t.Errorf("elseIf.Condition = %q, want 'b'", elseIf.Condition)
}
if len(elseIf.Else) != 1 {
t.Fatalf("len(elseIf.Else) = %d, want 1", len(elseIf.Else))
}
}
func TestParser_ControlFlowInChildren(t *testing.T) {
input := `package x
templ Test(items []string) {
<div>
for _, item := range items {
<span>{item}</span>
}
if len(items) == 0 {
<span>No items</span>
}
</div>
}`
l := NewLexer("test.gsx", input)
p := NewParser(l)
file, err := p.ParseFile()
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
box := file.Components[0].Body[0].(*Element)
hasFor := false
hasIf := false
for _, child := range box.Children {
switch child.(type) {
case *ForLoop:
hasFor = true
case *IfStmt:
hasIf = true
}
}
if !hasFor {
t.Error("expected ForLoop child")
}
if !hasIf {
t.Error("expected IfStmt child")
}
}
func TestParser_RawGoStatements(t *testing.T) {
type tc struct {
input string
wantCodes []string
}
tests := map[string]tc{
"simple assignment": {
input: `package x
templ Test() {
x := 1
<span>{x}</span>
}`,
wantCodes: []string{"x := 1"},
},
"function call": {
input: `package x
templ Test() {
fmt.Println("hello")
<span>world</span>
}`,
wantCodes: []string{`fmt.Println("hello")`},
},
"multi-line statement": {
input: `package x
templ Test() {
result := compute(
arg1,
arg2,
)
<span>{result}</span>
}`,
wantCodes: []string{"result := compute(\n\t\targ1,\n\t\targ2,\n\t)"},
},
"multiple statements": {
input: `package x
templ Test() {
x := 1
y := 2
z := x + y
<span>{z}</span>
}`,
wantCodes: []string{"x := 1", "y := 2", "z := x + y"},
},
"typed var declaration": {
input: `package x
templ Test() {
var count int = 0
<span>{count}</span>
}`,
wantCodes: []string{"var count int = 0"},
},
"var without initializer": {
input: `package x
templ Test() {
var err error
<span>{err}</span>
}`,
wantCodes: []string{"var err error"},
},
"defer statement": {
input: `package x
templ Test() {
defer cleanup()
<span>running</span>
}`,
wantCodes: []string{"defer cleanup()"},
},
"go statement": {
input: `package x
templ Test() {
go doWork()
<span>spawned</span>
}`,
wantCodes: []string{"go doWork()"},
},
"for loop statement": {
input: `package x
templ Test() {
for i := 0; i < 10; i++ { sum += i }
<span>{sum}</span>
}`,
wantCodes: []string{"for i := 0; i < 10; i++ { sum += i }"},
},
"switch statement": {
input: `package x
templ Test(x int) {
switch x { case 1: y = "one"; case 2: y = "two" }
<span>{y}</span>
}`,
wantCodes: []string{`switch x { case 1: y = "one"; case 2: y = "two" }`},
},
}
for name, tt := range tests {
t.Run(name, func(t *testing.T) {
l := NewLexer("test.gsx", tt.input)
p := NewParser(l)
file, err := p.ParseFile()
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
if len(file.Components) != 1 {
t.Fatalf("expected 1 component, got %d", len(file.Components))
}
body := file.Components[0].Body
var goCodes []*GoCode
for _, node := range body {
if gc, ok := node.(*GoCode); ok {
goCodes = append(goCodes, gc)
}
}
if len(goCodes) != len(tt.wantCodes) {
t.Fatalf("expected %d GoCode nodes, got %d", len(tt.wantCodes), len(goCodes))
}
for i, wantCode := range tt.wantCodes {
if goCodes[i].Code != wantCode {
t.Errorf("GoCode[%d].Code = %q, want %q", i, goCodes[i].Code, wantCode)
}
}
})
}
}
func TestParser_GoStatementStopsAtClosingBrace(t *testing.T) {
input := `package x
templ Test() {
if condition {
log.Error(err)
}
}`
l := NewLexer("test.gsx", input)
p := NewParser(l)
file, err := p.ParseFile()
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
ifStmt, ok := file.Components[0].Body[0].(*IfStmt)
if !ok {
t.Fatalf("expected *IfStmt, got %T", file.Components[0].Body[0])
}
if len(ifStmt.Then) != 1 {
t.Fatalf("expected 1 then node, got %d", len(ifStmt.Then))
}
gc, ok := ifStmt.Then[0].(*GoCode)
if !ok {
t.Fatalf("expected *GoCode, got %T", ifStmt.Then[0])
}
if gc.Code != "log.Error(err)" {
t.Errorf("Code = %q, want %q", gc.Code, "log.Error(err)")
}
}
func TestParser_GoStatementMultilineBraces(t *testing.T) {
input := `package x
templ Test(x int) {
switch x { case 1: y = "one"; case 2: y = "two" }
<span>{y}</span>
}`
l := NewLexer("test.gsx", input)
p := NewParser(l)
file, err := p.ParseFile()
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
gc, ok := file.Components[0].Body[0].(*GoCode)
if !ok {
t.Fatalf("expected *GoCode, got %T", file.Components[0].Body[0])
}
want := `switch x { case 1: y = "one"; case 2: y = "two" }`
if gc.Code != want {
t.Errorf("Code = %q, want %q", gc.Code, want)
}
}
func TestParser_ShortBinding(t *testing.T) {
type tc struct {
input string
wantName string
wantElement string
wantCall string
wantShort bool
}
tests := map[string]tc{
"short element binding": {
input: "package x\ntempl Test() {\n\tlabel := <span>Hello</span>\n\t<div></div>\n}",
wantName: "label",
wantElement: "span",
wantShort: true,
},
"short component binding": {
input: "package x\ntempl Test() {\n\tfoo := @MyComponent()\n\t<div></div>\n}",
wantName: "foo",
wantCall: "MyComponent",
wantShort: true,
},
"var element binding": {
input: "package x\ntempl Test() {\n\tvar label = <span>Hello</span>\n\t<div></div>\n}",
wantName: "label",
wantElement: "span",
wantShort: false,
},
"var component binding": {
input: "package x\ntempl Test() {\n\tvar foo = @MyComponent()\n\t<div></div>\n}",
wantName: "foo",
wantCall: "MyComponent",
wantShort: false,
},
}
for name, tt := range tests {
t.Run(name, func(t *testing.T) {
l := NewLexer("test.gsx", tt.input)
p := NewParser(l)
file, err := p.ParseFile()
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
let, ok := file.Components[0].Body[0].(*LetBinding)
if !ok {
t.Fatalf("expected *LetBinding, got %T", file.Components[0].Body[0])
}
if let.Name != tt.wantName {
t.Errorf("Name = %q, want %q", let.Name, tt.wantName)
}
if let.IsShortForm != tt.wantShort {
t.Errorf("IsShortForm = %v, want %v", let.IsShortForm, tt.wantShort)
}
if tt.wantElement != "" {
if let.Element == nil {
t.Fatal("Element is nil")
}
if let.Element.Tag != tt.wantElement {
t.Errorf("Element.Tag = %q, want %q", let.Element.Tag, tt.wantElement)
}
}
if tt.wantCall != "" {
if let.Call == nil {
t.Fatal("Call is nil")
}
if let.Call.Name != tt.wantCall {
t.Errorf("Call.Name = %q, want %q", let.Call.Name, tt.wantCall)
}
}
})
}
}
func TestParser_BareIfStatement(t *testing.T) {
input := `package x
templ Test() {
if showHeader {
<span>Header</span>
}
}`
l := NewLexer("test.gsx", input)
p := NewParser(l)
file, err := p.ParseFile()
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
ifStmt, ok := file.Components[0].Body[0].(*IfStmt)
if !ok {
t.Fatalf("expected *IfStmt, got %T", file.Components[0].Body[0])
}
if ifStmt.Condition != "showHeader" {
t.Errorf("Condition = %q, want 'showHeader'", ifStmt.Condition)
}
}
func TestParser_BareElseIf(t *testing.T) {
input := `package x
templ Test() {
if a {
<span>A</span>
} else if b {
<span>B</span>
} else {
<span>C</span>
}
}`
l := NewLexer("test.gsx", input)
p := NewParser(l)
file, err := p.ParseFile()
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
ifStmt, ok := file.Components[0].Body[0].(*IfStmt)
if !ok {
t.Fatalf("expected *IfStmt, got %T", file.Components[0].Body[0])
}
if ifStmt.Condition != "a" {
t.Errorf("Condition = %q, want 'a'", ifStmt.Condition)
}
if len(ifStmt.Else) != 1 {
t.Fatalf("len(Else) = %d, want 1", len(ifStmt.Else))
}
elseIf, ok := ifStmt.Else[0].(*IfStmt)
if !ok {
t.Fatalf("Else[0] expected *IfStmt, got %T", ifStmt.Else[0])
}
if elseIf.Condition != "b" {
t.Errorf("elseIf.Condition = %q, want 'b'", elseIf.Condition)
}
if len(elseIf.Else) != 1 {
t.Fatalf("len(elseIf.Else) = %d, want 1", len(elseIf.Else))
}
}
func TestParser_BareForLoop(t *testing.T) {
input := `package x
templ Test() {
for i, item := range items {
<span>{item}</span>
}
}`
l := NewLexer("test.gsx", input)
p := NewParser(l)
file, err := p.ParseFile()
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
forLoop, ok := file.Components[0].Body[0].(*ForLoop)
if !ok {
t.Fatalf("expected *ForLoop, got %T", file.Components[0].Body[0])
}
if forLoop.Index != "i" {
t.Errorf("Index = %q, want 'i'", forLoop.Index)
}
if forLoop.Value != "item" {
t.Errorf("Value = %q, want 'item'", forLoop.Value)
}
if forLoop.Iterable != "items" {
t.Errorf("Iterable = %q, want 'items'", forLoop.Iterable)
}
}
func TestParser_CStyleForLoopStaysGoCode(t *testing.T) {
input := `package x
templ Test() {
for i := 0; i < 10; i++ { sum += i }
<span>{sum}</span>
}`
l := NewLexer("test.gsx", input)
p := NewParser(l)
file, err := p.ParseFile()
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
gc, ok := file.Components[0].Body[0].(*GoCode)
if !ok {
t.Fatalf("expected *GoCode for C-style for loop, got %T", file.Components[0].Body[0])
}
if gc.Code != "for i := 0; i < 10; i++ { sum += i }" {
t.Errorf("Code = %q", gc.Code)
}
}
func TestParser_ShortBindingGoExprStaysGoCode(t *testing.T) {
input := `package x
templ Test() {
formatted := fmt.Sprintf("%d", count)
<span>{formatted}</span>
}`
l := NewLexer("test.gsx", input)
p := NewParser(l)
file, err := p.ParseFile()
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
gc, ok := file.Components[0].Body[0].(*GoCode)
if !ok {
t.Fatalf("expected *GoCode for Go expression, got %T", file.Components[0].Body[0])
}
_ = gc
}
func TestParser_RawGoStatementsWithElements(t *testing.T) {
input := `package x
templ Counter(count int) {
formattedCount := fmt.Sprintf("%d", count)
log.Printf("Rendering counter")
<div>
<span>{formattedCount}</span>
</div>
}`
l := NewLexer("test.gsx", input)
p := NewParser(l)
file, err := p.ParseFile()
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
body := file.Components[0].Body
if len(body) != 3 {
t.Fatalf("expected 3 body nodes, got %d", len(body))
}
gc1, ok := body[0].(*GoCode)
if !ok {
t.Fatalf("body[0]: expected *GoCode, got %T", body[0])
}
if gc1.Code != `formattedCount := fmt.Sprintf("%d", count)` {
t.Errorf("body[0].Code = %q", gc1.Code)
}
gc2, ok := body[1].(*GoCode)
if !ok {
t.Fatalf("body[1]: expected *GoCode, got %T", body[1])
}
if gc2.Code != `log.Printf("Rendering counter")` {
t.Errorf("body[1].Code = %q", gc2.Code)
}
elem, ok := body[2].(*Element)
if !ok {
t.Fatalf("body[2]: expected *Element, got %T", body[2])
}
if elem.Tag != "div" {
t.Errorf("body[2].Tag = %q, want 'div'", elem.Tag)
}
}
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