Source file src/text/template/multi_test.go

Documentation: text/template

     1  // Copyright 2011 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package template
     6  
     7  // Tests for multiple-template parsing and execution.
     8  
     9  import (
    10  	"fmt"
    11  	"os"
    12  	"strings"
    13  	"testing"
    14  	"text/template/parse"
    15  )
    16  
    17  const (
    18  	noError  = true
    19  	hasError = false
    20  )
    21  
    22  type multiParseTest struct {
    23  	name    string
    24  	input   string
    25  	ok      bool
    26  	names   []string
    27  	results []string
    28  }
    29  
    30  var multiParseTests = []multiParseTest{
    31  	{"empty", "", noError,
    32  		nil,
    33  		nil},
    34  	{"one", `{{define "foo"}} FOO {{end}}`, noError,
    35  		[]string{"foo"},
    36  		[]string{" FOO "}},
    37  	{"two", `{{define "foo"}} FOO {{end}}{{define "bar"}} BAR {{end}}`, noError,
    38  		[]string{"foo", "bar"},
    39  		[]string{" FOO ", " BAR "}},
    40  	// errors
    41  	{"missing end", `{{define "foo"}} FOO `, hasError,
    42  		nil,
    43  		nil},
    44  	{"malformed name", `{{define "foo}} FOO `, hasError,
    45  		nil,
    46  		nil},
    47  }
    48  
    49  func TestMultiParse(t *testing.T) {
    50  	for _, test := range multiParseTests {
    51  		template, err := New("root").Parse(test.input)
    52  		switch {
    53  		case err == nil && !test.ok:
    54  			t.Errorf("%q: expected error; got none", test.name)
    55  			continue
    56  		case err != nil && test.ok:
    57  			t.Errorf("%q: unexpected error: %v", test.name, err)
    58  			continue
    59  		case err != nil && !test.ok:
    60  			// expected error, got one
    61  			if *debug {
    62  				fmt.Printf("%s: %s\n\t%s\n", test.name, test.input, err)
    63  			}
    64  			continue
    65  		}
    66  		if template == nil {
    67  			continue
    68  		}
    69  		if len(template.tmpl) != len(test.names)+1 { // +1 for root
    70  			t.Errorf("%s: wrong number of templates; wanted %d got %d", test.name, len(test.names), len(template.tmpl))
    71  			continue
    72  		}
    73  		for i, name := range test.names {
    74  			tmpl, ok := template.tmpl[name]
    75  			if !ok {
    76  				t.Errorf("%s: can't find template %q", test.name, name)
    77  				continue
    78  			}
    79  			result := tmpl.Root.String()
    80  			if result != test.results[i] {
    81  				t.Errorf("%s=(%q): got\n\t%v\nexpected\n\t%v", test.name, test.input, result, test.results[i])
    82  			}
    83  		}
    84  	}
    85  }
    86  
    87  var multiExecTests = []execTest{
    88  	{"empty", "", "", nil, true},
    89  	{"text", "some text", "some text", nil, true},
    90  	{"invoke x", `{{template "x" .SI}}`, "TEXT", tVal, true},
    91  	{"invoke x no args", `{{template "x"}}`, "TEXT", tVal, true},
    92  	{"invoke dot int", `{{template "dot" .I}}`, "17", tVal, true},
    93  	{"invoke dot []int", `{{template "dot" .SI}}`, "[3 4 5]", tVal, true},
    94  	{"invoke dotV", `{{template "dotV" .U}}`, "v", tVal, true},
    95  	{"invoke nested int", `{{template "nested" .I}}`, "17", tVal, true},
    96  	{"variable declared by template", `{{template "nested" $x:=.SI}},{{index $x 1}}`, "[3 4 5],4", tVal, true},
    97  
    98  	// User-defined function: test argument evaluator.
    99  	{"testFunc literal", `{{oneArg "joe"}}`, "oneArg=joe", tVal, true},
   100  	{"testFunc .", `{{oneArg .}}`, "oneArg=joe", "joe", true},
   101  }
   102  
   103  // These strings are also in testdata/*.
   104  const multiText1 = `
   105  	{{define "x"}}TEXT{{end}}
   106  	{{define "dotV"}}{{.V}}{{end}}
   107  `
   108  
   109  const multiText2 = `
   110  	{{define "dot"}}{{.}}{{end}}
   111  	{{define "nested"}}{{template "dot" .}}{{end}}
   112  `
   113  
   114  func TestMultiExecute(t *testing.T) {
   115  	// Declare a couple of templates first.
   116  	template, err := New("root").Parse(multiText1)
   117  	if err != nil {
   118  		t.Fatalf("parse error for 1: %s", err)
   119  	}
   120  	_, err = template.Parse(multiText2)
   121  	if err != nil {
   122  		t.Fatalf("parse error for 2: %s", err)
   123  	}
   124  	testExecute(multiExecTests, template, t)
   125  }
   126  
   127  func TestParseFiles(t *testing.T) {
   128  	_, err := ParseFiles("DOES NOT EXIST")
   129  	if err == nil {
   130  		t.Error("expected error for non-existent file; got none")
   131  	}
   132  	template := New("root")
   133  	_, err = template.ParseFiles("testdata/file1.tmpl", "testdata/file2.tmpl")
   134  	if err != nil {
   135  		t.Fatalf("error parsing files: %v", err)
   136  	}
   137  	testExecute(multiExecTests, template, t)
   138  }
   139  
   140  func TestParseGlob(t *testing.T) {
   141  	_, err := ParseGlob("DOES NOT EXIST")
   142  	if err == nil {
   143  		t.Error("expected error for non-existent file; got none")
   144  	}
   145  	_, err = New("error").ParseGlob("[x")
   146  	if err == nil {
   147  		t.Error("expected error for bad pattern; got none")
   148  	}
   149  	template := New("root")
   150  	_, err = template.ParseGlob("testdata/file*.tmpl")
   151  	if err != nil {
   152  		t.Fatalf("error parsing files: %v", err)
   153  	}
   154  	testExecute(multiExecTests, template, t)
   155  }
   156  
   157  func TestParseFS(t *testing.T) {
   158  	fs := os.DirFS("testdata")
   159  
   160  	{
   161  		_, err := ParseFS(fs, "DOES NOT EXIST")
   162  		if err == nil {
   163  			t.Error("expected error for non-existent file; got none")
   164  		}
   165  	}
   166  
   167  	{
   168  		template := New("root")
   169  		_, err := template.ParseFS(fs, "file1.tmpl", "file2.tmpl")
   170  		if err != nil {
   171  			t.Fatalf("error parsing files: %v", err)
   172  		}
   173  		testExecute(multiExecTests, template, t)
   174  	}
   175  
   176  	{
   177  		template := New("root")
   178  		_, err := template.ParseFS(fs, "file*.tmpl")
   179  		if err != nil {
   180  			t.Fatalf("error parsing files: %v", err)
   181  		}
   182  		testExecute(multiExecTests, template, t)
   183  	}
   184  }
   185  
   186  // In these tests, actual content (not just template definitions) comes from the parsed files.
   187  
   188  var templateFileExecTests = []execTest{
   189  	{"test", `{{template "tmpl1.tmpl"}}{{template "tmpl2.tmpl"}}`, "template1\n\ny\ntemplate2\n\nx\n", 0, true},
   190  }
   191  
   192  func TestParseFilesWithData(t *testing.T) {
   193  	template, err := New("root").ParseFiles("testdata/tmpl1.tmpl", "testdata/tmpl2.tmpl")
   194  	if err != nil {
   195  		t.Fatalf("error parsing files: %v", err)
   196  	}
   197  	testExecute(templateFileExecTests, template, t)
   198  }
   199  
   200  func TestParseGlobWithData(t *testing.T) {
   201  	template, err := New("root").ParseGlob("testdata/tmpl*.tmpl")
   202  	if err != nil {
   203  		t.Fatalf("error parsing files: %v", err)
   204  	}
   205  	testExecute(templateFileExecTests, template, t)
   206  }
   207  
   208  const (
   209  	cloneText1 = `{{define "a"}}{{template "b"}}{{template "c"}}{{end}}`
   210  	cloneText2 = `{{define "b"}}b{{end}}`
   211  	cloneText3 = `{{define "c"}}root{{end}}`
   212  	cloneText4 = `{{define "c"}}clone{{end}}`
   213  )
   214  
   215  func TestClone(t *testing.T) {
   216  	// Create some templates and clone the root.
   217  	root, err := New("root").Parse(cloneText1)
   218  	if err != nil {
   219  		t.Fatal(err)
   220  	}
   221  	_, err = root.Parse(cloneText2)
   222  	if err != nil {
   223  		t.Fatal(err)
   224  	}
   225  	clone := Must(root.Clone())
   226  	// Add variants to both.
   227  	_, err = root.Parse(cloneText3)
   228  	if err != nil {
   229  		t.Fatal(err)
   230  	}
   231  	_, err = clone.Parse(cloneText4)
   232  	if err != nil {
   233  		t.Fatal(err)
   234  	}
   235  	// Verify that the clone is self-consistent.
   236  	for k, v := range clone.tmpl {
   237  		if k == clone.name && v.tmpl[k] != clone {
   238  			t.Error("clone does not contain root")
   239  		}
   240  		if v != v.tmpl[v.name] {
   241  			t.Errorf("clone does not contain self for %q", k)
   242  		}
   243  	}
   244  	// Execute root.
   245  	var b strings.Builder
   246  	err = root.ExecuteTemplate(&b, "a", 0)
   247  	if err != nil {
   248  		t.Fatal(err)
   249  	}
   250  	if b.String() != "broot" {
   251  		t.Errorf("expected %q got %q", "broot", b.String())
   252  	}
   253  	// Execute copy.
   254  	b.Reset()
   255  	err = clone.ExecuteTemplate(&b, "a", 0)
   256  	if err != nil {
   257  		t.Fatal(err)
   258  	}
   259  	if b.String() != "bclone" {
   260  		t.Errorf("expected %q got %q", "bclone", b.String())
   261  	}
   262  }
   263  
   264  func TestAddParseTree(t *testing.T) {
   265  	// Create some templates.
   266  	root, err := New("root").Parse(cloneText1)
   267  	if err != nil {
   268  		t.Fatal(err)
   269  	}
   270  	_, err = root.Parse(cloneText2)
   271  	if err != nil {
   272  		t.Fatal(err)
   273  	}
   274  	// Add a new parse tree.
   275  	tree, err := parse.Parse("cloneText3", cloneText3, "", "", nil, builtins())
   276  	if err != nil {
   277  		t.Fatal(err)
   278  	}
   279  	added, err := root.AddParseTree("c", tree["c"])
   280  	if err != nil {
   281  		t.Fatal(err)
   282  	}
   283  	// Execute.
   284  	var b strings.Builder
   285  	err = added.ExecuteTemplate(&b, "a", 0)
   286  	if err != nil {
   287  		t.Fatal(err)
   288  	}
   289  	if b.String() != "broot" {
   290  		t.Errorf("expected %q got %q", "broot", b.String())
   291  	}
   292  }
   293  
   294  // Issue 7032
   295  func TestAddParseTreeToUnparsedTemplate(t *testing.T) {
   296  	master := "{{define \"master\"}}{{end}}"
   297  	tmpl := New("master")
   298  	tree, err := parse.Parse("master", master, "", "", nil)
   299  	if err != nil {
   300  		t.Fatalf("unexpected parse err: %v", err)
   301  	}
   302  	masterTree := tree["master"]
   303  	tmpl.AddParseTree("master", masterTree) // used to panic
   304  }
   305  
   306  func TestRedefinition(t *testing.T) {
   307  	var tmpl *Template
   308  	var err error
   309  	if tmpl, err = New("tmpl1").Parse(`{{define "test"}}foo{{end}}`); err != nil {
   310  		t.Fatalf("parse 1: %v", err)
   311  	}
   312  	if _, err = tmpl.Parse(`{{define "test"}}bar{{end}}`); err != nil {
   313  		t.Fatalf("got error %v, expected nil", err)
   314  	}
   315  	if _, err = tmpl.New("tmpl2").Parse(`{{define "test"}}bar{{end}}`); err != nil {
   316  		t.Fatalf("got error %v, expected nil", err)
   317  	}
   318  }
   319  
   320  // Issue 10879
   321  func TestEmptyTemplateCloneCrash(t *testing.T) {
   322  	t1 := New("base")
   323  	t1.Clone() // used to panic
   324  }
   325  
   326  // Issue 10910, 10926
   327  func TestTemplateLookUp(t *testing.T) {
   328  	t1 := New("foo")
   329  	if t1.Lookup("foo") != nil {
   330  		t.Error("Lookup returned non-nil value for undefined template foo")
   331  	}
   332  	t1.New("bar")
   333  	if t1.Lookup("bar") != nil {
   334  		t.Error("Lookup returned non-nil value for undefined template bar")
   335  	}
   336  	t1.Parse(`{{define "foo"}}test{{end}}`)
   337  	if t1.Lookup("foo") == nil {
   338  		t.Error("Lookup returned nil value for defined template")
   339  	}
   340  }
   341  
   342  func TestNew(t *testing.T) {
   343  	// template with same name already exists
   344  	t1, _ := New("test").Parse(`{{define "test"}}foo{{end}}`)
   345  	t2 := t1.New("test")
   346  
   347  	if t1.common != t2.common {
   348  		t.Errorf("t1 & t2 didn't share common struct; got %v != %v", t1.common, t2.common)
   349  	}
   350  	if t1.Tree == nil {
   351  		t.Error("defined template got nil Tree")
   352  	}
   353  	if t2.Tree != nil {
   354  		t.Error("undefined template got non-nil Tree")
   355  	}
   356  
   357  	containsT1 := false
   358  	for _, tmpl := range t1.Templates() {
   359  		if tmpl == t2 {
   360  			t.Error("Templates included undefined template")
   361  		}
   362  		if tmpl == t1 {
   363  			containsT1 = true
   364  		}
   365  	}
   366  	if !containsT1 {
   367  		t.Error("Templates didn't include defined template")
   368  	}
   369  }
   370  
   371  func TestParse(t *testing.T) {
   372  	// In multiple calls to Parse with the same receiver template, only one call
   373  	// can contain text other than space, comments, and template definitions
   374  	t1 := New("test")
   375  	if _, err := t1.Parse(`{{define "test"}}{{end}}`); err != nil {
   376  		t.Fatalf("parsing test: %s", err)
   377  	}
   378  	if _, err := t1.Parse(`{{define "test"}}{{/* this is a comment */}}{{end}}`); err != nil {
   379  		t.Fatalf("parsing test: %s", err)
   380  	}
   381  	if _, err := t1.Parse(`{{define "test"}}foo{{end}}`); err != nil {
   382  		t.Fatalf("parsing test: %s", err)
   383  	}
   384  }
   385  
   386  func TestEmptyTemplate(t *testing.T) {
   387  	cases := []struct {
   388  		defn []string
   389  		in   string
   390  		want string
   391  	}{
   392  		{[]string{"x", "y"}, "", "y"},
   393  		{[]string{""}, "once", ""},
   394  		{[]string{"", ""}, "twice", ""},
   395  		{[]string{"{{.}}", "{{.}}"}, "twice", "twice"},
   396  		{[]string{"{{/* a comment */}}", "{{/* a comment */}}"}, "comment", ""},
   397  		{[]string{"{{.}}", ""}, "twice", ""},
   398  	}
   399  
   400  	for i, c := range cases {
   401  		root := New("root")
   402  
   403  		var (
   404  			m   *Template
   405  			err error
   406  		)
   407  		for _, d := range c.defn {
   408  			m, err = root.New(c.in).Parse(d)
   409  			if err != nil {
   410  				t.Fatal(err)
   411  			}
   412  		}
   413  		buf := &strings.Builder{}
   414  		if err := m.Execute(buf, c.in); err != nil {
   415  			t.Error(i, err)
   416  			continue
   417  		}
   418  		if buf.String() != c.want {
   419  			t.Errorf("expected string %q: got %q", c.want, buf.String())
   420  		}
   421  	}
   422  }
   423  
   424  // Issue 19249 was a regression in 1.8 caused by the handling of empty
   425  // templates added in that release, which got different answers depending
   426  // on the order templates appeared in the internal map.
   427  func TestIssue19294(t *testing.T) {
   428  	// The empty block in "xhtml" should be replaced during execution
   429  	// by the contents of "stylesheet", but if the internal map associating
   430  	// names with templates is built in the wrong order, the empty block
   431  	// looks non-empty and this doesn't happen.
   432  	var inlined = map[string]string{
   433  		"stylesheet": `{{define "stylesheet"}}stylesheet{{end}}`,
   434  		"xhtml":      `{{block "stylesheet" .}}{{end}}`,
   435  	}
   436  	all := []string{"stylesheet", "xhtml"}
   437  	for i := 0; i < 100; i++ {
   438  		res, err := New("title.xhtml").Parse(`{{template "xhtml" .}}`)
   439  		if err != nil {
   440  			t.Fatal(err)
   441  		}
   442  		for _, name := range all {
   443  			_, err := res.New(name).Parse(inlined[name])
   444  			if err != nil {
   445  				t.Fatal(err)
   446  			}
   447  		}
   448  		var buf strings.Builder
   449  		res.Execute(&buf, 0)
   450  		if buf.String() != "stylesheet" {
   451  			t.Fatalf("iteration %d: got %q; expected %q", i, buf.String(), "stylesheet")
   452  		}
   453  	}
   454  }
   455  
   456  // Issue 48436
   457  func TestAddToZeroTemplate(t *testing.T) {
   458  	tree, err := parse.Parse("c", cloneText3, "", "", nil, builtins())
   459  	if err != nil {
   460  		t.Fatal(err)
   461  	}
   462  	var tmpl Template
   463  	tmpl.AddParseTree("x", tree["c"])
   464  }
   465  

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