1 files changed, 557 insertions, 0 deletions
diff --git a/src/text/template/parse/lex_test.go b/src/text/template/parse/lex_test.go
new file mode 100644
index 0000000..6510eed
--- /dev/null
+++ b/src/text/template/parse/lex_test.go
@@ -0,0 +1,557 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package parse
+
+import (
+	"fmt"
+	"testing"
+)
+
+// Make the types prettyprint.
+var itemName = map[itemType]string{
+	itemError:        "error",
+	itemBool:         "bool",
+	itemChar:         "char",
+	itemCharConstant: "charconst",
+	itemComment:      "comment",
+	itemComplex:      "complex",
+	itemDeclare:      ":=",
+	itemEOF:          "EOF",
+	itemField:        "field",
+	itemIdentifier:   "identifier",
+	itemLeftDelim:    "left delim",
+	itemLeftParen:    "(",
+	itemNumber:       "number",
+	itemPipe:         "pipe",
+	itemRawString:    "raw string",
+	itemRightDelim:   "right delim",
+	itemRightParen:   ")",
+	itemSpace:        "space",
+	itemString:       "string",
+	itemVariable:     "variable",
+
+	// keywords
+	itemDot:      ".",
+	itemBlock:    "block",
+	itemDefine:   "define",
+	itemElse:     "else",
+	itemIf:       "if",
+	itemEnd:      "end",
+	itemNil:      "nil",
+	itemRange:    "range",
+	itemTemplate: "template",
+	itemWith:     "with",
+}
+
+func (i itemType) String() string {
+	s := itemName[i]
+	if s == "" {
+		return fmt.Sprintf("item%d", int(i))
+	}
+	return s
+}
+
+type lexTest struct {
+	name  string
+	input string
+	items []item
+}
+
+func mkItem(typ itemType, text string) item {
+	return item{
+		typ: typ,
+		val: text,
+	}
+}
+
+var (
+	tDot        = mkItem(itemDot, ".")
+	tBlock      = mkItem(itemBlock, "block")
+	tEOF        = mkItem(itemEOF, "")
+	tFor        = mkItem(itemIdentifier, "for")
+	tLeft       = mkItem(itemLeftDelim, "{{")
+	tLpar       = mkItem(itemLeftParen, "(")
+	tPipe       = mkItem(itemPipe, "|")
+	tQuote      = mkItem(itemString, `"abc \n\t\" "`)
+	tRange      = mkItem(itemRange, "range")
+	tRight      = mkItem(itemRightDelim, "}}")
+	tRpar       = mkItem(itemRightParen, ")")
+	tSpace      = mkItem(itemSpace, " ")
+	raw         = "`" + `abc\n\t\" ` + "`"
+	rawNL       = "`now is{{\n}}the time`" // Contains newline inside raw quote.
+	tRawQuote   = mkItem(itemRawString, raw)
+	tRawQuoteNL = mkItem(itemRawString, rawNL)
+)
+
+var lexTests = []lexTest{
+	{"empty", "", []item{tEOF}},
+	{"spaces", " \t\n", []item{mkItem(itemText, " \t\n"), tEOF}},
+	{"text", `now is the time`, []item{mkItem(itemText, "now is the time"), tEOF}},
+	{"text with comment", "hello-{{/* this is a comment */}}-world", []item{
+		mkItem(itemText, "hello-"),
+		mkItem(itemComment, "/* this is a comment */"),
+		mkItem(itemText, "-world"),
+		tEOF,
+	}},
+	{"punctuation", "{{,@% }}", []item{
+		tLeft,
+		mkItem(itemChar, ","),
+		mkItem(itemChar, "@"),
+		mkItem(itemChar, "%"),
+		tSpace,
+		tRight,
+		tEOF,
+	}},
+	{"parens", "{{((3))}}", []item{
+		tLeft,
+		tLpar,
+		tLpar,
+		mkItem(itemNumber, "3"),
+		tRpar,
+		tRpar,
+		tRight,
+		tEOF,
+	}},
+	{"empty action", `{{}}`, []item{tLeft, tRight, tEOF}},
+	{"for", `{{for}}`, []item{tLeft, tFor, tRight, tEOF}},
+	{"block", `{{block "foo" .}}`, []item{
+		tLeft, tBlock, tSpace, mkItem(itemString, `"foo"`), tSpace, tDot, tRight, tEOF,
+	}},
+	{"quote", `{{"abc \n\t\" "}}`, []item{tLeft, tQuote, tRight, tEOF}},
+	{"raw quote", "{{" + raw + "}}", []item{tLeft, tRawQuote, tRight, tEOF}},
+	{"raw quote with newline", "{{" + rawNL + "}}", []item{tLeft, tRawQuoteNL, tRight, tEOF}},
+	{"numbers", "{{1 02 0x14 0X14 -7.2i 1e3 1E3 +1.2e-4 4.2i 1+2i 1_2 0x1.e_fp4 0X1.E_FP4}}", []item{
+		tLeft,
+		mkItem(itemNumber, "1"),
+		tSpace,
+		mkItem(itemNumber, "02"),
+		tSpace,
+		mkItem(itemNumber, "0x14"),
+		tSpace,
+		mkItem(itemNumber, "0X14"),
+		tSpace,
+		mkItem(itemNumber, "-7.2i"),
+		tSpace,
+		mkItem(itemNumber, "1e3"),
+		tSpace,
+		mkItem(itemNumber, "1E3"),
+		tSpace,
+		mkItem(itemNumber, "+1.2e-4"),
+		tSpace,
+		mkItem(itemNumber, "4.2i"),
+		tSpace,
+		mkItem(itemComplex, "1+2i"),
+		tSpace,
+		mkItem(itemNumber, "1_2"),
+		tSpace,
+		mkItem(itemNumber, "0x1.e_fp4"),
+		tSpace,
+		mkItem(itemNumber, "0X1.E_FP4"),
+		tRight,
+		tEOF,
+	}},
+	{"characters", `{{'a' '\n' '\'' '\\' '\u00FF' '\xFF' '本'}}`, []item{
+		tLeft,
+		mkItem(itemCharConstant, `'a'`),
+		tSpace,
+		mkItem(itemCharConstant, `'\n'`),
+		tSpace,
+		mkItem(itemCharConstant, `'\''`),
+		tSpace,
+		mkItem(itemCharConstant, `'\\'`),
+		tSpace,
+		mkItem(itemCharConstant, `'\u00FF'`),
+		tSpace,
+		mkItem(itemCharConstant, `'\xFF'`),
+		tSpace,
+		mkItem(itemCharConstant, `'本'`),
+		tRight,
+		tEOF,
+	}},
+	{"bools", "{{true false}}", []item{
+		tLeft,
+		mkItem(itemBool, "true"),
+		tSpace,
+		mkItem(itemBool, "false"),
+		tRight,
+		tEOF,
+	}},
+	{"dot", "{{.}}", []item{
+		tLeft,
+		tDot,
+		tRight,
+		tEOF,
+	}},
+	{"nil", "{{nil}}", []item{
+		tLeft,
+		mkItem(itemNil, "nil"),
+		tRight,
+		tEOF,
+	}},
+	{"dots", "{{.x . .2 .x.y.z}}", []item{
+		tLeft,
+		mkItem(itemField, ".x"),
+		tSpace,
+		tDot,
+		tSpace,
+		mkItem(itemNumber, ".2"),
+		tSpace,
+		mkItem(itemField, ".x"),
+		mkItem(itemField, ".y"),
+		mkItem(itemField, ".z"),
+		tRight,
+		tEOF,
+	}},
+	{"keywords", "{{range if else end with}}", []item{
+		tLeft,
+		mkItem(itemRange, "range"),
+		tSpace,
+		mkItem(itemIf, "if"),
+		tSpace,
+		mkItem(itemElse, "else"),
+		tSpace,
+		mkItem(itemEnd, "end"),
+		tSpace,
+		mkItem(itemWith, "with"),
+		tRight,
+		tEOF,
+	}},
+	{"variables", "{{$c := printf $ $hello $23 $ $var.Field .Method}}", []item{
+		tLeft,
+		mkItem(itemVariable, "$c"),
+		tSpace,
+		mkItem(itemDeclare, ":="),
+		tSpace,
+		mkItem(itemIdentifier, "printf"),
+		tSpace,
+		mkItem(itemVariable, "$"),
+		tSpace,
+		mkItem(itemVariable, "$hello"),
+		tSpace,
+		mkItem(itemVariable, "$23"),
+		tSpace,
+		mkItem(itemVariable, "$"),
+		tSpace,
+		mkItem(itemVariable, "$var"),
+		mkItem(itemField, ".Field"),
+		tSpace,
+		mkItem(itemField, ".Method"),
+		tRight,
+		tEOF,
+	}},
+	{"variable invocation", "{{$x 23}}", []item{
+		tLeft,
+		mkItem(itemVariable, "$x"),
+		tSpace,
+		mkItem(itemNumber, "23"),
+		tRight,
+		tEOF,
+	}},
+	{"pipeline", `intro {{echo hi 1.2 |noargs|args 1 "hi"}} outro`, []item{
+		mkItem(itemText, "intro "),
+		tLeft,
+		mkItem(itemIdentifier, "echo"),
+		tSpace,
+		mkItem(itemIdentifier, "hi"),
+		tSpace,
+		mkItem(itemNumber, "1.2"),
+		tSpace,
+		tPipe,
+		mkItem(itemIdentifier, "noargs"),
+		tPipe,
+		mkItem(itemIdentifier, "args"),
+		tSpace,
+		mkItem(itemNumber, "1"),
+		tSpace,
+		mkItem(itemString, `"hi"`),
+		tRight,
+		mkItem(itemText, " outro"),
+		tEOF,
+	}},
+	{"declaration", "{{$v := 3}}", []item{
+		tLeft,
+		mkItem(itemVariable, "$v"),
+		tSpace,
+		mkItem(itemDeclare, ":="),
+		tSpace,
+		mkItem(itemNumber, "3"),
+		tRight,
+		tEOF,
+	}},
+	{"2 declarations", "{{$v , $w := 3}}", []item{
+		tLeft,
+		mkItem(itemVariable, "$v"),
+		tSpace,
+		mkItem(itemChar, ","),
+		tSpace,
+		mkItem(itemVariable, "$w"),
+		tSpace,
+		mkItem(itemDeclare, ":="),
+		tSpace,
+		mkItem(itemNumber, "3"),
+		tRight,
+		tEOF,
+	}},
+	{"field of parenthesized expression", "{{(.X).Y}}", []item{
+		tLeft,
+		tLpar,
+		mkItem(itemField, ".X"),
+		tRpar,
+		mkItem(itemField, ".Y"),
+		tRight,
+		tEOF,
+	}},
+	{"trimming spaces before and after", "hello- {{- 3 -}} -world", []item{
+		mkItem(itemText, "hello-"),
+		tLeft,
+		mkItem(itemNumber, "3"),
+		tRight,
+		mkItem(itemText, "-world"),
+		tEOF,
+	}},
+	{"trimming spaces before and after comment", "hello- {{- /* hello */ -}} -world", []item{
+		mkItem(itemText, "hello-"),
+		mkItem(itemComment, "/* hello */"),
+		mkItem(itemText, "-world"),
+		tEOF,
+	}},
+	// errors
+	{"badchar", "#{{\x01}}", []item{
+		mkItem(itemText, "#"),
+		tLeft,
+		mkItem(itemError, "unrecognized character in action: U+0001"),
+	}},
+	{"unclosed action", "{{", []item{
+		tLeft,
+		mkItem(itemError, "unclosed action"),
+	}},
+	{"EOF in action", "{{range", []item{
+		tLeft,
+		tRange,
+		mkItem(itemError, "unclosed action"),
+	}},
+	{"unclosed quote", "{{\"\n\"}}", []item{
+		tLeft,
+		mkItem(itemError, "unterminated quoted string"),
+	}},
+	{"unclosed raw quote", "{{`xx}}", []item{
+		tLeft,
+		mkItem(itemError, "unterminated raw quoted string"),
+	}},
+	{"unclosed char constant", "{{'\n}}", []item{
+		tLeft,
+		mkItem(itemError, "unterminated character constant"),
+	}},
+	{"bad number", "{{3k}}", []item{
+		tLeft,
+		mkItem(itemError, `bad number syntax: "3k"`),
+	}},
+	{"unclosed paren", "{{(3}}", []item{
+		tLeft,
+		tLpar,
+		mkItem(itemNumber, "3"),
+		mkItem(itemError, `unclosed left paren`),
+	}},
+	{"extra right paren", "{{3)}}", []item{
+		tLeft,
+		mkItem(itemNumber, "3"),
+		tRpar,
+		mkItem(itemError, `unexpected right paren U+0029 ')'`),
+	}},
+
+	// Fixed bugs
+	// Many elements in an action blew the lookahead until
+	// we made lexInsideAction not loop.
+	{"long pipeline deadlock", "{{|||||}}", []item{
+		tLeft,
+		tPipe,
+		tPipe,
+		tPipe,
+		tPipe,
+		tPipe,
+		tRight,
+		tEOF,
+	}},
+	{"text with bad comment", "hello-{{/*/}}-world", []item{
+		mkItem(itemText, "hello-"),
+		mkItem(itemError, `unclosed comment`),
+	}},
+	{"text with comment close separated from delim", "hello-{{/* */ }}-world", []item{
+		mkItem(itemText, "hello-"),
+		mkItem(itemError, `comment ends before closing delimiter`),
+	}},
+	// This one is an error that we can't catch because it breaks templates with
+	// minimized JavaScript. Should have fixed it before Go 1.1.
+	{"unmatched right delimiter", "hello-{.}}-world", []item{
+		mkItem(itemText, "hello-{.}}-world"),
+		tEOF,
+	}},
+}
+
+// collect gathers the emitted items into a slice.
+func collect(t *lexTest, left, right string) (items []item) {
+	l := lex(t.name, t.input, left, right, true)
+	for {
+		item := l.nextItem()
+		items = append(items, item)
+		if item.typ == itemEOF || item.typ == itemError {
+			break
+		}
+	}
+	return
+}
+
+func equal(i1, i2 []item, checkPos bool) bool {
+	if len(i1) != len(i2) {
+		return false
+	}
+	for k := range i1 {
+		if i1[k].typ != i2[k].typ {
+			return false
+		}
+		if i1[k].val != i2[k].val {
+			return false
+		}
+		if checkPos && i1[k].pos != i2[k].pos {
+			return false
+		}
+		if checkPos && i1[k].line != i2[k].line {
+			return false
+		}
+	}
+	return true
+}
+
+func TestLex(t *testing.T) {
+	for _, test := range lexTests {
+		items := collect(&test, "", "")
+		if !equal(items, test.items, false) {
+			t.Errorf("%s: got\n\t%+v\nexpected\n\t%v", test.name, items, test.items)
+		}
+	}
+}
+
+// Some easy cases from above, but with delimiters $$ and @@
+var lexDelimTests = []lexTest{
+	{"punctuation", "$$,@%{{}}@@", []item{
+		tLeftDelim,
+		mkItem(itemChar, ","),
+		mkItem(itemChar, "@"),
+		mkItem(itemChar, "%"),
+		mkItem(itemChar, "{"),
+		mkItem(itemChar, "{"),
+		mkItem(itemChar, "}"),
+		mkItem(itemChar, "}"),
+		tRightDelim,
+		tEOF,
+	}},
+	{"empty action", `$$@@`, []item{tLeftDelim, tRightDelim, tEOF}},
+	{"for", `$$for@@`, []item{tLeftDelim, tFor, tRightDelim, tEOF}},
+	{"quote", `$$"abc \n\t\" "@@`, []item{tLeftDelim, tQuote, tRightDelim, tEOF}},
+	{"raw quote", "$$" + raw + "@@", []item{tLeftDelim, tRawQuote, tRightDelim, tEOF}},
+}
+
+var (
+	tLeftDelim  = mkItem(itemLeftDelim, "$$")
+	tRightDelim = mkItem(itemRightDelim, "@@")
+)
+
+func TestDelims(t *testing.T) {
+	for _, test := range lexDelimTests {
+		items := collect(&test, "$$", "@@")
+		if !equal(items, test.items, false) {
+			t.Errorf("%s: got\n\t%v\nexpected\n\t%v", test.name, items, test.items)
+		}
+	}
+}
+
+var lexPosTests = []lexTest{
+	{"empty", "", []item{{itemEOF, 0, "", 1}}},
+	{"punctuation", "{{,@%#}}", []item{
+		{itemLeftDelim, 0, "{{", 1},
+		{itemChar, 2, ",", 1},
+		{itemChar, 3, "@", 1},
+		{itemChar, 4, "%", 1},
+		{itemChar, 5, "#", 1},
+		{itemRightDelim, 6, "}}", 1},
+		{itemEOF, 8, "", 1},
+	}},
+	{"sample", "0123{{hello}}xyz", []item{
+		{itemText, 0, "0123", 1},
+		{itemLeftDelim, 4, "{{", 1},
+		{itemIdentifier, 6, "hello", 1},
+		{itemRightDelim, 11, "}}", 1},
+		{itemText, 13, "xyz", 1},
+		{itemEOF, 16, "", 1},
+	}},
+	{"trimafter", "{{x -}}\n{{y}}", []item{
+		{itemLeftDelim, 0, "{{", 1},
+		{itemIdentifier, 2, "x", 1},
+		{itemRightDelim, 5, "}}", 1},
+		{itemLeftDelim, 8, "{{", 2},
+		{itemIdentifier, 10, "y", 2},
+		{itemRightDelim, 11, "}}", 2},
+		{itemEOF, 13, "", 2},
+	}},
+	{"trimbefore", "{{x}}\n{{- y}}", []item{
+		{itemLeftDelim, 0, "{{", 1},
+		{itemIdentifier, 2, "x", 1},
+		{itemRightDelim, 3, "}}", 1},
+		{itemLeftDelim, 6, "{{", 2},
+		{itemIdentifier, 10, "y", 2},
+		{itemRightDelim, 11, "}}", 2},
+		{itemEOF, 13, "", 2},
+	}},
+}
+
+// The other tests don't check position, to make the test cases easier to construct.
+// This one does.
+func TestPos(t *testing.T) {
+	for _, test := range lexPosTests {
+		items := collect(&test, "", "")
+		if !equal(items, test.items, true) {
+			t.Errorf("%s: got\n\t%v\nexpected\n\t%v", test.name, items, test.items)
+			if len(items) == len(test.items) {
+				// Detailed print; avoid item.String() to expose the position value.
+				for i := range items {
+					if !equal(items[i:i+1], test.items[i:i+1], true) {
+						i1 := items[i]
+						i2 := test.items[i]
+						t.Errorf("\t#%d: got {%v %d %q %d} expected {%v %d %q %d}",
+							i, i1.typ, i1.pos, i1.val, i1.line, i2.typ, i2.pos, i2.val, i2.line)
+					}
+				}
+			}
+		}
+	}
+}
+
+// Test that an error shuts down the lexing goroutine.
+func TestShutdown(t *testing.T) {
+	// We need to duplicate template.Parse here to hold on to the lexer.
+	const text = "erroneous{{define}}{{else}}1234"
+	lexer := lex("foo", text, "{{", "}}", false)
+	_, err := New("root").parseLexer(lexer)
+	if err == nil {
+		t.Fatalf("expected error")
+	}
+	// The error should have drained the input. Therefore, the lexer should be shut down.
+	token, ok := <-lexer.items
+	if ok {
+		t.Fatalf("input was not drained; got %v", token)
+	}
+}
+
+// parseLexer is a local version of parse that lets us pass in the lexer instead of building it.
+// We expect an error, so the tree set and funcs list are explicitly nil.
+func (t *Tree) parseLexer(lex *lexer) (tree *Tree, err error) {
+	defer t.recover(&err)
+	t.ParseName = t.Name
+	t.startParse(nil, lex, map[string]*Tree{})
+	t.parse()
+	t.add()
+	t.stopParse()
+	return t, nil
+}