dependencies: update

set go min requirements to 1.19
update dependencies
update vendor

1 files changed, 312 insertions, 0 deletions

diff --git a/vendor/github.com/google/safehtml/template/transition.go b/vendor/github.com/google/safehtml/template/transition.go
new file mode 100644
index 000000000..e0882e489
--- /dev/null
+++ b/vendor/github.com/google/safehtml/template/transition.go
@@ -0,0 +1,312 @@
+// 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 template
+
+import (
+	"bytes"
+	"strings"
+)
+
+// transitionFunc is the array of context transition functions for text nodes.
+// A transition function takes a context and template text input, and returns
+// the updated context and the number of bytes consumed from the front of the
+// input.
+var transitionFunc = [...]func(context, []byte) (context, int){
+	stateText:               tText,
+	stateSpecialElementBody: tSpecialTagEnd,
+	stateTag:                tTag,
+	stateAttrName:           tAttrName,
+	stateAfterName:          tAfterName,
+	stateBeforeValue:        tBeforeValue,
+	stateHTMLCmt:            tHTMLCmt,
+	stateAttr:               tAttr,
+	stateError:              tError,
+}
+
+var commentStart = []byte("<!--")
+var commentEnd = []byte("-->")
+
+// tText is the context transition function for the text state.
+func tText(c context, s []byte) (context, int) {
+	k := 0
+	for {
+		i := k + bytes.IndexByte(s[k:], '<')
+		if i < k || i+1 == len(s) {
+			return c, len(s)
+		} else if i+4 <= len(s) && bytes.Equal(commentStart, s[i:i+4]) {
+			return context{state: stateHTMLCmt}, i + 4
+		}
+		i++
+		end := false
+		if s[i] == '/' {
+			if i+1 == len(s) {
+				return c, len(s)
+			}
+			end, i = true, i+1
+		}
+		j, e := eatTagName(s, i)
+		if j != i {
+			// We've found an HTML tag.
+			ret := context{state: stateTag}
+			// Element name not needed if we are at the end of the element.
+			if !end {
+				ret.element = e
+			}
+			return ret, j
+		}
+		k = j
+	}
+}
+
+// specialElements contains the names of elements whose bodies are treated
+// differently by the parser and escaper from stateText.
+var specialElements = map[string]bool{
+	"script":   true,
+	"style":    true,
+	"textarea": true,
+	"title":    true,
+}
+
+// voidElements contains the names of all void elements.
+// https://www.w3.org/TR/html5/syntax.html#void-elements
+var voidElements = map[string]bool{
+	"area":   true,
+	"base":   true,
+	"br":     true,
+	"col":    true,
+	"embed":  true,
+	"hr":     true,
+	"img":    true,
+	"input":  true,
+	"keygen": true,
+	"link":   true,
+	"meta":   true,
+	"param":  true,
+	"source": true,
+	"track":  true,
+	"wbr":    true,
+}
+
+// tTag is the context transition function for the tag state.
+func tTag(c context, s []byte) (context, int) {
+	// Find the attribute name.
+	i := eatWhiteSpace(s, 0)
+	if i == len(s) {
+		return c, len(s)
+	}
+	if s[i] == '>' {
+		ret := context{
+			state:      stateText,
+			element:    c.element,
+			scriptType: c.scriptType,
+			linkRel:    c.linkRel,
+		}
+		if specialElements[c.element.name] {
+			ret.state = stateSpecialElementBody
+		}
+		if c.element.name != "" && voidElements[c.element.name] {
+			// Special case: end of start tag of a void element.
+			// Discard unnecessary state, since this element have no content.
+			ret.element = element{}
+			ret.scriptType = ""
+			ret.linkRel = ""
+		}
+		return ret, i + 1
+	}
+	j, err := eatAttrName(s, i)
+	if err != nil {
+		return context{state: stateError, err: err}, len(s)
+	}
+	state := stateTag
+	if i == j {
+		return context{
+			state: stateError,
+			err:   errorf(ErrBadHTML, nil, 0, "expected space, attr name, or end of tag, but got %q", s[i:]),
+		}, len(s)
+	}
+
+	if j == len(s) {
+		state = stateAttrName
+	} else {
+		state = stateAfterName
+	}
+	return context{
+		state:   state,
+		element: c.element,
+		attr:    attr{name: strings.ToLower(string(s[i:j]))},
+		linkRel: c.linkRel,
+	}, j
+}
+
+// tAttrName is the context transition function for stateAttrName.
+func tAttrName(c context, s []byte) (context, int) {
+	i, err := eatAttrName(s, 0)
+	if err != nil {
+		return context{state: stateError, err: err}, len(s)
+	} else if i != len(s) {
+		c.state = stateAfterName
+	}
+	return c, i
+}
+
+// tAfterName is the context transition function for stateAfterName.
+func tAfterName(c context, s []byte) (context, int) {
+	// Look for the start of the value.
+	i := eatWhiteSpace(s, 0)
+	if i == len(s) {
+		return c, len(s)
+	} else if s[i] != '=' {
+		// Occurs due to tag ending '>', and valueless attribute.
+		c.state = stateTag
+		return c, i
+	}
+	c.state = stateBeforeValue
+	// Consume the "=".
+	return c, i + 1
+}
+
+// tBeforeValue is the context transition function for stateBeforeValue.
+func tBeforeValue(c context, s []byte) (context, int) {
+	i := eatWhiteSpace(s, 0)
+	if i == len(s) {
+		return c, len(s)
+	}
+	// Find the attribute delimiter.
+	// TODO: consider disallowing single-quoted or unquoted attribute values completely, even in hardcoded template text.
+	delim := delimSpaceOrTagEnd
+	switch s[i] {
+	case '\'':
+		delim, i = delimSingleQuote, i+1
+	case '"':
+		delim, i = delimDoubleQuote, i+1
+	}
+	c.state, c.delim = stateAttr, delim
+	return c, i
+}
+
+// tHTMLCmt is the context transition function for stateHTMLCmt.
+func tHTMLCmt(c context, s []byte) (context, int) {
+	if i := bytes.Index(s, commentEnd); i != -1 {
+		return context{}, i + 3
+	}
+	return c, len(s)
+}
+
+var (
+	specialTagEndPrefix = []byte("</")
+	tagEndSeparators    = []byte("> \t\n\f/")
+)
+
+// tSpecialTagEnd is the context transition function for raw text, RCDATA
+// script data, and stylesheet element states.
+func tSpecialTagEnd(c context, s []byte) (context, int) {
+	if specialElements[c.element.name] {
+		if i := indexTagEnd(s, []byte(c.element.name)); i != -1 {
+			return context{}, i
+		}
+	}
+	return c, len(s)
+}
+
+// indexTagEnd finds the index of a special tag end in a case insensitive way, or returns -1
+func indexTagEnd(s []byte, tag []byte) int {
+	res := 0
+	plen := len(specialTagEndPrefix)
+	for len(s) > 0 {
+		// Try to find the tag end prefix first
+		i := bytes.Index(s, specialTagEndPrefix)
+		if i == -1 {
+			return i
+		}
+		s = s[i+plen:]
+		// Try to match the actual tag if there is still space for it
+		if len(tag) <= len(s) && bytes.EqualFold(tag, s[:len(tag)]) {
+			s = s[len(tag):]
+			// Check the tag is followed by a proper separator
+			if len(s) > 0 && bytes.IndexByte(tagEndSeparators, s[0]) != -1 {
+				return res + i
+			}
+			res += len(tag)
+		}
+		res += i + plen
+	}
+	return -1
+}
+
+// tAttr is the context transition function for the attribute state.
+func tAttr(c context, s []byte) (context, int) {
+	return c, len(s)
+}
+
+// tError is the context transition function for the error state.
+func tError(c context, s []byte) (context, int) {
+	return c, len(s)
+}
+
+// eatAttrName returns the largest j such that s[i:j] is an attribute name.
+// It returns an error if s[i:] does not look like it begins with an
+// attribute name, such as encountering a quote mark without a preceding
+// equals sign.
+func eatAttrName(s []byte, i int) (int, *Error) {
+	for j := i; j < len(s); j++ {
+		switch s[j] {
+		case ' ', '\t', '\n', '\f', '\r', '=', '>':
+			return j, nil
+		case '\'', '"', '<':
+			// These result in a parse warning in HTML5 and are
+			// indicative of serious problems if seen in an attr
+			// name in a template.
+			return -1, errorf(ErrBadHTML, nil, 0, "%q in attribute name: %.32q", s[j:j+1], s)
+		default:
+			// No-op.
+		}
+	}
+	return len(s), nil
+}
+
+// asciiAlpha reports whether c is an ASCII letter.
+func asciiAlpha(c byte) bool {
+	return 'A' <= c && c <= 'Z' || 'a' <= c && c <= 'z'
+}
+
+// asciiAlphaNum reports whether c is an ASCII letter or digit.
+func asciiAlphaNum(c byte) bool {
+	return asciiAlpha(c) || '0' <= c && c <= '9'
+}
+
+// eatTagName returns the largest j such that s[i:j] is a tag name and the tag name.
+func eatTagName(s []byte, i int) (int, element) {
+	if i == len(s) || !asciiAlpha(s[i]) {
+		return i, element{}
+	}
+	j := i + 1
+	for j < len(s) {
+		x := s[j]
+		if asciiAlphaNum(x) {
+			j++
+			continue
+		}
+		// Allow "x-y" or "x:y" but not "x-", "-y", or "x--y".
+		if (x == ':' || x == '-') && j+1 < len(s) && asciiAlphaNum(s[j+1]) {
+			j += 2
+			continue
+		}
+		break
+	}
+	return j, element{name: strings.ToLower(string(s[i:j]))}
+}
+
+// eatWhiteSpace returns the largest j such that s[i:j] is white space.
+func eatWhiteSpace(s []byte, i int) int {
+	for j := i; j < len(s); j++ {
+		switch s[j] {
+		case ' ', '\t', '\n', '\f', '\r':
+			// No-op.
+		default:
+			return j
+		}
+	}
+	return len(s)
+}