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259 lines
8.2 KiB
Go
259 lines
8.2 KiB
Go
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// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package template
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import "fmt"
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// context describes the state an HTML parser must be in when it reaches the
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// portion of HTML produced by evaluating a particular template node.
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//
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// The zero value of type context is the start context for a template that
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// produces an HTML fragment as defined at
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// https://www.w3.org/TR/html5/syntax.html#the-end
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// where the context element is null.
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type context struct {
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state state
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delim delim
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urlPart urlPart
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jsCtx jsCtx
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attr attr
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element element
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err *Error
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}
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func (c context) String() string {
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var err error
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if c.err != nil {
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err = c.err
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}
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return fmt.Sprintf("{%v %v %v %v %v %v %v}", c.state, c.delim, c.urlPart, c.jsCtx, c.attr, c.element, err)
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}
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// eq reports whether two contexts are equal.
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func (c context) eq(d context) bool {
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return c.state == d.state &&
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c.delim == d.delim &&
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c.urlPart == d.urlPart &&
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c.jsCtx == d.jsCtx &&
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c.attr == d.attr &&
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c.element == d.element &&
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c.err == d.err
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}
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// mangle produces an identifier that includes a suffix that distinguishes it
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// from template names mangled with different contexts.
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func (c context) mangle(templateName string) string {
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// The mangled name for the default context is the input templateName.
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if c.state == stateText {
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return templateName
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}
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s := templateName + "$htmltemplate_" + c.state.String()
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if c.delim != delimNone {
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s += "_" + c.delim.String()
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}
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if c.urlPart != urlPartNone {
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s += "_" + c.urlPart.String()
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}
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if c.jsCtx != jsCtxRegexp {
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s += "_" + c.jsCtx.String()
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}
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if c.attr != attrNone {
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s += "_" + c.attr.String()
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}
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if c.element != elementNone {
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s += "_" + c.element.String()
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}
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return s
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}
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// state describes a high-level HTML parser state.
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//
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// It bounds the top of the element stack, and by extension the HTML insertion
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// mode, but also contains state that does not correspond to anything in the
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// HTML5 parsing algorithm because a single token production in the HTML
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// grammar may contain embedded actions in a template. For instance, the quoted
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// HTML attribute produced by
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// <div title="Hello {{.World}}">
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// is a single token in HTML's grammar but in a template spans several nodes.
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type state uint8
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//go:generate stringer -type state
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const (
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// stateText is parsed character data. An HTML parser is in
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// this state when its parse position is outside an HTML tag,
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// directive, comment, and special element body.
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stateText state = iota
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// stateTag occurs before an HTML attribute or the end of a tag.
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stateTag
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// stateAttrName occurs inside an attribute name.
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// It occurs between the ^'s in ` ^name^ = value`.
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stateAttrName
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// stateAfterName occurs after an attr name has ended but before any
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// equals sign. It occurs between the ^'s in ` name^ ^= value`.
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stateAfterName
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// stateBeforeValue occurs after the equals sign but before the value.
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// It occurs between the ^'s in ` name =^ ^value`.
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stateBeforeValue
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// stateHTMLCmt occurs inside an <!-- HTML comment -->.
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stateHTMLCmt
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// stateRCDATA occurs inside an RCDATA element (<textarea> or <title>)
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// as described at https://www.w3.org/TR/html5/syntax.html#elements-0
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stateRCDATA
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// stateAttr occurs inside an HTML attribute whose content is text.
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stateAttr
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// stateURL occurs inside an HTML attribute whose content is a URL.
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stateURL
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// stateSrcset occurs inside an HTML srcset attribute.
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stateSrcset
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// stateJS occurs inside an event handler or script element.
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stateJS
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// stateJSDqStr occurs inside a JavaScript double quoted string.
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stateJSDqStr
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// stateJSSqStr occurs inside a JavaScript single quoted string.
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stateJSSqStr
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// stateJSRegexp occurs inside a JavaScript regexp literal.
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stateJSRegexp
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// stateJSBlockCmt occurs inside a JavaScript /* block comment */.
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stateJSBlockCmt
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// stateJSLineCmt occurs inside a JavaScript // line comment.
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stateJSLineCmt
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// stateCSS occurs inside a <style> element or style attribute.
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stateCSS
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// stateCSSDqStr occurs inside a CSS double quoted string.
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stateCSSDqStr
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// stateCSSSqStr occurs inside a CSS single quoted string.
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stateCSSSqStr
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// stateCSSDqURL occurs inside a CSS double quoted url("...").
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stateCSSDqURL
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// stateCSSSqURL occurs inside a CSS single quoted url('...').
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stateCSSSqURL
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// stateCSSURL occurs inside a CSS unquoted url(...).
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stateCSSURL
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// stateCSSBlockCmt occurs inside a CSS /* block comment */.
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stateCSSBlockCmt
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// stateCSSLineCmt occurs inside a CSS // line comment.
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stateCSSLineCmt
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// stateError is an infectious error state outside any valid
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// HTML/CSS/JS construct.
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stateError
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)
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// isComment is true for any state that contains content meant for template
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// authors & maintainers, not for end-users or machines.
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func isComment(s state) bool {
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switch s {
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case stateHTMLCmt, stateJSBlockCmt, stateJSLineCmt, stateCSSBlockCmt, stateCSSLineCmt:
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return true
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}
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return false
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}
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// isInTag return whether s occurs solely inside an HTML tag.
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func isInTag(s state) bool {
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switch s {
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case stateTag, stateAttrName, stateAfterName, stateBeforeValue, stateAttr:
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return true
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}
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return false
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}
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// delim is the delimiter that will end the current HTML attribute.
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type delim uint8
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//go:generate stringer -type delim
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const (
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// delimNone occurs outside any attribute.
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delimNone delim = iota
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// delimDoubleQuote occurs when a double quote (") closes the attribute.
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delimDoubleQuote
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// delimSingleQuote occurs when a single quote (') closes the attribute.
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delimSingleQuote
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// delimSpaceOrTagEnd occurs when a space or right angle bracket (>)
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// closes the attribute.
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delimSpaceOrTagEnd
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)
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// urlPart identifies a part in an RFC 3986 hierarchical URL to allow different
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// encoding strategies.
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type urlPart uint8
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//go:generate stringer -type urlPart
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const (
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// urlPartNone occurs when not in a URL, or possibly at the start:
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// ^ in "^http://auth/path?k=v#frag".
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urlPartNone urlPart = iota
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// urlPartPreQuery occurs in the scheme, authority, or path; between the
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// ^s in "h^ttp://auth/path^?k=v#frag".
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urlPartPreQuery
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// urlPartQueryOrFrag occurs in the query portion between the ^s in
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// "http://auth/path?^k=v#frag^".
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urlPartQueryOrFrag
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// urlPartUnknown occurs due to joining of contexts both before and
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// after the query separator.
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urlPartUnknown
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)
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// jsCtx determines whether a '/' starts a regular expression literal or a
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// division operator.
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type jsCtx uint8
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//go:generate stringer -type jsCtx
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const (
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// jsCtxRegexp occurs where a '/' would start a regexp literal.
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jsCtxRegexp jsCtx = iota
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// jsCtxDivOp occurs where a '/' would start a division operator.
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jsCtxDivOp
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// jsCtxUnknown occurs where a '/' is ambiguous due to context joining.
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jsCtxUnknown
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)
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// element identifies the HTML element when inside a start tag or special body.
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// Certain HTML element (for example <script> and <style>) have bodies that are
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// treated differently from stateText so the element type is necessary to
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// transition into the correct context at the end of a tag and to identify the
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// end delimiter for the body.
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type element uint8
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//go:generate stringer -type element
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const (
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// elementNone occurs outside a special tag or special element body.
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elementNone element = iota
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// elementScript corresponds to the raw text <script> element
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// with JS MIME type or no type attribute.
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elementScript
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// elementStyle corresponds to the raw text <style> element.
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elementStyle
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// elementTextarea corresponds to the RCDATA <textarea> element.
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elementTextarea
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// elementTitle corresponds to the RCDATA <title> element.
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elementTitle
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)
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//go:generate stringer -type attr
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// attr identifies the current HTML attribute when inside the attribute,
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// that is, starting from stateAttrName until stateTag/stateText (exclusive).
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type attr uint8
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const (
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// attrNone corresponds to a normal attribute or no attribute.
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attrNone attr = iota
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// attrScript corresponds to an event handler attribute.
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attrScript
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// attrScriptType corresponds to the type attribute in script HTML element
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attrScriptType
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// attrStyle corresponds to the style attribute whose value is CSS.
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attrStyle
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// attrURL corresponds to an attribute whose value is a URL.
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attrURL
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// attrSrcset corresponds to a srcset attribute.
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attrSrcset
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)
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