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templateparser.go
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templateparser.go
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package parser
import (
"fmt"
"github.com/a-h/parse"
)
// TemplateExpression.
// TemplateExpression.
// templ Func(p Parameter) {
// templ (data Data) Func(p Parameter) {
// templ (data []string) Func(p Parameter) {
type templateExpression struct {
Expression Expression
}
var templateExpressionStartParser = parse.String("templ ")
var templateExpressionParser = parse.Func(func(pi *parse.Input) (r templateExpression, ok bool, err error) {
// Check the prefix first.
if _, ok, err = templateExpressionStartParser.Parse(pi); err != nil || !ok {
return
}
// Once we have the prefix, everything to the brace at the end of the line is Go.
// e.g.
// templ (x []string) Test() {
// becomes:
// func (x []string) Test() templ.Component {
// Once we've got a prefix, read until {\n.
until := parse.All(openBraceWithOptionalPadding, parse.NewLine)
msg := "templ: malformed templ expression, expected `templ functionName() {`"
if r.Expression, ok, err = Must(ExpressionOf(parse.StringUntil(until)), msg).Parse(pi); err != nil || !ok {
return
}
// Eat " {\n".
if _, ok, err = Must(until, msg).Parse(pi); err != nil || !ok {
return
}
return r, true, nil
})
// Template node (element, call, if, switch, for, whitespace etc.)
func newTemplateNodeParser[TUntil any](until parse.Parser[TUntil], untilName string) templateNodeParser[TUntil] {
return templateNodeParser[TUntil]{
until: until,
untilName: untilName,
}
}
type templateNodeParser[TUntil any] struct {
until parse.Parser[TUntil]
untilName string
}
var rawElements = parse.Any[RawElement](styleElement, scriptElement)
var comment = parse.Any[Comment](htmlComment)
func (p templateNodeParser[T]) Parse(pi *parse.Input) (op []Node, ok bool, err error) {
for {
// Check if we've reached the end.
if p.until != nil {
start := pi.Index()
_, ok, err = p.until.Parse(pi)
if err != nil {
return
}
if ok {
pi.Seek(start)
return op, true, nil
}
}
// Try for valid nodes.
// Try for a doctype.
// <!DOCTYPE html>
var docTypeNode DocType
docTypeNode, ok, err = docTypeParser.Parse(pi)
if err != nil {
return
}
if ok {
op = append(op, docTypeNode)
continue
}
// Try for a comment.
// <!--
var commentNode Comment
commentNode, ok, err = comment.Parse(pi)
if err != nil {
return
}
if ok {
op = append(op, commentNode)
continue
}
// Try for a raw <text>, <>, or <style> element (special behaviour - contents are not parsed).
var rawElementNode RawElement
rawElementNode, ok, err = rawElements.Parse(pi)
if err != nil {
return
}
if ok {
op = append(op, rawElementNode)
continue
}
// Try for an element.
// <a>, <br/> etc.
var elementNode Element
elementNode, ok, err = element.Parse(pi)
if err != nil {
return
}
if ok {
op = append(op, elementNode)
continue
}
// Try for an if expression.
// if {}
var ifNode IfExpression
ifNode, ok, err = ifExpression.Parse(pi)
if err != nil {
return
}
if ok {
op = append(op, ifNode)
continue
}
// Try for a for expression.
// for {}
var forNode ForExpression
forNode, ok, err = forExpression.Parse(pi)
if err != nil {
return
}
if ok {
op = append(op, forNode)
continue
}
// Try for a switch expression.
// switch {}
var switchNode SwitchExpression
switchNode, ok, err = switchExpression.Parse(pi)
if err != nil {
return
}
if ok {
op = append(op, switchNode)
continue
}
// Try for a call template expression.
// {! TemplateName(a, b, c) }
var cteNode CallTemplateExpression
cteNode, ok, err = callTemplateExpression.Parse(pi)
if err != nil {
return
}
if ok {
op = append(op, cteNode)
continue
}
// Try for a templ element expression.
// <!TemplateName(a, b, c) />
var templElementNode TemplElementExpression
templElementNode, ok, err = templElementExpression.Parse(pi)
if err != nil {
return
}
if ok {
op = append(op, templElementNode)
continue
}
// Try for a children element expression.
// { children... }
var childrenExpressionNode ChildrenExpression
childrenExpressionNode, ok, err = childrenExpression.Parse(pi)
if err != nil {
return
}
if ok {
op = append(op, childrenExpressionNode)
continue
}
// Try for a string expression.
// { "abc" }
// { strings.ToUpper("abc") }
var stringExpressionNode StringExpression
stringExpressionNode, ok, err = stringExpression.Parse(pi)
if err != nil {
return
}
if ok {
op = append(op, stringExpressionNode)
continue
}
// Eat any whitespace.
var ws string
if ws, ok, err = parse.OptionalWhitespace.Parse(pi); err != nil || !ok {
return
}
if ok && len(ws) > 0 {
op = append(op, Whitespace{Value: ws})
continue
}
// Try for text.
// anything & everything accepted...
var text Text
if text, ok, err = textParser.Parse(pi); err != nil {
return
}
if ok && len(text.Value) > 0 {
op = append(op, text)
continue
}
if p.until == nil {
// In this case, we're just reading as many nodes as we can until we can't read any more.
// If we've reached here, we couldn't find a node.
// The element parser checks the final node returned to make sure it's the expected close tag.
break
}
err = fmt.Errorf("%v not found", p.untilName)
return
}
return op, true, nil
}