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templelementparser.go
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/
templelementparser.go
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package parser
import (
"fmt"
"unicode"
"github.com/a-h/parse"
)
var templElementStartExpressionParams = parse.StringFrom(
parse.String("("),
parse.StringFrom[Expression](functionArgsParser{
startBracketCount: 1,
}),
parse.String(")"),
)
var templElementStartExpression = ExpressionOf(parse.StringFrom(
parse.AtLeast(1, parse.StringFrom(
parse.StringFrom(parse.Optional(parse.String("."))),
parse.StringFrom(parse.Optional(parse.String("_"))),
parse.RuneInRanges(unicode.Letter),
parse.StringFrom(parse.AtMost(255, parse.RuneInRanges(unicode.Letter, unicode.Number))),
parse.StringFrom(parse.Optional(templElementStartExpressionParams)),
)),
))
type templElementExpressionParser struct{}
func (p templElementExpressionParser) Parse(pi *parse.Input) (n Node, ok bool, err error) {
// Check the prefix first.
if _, ok, err = parse.Rune('@').Parse(pi); err != nil || !ok {
return
}
// Parse the identifier.
var r TemplElementExpression
if r.Expression, ok, err = Must(templElementStartExpression, "templ element: found start '@' but expression was not closed").Parse(pi); err != nil || !ok {
return
}
// Once we've got a start expression, check to see if there's an open brace for children. {\n.
var hasOpenBrace bool
_, hasOpenBrace, err = openBraceWithOptionalPadding.Parse(pi)
if err != nil {
return
}
if !hasOpenBrace {
return r, true, nil
}
// Once we've had the start of an element's children, we must conclude the block.
// Node contents.
np := newTemplateNodeParser(closeBraceWithOptionalPadding, "templ element closing brace")
if r.Children, ok, err = Must[[]Node](np, fmt.Sprintf("@%s: expected nodes, but none were found", r.Expression.Value)).Parse(pi); err != nil || !ok {
return
}
// Read the required closing brace.
if _, ok, err = Must(closeBraceWithOptionalPadding, fmt.Sprintf("@%s: missing end (expected '}')", r.Expression.Value)).Parse(pi); err != nil || !ok {
return
}
return r, true, nil
}
var templElementExpression templElementExpressionParser