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goparser.go
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goparser.go
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package parser
import (
"fmt"
"strings"
"github.com/a-h/parse"
"github.com/a-h/templ/parser/v2/goexpression"
)
func parseGoFuncDecl(prefix string, pi *parse.Input) (name string, expression Expression, err error) {
prefix = prefix + " "
from := pi.Index()
src, _ := pi.Peek(-1)
src = strings.TrimPrefix(src, prefix)
name, expr, err := goexpression.Func("func " + src)
if err != nil {
return name, expression, parse.Error(fmt.Sprintf("invalid %s declaration: %v", prefix, err.Error()), pi.Position())
}
pi.Take(len(prefix) + len(expr))
to := pi.Position()
return name, NewExpression(expr, pi.PositionAt(from+len(prefix)), to), nil
}
func parseTemplFuncDecl(pi *parse.Input) (name string, expression Expression, err error) {
return parseGoFuncDecl("templ", pi)
}
func parseCSSFuncDecl(pi *parse.Input) (name string, expression Expression, err error) {
return parseGoFuncDecl("css", pi)
}
func parseGoSliceArgs(pi *parse.Input) (r Expression, err error) {
from := pi.Position()
src, _ := pi.Peek(-1)
expr, err := goexpression.SliceArgs(src)
if err != nil {
return r, err
}
pi.Take(len(expr))
to := pi.Position()
return NewExpression(expr, from, to), nil
}
func peekPrefix(pi *parse.Input, prefixes ...string) bool {
for _, prefix := range prefixes {
pp, ok := pi.Peek(len(prefix))
if !ok {
continue
}
if prefix == pp {
return true
}
}
return false
}
type extractor func(content string) (start, end int, err error)
func parseGo(name string, pi *parse.Input, e extractor) (r Expression, err error) {
from := pi.Index()
src, _ := pi.Peek(-1)
start, end, err := e(src)
if err != nil {
return r, parse.Error(fmt.Sprintf("%s: invalid go expression: %v", name, err.Error()), pi.Position())
}
expr := src[start:end]
pi.Take(end)
return NewExpression(expr, pi.PositionAt(from+start), pi.PositionAt(from+end)), nil
}