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package mardown
import (
"errors"
"fmt"
"html/template"
)
var (
ErrInvalidParagraph = errors.New("invalid paragraph")
)
type astParagraph struct {
content []block
oneLine bool
}
func (a *astParagraph) Eval() (template.HTML, error) {
var content template.HTML
for _, c := range a.content {
ct, err := c.Eval()
if err != nil {
return "", err
}
content += ct
}
if a.oneLine {
return content, nil
}
return template.HTML(fmt.Sprintf("<p>%s</p>", trimSpace(content))), nil
}
func paragraph(lxs *lexers, oneLine bool) (*astParagraph, error) {
tree := new(astParagraph)
tree.oneLine = oneLine
maxBreak := 2
if oneLine {
maxBreak = 1
}
n := 0
lxs.current-- // because we do not use it before the next
for lxs.Next() && n < maxBreak {
switch lxs.Current().Type {
case lexerBreak:
n = len(lxs.Current().Value)
case lexerQuote, lexerList:
if n > 0 {
lxs.Before() // because we did not use it
return tree, nil
}
tree.content = append(tree.content, astLiteral(lxs.Current().Value))
case lexerLiteral, lexerHeader:
s := lxs.Current().Value
// replace line break by space
if n > 0 {
s = " " + s
}
n = 0
tree.content = append(tree.content, astLiteral(s))
case lexerModifier:
n = 0
mod, err := modifier(lxs)
if err != nil {
return nil, err
}
tree.content = append(tree.content, mod)
case lexerExternal:
n = 0
if lxs.Current().Value == "!" {
tree.content = append(tree.content, astLiteral(lxs.Current().Value))
} else {
ext, err := external(lxs)
if err != nil {
return nil, err
}
tree.content = append(tree.content, ext)
}
case lexerCode:
n = 0
b, err := code(lxs)
if err != nil {
return nil, err
}
tree.content = append(tree.content, b)
return tree, nil
}
}
if !lxs.Finished() {
lxs.Before() // because we never handle the last item
}
return tree, nil
}
type astLiteral string
func (a astLiteral) Eval() (template.HTML, error) {
return template.HTML(template.HTMLEscapeString(string(a))), nil
}
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