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107 lines
3.0 KiB
Go
107 lines
3.0 KiB
Go
package gemtext
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import (
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"fmt"
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"path"
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"strconv"
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"strings"
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)
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const xclError = -9
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// Transclusion is used by gemtext parser to remember what hyphae shall be transcluded.
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type Transclusion struct {
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name string
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from int // inclusive
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to int // inclusive
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}
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// Transclude transcludes `xcl` and returns html representation.
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func Transclude(xcl Transclusion, state GemParserState) (html string) {
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state.recursionLevel++
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tmptOk := `<section class="transclusion transclusion_ok">
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<a class="transclusion__link" href="/page/%s">%s</a>
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<div class="transclusion__content">%s</div>
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</section>`
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tmptFailed := `<section class="transclusion transclusion_failed">
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<p>Failed to transclude <a href="/page/%s">%s</a></p>
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</section>`
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if xcl.from == xclError || xcl.to == xclError || xcl.from > xcl.to {
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return fmt.Sprintf(tmptFailed, xcl.name, xcl.name)
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}
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rawText, binaryHtml, err := HyphaAccess(xcl.name)
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if err != nil {
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return fmt.Sprintf(tmptFailed, xcl.name, xcl.name)
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}
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xclText := Parse(lex(xcl.name, rawText), xcl.from, xcl.to, state)
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return fmt.Sprintf(tmptOk, xcl.name, xcl.name, binaryHtml+xclText)
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}
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/* Grammar from hypha ‘transclusion’:
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transclusion_line ::= transclusion_token hypha_name LWS* [":" LWS* range LWS*]
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transclusion_token ::= "<=" LWS+
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hypha_name ::= canonical_name | noncanonical_name
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range ::= id | (from_id two_dots to_id) | (from_id two_dots) | (two_dots to_id)
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two_dots ::= ".."
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*/
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func parseTransclusion(line, hyphaName string) (xclusion Transclusion) {
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line = strings.TrimSpace(remover("<=")(line))
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if line == "" {
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return Transclusion{"", xclError, xclError}
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}
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if strings.ContainsRune(line, ':') {
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parts := strings.SplitN(line, ":", 2)
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xclusion.name = xclCanonicalName(hyphaName, strings.TrimSpace(parts[0]))
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selector := strings.TrimSpace(parts[1])
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xclusion.from, xclusion.to = parseSelector(selector)
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} else {
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xclusion.name = xclCanonicalName(hyphaName, strings.TrimSpace(line))
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}
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return xclusion
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}
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func xclCanonicalName(hyphaName, xclName string) string {
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switch {
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case strings.HasPrefix(xclName, "./"):
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return canonicalName(path.Join(hyphaName, strings.TrimPrefix(xclName, "./")))
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case strings.HasPrefix(xclName, "../"):
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return canonicalName(path.Join(path.Dir(hyphaName), strings.TrimPrefix(xclName, "../")))
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default:
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return canonicalName(xclName)
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}
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}
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// At this point:
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// selector ::= id
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// | from ".."
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// | from ".." to
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// | ".." to
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// If it is not, return (xclError, xclError).
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func parseSelector(selector string) (from, to int) {
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if selector == "" {
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return 0, 0
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}
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if strings.Contains(selector, "..") {
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parts := strings.Split(selector, "..")
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var (
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fromStr = strings.TrimSpace(parts[0])
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from, fromErr = strconv.Atoi(fromStr)
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toStr = strings.TrimSpace(parts[1])
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to, toErr = strconv.Atoi(toStr)
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)
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if fromStr == "" && toStr == "" {
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return 0, 0
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}
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if fromErr == nil || toErr == nil {
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return from, to
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}
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} else if id, err := strconv.Atoi(selector); err == nil {
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return id, id
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}
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return xclError, xclError
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}
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