mirror of
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174 lines
4.4 KiB
Go
174 lines
4.4 KiB
Go
package gemtext
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import (
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"fmt"
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"html"
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"path"
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"strings"
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)
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// HyphaExists holds function that checks that a hypha is present.
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var HyphaExists func(string) bool
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// HyphaAccess holds function that accesses a hypha by its name.
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var HyphaAccess func(string) (rawText, binaryHtml string, err error)
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// GemLexerState is used by gemtext parser to remember what is going on.
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type GemLexerState struct {
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// Name of hypha being parsed
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name string
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where string // "", "list", "pre"
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// Line id
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id int
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buf string
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}
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type Line struct {
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id int
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// interface{} may be bad. What I need is a sum of string and Transclusion
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contents interface{}
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}
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// Parse gemtext line starting with "=>" according to wikilink rules.
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// See http://localhost:1737/page/wikilink
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func wikilink(src string, state *GemLexerState) (href, text, class string) {
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src = strings.TrimSpace(remover("=>")(src))
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if src == "" {
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return
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}
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// Href is text after => till first whitespace
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href = strings.Fields(src)[0]
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// Text is everything after whitespace.
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// If there's no text, make it same as href
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if text = strings.TrimPrefix(src, href); text == "" {
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text = href
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}
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class = "wikilink_internal"
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switch {
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case strings.HasPrefix(href, "./"):
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hyphaName := canonicalName(path.Join(
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state.name, strings.TrimPrefix(href, "./")))
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if !HyphaExists(hyphaName) {
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class = "wikilink_new"
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}
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href = path.Join("/page", hyphaName)
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case strings.HasPrefix(href, "../"):
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hyphaName := canonicalName(path.Join(
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path.Dir(state.name), strings.TrimPrefix(href, "../")))
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if !HyphaExists(hyphaName) {
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class = "wikilink_new"
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}
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href = path.Join("/page", hyphaName)
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case strings.HasPrefix(href, "/"):
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case strings.ContainsRune(href, ':'):
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class = "wikilink_external"
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default:
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href = path.Join("/page", href)
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}
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return href, strings.TrimSpace(text), class
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}
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func lex(name, content string) (ast []Line) {
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var state = GemLexerState{name: name}
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for _, line := range append(strings.Split(content, "\n"), "") {
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geminiLineToAST(line, &state, &ast)
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}
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return ast
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}
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// Lex `line` in gemtext and save it to `ast` using `state`.
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func geminiLineToAST(line string, state *GemLexerState, ast *[]Line) {
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addLine := func(text interface{}) {
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*ast = append(*ast, Line{id: state.id, contents: text})
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}
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if "" == strings.TrimSpace(line) {
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if state.where == "list" {
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state.where = ""
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addLine(state.buf + "</ul>")
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}
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return
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}
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startsWith := func(token string) bool {
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return strings.HasPrefix(line, token)
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}
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// Beware! Usage of goto. Some may say it is considered evil but in this case it helped to make a better-structured code.
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switch state.where {
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case "pre":
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goto preformattedState
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case "list":
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goto listState
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default:
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goto normalState
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}
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preformattedState:
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switch {
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case startsWith("```"):
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state.where = ""
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state.buf = strings.TrimSuffix(state.buf, "\n")
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addLine(state.buf + "</code></pre>")
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state.buf = ""
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default:
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state.buf += html.EscapeString(line) + "\n"
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}
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return
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listState:
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switch {
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case startsWith("*"):
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state.buf += fmt.Sprintf("\t<li>%s</li>\n", remover("*")(line))
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case startsWith("```"):
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state.where = "pre"
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addLine(state.buf + "</ul>")
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state.id++
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state.buf = fmt.Sprintf("<pre id='%d' alt='%s' class='codeblock'><code>", state.id, strings.TrimPrefix(line, "```"))
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default:
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state.where = ""
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addLine(state.buf + "</ul>")
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goto normalState
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}
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return
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normalState:
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state.id++
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switch {
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case startsWith("```"):
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state.where = "pre"
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state.buf = fmt.Sprintf("<pre id='%d' alt='%s' class='codeblock'><code>", state.id, strings.TrimPrefix(line, "```"))
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case startsWith("*"):
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state.where = "list"
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state.buf = fmt.Sprintf("<ul id='%d'>\n", state.id)
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goto listState
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case startsWith("###"):
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addLine(fmt.Sprintf(
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"<h3 id='%d'>%s</h3>", state.id, removeHeadingOctothorps(line)))
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case startsWith("##"):
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addLine(fmt.Sprintf(
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"<h2 id='%d'>%s</h2>", state.id, removeHeadingOctothorps(line)))
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case startsWith("#"):
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addLine(fmt.Sprintf(
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"<h1 id='%d'>%s</h1>", state.id, removeHeadingOctothorps(line)))
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case startsWith(">"):
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addLine(fmt.Sprintf(
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"<blockquote id='%d'>%s</blockquote>", state.id, remover(">")(line)))
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case startsWith("=>"):
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source, content, class := wikilink(line, state)
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addLine(fmt.Sprintf(
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`<p><a id='%d' class='%s' href="%s">%s</a></p>`, state.id, class, source, content))
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case startsWith("<="):
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addLine(parseTransclusion(line, state.name))
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default:
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addLine(fmt.Sprintf("<p id='%d'>%s</p>", state.id, line))
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}
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}
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