mirror of
https://github.com/osmarks/mycorrhiza.git
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183 lines
4.4 KiB
Go
183 lines
4.4 KiB
Go
package markup
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import (
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"fmt"
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"html"
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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 markup 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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// Temporaries
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img Img
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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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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 markup 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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// Process empty lines depending on the current state
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if "" == strings.TrimSpace(line) {
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switch state.where {
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case "list":
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state.where = ""
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addLine(state.buf + "</ul>")
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case "number":
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state.where = ""
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addLine(state.buf + "</ol>")
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case "pre":
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state.buf += "\n"
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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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addHeading := func(i int) {
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addLine(fmt.Sprintf("<h%d id='%d'>%s</h%d>", i, state.id, ParagraphToHtml(state.name, line[i+1:]), i))
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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 "img":
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goto imgState
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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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case "number":
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goto numberState
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default:
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goto normalState
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}
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imgState:
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if shouldGoBackToNormal := state.img.Process(line); shouldGoBackToNormal {
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state.where = ""
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addLine(state.img)
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}
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return
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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", ParagraphToHtml(state.name, line[2:]))
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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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numberState:
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switch {
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case startsWith("*. "):
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state.buf += fmt.Sprintf("\t<li>%s</li>\n", ParagraphToHtml(state.name, line[3:]))
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case startsWith("```"):
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state.where = "pre"
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addLine(state.buf + "</ol>")
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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 + "</ol>")
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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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state.where = "number"
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state.buf = fmt.Sprintf("<ol id='%d'>\n", state.id)
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goto numberState
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case startsWith("###### "):
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addHeading(6)
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case startsWith("##### "):
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addHeading(5)
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case startsWith("#### "):
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addHeading(4)
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case startsWith("### "):
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addHeading(3)
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case startsWith("## "):
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addHeading(2)
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case startsWith("# "):
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addHeading(1)
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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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href, text, class := Rocketlink(line, state.name)
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addLine(fmt.Sprintf(
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`<p><a id='%d' class='rocketlink %s' href="%s">%s</a></p>`, state.id, class, href, text))
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case startsWith("<="):
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addLine(parseTransclusion(line, state.name))
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case line == "----":
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*ast = append(*ast, Line{id: -1, contents: "<hr/>"})
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case MatchesImg(line):
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state.where = "img"
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state.img = ImgFromFirstLine(line, state.name)
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default:
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addLine(fmt.Sprintf("<p id='%d'>%s</p>", state.id, ParagraphToHtml(state.name, line)))
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}
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}
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