Initial project import
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// Copyright 2026 The V Language. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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module markdown
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import encoding.html as ehtml
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// parse_inline parses src as inline content and returns a slice of inline nodes.
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pub fn parse_inline(src string, opts Options, ref_map map[string]LinkRef) []&Node {
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mut p := InlineParser{
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src: src
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opts: opts
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ref_map: ref_map
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}
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return p.parse()
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}
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// InlineParser parses inline markdown content.
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struct InlineParser {
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opts Options
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ref_map map[string]LinkRef
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mut:
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src string
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pos int
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}
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struct EmphDelim {
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mut:
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node_idx int
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ch u8
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length int
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orig_len int
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can_open bool
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can_close bool
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active bool = true
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}
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@[inline]
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fn rune_at_or_space(s string, pos int) rune {
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if pos < 0 || pos >= s.len {
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return ` `
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}
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char_len := utf8_char_len(s[pos])
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if char_len <= 0 || pos + char_len > s.len {
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return rune(s[pos])
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}
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return s[pos..pos + char_len].runes()[0]
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}
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@[inline]
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fn prev_rune_or_space(s string, pos int) rune {
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if pos <= 0 {
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return ` `
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}
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mut i := pos - 1
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for i > 0 && (s[i] & u8(0xC0)) == u8(0x80) {
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i--
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}
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return rune_at_or_space(s, i)
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}
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// parse parses the full inline source and returns a node slice.
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fn (mut p InlineParser) parse() []&Node {
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mut result := []&Node{}
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mut delims := []EmphDelim{}
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for p.pos < p.src.len {
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if p.src[p.pos] == `*` || p.src[p.pos] == `_` {
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start := p.pos
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ch := p.src[p.pos]
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for p.pos < p.src.len && p.src[p.pos] == ch {
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p.pos++
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}
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run := p.src[start..p.pos]
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before := prev_rune_or_space(p.src, start)
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after := rune_at_or_space(p.src, p.pos)
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can_open := can_open_emphasis(ch, before, after)
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can_close := can_close_emphasis(ch, before, after)
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result << text_node(run)
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if can_open || can_close {
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delims << EmphDelim{
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node_idx: result.len - 1
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ch: ch
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length: run.len
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orig_len: run.len
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can_open: can_open
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can_close: can_close
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}
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}
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continue
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}
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nodes := p.parse_one()
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for n in nodes {
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result << n
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}
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}
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if delims.len > 0 {
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resolve_emphasis(mut result, mut delims)
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result = compact_empty_text_nodes(result)
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}
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return merge_text_nodes(result)
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}
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fn resolve_emphasis(mut nodes []&Node, mut delims []EmphDelim) {
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mut i := 0
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for i < delims.len {
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if !delims[i].active || !delims[i].can_close || delims[i].length == 0 {
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i++
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continue
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}
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mut opener := i - 1
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for opener >= 0 {
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if !delims[opener].active || !delims[opener].can_open || delims[opener].length == 0 {
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opener--
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continue
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}
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if delims[opener].ch != delims[i].ch {
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opener--
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continue
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}
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if (delims[i].can_open || delims[opener].can_close)
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&& (delims[opener].orig_len + delims[i].orig_len) % 3 == 0
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&& (delims[opener].orig_len % 3 != 0 || delims[i].orig_len % 3 != 0) {
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opener--
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continue
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}
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if delims[opener].node_idx + 1 >= delims[i].node_idx {
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opener--
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continue
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}
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break
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}
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if opener < 0 {
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i++
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continue
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}
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use_len := if delims[opener].length >= 2 && delims[i].length >= 2 { 2 } else { 1 }
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opener_idx := delims[opener].node_idx
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closer_idx := delims[i].node_idx
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if opener_idx < 0 || closer_idx < 0 || opener_idx >= nodes.len || closer_idx >= nodes.len
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|| opener_idx >= closer_idx {
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delims[i].active = false
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i++
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continue
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}
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if nodes[opener_idx].literal.len < use_len || nodes[closer_idx].literal.len < use_len {
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delims[i].active = false
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i++
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continue
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}
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nodes[opener_idx].literal = nodes[opener_idx].literal[..nodes[opener_idx].literal.len - use_len]
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nodes[closer_idx].literal = nodes[closer_idx].literal[use_len..]
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delims[opener].length -= use_len
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delims[i].length -= use_len
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mut emph := new_node(if use_len == 2 { .strong } else { .emphasis })
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for child_idx in opener_idx + 1 .. closer_idx {
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emph.append_child(nodes[child_idx])
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}
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n_inner := closer_idx - opener_idx - 1
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if n_inner > 0 {
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nodes.delete_many(opener_idx + 1, n_inner)
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nodes.insert(opener_idx + 1, emph)
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}
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mut delta := n_inner - 1
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if delta < 0 {
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delta = 0
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}
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for j := 0; j < delims.len; j++ {
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if !delims[j].active {
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continue
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}
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if delims[j].node_idx > opener_idx && delims[j].node_idx < closer_idx {
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delims[j].active = false
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continue
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}
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if delta > 0 && delims[j].node_idx >= closer_idx {
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delims[j].node_idx -= delta
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}
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}
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if delims[opener].length == 0 {
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delims[opener].can_open = false
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}
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if delims[i].length == 0 {
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delims[i].can_close = false
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}
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i = opener + 1
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}
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}
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fn compact_empty_text_nodes(nodes []&Node) []&Node {
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mut out := []&Node{}
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for n in nodes {
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if n.kind == .text && n.literal.len == 0 {
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continue
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}
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out << n
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}
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return out
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}
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// parse_one parses one or more inline elements at the current position.
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fn (mut p InlineParser) parse_one() []&Node {
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if p.pos >= p.src.len {
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return []
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}
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c := p.src[p.pos]
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match c {
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`\\` {
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return [p.parse_backslash()]
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}
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96 { // backtick
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if node := p.try_code_span() {
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return [node]
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}
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p.pos++
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return [text_node('`')]
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}
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`*`, `_` {
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p.pos++
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return [text_node(c.ascii_str())]
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}
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`~` {
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if p.opts.strikethrough {
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if node := p.try_strikethrough() {
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return [node]
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}
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}
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p.pos++
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return [text_node('~')]
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}
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`[` {
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if nodes := p.try_link_or_footnote() {
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return nodes
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}
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p.pos++
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return [text_node('[')]
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}
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`!` {
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if p.pos + 1 < p.src.len && p.src[p.pos + 1] == `[` {
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saved := p.pos
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p.pos += 2
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if nodes := p.try_image_after_bang() {
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return nodes
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}
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p.pos = saved
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p.pos++
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return [text_node('!')]
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}
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p.pos++
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return [text_node('!')]
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}
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`<` {
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if node := p.try_autolink_or_html() {
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return [node]
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}
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p.pos++
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return [text_node('<')]
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}
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`&` {
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if node := p.try_entity() {
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return [node]
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}
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p.pos++
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return [text_node('&')]
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}
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`\n` {
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return [p.parse_newline()]
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}
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else {
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r := rune_at_or_space(p.src, p.pos)
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step := utf8_char_len(p.src[p.pos])
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if p.opts.linkify {
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if node := p.try_linkify() {
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return [node]
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}
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}
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p.pos += step
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return [text_node(r.str())]
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}
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}
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}
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// text_node creates a text node with the given literal string.
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fn text_node(s string) &Node {
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mut n := new_node(.text)
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n.literal = s
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return n
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}
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// merge_text_nodes merges consecutive text nodes into one.
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fn merge_text_nodes(nodes []&Node) []&Node {
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if nodes.len <= 1 {
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return nodes
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}
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mut result := []&Node{}
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for node in nodes {
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if result.len > 0 && result[result.len - 1].kind == .text && node.kind == .text {
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result[result.len - 1].literal += node.literal
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} else {
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result << node
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}
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}
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return result
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}
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// can_open_emphasis reports whether a delimiter run can open emphasis.
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fn can_open_emphasis(delim u8, before rune, after rune) bool {
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left_flanking := !is_unicode_space(after) && (!is_ascii_punct(after) || is_unicode_space(before)
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|| is_ascii_punct(before))
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right_flanking := !is_unicode_space(before)
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&& (!is_ascii_punct(before) || is_unicode_space(after)
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|| is_ascii_punct(after))
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if delim == `*` {
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return left_flanking
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}
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if delim == `_` {
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return left_flanking && (!right_flanking || is_ascii_punct(before))
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}
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return false
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}
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// can_close_emphasis reports whether a delimiter run can close emphasis.
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fn can_close_emphasis(delim u8, before rune, after rune) bool {
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left_flanking := !is_unicode_space(after) && (!is_ascii_punct(after) || is_unicode_space(before)
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|| is_ascii_punct(before))
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right_flanking := !is_unicode_space(before)
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&& (!is_ascii_punct(before) || is_unicode_space(after)
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|| is_ascii_punct(after))
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if delim == `*` {
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return right_flanking
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}
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if delim == `_` {
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return right_flanking && (!left_flanking || is_ascii_punct(after))
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}
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return false
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}
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// parse_backslash handles backslash escapes and hard line breaks.
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fn (mut p InlineParser) parse_backslash() &Node {
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p.pos++ // consume '\'
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if p.pos >= p.src.len {
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return text_node('\\')
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}
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ch := p.src[p.pos]
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if ch == `\n` {
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p.pos++
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return new_node(.hard_break)
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}
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if is_ascii_punct(ch) {
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p.pos++
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return text_node(ch.ascii_str())
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}
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return text_node('\\')
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}
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// try_code_span attempts to parse a backtick code span.
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fn (mut p InlineParser) try_code_span() ?&Node {
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start := p.pos
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mut n := 0
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for p.pos < p.src.len && p.src[p.pos] == 96 {
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n++
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p.pos++
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}
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content_start := p.pos
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mut search := content_start
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for search < p.src.len {
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if p.src[search] == 96 {
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close_start := search
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mut close_n := 0
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for search < p.src.len && p.src[search] == 96 {
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close_n++
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search++
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}
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if close_n == n {
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code_raw := p.src[content_start..close_start]
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mut code := code_raw.replace('\n', ' ')
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if code.len >= 2 && code[0] == ` ` && code[code.len - 1] == ` `
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&& code.trim_space().len > 0 {
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code = code[1..code.len - 1]
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}
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mut node := new_node(.code_span)
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node.literal = code
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p.pos = search
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return node
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}
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} else {
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search++
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}
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}
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p.pos = start
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return none
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}
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// try_emphasis attempts to parse *em*, **strong**, _em_, __strong__.
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fn (mut p InlineParser) try_emphasis(c u8) ?&Node {
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start := p.pos
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mut run := 0
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for p.pos < p.src.len && p.src[p.pos] == c {
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run++
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p.pos++
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}
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// Prevent splitting an intraword __ run into a synthetic single-underscore opener.
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if c == `_` && run == 1 && start > 1 && p.src[start - 1] == `_` {
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before2 := prev_rune_or_space(p.src, start - 1)
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after1 := rune_at_or_space(p.src, start + run)
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if is_wordish(before2) && is_wordish(after1) {
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p.pos = start
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return none
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}
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}
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before := prev_rune_or_space(p.src, start)
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after := rune_at_or_space(p.src, start + run)
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opener_can_open := can_open_emphasis(c, before, after)
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opener_can_close := can_close_emphasis(c, before, after)
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if !opener_can_open {
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p.pos = start
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return none
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}
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// Prefer em first for odd runs (e.g. ***foo*** -> <em><strong>foo</strong></em>).
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if run % 2 == 1 {
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p.pos = start + 1
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if node := p.match_close_delim(c, 1, run, opener_can_close) {
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return node
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}
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if run >= 2 {
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p.pos = start + 2
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if node := p.match_close_delim(c, 2, run, opener_can_close) {
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return node
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}
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}
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} else {
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if run >= 2 {
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p.pos = start + 2
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if node := p.match_close_delim(c, 2, run, opener_can_close) {
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return node
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}
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}
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p.pos = start + 1
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if node := p.match_close_delim(c, 1, run, opener_can_close) {
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return node
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}
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}
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p.pos = start
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return none
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}
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// is_wordish reports whether c behaves like a word character for emphasis
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// boundary checks (includes non-ASCII bytes used in UTF-8 sequences).
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@[inline]
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fn is_wordish(c rune) bool {
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return !is_unicode_space(c) && !is_ascii_punct(c)
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}
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// match_close_delim parses content after the opening delimiter run and finds
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// a matching closing delimiter of exactly `count` characters.
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fn (mut p InlineParser) match_close_delim(c u8, count int, opener_run int, opener_can_close bool) ?&Node {
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content_start := p.pos
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mut content_nodes := []&Node{}
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for p.pos < p.src.len {
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loop_start_pos := p.pos
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ch := p.src[p.pos]
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// Check for closing delimiter.
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if ch == c {
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close_pos := p.pos
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mut close_run := 0
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for p.pos < p.src.len && p.src[p.pos] == c {
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close_run++
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p.pos++
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}
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if close_run >= count {
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// Verify right-flanking.
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before_close := prev_rune_or_space(p.src, close_pos)
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after_close := rune_at_or_space(p.src, p.pos)
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closer_can_close := can_close_emphasis(c, before_close, after_close)
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closer_can_open := can_open_emphasis(c, before_close, after_close)
|
||||
if closer_can_close {
|
||||
if count == 1 && opener_run == 1 && close_run > 1 && closer_can_open {
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p.pos = close_pos
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} else if count == 1 && opener_run > 1 && close_run > 1 && closer_can_open {
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||||
// Keep extra delimiters inside the emphasis span so nested
|
||||
// strong parsing can consume them (e.g. foo***bar***baz).
|
||||
inner_end := close_pos + (close_run - count)
|
||||
if inner_end > content_start && inner_end <= p.src.len {
|
||||
inner_nodes := parse_inline(p.src[content_start..inner_end], p.opts,
|
||||
p.ref_map)
|
||||
mut node := new_node(.emphasis)
|
||||
for child in inner_nodes {
|
||||
node.append_child(child)
|
||||
}
|
||||
p.pos = close_pos + close_run
|
||||
return node
|
||||
}
|
||||
} else {
|
||||
if opener_can_close && closer_can_open && (opener_run + close_run) % 3 == 0
|
||||
&& (opener_run % 3 != 0 || close_run % 3 != 0) {
|
||||
p.pos = close_pos
|
||||
} else {
|
||||
if content_nodes.len == 0 {
|
||||
content_nodes << text_node(c.ascii_str())
|
||||
p.pos = close_pos + 1
|
||||
continue
|
||||
}
|
||||
// Rewind extra closing chars beyond `count`.
|
||||
p.pos = close_pos + count
|
||||
kind := if count == 2 { NodeKind.strong } else { NodeKind.emphasis }
|
||||
mut node := new_node(kind)
|
||||
for child in content_nodes {
|
||||
node.append_child(child)
|
||||
}
|
||||
return node
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
p.pos = close_pos
|
||||
if count == 1 && opener_run > 1 && opener_can_close {
|
||||
content_nodes << text_node(c.ascii_str())
|
||||
p.pos++
|
||||
continue
|
||||
}
|
||||
}
|
||||
if ch == `\n` {
|
||||
// Newlines stop emphasis search.
|
||||
break
|
||||
}
|
||||
inner := p.parse_one()
|
||||
if p.pos <= loop_start_pos {
|
||||
// Safety net: force progress to avoid recursive delimiter stalls.
|
||||
fallback := rune_at_or_space(p.src, loop_start_pos)
|
||||
content_nodes << text_node(fallback.str())
|
||||
p.pos = loop_start_pos + utf8_char_len(p.src[loop_start_pos])
|
||||
continue
|
||||
}
|
||||
content_nodes << inner
|
||||
}
|
||||
|
||||
// Not found; reset.
|
||||
p.pos = content_start
|
||||
return none
|
||||
}
|
||||
|
||||
// try_strikethrough parses ~~text~~.
|
||||
fn (mut p InlineParser) try_strikethrough() ?&Node {
|
||||
if p.pos + 1 >= p.src.len || p.src[p.pos + 1] != `~` {
|
||||
return none
|
||||
}
|
||||
p.pos += 2
|
||||
close := p.src.index_after_('~~', p.pos)
|
||||
if close < 0 {
|
||||
p.pos -= 2
|
||||
return none
|
||||
}
|
||||
inner := p.src[p.pos..close]
|
||||
inner_nodes := parse_inline(inner, p.opts, p.ref_map)
|
||||
mut node := new_node(.strikethrough)
|
||||
for child in inner_nodes {
|
||||
node.append_child(child)
|
||||
}
|
||||
p.pos = close + 2
|
||||
return node
|
||||
}
|
||||
|
||||
// try_link_or_footnote handles [ and attempts to parse a link or footnote ref.
|
||||
fn (mut p InlineParser) try_link_or_footnote() ?[]&Node {
|
||||
saved := p.pos
|
||||
p.pos++ // consume '['
|
||||
// Footnote reference [^label].
|
||||
if p.opts.footnotes && p.pos < p.src.len && p.src[p.pos] == `^` {
|
||||
fn_start := p.pos + 1
|
||||
fn_close := p.src.index_after_(']', fn_start)
|
||||
if fn_close > fn_start {
|
||||
label := p.src[fn_start..fn_close]
|
||||
mut fn_ref := new_node(.footnote_ref)
|
||||
fn_ref.fn_label = label
|
||||
p.pos = fn_close + 1
|
||||
return [fn_ref]
|
||||
}
|
||||
}
|
||||
text_start := p.pos
|
||||
close := find_bracket_close(p.src, p.pos)
|
||||
if close < 0 {
|
||||
p.pos = saved
|
||||
return none
|
||||
}
|
||||
link_text := p.src[text_start..close]
|
||||
p.pos = close + 1
|
||||
|
||||
// Inline link (url).
|
||||
if p.pos < p.src.len && p.src[p.pos] == `(` {
|
||||
dest, title, end := parse_inline_link_dest_from(p.src, p.pos + 1)
|
||||
if end >= 0 {
|
||||
inner_nodes := parse_inline(link_text, p.opts, p.ref_map)
|
||||
mut node := new_node(.link)
|
||||
node.dest = unescape_string(dest)
|
||||
node.title = unescape_string(title)
|
||||
for child in inner_nodes {
|
||||
node.append_child(child)
|
||||
}
|
||||
p.pos = end + 1
|
||||
return [node]
|
||||
}
|
||||
}
|
||||
// Full reference [text][label].
|
||||
if p.pos < p.src.len && p.src[p.pos] == `[` {
|
||||
ref_start := p.pos + 1
|
||||
ref_close := p.src.index_after_(']', ref_start)
|
||||
if ref_close >= 0 {
|
||||
raw_label := p.src[ref_start..ref_close]
|
||||
label := normalize_label(if raw_label.len > 0 { raw_label } else { link_text })
|
||||
if label in p.ref_map {
|
||||
ref := p.ref_map[label]
|
||||
mut node := new_node(.link)
|
||||
node.dest = ref.dest
|
||||
node.title = ref.title
|
||||
node.label = label
|
||||
inner_nodes := parse_inline(link_text, p.opts, p.ref_map)
|
||||
for child in inner_nodes {
|
||||
node.append_child(child)
|
||||
}
|
||||
p.pos = ref_close + 1
|
||||
return [node]
|
||||
}
|
||||
if raw_label.len > 0 {
|
||||
// Do not downgrade explicit [text][label] to shortcut [text].
|
||||
p.pos = saved
|
||||
return none
|
||||
}
|
||||
}
|
||||
}
|
||||
// Shortcut reference [label].
|
||||
label := normalize_label(link_text)
|
||||
if label in p.ref_map {
|
||||
ref := p.ref_map[label]
|
||||
mut node := new_node(.link)
|
||||
node.dest = ref.dest
|
||||
node.title = ref.title
|
||||
node.label = label
|
||||
inner_nodes := parse_inline(link_text, p.opts, p.ref_map)
|
||||
for child in inner_nodes {
|
||||
node.append_child(child)
|
||||
}
|
||||
return [node]
|
||||
}
|
||||
p.pos = saved
|
||||
return none
|
||||
}
|
||||
|
||||
// try_image_after_bang parses the [alt](url) part of an image after '![' was consumed.
|
||||
fn (mut p InlineParser) try_image_after_bang() ?[]&Node {
|
||||
text_start := p.pos
|
||||
close := find_bracket_close(p.src, p.pos)
|
||||
if close < 0 {
|
||||
return none
|
||||
}
|
||||
alt_text := p.src[text_start..close]
|
||||
p.pos = close + 1
|
||||
|
||||
if p.pos < p.src.len && p.src[p.pos] == `(` {
|
||||
dest, title, end := parse_inline_link_dest_from(p.src, p.pos + 1)
|
||||
if end >= 0 {
|
||||
mut node := new_node(.image)
|
||||
node.dest = unescape_string(dest)
|
||||
node.title = unescape_string(title)
|
||||
inner_nodes := parse_inline(alt_text, p.opts, p.ref_map)
|
||||
for child in inner_nodes {
|
||||
node.append_child(child)
|
||||
}
|
||||
p.pos = end + 1
|
||||
return [node]
|
||||
}
|
||||
}
|
||||
if p.pos < p.src.len && p.src[p.pos] == `[` {
|
||||
ref_start := p.pos + 1
|
||||
ref_close := p.src.index_after_(']', ref_start)
|
||||
if ref_close >= 0 {
|
||||
raw_label := p.src[ref_start..ref_close]
|
||||
label := normalize_label(if raw_label.len > 0 { raw_label } else { alt_text })
|
||||
if label in p.ref_map {
|
||||
ref := p.ref_map[label]
|
||||
mut node := new_node(.image)
|
||||
node.dest = ref.dest
|
||||
node.title = ref.title
|
||||
inner_nodes := parse_inline(alt_text, p.opts, p.ref_map)
|
||||
for child in inner_nodes {
|
||||
node.append_child(child)
|
||||
}
|
||||
p.pos = ref_close + 1
|
||||
return [node]
|
||||
}
|
||||
}
|
||||
}
|
||||
return none
|
||||
}
|
||||
|
||||
// find_bracket_close finds the ] matching the [ at start, handling nesting and escapes.
|
||||
fn find_bracket_close(s string, start int) int {
|
||||
mut depth := 1
|
||||
mut i := start
|
||||
for i < s.len {
|
||||
if s[i] == `\\` && i + 1 < s.len {
|
||||
i += 2
|
||||
continue
|
||||
}
|
||||
if s[i] == `[` {
|
||||
depth++
|
||||
} else if s[i] == `]` {
|
||||
depth--
|
||||
if depth == 0 {
|
||||
return i
|
||||
}
|
||||
}
|
||||
i++
|
||||
}
|
||||
return -1
|
||||
}
|
||||
|
||||
// parse_inline_link_dest_from parses (url) or (url "title") starting at s[start]
|
||||
// (start is after the opening paren). Returns (dest, title, end_paren_pos) or ("","", -1).
|
||||
fn parse_inline_link_dest_from(s string, start int) (string, string, int) {
|
||||
i := skip_ws(s, start)
|
||||
if i >= s.len {
|
||||
return '', '', -1
|
||||
}
|
||||
dest, after_dest := parse_link_dest(s[i..])
|
||||
j := i + (s[i..].len - after_dest.len)
|
||||
k := skip_ws(s, j)
|
||||
if k < s.len && s[k] == `)` {
|
||||
return dest, '', k
|
||||
}
|
||||
title, after_title := parse_link_title(s[k..])
|
||||
l := k + (s[k..].len - after_title.len)
|
||||
m := skip_ws(s, l)
|
||||
if m < s.len && s[m] == `)` {
|
||||
return dest, title, m
|
||||
}
|
||||
return '', '', -1
|
||||
}
|
||||
|
||||
// skip_ws returns the position in s after skipping whitespace from start.
|
||||
fn skip_ws(s string, start int) int {
|
||||
mut i := start
|
||||
for i < s.len {
|
||||
ch := rune_at_or_space(s, i)
|
||||
if ch !in unicode_space {
|
||||
break
|
||||
}
|
||||
i += utf8_char_len(s[i])
|
||||
}
|
||||
return i
|
||||
}
|
||||
|
||||
// try_autolink_or_html handles <...> for autolinks and raw HTML.
|
||||
fn (mut p InlineParser) try_autolink_or_html() ?&Node {
|
||||
rest := p.src[p.pos..]
|
||||
auto_end := try_autolink(rest)
|
||||
if auto_end >= 0 {
|
||||
content := rest[1..auto_end]
|
||||
mut node := new_node(.autolink)
|
||||
node.literal = content
|
||||
if content.contains('@') && !content.contains('://') {
|
||||
node.dest = 'mailto:' + content
|
||||
} else {
|
||||
node.dest = content
|
||||
}
|
||||
p.pos += auto_end + 1
|
||||
return node
|
||||
}
|
||||
raw_end := try_raw_html_tag(rest)
|
||||
if raw_end >= 0 {
|
||||
mut node := new_node(.raw_html)
|
||||
node.literal = rest[..raw_end + 1]
|
||||
p.pos += raw_end + 1
|
||||
return node
|
||||
}
|
||||
return none
|
||||
}
|
||||
|
||||
// try_autolink matches an <autolink> returning the position of '>' or -1.
|
||||
fn try_autolink(s string) int {
|
||||
if s.len < 3 || s[0] != `<` {
|
||||
return -1
|
||||
}
|
||||
end := s.index_after_('>', 1)
|
||||
if end < 0 {
|
||||
return -1
|
||||
}
|
||||
inner := s[1..end]
|
||||
if inner.contains(' ') || inner.contains('<') {
|
||||
return -1
|
||||
}
|
||||
if inner.contains('://') {
|
||||
return end
|
||||
}
|
||||
if inner.contains('@') && !inner.starts_with('@') {
|
||||
return end
|
||||
}
|
||||
return -1
|
||||
}
|
||||
|
||||
// try_raw_html_tag matches a raw HTML tag starting with '<' and returns the '>' position.
|
||||
fn try_raw_html_tag(s string) int {
|
||||
if s.len < 3 || s[0] != `<` {
|
||||
return -1
|
||||
}
|
||||
if s.starts_with('<!--') {
|
||||
end := s.index_after_('-->', 4)
|
||||
if end >= 0 {
|
||||
return end + 2
|
||||
}
|
||||
return -1
|
||||
}
|
||||
if s.starts_with('<?') {
|
||||
end := s.index_after_('?>', 2)
|
||||
if end >= 0 {
|
||||
return end + 1
|
||||
}
|
||||
return -1
|
||||
}
|
||||
low := s.to_lower()
|
||||
if low.starts_with('<![cdata[') {
|
||||
end := s.index_after_(']]>', 9)
|
||||
if end >= 0 {
|
||||
return end + 2
|
||||
}
|
||||
return -1
|
||||
}
|
||||
end := s.index_after_('>', 1)
|
||||
if end < 0 {
|
||||
return -1
|
||||
}
|
||||
inner := s[1..end]
|
||||
if inner.len == 0 {
|
||||
return -1
|
||||
}
|
||||
if !is_alpha(inner[0]) && inner[0] != `/` && inner[0] != `!` {
|
||||
return -1
|
||||
}
|
||||
return end
|
||||
}
|
||||
|
||||
// try_entity parses an HTML entity reference &name; or &#n; or &#xn'
|
||||
fn (mut p InlineParser) try_entity() ?&Node {
|
||||
rest := p.src[p.pos..]
|
||||
semi := rest.index(';') or { return none }
|
||||
if semi > 32 || semi < 2 {
|
||||
return none
|
||||
}
|
||||
candidate := rest[..semi + 1]
|
||||
decoded := ehtml.unescape(candidate, all: true)
|
||||
if decoded == candidate {
|
||||
return none
|
||||
}
|
||||
p.pos += semi + 1
|
||||
return text_node(decoded)
|
||||
}
|
||||
|
||||
// parse_newline handles a newline character.
|
||||
fn (mut p InlineParser) parse_newline() &Node {
|
||||
// Hard break if preceded by two or more spaces.
|
||||
if p.pos >= 2 && p.src[p.pos - 1] == ` ` && p.src[p.pos - 2] == ` ` {
|
||||
p.pos++
|
||||
return new_node(.hard_break)
|
||||
}
|
||||
p.pos++
|
||||
return new_node(.soft_break)
|
||||
}
|
||||
|
||||
// try_linkify matches a bare URL (linkify extension).
|
||||
fn (mut p InlineParser) try_linkify() ?&Node {
|
||||
rest := p.src[p.pos..]
|
||||
for _, scheme in ['https://', 'http://', 'ftp://', 'mailto:'] {
|
||||
if rest.starts_with(scheme) {
|
||||
mut end := scheme.len
|
||||
for end < rest.len {
|
||||
ch := rest[end]
|
||||
if ch == ` ` || ch == `<` || ch == `>` || ch == `"` || ch == `\n` || ch == `\t` {
|
||||
break
|
||||
}
|
||||
end++
|
||||
}
|
||||
for end > scheme.len {
|
||||
last := rest[end - 1]
|
||||
if last == `.` || last == `,` || last == `;` || last == `!` || last == `?` {
|
||||
end--
|
||||
} else {
|
||||
break
|
||||
}
|
||||
}
|
||||
url := rest[..end]
|
||||
mut node := new_node(.autolink)
|
||||
node.literal = url
|
||||
node.dest = url
|
||||
p.pos += end
|
||||
return node
|
||||
}
|
||||
}
|
||||
return none
|
||||
}
|
||||
Reference in new issue
Block a user