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update go min version Update Vendors: * code.gitea.io/gitea-vet v0.2.0 -> v0.2.1 * code.gitea.io/sdk/gitea v0.13.0 -> v0.13.1 * github.com/AlecAivazis/survey v2.1.1 -> v2.2.2 * github.com/adrg/xdg v0.2.1 -> v0.2.2 * github.com/araddon/dateparse d820a6159ab1 -> 8aadafed4dc4 * github.com/go-git/go-git v5.1.0 -> v5.2.0 * github.com/muesli/termenv v0.7.2 -> v0.7.4 * github.com/stretchr/testify v1.5.1 -> v1.6.1 * github.com/urfave/cli v2.2.0 -> v2.3.0 Co-authored-by: 6543 <6543@obermui.de> Reviewed-on: https://gitea.com/gitea/tea/pulls/250 Reviewed-by: Andrew Thornton <art27@cantab.net> Reviewed-by: mrsdizzie <info@mrsdizzie.com> Co-Authored-By: 6543 <6543@noreply.gitea.io> Co-Committed-By: 6543 <6543@noreply.gitea.io>
1613 lines
34 KiB
Go
1613 lines
34 KiB
Go
//
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// Blackfriday Markdown Processor
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// Available at http://github.com/russross/blackfriday
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//
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// Copyright © 2011 Russ Ross <russ@russross.com>.
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// Distributed under the Simplified BSD License.
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// See README.md for details.
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//
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//
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// Functions to parse block-level elements.
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//
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package blackfriday
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import (
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"bytes"
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"html"
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"regexp"
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"strings"
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"unicode"
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)
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const (
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charEntity = "&(?:#x[a-f0-9]{1,8}|#[0-9]{1,8}|[a-z][a-z0-9]{1,31});"
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escapable = "[!\"#$%&'()*+,./:;<=>?@[\\\\\\]^_`{|}~-]"
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)
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var (
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reBackslashOrAmp = regexp.MustCompile("[\\&]")
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reEntityOrEscapedChar = regexp.MustCompile("(?i)\\\\" + escapable + "|" + charEntity)
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)
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// Parse block-level data.
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// Note: this function and many that it calls assume that
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// the input buffer ends with a newline.
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func (p *Markdown) block(data []byte) {
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// this is called recursively: enforce a maximum depth
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if p.nesting >= p.maxNesting {
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return
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}
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p.nesting++
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// parse out one block-level construct at a time
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for len(data) > 0 {
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// prefixed heading:
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//
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// # Heading 1
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// ## Heading 2
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// ...
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// ###### Heading 6
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if p.isPrefixHeading(data) {
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data = data[p.prefixHeading(data):]
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continue
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}
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// block of preformatted HTML:
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//
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// <div>
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// ...
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// </div>
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if data[0] == '<' {
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if i := p.html(data, true); i > 0 {
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data = data[i:]
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continue
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}
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}
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// title block
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//
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// % stuff
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// % more stuff
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// % even more stuff
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if p.extensions&Titleblock != 0 {
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if data[0] == '%' {
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if i := p.titleBlock(data, true); i > 0 {
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data = data[i:]
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continue
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}
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}
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}
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// blank lines. note: returns the # of bytes to skip
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if i := p.isEmpty(data); i > 0 {
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data = data[i:]
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continue
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}
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// indented code block:
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//
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// func max(a, b int) int {
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// if a > b {
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// return a
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// }
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// return b
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// }
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if p.codePrefix(data) > 0 {
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data = data[p.code(data):]
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continue
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}
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// fenced code block:
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//
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// ``` go
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// func fact(n int) int {
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// if n <= 1 {
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// return n
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// }
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// return n * fact(n-1)
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// }
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// ```
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if p.extensions&FencedCode != 0 {
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if i := p.fencedCodeBlock(data, true); i > 0 {
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data = data[i:]
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continue
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}
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}
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// horizontal rule:
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//
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// ------
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// or
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// ******
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// or
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// ______
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if p.isHRule(data) {
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p.addBlock(HorizontalRule, nil)
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var i int
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for i = 0; i < len(data) && data[i] != '\n'; i++ {
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}
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data = data[i:]
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continue
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}
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// block quote:
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//
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// > A big quote I found somewhere
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// > on the web
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if p.quotePrefix(data) > 0 {
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data = data[p.quote(data):]
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continue
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}
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// table:
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//
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// Name | Age | Phone
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// ------|-----|---------
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// Bob | 31 | 555-1234
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// Alice | 27 | 555-4321
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if p.extensions&Tables != 0 {
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if i := p.table(data); i > 0 {
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data = data[i:]
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continue
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}
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}
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// an itemized/unordered list:
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//
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// * Item 1
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// * Item 2
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//
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// also works with + or -
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if p.uliPrefix(data) > 0 {
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data = data[p.list(data, 0):]
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continue
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}
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// a numbered/ordered list:
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//
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// 1. Item 1
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// 2. Item 2
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if p.oliPrefix(data) > 0 {
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data = data[p.list(data, ListTypeOrdered):]
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continue
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}
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// definition lists:
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//
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// Term 1
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// : Definition a
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// : Definition b
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//
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// Term 2
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// : Definition c
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if p.extensions&DefinitionLists != 0 {
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if p.dliPrefix(data) > 0 {
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data = data[p.list(data, ListTypeDefinition):]
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continue
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}
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}
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// anything else must look like a normal paragraph
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// note: this finds underlined headings, too
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data = data[p.paragraph(data):]
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}
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p.nesting--
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}
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func (p *Markdown) addBlock(typ NodeType, content []byte) *Node {
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p.closeUnmatchedBlocks()
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container := p.addChild(typ, 0)
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container.content = content
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return container
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}
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func (p *Markdown) isPrefixHeading(data []byte) bool {
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if data[0] != '#' {
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return false
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}
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if p.extensions&SpaceHeadings != 0 {
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level := 0
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for level < 6 && level < len(data) && data[level] == '#' {
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level++
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}
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if level == len(data) || data[level] != ' ' {
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return false
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}
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}
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return true
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}
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func (p *Markdown) prefixHeading(data []byte) int {
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level := 0
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for level < 6 && level < len(data) && data[level] == '#' {
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level++
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}
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i := skipChar(data, level, ' ')
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end := skipUntilChar(data, i, '\n')
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skip := end
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id := ""
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if p.extensions&HeadingIDs != 0 {
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j, k := 0, 0
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// find start/end of heading id
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for j = i; j < end-1 && (data[j] != '{' || data[j+1] != '#'); j++ {
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}
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for k = j + 1; k < end && data[k] != '}'; k++ {
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}
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// extract heading id iff found
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if j < end && k < end {
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id = string(data[j+2 : k])
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end = j
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skip = k + 1
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for end > 0 && data[end-1] == ' ' {
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end--
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}
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}
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}
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for end > 0 && data[end-1] == '#' {
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if isBackslashEscaped(data, end-1) {
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break
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}
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end--
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}
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for end > 0 && data[end-1] == ' ' {
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end--
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}
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if end > i {
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if id == "" && p.extensions&AutoHeadingIDs != 0 {
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id = SanitizedAnchorName(string(data[i:end]))
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}
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block := p.addBlock(Heading, data[i:end])
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block.HeadingID = id
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block.Level = level
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}
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return skip
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}
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func (p *Markdown) isUnderlinedHeading(data []byte) int {
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// test of level 1 heading
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if data[0] == '=' {
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i := skipChar(data, 1, '=')
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i = skipChar(data, i, ' ')
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if i < len(data) && data[i] == '\n' {
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return 1
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}
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return 0
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}
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// test of level 2 heading
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if data[0] == '-' {
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i := skipChar(data, 1, '-')
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i = skipChar(data, i, ' ')
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if i < len(data) && data[i] == '\n' {
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return 2
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}
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return 0
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}
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return 0
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}
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func (p *Markdown) titleBlock(data []byte, doRender bool) int {
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if data[0] != '%' {
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return 0
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}
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splitData := bytes.Split(data, []byte("\n"))
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var i int
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for idx, b := range splitData {
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if !bytes.HasPrefix(b, []byte("%")) {
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i = idx // - 1
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break
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}
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}
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data = bytes.Join(splitData[0:i], []byte("\n"))
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consumed := len(data)
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data = bytes.TrimPrefix(data, []byte("% "))
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data = bytes.Replace(data, []byte("\n% "), []byte("\n"), -1)
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block := p.addBlock(Heading, data)
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block.Level = 1
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block.IsTitleblock = true
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return consumed
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}
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func (p *Markdown) html(data []byte, doRender bool) int {
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var i, j int
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// identify the opening tag
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if data[0] != '<' {
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return 0
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}
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curtag, tagfound := p.htmlFindTag(data[1:])
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// handle special cases
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if !tagfound {
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// check for an HTML comment
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if size := p.htmlComment(data, doRender); size > 0 {
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return size
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}
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// check for an <hr> tag
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if size := p.htmlHr(data, doRender); size > 0 {
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return size
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}
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// no special case recognized
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return 0
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}
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// look for an unindented matching closing tag
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// followed by a blank line
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found := false
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/*
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closetag := []byte("\n</" + curtag + ">")
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j = len(curtag) + 1
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for !found {
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// scan for a closing tag at the beginning of a line
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if skip := bytes.Index(data[j:], closetag); skip >= 0 {
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j += skip + len(closetag)
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} else {
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break
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}
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// see if it is the only thing on the line
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if skip := p.isEmpty(data[j:]); skip > 0 {
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// see if it is followed by a blank line/eof
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j += skip
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if j >= len(data) {
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found = true
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i = j
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} else {
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if skip := p.isEmpty(data[j:]); skip > 0 {
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j += skip
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found = true
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i = j
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}
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}
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}
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}
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*/
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// if not found, try a second pass looking for indented match
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// but not if tag is "ins" or "del" (following original Markdown.pl)
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if !found && curtag != "ins" && curtag != "del" {
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i = 1
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for i < len(data) {
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i++
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for i < len(data) && !(data[i-1] == '<' && data[i] == '/') {
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i++
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}
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if i+2+len(curtag) >= len(data) {
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break
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}
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j = p.htmlFindEnd(curtag, data[i-1:])
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if j > 0 {
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i += j - 1
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found = true
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break
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}
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}
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}
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if !found {
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return 0
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}
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// the end of the block has been found
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if doRender {
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// trim newlines
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end := i
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for end > 0 && data[end-1] == '\n' {
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end--
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}
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finalizeHTMLBlock(p.addBlock(HTMLBlock, data[:end]))
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}
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return i
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}
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func finalizeHTMLBlock(block *Node) {
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block.Literal = block.content
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block.content = nil
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}
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// HTML comment, lax form
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func (p *Markdown) htmlComment(data []byte, doRender bool) int {
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i := p.inlineHTMLComment(data)
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// needs to end with a blank line
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if j := p.isEmpty(data[i:]); j > 0 {
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size := i + j
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if doRender {
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// trim trailing newlines
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end := size
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for end > 0 && data[end-1] == '\n' {
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end--
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}
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block := p.addBlock(HTMLBlock, data[:end])
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finalizeHTMLBlock(block)
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}
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return size
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}
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return 0
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}
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// HR, which is the only self-closing block tag considered
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func (p *Markdown) htmlHr(data []byte, doRender bool) int {
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if len(data) < 4 {
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return 0
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}
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if data[0] != '<' || (data[1] != 'h' && data[1] != 'H') || (data[2] != 'r' && data[2] != 'R') {
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return 0
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}
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if data[3] != ' ' && data[3] != '/' && data[3] != '>' {
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// not an <hr> tag after all; at least not a valid one
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return 0
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}
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i := 3
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for i < len(data) && data[i] != '>' && data[i] != '\n' {
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i++
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}
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if i < len(data) && data[i] == '>' {
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i++
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if j := p.isEmpty(data[i:]); j > 0 {
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size := i + j
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if doRender {
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// trim newlines
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end := size
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for end > 0 && data[end-1] == '\n' {
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end--
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}
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finalizeHTMLBlock(p.addBlock(HTMLBlock, data[:end]))
|
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}
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return size
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}
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}
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return 0
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}
|
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|
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func (p *Markdown) htmlFindTag(data []byte) (string, bool) {
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i := 0
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for i < len(data) && isalnum(data[i]) {
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i++
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}
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key := string(data[:i])
|
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if _, ok := blockTags[key]; ok {
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return key, true
|
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}
|
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return "", false
|
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}
|
|
|
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func (p *Markdown) htmlFindEnd(tag string, data []byte) int {
|
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// assume data[0] == '<' && data[1] == '/' already tested
|
|
if tag == "hr" {
|
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return 2
|
|
}
|
|
// check if tag is a match
|
|
closetag := []byte("</" + tag + ">")
|
|
if !bytes.HasPrefix(data, closetag) {
|
|
return 0
|
|
}
|
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i := len(closetag)
|
|
|
|
// check that the rest of the line is blank
|
|
skip := 0
|
|
if skip = p.isEmpty(data[i:]); skip == 0 {
|
|
return 0
|
|
}
|
|
i += skip
|
|
skip = 0
|
|
|
|
if i >= len(data) {
|
|
return i
|
|
}
|
|
|
|
if p.extensions&LaxHTMLBlocks != 0 {
|
|
return i
|
|
}
|
|
if skip = p.isEmpty(data[i:]); skip == 0 {
|
|
// following line must be blank
|
|
return 0
|
|
}
|
|
|
|
return i + skip
|
|
}
|
|
|
|
func (*Markdown) isEmpty(data []byte) int {
|
|
// it is okay to call isEmpty on an empty buffer
|
|
if len(data) == 0 {
|
|
return 0
|
|
}
|
|
|
|
var i int
|
|
for i = 0; i < len(data) && data[i] != '\n'; i++ {
|
|
if data[i] != ' ' && data[i] != '\t' {
|
|
return 0
|
|
}
|
|
}
|
|
if i < len(data) && data[i] == '\n' {
|
|
i++
|
|
}
|
|
return i
|
|
}
|
|
|
|
func (*Markdown) isHRule(data []byte) bool {
|
|
i := 0
|
|
|
|
// skip up to three spaces
|
|
for i < 3 && data[i] == ' ' {
|
|
i++
|
|
}
|
|
|
|
// look at the hrule char
|
|
if data[i] != '*' && data[i] != '-' && data[i] != '_' {
|
|
return false
|
|
}
|
|
c := data[i]
|
|
|
|
// the whole line must be the char or whitespace
|
|
n := 0
|
|
for i < len(data) && data[i] != '\n' {
|
|
switch {
|
|
case data[i] == c:
|
|
n++
|
|
case data[i] != ' ':
|
|
return false
|
|
}
|
|
i++
|
|
}
|
|
|
|
return n >= 3
|
|
}
|
|
|
|
// isFenceLine checks if there's a fence line (e.g., ``` or ``` go) at the beginning of data,
|
|
// and returns the end index if so, or 0 otherwise. It also returns the marker found.
|
|
// If info is not nil, it gets set to the syntax specified in the fence line.
|
|
func isFenceLine(data []byte, info *string, oldmarker string) (end int, marker string) {
|
|
i, size := 0, 0
|
|
|
|
// skip up to three spaces
|
|
for i < len(data) && i < 3 && data[i] == ' ' {
|
|
i++
|
|
}
|
|
|
|
// check for the marker characters: ~ or `
|
|
if i >= len(data) {
|
|
return 0, ""
|
|
}
|
|
if data[i] != '~' && data[i] != '`' {
|
|
return 0, ""
|
|
}
|
|
|
|
c := data[i]
|
|
|
|
// the whole line must be the same char or whitespace
|
|
for i < len(data) && data[i] == c {
|
|
size++
|
|
i++
|
|
}
|
|
|
|
// the marker char must occur at least 3 times
|
|
if size < 3 {
|
|
return 0, ""
|
|
}
|
|
marker = string(data[i-size : i])
|
|
|
|
// if this is the end marker, it must match the beginning marker
|
|
if oldmarker != "" && marker != oldmarker {
|
|
return 0, ""
|
|
}
|
|
|
|
// TODO(shurcooL): It's probably a good idea to simplify the 2 code paths here
|
|
// into one, always get the info string, and discard it if the caller doesn't care.
|
|
if info != nil {
|
|
infoLength := 0
|
|
i = skipChar(data, i, ' ')
|
|
|
|
if i >= len(data) {
|
|
if i == len(data) {
|
|
return i, marker
|
|
}
|
|
return 0, ""
|
|
}
|
|
|
|
infoStart := i
|
|
|
|
if data[i] == '{' {
|
|
i++
|
|
infoStart++
|
|
|
|
for i < len(data) && data[i] != '}' && data[i] != '\n' {
|
|
infoLength++
|
|
i++
|
|
}
|
|
|
|
if i >= len(data) || data[i] != '}' {
|
|
return 0, ""
|
|
}
|
|
|
|
// strip all whitespace at the beginning and the end
|
|
// of the {} block
|
|
for infoLength > 0 && isspace(data[infoStart]) {
|
|
infoStart++
|
|
infoLength--
|
|
}
|
|
|
|
for infoLength > 0 && isspace(data[infoStart+infoLength-1]) {
|
|
infoLength--
|
|
}
|
|
i++
|
|
i = skipChar(data, i, ' ')
|
|
} else {
|
|
for i < len(data) && !isverticalspace(data[i]) {
|
|
infoLength++
|
|
i++
|
|
}
|
|
}
|
|
|
|
*info = strings.TrimSpace(string(data[infoStart : infoStart+infoLength]))
|
|
}
|
|
|
|
if i == len(data) {
|
|
return i, marker
|
|
}
|
|
if i > len(data) || data[i] != '\n' {
|
|
return 0, ""
|
|
}
|
|
return i + 1, marker // Take newline into account.
|
|
}
|
|
|
|
// fencedCodeBlock returns the end index if data contains a fenced code block at the beginning,
|
|
// or 0 otherwise. It writes to out if doRender is true, otherwise it has no side effects.
|
|
// If doRender is true, a final newline is mandatory to recognize the fenced code block.
|
|
func (p *Markdown) fencedCodeBlock(data []byte, doRender bool) int {
|
|
var info string
|
|
beg, marker := isFenceLine(data, &info, "")
|
|
if beg == 0 || beg >= len(data) {
|
|
return 0
|
|
}
|
|
fenceLength := beg - 1
|
|
|
|
var work bytes.Buffer
|
|
work.Write([]byte(info))
|
|
work.WriteByte('\n')
|
|
|
|
for {
|
|
// safe to assume beg < len(data)
|
|
|
|
// check for the end of the code block
|
|
fenceEnd, _ := isFenceLine(data[beg:], nil, marker)
|
|
if fenceEnd != 0 {
|
|
beg += fenceEnd
|
|
break
|
|
}
|
|
|
|
// copy the current line
|
|
end := skipUntilChar(data, beg, '\n') + 1
|
|
|
|
// did we reach the end of the buffer without a closing marker?
|
|
if end >= len(data) {
|
|
return 0
|
|
}
|
|
|
|
// verbatim copy to the working buffer
|
|
if doRender {
|
|
work.Write(data[beg:end])
|
|
}
|
|
beg = end
|
|
}
|
|
|
|
if doRender {
|
|
block := p.addBlock(CodeBlock, work.Bytes()) // TODO: get rid of temp buffer
|
|
block.IsFenced = true
|
|
block.FenceLength = fenceLength
|
|
finalizeCodeBlock(block)
|
|
}
|
|
|
|
return beg
|
|
}
|
|
|
|
func unescapeChar(str []byte) []byte {
|
|
if str[0] == '\\' {
|
|
return []byte{str[1]}
|
|
}
|
|
return []byte(html.UnescapeString(string(str)))
|
|
}
|
|
|
|
func unescapeString(str []byte) []byte {
|
|
if reBackslashOrAmp.Match(str) {
|
|
return reEntityOrEscapedChar.ReplaceAllFunc(str, unescapeChar)
|
|
}
|
|
return str
|
|
}
|
|
|
|
func finalizeCodeBlock(block *Node) {
|
|
if block.IsFenced {
|
|
newlinePos := bytes.IndexByte(block.content, '\n')
|
|
firstLine := block.content[:newlinePos]
|
|
rest := block.content[newlinePos+1:]
|
|
block.Info = unescapeString(bytes.Trim(firstLine, "\n"))
|
|
block.Literal = rest
|
|
} else {
|
|
block.Literal = block.content
|
|
}
|
|
block.content = nil
|
|
}
|
|
|
|
func (p *Markdown) table(data []byte) int {
|
|
table := p.addBlock(Table, nil)
|
|
i, columns := p.tableHeader(data)
|
|
if i == 0 {
|
|
p.tip = table.Parent
|
|
table.Unlink()
|
|
return 0
|
|
}
|
|
|
|
p.addBlock(TableBody, nil)
|
|
|
|
for i < len(data) {
|
|
pipes, rowStart := 0, i
|
|
for ; i < len(data) && data[i] != '\n'; i++ {
|
|
if data[i] == '|' {
|
|
pipes++
|
|
}
|
|
}
|
|
|
|
if pipes == 0 {
|
|
i = rowStart
|
|
break
|
|
}
|
|
|
|
// include the newline in data sent to tableRow
|
|
if i < len(data) && data[i] == '\n' {
|
|
i++
|
|
}
|
|
p.tableRow(data[rowStart:i], columns, false)
|
|
}
|
|
|
|
return i
|
|
}
|
|
|
|
// check if the specified position is preceded by an odd number of backslashes
|
|
func isBackslashEscaped(data []byte, i int) bool {
|
|
backslashes := 0
|
|
for i-backslashes-1 >= 0 && data[i-backslashes-1] == '\\' {
|
|
backslashes++
|
|
}
|
|
return backslashes&1 == 1
|
|
}
|
|
|
|
func (p *Markdown) tableHeader(data []byte) (size int, columns []CellAlignFlags) {
|
|
i := 0
|
|
colCount := 1
|
|
for i = 0; i < len(data) && data[i] != '\n'; i++ {
|
|
if data[i] == '|' && !isBackslashEscaped(data, i) {
|
|
colCount++
|
|
}
|
|
}
|
|
|
|
// doesn't look like a table header
|
|
if colCount == 1 {
|
|
return
|
|
}
|
|
|
|
// include the newline in the data sent to tableRow
|
|
j := i
|
|
if j < len(data) && data[j] == '\n' {
|
|
j++
|
|
}
|
|
header := data[:j]
|
|
|
|
// column count ignores pipes at beginning or end of line
|
|
if data[0] == '|' {
|
|
colCount--
|
|
}
|
|
if i > 2 && data[i-1] == '|' && !isBackslashEscaped(data, i-1) {
|
|
colCount--
|
|
}
|
|
|
|
columns = make([]CellAlignFlags, colCount)
|
|
|
|
// move on to the header underline
|
|
i++
|
|
if i >= len(data) {
|
|
return
|
|
}
|
|
|
|
if data[i] == '|' && !isBackslashEscaped(data, i) {
|
|
i++
|
|
}
|
|
i = skipChar(data, i, ' ')
|
|
|
|
// each column header is of form: / *:?-+:? *|/ with # dashes + # colons >= 3
|
|
// and trailing | optional on last column
|
|
col := 0
|
|
for i < len(data) && data[i] != '\n' {
|
|
dashes := 0
|
|
|
|
if data[i] == ':' {
|
|
i++
|
|
columns[col] |= TableAlignmentLeft
|
|
dashes++
|
|
}
|
|
for i < len(data) && data[i] == '-' {
|
|
i++
|
|
dashes++
|
|
}
|
|
if i < len(data) && data[i] == ':' {
|
|
i++
|
|
columns[col] |= TableAlignmentRight
|
|
dashes++
|
|
}
|
|
for i < len(data) && data[i] == ' ' {
|
|
i++
|
|
}
|
|
if i == len(data) {
|
|
return
|
|
}
|
|
// end of column test is messy
|
|
switch {
|
|
case dashes < 3:
|
|
// not a valid column
|
|
return
|
|
|
|
case data[i] == '|' && !isBackslashEscaped(data, i):
|
|
// marker found, now skip past trailing whitespace
|
|
col++
|
|
i++
|
|
for i < len(data) && data[i] == ' ' {
|
|
i++
|
|
}
|
|
|
|
// trailing junk found after last column
|
|
if col >= colCount && i < len(data) && data[i] != '\n' {
|
|
return
|
|
}
|
|
|
|
case (data[i] != '|' || isBackslashEscaped(data, i)) && col+1 < colCount:
|
|
// something else found where marker was required
|
|
return
|
|
|
|
case data[i] == '\n':
|
|
// marker is optional for the last column
|
|
col++
|
|
|
|
default:
|
|
// trailing junk found after last column
|
|
return
|
|
}
|
|
}
|
|
if col != colCount {
|
|
return
|
|
}
|
|
|
|
p.addBlock(TableHead, nil)
|
|
p.tableRow(header, columns, true)
|
|
size = i
|
|
if size < len(data) && data[size] == '\n' {
|
|
size++
|
|
}
|
|
return
|
|
}
|
|
|
|
func (p *Markdown) tableRow(data []byte, columns []CellAlignFlags, header bool) {
|
|
p.addBlock(TableRow, nil)
|
|
i, col := 0, 0
|
|
|
|
if data[i] == '|' && !isBackslashEscaped(data, i) {
|
|
i++
|
|
}
|
|
|
|
for col = 0; col < len(columns) && i < len(data); col++ {
|
|
for i < len(data) && data[i] == ' ' {
|
|
i++
|
|
}
|
|
|
|
cellStart := i
|
|
|
|
for i < len(data) && (data[i] != '|' || isBackslashEscaped(data, i)) && data[i] != '\n' {
|
|
i++
|
|
}
|
|
|
|
cellEnd := i
|
|
|
|
// skip the end-of-cell marker, possibly taking us past end of buffer
|
|
i++
|
|
|
|
for cellEnd > cellStart && cellEnd-1 < len(data) && data[cellEnd-1] == ' ' {
|
|
cellEnd--
|
|
}
|
|
|
|
cell := p.addBlock(TableCell, data[cellStart:cellEnd])
|
|
cell.IsHeader = header
|
|
cell.Align = columns[col]
|
|
}
|
|
|
|
// pad it out with empty columns to get the right number
|
|
for ; col < len(columns); col++ {
|
|
cell := p.addBlock(TableCell, nil)
|
|
cell.IsHeader = header
|
|
cell.Align = columns[col]
|
|
}
|
|
|
|
// silently ignore rows with too many cells
|
|
}
|
|
|
|
// returns blockquote prefix length
|
|
func (p *Markdown) quotePrefix(data []byte) int {
|
|
i := 0
|
|
for i < 3 && i < len(data) && data[i] == ' ' {
|
|
i++
|
|
}
|
|
if i < len(data) && data[i] == '>' {
|
|
if i+1 < len(data) && data[i+1] == ' ' {
|
|
return i + 2
|
|
}
|
|
return i + 1
|
|
}
|
|
return 0
|
|
}
|
|
|
|
// blockquote ends with at least one blank line
|
|
// followed by something without a blockquote prefix
|
|
func (p *Markdown) terminateBlockquote(data []byte, beg, end int) bool {
|
|
if p.isEmpty(data[beg:]) <= 0 {
|
|
return false
|
|
}
|
|
if end >= len(data) {
|
|
return true
|
|
}
|
|
return p.quotePrefix(data[end:]) == 0 && p.isEmpty(data[end:]) == 0
|
|
}
|
|
|
|
// parse a blockquote fragment
|
|
func (p *Markdown) quote(data []byte) int {
|
|
block := p.addBlock(BlockQuote, nil)
|
|
var raw bytes.Buffer
|
|
beg, end := 0, 0
|
|
for beg < len(data) {
|
|
end = beg
|
|
// Step over whole lines, collecting them. While doing that, check for
|
|
// fenced code and if one's found, incorporate it altogether,
|
|
// irregardless of any contents inside it
|
|
for end < len(data) && data[end] != '\n' {
|
|
if p.extensions&FencedCode != 0 {
|
|
if i := p.fencedCodeBlock(data[end:], false); i > 0 {
|
|
// -1 to compensate for the extra end++ after the loop:
|
|
end += i - 1
|
|
break
|
|
}
|
|
}
|
|
end++
|
|
}
|
|
if end < len(data) && data[end] == '\n' {
|
|
end++
|
|
}
|
|
if pre := p.quotePrefix(data[beg:]); pre > 0 {
|
|
// skip the prefix
|
|
beg += pre
|
|
} else if p.terminateBlockquote(data, beg, end) {
|
|
break
|
|
}
|
|
// this line is part of the blockquote
|
|
raw.Write(data[beg:end])
|
|
beg = end
|
|
}
|
|
p.block(raw.Bytes())
|
|
p.finalize(block)
|
|
return end
|
|
}
|
|
|
|
// returns prefix length for block code
|
|
func (p *Markdown) codePrefix(data []byte) int {
|
|
if len(data) >= 1 && data[0] == '\t' {
|
|
return 1
|
|
}
|
|
if len(data) >= 4 && data[0] == ' ' && data[1] == ' ' && data[2] == ' ' && data[3] == ' ' {
|
|
return 4
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func (p *Markdown) code(data []byte) int {
|
|
var work bytes.Buffer
|
|
|
|
i := 0
|
|
for i < len(data) {
|
|
beg := i
|
|
for i < len(data) && data[i] != '\n' {
|
|
i++
|
|
}
|
|
if i < len(data) && data[i] == '\n' {
|
|
i++
|
|
}
|
|
|
|
blankline := p.isEmpty(data[beg:i]) > 0
|
|
if pre := p.codePrefix(data[beg:i]); pre > 0 {
|
|
beg += pre
|
|
} else if !blankline {
|
|
// non-empty, non-prefixed line breaks the pre
|
|
i = beg
|
|
break
|
|
}
|
|
|
|
// verbatim copy to the working buffer
|
|
if blankline {
|
|
work.WriteByte('\n')
|
|
} else {
|
|
work.Write(data[beg:i])
|
|
}
|
|
}
|
|
|
|
// trim all the \n off the end of work
|
|
workbytes := work.Bytes()
|
|
eol := len(workbytes)
|
|
for eol > 0 && workbytes[eol-1] == '\n' {
|
|
eol--
|
|
}
|
|
if eol != len(workbytes) {
|
|
work.Truncate(eol)
|
|
}
|
|
|
|
work.WriteByte('\n')
|
|
|
|
block := p.addBlock(CodeBlock, work.Bytes()) // TODO: get rid of temp buffer
|
|
block.IsFenced = false
|
|
finalizeCodeBlock(block)
|
|
|
|
return i
|
|
}
|
|
|
|
// returns unordered list item prefix
|
|
func (p *Markdown) uliPrefix(data []byte) int {
|
|
i := 0
|
|
// start with up to 3 spaces
|
|
for i < len(data) && i < 3 && data[i] == ' ' {
|
|
i++
|
|
}
|
|
if i >= len(data)-1 {
|
|
return 0
|
|
}
|
|
// need one of {'*', '+', '-'} followed by a space or a tab
|
|
if (data[i] != '*' && data[i] != '+' && data[i] != '-') ||
|
|
(data[i+1] != ' ' && data[i+1] != '\t') {
|
|
return 0
|
|
}
|
|
return i + 2
|
|
}
|
|
|
|
// returns ordered list item prefix
|
|
func (p *Markdown) oliPrefix(data []byte) int {
|
|
i := 0
|
|
|
|
// start with up to 3 spaces
|
|
for i < 3 && i < len(data) && data[i] == ' ' {
|
|
i++
|
|
}
|
|
|
|
// count the digits
|
|
start := i
|
|
for i < len(data) && data[i] >= '0' && data[i] <= '9' {
|
|
i++
|
|
}
|
|
if start == i || i >= len(data)-1 {
|
|
return 0
|
|
}
|
|
|
|
// we need >= 1 digits followed by a dot and a space or a tab
|
|
if data[i] != '.' || !(data[i+1] == ' ' || data[i+1] == '\t') {
|
|
return 0
|
|
}
|
|
return i + 2
|
|
}
|
|
|
|
// returns definition list item prefix
|
|
func (p *Markdown) dliPrefix(data []byte) int {
|
|
if len(data) < 2 {
|
|
return 0
|
|
}
|
|
i := 0
|
|
// need a ':' followed by a space or a tab
|
|
if data[i] != ':' || !(data[i+1] == ' ' || data[i+1] == '\t') {
|
|
return 0
|
|
}
|
|
for i < len(data) && data[i] == ' ' {
|
|
i++
|
|
}
|
|
return i + 2
|
|
}
|
|
|
|
// parse ordered or unordered list block
|
|
func (p *Markdown) list(data []byte, flags ListType) int {
|
|
i := 0
|
|
flags |= ListItemBeginningOfList
|
|
block := p.addBlock(List, nil)
|
|
block.ListFlags = flags
|
|
block.Tight = true
|
|
|
|
for i < len(data) {
|
|
skip := p.listItem(data[i:], &flags)
|
|
if flags&ListItemContainsBlock != 0 {
|
|
block.ListData.Tight = false
|
|
}
|
|
i += skip
|
|
if skip == 0 || flags&ListItemEndOfList != 0 {
|
|
break
|
|
}
|
|
flags &= ^ListItemBeginningOfList
|
|
}
|
|
|
|
above := block.Parent
|
|
finalizeList(block)
|
|
p.tip = above
|
|
return i
|
|
}
|
|
|
|
// Returns true if the list item is not the same type as its parent list
|
|
func (p *Markdown) listTypeChanged(data []byte, flags *ListType) bool {
|
|
if p.dliPrefix(data) > 0 && *flags&ListTypeDefinition == 0 {
|
|
return true
|
|
} else if p.oliPrefix(data) > 0 && *flags&ListTypeOrdered == 0 {
|
|
return true
|
|
} else if p.uliPrefix(data) > 0 && (*flags&ListTypeOrdered != 0 || *flags&ListTypeDefinition != 0) {
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// Returns true if block ends with a blank line, descending if needed
|
|
// into lists and sublists.
|
|
func endsWithBlankLine(block *Node) bool {
|
|
// TODO: figure this out. Always false now.
|
|
for block != nil {
|
|
//if block.lastLineBlank {
|
|
//return true
|
|
//}
|
|
t := block.Type
|
|
if t == List || t == Item {
|
|
block = block.LastChild
|
|
} else {
|
|
break
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
func finalizeList(block *Node) {
|
|
block.open = false
|
|
item := block.FirstChild
|
|
for item != nil {
|
|
// check for non-final list item ending with blank line:
|
|
if endsWithBlankLine(item) && item.Next != nil {
|
|
block.ListData.Tight = false
|
|
break
|
|
}
|
|
// recurse into children of list item, to see if there are spaces
|
|
// between any of them:
|
|
subItem := item.FirstChild
|
|
for subItem != nil {
|
|
if endsWithBlankLine(subItem) && (item.Next != nil || subItem.Next != nil) {
|
|
block.ListData.Tight = false
|
|
break
|
|
}
|
|
subItem = subItem.Next
|
|
}
|
|
item = item.Next
|
|
}
|
|
}
|
|
|
|
// Parse a single list item.
|
|
// Assumes initial prefix is already removed if this is a sublist.
|
|
func (p *Markdown) listItem(data []byte, flags *ListType) int {
|
|
// keep track of the indentation of the first line
|
|
itemIndent := 0
|
|
if data[0] == '\t' {
|
|
itemIndent += 4
|
|
} else {
|
|
for itemIndent < 3 && data[itemIndent] == ' ' {
|
|
itemIndent++
|
|
}
|
|
}
|
|
|
|
var bulletChar byte = '*'
|
|
i := p.uliPrefix(data)
|
|
if i == 0 {
|
|
i = p.oliPrefix(data)
|
|
} else {
|
|
bulletChar = data[i-2]
|
|
}
|
|
if i == 0 {
|
|
i = p.dliPrefix(data)
|
|
// reset definition term flag
|
|
if i > 0 {
|
|
*flags &= ^ListTypeTerm
|
|
}
|
|
}
|
|
if i == 0 {
|
|
// if in definition list, set term flag and continue
|
|
if *flags&ListTypeDefinition != 0 {
|
|
*flags |= ListTypeTerm
|
|
} else {
|
|
return 0
|
|
}
|
|
}
|
|
|
|
// skip leading whitespace on first line
|
|
for i < len(data) && data[i] == ' ' {
|
|
i++
|
|
}
|
|
|
|
// find the end of the line
|
|
line := i
|
|
for i > 0 && i < len(data) && data[i-1] != '\n' {
|
|
i++
|
|
}
|
|
|
|
// get working buffer
|
|
var raw bytes.Buffer
|
|
|
|
// put the first line into the working buffer
|
|
raw.Write(data[line:i])
|
|
line = i
|
|
|
|
// process the following lines
|
|
containsBlankLine := false
|
|
sublist := 0
|
|
codeBlockMarker := ""
|
|
|
|
gatherlines:
|
|
for line < len(data) {
|
|
i++
|
|
|
|
// find the end of this line
|
|
for i < len(data) && data[i-1] != '\n' {
|
|
i++
|
|
}
|
|
|
|
// if it is an empty line, guess that it is part of this item
|
|
// and move on to the next line
|
|
if p.isEmpty(data[line:i]) > 0 {
|
|
containsBlankLine = true
|
|
line = i
|
|
continue
|
|
}
|
|
|
|
// calculate the indentation
|
|
indent := 0
|
|
indentIndex := 0
|
|
if data[line] == '\t' {
|
|
indentIndex++
|
|
indent += 4
|
|
} else {
|
|
for indent < 4 && line+indent < i && data[line+indent] == ' ' {
|
|
indent++
|
|
indentIndex++
|
|
}
|
|
}
|
|
|
|
chunk := data[line+indentIndex : i]
|
|
|
|
if p.extensions&FencedCode != 0 {
|
|
// determine if in or out of codeblock
|
|
// if in codeblock, ignore normal list processing
|
|
_, marker := isFenceLine(chunk, nil, codeBlockMarker)
|
|
if marker != "" {
|
|
if codeBlockMarker == "" {
|
|
// start of codeblock
|
|
codeBlockMarker = marker
|
|
} else {
|
|
// end of codeblock.
|
|
codeBlockMarker = ""
|
|
}
|
|
}
|
|
// we are in a codeblock, write line, and continue
|
|
if codeBlockMarker != "" || marker != "" {
|
|
raw.Write(data[line+indentIndex : i])
|
|
line = i
|
|
continue gatherlines
|
|
}
|
|
}
|
|
|
|
// evaluate how this line fits in
|
|
switch {
|
|
// is this a nested list item?
|
|
case (p.uliPrefix(chunk) > 0 && !p.isHRule(chunk)) ||
|
|
p.oliPrefix(chunk) > 0 ||
|
|
p.dliPrefix(chunk) > 0:
|
|
|
|
// to be a nested list, it must be indented more
|
|
// if not, it is either a different kind of list
|
|
// or the next item in the same list
|
|
if indent <= itemIndent {
|
|
if p.listTypeChanged(chunk, flags) {
|
|
*flags |= ListItemEndOfList
|
|
} else if containsBlankLine {
|
|
*flags |= ListItemContainsBlock
|
|
}
|
|
|
|
break gatherlines
|
|
}
|
|
|
|
if containsBlankLine {
|
|
*flags |= ListItemContainsBlock
|
|
}
|
|
|
|
// is this the first item in the nested list?
|
|
if sublist == 0 {
|
|
sublist = raw.Len()
|
|
}
|
|
|
|
// is this a nested prefix heading?
|
|
case p.isPrefixHeading(chunk):
|
|
// if the heading is not indented, it is not nested in the list
|
|
// and thus ends the list
|
|
if containsBlankLine && indent < 4 {
|
|
*flags |= ListItemEndOfList
|
|
break gatherlines
|
|
}
|
|
*flags |= ListItemContainsBlock
|
|
|
|
// anything following an empty line is only part
|
|
// of this item if it is indented 4 spaces
|
|
// (regardless of the indentation of the beginning of the item)
|
|
case containsBlankLine && indent < 4:
|
|
if *flags&ListTypeDefinition != 0 && i < len(data)-1 {
|
|
// is the next item still a part of this list?
|
|
next := i
|
|
for next < len(data) && data[next] != '\n' {
|
|
next++
|
|
}
|
|
for next < len(data)-1 && data[next] == '\n' {
|
|
next++
|
|
}
|
|
if i < len(data)-1 && data[i] != ':' && data[next] != ':' {
|
|
*flags |= ListItemEndOfList
|
|
}
|
|
} else {
|
|
*flags |= ListItemEndOfList
|
|
}
|
|
break gatherlines
|
|
|
|
// a blank line means this should be parsed as a block
|
|
case containsBlankLine:
|
|
raw.WriteByte('\n')
|
|
*flags |= ListItemContainsBlock
|
|
}
|
|
|
|
// if this line was preceded by one or more blanks,
|
|
// re-introduce the blank into the buffer
|
|
if containsBlankLine {
|
|
containsBlankLine = false
|
|
raw.WriteByte('\n')
|
|
}
|
|
|
|
// add the line into the working buffer without prefix
|
|
raw.Write(data[line+indentIndex : i])
|
|
|
|
line = i
|
|
}
|
|
|
|
rawBytes := raw.Bytes()
|
|
|
|
block := p.addBlock(Item, nil)
|
|
block.ListFlags = *flags
|
|
block.Tight = false
|
|
block.BulletChar = bulletChar
|
|
block.Delimiter = '.' // Only '.' is possible in Markdown, but ')' will also be possible in CommonMark
|
|
|
|
// render the contents of the list item
|
|
if *flags&ListItemContainsBlock != 0 && *flags&ListTypeTerm == 0 {
|
|
// intermediate render of block item, except for definition term
|
|
if sublist > 0 {
|
|
p.block(rawBytes[:sublist])
|
|
p.block(rawBytes[sublist:])
|
|
} else {
|
|
p.block(rawBytes)
|
|
}
|
|
} else {
|
|
// intermediate render of inline item
|
|
if sublist > 0 {
|
|
child := p.addChild(Paragraph, 0)
|
|
child.content = rawBytes[:sublist]
|
|
p.block(rawBytes[sublist:])
|
|
} else {
|
|
child := p.addChild(Paragraph, 0)
|
|
child.content = rawBytes
|
|
}
|
|
}
|
|
return line
|
|
}
|
|
|
|
// render a single paragraph that has already been parsed out
|
|
func (p *Markdown) renderParagraph(data []byte) {
|
|
if len(data) == 0 {
|
|
return
|
|
}
|
|
|
|
// trim leading spaces
|
|
beg := 0
|
|
for data[beg] == ' ' {
|
|
beg++
|
|
}
|
|
|
|
end := len(data)
|
|
// trim trailing newline
|
|
if data[len(data)-1] == '\n' {
|
|
end--
|
|
}
|
|
|
|
// trim trailing spaces
|
|
for end > beg && data[end-1] == ' ' {
|
|
end--
|
|
}
|
|
|
|
p.addBlock(Paragraph, data[beg:end])
|
|
}
|
|
|
|
func (p *Markdown) paragraph(data []byte) int {
|
|
// prev: index of 1st char of previous line
|
|
// line: index of 1st char of current line
|
|
// i: index of cursor/end of current line
|
|
var prev, line, i int
|
|
tabSize := TabSizeDefault
|
|
if p.extensions&TabSizeEight != 0 {
|
|
tabSize = TabSizeDouble
|
|
}
|
|
// keep going until we find something to mark the end of the paragraph
|
|
for i < len(data) {
|
|
// mark the beginning of the current line
|
|
prev = line
|
|
current := data[i:]
|
|
line = i
|
|
|
|
// did we find a reference or a footnote? If so, end a paragraph
|
|
// preceding it and report that we have consumed up to the end of that
|
|
// reference:
|
|
if refEnd := isReference(p, current, tabSize); refEnd > 0 {
|
|
p.renderParagraph(data[:i])
|
|
return i + refEnd
|
|
}
|
|
|
|
// did we find a blank line marking the end of the paragraph?
|
|
if n := p.isEmpty(current); n > 0 {
|
|
// did this blank line followed by a definition list item?
|
|
if p.extensions&DefinitionLists != 0 {
|
|
if i < len(data)-1 && data[i+1] == ':' {
|
|
return p.list(data[prev:], ListTypeDefinition)
|
|
}
|
|
}
|
|
|
|
p.renderParagraph(data[:i])
|
|
return i + n
|
|
}
|
|
|
|
// an underline under some text marks a heading, so our paragraph ended on prev line
|
|
if i > 0 {
|
|
if level := p.isUnderlinedHeading(current); level > 0 {
|
|
// render the paragraph
|
|
p.renderParagraph(data[:prev])
|
|
|
|
// ignore leading and trailing whitespace
|
|
eol := i - 1
|
|
for prev < eol && data[prev] == ' ' {
|
|
prev++
|
|
}
|
|
for eol > prev && data[eol-1] == ' ' {
|
|
eol--
|
|
}
|
|
|
|
id := ""
|
|
if p.extensions&AutoHeadingIDs != 0 {
|
|
id = SanitizedAnchorName(string(data[prev:eol]))
|
|
}
|
|
|
|
block := p.addBlock(Heading, data[prev:eol])
|
|
block.Level = level
|
|
block.HeadingID = id
|
|
|
|
// find the end of the underline
|
|
for i < len(data) && data[i] != '\n' {
|
|
i++
|
|
}
|
|
return i
|
|
}
|
|
}
|
|
|
|
// if the next line starts a block of HTML, then the paragraph ends here
|
|
if p.extensions&LaxHTMLBlocks != 0 {
|
|
if data[i] == '<' && p.html(current, false) > 0 {
|
|
// rewind to before the HTML block
|
|
p.renderParagraph(data[:i])
|
|
return i
|
|
}
|
|
}
|
|
|
|
// if there's a prefixed heading or a horizontal rule after this, paragraph is over
|
|
if p.isPrefixHeading(current) || p.isHRule(current) {
|
|
p.renderParagraph(data[:i])
|
|
return i
|
|
}
|
|
|
|
// if there's a fenced code block, paragraph is over
|
|
if p.extensions&FencedCode != 0 {
|
|
if p.fencedCodeBlock(current, false) > 0 {
|
|
p.renderParagraph(data[:i])
|
|
return i
|
|
}
|
|
}
|
|
|
|
// if there's a definition list item, prev line is a definition term
|
|
if p.extensions&DefinitionLists != 0 {
|
|
if p.dliPrefix(current) != 0 {
|
|
ret := p.list(data[prev:], ListTypeDefinition)
|
|
return ret
|
|
}
|
|
}
|
|
|
|
// if there's a list after this, paragraph is over
|
|
if p.extensions&NoEmptyLineBeforeBlock != 0 {
|
|
if p.uliPrefix(current) != 0 ||
|
|
p.oliPrefix(current) != 0 ||
|
|
p.quotePrefix(current) != 0 ||
|
|
p.codePrefix(current) != 0 {
|
|
p.renderParagraph(data[:i])
|
|
return i
|
|
}
|
|
}
|
|
|
|
// otherwise, scan to the beginning of the next line
|
|
nl := bytes.IndexByte(data[i:], '\n')
|
|
if nl >= 0 {
|
|
i += nl + 1
|
|
} else {
|
|
i += len(data[i:])
|
|
}
|
|
}
|
|
|
|
p.renderParagraph(data[:i])
|
|
return i
|
|
}
|
|
|
|
func skipChar(data []byte, start int, char byte) int {
|
|
i := start
|
|
for i < len(data) && data[i] == char {
|
|
i++
|
|
}
|
|
return i
|
|
}
|
|
|
|
func skipUntilChar(text []byte, start int, char byte) int {
|
|
i := start
|
|
for i < len(text) && text[i] != char {
|
|
i++
|
|
}
|
|
return i
|
|
}
|
|
|
|
// SanitizedAnchorName returns a sanitized anchor name for the given text.
|
|
//
|
|
// It implements the algorithm specified in the package comment.
|
|
func SanitizedAnchorName(text string) string {
|
|
var anchorName []rune
|
|
futureDash := false
|
|
for _, r := range text {
|
|
switch {
|
|
case unicode.IsLetter(r) || unicode.IsNumber(r):
|
|
if futureDash && len(anchorName) > 0 {
|
|
anchorName = append(anchorName, '-')
|
|
}
|
|
futureDash = false
|
|
anchorName = append(anchorName, unicode.ToLower(r))
|
|
default:
|
|
futureDash = true
|
|
}
|
|
}
|
|
return string(anchorName)
|
|
}
|