diff options
Diffstat (limited to 'vendor/github.com/russross/blackfriday/markdown.go')
-rw-r--r-- | vendor/github.com/russross/blackfriday/markdown.go | 926 |
1 files changed, 0 insertions, 926 deletions
diff --git a/vendor/github.com/russross/blackfriday/markdown.go b/vendor/github.com/russross/blackfriday/markdown.go deleted file mode 100644 index 58ba68de..00000000 --- a/vendor/github.com/russross/blackfriday/markdown.go +++ /dev/null @@ -1,926 +0,0 @@ -// -// Blackfriday Markdown Processor -// Available at http://github.com/russross/blackfriday -// -// Copyright © 2011 Russ Ross <russ@russross.com>. -// Distributed under the Simplified BSD License. -// See README.md for details. -// - -// -// -// Markdown parsing and processing -// -// - -// Blackfriday markdown processor. -// -// Translates plain text with simple formatting rules into HTML or LaTeX. -package blackfriday - -import ( - "bytes" - "fmt" - "strings" - "unicode/utf8" -) - -const VERSION = "1.5" - -// These are the supported markdown parsing extensions. -// OR these values together to select multiple extensions. -const ( - EXTENSION_NO_INTRA_EMPHASIS = 1 << iota // ignore emphasis markers inside words - EXTENSION_TABLES // render tables - EXTENSION_FENCED_CODE // render fenced code blocks - EXTENSION_AUTOLINK // detect embedded URLs that are not explicitly marked - EXTENSION_STRIKETHROUGH // strikethrough text using ~~test~~ - EXTENSION_LAX_HTML_BLOCKS // loosen up HTML block parsing rules - EXTENSION_SPACE_HEADERS // be strict about prefix header rules - EXTENSION_HARD_LINE_BREAK // translate newlines into line breaks - EXTENSION_TAB_SIZE_EIGHT // expand tabs to eight spaces instead of four - EXTENSION_FOOTNOTES // Pandoc-style footnotes - EXTENSION_NO_EMPTY_LINE_BEFORE_BLOCK // No need to insert an empty line to start a (code, quote, ordered list, unordered list) block - EXTENSION_HEADER_IDS // specify header IDs with {#id} - EXTENSION_TITLEBLOCK // Titleblock ala pandoc - EXTENSION_AUTO_HEADER_IDS // Create the header ID from the text - EXTENSION_BACKSLASH_LINE_BREAK // translate trailing backslashes into line breaks - EXTENSION_DEFINITION_LISTS // render definition lists - - commonHtmlFlags = 0 | - HTML_USE_XHTML | - HTML_USE_SMARTYPANTS | - HTML_SMARTYPANTS_FRACTIONS | - HTML_SMARTYPANTS_DASHES | - HTML_SMARTYPANTS_LATEX_DASHES - - commonExtensions = 0 | - EXTENSION_NO_INTRA_EMPHASIS | - EXTENSION_TABLES | - EXTENSION_FENCED_CODE | - EXTENSION_AUTOLINK | - EXTENSION_STRIKETHROUGH | - EXTENSION_SPACE_HEADERS | - EXTENSION_HEADER_IDS | - EXTENSION_BACKSLASH_LINE_BREAK | - EXTENSION_DEFINITION_LISTS -) - -// These are the possible flag values for the link renderer. -// Only a single one of these values will be used; they are not ORed together. -// These are mostly of interest if you are writing a new output format. -const ( - LINK_TYPE_NOT_AUTOLINK = iota - LINK_TYPE_NORMAL - LINK_TYPE_EMAIL -) - -// These are the possible flag values for the ListItem renderer. -// Multiple flag values may be ORed together. -// These are mostly of interest if you are writing a new output format. -const ( - LIST_TYPE_ORDERED = 1 << iota - LIST_TYPE_DEFINITION - LIST_TYPE_TERM - LIST_ITEM_CONTAINS_BLOCK - LIST_ITEM_BEGINNING_OF_LIST - LIST_ITEM_END_OF_LIST -) - -// These are the possible flag values for the table cell renderer. -// Only a single one of these values will be used; they are not ORed together. -// These are mostly of interest if you are writing a new output format. -const ( - TABLE_ALIGNMENT_LEFT = 1 << iota - TABLE_ALIGNMENT_RIGHT - TABLE_ALIGNMENT_CENTER = (TABLE_ALIGNMENT_LEFT | TABLE_ALIGNMENT_RIGHT) -) - -// The size of a tab stop. -const ( - TAB_SIZE_DEFAULT = 4 - TAB_SIZE_EIGHT = 8 -) - -// blockTags is a set of tags that are recognized as HTML block tags. -// Any of these can be included in markdown text without special escaping. -var blockTags = map[string]struct{}{ - "blockquote": {}, - "del": {}, - "div": {}, - "dl": {}, - "fieldset": {}, - "form": {}, - "h1": {}, - "h2": {}, - "h3": {}, - "h4": {}, - "h5": {}, - "h6": {}, - "iframe": {}, - "ins": {}, - "math": {}, - "noscript": {}, - "ol": {}, - "pre": {}, - "p": {}, - "script": {}, - "style": {}, - "table": {}, - "ul": {}, - - // HTML5 - "address": {}, - "article": {}, - "aside": {}, - "canvas": {}, - "figcaption": {}, - "figure": {}, - "footer": {}, - "header": {}, - "hgroup": {}, - "main": {}, - "nav": {}, - "output": {}, - "progress": {}, - "section": {}, - "video": {}, -} - -// Renderer is the rendering interface. -// This is mostly of interest if you are implementing a new rendering format. -// -// When a byte slice is provided, it contains the (rendered) contents of the -// element. -// -// When a callback is provided instead, it will write the contents of the -// respective element directly to the output buffer and return true on success. -// If the callback returns false, the rendering function should reset the -// output buffer as though it had never been called. -// -// Currently Html and Latex implementations are provided -type Renderer interface { - // block-level callbacks - BlockCode(out *bytes.Buffer, text []byte, lang string) - BlockQuote(out *bytes.Buffer, text []byte) - BlockHtml(out *bytes.Buffer, text []byte) - Header(out *bytes.Buffer, text func() bool, level int, id string) - HRule(out *bytes.Buffer) - List(out *bytes.Buffer, text func() bool, flags int) - ListItem(out *bytes.Buffer, text []byte, flags int) - Paragraph(out *bytes.Buffer, text func() bool) - Table(out *bytes.Buffer, header []byte, body []byte, columnData []int) - TableRow(out *bytes.Buffer, text []byte) - TableHeaderCell(out *bytes.Buffer, text []byte, flags int) - TableCell(out *bytes.Buffer, text []byte, flags int) - Footnotes(out *bytes.Buffer, text func() bool) - FootnoteItem(out *bytes.Buffer, name, text []byte, flags int) - TitleBlock(out *bytes.Buffer, text []byte) - - // Span-level callbacks - AutoLink(out *bytes.Buffer, link []byte, kind int) - CodeSpan(out *bytes.Buffer, text []byte) - DoubleEmphasis(out *bytes.Buffer, text []byte) - Emphasis(out *bytes.Buffer, text []byte) - Image(out *bytes.Buffer, link []byte, title []byte, alt []byte) - LineBreak(out *bytes.Buffer) - Link(out *bytes.Buffer, link []byte, title []byte, content []byte) - RawHtmlTag(out *bytes.Buffer, tag []byte) - TripleEmphasis(out *bytes.Buffer, text []byte) - StrikeThrough(out *bytes.Buffer, text []byte) - FootnoteRef(out *bytes.Buffer, ref []byte, id int) - - // Low-level callbacks - Entity(out *bytes.Buffer, entity []byte) - NormalText(out *bytes.Buffer, text []byte) - - // Header and footer - DocumentHeader(out *bytes.Buffer) - DocumentFooter(out *bytes.Buffer) - - GetFlags() int -} - -// Callback functions for inline parsing. One such function is defined -// for each character that triggers a response when parsing inline data. -type inlineParser func(p *parser, out *bytes.Buffer, data []byte, offset int) int - -// Parser holds runtime state used by the parser. -// This is constructed by the Markdown function. -type parser struct { - r Renderer - refOverride ReferenceOverrideFunc - refs map[string]*reference - inlineCallback [256]inlineParser - flags int - nesting int - maxNesting int - insideLink bool - - // Footnotes need to be ordered as well as available to quickly check for - // presence. If a ref is also a footnote, it's stored both in refs and here - // in notes. Slice is nil if footnotes not enabled. - notes []*reference -} - -func (p *parser) getRef(refid string) (ref *reference, found bool) { - if p.refOverride != nil { - r, overridden := p.refOverride(refid) - if overridden { - if r == nil { - return nil, false - } - return &reference{ - link: []byte(r.Link), - title: []byte(r.Title), - noteId: 0, - hasBlock: false, - text: []byte(r.Text)}, true - } - } - // refs are case insensitive - ref, found = p.refs[strings.ToLower(refid)] - return ref, found -} - -// -// -// Public interface -// -// - -// Reference represents the details of a link. -// See the documentation in Options for more details on use-case. -type Reference struct { - // Link is usually the URL the reference points to. - Link string - // Title is the alternate text describing the link in more detail. - Title string - // Text is the optional text to override the ref with if the syntax used was - // [refid][] - Text string -} - -// ReferenceOverrideFunc is expected to be called with a reference string and -// return either a valid Reference type that the reference string maps to or -// nil. If overridden is false, the default reference logic will be executed. -// See the documentation in Options for more details on use-case. -type ReferenceOverrideFunc func(reference string) (ref *Reference, overridden bool) - -// Options represents configurable overrides and callbacks (in addition to the -// extension flag set) for configuring a Markdown parse. -type Options struct { - // Extensions is a flag set of bit-wise ORed extension bits. See the - // EXTENSION_* flags defined in this package. - Extensions int - - // ReferenceOverride is an optional function callback that is called every - // time a reference is resolved. - // - // In Markdown, the link reference syntax can be made to resolve a link to - // a reference instead of an inline URL, in one of the following ways: - // - // * [link text][refid] - // * [refid][] - // - // Usually, the refid is defined at the bottom of the Markdown document. If - // this override function is provided, the refid is passed to the override - // function first, before consulting the defined refids at the bottom. If - // the override function indicates an override did not occur, the refids at - // the bottom will be used to fill in the link details. - ReferenceOverride ReferenceOverrideFunc -} - -// MarkdownBasic is a convenience function for simple rendering. -// It processes markdown input with no extensions enabled. -func MarkdownBasic(input []byte) []byte { - // set up the HTML renderer - htmlFlags := HTML_USE_XHTML - renderer := HtmlRenderer(htmlFlags, "", "") - - // set up the parser - return MarkdownOptions(input, renderer, Options{Extensions: 0}) -} - -// Call Markdown with most useful extensions enabled -// MarkdownCommon is a convenience function for simple rendering. -// It processes markdown input with common extensions enabled, including: -// -// * Smartypants processing with smart fractions and LaTeX dashes -// -// * Intra-word emphasis suppression -// -// * Tables -// -// * Fenced code blocks -// -// * Autolinking -// -// * Strikethrough support -// -// * Strict header parsing -// -// * Custom Header IDs -func MarkdownCommon(input []byte) []byte { - // set up the HTML renderer - renderer := HtmlRenderer(commonHtmlFlags, "", "") - return MarkdownOptions(input, renderer, Options{ - Extensions: commonExtensions}) -} - -// Markdown is the main rendering function. -// It parses and renders a block of markdown-encoded text. -// The supplied Renderer is used to format the output, and extensions dictates -// which non-standard extensions are enabled. -// -// To use the supplied Html or LaTeX renderers, see HtmlRenderer and -// LatexRenderer, respectively. -func Markdown(input []byte, renderer Renderer, extensions int) []byte { - return MarkdownOptions(input, renderer, Options{ - Extensions: extensions}) -} - -// MarkdownOptions is just like Markdown but takes additional options through -// the Options struct. -func MarkdownOptions(input []byte, renderer Renderer, opts Options) []byte { - // no point in parsing if we can't render - if renderer == nil { - return nil - } - - extensions := opts.Extensions - - // fill in the render structure - p := new(parser) - p.r = renderer - p.flags = extensions - p.refOverride = opts.ReferenceOverride - p.refs = make(map[string]*reference) - p.maxNesting = 16 - p.insideLink = false - - // register inline parsers - p.inlineCallback['*'] = emphasis - p.inlineCallback['_'] = emphasis - if extensions&EXTENSION_STRIKETHROUGH != 0 { - p.inlineCallback['~'] = emphasis - } - p.inlineCallback['`'] = codeSpan - p.inlineCallback['\n'] = lineBreak - p.inlineCallback['['] = link - p.inlineCallback['<'] = leftAngle - p.inlineCallback['\\'] = escape - p.inlineCallback['&'] = entity - - if extensions&EXTENSION_AUTOLINK != 0 { - p.inlineCallback[':'] = autoLink - } - - if extensions&EXTENSION_FOOTNOTES != 0 { - p.notes = make([]*reference, 0) - } - - first := firstPass(p, input) - second := secondPass(p, first) - return second -} - -// first pass: -// - normalize newlines -// - extract references (outside of fenced code blocks) -// - expand tabs (outside of fenced code blocks) -// - copy everything else -func firstPass(p *parser, input []byte) []byte { - var out bytes.Buffer - tabSize := TAB_SIZE_DEFAULT - if p.flags&EXTENSION_TAB_SIZE_EIGHT != 0 { - tabSize = TAB_SIZE_EIGHT - } - beg := 0 - lastFencedCodeBlockEnd := 0 - for beg < len(input) { - // Find end of this line, then process the line. - end := beg - for end < len(input) && input[end] != '\n' && input[end] != '\r' { - end++ - } - - if p.flags&EXTENSION_FENCED_CODE != 0 { - // track fenced code block boundaries to suppress tab expansion - // and reference extraction inside them: - if beg >= lastFencedCodeBlockEnd { - if i := p.fencedCodeBlock(&out, input[beg:], false); i > 0 { - lastFencedCodeBlockEnd = beg + i - } - } - } - - // add the line body if present - if end > beg { - if end < lastFencedCodeBlockEnd { // Do not expand tabs while inside fenced code blocks. - out.Write(input[beg:end]) - } else if refEnd := isReference(p, input[beg:], tabSize); refEnd > 0 { - beg += refEnd - continue - } else { - expandTabs(&out, input[beg:end], tabSize) - } - } - - if end < len(input) && input[end] == '\r' { - end++ - } - if end < len(input) && input[end] == '\n' { - end++ - } - out.WriteByte('\n') - - beg = end - } - - // empty input? - if out.Len() == 0 { - out.WriteByte('\n') - } - - return out.Bytes() -} - -// second pass: actual rendering -func secondPass(p *parser, input []byte) []byte { - var output bytes.Buffer - - p.r.DocumentHeader(&output) - p.block(&output, input) - - if p.flags&EXTENSION_FOOTNOTES != 0 && len(p.notes) > 0 { - p.r.Footnotes(&output, func() bool { - flags := LIST_ITEM_BEGINNING_OF_LIST - for i := 0; i < len(p.notes); i += 1 { - ref := p.notes[i] - var buf bytes.Buffer - if ref.hasBlock { - flags |= LIST_ITEM_CONTAINS_BLOCK - p.block(&buf, ref.title) - } else { - p.inline(&buf, ref.title) - } - p.r.FootnoteItem(&output, ref.link, buf.Bytes(), flags) - flags &^= LIST_ITEM_BEGINNING_OF_LIST | LIST_ITEM_CONTAINS_BLOCK - } - - return true - }) - } - - p.r.DocumentFooter(&output) - - if p.nesting != 0 { - panic("Nesting level did not end at zero") - } - - return output.Bytes() -} - -// -// Link references -// -// This section implements support for references that (usually) appear -// as footnotes in a document, and can be referenced anywhere in the document. -// The basic format is: -// -// [1]: http://www.google.com/ "Google" -// [2]: http://www.github.com/ "Github" -// -// Anywhere in the document, the reference can be linked by referring to its -// label, i.e., 1 and 2 in this example, as in: -// -// This library is hosted on [Github][2], a git hosting site. -// -// Actual footnotes as specified in Pandoc and supported by some other Markdown -// libraries such as php-markdown are also taken care of. They look like this: -// -// This sentence needs a bit of further explanation.[^note] -// -// [^note]: This is the explanation. -// -// Footnotes should be placed at the end of the document in an ordered list. -// Inline footnotes such as: -// -// Inline footnotes^[Not supported.] also exist. -// -// are not yet supported. - -// References are parsed and stored in this struct. -type reference struct { - link []byte - title []byte - noteId int // 0 if not a footnote ref - hasBlock bool - text []byte -} - -func (r *reference) String() string { - return fmt.Sprintf("{link: %q, title: %q, text: %q, noteId: %d, hasBlock: %v}", - r.link, r.title, r.text, r.noteId, r.hasBlock) -} - -// Check whether or not data starts with a reference link. -// If so, it is parsed and stored in the list of references -// (in the render struct). -// Returns the number of bytes to skip to move past it, -// or zero if the first line is not a reference. -func isReference(p *parser, data []byte, tabSize int) int { - // up to 3 optional leading spaces - if len(data) < 4 { - return 0 - } - i := 0 - for i < 3 && data[i] == ' ' { - i++ - } - - noteId := 0 - - // id part: anything but a newline between brackets - if data[i] != '[' { - return 0 - } - i++ - if p.flags&EXTENSION_FOOTNOTES != 0 { - if i < len(data) && data[i] == '^' { - // we can set it to anything here because the proper noteIds will - // be assigned later during the second pass. It just has to be != 0 - noteId = 1 - i++ - } - } - idOffset := i - for i < len(data) && data[i] != '\n' && data[i] != '\r' && data[i] != ']' { - i++ - } - if i >= len(data) || data[i] != ']' { - return 0 - } - idEnd := i - - // spacer: colon (space | tab)* newline? (space | tab)* - i++ - if i >= len(data) || data[i] != ':' { - return 0 - } - i++ - for i < len(data) && (data[i] == ' ' || data[i] == '\t') { - i++ - } - if i < len(data) && (data[i] == '\n' || data[i] == '\r') { - i++ - if i < len(data) && data[i] == '\n' && data[i-1] == '\r' { - i++ - } - } - for i < len(data) && (data[i] == ' ' || data[i] == '\t') { - i++ - } - if i >= len(data) { - return 0 - } - - var ( - linkOffset, linkEnd int - titleOffset, titleEnd int - lineEnd int - raw []byte - hasBlock bool - ) - - if p.flags&EXTENSION_FOOTNOTES != 0 && noteId != 0 { - linkOffset, linkEnd, raw, hasBlock = scanFootnote(p, data, i, tabSize) - lineEnd = linkEnd - } else { - linkOffset, linkEnd, titleOffset, titleEnd, lineEnd = scanLinkRef(p, data, i) - } - if lineEnd == 0 { - return 0 - } - - // a valid ref has been found - - ref := &reference{ - noteId: noteId, - hasBlock: hasBlock, - } - - if noteId > 0 { - // reusing the link field for the id since footnotes don't have links - ref.link = data[idOffset:idEnd] - // if footnote, it's not really a title, it's the contained text - ref.title = raw - } else { - ref.link = data[linkOffset:linkEnd] - ref.title = data[titleOffset:titleEnd] - } - - // id matches are case-insensitive - id := string(bytes.ToLower(data[idOffset:idEnd])) - - p.refs[id] = ref - - return lineEnd -} - -func scanLinkRef(p *parser, data []byte, i int) (linkOffset, linkEnd, titleOffset, titleEnd, lineEnd int) { - // link: whitespace-free sequence, optionally between angle brackets - if data[i] == '<' { - i++ - } - linkOffset = i - if i == len(data) { - return - } - for i < len(data) && data[i] != ' ' && data[i] != '\t' && data[i] != '\n' && data[i] != '\r' { - i++ - } - linkEnd = i - if data[linkOffset] == '<' && data[linkEnd-1] == '>' { - linkOffset++ - linkEnd-- - } - - // optional spacer: (space | tab)* (newline | '\'' | '"' | '(' ) - for i < len(data) && (data[i] == ' ' || data[i] == '\t') { - i++ - } - if i < len(data) && data[i] != '\n' && data[i] != '\r' && data[i] != '\'' && data[i] != '"' && data[i] != '(' { - return - } - - // compute end-of-line - if i >= len(data) || data[i] == '\r' || data[i] == '\n' { - lineEnd = i - } - if i+1 < len(data) && data[i] == '\r' && data[i+1] == '\n' { - lineEnd++ - } - - // optional (space|tab)* spacer after a newline - if lineEnd > 0 { - i = lineEnd + 1 - for i < len(data) && (data[i] == ' ' || data[i] == '\t') { - i++ - } - } - - // optional title: any non-newline sequence enclosed in '"() alone on its line - if i+1 < len(data) && (data[i] == '\'' || data[i] == '"' || data[i] == '(') { - i++ - titleOffset = i - - // look for EOL - for i < len(data) && data[i] != '\n' && data[i] != '\r' { - i++ - } - if i+1 < len(data) && data[i] == '\n' && data[i+1] == '\r' { - titleEnd = i + 1 - } else { - titleEnd = i - } - - // step back - i-- - for i > titleOffset && (data[i] == ' ' || data[i] == '\t') { - i-- - } - if i > titleOffset && (data[i] == '\'' || data[i] == '"' || data[i] == ')') { - lineEnd = titleEnd - titleEnd = i - } - } - - return -} - -// The first bit of this logic is the same as (*parser).listItem, but the rest -// is much simpler. This function simply finds the entire block and shifts it -// over by one tab if it is indeed a block (just returns the line if it's not). -// blockEnd is the end of the section in the input buffer, and contents is the -// extracted text that was shifted over one tab. It will need to be rendered at -// the end of the document. -func scanFootnote(p *parser, data []byte, i, indentSize int) (blockStart, blockEnd int, contents []byte, hasBlock bool) { - if i == 0 || len(data) == 0 { - return - } - - // skip leading whitespace on first line - for i < len(data) && data[i] == ' ' { - i++ - } - - blockStart = i - - // find the end of the line - blockEnd = i - for 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[blockEnd:i]) - blockEnd = i - - // process the following lines - containsBlankLine := false - -gatherLines: - for blockEnd < 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[blockEnd:i]) > 0 { - containsBlankLine = true - blockEnd = i - continue - } - - n := 0 - if n = isIndented(data[blockEnd:i], indentSize); n == 0 { - // this is the end of the block. - // we don't want to include this last line in the index. - break gatherLines - } - - // if there were blank lines before this one, insert a new one now - if containsBlankLine { - raw.WriteByte('\n') - containsBlankLine = false - } - - // get rid of that first tab, write to buffer - raw.Write(data[blockEnd+n : i]) - hasBlock = true - - blockEnd = i - } - - if data[blockEnd-1] != '\n' { - raw.WriteByte('\n') - } - - contents = raw.Bytes() - - return -} - -// -// -// Miscellaneous helper functions -// -// - -// Test if a character is a punctuation symbol. -// Taken from a private function in regexp in the stdlib. -func ispunct(c byte) bool { - for _, r := range []byte("!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~") { - if c == r { - return true - } - } - return false -} - -// Test if a character is a whitespace character. -func isspace(c byte) bool { - return c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '\f' || c == '\v' -} - -// Test if a character is letter. -func isletter(c byte) bool { - return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') -} - -// Test if a character is a letter or a digit. -// TODO: check when this is looking for ASCII alnum and when it should use unicode -func isalnum(c byte) bool { - return (c >= '0' && c <= '9') || isletter(c) -} - -// Replace tab characters with spaces, aligning to the next TAB_SIZE column. -// always ends output with a newline -func expandTabs(out *bytes.Buffer, line []byte, tabSize int) { - // first, check for common cases: no tabs, or only tabs at beginning of line - i, prefix := 0, 0 - slowcase := false - for i = 0; i < len(line); i++ { - if line[i] == '\t' { - if prefix == i { - prefix++ - } else { - slowcase = true - break - } - } - } - - // no need to decode runes if all tabs are at the beginning of the line - if !slowcase { - for i = 0; i < prefix*tabSize; i++ { - out.WriteByte(' ') - } - out.Write(line[prefix:]) - return - } - - // the slow case: we need to count runes to figure out how - // many spaces to insert for each tab - column := 0 - i = 0 - for i < len(line) { - start := i - for i < len(line) && line[i] != '\t' { - _, size := utf8.DecodeRune(line[i:]) - i += size - column++ - } - - if i > start { - out.Write(line[start:i]) - } - - if i >= len(line) { - break - } - - for { - out.WriteByte(' ') - column++ - if column%tabSize == 0 { - break - } - } - - i++ - } -} - -// Find if a line counts as indented or not. -// Returns number of characters the indent is (0 = not indented). -func isIndented(data []byte, indentSize int) int { - if len(data) == 0 { - return 0 - } - if data[0] == '\t' { - return 1 - } - if len(data) < indentSize { - return 0 - } - for i := 0; i < indentSize; i++ { - if data[i] != ' ' { - return 0 - } - } - return indentSize -} - -// Create a url-safe slug for fragments -func slugify(in []byte) []byte { - if len(in) == 0 { - return in - } - out := make([]byte, 0, len(in)) - sym := false - - for _, ch := range in { - if isalnum(ch) { - sym = false - out = append(out, ch) - } else if sym { - continue - } else { - out = append(out, '-') - sym = true - } - } - var a, b int - var ch byte - for a, ch = range out { - if ch != '-' { - break - } - } - for b = len(out) - 1; b > 0; b-- { - if out[b] != '-' { - break - } - } - return out[a : b+1] -} |