mirror of
https://github.com/go-gitea/gitea
synced 2024-11-14 14:14:25 +00:00
0d80af649a
* add init support of orgmode document type on file view and readme * fix imports * fix imports and readmeExist * fix imports order * fix format * remove unnecessary convert
804 lines
20 KiB
Go
804 lines
20 KiB
Go
package goorgeous
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import (
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"bufio"
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"bytes"
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"regexp"
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"github.com/russross/blackfriday"
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"github.com/shurcooL/sanitized_anchor_name"
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)
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type inlineParser func(p *parser, out *bytes.Buffer, data []byte, offset int) int
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type footnotes struct {
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id string
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def string
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}
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type parser struct {
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r blackfriday.Renderer
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inlineCallback [256]inlineParser
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notes []footnotes
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}
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// NewParser returns a new parser with the inlineCallbacks required for org content
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func NewParser(renderer blackfriday.Renderer) *parser {
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p := new(parser)
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p.r = renderer
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p.inlineCallback['='] = generateVerbatim
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p.inlineCallback['~'] = generateCode
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p.inlineCallback['/'] = generateEmphasis
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p.inlineCallback['_'] = generateUnderline
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p.inlineCallback['*'] = generateBold
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p.inlineCallback['+'] = generateStrikethrough
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p.inlineCallback['['] = generateLinkOrImg
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return p
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}
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// OrgCommon is the easiest way to parse a byte slice of org content and makes assumptions
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// that the caller wants to use blackfriday's HTMLRenderer with XHTML
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func OrgCommon(input []byte) []byte {
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renderer := blackfriday.HtmlRenderer(blackfriday.HTML_USE_XHTML, "", "")
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return OrgOptions(input, renderer)
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}
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// Org is a convenience name for OrgOptions
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func Org(input []byte, renderer blackfriday.Renderer) []byte {
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return OrgOptions(input, renderer)
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}
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// OrgOptions takes an org content byte slice and a renderer to use
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func OrgOptions(input []byte, renderer blackfriday.Renderer) []byte {
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// in the case that we need to render something in isEmpty but there isn't a new line char
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input = append(input, '\n')
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var output bytes.Buffer
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p := NewParser(renderer)
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scanner := bufio.NewScanner(bytes.NewReader(input))
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// used to capture code blocks
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marker := ""
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syntax := ""
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listType := ""
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inParagraph := false
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inList := false
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inTable := false
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inFixedWidthArea := false
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var tmpBlock bytes.Buffer
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for scanner.Scan() {
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data := scanner.Bytes()
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if !isEmpty(data) && isComment(data) || IsKeyword(data) {
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switch {
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case inList:
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if tmpBlock.Len() > 0 {
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p.generateList(&output, tmpBlock.Bytes(), listType)
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}
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inList = false
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listType = ""
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tmpBlock.Reset()
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case inTable:
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if tmpBlock.Len() > 0 {
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p.generateTable(&output, tmpBlock.Bytes())
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}
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inTable = false
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tmpBlock.Reset()
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case inParagraph:
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if tmpBlock.Len() > 0 {
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p.generateParagraph(&output, tmpBlock.Bytes()[:len(tmpBlock.Bytes())-1])
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}
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inParagraph = false
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tmpBlock.Reset()
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case inFixedWidthArea:
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if tmpBlock.Len() > 0 {
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tmpBlock.WriteString("</pre>\n")
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output.Write(tmpBlock.Bytes())
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}
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inFixedWidthArea = false
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tmpBlock.Reset()
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}
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}
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switch {
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case isEmpty(data):
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switch {
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case inList:
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if tmpBlock.Len() > 0 {
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p.generateList(&output, tmpBlock.Bytes(), listType)
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}
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inList = false
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listType = ""
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tmpBlock.Reset()
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case inTable:
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if tmpBlock.Len() > 0 {
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p.generateTable(&output, tmpBlock.Bytes())
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}
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inTable = false
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tmpBlock.Reset()
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case inParagraph:
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if tmpBlock.Len() > 0 {
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p.generateParagraph(&output, tmpBlock.Bytes()[:len(tmpBlock.Bytes())-1])
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}
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inParagraph = false
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tmpBlock.Reset()
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case inFixedWidthArea:
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if tmpBlock.Len() > 0 {
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tmpBlock.WriteString("</pre>\n")
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output.Write(tmpBlock.Bytes())
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}
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inFixedWidthArea = false
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tmpBlock.Reset()
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case marker != "":
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tmpBlock.WriteByte('\n')
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default:
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continue
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}
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case isPropertyDrawer(data) || marker == "PROPERTIES":
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if marker == "" {
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marker = "PROPERTIES"
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}
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if bytes.Equal(data, []byte(":END:")) {
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marker = ""
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}
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continue
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case isBlock(data) || marker != "":
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matches := reBlock.FindSubmatch(data)
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if len(matches) > 0 {
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if string(matches[1]) == "END" {
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switch marker {
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case "QUOTE":
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var tmpBuf bytes.Buffer
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p.inline(&tmpBuf, tmpBlock.Bytes())
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p.r.BlockQuote(&output, tmpBuf.Bytes())
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case "CENTER":
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var tmpBuf bytes.Buffer
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output.WriteString("<center>\n")
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p.inline(&tmpBuf, tmpBlock.Bytes())
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output.Write(tmpBuf.Bytes())
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output.WriteString("</center>\n")
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default:
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tmpBlock.WriteByte('\n')
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p.r.BlockCode(&output, tmpBlock.Bytes(), syntax)
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}
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marker = ""
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tmpBlock.Reset()
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continue
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}
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}
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if marker != "" {
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if marker != "SRC" && marker != "EXAMPLE" {
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var tmpBuf bytes.Buffer
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tmpBuf.Write([]byte("<p>\n"))
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p.inline(&tmpBuf, data)
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tmpBuf.WriteByte('\n')
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tmpBuf.Write([]byte("</p>\n"))
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tmpBlock.Write(tmpBuf.Bytes())
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} else {
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tmpBlock.WriteByte('\n')
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tmpBlock.Write(data)
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}
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} else {
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marker = string(matches[2])
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syntax = string(matches[3])
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}
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case isFootnoteDef(data):
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matches := reFootnoteDef.FindSubmatch(data)
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for i := range p.notes {
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if p.notes[i].id == string(matches[1]) {
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p.notes[i].def = string(matches[2])
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}
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}
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case isTable(data):
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if inTable != true {
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inTable = true
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}
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tmpBlock.Write(data)
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tmpBlock.WriteByte('\n')
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case IsKeyword(data):
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continue
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case isComment(data):
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p.generateComment(&output, data)
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case isHeadline(data):
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p.generateHeadline(&output, data)
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case isDefinitionList(data):
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if inList != true {
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listType = "dl"
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inList = true
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}
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var work bytes.Buffer
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flags := blackfriday.LIST_TYPE_DEFINITION
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matches := reDefinitionList.FindSubmatch(data)
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flags |= blackfriday.LIST_TYPE_TERM
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p.inline(&work, matches[1])
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p.r.ListItem(&tmpBlock, work.Bytes(), flags)
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work.Reset()
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flags &= ^blackfriday.LIST_TYPE_TERM
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p.inline(&work, matches[2])
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p.r.ListItem(&tmpBlock, work.Bytes(), flags)
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case isUnorderedList(data):
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if inList != true {
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listType = "ul"
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inList = true
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}
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matches := reUnorderedList.FindSubmatch(data)
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var work bytes.Buffer
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p.inline(&work, matches[2])
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p.r.ListItem(&tmpBlock, work.Bytes(), 0)
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case isOrderedList(data):
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if inList != true {
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listType = "ol"
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inList = true
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}
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matches := reOrderedList.FindSubmatch(data)
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var work bytes.Buffer
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tmpBlock.WriteString("<li")
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if len(matches[2]) > 0 {
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tmpBlock.WriteString(" value=\"")
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tmpBlock.Write(matches[2])
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tmpBlock.WriteString("\"")
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matches[3] = matches[3][1:]
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}
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p.inline(&work, matches[3])
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tmpBlock.WriteString(">")
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tmpBlock.Write(work.Bytes())
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tmpBlock.WriteString("</li>\n")
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case isHorizontalRule(data):
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p.r.HRule(&output)
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case isExampleLine(data):
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if inParagraph == true {
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if len(tmpBlock.Bytes()) > 0 {
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p.generateParagraph(&output, tmpBlock.Bytes()[:len(tmpBlock.Bytes())-1])
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inParagraph = false
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}
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tmpBlock.Reset()
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}
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if inFixedWidthArea != true {
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tmpBlock.WriteString("<pre class=\"example\">\n")
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inFixedWidthArea = true
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}
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matches := reExampleLine.FindSubmatch(data)
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tmpBlock.Write(matches[1])
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tmpBlock.WriteString("\n")
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break
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default:
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if inParagraph == false {
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inParagraph = true
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if inFixedWidthArea == true {
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if tmpBlock.Len() > 0 {
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tmpBlock.WriteString("</pre>")
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output.Write(tmpBlock.Bytes())
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}
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inFixedWidthArea = false
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tmpBlock.Reset()
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}
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}
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tmpBlock.Write(data)
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tmpBlock.WriteByte('\n')
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}
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}
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if len(tmpBlock.Bytes()) > 0 {
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if inParagraph == true {
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p.generateParagraph(&output, tmpBlock.Bytes()[:len(tmpBlock.Bytes())-1])
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} else if inFixedWidthArea == true {
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tmpBlock.WriteString("</pre>\n")
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output.Write(tmpBlock.Bytes())
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}
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}
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// Writing footnote def. list
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if len(p.notes) > 0 {
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flags := blackfriday.LIST_ITEM_BEGINNING_OF_LIST
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p.r.Footnotes(&output, func() bool {
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for i := range p.notes {
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p.r.FootnoteItem(&output, []byte(p.notes[i].id), []byte(p.notes[i].def), flags)
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}
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return true
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})
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}
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return output.Bytes()
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}
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// Org Syntax has been broken up into 4 distinct sections based on
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// the org-syntax draft (http://orgmode.org/worg/dev/org-syntax.html):
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// - Headlines
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// - Greater Elements
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// - Elements
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// - Objects
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// Headlines
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func isHeadline(data []byte) bool {
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if !charMatches(data[0], '*') {
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return false
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}
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level := 0
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for level < 6 && charMatches(data[level], '*') {
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level++
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}
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return charMatches(data[level], ' ')
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}
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func (p *parser) generateHeadline(out *bytes.Buffer, data []byte) {
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level := 1
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status := ""
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priority := ""
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for level < 6 && data[level] == '*' {
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level++
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}
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start := skipChar(data, level, ' ')
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data = data[start:]
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i := 0
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// Check if has a status so it can be rendered as a separate span that can be hidden or
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// modified with CSS classes
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if hasStatus(data[i:4]) {
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status = string(data[i:4])
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i += 5 // one extra character for the next whitespace
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}
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// Check if the next byte is a priority marker
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if data[i] == '[' && hasPriority(data[i+1]) {
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priority = string(data[i+1])
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i += 4 // for "[c]" + ' '
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}
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tags, tagsFound := findTags(data, i)
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headlineID := sanitized_anchor_name.Create(string(data[i:]))
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generate := func() bool {
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dataEnd := len(data)
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if tagsFound > 0 {
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dataEnd = tagsFound
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}
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headline := bytes.TrimRight(data[i:dataEnd], " \t")
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if status != "" {
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out.WriteString("<span class=\"todo " + status + "\">" + status + "</span>")
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out.WriteByte(' ')
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}
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if priority != "" {
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out.WriteString("<span class=\"priority " + priority + "\">[" + priority + "]</span>")
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out.WriteByte(' ')
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}
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p.inline(out, headline)
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if tagsFound > 0 {
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for _, tag := range tags {
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out.WriteByte(' ')
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out.WriteString("<span class=\"tags " + tag + "\">" + tag + "</span>")
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out.WriteByte(' ')
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}
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}
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return true
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}
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p.r.Header(out, generate, level, headlineID)
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}
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func hasStatus(data []byte) bool {
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return bytes.Contains(data, []byte("TODO")) || bytes.Contains(data, []byte("DONE"))
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}
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func hasPriority(char byte) bool {
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return (charMatches(char, 'A') || charMatches(char, 'B') || charMatches(char, 'C'))
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}
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func findTags(data []byte, start int) ([]string, int) {
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tags := []string{}
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tagOpener := 0
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tagMarker := tagOpener
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for tIdx := start; tIdx < len(data); tIdx++ {
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if tagMarker > 0 && data[tIdx] == ':' {
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tags = append(tags, string(data[tagMarker+1:tIdx]))
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tagMarker = tIdx
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}
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if data[tIdx] == ':' && tagOpener == 0 && data[tIdx-1] == ' ' {
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tagMarker = tIdx
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tagOpener = tIdx
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}
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}
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return tags, tagOpener
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}
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// Greater Elements
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// ~~ Definition Lists
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var reDefinitionList = regexp.MustCompile(`^\s*-\s+(.+?)\s+::\s+(.*)`)
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func isDefinitionList(data []byte) bool {
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return reDefinitionList.Match(data)
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}
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// ~~ Example lines
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var reExampleLine = regexp.MustCompile(`^\s*:\s(\s*.*)|^\s*:$`)
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func isExampleLine(data []byte) bool {
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return reExampleLine.Match(data)
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}
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// ~~ Ordered Lists
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var reOrderedList = regexp.MustCompile(`^(\s*)\d+\.\s+\[?@?(\d*)\]?(.+)`)
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func isOrderedList(data []byte) bool {
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return reOrderedList.Match(data)
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}
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// ~~ Unordered Lists
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var reUnorderedList = regexp.MustCompile(`^(\s*)[-\+]\s+(.+)`)
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func isUnorderedList(data []byte) bool {
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return reUnorderedList.Match(data)
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}
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// ~~ Tables
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var reTableHeaders = regexp.MustCompile(`^[|+-]*$`)
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func isTable(data []byte) bool {
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return charMatches(data[0], '|')
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}
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func (p *parser) generateTable(output *bytes.Buffer, data []byte) {
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var table bytes.Buffer
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rows := bytes.Split(bytes.Trim(data, "\n"), []byte("\n"))
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hasTableHeaders := len(rows) > 1
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if len(rows) > 1 {
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hasTableHeaders = reTableHeaders.Match(rows[1])
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}
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tbodySet := false
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for idx, row := range rows {
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var rowBuff bytes.Buffer
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if hasTableHeaders && idx == 0 {
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table.WriteString("<thead>")
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for _, cell := range bytes.Split(row[1:len(row)-1], []byte("|")) {
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p.r.TableHeaderCell(&rowBuff, bytes.Trim(cell, " \t"), 0)
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}
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p.r.TableRow(&table, rowBuff.Bytes())
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table.WriteString("</thead>\n")
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} else if hasTableHeaders && idx == 1 {
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continue
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} else {
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if !tbodySet {
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table.WriteString("<tbody>")
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tbodySet = true
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}
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if !reTableHeaders.Match(row) {
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for _, cell := range bytes.Split(row[1:len(row)-1], []byte("|")) {
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var cellBuff bytes.Buffer
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p.inline(&cellBuff, bytes.Trim(cell, " \t"))
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p.r.TableCell(&rowBuff, cellBuff.Bytes(), 0)
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}
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p.r.TableRow(&table, rowBuff.Bytes())
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}
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if tbodySet && idx == len(rows)-1 {
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table.WriteString("</tbody>\n")
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tbodySet = false
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}
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}
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}
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output.WriteString("\n<table>\n")
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output.Write(table.Bytes())
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output.WriteString("</table>\n")
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}
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// ~~ Property Drawers
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func isPropertyDrawer(data []byte) bool {
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return bytes.Equal(data, []byte(":PROPERTIES:"))
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}
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// ~~ Dynamic Blocks
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var reBlock = regexp.MustCompile(`^#\+(BEGIN|END)_(\w+)\s*([0-9A-Za-z_\-]*)?`)
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func isBlock(data []byte) bool {
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return reBlock.Match(data)
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}
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// ~~ Footnotes
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var reFootnoteDef = regexp.MustCompile(`^\[fn:([\w]+)\] +(.+)`)
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func isFootnoteDef(data []byte) bool {
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return reFootnoteDef.Match(data)
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}
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// Elements
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// ~~ Keywords
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func IsKeyword(data []byte) bool {
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return len(data) > 2 && charMatches(data[0], '#') && charMatches(data[1], '+') && !charMatches(data[2], ' ')
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}
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// ~~ Comments
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func isComment(data []byte) bool {
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return charMatches(data[0], '#') && charMatches(data[1], ' ')
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}
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func (p *parser) generateComment(out *bytes.Buffer, data []byte) {
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var work bytes.Buffer
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work.WriteString("<!-- ")
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work.Write(data[2:])
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work.WriteString(" -->")
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work.WriteByte('\n')
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out.Write(work.Bytes())
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}
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// ~~ Horizontal Rules
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var reHorizontalRule = regexp.MustCompile(`^\s*?-----\s?$`)
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func isHorizontalRule(data []byte) bool {
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return reHorizontalRule.Match(data)
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}
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// ~~ Paragraphs
|
|
func (p *parser) generateParagraph(out *bytes.Buffer, data []byte) {
|
|
generate := func() bool {
|
|
p.inline(out, bytes.Trim(data, " "))
|
|
return true
|
|
}
|
|
p.r.Paragraph(out, generate)
|
|
}
|
|
|
|
func (p *parser) generateList(output *bytes.Buffer, data []byte, listType string) {
|
|
generateList := func() bool {
|
|
output.WriteByte('\n')
|
|
p.inline(output, bytes.Trim(data, " "))
|
|
return true
|
|
}
|
|
switch listType {
|
|
case "ul":
|
|
p.r.List(output, generateList, 0)
|
|
case "ol":
|
|
p.r.List(output, generateList, blackfriday.LIST_TYPE_ORDERED)
|
|
case "dl":
|
|
p.r.List(output, generateList, blackfriday.LIST_TYPE_DEFINITION)
|
|
}
|
|
}
|
|
|
|
// Objects
|
|
|
|
func (p *parser) inline(out *bytes.Buffer, data []byte) {
|
|
i, end := 0, 0
|
|
|
|
for i < len(data) {
|
|
for end < len(data) && p.inlineCallback[data[end]] == nil {
|
|
end++
|
|
}
|
|
|
|
p.r.Entity(out, data[i:end])
|
|
|
|
if end >= len(data) {
|
|
break
|
|
}
|
|
i = end
|
|
|
|
handler := p.inlineCallback[data[i]]
|
|
|
|
if consumed := handler(p, out, data, i); consumed > 0 {
|
|
i += consumed
|
|
end = i
|
|
continue
|
|
}
|
|
|
|
end = i + 1
|
|
}
|
|
}
|
|
|
|
func isAcceptablePreOpeningChar(dataIn, data []byte, offset int) bool {
|
|
if len(dataIn) == len(data) {
|
|
return true
|
|
}
|
|
|
|
char := dataIn[offset-1]
|
|
return charMatches(char, ' ') || isPreChar(char)
|
|
}
|
|
|
|
func isPreChar(char byte) bool {
|
|
return charMatches(char, '>') || charMatches(char, '(') || charMatches(char, '{') || charMatches(char, '[')
|
|
}
|
|
|
|
func isAcceptablePostClosingChar(char byte) bool {
|
|
return charMatches(char, ' ') || isTerminatingChar(char)
|
|
}
|
|
|
|
func isTerminatingChar(char byte) bool {
|
|
return charMatches(char, '.') || charMatches(char, ',') || charMatches(char, '?') || charMatches(char, '!') || charMatches(char, ')') || charMatches(char, '}') || charMatches(char, ']')
|
|
}
|
|
|
|
func findLastCharInInline(data []byte, char byte) int {
|
|
timesFound := 0
|
|
last := 0
|
|
// Start from character after the inline indicator
|
|
for i := 1; i < len(data); i++ {
|
|
if timesFound == 1 {
|
|
break
|
|
}
|
|
if data[i] == char {
|
|
if len(data) == i+1 || (len(data) > i+1 && isAcceptablePostClosingChar(data[i+1])) {
|
|
last = i
|
|
timesFound += 1
|
|
}
|
|
}
|
|
}
|
|
return last
|
|
}
|
|
|
|
func generator(p *parser, out *bytes.Buffer, dataIn []byte, offset int, char byte, doInline bool, renderer func(*bytes.Buffer, []byte)) int {
|
|
data := dataIn[offset:]
|
|
c := byte(char)
|
|
start := 1
|
|
i := start
|
|
if len(data) <= 1 {
|
|
return 0
|
|
}
|
|
|
|
lastCharInside := findLastCharInInline(data, c)
|
|
|
|
// Org mode spec says a non-whitespace character must immediately follow.
|
|
// if the current char is the marker, then there's no text between, not a candidate
|
|
if isSpace(data[i]) || lastCharInside == i || !isAcceptablePreOpeningChar(dataIn, data, offset) {
|
|
return 0
|
|
}
|
|
|
|
if lastCharInside > 0 {
|
|
var work bytes.Buffer
|
|
if doInline {
|
|
p.inline(&work, data[start:lastCharInside])
|
|
renderer(out, work.Bytes())
|
|
} else {
|
|
renderer(out, data[start:lastCharInside])
|
|
}
|
|
next := lastCharInside + 1
|
|
return next
|
|
}
|
|
|
|
return 0
|
|
}
|
|
|
|
// ~~ Text Markup
|
|
func generateVerbatim(p *parser, out *bytes.Buffer, data []byte, offset int) int {
|
|
return generator(p, out, data, offset, '=', false, p.r.CodeSpan)
|
|
}
|
|
|
|
func generateCode(p *parser, out *bytes.Buffer, data []byte, offset int) int {
|
|
return generator(p, out, data, offset, '~', false, p.r.CodeSpan)
|
|
}
|
|
|
|
func generateEmphasis(p *parser, out *bytes.Buffer, data []byte, offset int) int {
|
|
return generator(p, out, data, offset, '/', true, p.r.Emphasis)
|
|
}
|
|
|
|
func generateUnderline(p *parser, out *bytes.Buffer, data []byte, offset int) int {
|
|
underline := func(out *bytes.Buffer, text []byte) {
|
|
out.WriteString("<span style=\"text-decoration: underline;\">")
|
|
out.Write(text)
|
|
out.WriteString("</span>")
|
|
}
|
|
|
|
return generator(p, out, data, offset, '_', true, underline)
|
|
}
|
|
|
|
func generateBold(p *parser, out *bytes.Buffer, data []byte, offset int) int {
|
|
return generator(p, out, data, offset, '*', true, p.r.DoubleEmphasis)
|
|
}
|
|
|
|
func generateStrikethrough(p *parser, out *bytes.Buffer, data []byte, offset int) int {
|
|
return generator(p, out, data, offset, '+', true, p.r.StrikeThrough)
|
|
}
|
|
|
|
// ~~ Images and Links (inc. Footnote)
|
|
var reLinkOrImg = regexp.MustCompile(`\[\[(.+?)\]\[?(.*?)\]?\]`)
|
|
|
|
func generateLinkOrImg(p *parser, out *bytes.Buffer, data []byte, offset int) int {
|
|
data = data[offset+1:]
|
|
start := 1
|
|
i := start
|
|
var hyperlink []byte
|
|
isImage := false
|
|
isFootnote := false
|
|
closedLink := false
|
|
hasContent := false
|
|
|
|
if bytes.Equal(data[0:3], []byte("fn:")) {
|
|
isFootnote = true
|
|
} else if data[0] != '[' {
|
|
return 0
|
|
}
|
|
|
|
if bytes.Equal(data[1:6], []byte("file:")) {
|
|
isImage = true
|
|
}
|
|
|
|
for i < len(data) {
|
|
currChar := data[i]
|
|
switch {
|
|
case charMatches(currChar, ']') && closedLink == false:
|
|
if isImage {
|
|
hyperlink = data[start+5 : i]
|
|
} else if isFootnote {
|
|
refid := data[start+2 : i]
|
|
if bytes.Equal(refid, bytes.Trim(refid, " ")) {
|
|
p.notes = append(p.notes, footnotes{string(refid), "DEFINITION NOT FOUND"})
|
|
p.r.FootnoteRef(out, refid, len(p.notes))
|
|
return i + 2
|
|
} else {
|
|
return 0
|
|
}
|
|
} else if bytes.Equal(data[i-4:i], []byte(".org")) {
|
|
orgStart := start
|
|
if bytes.Equal(data[orgStart:orgStart+2], []byte("./")) {
|
|
orgStart = orgStart + 1
|
|
}
|
|
hyperlink = data[orgStart : i-4]
|
|
} else {
|
|
hyperlink = data[start:i]
|
|
}
|
|
closedLink = true
|
|
case charMatches(currChar, '['):
|
|
start = i + 1
|
|
hasContent = true
|
|
case charMatches(currChar, ']') && closedLink == true && hasContent == true && isImage == true:
|
|
p.r.Image(out, hyperlink, data[start:i], data[start:i])
|
|
return i + 3
|
|
case charMatches(currChar, ']') && closedLink == true && hasContent == true:
|
|
var tmpBuf bytes.Buffer
|
|
p.inline(&tmpBuf, data[start:i])
|
|
p.r.Link(out, hyperlink, tmpBuf.Bytes(), tmpBuf.Bytes())
|
|
return i + 3
|
|
case charMatches(currChar, ']') && closedLink == true && hasContent == false && isImage == true:
|
|
p.r.Image(out, hyperlink, hyperlink, hyperlink)
|
|
return i + 2
|
|
case charMatches(currChar, ']') && closedLink == true && hasContent == false:
|
|
p.r.Link(out, hyperlink, hyperlink, hyperlink)
|
|
return i + 2
|
|
}
|
|
i++
|
|
}
|
|
|
|
return 0
|
|
}
|
|
|
|
// Helpers
|
|
func skipChar(data []byte, start int, char byte) int {
|
|
i := start
|
|
for i < len(data) && charMatches(data[i], char) {
|
|
i++
|
|
}
|
|
return i
|
|
}
|
|
|
|
func isSpace(char byte) bool {
|
|
return charMatches(char, ' ')
|
|
}
|
|
|
|
func isEmpty(data []byte) bool {
|
|
if len(data) == 0 {
|
|
return true
|
|
}
|
|
|
|
for i := 0; i < len(data) && !charMatches(data[i], '\n'); i++ {
|
|
if !charMatches(data[i], ' ') && !charMatches(data[i], '\t') {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
func charMatches(a byte, b byte) bool {
|
|
return a == b
|
|
}
|