gtsocial-umbx

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paragraph.go (1704B)

      1 package parser
      2 
      3 import (
      4 	"github.com/yuin/goldmark/ast"
      5 	"github.com/yuin/goldmark/text"
      6 	"github.com/yuin/goldmark/util"
      7 )
      8 
      9 type paragraphParser struct {
     10 }
     11 
     12 var defaultParagraphParser = &paragraphParser{}
     13 
     14 // NewParagraphParser returns a new BlockParser that
     15 // parses paragraphs.
     16 func NewParagraphParser() BlockParser {
     17 	return defaultParagraphParser
     18 }
     19 
     20 func (b *paragraphParser) Trigger() []byte {
     21 	return nil
     22 }
     23 
     24 func (b *paragraphParser) Open(parent ast.Node, reader text.Reader, pc Context) (ast.Node, State) {
     25 	_, segment := reader.PeekLine()
     26 	segment = segment.TrimLeftSpace(reader.Source())
     27 	if segment.IsEmpty() {
     28 		return nil, NoChildren
     29 	}
     30 	node := ast.NewParagraph()
     31 	node.Lines().Append(segment)
     32 	reader.Advance(segment.Len() - 1)
     33 	return node, NoChildren
     34 }
     35 
     36 func (b *paragraphParser) Continue(node ast.Node, reader text.Reader, pc Context) State {
     37 	line, segment := reader.PeekLine()
     38 	if util.IsBlank(line) {
     39 		return Close
     40 	}
     41 	node.Lines().Append(segment)
     42 	reader.Advance(segment.Len() - 1)
     43 	return Continue | NoChildren
     44 }
     45 
     46 func (b *paragraphParser) Close(node ast.Node, reader text.Reader, pc Context) {
     47 	lines := node.Lines()
     48 	if lines.Len() != 0 {
     49 		// trim leading spaces
     50 		for i := 0; i < lines.Len(); i++ {
     51 			l := lines.At(i)
     52 			lines.Set(i, l.TrimLeftSpace(reader.Source()))
     53 		}
     54 
     55 		// trim trailing spaces
     56 		length := lines.Len()
     57 		lastLine := node.Lines().At(length - 1)
     58 		node.Lines().Set(length-1, lastLine.TrimRightSpace(reader.Source()))
     59 	}
     60 	if lines.Len() == 0 {
     61 		node.Parent().RemoveChild(node.Parent(), node)
     62 		return
     63 	}
     64 }
     65 
     66 func (b *paragraphParser) CanInterruptParagraph() bool {
     67 	return false
     68 }
     69 
     70 func (b *paragraphParser) CanAcceptIndentedLine() bool {
     71 	return false
     72 }