thematic_break.go

Documentation: github.com/yuin/goldmark/parser

     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 thematicBreakPraser struct {
    10  }
    11  
    12  var defaultThematicBreakPraser = &thematicBreakPraser{}
    13  
    14  // NewThematicBreakParser returns a new BlockParser that
    15  // parses thematic breaks.
    16  func NewThematicBreakParser() BlockParser {
    17  	return defaultThematicBreakPraser
    18  }
    19  
    20  func isThematicBreak(line []byte, offset int) bool {
    21  	w, pos := util.IndentWidth(line, offset)
    22  	if w > 3 {
    23  		return false
    24  	}
    25  	mark := byte(0)
    26  	count := 0
    27  	for i := pos; i < len(line); i++ {
    28  		c := line[i]
    29  		if util.IsSpace(c) {
    30  			continue
    31  		}
    32  		if mark == 0 {
    33  			mark = c
    34  			count = 1
    35  			if mark == '*' || mark == '-' || mark == '_' {
    36  				continue
    37  			}
    38  			return false
    39  		}
    40  		if c != mark {
    41  			return false
    42  		}
    43  		count++
    44  	}
    45  	return count > 2
    46  }
    47  
    48  func (b *thematicBreakPraser) Trigger() []byte {
    49  	return []byte{'-', '*', '_'}
    50  }
    51  
    52  func (b *thematicBreakPraser) Open(parent ast.Node, reader text.Reader, pc Context) (ast.Node, State) {
    53  	line, segment := reader.PeekLine()
    54  	if isThematicBreak(line, reader.LineOffset()) {
    55  		reader.Advance(segment.Len() - 1)
    56  		return ast.NewThematicBreak(), NoChildren
    57  	}
    58  	return nil, NoChildren
    59  }
    60  
    61  func (b *thematicBreakPraser) Continue(node ast.Node, reader text.Reader, pc Context) State {
    62  	return Close
    63  }
    64  
    65  func (b *thematicBreakPraser) Close(node ast.Node, reader text.Reader, pc Context) {
    66  	// nothing to do
    67  }
    68  
    69  func (b *thematicBreakPraser) CanInterruptParagraph() bool {
    70  	return true
    71  }
    72  
    73  func (b *thematicBreakPraser) CanAcceptIndentedLine() bool {
    74  	return false
    75  }
    76
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