1package parser
 2
 3import (
 4	"github.com/yuin/goldmark/ast"
 5	"github.com/yuin/goldmark/text"
 6	"github.com/yuin/goldmark/util"
 7)
 8
 9type paragraphParser struct {
10}
11
12var defaultParagraphParser = &paragraphParser{}
13
14// NewParagraphParser returns a new BlockParser that
15// parses paragraphs.
16func NewParagraphParser() BlockParser {
17	return defaultParagraphParser
18}
19
20func (b *paragraphParser) Trigger() []byte {
21	return nil
22}
23
24func (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
36func (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
46func (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
66func (b *paragraphParser) CanInterruptParagraph() bool {
67	return false
68}
69
70func (b *paragraphParser) CanAcceptIndentedLine() bool {
71	return false
72}