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* add markdown parser(簡易版) * modify for wasm
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| package markdown | ||
|
|
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| type Markdown struct { | ||
| hierarchy uint | ||
| text string | ||
| } | ||
|
|
||
| func (m *Markdown) Hierarchy() uint { | ||
| return m.hierarchy | ||
| } | ||
|
|
||
| func (m *Markdown) Text() string { | ||
| return m.text | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,170 @@ | ||
| package markdown | ||
|
|
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| import ( | ||
| "errors" | ||
| "strings" | ||
| ) | ||
|
|
||
| // 一旦簡易なパーサー | ||
| type Parser struct { | ||
| // rootが#要素かフラグ | ||
| // #であれば次の#までのhierarchyは+=1 | ||
| isSharpRoot bool | ||
| spaces int | ||
| sep string | ||
| } | ||
|
|
||
| // TODO: 要リファクタ | ||
| func NewParser(spaces int) *Parser { | ||
| sep := space | ||
| if spaces == 1 { | ||
| sep = tab | ||
| } | ||
|
|
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| return &Parser{ | ||
| spaces: spaces, | ||
| sep: sep, | ||
| } | ||
| } | ||
|
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| const ( | ||
| sharp = "#" | ||
|
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| hyphen = "-" | ||
| asterisk = "*" | ||
| plus = "+" | ||
|
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| space = " " | ||
| tab = "\t" | ||
| ) | ||
|
|
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| const ( | ||
| rootHierarchyNum uint = 1 | ||
| ) | ||
|
|
||
| var ( | ||
| ErrBlankLine = errors.New("blank line") | ||
| ErrEmptyText = errors.New("empty text") | ||
| ErrIncorrectFormat = errors.New("incorrect input format") | ||
| ) | ||
|
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| // TODO: 要リファクタ | ||
| func (p *Parser) Parse(row string) (*Markdown, error) { | ||
| // 空行か否か | ||
| if p.isEmpty(row) { | ||
| return nil, ErrBlankLine | ||
| } | ||
|
|
||
| if strings.HasPrefix(row, sharp) { | ||
| p.isSharpRoot = true | ||
|
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| _, after, found := strings.Cut(row, sharp) | ||
| if !found { | ||
| return nil, ErrIncorrectFormat | ||
| } | ||
| text := strings.TrimLeft(after, sharp) | ||
| text = strings.Trim(text, space) | ||
| if len(text) == 0 { | ||
| return nil, ErrEmptyText | ||
| } | ||
|
|
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| return &Markdown{ | ||
| hierarchy: rootHierarchyNum, | ||
| text: text, | ||
| }, nil | ||
| } | ||
|
|
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| // #のセクション内 | ||
| if p.isSharpRoot { | ||
| spaceCount, afterText, err := p.separateRow(row) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| text := strings.TrimPrefix(afterText, space) | ||
| if len(text) == 0 { | ||
| return nil, ErrEmptyText | ||
| } | ||
|
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| hierarchy := p.calculateHierarchy(spaceCount) | ||
| return &Markdown{ | ||
| hierarchy: hierarchy, | ||
| text: text, | ||
| }, nil | ||
| } | ||
|
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| spaceCount, afterText, err := p.separateRow(row) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| text := strings.TrimPrefix(afterText, space) | ||
| if len(text) == 0 { | ||
| return nil, ErrEmptyText | ||
| } | ||
|
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| hierarchy := p.calculateHierarchy(spaceCount) | ||
| return &Markdown{ | ||
| hierarchy: hierarchy, | ||
| text: text, | ||
| }, nil | ||
| } | ||
|
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| func (p *Parser) isEmpty(row string) bool { | ||
| r := strings.TrimSpace(row) | ||
| return len(r) == 0 | ||
| } | ||
|
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| func (p *Parser) validSpaces(spaceCount int) error { | ||
| if p.isTab() { | ||
| return nil | ||
| } | ||
| if spaceCount%p.spaces != 0 { | ||
| return ErrIncorrectFormat | ||
| } | ||
| return nil | ||
| } | ||
|
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| func (p *Parser) calculateHierarchy(spaceCount int) uint { | ||
| var hierarchy uint | ||
| if p.isTab() { | ||
| hierarchy = uint(spaceCount) + rootHierarchyNum | ||
| } else { | ||
| hierarchy = uint(spaceCount/p.spaces) + rootHierarchyNum | ||
| } | ||
|
|
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| if p.isSharpRoot { | ||
| hierarchy += 1 | ||
| } | ||
| return hierarchy | ||
| } | ||
|
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| func (p *Parser) isTab() bool { | ||
| return p.spaces == 1 | ||
| } | ||
|
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| var listSymbols = []string{hyphen, asterisk, plus} | ||
|
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| func (p *Parser) separateRow(row string) (int, string, error) { | ||
| var err error | ||
| for _, symbol := range listSymbols { | ||
| before, after, found := strings.Cut(row, symbol) | ||
| if !found { | ||
| err = ErrIncorrectFormat | ||
| continue | ||
| } | ||
| spaceCount := strings.Count(before, p.sep) | ||
| if spaceCount != len(before) { | ||
| err = ErrIncorrectFormat | ||
| continue | ||
| } | ||
| if e := p.validSpaces(spaceCount); e != nil { | ||
| err = e | ||
| continue | ||
| } | ||
|
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| return spaceCount, after, nil | ||
| } | ||
|
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| return 0, "", err | ||
| } |
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