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// Copyright 2015 The Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package markdown
import "strings"
const (
ptRoot = iota
ptList
ptBlockQuote
ptParagraph
ptReference
)
type StateBlock struct {
StateCore
BMarks []int // offsets of the line beginnings
EMarks []int // offsets of the line endings
TShift []int // indents for each line
SCount []int
BSCount []int
BlkIndent int // required block content indent (in a list etc.)
Line int // line index in the source string
LineMax int // number of lines
Tight bool // loose or tight mode for lists
ParentType byte // parent block type
Level int
}
func (s *StateBlock) IsLineEmpty(n int) bool {
return s.BMarks[n]+s.TShift[n] >= s.EMarks[n]
}
func (s *StateBlock) SkipEmptyLines(from int) int {
for from < s.LineMax && s.IsLineEmpty(from) {
from++
}
return from
}
func (s *StateBlock) SkipSpaces(pos int) int {
src := s.Src
for pos < len(src) && byteIsSpace(src[pos]) {
pos++
}
return pos
}
func (s *StateBlock) SkipBytes(pos int, b byte) int {
src := s.Src
for pos < len(src) && src[pos] == b {
pos++
}
return pos
}
func (s *StateBlock) SkipBytesBack(pos int, b byte, min int) int {
for pos > min {
pos--
if s.Src[pos] != b {
return pos + 1
}
}
return pos
}
func (s *StateBlock) SkipSpacesBack(pos int, min int) int {
for pos > min {
pos--
if !byteIsSpace(s.Src[pos]) {
return pos + 1
}
}
return pos
}
func (s *StateBlock) Lines(begin, end, indent int, keepLastLf bool) string {
if begin == end {
return ""
}
src := s.Src
queue := make([]string, end-begin)
for i, line := 0, begin; line < end; i, line = i+1, line+1 {
lineIndent := 0
lineStart := s.BMarks[line]
first := lineStart
last := s.EMarks[line]
if (line+1 < end || keepLastLf) && last < len(src) {
last++
}
for first < last && lineIndent < indent {
ch := src[first]
if byteIsSpace(ch) {
if ch == '\t' {
lineIndent += 4 - (lineIndent+s.BSCount[line])%4
} else {
lineIndent++
}
} else if first-lineStart < s.TShift[line] {
lineIndent++
} else {
break
}
first++
}
if lineIndent > indent {
queue[i] = strings.Repeat(" ", lineIndent-indent) + src[first:last]
} else {
queue[i] = src[first:last]
}
}
return strings.Join(queue, "")
}
func (s *StateBlock) PushToken(tok Token) {
tok.SetLevel(s.Level)
s.Tokens = append(s.Tokens, tok)
}
func (s *StateBlock) PushOpeningToken(tok Token) {
tok.SetLevel(s.Level)
s.Level++
s.Tokens = append(s.Tokens, tok)
}
func (s *StateBlock) PushClosingToken(tok Token) {
s.Level--
tok.SetLevel(s.Level)
s.Tokens = append(s.Tokens, tok)
}
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