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// Parser state class
import Token from '../token.mjs'
import { isSpace } from '../common/utils.mjs'
function StateBlock (src, md, env, tokens) {
this.src = src
// link to parser instance
this.md = md
this.env = env
//
// Internal state vartiables
//
this.tokens = tokens
this.bMarks = [] // line begin offsets for fast jumps
this.eMarks = [] // line end offsets for fast jumps
this.tShift = [] // offsets of the first non-space characters (tabs not expanded)
this.sCount = [] // indents for each line (tabs expanded)
// An amount of virtual spaces (tabs expanded) between beginning
// of each line (bMarks) and real beginning of that line.
//
// It exists only as a hack because blockquotes override bMarks
// losing information in the process.
//
// It's used only when expanding tabs, you can think about it as
// an initial tab length, e.g. bsCount=21 applied to string `\t123`
// means first tab should be expanded to 4-21%4 === 3 spaces.
//
this.bsCount = []
// block parser variables
// required block content indent (for example, if we are
// inside a list, it would be positioned after list marker)
this.blkIndent = 0
this.line = 0 // line index in src
this.lineMax = 0 // lines count
this.tight = false // loose/tight mode for lists
this.ddIndent = -1 // indent of the current dd block (-1 if there isn't any)
this.listIndent = -1 // indent of the current list block (-1 if there isn't any)
// can be 'blockquote', 'list', 'root', 'paragraph' or 'reference'
// used in lists to determine if they interrupt a paragraph
this.parentType = 'root'
this.level = 0
// Create caches
// Generate markers.
const s = this.src
for (let start = 0, pos = 0, indent = 0, offset = 0, len = s.length, indent_found = false; pos < len; pos++) {
const ch = s.charCodeAt(pos)
if (!indent_found) {
if (isSpace(ch)) {
indent++
if (ch === 0x09) {
offset += 4 - offset % 4
} else {
offset++
}
continue
} else {
indent_found = true
}
}
if (ch === 0x0A || pos === len - 1) {
if (ch !== 0x0A) { pos++ }
this.bMarks.push(start)
this.eMarks.push(pos)
this.tShift.push(indent)
this.sCount.push(offset)
this.bsCount.push(0)
indent_found = false
indent = 0
offset = 0
start = pos + 1
}
}
// Push fake entry to simplify cache bounds checks
this.bMarks.push(s.length)
this.eMarks.push(s.length)
this.tShift.push(0)
this.sCount.push(0)
this.bsCount.push(0)
this.lineMax = this.bMarks.length - 1 // don't count last fake line
}
// Push new token to "stream".
//
StateBlock.prototype.push = function (type, tag, nesting) {
const token = new Token(type, tag, nesting)
token.block = true
if (nesting < 0) this.level-- // closing tag
token.level = this.level
if (nesting > 0) this.level++ // opening tag
this.tokens.push(token)
return token
}
StateBlock.prototype.isEmpty = function isEmpty (line) {
return this.bMarks[line] + this.tShift[line] >= this.eMarks[line]
}
StateBlock.prototype.skipEmptyLines = function skipEmptyLines (from) {
for (let max = this.lineMax; from < max; from++) {
if (this.bMarks[from] + this.tShift[from] < this.eMarks[from]) {
break
}
}
return from
}
// Skip spaces from given position.
StateBlock.prototype.skipSpaces = function skipSpaces (pos) {
for (let max = this.src.length; pos < max; pos++) {
const ch = this.src.charCodeAt(pos)
if (!isSpace(ch)) { break }
}
return pos
}
// Skip spaces from given position in reverse.
StateBlock.prototype.skipSpacesBack = function skipSpacesBack (pos, min) {
if (pos <= min) { return pos }
while (pos > min) {
if (!isSpace(this.src.charCodeAt(--pos))) { return pos + 1 }
}
return pos
}
// Skip char codes from given position
StateBlock.prototype.skipChars = function skipChars (pos, code) {
for (let max = this.src.length; pos < max; pos++) {
if (this.src.charCodeAt(pos) !== code) { break }
}
return pos
}
// Skip char codes reverse from given position - 1
StateBlock.prototype.skipCharsBack = function skipCharsBack (pos, code, min) {
if (pos <= min) { return pos }
while (pos > min) {
if (code !== this.src.charCodeAt(--pos)) { return pos + 1 }
}
return pos
}
// cut lines range from source.
StateBlock.prototype.getLines = function getLines (begin, end, indent, keepLastLF) {
if (begin >= end) {
return ''
}
const queue = new Array(end - begin)
for (let i = 0, line = begin; line < end; line++, i++) {
let lineIndent = 0
const lineStart = this.bMarks[line]
let first = lineStart
let last
if (line + 1 < end || keepLastLF) {
// No need for bounds check because we have fake entry on tail.
last = this.eMarks[line] + 1
} else {
last = this.eMarks[line]
}
while (first < last && lineIndent < indent) {
const ch = this.src.charCodeAt(first)
if (isSpace(ch)) {
if (ch === 0x09) {
lineIndent += 4 - (lineIndent + this.bsCount[line]) % 4
} else {
lineIndent++
}
} else if (first - lineStart < this.tShift[line]) {
// patched tShift masked characters to look like spaces (blockquotes, list markers)
lineIndent++
} else {
break
}
first++
}
if (lineIndent > indent) {
// partially expanding tabs in code blocks, e.g '\t\tfoobar'
// with indent=2 becomes ' \tfoobar'
queue[i] = new Array(lineIndent - indent + 1).join(' ') + this.src.slice(first, last)
} else {
queue[i] = this.src.slice(first, last)
}
}
return queue.join('')
}
// re-export Token class to use in block rules
StateBlock.prototype.Token = Token
export default StateBlock
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