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/** internal
* class ParserBlock
*
* Block-level tokenizer.
**/
import Ruler from './ruler.mjs'
import StateBlock from './rules_block/state_block.mjs'
import r_table from './rules_block/table.mjs'
import r_code from './rules_block/code.mjs'
import r_fence from './rules_block/fence.mjs'
import r_blockquote from './rules_block/blockquote.mjs'
import r_hr from './rules_block/hr.mjs'
import r_list from './rules_block/list.mjs'
import r_reference from './rules_block/reference.mjs'
import r_html_block from './rules_block/html_block.mjs'
import r_heading from './rules_block/heading.mjs'
import r_lheading from './rules_block/lheading.mjs'
import r_paragraph from './rules_block/paragraph.mjs'
const _rules = [
// First 2 params - rule name & source. Secondary array - list of rules,
// which can be terminated by this one.
['table', r_table, ['paragraph', 'reference']],
['code', r_code],
['fence', r_fence, ['paragraph', 'reference', 'blockquote', 'list']],
['blockquote', r_blockquote, ['paragraph', 'reference', 'blockquote', 'list']],
['hr', r_hr, ['paragraph', 'reference', 'blockquote', 'list']],
['list', r_list, ['paragraph', 'reference', 'blockquote']],
['reference', r_reference],
['html_block', r_html_block, ['paragraph', 'reference', 'blockquote']],
['heading', r_heading, ['paragraph', 'reference', 'blockquote']],
['lheading', r_lheading],
['paragraph', r_paragraph]
]
/**
* new ParserBlock()
**/
function ParserBlock () {
/**
* ParserBlock#ruler -> Ruler
*
* [[Ruler]] instance. Keep configuration of block rules.
**/
this.ruler = new Ruler()
for (let i = 0; i < _rules.length; i++) {
this.ruler.push(_rules[i][0], _rules[i][1], { alt: (_rules[i][2] || []).slice() })
}
}
// Generate tokens for input range
//
ParserBlock.prototype.tokenize = function (state, startLine, endLine) {
const rules = this.ruler.getRules('')
const len = rules.length
const maxNesting = state.md.options.maxNesting
let line = startLine
let hasEmptyLines = false
while (line < endLine) {
state.line = line = state.skipEmptyLines(line)
if (line >= endLine) { break }
// Termination condition for nested calls.
// Nested calls currently used for blockquotes & lists
if (state.sCount[line] < state.blkIndent) { break }
// If nesting level exceeded - skip tail to the end. That's not ordinary
// situation and we should not care about content.
if (state.level >= maxNesting) {
state.line = endLine
break
}
// Try all possible rules.
// On success, rule should:
//
// - update `state.line`
// - update `state.tokens`
// - return true
const prevLine = state.line
let ok = false
for (let i = 0; i < len; i++) {
ok = rules[i](state, line, endLine, false)
if (ok) {
if (prevLine >= state.line) {
throw new Error("block rule didn't increment state.line")
}
break
}
}
// this can only happen if user disables paragraph rule
if (!ok) throw new Error('none of the block rules matched')
// set state.tight if we had an empty line before current tag
// i.e. latest empty line should not count
state.tight = !hasEmptyLines
// paragraph might "eat" one newline after it in nested lists
if (state.isEmpty(state.line - 1)) {
hasEmptyLines = true
}
line = state.line
if (line < endLine && state.isEmpty(line)) {
hasEmptyLines = true
line++
state.line = line
}
}
}
/**
* ParserBlock.parse(str, md, env, outTokens)
*
* Process input string and push block tokens into `outTokens`
**/
ParserBlock.prototype.parse = function (src, md, env, outTokens) {
if (!src) { return }
const state = new this.State(src, md, env, outTokens)
this.tokenize(state, state.line, state.lineMax)
}
ParserBlock.prototype.State = StateBlock
export default ParserBlock
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