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/** internal
* class ParserInline
*
* Tokenizes paragraph content.
**/
import Ruler from './ruler.mjs'
import StateInline from './rules_inline/state_inline.mjs'
import r_text from './rules_inline/text.mjs'
import r_linkify from './rules_inline/linkify.mjs'
import r_newline from './rules_inline/newline.mjs'
import r_escape from './rules_inline/escape.mjs'
import r_backticks from './rules_inline/backticks.mjs'
import r_strikethrough from './rules_inline/strikethrough.mjs'
import r_emphasis from './rules_inline/emphasis.mjs'
import r_link from './rules_inline/link.mjs'
import r_image from './rules_inline/image.mjs'
import r_autolink from './rules_inline/autolink.mjs'
import r_html_inline from './rules_inline/html_inline.mjs'
import r_entity from './rules_inline/entity.mjs'
import r_balance_pairs from './rules_inline/balance_pairs.mjs'
import r_fragments_join from './rules_inline/fragments_join.mjs'
// Parser rules
const _rules = [
['text', r_text],
['linkify', r_linkify],
['newline', r_newline],
['escape', r_escape],
['backticks', r_backticks],
['strikethrough', r_strikethrough.tokenize],
['emphasis', r_emphasis.tokenize],
['link', r_link],
['image', r_image],
['autolink', r_autolink],
['html_inline', r_html_inline],
['entity', r_entity]
]
// `rule2` ruleset was created specifically for emphasis/strikethrough
// post-processing and may be changed in the future.
//
// Don't use this for anything except pairs (plugins working with `balance_pairs`).
//
const _rules2 = [
['balance_pairs', r_balance_pairs],
['strikethrough', r_strikethrough.postProcess],
['emphasis', r_emphasis.postProcess],
// rules for pairs separate '**' into its own text tokens, which may be left unused,
// rule below merges unused segments back with the rest of the text
['fragments_join', r_fragments_join]
]
/**
* new ParserInline()
**/
function ParserInline () {
/**
* ParserInline#ruler -> Ruler
*
* [[Ruler]] instance. Keep configuration of inline rules.
**/
this.ruler = new Ruler()
for (let i = 0; i < _rules.length; i++) {
this.ruler.push(_rules[i][0], _rules[i][1])
}
/**
* ParserInline#ruler2 -> Ruler
*
* [[Ruler]] instance. Second ruler used for post-processing
* (e.g. in emphasis-like rules).
**/
this.ruler2 = new Ruler()
for (let i = 0; i < _rules2.length; i++) {
this.ruler2.push(_rules2[i][0], _rules2[i][1])
}
}
// Skip single token by running all rules in validation mode;
// returns `true` if any rule reported success
//
ParserInline.prototype.skipToken = function (state) {
const pos = state.pos
const rules = this.ruler.getRules('')
const len = rules.length
const maxNesting = state.md.options.maxNesting
const cache = state.cache
if (typeof cache[pos] !== 'undefined') {
state.pos = cache[pos]
return
}
let ok = false
if (state.level < maxNesting) {
for (let i = 0; i < len; i++) {
// Increment state.level and decrement it later to limit recursion.
// It's harmless to do here, because no tokens are created. But ideally,
// we'd need a separate private state variable for this purpose.
//
state.level++
ok = rules[i](state, true)
state.level--
if (ok) {
if (pos >= state.pos) { throw new Error("inline rule didn't increment state.pos") }
break
}
}
} else {
// Too much nesting, just skip until the end of the paragraph.
//
// NOTE: this will cause links to behave incorrectly in the following case,
// when an amount of `[` is exactly equal to `maxNesting + 1`:
//
// [[[[[[[[[[[[[[[[[[[[[foo]()
//
// TODO: remove this workaround when CM standard will allow nested links
// (we can replace it by preventing links from being parsed in
// validation mode)
//
state.pos = state.posMax
}
if (!ok) { state.pos++ }
cache[pos] = state.pos
}
// Generate tokens for input range
//
ParserInline.prototype.tokenize = function (state) {
const rules = this.ruler.getRules('')
const len = rules.length
const end = state.posMax
const maxNesting = state.md.options.maxNesting
while (state.pos < end) {
// Try all possible rules.
// On success, rule should:
//
// - update `state.pos`
// - update `state.tokens`
// - return true
const prevPos = state.pos
let ok = false
if (state.level < maxNesting) {
for (let i = 0; i < len; i++) {
ok = rules[i](state, false)
if (ok) {
if (prevPos >= state.pos) { throw new Error("inline rule didn't increment state.pos") }
break
}
}
}
if (ok) {
if (state.pos >= end) { break }
continue
}
state.pending += state.src[state.pos++]
}
if (state.pending) {
state.pushPending()
}
}
/**
* ParserInline.parse(str, md, env, outTokens)
*
* Process input string and push inline tokens into `outTokens`
**/
ParserInline.prototype.parse = function (str, md, env, outTokens) {
const state = new this.State(str, md, env, outTokens)
this.tokenize(state)
const rules = this.ruler2.getRules('')
const len = rules.length
for (let i = 0; i < len; i++) {
rules[i](state)
}
}
ParserInline.prototype.State = StateInline
export default ParserInline
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