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import { defaults } from './defaults.js';
import {
rtrim,
splitCells,
escape,
findClosingBracket
} from './helpers.js';
function outputLink(cap, link, raw, lexer) {
const href = link.href;
const title = link.title ? escape(link.title) : null;
const text = cap[1].replace(/\\([\[\]])/g, '$1');
if (cap[0].charAt(0) !== '!') {
lexer.state.inLink = true;
const token = {
type: 'link',
raw,
href,
title,
text,
tokens: lexer.inlineTokens(text)
};
lexer.state.inLink = false;
return token;
}
return {
type: 'image',
raw,
href,
title,
text: escape(text)
};
}
function indentCodeCompensation(raw, text) {
const matchIndentToCode = raw.match(/^(\s+)(?:```)/);
if (matchIndentToCode === null) {
return text;
}
const indentToCode = matchIndentToCode[1];
return text
.split('\n')
.map(node => {
const matchIndentInNode = node.match(/^\s+/);
if (matchIndentInNode === null) {
return node;
}
const [indentInNode] = matchIndentInNode;
if (indentInNode.length >= indentToCode.length) {
return node.slice(indentToCode.length);
}
return node;
})
.join('\n');
}
/**
* Tokenizer
*/
export class Tokenizer {
constructor(options) {
this.options = options || defaults;
}
space(src) {
const cap = this.rules.block.newline.exec(src);
if (cap && cap[0].length > 0) {
return {
type: 'space',
raw: cap[0]
};
}
}
code(src) {
const cap = this.rules.block.code.exec(src);
if (cap) {
const text = cap[0].replace(/^ {1,4}/gm, '');
return {
type: 'code',
raw: cap[0],
codeBlockStyle: 'indented',
text: !this.options.pedantic
? rtrim(text, '\n')
: text
};
}
}
fences(src) {
const cap = this.rules.block.fences.exec(src);
if (cap) {
const raw = cap[0];
const text = indentCodeCompensation(raw, cap[3] || '');
return {
type: 'code',
raw,
lang: cap[2] ? cap[2].trim().replace(this.rules.inline._escapes, '$1') : cap[2],
text
};
}
}
heading(src) {
const cap = this.rules.block.heading.exec(src);
if (cap) {
let text = cap[2].trim();
// remove trailing #s
if (/#$/.test(text)) {
const trimmed = rtrim(text, '#');
if (this.options.pedantic) {
text = trimmed.trim();
} else if (!trimmed || / $/.test(trimmed)) {
// CommonMark requires space before trailing #s
text = trimmed.trim();
}
}
return {
type: 'heading',
raw: cap[0],
depth: cap[1].length,
text,
tokens: this.lexer.inline(text)
};
}
}
hr(src) {
const cap = this.rules.block.hr.exec(src);
if (cap) {
return {
type: 'hr',
raw: cap[0]
};
}
}
blockquote(src) {
const cap = this.rules.block.blockquote.exec(src);
if (cap) {
const text = cap[0].replace(/^ *>[ \t]?/gm, '');
const top = this.lexer.state.top;
this.lexer.state.top = true;
const tokens = this.lexer.blockTokens(text);
this.lexer.state.top = top;
return {
type: 'blockquote',
raw: cap[0],
tokens,
text
};
}
}
list(src) {
let cap = this.rules.block.list.exec(src);
if (cap) {
let raw, istask, ischecked, indent, i, blankLine, endsWithBlankLine,
line, nextLine, rawLine, itemContents, endEarly;
let bull = cap[1].trim();
const isordered = bull.length > 1;
const list = {
type: 'list',
raw: '',
ordered: isordered,
start: isordered ? +bull.slice(0, -1) : '',
loose: false,
items: []
};
bull = isordered ? `\\d{1,9}\\${bull.slice(-1)}` : `\\${bull}`;
if (this.options.pedantic) {
bull = isordered ? bull : '[*+-]';
}
// Get next list item
const itemRegex = new RegExp(`^( {0,3}${bull})((?:[\t ][^\\n]*)?(?:\\n|$))`);
// Check if current bullet point can start a new List Item
while (src) {
endEarly = false;
if (!(cap = itemRegex.exec(src))) {
break;
}
if (this.rules.block.hr.test(src)) { // End list if bullet was actually HR (possibly move into itemRegex?)
break;
}
raw = cap[0];
src = src.substring(raw.length);
line = cap[2].split('\n', 1)[0].replace(/^\t+/, (t) => ' '.repeat(3 * t.length));
nextLine = src.split('\n', 1)[0];
if (this.options.pedantic) {
indent = 2;
itemContents = line.trimLeft();
} else {
indent = cap[2].search(/[^ ]/); // Find first non-space char
indent = indent > 4 ? 1 : indent; // Treat indented code blocks (> 4 spaces) as having only 1 indent
itemContents = line.slice(indent);
indent += cap[1].length;
}
blankLine = false;
if (!line && /^ *$/.test(nextLine)) { // Items begin with at most one blank line
raw += nextLine + '\n';
src = src.substring(nextLine.length + 1);
endEarly = true;
}
if (!endEarly) {
const nextBulletRegex = new RegExp(`^ {0,${Math.min(3, indent - 1)}}(?:[*+-]|\\d{1,9}[.)])((?:[ \t][^\\n]*)?(?:\\n|$))`);
const hrRegex = new RegExp(`^ {0,${Math.min(3, indent - 1)}}((?:- *){3,}|(?:_ *){3,}|(?:\\* *){3,})(?:\\n+|$)`);
const fencesBeginRegex = new RegExp(`^ {0,${Math.min(3, indent - 1)}}(?:\`\`\`|~~~)`);
const headingBeginRegex = new RegExp(`^ {0,${Math.min(3, indent - 1)}}#`);
// Check if following lines should be included in List Item
while (src) {
rawLine = src.split('\n', 1)[0];
nextLine = rawLine;
// Re-align to follow commonmark nesting rules
if (this.options.pedantic) {
nextLine = nextLine.replace(/^ {1,4}(?=( {4})*[^ ])/g, ' ');
}
// End list item if found code fences
if (fencesBeginRegex.test(nextLine)) {
break;
}
// End list item if found start of new heading
if (headingBeginRegex.test(nextLine)) {
break;
}
// End list item if found start of new bullet
if (nextBulletRegex.test(nextLine)) {
break;
}
// Horizontal rule found
if (hrRegex.test(src)) {
break;
}
if (nextLine.search(/[^ ]/) >= indent || !nextLine.trim()) { // Dedent if possible
itemContents += '\n' + nextLine.slice(indent);
} else {
// not enough indentation
if (blankLine) {
break;
}
// paragraph continuation unless last line was a different block level element
if (line.search(/[^ ]/) >= 4) { // indented code block
break;
}
if (fencesBeginRegex.test(line)) {
break;
}
if (headingBeginRegex.test(line)) {
break;
}
if (hrRegex.test(line)) {
break;
}
itemContents += '\n' + nextLine;
}
if (!blankLine && !nextLine.trim()) { // Check if current line is blank
blankLine = true;
}
raw += rawLine + '\n';
src = src.substring(rawLine.length + 1);
line = nextLine.slice(indent);
}
}
if (!list.loose) {
// If the previous item ended with a blank line, the list is loose
if (endsWithBlankLine) {
list.loose = true;
} else if (/\n *\n *$/.test(raw)) {
endsWithBlankLine = true;
}
}
// Check for task list items
if (this.options.gfm) {
istask = /^\[[ xX]\] /.exec(itemContents);
if (istask) {
ischecked = istask[0] !== '[ ] ';
itemContents = itemContents.replace(/^\[[ xX]\] +/, '');
}
}
list.items.push({
type: 'list_item',
raw,
task: !!istask,
checked: ischecked,
loose: false,
text: itemContents
});
list.raw += raw;
}
// Do not consume newlines at end of final item. Alternatively, make itemRegex *start* with any newlines to simplify/speed up endsWithBlankLine logic
list.items[list.items.length - 1].raw = raw.trimRight();
list.items[list.items.length - 1].text = itemContents.trimRight();
list.raw = list.raw.trimRight();
const l = list.items.length;
// Item child tokens handled here at end because we needed to have the final item to trim it first
for (i = 0; i < l; i++) {
this.lexer.state.top = false;
list.items[i].tokens = this.lexer.blockTokens(list.items[i].text, []);
if (!list.loose) {
// Check if list should be loose
const spacers = list.items[i].tokens.filter(t => t.type === 'space');
const hasMultipleLineBreaks = spacers.length > 0 && spacers.some(t => /\n.*\n/.test(t.raw));
list.loose = hasMultipleLineBreaks;
}
}
// Set all items to loose if list is loose
if (list.loose) {
for (i = 0; i < l; i++) {
list.items[i].loose = true;
}
}
return list;
}
}
html(src) {
const cap = this.rules.block.html.exec(src);
if (cap) {
const token = {
type: 'html',
raw: cap[0],
pre: !this.options.sanitizer
&& (cap[1] === 'pre' || cap[1] === 'script' || cap[1] === 'style'),
text: cap[0]
};
if (this.options.sanitize) {
const text = this.options.sanitizer ? this.options.sanitizer(cap[0]) : escape(cap[0]);
token.type = 'paragraph';
token.text = text;
token.tokens = this.lexer.inline(text);
}
return token;
}
}
def(src) {
const cap = this.rules.block.def.exec(src);
if (cap) {
const tag = cap[1].toLowerCase().replace(/\s+/g, ' ');
const href = cap[2] ? cap[2].replace(/^<(.*)>$/, '$1').replace(this.rules.inline._escapes, '$1') : '';
const title = cap[3] ? cap[3].substring(1, cap[3].length - 1).replace(this.rules.inline._escapes, '$1') : cap[3];
return {
type: 'def',
tag,
raw: cap[0],
href,
title
};
}
}
table(src) {
const cap = this.rules.block.table.exec(src);
if (cap) {
const item = {
type: 'table',
header: splitCells(cap[1]).map(c => { return { text: c }; }),
align: cap[2].replace(/^ *|\| *$/g, '').split(/ *\| */),
rows: cap[3] && cap[3].trim() ? cap[3].replace(/\n[ \t]*$/, '').split('\n') : []
};
if (item.header.length === item.align.length) {
item.raw = cap[0];
let l = item.align.length;
let i, j, k, row;
for (i = 0; i < l; i++) {
if (/^ *-+: *$/.test(item.align[i])) {
item.align[i] = 'right';
} else if (/^ *:-+: *$/.test(item.align[i])) {
item.align[i] = 'center';
} else if (/^ *:-+ *$/.test(item.align[i])) {
item.align[i] = 'left';
} else {
item.align[i] = null;
}
}
l = item.rows.length;
for (i = 0; i < l; i++) {
item.rows[i] = splitCells(item.rows[i], item.header.length).map(c => { return { text: c }; });
}
// parse child tokens inside headers and cells
// header child tokens
l = item.header.length;
for (j = 0; j < l; j++) {
item.header[j].tokens = this.lexer.inline(item.header[j].text);
}
// cell child tokens
l = item.rows.length;
for (j = 0; j < l; j++) {
row = item.rows[j];
for (k = 0; k < row.length; k++) {
row[k].tokens = this.lexer.inline(row[k].text);
}
}
return item;
}
}
}
lheading(src) {
const cap = this.rules.block.lheading.exec(src);
if (cap) {
return {
type: 'heading',
raw: cap[0],
depth: cap[2].charAt(0) === '=' ? 1 : 2,
text: cap[1],
tokens: this.lexer.inline(cap[1])
};
}
}
paragraph(src) {
const cap = this.rules.block.paragraph.exec(src);
if (cap) {
const text = cap[1].charAt(cap[1].length - 1) === '\n'
? cap[1].slice(0, -1)
: cap[1];
return {
type: 'paragraph',
raw: cap[0],
text,
tokens: this.lexer.inline(text)
};
}
}
text(src) {
const cap = this.rules.block.text.exec(src);
if (cap) {
return {
type: 'text',
raw: cap[0],
text: cap[0],
tokens: this.lexer.inline(cap[0])
};
}
}
escape(src) {
const cap = this.rules.inline.escape.exec(src);
if (cap) {
return {
type: 'escape',
raw: cap[0],
text: escape(cap[1])
};
}
}
tag(src) {
const cap = this.rules.inline.tag.exec(src);
if (cap) {
if (!this.lexer.state.inLink && /^<a /i.test(cap[0])) {
this.lexer.state.inLink = true;
} else if (this.lexer.state.inLink && /^<\/a>/i.test(cap[0])) {
this.lexer.state.inLink = false;
}
if (!this.lexer.state.inRawBlock && /^<(pre|code|kbd|script)(\s|>)/i.test(cap[0])) {
this.lexer.state.inRawBlock = true;
} else if (this.lexer.state.inRawBlock && /^<\/(pre|code|kbd|script)(\s|>)/i.test(cap[0])) {
this.lexer.state.inRawBlock = false;
}
return {
type: this.options.sanitize
? 'text'
: 'html',
raw: cap[0],
inLink: this.lexer.state.inLink,
inRawBlock: this.lexer.state.inRawBlock,
text: this.options.sanitize
? (this.options.sanitizer
? this.options.sanitizer(cap[0])
: escape(cap[0]))
: cap[0]
};
}
}
link(src) {
const cap = this.rules.inline.link.exec(src);
if (cap) {
const trimmedUrl = cap[2].trim();
if (!this.options.pedantic && /^</.test(trimmedUrl)) {
// commonmark requires matching angle brackets
if (!(/>$/.test(trimmedUrl))) {
return;
}
// ending angle bracket cannot be escaped
const rtrimSlash = rtrim(trimmedUrl.slice(0, -1), '\\');
if ((trimmedUrl.length - rtrimSlash.length) % 2 === 0) {
return;
}
} else {
// find closing parenthesis
const lastParenIndex = findClosingBracket(cap[2], '()');
if (lastParenIndex > -1) {
const start = cap[0].indexOf('!') === 0 ? 5 : 4;
const linkLen = start + cap[1].length + lastParenIndex;
cap[2] = cap[2].substring(0, lastParenIndex);
cap[0] = cap[0].substring(0, linkLen).trim();
cap[3] = '';
}
}
let href = cap[2];
let title = '';
if (this.options.pedantic) {
// split pedantic href and title
const link = /^([^'"]*[^\s])\s+(['"])(.*)\2/.exec(href);
if (link) {
href = link[1];
title = link[3];
}
} else {
title = cap[3] ? cap[3].slice(1, -1) : '';
}
href = href.trim();
if (/^</.test(href)) {
if (this.options.pedantic && !(/>$/.test(trimmedUrl))) {
// pedantic allows starting angle bracket without ending angle bracket
href = href.slice(1);
} else {
href = href.slice(1, -1);
}
}
return outputLink(cap, {
href: href ? href.replace(this.rules.inline._escapes, '$1') : href,
title: title ? title.replace(this.rules.inline._escapes, '$1') : title
}, cap[0], this.lexer);
}
}
reflink(src, links) {
let cap;
if ((cap = this.rules.inline.reflink.exec(src))
|| (cap = this.rules.inline.nolink.exec(src))) {
let link = (cap[2] || cap[1]).replace(/\s+/g, ' ');
link = links[link.toLowerCase()];
if (!link) {
const text = cap[0].charAt(0);
return {
type: 'text',
raw: text,
text
};
}
return outputLink(cap, link, cap[0], this.lexer);
}
}
emStrong(src, maskedSrc, prevChar = '') {
let match = this.rules.inline.emStrong.lDelim.exec(src);
if (!match) return;
// _ can't be between two alphanumerics. \p{L}\p{N} includes non-english alphabet/numbers as well
if (match[3] && prevChar.match(/[\p{L}\p{N}]/u)) return;
const nextChar = match[1] || match[2] || '';
if (!nextChar || (nextChar && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar)))) {
const lLength = match[0].length - 1;
let rDelim, rLength, delimTotal = lLength, midDelimTotal = 0;
const endReg = match[0][0] === '*' ? this.rules.inline.emStrong.rDelimAst : this.rules.inline.emStrong.rDelimUnd;
endReg.lastIndex = 0;
// Clip maskedSrc to same section of string as src (move to lexer?)
maskedSrc = maskedSrc.slice(-1 * src.length + lLength);
while ((match = endReg.exec(maskedSrc)) != null) {
rDelim = match[1] || match[2] || match[3] || match[4] || match[5] || match[6];
if (!rDelim) continue; // skip single * in __abc*abc__
rLength = rDelim.length;
if (match[3] || match[4]) { // found another Left Delim
delimTotal += rLength;
continue;
} else if (match[5] || match[6]) { // either Left or Right Delim
if (lLength % 3 && !((lLength + rLength) % 3)) {
midDelimTotal += rLength;
continue; // CommonMark Emphasis Rules 9-10
}
}
delimTotal -= rLength;
if (delimTotal > 0) continue; // Haven't found enough closing delimiters
// Remove extra characters. *a*** -> *a*
rLength = Math.min(rLength, rLength + delimTotal + midDelimTotal);
const raw = src.slice(0, lLength + match.index + (match[0].length - rDelim.length) + rLength);
// Create `em` if smallest delimiter has odd char count. *a***
if (Math.min(lLength, rLength) % 2) {
const text = raw.slice(1, -1);
return {
type: 'em',
raw,
text,
tokens: this.lexer.inlineTokens(text)
};
}
// Create 'strong' if smallest delimiter has even char count. **a***
const text = raw.slice(2, -2);
return {
type: 'strong',
raw,
text,
tokens: this.lexer.inlineTokens(text)
};
}
}
}
codespan(src) {
const cap = this.rules.inline.code.exec(src);
if (cap) {
let text = cap[2].replace(/\n/g, ' ');
const hasNonSpaceChars = /[^ ]/.test(text);
const hasSpaceCharsOnBothEnds = /^ /.test(text) && / $/.test(text);
if (hasNonSpaceChars && hasSpaceCharsOnBothEnds) {
text = text.substring(1, text.length - 1);
}
text = escape(text, true);
return {
type: 'codespan',
raw: cap[0],
text
};
}
}
br(src) {
const cap = this.rules.inline.br.exec(src);
if (cap) {
return {
type: 'br',
raw: cap[0]
};
}
}
del(src) {
const cap = this.rules.inline.del.exec(src);
if (cap) {
return {
type: 'del',
raw: cap[0],
text: cap[2],
tokens: this.lexer.inlineTokens(cap[2])
};
}
}
autolink(src, mangle) {
const cap = this.rules.inline.autolink.exec(src);
if (cap) {
let text, href;
if (cap[2] === '@') {
text = escape(this.options.mangle ? mangle(cap[1]) : cap[1]);
href = 'mailto:' + text;
} else {
text = escape(cap[1]);
href = text;
}
return {
type: 'link',
raw: cap[0],
text,
href,
tokens: [
{
type: 'text',
raw: text,
text
}
]
};
}
}
url(src, mangle) {
let cap;
if (cap = this.rules.inline.url.exec(src)) {
let text, href;
if (cap[2] === '@') {
text = escape(this.options.mangle ? mangle(cap[0]) : cap[0]);
href = 'mailto:' + text;
} else {
// do extended autolink path validation
let prevCapZero;
do {
prevCapZero = cap[0];
cap[0] = this.rules.inline._backpedal.exec(cap[0])[0];
} while (prevCapZero !== cap[0]);
text = escape(cap[0]);
if (cap[1] === 'www.') {
href = 'http://' + cap[0];
} else {
href = cap[0];
}
}
return {
type: 'link',
raw: cap[0],
text,
href,
tokens: [
{
type: 'text',
raw: text,
text
}
]
};
}
}
inlineText(src, smartypants) {
const cap = this.rules.inline.text.exec(src);
if (cap) {
let text;
if (this.lexer.state.inRawBlock) {
text = this.options.sanitize ? (this.options.sanitizer ? this.options.sanitizer(cap[0]) : escape(cap[0])) : cap[0];
} else {
text = escape(this.options.smartypants ? smartypants(cap[0]) : cap[0]);
}
return {
type: 'text',
raw: cap[0],
text
};
}
}
}