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index.js
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/* @jsx h */
/**
* markdown-to-jsx@6 is a fork of [simple-markdown v0.2.2](https://github.com/Khan/simple-markdown)
* from Khan Academy. Thank you Khan devs for making such an awesome and extensible
* parsing infra... without it, half of the optimizations here wouldn't be feasible. 🙏🏼
*/
import React from 'react';
import unquote from 'unquote';
/** TODO: Drop for React 16? */
const ATTRIBUTE_TO_JSX_PROP_MAP = {
accesskey: 'accessKey',
allowfullscreen: 'allowFullScreen',
allowtransparency: 'allowTransparency',
autocomplete: 'autoComplete',
autofocus: 'autoFocus',
autoplay: 'autoPlay',
cellpadding: 'cellPadding',
cellspacing: 'cellSpacing',
charset: 'charSet',
class: 'className',
classid: 'classId',
colspan: 'colSpan',
contenteditable: 'contentEditable',
contextmenu: 'contextMenu',
crossorigin: 'crossOrigin',
enctype: 'encType',
for: 'htmlFor',
formaction: 'formAction',
formenctype: 'formEncType',
formmethod: 'formMethod',
formnovalidate: 'formNoValidate',
formtarget: 'formTarget',
frameborder: 'frameBorder',
hreflang: 'hrefLang',
inputmode: 'inputMode',
keyparams: 'keyParams',
keytype: 'keyType',
marginheight: 'marginHeight',
marginwidth: 'marginWidth',
maxlength: 'maxLength',
mediagroup: 'mediaGroup',
minlength: 'minLength',
novalidate: 'noValidate',
radiogroup: 'radioGroup',
readonly: 'readOnly',
rowspan: 'rowSpan',
spellcheck: 'spellCheck',
srcdoc: 'srcDoc',
srclang: 'srcLang',
srcset: 'srcSet',
tabindex: 'tabIndex',
usemap: 'useMap',
};
const DO_NOT_PROCESS_HTML_ELEMENTS = ['style', 'script'];
/**
* the attribute extractor regex looks for a valid attribute name,
* followed by an equal sign (whitespace around the equal sign is allowed), followed
* by one of the following:
*
* 1. a single quote-bounded string, e.g. 'foo'
* 2. a double quote-bounded string, e.g. "bar"
* 3. an interpolation, e.g. {something}
*
* JSX can be be interpolated into itself and is passed through the compiler using
* the same options and setup as the current run.
*
* <Something children={<SomeOtherThing />} />
* ==================
* ↳ children: [<SomeOtherThing />]
*
* Otherwise, interpolations are handled as strings or simple booleans
* unless HTML syntax is detected.
*
* <Something color={green} disabled={true} />
* ===== ====
* ↓ ↳ disabled: true
* ↳ color: "green"
*
* Numbers are not parsed at this time due to complexities around int, float,
* and the upcoming bigint functionality that would make handling it unwieldy.
* Parse the string in your component as desired.
*
* <Something someBigNumber={123456789123456789} />
* ==================
* ↳ someBigNumber: "123456789123456789"
*/
const ATTR_EXTRACTOR_R = /([-A-Z0-9_:]+)(?:\s*=\s*(?:(?:"((?:\\.|[^"])*)")|(?:'((?:\\.|[^'])*)')|(?:\{((?:\\.|{[^}]*?}|[^}])*)\})))?/gi;
/** TODO: Write explainers for each of these */
const AUTOLINK_MAILTO_CHECK_R = /mailto:/i;
const BLOCK_END_R = /\n{2,}$/;
const BLOCKQUOTE_R = /^( *>[^\n]+(\n[^\n]+)*\n*)+\n{2,}/;
const BLOCKQUOTE_TRIM_LEFT_MULTILINE_R = /^ *> ?/gm;
const BREAK_LINE_R = /^ {2,}\n/;
const BREAK_THEMATIC_R = /^(?:( *[-*_]) *){3,}(?:\n *)+\n/;
const CODE_BLOCK_FENCED_R = /^\s*(`{3,}|~{3,}) *(\S+)? *\n([\s\S]+?)\s*\1 *(?:\n *)+\n/;
const CODE_BLOCK_R = /^(?: {4}[^\n]+\n*)+(?:\n *)+\n/;
const CODE_INLINE_R = /^(`+)\s*([\s\S]*?[^`])\s*\1(?!`)/;
const CONSECUTIVE_NEWLINE_R = /^(?:\n *)*\n/;
const CR_NEWLINE_R = /\r\n?/g;
const DETECT_BLOCK_SYNTAX = /(^[-*] |^#+ ?\w|^ {2,}|^-{2,}|^> |^`{3})/m;
const FOOTNOTE_R = /^\[\^(.*)\](:.*)\n/;
const FOOTNOTE_REFERENCE_R = /^\[\^(.*)\]/;
const FORMFEED_R = /\f/g;
const GFM_TASK_R = /^\s*?\[(x|\s)\]/;
const HEADING_R = /^ *(#{1,6}) *([^\n]+?) *#* *\n+/;
const HEADING_SETEXT_R = /^([^\n]+)\n *(=|-){3,} *(?:\n *)+\n/;
/**
* Explanation:
*
* 1. Look for a starting tag, preceeded by any amount of spaces
* ^ *<
*
* 2. Capture the tag name (capture 1)
* ([^ >/]+)
*
* 3. Ignore a space after the starting tag and capture the attribute portion of the tag (capture 2)
* ?([^>]*)\/{0}>
*
* 4. Ensure a matching closing tag is present in the rest of the input string
* (?=[\s\S]*<\/\1>)
*
* 5. Capture everything until the matching closing tag -- this might include additional pairs
* of the same tag type found in step 2 (capture 3)
* ((?:[\s\S]*?(?:<\1[^>]*>[\s\S]*?<\/\1>)*[\s\S]*?)*?)<\/\1>
*
* 6. Capture excess newlines afterward
* \n*
*/
const HTML_BLOCK_ELEMENT_R = /^ *<([A-Za-z][^ >/]*) ?([^>]*)\/{0}>\s*((?:<\1[^>]*?>[\s\S]*?<\/\1>|(?!<\1)[\s\S])*?)<\/\1>\n*/;
const HTML_COMMENT_R = /^<!--.*?-->/;
/**
* borrowed from React 15(https://github.com/facebook/react/blob/894d20744cba99383ffd847dbd5b6e0800355a5c/src/renderers/dom/shared/HTMLDOMPropertyConfig.js)
*/
const HTML_CUSTOM_ATTR_R = /^(data|aria|x)-[a-z_][a-z\d_.-]*$/;
const HTML_SELF_CLOSING_ELEMENT_R = /^ *<([A-Za-z][\w:]*)\s*((?:<.*?>|[^>])*)>(?!<\/\1>)\s*/;
const INTERPOLATION_R = /^\{.*\}$/;
const LINK_AUTOLINK_BARE_URL_R = /^(https?:\/\/[^\s<]+[^<.,:;"')\]\s])/;
const LINK_AUTOLINK_MAILTO_R = /^<([^ >]+@[^ >]+)>/;
const LINK_AUTOLINK_R = /^<([^ >]+:\/[^ >]+)>/;
const LIST_ITEM_END_R = / *\n+$/;
const LIST_LOOKBEHIND_R = /(?:^|\n)( *)$/;
const CAPTURE_LETTER_AFTER_HYPHEN = /-([a-z])?/gi;
const NP_TABLE_R = /^(.*\|?.*)\n *(\|? *[-:]+ *\|[-| :]*)\n((?:.*\|.*\n)*)\n?/;
const PARAGRAPH_R = /^((?:[^\n]|\n(?! *\n))+)(?:\n *)+\n/;
const REFERENCE_IMAGE_OR_LINK = /^\[([^\]]*)\]:\s*(\S+)\s*("([^"]*)")?/;
const REFERENCE_IMAGE_R = /^!\[([^\]]*)\] ?\[([^\]]*)\]/;
const REFERENCE_LINK_R = /^\[([^\]]*)\] ?\[([^\]]*)\]/;
const SHOULD_RENDER_AS_BLOCK_R = /(\n|^[-*]\s|^#|^ {2,}|^-{2,}|^>\s)/;
const TAB_R = /\t/g;
const TABLE_TRIM_PIPES = /(^ *\||\| *$)/g;
const TABLE_CENTER_ALIGN = /^ *:-+: *$/;
const TABLE_LEFT_ALIGN = /^ *:-+ *$/;
const TABLE_RIGHT_ALIGN = /^ *-+: *$/;
const TABLE_ROW_SPLIT = / *\| */;
/**
* (delimiter regex)((?:.*?([`~]).*?\3.*?)*|(?:.*?[\[(<].*?[\])>].*?)*|.+?)
*
* detects other inline syntaxes and ignores them; this helps alleviate issues like
* **Foo `**` baz**
*
* Where the ** inside the backticks would be detected as the end of the bolding.
*/
/**
* Bolding requires the same character to be used twice, so we do a detect for which
* one is in use, then double-check it's used a second time and then twice at the end.
*
* Bits of the mega regex:
*
* |[^`~()\[\]<>]*? ignore normal stuff
* |(?:.*?([`~]).*?\3.*?)* ignore stuff in backticks & tildes
* |(?:.*?\([^)]*?\).*?)* ignore stuff in parens
* |(?:.*?\[[^\]]*?\].*?)* ignore stuff in square brackets
* |(?:.*?<.*?>.*?)* ignore stuff in angle brackets
*
*/
const TEXT_BOLD_R = /^([*_])\1((?:[^`~()\[\]<>]*?|(?:.*?([`~]).*?\3.*?)*|(?:.*?\([^)]*?\).*?)*|(?:.*?\[[^\]]*?\].*?)*|(?:.*?<.*?>.*?)*|[^\1]*?)\1?)\1{2}/;
const TEXT_EMPHASIZED_R = /^([*_])((?:[^`~()\[\]<>]*?|(?:.*?([`~]).*?\3.*?)*|(?:.*?\([^)]*?\).*?)*|(?:.*?\[[^\]]*?\].*?)*|(?:.*?<.*?>.*?)*|[^\1]*?))\1/;
const TEXT_STRIKETHROUGHED_R = /^~~((?:.*?([`~]).*?\2.*?)*|(?:.*?<.*?>.*?)*|.+?)~~/;
const TEXT_ESCAPED_R = /^\\([^0-9A-Za-z\s])/;
const TEXT_PLAIN_R = /^[\s\S]+?(?=[^0-9A-Z\s\u00c0-\uffff]|\d+\.|\n\n| {2,}\n|\w+:\S|$)/i;
const TRIM_NEWLINES_AND_TRAILING_WHITESPACE_R = /(^\n+|(\n|\s)+$)/g;
/**
* Indentation-significant syntaxes cannot be used inside arbitrary HTML at this time because
* it's not clear if the indentation is intentional or just there from how the composer
* laid things out.
*
* For code blocks, use fenced blocks instead (```).
*
* There's more detail on this in the README.
*/
const TRIM_HTML = /^[ \t]*|[ \t]*$/gm;
const UNESCAPE_URL_R = /\\([^0-9A-Z\s])/gi;
// recognize a `*` `-`, `+`, `1.`, `2.`... list bullet
const LIST_BULLET = '(?:[*+-]|\\d+\\.)';
// recognize the start of a list item:
// leading space plus a bullet plus a space (` * `)
const LIST_ITEM_PREFIX = '( *)(' + LIST_BULLET + ') +';
const LIST_ITEM_PREFIX_R = new RegExp('^' + LIST_ITEM_PREFIX);
// recognize an individual list item:
// * hi
// this is part of the same item
//
// as is this, which is a new paragraph in the same item
//
// * but this is not part of the same item
const LIST_ITEM_R = new RegExp(
LIST_ITEM_PREFIX +
'[^\\n]*(?:\\n' +
'(?!\\1' +
LIST_BULLET +
' )[^\\n]*)*(\\n|$)',
'gm'
);
// check whether a list item has paragraphs: if it does,
// we leave the newlines at the end
const LIST_R = new RegExp(
'^( *)(' +
LIST_BULLET +
') ' +
'[\\s\\S]+?(?:\\n{2,}(?! )' +
'(?!\\1' +
LIST_BULLET +
' )\\n*' +
// the \\s*$ here is so that we can parse the inside of nested
// lists, where our content might end before we receive two `\n`s
'|\\s*\\n*$)'
);
const LINK_INSIDE = '(?:\\[[^\\]]*\\]|[^\\[\\]]|\\](?=[^\\[]*\\]))*';
const LINK_HREF_AND_TITLE =
'\\s*<?((?:[^\\s\\\\]|\\\\.)*?)>?(?:\\s+[\'"]([\\s\\S]*?)[\'"])?\\s*';
const LINK_R = new RegExp(
'^\\[(' + LINK_INSIDE + ')\\]\\(' + LINK_HREF_AND_TITLE + '\\)'
);
const IMAGE_R = new RegExp(
'^!\\[(' + LINK_INSIDE + ')\\]\\(' + LINK_HREF_AND_TITLE + '\\)'
);
// based on https://stackoverflow.com/a/18123682/1141611
// not complete, but probably good enough
function slugify(str) {
return str
.replace(/[ÀÁÂÃÄÅàáâãäåæÆ]/g, 'a')
.replace(/[çÇ]/g, 'c')
.replace(/[ðÐ]/g, 'd')
.replace(/[ÈÉÊËéèêë]/g, 'e')
.replace(/[ÏïÎîÍíÌì]/g, 'i')
.replace(/[Ññ]/g, 'n')
.replace(/[øØœŒÕõÔôÓóÒò]/g, 'o')
.replace(/[ÜüÛûÚúÙù]/g, 'u')
.replace(/[ŸÿÝý]/g, 'y')
.replace(/[^a-z0-9- ]/gi, '')
.replace(/ /gi, '-')
.toLowerCase();
}
function parseTableAlignCapture(alignCapture) {
if (TABLE_RIGHT_ALIGN.test(alignCapture)) {
return 'right';
} else if (TABLE_CENTER_ALIGN.test(alignCapture)) {
return 'center';
} else if (TABLE_LEFT_ALIGN.test(alignCapture)) {
return 'left';
}
return null;
}
function parseTableHeader(capture, parse, state) {
const headerText = capture[1]
.replace(TABLE_TRIM_PIPES, '')
.trim()
.split(TABLE_ROW_SPLIT);
return headerText.map(function(text) {
return parse(text, state);
});
}
function parseTableAlign(capture /*, parse, state*/) {
const alignText = capture[2]
.replace(TABLE_TRIM_PIPES, '')
.trim()
.split(TABLE_ROW_SPLIT);
return alignText.map(parseTableAlignCapture);
}
function parseTableCells(capture, parse, state) {
const rowsText = capture[3]
.replace(TABLE_TRIM_PIPES, '')
.trim()
.split('\n');
return rowsText.map(function(rowText) {
return rowText
.replace(TABLE_TRIM_PIPES, '')
.split(TABLE_ROW_SPLIT)
.map(function(text) {
return parse(text.trim(), state);
});
});
}
function parseTable(capture, parse, state) {
state.inline = true;
const header = parseTableHeader(capture, parse, state);
const align = parseTableAlign(capture, parse, state);
const cells = parseTableCells(capture, parse, state);
state.inline = false;
return {
align: align,
cells: cells,
header: header,
type: 'table',
};
}
function getTableStyle(node, colIndex) {
return node.align[colIndex] == null
? {}
: {
textAlign: node.align[colIndex],
};
}
/** TODO: remove for react 16 */
function normalizeAttributeKey(key) {
const hyphenIndex = key.indexOf('-');
if (hyphenIndex !== -1 && key.match(HTML_CUSTOM_ATTR_R) === null) {
key = key.replace(CAPTURE_LETTER_AFTER_HYPHEN, function(_, letter) {
return letter.toUpperCase();
});
}
return key;
}
function isInterpolation(value) {
return INTERPOLATION_R.test(value);
}
function attributeValueToJSXPropValue(key, value) {
if (key === 'style') {
return value.split(/;\s?/).reduce(function(styles, kvPair) {
const key = kvPair.slice(0, kvPair.indexOf(':'));
// snake-case to camelCase
// also handles PascalCasing vendor prefixes
const camelCasedKey = key.replace(/(-[a-z])/g, function toUpper(
substr
) {
return substr[1].toUpperCase();
});
// key.length + 1 to skip over the colon
styles[camelCasedKey] = kvPair.slice(key.length + 1).trim();
return styles;
}, {});
} else if (isInterpolation(value)) {
// return as a string and let the consumer decide what to do with it
value = value.slice(1, value.length - 1);
}
if (value === 'true') {
return true;
} else if (value === 'false') {
return false;
}
return value;
}
function normalizeWhitespace(source) {
return source
.replace(CR_NEWLINE_R, '\n')
.replace(FORMFEED_R, '')
.replace(TAB_R, ' ');
}
/**
* Creates a parser for a given set of rules, with the precedence
* specified as a list of rules.
*
* @rules: an object containing
* rule type -> {match, order, parse} objects
* (lower order is higher precedence)
* (Note: `order` is added to defaultRules after creation so that
* the `order` of defaultRules in the source matches the `order`
* of defaultRules in terms of `order` fields.)
*
* @returns The resulting parse function, with the following parameters:
* @source: the input source string to be parsed
* @state: an optional object to be threaded through parse
* calls. Allows clients to add stateful operations to
* parsing, such as keeping track of how many levels deep
* some nesting is. For an example use-case, see passage-ref
* parsing in src/widgets/passage/passage-markdown.jsx
*/
function parserFor(rules) {
// Sorts rules in order of increasing order, then
// ascending rule name in case of ties.
let ruleList = Object.keys(rules);
/* istanbul ignore next */
if (process.env.NODE_ENV !== 'production') {
ruleList.forEach(function(type) {
let order = rules[type].order;
if (
process.env.NODE_ENV !== 'production' &&
(typeof order !== 'number' || !isFinite(order)) &&
typeof console !== 'undefined'
) {
console.warn(
'markdown-to-jsx: Invalid order for rule `' +
type +
'`: ' +
order
);
}
});
}
ruleList.sort(function(typeA, typeB) {
let orderA = rules[typeA].order;
let orderB = rules[typeB].order;
// First sort based on increasing order
if (orderA !== orderB) {
return orderA - orderB;
// Then based on increasing unicode lexicographic ordering
} else if (typeA < typeB) {
return -1;
}
return 1;
});
function nestedParse(source, state) {
let result = [];
// We store the previous capture so that match functions can
// use some limited amount of lookbehind. Lists use this to
// ensure they don't match arbitrary '- ' or '* ' in inline
// text (see the list rule for more information).
let prevCapture = '';
while (source) {
let i = 0;
while (i < ruleList.length) {
const ruleType = ruleList[i];
const rule = rules[ruleType];
const capture = rule.match(source, state, prevCapture);
if (capture) {
const currCaptureString = capture[0];
source = source.substring(currCaptureString.length);
const parsed = rule.parse(capture, nestedParse, state);
// We also let rules override the default type of
// their parsed node if they would like to, so that
// there can be a single output function for all links,
// even if there are several rules to parse them.
if (parsed.type == null) {
parsed.type = ruleType;
}
result.push(parsed);
prevCapture = currCaptureString;
break;
}
i++;
}
}
return result;
}
return function outerParse(source, state) {
return nestedParse(normalizeWhitespace(source), state);
};
}
// Creates a match function for an inline scoped or simple element from a regex
function inlineRegex(regex) {
return function match(source, state) {
if (state.inline) {
return regex.exec(source);
} else {
return null;
}
};
}
// basically any inline element except links
function simpleInlineRegex(regex) {
return function match(source, state) {
if (state.inline || state.simple) {
return regex.exec(source);
} else {
return null;
}
};
}
// Creates a match function for a block scoped element from a regex
function blockRegex(regex) {
return function match(source, state) {
if (state.inline || state.simple) {
return null;
} else {
return regex.exec(source);
}
};
}
// Creates a match function from a regex, ignoring block/inline scope
function anyScopeRegex(regex) {
return function match(source /*, state*/) {
return regex.exec(source);
};
}
function reactFor(outputFunc) {
return function nestedReactOutput(ast, state) {
state = state || {};
if (Array.isArray(ast)) {
const oldKey = state.key;
const result = [];
// map nestedOutput over the ast, except group any text
// nodes together into a single string output.
let lastWasString = false;
for (let i = 0; i < ast.length; i++) {
state.key = i;
const nodeOut = nestedReactOutput(ast[i], state);
const isString = typeof nodeOut === 'string';
if (isString && lastWasString) {
result[result.length - 1] += nodeOut;
} else {
result.push(nodeOut);
}
lastWasString = isString;
}
state.key = oldKey;
return result;
}
return outputFunc(ast, nestedReactOutput, state);
};
}
function sanitizeUrl(url) {
try {
const prot = decodeURIComponent(url)
.replace(/[^A-Z0-9/:]/gi, '')
.toLowerCase();
if (prot.indexOf('javascript:') === 0) {
return null;
}
} catch (e) {
// decodeURIComponent sometimes throws a URIError
// See `decodeURIComponent('a%AFc');`
// http://stackoverflow.com/questions/9064536/javascript-decodeuricomponent-malformed-uri-exception
return null;
}
return url;
}
function unescapeUrl(rawUrlString) {
return rawUrlString.replace(UNESCAPE_URL_R, '$1');
}
/**
* Everything inline, including links.
*/
function parseInline(parse, content, state) {
const isCurrentlyInline = state.inline || false;
const isCurrentlySimple = state.simple || false;
state.inline = true;
state.simple = true;
const result = parse(content, state);
state.inline = isCurrentlyInline;
state.simple = isCurrentlySimple;
return result;
}
/**
* Anything inline that isn't a link.
*/
function parseSimpleInline(parse, content, state) {
const isCurrentlyInline = state.inline || false;
const isCurrentlySimple = state.simple || false;
state.inline = false;
state.simple = true;
const result = parse(content, state);
state.inline = isCurrentlyInline;
state.simple = isCurrentlySimple;
return result;
}
function parseBlock(parse, content, state) {
state.inline = false;
return parse(content + '\n\n', state);
}
function parseCaptureInline(capture, parse, state) {
return {
content: parseInline(parse, capture[1], state),
};
}
function captureNothing() {
return {};
}
function renderNothing() {
return null;
}
function ruleOutput(rules) {
return function nestedRuleOutput(ast, outputFunc, state) {
return rules[ast.type].react(ast, outputFunc, state);
};
}
function cx() {
return Array.prototype.slice
.call(arguments)
.filter(Boolean)
.join(' ');
}
function get(src, path, fb) {
let ptr = src;
const frags = path.split('.');
while (frags.length) {
ptr = ptr[frags[0]];
if (ptr === undefined) break;
else frags.shift();
}
return ptr || fb;
}
function getTag(tag, overrides) {
const override = get(overrides, tag);
return typeof override === 'function'
? override
: get(overrides, `${tag}.component`, tag);
}
/**
* anything that must scan the tree before everything else
*/
const PARSE_PRIORITY_MAX = 1;
/**
* scans for block-level constructs
*/
const PARSE_PRIORITY_HIGH = 2;
/**
* inline w/ more priority than other inline
*/
const PARSE_PRIORITY_MED = 3;
/**
* inline elements
*/
const PARSE_PRIORITY_LOW = 4;
/**
* bare text and stuff that is considered leftovers
*/
const PARSE_PRIORITY_MIN = 5;
export function compiler(markdown, options) {
options = options || {};
options.overrides = options.overrides || {};
const createElementFn = options.createElement || React.createElement;
// eslint-disable-next-line no-unused-vars
function h(tag, props, ...children) {
const overrideProps = get(options.overrides, `${tag}.props`, {});
return createElementFn(
getTag(tag, options.overrides),
{
...overrideProps,
...props,
className:
cx(props && props.className, overrideProps.className) ||
undefined,
},
...children
);
}
function compile(input) {
let inline = false;
if (options.forceInline) {
inline = true;
} else if (!options.forceBlock) {
/**
* should not contain any block-level markdown like newlines, lists, headings,
* thematic breaks, blockquotes, tables, etc
*/
inline = SHOULD_RENDER_AS_BLOCK_R.test(input) === false;
}
const arr = emitter(
parser(
inline
? input
: `${input.replace(
TRIM_NEWLINES_AND_TRAILING_WHITESPACE_R,
''
)}\n\n`,
{ inline }
)
);
let jsx;
if (arr.length > 1) {
jsx = inline ? <span>{arr}</span> : <div>{arr}</div>;
} else if (arr.length === 1) {
jsx = arr[0];
// TODO: remove this for React 16
if (typeof jsx === 'string') {
jsx = <span>{jsx}</span>;
}
} else {
// TODO: return null for React 16
jsx = <span />;
}
return jsx;
}
function attrStringToMap(str) {
const attributes = str.match(ATTR_EXTRACTOR_R);
return attributes
? attributes.reduce(function(map, raw, index) {
const delimiterIdx = raw.indexOf('=');
if (delimiterIdx !== -1) {
const key = normalizeAttributeKey(
raw.slice(0, delimiterIdx)
).trim();
const value = unquote(raw.slice(delimiterIdx + 1).trim());
const mappedKey = ATTRIBUTE_TO_JSX_PROP_MAP[key] || key;
const normalizedValue = (map[
mappedKey
] = attributeValueToJSXPropValue(key, value));
if (
HTML_BLOCK_ELEMENT_R.test(normalizedValue) ||
HTML_SELF_CLOSING_ELEMENT_R.test(normalizedValue)
) {
map[mappedKey] = React.cloneElement(
compile(normalizedValue.trim()),
{ key: index }
);
}
} else {
map[ATTRIBUTE_TO_JSX_PROP_MAP[raw] || raw] = true;
}
return map;
}, {})
: undefined;
}
/* istanbul ignore next */
if (process.env.NODE_ENV !== 'production') {
if (typeof markdown !== 'string') {
throw new Error(`markdown-to-jsx: the first argument must be
a string`);
}
if (
Object.prototype.toString.call(options.overrides) !==
'[object Object]'
) {
throw new Error(`markdown-to-jsx: options.overrides (second argument property) must be
undefined or an object literal with shape:
{
htmltagname: {
component: string|ReactComponent(optional),
props: object(optional)
}
}`);
}
}
const footnotes = [];
const refs = {};
/**
* each rule's react() output function goes through our custom h() JSX pragma;
* this allows the override functionality to be automatically applied
*/
const rules = {
blockQuote: {
match: blockRegex(BLOCKQUOTE_R),
order: PARSE_PRIORITY_HIGH,
parse(capture, parse, state) {
return {
content: parse(
capture[0].replace(
BLOCKQUOTE_TRIM_LEFT_MULTILINE_R,
''
),
state
),
};
},
react(node, output, state) {
return (
<blockquote key={state.key}>
{output(node.content, state)}
</blockquote>
);
},
},
breakLine: {
match: anyScopeRegex(BREAK_LINE_R),
order: PARSE_PRIORITY_HIGH,
parse: captureNothing,
react(_, __, state) {
return <br key={state.key} />;
},
},
breakThematic: {
match: blockRegex(BREAK_THEMATIC_R),
order: PARSE_PRIORITY_HIGH,
parse: captureNothing,
react(_, __, state) {
return <hr key={state.key} />;
},
},
codeBlock: {
match: blockRegex(CODE_BLOCK_R),
order: PARSE_PRIORITY_MAX,
parse(capture /*, parse, state*/) {
let content = capture[0]
.replace(/^ {4}/gm, '')
.replace(/\n+$/, '');
return {
content: content,
lang: undefined,
};
},
react(node, output, state) {
return (
<pre key={state.key}>
<code className={node.lang ? `lang-${node.lang}` : ''}>
{node.content}
</code>
</pre>
);
},
},
codeFenced: {
match: blockRegex(CODE_BLOCK_FENCED_R),
order: PARSE_PRIORITY_MAX,
parse(capture /*, parse, state*/) {
return {
content: capture[3],
lang: capture[2] || undefined,
type: 'codeBlock',
};
},
},
codeInline: {
match: simpleInlineRegex(CODE_INLINE_R),
order: PARSE_PRIORITY_LOW,
parse(capture /*, parse, state*/) {
return {
content: capture[2],
};
},
react(node, output, state) {
return <code key={state.key}>{node.content}</code>;
},
},
/**
* footnotes are emitted at the end of compilation in a special <footer> block
*/
footnote: {
match: blockRegex(FOOTNOTE_R),
order: PARSE_PRIORITY_MAX,
parse(capture /*, parse, state*/) {
footnotes.push({
footnote: capture[2],
identifier: capture[1],
});
return {};
},
react: renderNothing,
},
footnoteReference: {
match: inlineRegex(FOOTNOTE_REFERENCE_R),
order: PARSE_PRIORITY_HIGH,
parse(capture /*, parse*/) {
return {
content: capture[1],
target: `#${capture[1]}`,
};
},
react(node, output, state) {
return (
<a key={state.key} href={sanitizeUrl(node.target)}>
<sup key={state.key}>{node.content}</sup>
</a>
);
},
},
gfmTask: {
match: inlineRegex(GFM_TASK_R),
order: PARSE_PRIORITY_HIGH,
parse(capture /*, parse, state*/) {
return {
completed: capture[1].toLowerCase() === 'x',
};
},
react(node, output, state) {
return (
<input
checked={node.completed}
key={state.key}
readOnly
type="checkbox"
/>
);
},
},
heading: {
match: blockRegex(HEADING_R),
order: PARSE_PRIORITY_HIGH,
parse(capture, parse, state) {
return {
content: parseInline(parse, capture[2], state),
id: slugify(capture[2]),
level: capture[1].length,
};
},
react(node, output, state) {
const Tag = `h${node.level}`;