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index.tsx
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index.tsx
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/* @jsx h */
/**
* markdown-to-jsx 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 * as React from 'react'
/**
* Analogous to `node.type`. Please note that the values here may change at any time,
* so do not hard code against the value directly.
*/
export const enum RuleType {
blockQuote = '0',
breakLine = '1',
breakThematic = '2',
codeBlock = '3',
codeFenced = '4',
codeInline = '5',
footnote = '6',
footnoteReference = '7',
gfmTask = '8',
heading = '9',
headingSetext = '10',
/** only available if not `disableHTMLParsing` */
htmlBlock = '11',
htmlComment = '12',
/** only available if not `disableHTMLParsing` */
htmlSelfClosing = '13',
image = '14',
link = '15',
/** emits a `link` 'node', does not render directly */
linkAngleBraceStyleDetector = '16',
/** emits a `link` 'node', does not render directly */
linkBareUrlDetector = '17',
/** emits a `link` 'node', does not render directly */
linkMailtoDetector = '18',
newlineCoalescer = '19',
orderedList = '20',
paragraph = '21',
ref = '22',
refImage = '23',
refLink = '24',
table = '25',
tableSeparator = '26',
text = '27',
textBolded = '28',
textEmphasized = '29',
textEscaped = '30',
textMarked = '31',
textStrikethroughed = '32',
unorderedList = '33',
}
const enum Priority {
/**
* anything that must scan the tree before everything else
*/
MAX,
/**
* scans for block-level constructs
*/
HIGH,
/**
* inline w/ more priority than other inline
*/
MED,
/**
* inline elements
*/
LOW,
/**
* bare text and stuff that is considered leftovers
*/
MIN,
}
/** TODO: Drop for React 16? */
const ATTRIBUTE_TO_JSX_PROP_MAP = [
'allowFullScreen',
'allowTransparency',
'autoComplete',
'autoFocus',
'autoPlay',
'cellPadding',
'cellSpacing',
'charSet',
'className',
'classId',
'colSpan',
'contentEditable',
'contextMenu',
'crossOrigin',
'encType',
'formAction',
'formEncType',
'formMethod',
'formNoValidate',
'formTarget',
'frameBorder',
'hrefLang',
'inputMode',
'keyParams',
'keyType',
'marginHeight',
'marginWidth',
'maxLength',
'mediaGroup',
'minLength',
'noValidate',
'radioGroup',
'readOnly',
'rowSpan',
'spellCheck',
'srcDoc',
'srcLang',
'srcSet',
'tabIndex',
'useMap',
].reduce(
(obj, x) => {
obj[x.toLowerCase()] = x
return obj
},
{ for: 'htmlFor' }
)
const namedCodesToUnicode = {
amp: '\u0026',
apos: '\u0027',
gt: '\u003e',
lt: '\u003c',
nbsp: '\u00a0',
quot: '\u201c',
} as const
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]*?)?\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 FOOTNOTE_R = /^\[\^([^\]]+)](:.*)\n/
const FOOTNOTE_REFERENCE_R = /^\[\^([^\]]+)]/
const FORMFEED_R = /\f/g
const FRONT_MATTER_R = /^---[ \t]*\n(.|\n)*\n---[ \t]*\n/
const GFM_TASK_R = /^\s*?\[(x|\s)\]/
const HEADING_R = /^ *(#{1,6}) *([^\n]+?)(?: +#*)?(?:\n *)*(?:\n|$)/
const HEADING_ATX_COMPLIANT_R =
/^ *(#{1,6}) +([^\n]+?)(?: +#*)?(?:\n *)*(?:\n|$)/
const HEADING_SETEXT_R = /^([^\n]+)\n *(=|-){3,} *(?:\n *)+\n/
/**
* Explanation:
*
* 1. Look for a starting tag, preceded 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-z][^ >/]* ?\/>)<([a-z][^ >/]*) ?([^>]*)\/{0}>\n?(\s*(?:<\1[^>]*?>[\s\S]*?<\/\1>|(?!<\1)[\s\S])*?)<\/\1>\n*/i
const HTML_CHAR_CODE_R = /&([a-z0-9]+|#[0-9]{1,6}|#x[0-9a-fA-F]{1,6});/gi
const HTML_COMMENT_R = /^<!--[\s\S]*?(?:-->)/
/**
* 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_.-]*$/
const HTML_SELF_CLOSING_ELEMENT_R =
/^ *<([a-z][a-z0-9:]*)(?:\s+((?:<.*?>|[^>])*))?\/?>(?!<\/\1>)(\s*\n)?/i
const INTERPOLATION_R = /^\{.*\}$/
const LINK_AUTOLINK_BARE_URL_R = /^(https?:\/\/[^\s<]+[^<.,:;"')\]\s])/
const LINK_AUTOLINK_MAILTO_R = /^<([^ >]+@[^ >]+)>/
const LINK_AUTOLINK_R = /^<([^ >]+:\/[^ >]+)>/
const CAPTURE_LETTER_AFTER_HYPHEN = /-([a-z])?/gi
const NP_TABLE_R = /^(.*\|?.*)\n *(\|? *[-:]+ *\|[-| :]*)\n((?:.*\|.*\n)*)\n?/
const PARAGRAPH_R = /^[^\n]+(?: \n|\n{2,})/
const REFERENCE_IMAGE_OR_LINK = /^\[([^\]]*)\]:\s+<?([^\s>]+)>?\s*("([^"]*)")?/
const REFERENCE_IMAGE_R = /^!\[([^\]]*)\] ?\[([^\]]*)\]/
const REFERENCE_LINK_R = /^\[([^\]]*)\] ?\[([^\]]*)\]/
const SQUARE_BRACKETS_R = /(\[|\])/g
const SHOULD_RENDER_AS_BLOCK_R = /(\n|^[-*]\s|^#|^ {2,}|^-{2,}|^>\s)/
const TAB_R = /\t/g
const TABLE_SEPARATOR_R = /^ *\| */
const TABLE_TRIM_PIPES = /(^ *\||\| *$)/g
const TABLE_CELL_END_TRIM = / *$/
const TABLE_CENTER_ALIGN = /^ *:-+: *$/
const TABLE_LEFT_ALIGN = /^ *:-+ *$/
const TABLE_RIGHT_ALIGN = /^ *-+: *$/
const TEXT_BOLD_R =
/^([*_])\1((?:\[.*?\][([].*?[)\]]|<.*?>(?:.*?<.*?>)?|`.*?`|~+.*?~+|.)*?)\1\1(?!\1)/
const TEXT_EMPHASIZED_R =
/^([*_])((?:\[.*?\][([].*?[)\]]|<.*?>(?:.*?<.*?>)?|`.*?`|~+.*?~+|.)*?)\1(?!\1|\w)/
const TEXT_MARKED_R = /^==((?:\[.*?\]|<.*?>(?:.*?<.*?>)?|`.*?`|.)*?)==/
const TEXT_STRIKETHROUGHED_R = /^~~((?:\[.*?\]|<.*?>(?:.*?<.*?>)?|`.*?`|.)*?)~~/
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|$)/i
const TRIMstartING_NEWLINES = /^\n+/
const HTML_LEFT_TRIM_AMOUNT_R = /^([ \t]*)/
const UNESCAPE_URL_R = /\\([^\\])/g
type LIST_TYPE = 1 | 2
const ORDERED: LIST_TYPE = 1
const UNORDERED: LIST_TYPE = 2
const LIST_ITEM_END_R = / *\n+$/
const LIST_LOOKBEHIND_R = /(?:^|\n)( *)$/
// recognize a `*` `-`, `+`, `1.`, `2.`... list bullet
const ORDERED_LIST_BULLET = '(?:\\d+\\.)'
const UNORDERED_LIST_BULLET = '(?:[*+-])'
function generateListItemPrefix(type: LIST_TYPE) {
return (
'( *)(' +
(type === ORDERED ? ORDERED_LIST_BULLET : UNORDERED_LIST_BULLET) +
') +'
)
}
// recognize the start of a list item:
// leading space plus a bullet plus a space (` * `)
const ORDERED_LIST_ITEM_PREFIX = generateListItemPrefix(ORDERED)
const UNORDERED_LIST_ITEM_PREFIX = generateListItemPrefix(UNORDERED)
function generateListItemPrefixRegex(type: LIST_TYPE) {
return new RegExp(
'^' +
(type === ORDERED ? ORDERED_LIST_ITEM_PREFIX : UNORDERED_LIST_ITEM_PREFIX)
)
}
const ORDERED_LIST_ITEM_PREFIX_R = generateListItemPrefixRegex(ORDERED)
const UNORDERED_LIST_ITEM_PREFIX_R = generateListItemPrefixRegex(UNORDERED)
function generateListItemRegex(type: LIST_TYPE) {
// recognize an individual list item:
// * hi
// this is part of the same item
//
// as is this, which is a new paragraph in the same item
//
// * but this is not part of the same item
return new RegExp(
'^' +
(type === ORDERED
? ORDERED_LIST_ITEM_PREFIX
: UNORDERED_LIST_ITEM_PREFIX) +
'[^\\n]*(?:\\n' +
'(?!\\1' +
(type === ORDERED ? ORDERED_LIST_BULLET : UNORDERED_LIST_BULLET) +
' )[^\\n]*)*(\\n|$)',
'gm'
)
}
const ORDERED_LIST_ITEM_R = generateListItemRegex(ORDERED)
const UNORDERED_LIST_ITEM_R = generateListItemRegex(UNORDERED)
// check whether a list item has paragraphs: if it does,
// we leave the newlines at the end
function generateListRegex(type: LIST_TYPE) {
const bullet = type === ORDERED ? ORDERED_LIST_BULLET : UNORDERED_LIST_BULLET
return new RegExp(
'^( *)(' +
bullet +
') ' +
'[\\s\\S]+?(?:\\n{2,}(?! )' +
'(?!\\1' +
bullet +
' (?!' +
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 ORDERED_LIST_R = generateListRegex(ORDERED)
const UNORDERED_LIST_R = generateListRegex(UNORDERED)
function generateListRule(
h: any,
type: LIST_TYPE
): MarkdownToJSX.Rule<
MarkdownToJSX.OrderedListNode | MarkdownToJSX.UnorderedListNode
> {
const ordered = type === ORDERED
const LIST_R = ordered ? ORDERED_LIST_R : UNORDERED_LIST_R
const LIST_ITEM_R = ordered ? ORDERED_LIST_ITEM_R : UNORDERED_LIST_ITEM_R
const LIST_ITEM_PREFIX_R = ordered
? ORDERED_LIST_ITEM_PREFIX_R
: UNORDERED_LIST_ITEM_PREFIX_R
return {
match(source, state, prevCapture) {
// We only want to break into a list if we are at the start of a
// line. This is to avoid parsing "hi * there" with "* there"
// becoming a part of a list.
// You might wonder, "but that's inline, so of course it wouldn't
// start a list?". You would be correct! Except that some of our
// lists can be inline, because they might be inside another list,
// in which case we can parse with inline scope, but need to allow
// nested lists inside this inline scope.
const isStartOfLine = LIST_LOOKBEHIND_R.exec(prevCapture)
const isListBlock = state.list || (!state.inline && !state.simple)
if (isStartOfLine && isListBlock) {
source = isStartOfLine[1] + source
return LIST_R.exec(source)
} else {
return null
}
},
order: Priority.HIGH,
parse(capture, parse, state) {
const bullet = capture[2]
const start = ordered ? +bullet : undefined
const items = capture[0]
// recognize the end of a paragraph block inside a list item:
// two or more newlines at end end of the item
.replace(BLOCK_END_R, '\n')
.match(LIST_ITEM_R)
let lastItemWasAParagraph = false
const itemContent = items.map(function (item, i) {
// We need to see how far indented the item is:
const space = LIST_ITEM_PREFIX_R.exec(item)[0].length
// And then we construct a regex to "unindent" the subsequent
// lines of the items by that amount:
const spaceRegex = new RegExp('^ {1,' + space + '}', 'gm')
// Before processing the item, we need a couple things
const content = item
// remove indents on trailing lines:
.replace(spaceRegex, '')
// remove the bullet:
.replace(LIST_ITEM_PREFIX_R, '')
// Handling "loose" lists, like:
//
// * this is wrapped in a paragraph
//
// * as is this
//
// * as is this
const isLastItem = i === items.length - 1
const containsBlocks = content.indexOf('\n\n') !== -1
// Any element in a list is a block if it contains multiple
// newlines. The last element in the list can also be a block
// if the previous item in the list was a block (this is
// because non-last items in the list can end with \n\n, but
// the last item can't, so we just "inherit" this property
// from our previous element).
const thisItemIsAParagraph =
containsBlocks || (isLastItem && lastItemWasAParagraph)
lastItemWasAParagraph = thisItemIsAParagraph
// backup our state for restoration afterwards. We're going to
// want to set state.list to true, and state.inline depending
// on our list's looseness.
const oldStateInline = state.inline
const oldStateList = state.list
state.list = true
// Parse inline if we're in a tight list, or block if we're in
// a loose list.
let adjustedContent
if (thisItemIsAParagraph) {
state.inline = false
adjustedContent = content.replace(LIST_ITEM_END_R, '\n\n')
} else {
state.inline = true
adjustedContent = content.replace(LIST_ITEM_END_R, '')
}
const result = parse(adjustedContent, state)
// Restore our state before returning
state.inline = oldStateInline
state.list = oldStateList
return result
})
return {
items: itemContent,
ordered: ordered,
start: start,
}
},
render(node, output, state) {
const Tag = node.ordered ? 'ol' : 'ul'
return (
<Tag
key={state.key}
start={node.type === RuleType.orderedList ? node.start : undefined}
>
{node.items.map(function generateListItem(item, i) {
return <li key={i}>{output(item, state)}</li>
})}
</Tag>
)
},
}
}
const LINK_R = /^\[([^\]]*)]\( *((?:\([^)]*\)|[^() ])*) *"?([^)"]*)?"?\)/
const IMAGE_R = /^!\[([^\]]*)]\( *((?:\([^)]*\)|[^() ])*) *"?([^)"]*)?"?\)/
const NON_PARAGRAPH_BLOCK_SYNTAXES = [
BLOCKQUOTE_R,
CODE_BLOCK_FENCED_R,
CODE_BLOCK_R,
HEADING_R,
HEADING_SETEXT_R,
HEADING_ATX_COMPLIANT_R,
HTML_COMMENT_R,
NP_TABLE_R,
ORDERED_LIST_ITEM_R,
ORDERED_LIST_R,
UNORDERED_LIST_ITEM_R,
UNORDERED_LIST_R,
]
const BLOCK_SYNTAXES = [
...NON_PARAGRAPH_BLOCK_SYNTAXES,
PARAGRAPH_R,
HTML_BLOCK_ELEMENT_R,
HTML_SELF_CLOSING_ELEMENT_R,
]
function containsBlockSyntax(input: string) {
return BLOCK_SYNTAXES.some(r => r.test(input))
}
/** Remove symmetrical leading and trailing quotes */
function unquote(str: string) {
const first = str[0]
if (
(first === '"' || first === "'") &&
str.length >= 2 &&
str[str.length - 1] === first
) {
return str.slice(1, -1)
}
return str
}
// based on https://stackoverflow.com/a/18123682/1141611
// not complete, but probably good enough
function slugify(str: string) {
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: string) {
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 parseTableRow(
source: string,
parse: MarkdownToJSX.NestedParser,
state: MarkdownToJSX.State
): MarkdownToJSX.ParserResult[][] {
const prevInTable = state.inTable
state.inTable = true
const tableRow = parse(source.trim(), state)
state.inTable = prevInTable
let cells = [[]]
tableRow.forEach(function (node, i) {
if (node.type === RuleType.tableSeparator) {
// Filter out empty table separators at the start/end:
if (i !== 0 && i !== tableRow.length - 1) {
// Split the current row:
cells.push([])
}
} else {
if (
node.type === RuleType.text &&
(tableRow[i + 1] == null ||
tableRow[i + 1].type === RuleType.tableSeparator)
) {
node.text = node.text.replace(TABLE_CELL_END_TRIM, '')
}
cells[cells.length - 1].push(node)
}
})
return cells
}
function parseTableAlign(source: string /*, parse, state*/) {
const alignText = source.replace(TABLE_TRIM_PIPES, '').split('|')
return alignText.map(parseTableAlignCapture)
}
function parseTableCells(
source: string,
parse: MarkdownToJSX.NestedParser,
state: MarkdownToJSX.State
) {
const rowsText = source.trim().split('\n')
return rowsText.map(function (rowText) {
return parseTableRow(rowText, parse, state)
})
}
function parseTable(
capture: RegExpMatchArray,
parse: MarkdownToJSX.NestedParser,
state: MarkdownToJSX.State
) {
state.inline = true
const header = parseTableRow(capture[1], parse, state)
const align = parseTableAlign(capture[2])
const cells = parseTableCells(capture[3], parse, state)
state.inline = false
return {
align: align,
cells: cells,
header: header,
type: RuleType.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 attributeValueToJSXPropValue(
key: keyof React.AllHTMLAttributes<Element>,
value: string
): any {
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, substr =>
substr[1].toUpperCase()
)
// key.length + 1 to skip over the colon
styles[camelCasedKey] = kvPair.slice(key.length + 1).trim()
return styles
}, {})
} else if (key === 'href' || key === 'src') {
return sanitizeUrl(value)
} else if (value.match(INTERPOLATION_R)) {
// 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: string): string {
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: MarkdownToJSX.Rules
): (
source: string,
state: MarkdownToJSX.State
) => ReturnType<MarkdownToJSX.NestedParser> {
// Sorts rules in order of increasing order, then
// ascending rule name in case of ties.
let ruleList = Object.keys(rules)
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))
) {
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
// Sort based on increasing order
if (orderA !== orderB) {
return orderA - orderB
} else if (typeA < typeB) {
return -1
}
return 1
})
function nestedParse(
source: string,
state: MarkdownToJSX.State
): MarkdownToJSX.ParserResult[] {
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 as unknown as 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: RegExp) {
return function match(source, state: MarkdownToJSX.State) {
if (state.inline) {
return regex.exec(source)
} else {
return null
}
}
}
// basically any inline element except links
function simpleInlineRegex(regex: RegExp) {
return function match(source: string, state: MarkdownToJSX.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: RegExp) {
return function match(source: string, state: MarkdownToJSX.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: RegExp) {
return function match(source: string /*, state*/) {
return regex.exec(source)
}
}
function matchParagraph(
source: string,
state: MarkdownToJSX.State,
prevCapturedString?: string
) {
if (state.inline || state.simple) {
return null
}
if (prevCapturedString && !prevCapturedString.endsWith('\n')) {
// don't match continuation of a line
return null
}
let match = ''
source.split('\n').every(line => {
// bail out on first sign of non-paragraph block
if (NON_PARAGRAPH_BLOCK_SYNTAXES.some(regex => regex.test(line))) {
return false
}
match += line + '\n'
return line.trim()
})
const captured = match.trimEnd()
if (captured == '') {
return null
}
return [match, captured]
}
function sanitizeUrl(url: string): string | undefined {
try {
const decoded = decodeURIComponent(url).replace(/[^A-Za-z0-9/:]/g, '')
if (decoded.match(/^\s*(javascript|vbscript|data(?!:image)):/i)) {
if (process.env.NODE_ENV !== 'production') {
console.warn(
'Anchor URL contains an unsafe JavaScript/VBScript/data expression, it will not be rendered.',
decoded
)
}
return undefined
}
} catch (e) {
if (process.env.NODE_ENV !== 'production') {
console.warn(
'Anchor URL could not be decoded due to malformed syntax or characters, it will not be rendered.',
url
)
}
// 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: string): string {
return rawUrlString.replace(UNESCAPE_URL_R, '$1')
}
/**
* Everything inline, including links.
*/
function parseInline(
parse: MarkdownToJSX.NestedParser,
children: string,
state: MarkdownToJSX.State
): MarkdownToJSX.ParserResult[] {
const isCurrentlyInline = state.inline || false
const isCurrentlySimple = state.simple || false
state.inline = true
state.simple = true
const result = parse(children, state)
state.inline = isCurrentlyInline
state.simple = isCurrentlySimple
return result
}
/**
* Anything inline that isn't a link.
*/
function parseSimpleInline(
parse: MarkdownToJSX.NestedParser,
children: string,
state: MarkdownToJSX.State
): MarkdownToJSX.ParserResult[] {
const isCurrentlyInline = state.inline || false
const isCurrentlySimple = state.simple || false
state.inline = false
state.simple = true
const result = parse(children, state)
state.inline = isCurrentlyInline
state.simple = isCurrentlySimple
return result
}
function parseBlock(
parse,
children,
state: MarkdownToJSX.State
): MarkdownToJSX.ParserResult[] {
state.inline = false
return parse(children, state)
}
const parseCaptureInline: MarkdownToJSX.Parser<{
children: MarkdownToJSX.ParserResult[]
}> = (capture, parse, state: MarkdownToJSX.State) => {
return {
children: parseInline(parse, capture[1], state),
}
}
function captureNothing() {
return {}
}
function renderNothing() {
return null
}
function reactFor(render) {
return function patchedRender(
ast: MarkdownToJSX.ParserResult | MarkdownToJSX.ParserResult[],
state: MarkdownToJSX.State = {}
): React.ReactChild[] {
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 = patchedRender(ast[i], state)
const isString = typeof nodeOut === 'string'
if (isString && lastWasString) {
result[result.length - 1] += nodeOut
} else if (nodeOut !== null) {
result.push(nodeOut)
}
lastWasString = isString
}
state.key = oldKey
return result
}
return render(ast, patchedRender, state)
}
}