` elements. Useful for allowing inline markdown\nformatting in one-line fields where paragraphs, lists, etc. are\ndisallowed.\n\n#### `SimpleMarkdown.defaultImplicitParse(source)`\n\nParses `source` as block if it ends with `\\n\\n`, or inline if not.\n\n#### `SimpleMarkdown.defaultReactOutput(syntaxTree)`\n\nReturns React-renderable output for `syntaxTree`.\n\n#### `SimpleMarkdown.defaultHtmlOutput(syntaxTree)`\n\nReturns the html string output for `syntaxTree`\n\n\nExtension Overview\n==================\n\nElements in simple-markdown are generally created from rules.\nFor parsing, rules must specify `match` and `parse` methods.\nFor output, rules must specify a `react` or `html` method\n(or both), depending on which outputter you create afterwards.\n\nLet's build an example rule to recognize `@` handles, like @ariabuckles\n\n```javascript\n atHandle: {\n match: function(source) {\n // `match` returns the result of a regex exec\n // such a regex should always begin with `^`, as it will\n // always be called to check whether the beginning of the\n // input matches the rule\n // This regex matches @handles at the current source position (^)\n return /^\\@([a-zA-Z_]+)/.exec(source);\n },\n parse: function(capture) {\n // `parse` returns the AST node for this rule, given\n // `capture`, the result of a successful `match` call\n\n // capture[1] is the ([a-zA-Z_]+) name group from the `match` regex\n return {\n type: 'atHandle',\n username: capture[1]\n };\n },\n react: function(node) {\n // given an AST node from `parse`, how should we render it in react?\n // (Note: you don't need this if you are only rendering to html)\n\n return \n @{node.username}\n ;\n },\n html: function(node, recurseOutput) {\n // or, how should we render this node in html\n // (Note: you don't need this if you are rendering to react)\n\n return '@' + node.username + '';\n },\n },\n```\n\nBy using the above rule, we can transform `@ariabuckles` into @ariabuckles\n\nLet's look at those three methods in more detail.\n\n#### `match(source, state, lookbehind)`\n\nsimple-markdown calls your `match` function to determine whether the\nupcoming markdown source matches this rule or not.\n\n`source` is the upcoming source, beginning at the current position of\nparsing (source[0] is the next character).\n\n`state` is a mutable state object to allow for more complicated matching\nand parsing. The most common field on `state` is `inline`, which all of\nthe default rules set to true when we are in an inline scope, and false\nor undefined when we are in a block scope.\n\n`lookbehind` is the string previously captured at this parsing level, to\nallow for lookbehind. For example, lists check that lookbehind ends with\n`/^$|\\n *$/` to ensure that lists only match at the beginning of a new\nline.\n\nIf this rule matches, `match` should return an object, array, or\narray-like object, which we'll call `capture`, where `capture[0]`\nis the full matched source, and any other fields can be used in the\nrule's `parse` function. The return value from `Regexp.prototype.exec`\nfits this requirement, and the common use case is to return the result\nof `someRegex.exec(source)`.\n\nIf this rule does not match, `match` should return null.\n\nNOTE: If you are using regexes in your match function, your regex\nshould always begin with `^`. Regexes without leading `^`s can\ncause unexpected output or infinite loops.\n\n#### `parse(capture, recurseParse, state)`\n\n`parse` takes the output of `match` and transforms it into a syntax\ntree node object, which we'll call `node` here.\n\n`capture` is the non-null result returned from match.\n\n`recurseParse` is a function that can be called on sub-content and\nstate to recursively parse the sub-content. This returns an array.\n\n`state` is the mutable state threading object, which can be examined\nor modified, and should be passed as the third argument to any\n`recurseParse` calls.\n\nFor example, to parse inline sub-content, you can add `inline: true`\nto state, or `inline: false` to force block parsing (to leave the\nparsing scope alone, you can just pass `state` with no modifications).\nFor example:\n\n```javascript\n var innerText = capture[1];\n recurseParse(innerText, _.defaults({\n inline: true\n }, state));\n```\n \n`parse` should return a `node` object, which can have custom fields\nthat will be passed to `output`, below. The one reserved field is\n`type`, which designates the type of the node, which will be used\nfor output. If no type is specified, simple-markdown will use the\ncurrent rule's type (the common case). If you have multiple ways\nto parse a single element, it can be useful to have multiple rules\nthat all return nodes of the same type.\n\n#### `react(node, recurseOutput, state)`\n\n`react` takes a syntax tree `node` and transforms it into\nReact-renderable output.\n\n`node` is the return value from `parse`, which has a type\nfield of the same type as the current rule, as well as any\ncustom fields created by `parse`.\n\n`recurseOutput` is a function to recursively output sub-tree\nnodes created by using `recurseParse` in `parse`.\n\n`state` is the mutable state threading object, which can be\nexamined or modified, and should be passed as the second\nargument to any recurseOutput calls.\n\nThe simple-markdown API contains several helper methods for\ncreating rules, as well as methods for creating parsers and\noutputters from rules.\n\nExtension API\n=============\n\nsimple-markdown includes access to the default list of rules,\nas well as several functions to allow you to create parsers and\noutputters from modifications of those default rules, or even\nfrom a totally custom rule list.\n\nThese functions are separated so that you can customize\nintermediate steps in the parsing/output process, if necessary.\n\n#### `SimpleMarkdown.defaultRules`\n\nThe default rules, specified as an object, where the keys are\nthe rule types, and the values are objects containing `order`,\n`match`, `parse`, `react`, and `html` fields (these rules can\nbe used for both parsing and outputting).\n\n#### `SimpleMarkdown.parserFor(rules)`\n\nTakes a `rules` object and returns a parser for the rule types\nin the rules object, in order of increasing `order` fields,\nwhich must be present and a finite number for each rule.\nIn the case of order field ties, rules are ordered\nlexicographically by rule name. Each of the rules in the `rules`\nobject must contain a `match` and a `parse` function.\n\n#### `SimpleMarkdown.outputFor(rules, key)`\n\nTakes a `rules` object, containing a set of rules, each with an\noutput function at the `key` index (either `'react'` or `'html'`,\nunless you are custom output type), and returns an output\nfunction that takes a tree returned by the parser.\n\n#### Putting it all together\n\nGiven a set of rules, one can create a single function\nthat takes an input content string and outputs a\nReact-renderable as follows. Note that since many rules\nexpect blocks to end in `\"\\n\\n\"`, we append that to source\ninput manually, in addition to specifying `inline: false`\n(`inline: false` is technically optional for all of the\ndefault rules, which assume `inline` is false if it is\nundefined).\n\n\nExtension rules helper functions\n================================\n\n*Coming soon*\n\n\nQuirks\n======\n\nBecause of its design goals of simplicity and extensibility, simple-markdown\nhas a few quirks you may run into:\n\n### Empty lines required between blocks\n\nMany markdown parsers allow blocks to be placed on adjacent lines, as long\nas they are different types of block. For example:\n\n`````markdown\nParagraph\n```\ncode\n```\n`````\n\nrenders as `
Paragraph
code{output(node.content, state)}
;\n }\n }),\n};\n\nvar parse = SimpleMarkdown.parserFor(rules);\nvar outputReact = SimpleMarkdown.outputFor(rules, 'react');\nvar outputHtml = SimpleMarkdown.outputFor(rules, 'html');\n\nvar markdownToReact = function(source) {\n return outputReact(parse(source));\n};\n\nvar markdownToHtml = function(source) {\n return outputHtml(parser(source));\n};\n```\n\n[no_div_in_p]: https://stackoverflow.com/questions/8397852/why-p-tag-cant-contain-div-tag-inside-it\n\n\nLICENSE\n=======\n\nMIT. See the LICENSE file for text.\n\n\n\nMisc.\n=====\n\nI haven't figured out where to put the following examples in the readme:\n\n### Colored Links\n\nFor example, if you wanted to make each link a different colour, you could\ndo so using `state`. We haven't covered all the concepts in this example yet,\nbut it helps demonstrate some of how `state` can provide more power to your\nparser/outputter:\n\n```javascript\n// Define an array of colours we want to use\nvar colors = ['red', 'orange', 'yellow', 'green', 'blue', 'purple'];\n\n// Define our parser/outputter's rules, basing them off\n// of SimpleMarkdown.defaultRules:\nvar rules = Object.assign({}, SimpleMarkdown.defaultRules, {\n\n // Create a modified link rule...\n link: Object.assign({}, SimpleMarkdown.defaultRules.link, {\n\n // ...with a custom output function:\n react: (node, output, state) => {\n\n // Store the number of links we've encountered so\n // far on the `state` object.\n if (state.linkCount === undefined) {\n // If this is our first link, we can start at 0\n state.linkCount = 0;\n } else {\n // otherwise, we can increment our link counter\n state.linkCount = state.linkCount + 1;\n }\n \n // Calculate what colour we want this specific link to be\n var color = colors[state.linkCount % colors.length];\n\n // Sanitize the url for this node.\n // (not relevant to this example, but important to do\n // for links, so it's included here!\n var href = SimpleMarkdown.sanitizeUrl(node.url);\n\n // Then return the react/jsx node for this link.\n // Note we're using the color variable from earlier for style.\n return \n {output(node.content)}\n ;\n },\n 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log](https://github.com/Khan/simple-markdown/releases)\n\nPhilosophy\n----------\n\nMost markdown-like parsers aim for [speed][marked] or\n[edge case handling][CommonMark].\nsimple-markdown aims for extensibility and simplicity.\n\n[marked]: https://github.com/chjj/marked\n[CommonMark]: https://github.com/jgm/CommonMark\n\nWhat does this mean?\nMany websites using markdown-like languages have custom extensions,\nsuch as `@`mentions or issue number linking. Unfortunately, most\nmarkdown-like parsers don't allow extension without\nforking, and can be difficult to modify even when forked.\nsimple-markdown is designed to allow simple addition of\ncustom extensions without needing to be forked.\n\nAt Khan Academy, we use simple-markdown to format\nover half of our math exercises, because we need\n[markdown extensions][PerseusMarkdown] for math text and\ninteractive widgets.\n\n[PerseusMarkdown]: https://github.com/Khan/perseus/blob/master/src/perseus-markdown.jsx\n\nsimple-markdown is [MIT licensed][LICENSE].\n\n[LICENSE]: https://github.com/Khan/simple-markdown/blob/master/LICENSE\n\nGetting started\n---------------\n\nFirst, let's parse and output some generic markdown using\nsimple-markdown.\n\nIf you want to run these examples in\nnode, you should run `npm install` in the simple-markdown\nfolder or `npm install simple-markdown` in your project's\nfolder. Then you can acquire the `SimpleMarkdown` variable\nwith:\n\n```javascript\n var SimpleMarkdown = require(\"simple-markdown\");\n```\n\nThen let's get a basic markdown parser and outputter.\n`SimpleMarkdown` provides default parsers/outputters for\ngeneric markdown:\n\n```javascript\n var mdParse = SimpleMarkdown.defaultBlockParse;\n var mdOutput = SimpleMarkdown.defaultOutput;\n```\n\n`mdParse` can give us a syntax tree:\n\n```javascript\n var syntaxTree = mdParse(\"Here is a paragraph and an *em tag*.\");\n```\n\nLet's inspect our syntax tree:\n\n```javascript\n // pretty-print this with 4-space indentation:\n console.log(JSON.stringify(syntaxTree, null, 4));\n => [\n {\n \"content\": [\n {\n \"content\": \"Here is a paragraph and an \",\n \"type\": \"text\"\n },\n {\n \"content\": [\n {\n \"content\": \"em tag\",\n \"type\": \"text\"\n }\n ],\n \"type\": \"em\"\n },\n {\n \"content\": \".\",\n \"type\": \"text\"\n }\n ],\n \"type\": \"paragraph\"\n }\n ]\n```\n\nThen to turn that into an array of React elements, we can\ncall `mdOutput`:\n\n```javascript\n mdOutput(syntaxTree)\n => [ { type: 'div',\n key: null,\n ref: null,\n _owner: null,\n _context: {},\n _store: { validated: false, props: [Object] } } ]\n```\n\n\nAdding a simple extension\n-------------------------\n\nLet's add an underline extension! To do this, we'll need to create\na new rule and then make a new parser/outputter. The next section\nwill explain how all of these steps work in greater detail. (To\nfollow along with these examples, you'll also need\n[underscore][underscore].)\n\n[underscore]: http://underscorejs.org/\n\nFirst, we create a new rule. We'll look for double underscores\nsurrounding text.\n\nWe'll put underlines right\nbefore `em`s, so that `__` will be parsed before `_`\nfor emphasis/italics.\n\nA regex to capture this would look something\nlike `/^__([\\s\\S]+?)__(?!_)/`. This matches `__`, followed by\nany content until it finds another `__` not followed by a\nthird `_`.\n\n```javascript\n var underlineRule = {\n // Specify the order in which this rule is to be run\n order: SimpleMarkdown.defaultRules.em.order - 0.5,\n \n // First we check whether a string matches\n match: function(source) {\n return /^__([\\s\\S]+?)__(?!_)/.exec(source);\n },\n \n // Then parse this string into a syntax node\n parse: function(capture, parse, state) {\n return {\n content: parse(capture[1], state)\n };\n },\n \n // Finally transform this syntax node into a\n // React element\n react: function(node, output) {\n return React.DOM.u(null, output(node.content));\n },\n\n // Or an html element:\n // (Note: you may only need to make one of `react:` or\n // `html:`, as long as you never ask for an outputter\n // for the other type.)\n html: function(node, output) {\n return '' + output(node.content) + '';\n },\n };\n```\n\nThen, we need to add this rule to the other rules:\n\n```javascript\n var rules = _.extend({}, SimpleMarkdown.defaultRules, {\n underline: underlineRule\n });\n```\n\nFinally, we need to build our parser and outputters:\n\n```javascript\n var rawBuiltParser = SimpleMarkdown.parserFor(rules);\n var parse = function(source) {\n var blockSource = source + \"\\n\\n\";\n return rawBuiltParser(blockSource, {inline: false});\n };\n // You probably only need one of these: choose depending on\n // whether you want react nodes or an html string:\n var reactOutput = SimpleMarkdown.reactFor(SimpleMarkdown.ruleOutput(rules, 'react'));\n var htmlOutput = SimpleMarkdown.htmlFor(SimpleMarkdown.ruleOutput(rules, 'html'));\n```\n\nNow we can use our custom `parse` and `output` functions to parse\nmarkdown with underlines!\n\n```javascript\n var syntaxTree = parse(\"__hello underlines__\");\n console.log(JSON.stringify(syntaxTree, null, 4));\n => [\n {\n \"content\": [\n {\n \"content\": [\n {\n \"content\": \"hello underlines\",\n \"type\": \"text\"\n }\n ],\n \"type\": \"underline\"\n }\n ],\n \"type\": \"paragraph\"\n }\n ]\n \n reactOutput(syntaxTree)\n => [ { type: 'div',\n key: null,\n ref: null,\n _owner: null,\n _context: {},\n _store: { validated: false, props: [Object] } } ]\n\n htmlOutput(syntaxTree)\n\n => '` elements. Useful for allowing inline markdown\nformatting in one-line fields where paragraphs, lists, etc. are\ndisallowed.\n\n#### `SimpleMarkdown.defaultImplicitParse(source)`\n\nParses `source` as block if it ends with `\\n\\n`, or inline if not.\n\n#### `SimpleMarkdown.defaultOutput(syntaxTree)`\n\nReturns React-renderable output for `syntaxTree`.\n\n*Note: raw html output will be coming soon*\n\n\nExtension Overview\n------------------\n\nElements in simple-markdown are generally created from rules.\nFor parsing, rules must specify `match` and `parse` methods.\nFor output, rules must specify a `react` or `html` method\n(or both), depending on which outputter you create afterwards.\n\nHere is an example rule, a slightly modified version of what\nsimple-markdown uses for parsing **strong** (**bold**) text:\n\n```javascript\n strong: {\n match: function(source, state, lookbehind) {\n return /^\\*\\*([\\s\\S]+?)\\*\\*(?!\\*)/.exec(source);\n },\n parse: function(capture, recurseParse, state) {\n return {\n content: recurseParse(capture[1], state)\n };\n },\n react: function(node, recurseOutput) {\n return React.DOM.strong(null, recurseOutput(node.content));\n },\n html: function(node, recurseOutput) {\n return '' + recurseOutput(node.content) + '';\n },\n },\n```\n\nLet's look at those three methods in more detail.\n\n#### `match(source, state, lookbehind)`\n\nsimple-markdown calls your `match` function to determine whether the\nupcoming markdown source matches this rule or not.\n\n`source` is the upcoming source, beginning at the current position of\nparsing (source[0] is the next character).\n\n`state` is a mutable state object to allow for more complicated matching\nand parsing. The most common field on `state` is `inline`, which all of\nthe default rules set to true when we are in an inline scope, and false\nor undefined when we are in a block scope.\n\n**DEPRECATED - use `state.prevCapture` instead.** `lookbehind` is the string previously captured at this parsing level, to\nallow for lookbehind. For example, lists check that lookbehind ends with\n`/^$|\\n *$/` to ensure that lists only match at the beginning of a new\nline.\n\nIf this rule matches, `match` should return an object, array, or\narray-like object, which we'll call `capture`, where `capture[0]`\nis the full matched source, and any other fields can be used in the\nrule's `parse` function. The return value from `Regexp.prototype.exec`\nfits this requirement, and the common use case is to return the result\nof `someRegex.exec(source)`.\n\nIf this rule does not match, `match` should return null.\n\nNOTE: If you are using regexes in your match function, your regex\nshould always begin with `^`. Regexes without leading `^`s can\ncause unexpected output or infinite loops.\n\n#### `parse(capture, recurseParse, state)`\n\n`parse` takes the output of `match` and transforms it into a syntax\ntree node object, which we'll call `node` here.\n\n`capture` is the non-null result returned from match.\n\n`recurseParse` is a function that can be called on sub-content and\nstate to recursively parse the sub-content. This returns an array.\n\n`state` is the mutable state threading object, which can be examined\nor modified, and should be passed as the third argument to any\n`recurseParse` calls.\n\nFor example, to parse inline sub-content, you can add `inline: true`\nto state, or `inline: false` to force block parsing (to leave the\nparsing scope alone, you can just pass `state` with no modifications).\nFor example:\n\n```javascript\n var innerText = capture[1];\n recurseParse(innerText, _.defaults({\n inline: true\n }, state));\n```\n \n`parse` should return a `node` object, which can have custom fields\nthat will be passed to `output`, below. The one reserved field is\n`type`, which designates the type of the node, which will be used\nfor output. If no type is specified, simple-markdown will use the\ncurrent rule's type (the common case). If you have multiple ways\nto parse a single element, it can be useful to have multiple rules\nthat all return nodes of the same type.\n\n#### `react(node, recurseOutput, state)`\n\n`react` takes a syntax tree `node` and transforms it into\nReact-renderable output.\n\n`node` is the return value from `parse`, which has a type\nfield of the same type as the current rule, as well as any\ncustom fields created by `parse`.\n\n`recurseOutput` is a function to recursively output sub-tree\nnodes created by using `recurseParse` in `parse`.\n\n`state` is the mutable state threading object, which can be\nexamined or modified, and should be passed as the second\nargument to any recurseOutput calls.\n\nThe simple-markdown API contains several helper methods for\ncreating rules, as well as methods for creating parsers and\noutputters from rules.\n\nExtension API\n-------------\n\nsimple-markdown includes access to the default list of rules,\nas well as several functions to allow you to create parsers and\noutputters from modifications of those default rules, or even\nfrom a totally custom rule list.\n\nThese functions are separated so that you can customize\nintermediate steps in the parsing/output process, if necessary.\n\n#### `SimpleMarkdown.defaultRules`\n\nThe default rules, specified as an object, where the keys are\nthe rule types, and the values are objects containing `order`,\n`match`, `parse`, `react`, and `html` fields (these rules can\nbe used for both parsing and outputting).\n\n#### `SimpleMarkdown.parserFor(rules)`\n\nTakes a `rules` object and returns a parser for the rule types\nin the rules object, in order of increasing `order` fields,\nwhich must be present and a finite number for each rule.\nIn the case of order field ties, rules are ordered\nlexicographically by rule name. Each of the rules in the `rules`\nobject must contain a `match` and a `parse` function.\n\n#### `SimpleMarkdown.ruleOutput(rules, key)`\n\nTakes a `rules` object, containing an `output` function for\neach rule, and a `key` into individual elements in that rules\nrules argument (either `'react'` or `'html'`, unless you are\ndefining a custom output type), and returns a function that can\noutput a single syntax tree node of any type that is in the\n`rules` object, given a node and a recursive output function.\nThis is not the final output function because it doesn't handle\narrays of nodes or recursion (see `reactFor` and `htmlFor`).\n\n#### `SimpleMarkdown.reactFor(singleNodeOutputFunction)`\n\nTakes a function that can output react-renderable output for\nany single syntax tree node and returns a function that maps\nover syntax tree arrays correctly.\n\nThe most common use case is to pass the output of\n`ruleOutput` as the parameter to `reactFor`:\n\n```javascript\n var output = SimpleMarkdown.reactFor(SimpleMarkdown.ruleOutput(rules, 'react'));\n```\n\n#### `SimpleMarkdown.htmlFor(singleNodeOutputFunction)`\n\nTakes a function that can output an html string for\nany single syntax tree node and returns a function that maps\nover syntax tree arrays correctly.\n\nThe most common use case is to pass the output of\n`ruleOutput` as the parameter to `htmlFor`:\n\n```javascript\n var output = SimpleMarkdown.htmlFor(SimpleMarkdown.ruleOutput(rules, 'html'));\n```\n\n#### Putting it all together\n\nGiven a set of rules, one can create a single function\nthat takes an input content string and outputs a\nReact-renderable as follows. Note that since many rules\nexpect blocks to end in `\"\\n\\n\"`, we append that to source\ninput manually, in addition to specifying `inline: false`\n(`inline: false` is technically optional for all of the\ndefault rules, which assume `inline` is false if it is\nundefined).\n\n```javascript\nvar rules = {\n ...SimpleMarkdown.defaultRules,\n paragraph: {\n ...SimpleMarkdown.defaultRules.paragraph,\n react: (node, output, state) => {\n return
{output(node.content, state)}
;\n }\n }\n};\n\nvar parser = SimpleMarkdown.parserFor(rules);\nvar reactOutput = SimpleMarkdown.reactFor(SimpleMarkdown.ruleOutput(rules, 'react'));\nvar htmlOutput = SimpleMarkdown.reactFor(SimpleMarkdown.ruleOutput(rules, 'html'));\n\nvar blockParseAndOutput = function(source) {\n // Many rules require content to end in \\n\\n to be interpreted\n // as a block.\n var blockSource = source + \"\\n\\n\";\n var parseTree = parser(blockSource, {inline: false});\n var outputResult = htmlOutput(parseTree);\n // Or for react output, use:\n // var outputResult = reactOutput(parseTree);\n return outputResult;\n};\n```\n\nExtension rules helper functions\n--------------------------------\n\n*Coming soon*\n\nLICENSE\n-------\nMIT. 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simplicity.\n\n[marked]: https://github.com/chjj/marked\n[CommonMark]: https://github.com/jgm/CommonMark\n\nWhat does this mean?\nMany websites using markdown-like languages have custom extensions,\nsuch as `@`mentions or issue number linking. Unfortunately, most\nmarkdown-like parsers don't allow extension without\nforking, and can be difficult to modify even when forked.\nsimple-markdown is designed to allow simple addition of\ncustom extensions without needing to be forked.\n\nAt Khan Academy, we use simple-markdown to format\nover half of our math exercises, because we need\n[markdown extensions][PerseusMarkdown] for math text and\ninteractive widgets.\n\n[PerseusMarkdown]: https://github.com/Khan/perseus/blob/master/src/perseus-markdown.jsx\n\nsimple-markdown is [MIT licensed][LICENSE].\n\n[LICENSE]: https://github.com/Khan/simple-markdown/blob/master/LICENSE\n\nGetting started\n---------------\n\nFirst, let's parse and output some generic markdown using\nsimple-markdown.\n\nIf you want to run these examples in\nnode, you should run `npm install` in the simple-markdown\nfolder or `npm install simple-markdown` in your project's\nfolder. Then you can acquire the `SimpleMarkdown` variable\nwith:\n\n```javascript\n var SimpleMarkdown = require(\"simple-markdown\");\n```\n\nThen let's get a basic markdown parser and outputter.\n`SimpleMarkdown` provides default parsers/outputters for\ngeneric markdown:\n\n```javascript\n var mdParse = SimpleMarkdown.defaultBlockParse;\n var mdOutput = SimpleMarkdown.defaultOutput;\n```\n\n`mdParse` can give us a syntax tree:\n\n```javascript\n var syntaxTree = mdParse(\"Here is a paragraph and an *em tag*.\");\n```\n\nLet's inspect our syntax tree:\n\n```javascript\n // pretty-print this with 4-space indentation:\n console.log(JSON.stringify(syntaxTree, null, 4));\n => [\n {\n \"content\": [\n {\n \"content\": \"Here is a paragraph and an \",\n \"type\": \"text\"\n },\n {\n \"content\": [\n {\n \"content\": \"em tag\",\n \"type\": \"text\"\n }\n ],\n \"type\": \"em\"\n },\n {\n \"content\": \".\",\n \"type\": \"text\"\n }\n ],\n \"type\": \"paragraph\"\n }\n ]\n```\n\nThen to turn that into an array of React elements, we can\ncall `mdOutput`:\n\n```javascript\n mdOutput(syntaxTree)\n => [ { type: 'div',\n key: null,\n ref: null,\n _owner: null,\n _context: {},\n _store: { validated: false, props: [Object] } } ]\n```\n\n\nAdding a simple extension\n-------------------------\n\nLet's add an underline extension! To do this, we'll need to create\na new rule and then make a new parser/outputter. The next section\nwill explain how all of these steps work in greater detail. (To\nfollow along with these examples, you'll also need\n[underscore][underscore].)\n\n[underscore]: http://underscorejs.org/\n\nFirst, we create a new rule. We'll look for double underscores\nsurrounding text.\n\nWe'll put underlines right\nbefore `em`s, so that `__` will be parsed before `_`\nfor emphasis/italics.\n\nA regex to capture this would look something\nlike `/^__([\\s\\S]+?)__(?!_)/`. This matches `__`, followed by\nany content until it finds another `__` not followed by a\nthird `_`.\n\n```javascript\n var underlineRule = {\n // Specify the order in which this rule is to be run\n order: SimpleMarkdown.defaultRules.em.order - 0.5,\n \n // First we check whether a string matches\n match: function(source) {\n return /^__([\\s\\S]+?)__(?!_)/.exec(source);\n },\n \n // Then parse this string into a syntax node\n parse: function(capture, parse, state) {\n return {\n content: parse(capture[1], state)\n };\n },\n \n // Finally transform this syntax node into a\n // React element\n react: function(node, output) {\n return React.DOM.u(null, output(node.content));\n },\n\n // Or an html element:\n // (Note: you may only need to make one of `react:` or\n // `html:`, as long as you never ask for an outputter\n // for the other type.)\n html: function(node, output) {\n return '' + output(node.content) + '';\n },\n };\n```\n\nThen, we need to add this rule to the other rules:\n\n```javascript\n var rules = _.extend({}, SimpleMarkdown.defaultRules, {\n underline: underlineRule\n });\n```\n\nFinally, we need to build our parser and outputters:\n\n```javascript\n var rawBuiltParser = SimpleMarkdown.parserFor(rules);\n var parse = function(source) {\n var blockSource = source + \"\\n\\n\";\n return rawBuiltParser(blockSource, {inline: false});\n };\n // You probably only need one of these: choose depending on\n // whether you want react nodes or an html string:\n var reactOutput = SimpleMarkdown.reactFor(SimpleMarkdown.ruleOutput(rules, 'react'));\n var htmlOutput = SimpleMarkdown.htmlFor(SimpleMarkdown.ruleOutput(rules, 'html'));\n```\n\nNow we can use our custom `parse` and `output` functions to parse\nmarkdown with underlines!\n\n```javascript\n var syntaxTree = parse(\"__hello underlines__\");\n console.log(JSON.stringify(syntaxTree, null, 4));\n => [\n {\n \"content\": [\n {\n \"content\": [\n {\n \"content\": \"hello underlines\",\n \"type\": \"text\"\n }\n ],\n \"type\": \"underline\"\n }\n ],\n \"type\": \"paragraph\"\n }\n ]\n \n reactOutput(syntaxTree)\n => [ { type: 'div',\n key: null,\n ref: null,\n _owner: null,\n _context: {},\n _store: { validated: false, props: [Object] } } ]\n\n htmlOutput(syntaxTree)\n\n => '` elements. Useful for allowing inline markdown\nformatting in one-line fields where paragraphs, lists, etc. are\ndisallowed.\n\n#### `SimpleMarkdown.defaultImplicitParse(source)`\n\nParses `source` as block if it ends with `\\n\\n`, or inline if not.\n\n#### `SimpleMarkdown.defaultOutput(syntaxTree)`\n\nReturns React-renderable output for `syntaxTree`.\n\n*Note: raw html output will be coming soon*\n\n\nExtension Overview\n------------------\n\nElements in simple-markdown are generally created from rules.\nFor parsing, rules must specify `match` and `parse` methods.\nFor output, rules must specify a `react` or `html` method\n(or both), depending on which outputter you create afterwards.\n\nHere is an example rule, a slightly modified version of what\nsimple-markdown uses for parsing **strong** (**bold**) text:\n\n```javascript\n strong: {\n match: function(source, state, lookbehind) {\n return /^\\*\\*([\\s\\S]+?)\\*\\*(?!\\*)/.exec(source);\n },\n parse: function(capture, recurseParse, state) {\n return {\n content: recurseParse(capture[1], state)\n };\n },\n react: function(node, recurseOutput) {\n return React.DOM.strong(null, recurseOutput(node.content));\n },\n html: function(node, recurseOutput) {\n return '' + recurseOutput(node.content) + '';\n },\n },\n```\n\nLet's look at those three methods in more detail.\n\n#### `match(source, state, lookbehind)`\n\nsimple-markdown calls your `match` function to determine whether the\nupcoming markdown source matches this rule or not.\n\n`source` is the upcoming source, beginning at the current position of\nparsing (source[0] is the next character).\n\n`state` is a mutable state object to allow for more complicated matching\nand parsing. The most common field on `state` is `inline`, which all of\nthe default rules set to true when we are in an inline scope, and false\nor undefined when we are in a block scope.\n\n**DEPRECATED - use `state.prevCapture` instead.** `lookbehind` is the string previously captured at this parsing level, to\nallow for lookbehind. For example, lists check that lookbehind ends with\n`/^$|\\n *$/` to ensure that lists only match at the beginning of a new\nline.\n\nIf this rule matches, `match` should return an object, array, or\narray-like object, which we'll call `capture`, where `capture[0]`\nis the full matched source, and any other fields can be used in the\nrule's `parse` function. The return value from `Regexp.prototype.exec`\nfits this requirement, and the common use case is to return the result\nof `someRegex.exec(source)`.\n\nIf this rule does not match, `match` should return null.\n\nNOTE: If you are using regexes in your match function, your regex\nshould always begin with `^`. Regexes without leading `^`s can\ncause unexpected output or infinite loops.\n\n#### `parse(capture, recurseParse, state)`\n\n`parse` takes the output of `match` and transforms it into a syntax\ntree node object, which we'll call `node` here.\n\n`capture` is the non-null result returned from match.\n\n`recurseParse` is a function that can be called on sub-content and\nstate to recursively parse the sub-content. This returns an array.\n\n`state` is the mutable state threading object, which can be examined\nor modified, and should be passed as the third argument to any\n`recurseParse` calls.\n\nFor example, to parse inline sub-content, you can add `inline: true`\nto state, or `inline: false` to force block parsing (to leave the\nparsing scope alone, you can just pass `state` with no modifications).\nFor example:\n\n```javascript\n var innerText = capture[1];\n recurseParse(innerText, _.defaults({\n inline: true\n }, state));\n```\n \n`parse` should return a `node` object, which can have custom fields\nthat will be passed to `output`, below. The one reserved field is\n`type`, which designates the type of the node, which will be used\nfor output. If no type is specified, simple-markdown will use the\ncurrent rule's type (the common case). If you have multiple ways\nto parse a single element, it can be useful to have multiple rules\nthat all return nodes of the same type.\n\n#### `react(node, recurseOutput, state)`\n\n`react` takes a syntax tree `node` and transforms it into\nReact-renderable output.\n\n`node` is the return value from `parse`, which has a type\nfield of the same type as the current rule, as well as any\ncustom fields created by `parse`.\n\n`recurseOutput` is a function to recursively output sub-tree\nnodes created by using `recurseParse` in `parse`.\n\n`state` is the mutable state threading object, which can be\nexamined or modified, and should be passed as the second\nargument to any recurseOutput calls.\n\nThe simple-markdown API contains several helper methods for\ncreating rules, as well as methods for creating parsers and\noutputters from rules.\n\nExtension API\n-------------\n\nsimple-markdown includes access to the default list of rules,\nas well as several functions to allow you to create parsers and\noutputters from modifications of those default rules, or even\nfrom a totally custom rule list.\n\nThese functions are separated so that you can customize\nintermediate steps in the parsing/output process, if necessary.\n\n#### `SimpleMarkdown.defaultRules`\n\nThe default rules, specified as an object, where the keys are\nthe rule types, and the values are objects containing `order`,\n`match`, `parse`, `react`, and `html` fields (these rules can\nbe used for both parsing and outputting).\n\n#### `SimpleMarkdown.parserFor(rules)`\n\nTakes a `rules` object and returns a parser for the rule types\nin the rules object, in order of increasing `order` fields,\nwhich must be present and a finite number for each rule.\nIn the case of order field ties, rules are ordered\nlexicographically by rule name. Each of the rules in the `rules`\nobject must contain a `match` and a `parse` function.\n\n#### `SimpleMarkdown.ruleOutput(rules, key)`\n\nTakes a `rules` object, containing an `output` function for\neach rule, and a `key` into individual elements in that rules\nrules argument (either `'react'` or `'html'`, unless you are\ndefining a custom output type), and returns a function that can\noutput a single syntax tree node of any type that is in the\n`rules` object, given a node and a recursive output function.\nThis is not the final output function because it doesn't handle\narrays of nodes or recursion (see `reactFor` and `htmlFor`).\n\n#### `SimpleMarkdown.reactFor(singleNodeOutputFunction)`\n\nTakes a function that can output react-renderable output for\nany single syntax tree node and returns a function that maps\nover syntax tree arrays correctly.\n\nThe most common use case is to pass the output of\n`ruleOutput` as the parameter to `reactFor`:\n\n```javascript\n var output = SimpleMarkdown.reactFor(SimpleMarkdown.ruleOutput(rules, 'react'));\n```\n\n#### `SimpleMarkdown.htmlFor(singleNodeOutputFunction)`\n\nTakes a function that can output an html string for\nany single syntax tree node and returns a function that maps\nover syntax tree arrays correctly.\n\nThe most common use case is to pass the output of\n`ruleOutput` as the parameter to `htmlFor`:\n\n```javascript\n var output = SimpleMarkdown.htmlFor(SimpleMarkdown.ruleOutput(rules, 'html'));\n```\n\n#### Putting it all together\n\nGiven a set of rules, one can create a single function\nthat takes an input content string and outputs a\nReact-renderable as follows. Note that since many rules\nexpect blocks to end in `\"\\n\\n\"`, we append that to source\ninput manually, in addition to specifying `inline: false`\n(`inline: false` is technically optional for all of the\ndefault rules, which assume `inline` is false if it is\nundefined).\n\n```javascript\nvar rules = {\n ...SimpleMarkdown.defaultRules,\n paragraph: {\n ...SimpleMarkdown.defaultRules.paragraph,\n react: (node, output, state) => {\n return
{output(node.content, state)}
;\n }\n }\n};\n\nvar parser = SimpleMarkdown.parserFor(rules);\nvar reactOutput = SimpleMarkdown.reactFor(SimpleMarkdown.ruleOutput(rules, 'react'));\nvar htmlOutput = SimpleMarkdown.reactFor(SimpleMarkdown.ruleOutput(rules, 'html'));\n\nvar blockParseAndOutput = function(source) {\n // Many rules require content to end in \\n\\n to be interpreted\n // as a block.\n var blockSource = source + \"\\n\\n\";\n var parseTree = parser(blockSource, {inline: false});\n var outputResult = htmlOutput(parseTree);\n // Or for react output, use:\n // var outputResult = reactOutput(parseTree);\n return outputResult;\n};\n```\n\nExtension rules helper functions\n--------------------------------\n\n*Coming soon*\n\nLICENSE\n-------\nMIT. See the LICENSE file for text.\n","maintainers":[{"name":"xymostech","email":"xymostech@gmail.com"},{"name":"ariabuckles","email":"aria@toole1.com"},{"name":"khanacademy","email":"opensource+npm@khanacademy.org"}],"time":{"modified":"2022-06-26T19:43:50.844Z","created":"2015-02-24T03:49:13.176Z","0.0.2":"2015-02-24T03:49:13.176Z","0.0.3":"2015-04-26T17:50:17.120Z","0.0.4":"2015-10-16T22:15:49.981Z","0.0.5":"2015-11-06T17:02:59.782Z","0.0.6":"2015-11-23T23:37:13.245Z","0.0.7":"2015-11-23T23:55:34.946Z","0.0.8":"2016-01-30T00:17:05.765Z","0.0.9":"2016-02-01T20:12:30.467Z","0.1.0":"2016-05-26T18:01:04.557Z","0.1.1":"2016-06-10T01:35:24.262Z","0.1.2":"2016-10-17T20:59:25.318Z","0.2.0":"2016-10-17T21:01:16.739Z","0.2.1":"2016-10-19T02:57:57.091Z","0.2.2":"2017-09-03T03:04:16.577Z","0.3.0":"2017-09-03T03:05:29.003Z","0.3.1":"2017-09-13T19:07:18.287Z","0.3.2":"2018-01-05T22:53:16.119Z","0.3.3":"2018-03-11T01:13:40.870Z","1.0.0-alpha.0":"2018-03-16T02:55:49.707Z","0.4.0":"2018-04-27T19:34:30.608Z","0.4.1":"2018-05-16T21:41:06.613Z","0.4.2":"2018-08-28T16:54:25.774Z","0.4.3":"2019-03-13T20:48:41.671Z","0.4.4":"2019-03-14T20:45:25.003Z","0.5.0":"2019-08-05T01:27:37.095Z","0.5.1":"2019-08-05T16:22:37.005Z","0.5.2":"2019-08-31T22:22:42.667Z","0.5.3":"2019-09-19T01:42:45.880Z","0.6.0":"2019-09-19T01:43:15.749Z","0.6.1":"2019-10-24T23:18:25.121Z","0.7.0":"2019-10-24T23:28:57.011Z","0.7.1":"2019-11-04T00:20:15.944Z","0.7.2":"2019-12-30T22:00:13.513Z","0.7.3":"2021-01-08T03:23:07.505Z"},"homepage":"https://github.com/Khan/simple-markdown","keywords":["markdown","simple","react","html","ast","markup","text processing","extension","flow","typescript"],"repository":{"type":"git","url":"git+https://github.com/Khan/simple-markdown.git"},"author":{"name":"Aria Buckles"},"bugs":{"url":"https://github.com/Khan/simple-markdown/issues"},"license":"MIT","readmeFilename":"README.md","users":{"ariabuckles":true}}