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smd.js
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smd.js
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/*
Streaming Markdown Parser and Renderer
MIT License
Copyright 2024 Damian Tarnawski
https://github.com/thetarnav/streaming-markdown
*/
export const
DOCUMENT = 1, // 1
PARAGRAPH = 2, // 2
HEADING_1 = 4, // 3
HEADING_2 = 8, // 4
HEADING_3 = 16, // 5
HEADING_4 = 32, // 6
HEADING_5 = 64, // 7
HEADING_6 = 128, // 8
CODE_BLOCK = 256, // 9
CODE_FENCE = 512, // 10
CODE_INLINE = 1024, // 11
ITALIC_AST = 2048, // 12
ITALIC_UND = 4096, // 13
STRONG_AST = 8192, // 14
STRONG_UND = 16384, // 15
STRIKE = 32768, // 16
LINK = 65536, // 17
RAW_URL = 131072, // 18
IMAGE = 262144, // 19
BLOCKQUOTE = 524288, // 20
LINE_BREAK = 1048576, // 21
RULE = 4194304, // 22
LIST_UNORDERED = 8388608, // 23
LIST_ORDERED = 16777216, // 24
LIST_ITEM = 33554432, // 25
CHECKBOX = 67108864, // 26
MAYBE_URL =134217728, // 27
MAYBE_TASK =268435456, // 28
/** `HEADING_1 | HEADING_2 | HEADING_3 | HEADING_4 | HEADING_5 | HEADING_6` */
ANY_HEADING = 252,
/** `CODE_BLOCK | CODE_FENCE | CODE_INLINE` */
ANY_CODE = 1792,
/** `ITALIC_AST | ITALIC_UND` */
ANY_ITALIC = 6144,
/** `STRONG_AST | STRONG_UND` */
ANY_STRONG = 24576,
/** `STRONG_AST | ITALIC_AST` */
ANY_AST = 10240,
/** `STRONG_UND | ITALIC_UND` */
ANY_UND = 20480,
/** `LIST_UNORDERED | LIST_ORDERED` */
ANY_LIST = 25165824,
/** `DOCUMENT | BLOCKQUOTE` */
ANY_ROOT = 262145
/** @enum {(typeof Token)[keyof typeof Token]} */
export const Token = /** @type {const} */({
Document: DOCUMENT,
Blockquote: BLOCKQUOTE,
Paragraph: PARAGRAPH,
Heading_1: HEADING_1,
Heading_2: HEADING_2,
Heading_3: HEADING_3,
Heading_4: HEADING_4,
Heading_5: HEADING_5,
Heading_6: HEADING_6,
Code_Block: CODE_BLOCK,
Code_Fence: CODE_FENCE,
Code_Inline: CODE_INLINE,
Italic_Ast: ITALIC_AST,
Italic_Und: ITALIC_UND,
Strong_Ast: STRONG_AST,
Strong_Und: STRONG_UND,
Strike: STRIKE,
Link: LINK,
Raw_URL: RAW_URL,
Image: IMAGE,
Line_Break: LINE_BREAK,
Rule: RULE,
List_Unordered: LIST_UNORDERED,
List_Ordered: LIST_ORDERED,
List_Item: LIST_ITEM,
Checkbox: CHECKBOX,
})
/**
* @param {Token} type
* @returns {string } */
export function token_to_string(type) {
switch (type) {
case DOCUMENT: return "Document"
case BLOCKQUOTE: return "Blockquote"
case PARAGRAPH: return "Paragraph"
case HEADING_1: return "Heading_1"
case HEADING_2: return "Heading_2"
case HEADING_3: return "Heading_3"
case HEADING_4: return "Heading_4"
case HEADING_5: return "Heading_5"
case HEADING_6: return "Heading_6"
case CODE_BLOCK: return "Code_Block"
case CODE_FENCE: return "Code_Fence"
case CODE_INLINE: return "Code_Inline"
case ITALIC_AST: return "Italic_Ast"
case ITALIC_UND: return "Italic_Und"
case STRONG_AST: return "Strong_Ast"
case STRONG_UND: return "Strong_Und"
case STRIKE: return "Strike"
case LINK: return "Link"
case RAW_URL: return "Raw URL"
case IMAGE: return "Image"
case LINE_BREAK: return "Line_Break"
case RULE: return "Rule"
case LIST_UNORDERED: return "List_Unordered"
case LIST_ORDERED: return "List_Ordered"
case LIST_ITEM: return "List_Item"
case CHECKBOX: return "Checkbox"
}
}
export const
HREF = 1,
SRC = 2,
LANG = 4,
CHECKED = 8,
START = 16
/** @enum {(typeof Attr)[keyof typeof Attr]} */
export const Attr = /** @type {const} */({
Href : HREF,
Src : SRC,
Lang : LANG,
Checked: CHECKED,
Start : START,
})
/**
* @param {Attr} type
* @returns {string } */
export function attr_to_html_attr(type) {
switch (type) {
case HREF: return "href"
case SRC : return "src"
case LANG: return "class"
case CHECKED: return "checked"
case START: return "start"
}
}
/**
* @typedef {object } Parser
* @property {Any_Renderer} renderer - {@link Renderer} interface
* @property {string } text - Text to be added to the last token in the next flush
* @property {string } pending - Characters for identifying tokens
* @property {Uint32Array } tokens - Current token and it's parents (a slice of a tree)
* @property {number } len - Number of tokens in types without root
* @property {number } token - Last token in the tree
* @property {Uint8Array } spaces
* @property {string } indent
* @property {number } indent_len
* @property {0 | 1 } code_fence_body - For {@link Token.Code_Fence} parsing
* @property {number } backticks_count
* @property {number } blockquote_idx - For Blockquote parsing
* @property {string } hr_char - For horizontal rule parsing
* @property {number } hr_chars - For horizontal rule parsing
*/
const TOKEN_ARRAY_CAP = 24
/**
* Makes a new Parser object.
* @param {Any_Renderer} renderer
* @returns {Parser } */
export function parser(renderer) {
const tokens = new Uint32Array(TOKEN_ARRAY_CAP)
tokens[0] = DOCUMENT
return {
renderer : renderer,
text : "",
pending : "",
tokens : tokens,
len : 0,
token : DOCUMENT,
code_fence_body: 0,
blockquote_idx: 0,
hr_char : '',
hr_chars : 0,
backticks_count: 0,
spaces : new Uint8Array(TOKEN_ARRAY_CAP),
indent : "",
indent_len: 0,
}
}
/**
* Finish rendering the markdown - flushes any remaining text.
* @param {Parser} p
* @returns {void } */
export function parser_end(p) {
if (p.pending.length > 0) {
parser_write(p, "\n")
}
}
/**
* @param {Parser} p
* @returns {void } */
function add_text(p) {
if (p.text.length === 0) return
console.assert(p.len > 0, "Never adding text to root")
p.renderer.add_text(p.renderer.data, p.text)
p.text = ""
}
/**
* @param {Parser} p
* @returns {void } */
function end_token(p) {
console.assert(p.len > 0, "No nodes to end")
p.len -= 1
p.token = /** @type {Token} */ (p.tokens[p.len])
p.renderer.end_token(p.renderer.data)
}
/**
* @param {Parser} p
* @param {Token } token
* @returns {void } */
function add_token(p, token) {
/*
If a list doesn't start with a list item
it means that there was a newline after the list:
1. foo
2. bar
<empty line>
<not_a_list_item> <- new token
*/
if (p.tokens[p.len] & ANY_LIST && !(token & LIST_ITEM)) {
end_token(p)
}
p.len += 1
p.tokens[p.len] = token
p.token = token
p.renderer.add_token(p.renderer.data, token)
}
/**
* @param {Parser} p
* @param {number} token
* @param {number} start_idx
* @returns {number} */
function idx_of_token(p, token, start_idx) {
while (start_idx <= p.len) {
if (p.tokens[start_idx] & token) {
return start_idx
}
start_idx += 1
}
return -1
}
/**
* End tokens until the parser has the given length.
* @param {Parser} p
* @param {number} len
* @returns {void } */
function end_tokens_to_len(p, len) {
while (p.len > len) {
end_token(p)
}
}
/**
* @param {Parser } p
* @param {Token } list_token
* @returns {boolean} added a new list */
function continue_or_add_list(p, list_token) {
/* will create a new list inside the last item
if the amount of spaces is greater than the last one (with prefix)
1. foo
- bar <- new nested ul
- baz <- new nested ul
12. qux <- cannot be nested in "baz" or "bar",
so it's a new list in "foo"
*/
let list_idx = -1
let item_idx = -1
for (let i = p.blockquote_idx+1; i <= p.len; i += 1) {
if (p.tokens[i] & LIST_ITEM) {
if (p.indent_len < p.spaces[i]) {
item_idx = -1
break
}
item_idx = i
} else if (p.tokens[i] & list_token) {
list_idx = i
}
}
if (item_idx === -1) {
if (list_idx === -1) {
end_tokens_to_len(p, p.blockquote_idx)
add_token(p, list_token)
return true
}
end_tokens_to_len(p, list_idx)
return false
}
end_tokens_to_len(p, item_idx)
add_token(p, list_token)
return true
}
/**
* Create a new list
* or continue the last one
* @param {Parser } p
* @param {number } prefix_length
* @returns {void } */
function add_list_item(p, prefix_length) {
add_token(p, LIST_ITEM)
p.spaces[p.len] = p.indent_len + prefix_length
clear_root_pending(p)
p.token = MAYBE_TASK
}
/**
* @param {Parser} p
* @returns {void } */
function clear_root_pending(p) {
p.indent = ""
p.indent_len = 0
p.pending = ""
}
/**
* @param {number} charcode
* @returns {boolean} */
function is_digit(charcode) {
switch (charcode) {
case 48: case 49: case 50: case 51: case 52:
case 53: case 54: case 55: case 56: case 57:
return true
default:
return false
}
}
/**
* Parse and render another chunk of markdown.
* @param {Parser} p
* @param {string} chunk
* @returns {void } */
export function parser_write(p, chunk) {
for (const char of chunk) {
const pending_with_char = p.pending + char
/*
Token specific checks
*/
switch (p.token) {
case LINE_BREAK:
case DOCUMENT:
case BLOCKQUOTE:
case LIST_ORDERED:
case LIST_UNORDERED:
console.assert(p.text.length === 0, "Root should not have any text")
switch (p.pending[0]) {
case undefined:
p.pending = char
continue
case ' ':
console.assert(p.pending.length === 1)
p.pending = char
p.indent += ' '
p.indent_len += 1
continue
case '\t':
console.assert(p.pending.length === 1)
p.pending = char
p.indent += '\t'
p.indent_len += 4
continue
case '\n':
console.assert(p.pending.length === 1)
/*
Lists can have an empty line in between items:
1. foo
<empty>
2. bar
*/
if (p.tokens[p.len] & LIST_ITEM && p.token & LINE_BREAK) {
end_token(p)
p.pending = char
continue
}
/*
Exit out of tokens
And ignore newlines in root
*/
end_tokens_to_len(p, p.blockquote_idx)
p.blockquote_idx = 0
p.backticks_count = 0
p.pending = char
continue
/* Heading */
case '#':
switch (char) {
case '#':
if (p.pending.length < 6) {
p.pending = pending_with_char
continue
}
break // fail
case ' ':
switch (p.pending.length) {
case 1: add_token(p, HEADING_1); clear_root_pending(p); continue
case 2: add_token(p, HEADING_2); clear_root_pending(p); continue
case 3: add_token(p, HEADING_3); clear_root_pending(p); continue
case 4: add_token(p, HEADING_4); clear_root_pending(p); continue
case 5: add_token(p, HEADING_5); clear_root_pending(p); continue
case 6: add_token(p, HEADING_6); clear_root_pending(p); continue
}
console.assert(false, "Should not reach here")
}
break // fail
/* Blockquote */
case '>': {
const next_blockquote_idx = idx_of_token(p, BLOCKQUOTE, p.blockquote_idx+1)
/*
Only when there is no blockquote to the right of blockquote_idx
a new blockquote can be created
*/
if (next_blockquote_idx === -1) {
end_tokens_to_len(p, p.blockquote_idx)
p.blockquote_idx += 1
p.backticks_count = 0
add_token(p, BLOCKQUOTE)
} else {
p.blockquote_idx = next_blockquote_idx
}
clear_root_pending(p)
p.pending = char
continue
}
/* Horizontal Rule
"-- - --- - --"
*/
case '-':
case '*':
case '_':
if (p.hr_chars === 0) {
console.assert(p.pending.length === 1, "Pending should be one character")
p.hr_chars = 1
p.hr_char = p.pending
}
if (p.hr_chars > 0) {
switch (char) {
case p.hr_char:
p.hr_chars += 1
p.pending = pending_with_char
continue
case ' ':
p.pending = pending_with_char
continue
case '\n':
if (p.hr_chars < 3) break
p.renderer.add_token(p.renderer.data, RULE)
p.renderer.end_token(p.renderer.data)
p.pending = ""
p.hr_chars = 0
continue
}
p.hr_chars = 0
}
/* Unordered list
/ * foo
/ * *bar*
/ * **baz**
/*/
if ('_' !== p.pending[0] &&
' ' === p.pending[1]
) {
continue_or_add_list(p, LIST_UNORDERED)
add_list_item(p, 2)
parser_write(p, pending_with_char.slice(2))
continue
}
break // fail
/* Code Fence */
case '`':
/* ``?
^
*/
if (p.pending.length < 3) {
if ('`' === char) {
p.pending = pending_with_char
p.backticks_count = pending_with_char.length
continue
}
p.backticks_count = 0
break // fail
}
switch (char) {
case '`':
/* ````?
^
*/
if (p.pending.length === p.backticks_count) {
p.pending = pending_with_char
p.backticks_count = pending_with_char.length
}
/* ```code`
^
*/
else {
add_token(p, PARAGRAPH)
clear_root_pending(p)
p.backticks_count = 0
parser_write(p, pending_with_char)
}
continue
case '\n':
/* ```lang\n
^
*/
add_token(p, CODE_FENCE)
if (p.pending.length > p.backticks_count) {
p.renderer.set_attr(p.renderer.data, LANG, p.pending.slice(p.backticks_count))
}
clear_root_pending(p)
continue
default:
/* ```lang\n
^
*/
p.pending = pending_with_char
continue
}
/*
List Unordered for '+'
The other list types are handled with HORIZONTAL_RULE
*/
case '+':
if (' ' !== char) break // fail
continue_or_add_list(p, LIST_UNORDERED)
add_list_item(p, 2)
continue
/* List Ordered */
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
/*
12. foo
^
*/
if ('.' === p.pending[p.pending.length-1]) {
if (' ' !== char) break // fail
if (continue_or_add_list(p, LIST_ORDERED) && p.pending !== "1.") {
p.renderer.set_attr(p.renderer.data, START, p.pending.slice(0, -1))
}
add_list_item(p, p.pending.length+1)
continue
} else {
const char_code = char.charCodeAt(0)
if (46 === char_code || // '.'
is_digit(char_code) // 0-9
) {
p.pending = pending_with_char
continue
}
}
break // fail
}
let to_write = pending_with_char
/* Add line break */
if (p.token & LINE_BREAK) {
/* Add a line break and continue in previous token */
p.token = p.tokens[p.len]
p.renderer.add_token(p.renderer.data, LINE_BREAK)
p.renderer.end_token(p.renderer.data)
}
/* Code Block */
else if (p.indent_len >= 4) {
/*
Case where there are additional spaces
after the indent that makes the code block
_________________________
code
^^^^----indent
^^^-part of code
_________________________
\t code
^^-----indent
^^^-part of code
*/
let code_start = 0
for (; code_start < 4; code_start += 1) {
if (p.indent[code_start] === '\t') {
code_start = code_start+1
break
}
}
to_write = p.indent.slice(code_start) + pending_with_char
add_token(p, CODE_BLOCK)
}
/* Paragraph */
else {
add_token(p, PARAGRAPH)
}
clear_root_pending(p)
parser_write(p, to_write)
continue
case CODE_BLOCK:
switch (pending_with_char) {
case "\n ":
case "\n \t":
case "\n \t":
case "\n \t":
case "\n\t":
p.text += "\n"
p.pending = ""
continue
case "\n":
case "\n ":
case "\n ":
case "\n ":
p.pending = pending_with_char
continue
default:
if (p.pending.length !== 0) {
add_text(p)
end_token(p)
p.pending = char
} else {
p.text += char
}
continue
}
case CODE_FENCE:
switch (char) {
case '`':
if (pending_with_char.length ===
p.backticks_count + p.code_fence_body // 0 or 1 for \n
) {
add_text(p)
end_token(p)
p.pending = ""
p.backticks_count = 0
p.code_fence_body = 0
} else {
p.pending = pending_with_char
}
continue
case '\n':
p.text += p.pending
p.pending = char
p.code_fence_body = 1
continue
default:
p.text += pending_with_char
p.pending = ""
p.code_fence_body = 1
continue
}
case CODE_INLINE:
switch (char) {
case '`':
if (pending_with_char.length ===
p.backticks_count + Number(p.pending[0] === ' ') // 0 or 1 for space
) {
add_text(p)
end_token(p)
p.pending = ""
p.backticks_count = 0
} else {
p.pending = pending_with_char
}
continue
case '\n':
p.text += p.pending
p.pending = ""
p.token = LINE_BREAK
p.blockquote_idx = 0
add_text(p)
continue
/* Trim space before ` */
case ' ':
p.text += p.pending
p.pending = char
continue
default:
p.text += pending_with_char
p.pending = ""
continue
}
/* Checkboxes */
case MAYBE_TASK:
switch (p.pending.length) {
case 0:
if ('[' !== char) break // fail
p.pending = pending_with_char
continue
case 1:
if (' ' !== char && 'x' !== char) break // fail
p.pending = pending_with_char
continue
case 2:
if (']' !== char) break // fail
p.pending = pending_with_char
continue
case 3:
if (' ' !== char) break // fail
p.renderer.add_token(p.renderer.data, CHECKBOX)
if ('x' === p.pending[1]) {
p.renderer.set_attr(p.renderer.data, CHECKED, "")
}
p.renderer.end_token(p.renderer.data)
p.pending = " "
continue
}
p.token = p.tokens[p.len]
p.pending = ""
parser_write(p, pending_with_char)
continue
case STRONG_AST:
case STRONG_UND: {
/** @type {string} */ let symbol = '*'
/** @type {Token } */ let italic = ITALIC_AST
if (p.token === STRONG_UND) {
symbol = '_'
italic = ITALIC_UND
}
if (symbol === p.pending) {
add_text(p)
/* **Bold**
^
*/
if (symbol === char) {
end_token(p)
p.pending = ""
continue
}
/* **Bold*Bold->Em*
^
*/
add_token(p, italic)
p.pending = char
continue
}
break
}
case ITALIC_AST:
case ITALIC_UND: {
/** @type {string} */ let symbol = '*'
/** @type {Token } */ let strong = STRONG_AST
if (p.token === ITALIC_UND) {
symbol = '_'
strong = STRONG_UND
}
switch (p.pending) {
case symbol:
if (symbol === char) {
/* Decide between ***bold>em**em* and **bold*bold>em***
^ ^
With the help of the next character
*/
if (p.tokens[p.len-1] === strong) {
p.pending = pending_with_char
}
/* *em**bold
^
*/
else {
add_text(p)
add_token(p, strong)
p.pending = ""
}
}
/* *em*foo
^
*/
else {
add_text(p)
end_token(p)
p.pending = char
}
continue
case symbol+symbol:
const italic = p.token
add_text(p)
end_token(p)
end_token(p)
/* ***bold>em**em* or **bold*bold>em***
^ ^
*/
if (symbol !== char) {
add_token(p, italic)
p.pending = char
} else {
p.pending = ""
}
continue
}
break
}
case STRIKE:
if ("~~" === pending_with_char) {
add_text(p)
end_token(p)
p.pending = ""
continue
}
break
/* Raw URLs */
case MAYBE_URL:
if ("http://" === pending_with_char ||
"https://" === pending_with_char
) {
add_text(p)
add_token(p, RAW_URL)
p.pending = pending_with_char
p.text = pending_with_char
}
else
if ("http:/" [p.pending.length] === char ||
"https:/"[p.pending.length] === char
) {
p.pending = pending_with_char
}
else {
p.token = p.tokens[p.len]
parser_write(p, char)
}
continue
case LINK:
case IMAGE:
if ("]" === p.pending) {
/*
[Link](url)
^
*/
add_text(p)
if ('(' === char) {
p.pending = pending_with_char
} else {
end_token(p)
p.pending = char
}
continue
}
if (']' === p.pending[0] &&
'(' === p.pending[1]
) {
/*
[Link](url)
^
*/
if (')' === char) {
const type = p.token === LINK ? HREF : SRC
const url = p.pending.slice(2)
p.renderer.set_attr(p.renderer.data, type, url)
end_token(p)
p.pending = ""
} else {
p.pending += char
}
continue
}
break
case RAW_URL:
/* http://example.com?
^
*/
if (' ' === char ||
'\n'=== char ||
'\\'=== char
) {
p.renderer.set_attr(p.renderer.data, HREF, p.pending)
add_text(p)
end_token(p)
p.pending = char
} else {
p.text += char
p.pending = pending_with_char
}
continue
}
/*
Common checks
*/
switch (p.pending[0]) {
/* Escape character */
case '\\':
if ('\n' === char) {
// Escaped newline has the same affect as unescaped one
p.pending = char
} else {
const char_code = char.charCodeAt(0)
p.pending = ""
p.text += is_digit(char_code) || // 0-9
(char_code >= 65 && char_code <= 90) || // A-Z
(char_code >= 97 && char_code <= 122) // a-z
? pending_with_char
: char
}
continue
/* Newline */
case '\n':
add_text(p)
p.token = LINE_BREAK
p.blockquote_idx = 0
p.pending = char
continue
/* `Code Inline` */
case '`':
if (p.token & IMAGE) break
if ('`' === char) {
p.backticks_count += 1
p.pending = pending_with_char
} else {
p.backticks_count += 1 // started at 0, and first wasn't counted
add_text(p)
add_token(p, CODE_INLINE)
p.text = ' ' === char || '\n' === char ? "" : char // trim leading space
p.pending = ""
}
continue
case '_':
case '*': {
if (p.token & IMAGE) break
/** @type {Token} */ let italic = ITALIC_AST
/** @type {Token} */ let strong = STRONG_AST
const symbol = p.pending[0]
if ('_' === symbol) {
italic = ITALIC_UND
strong = STRONG_UND
}
if (p.pending.length === 1) {
/* **Strong**
^
*/
if (symbol === char) {
p.pending = pending_with_char
continue
}
/* *Em*
^
*/
if (' ' !== char && '\n' !== char) {
add_text(p)
add_token(p, italic)
p.pending = char
continue
}
} else {
/* ***Strong->Em***
^
*/
if (symbol === char) {
add_text(p)
add_token(p, strong)
add_token(p, italic)
p.pending = ""
continue
}
/* **Strong**
^
*/
if (' ' !== char && '\n' !== char) {
add_text(p)
add_token(p, strong)
p.pending = char
continue
}
}
break
}
case '~':