stjet/Makoto-Markdown-to-HTML
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links and code blocks

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and fixes
This commit is contained in:
jetstream0
2023-06-04 23:24:23 -07:00
parent d95631179d
commit d2b2600824
3 changed files with 211 additions and 33 deletions
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211
makoto.ts
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@@ -1,9 +1,17 @@
import type { Warning } from './endosulfan';
export type ParseResult = {
html: string,
warnings: Warning[]
}
//some minor differences with markdown spec?
export function parse_md_to_html(md: string): string {
export function parse_md_to_html_with_warnings(md: string): ParseResult {
let html: string = "";
let html_line: string = "";
let warnings: Warning[] = [];
let line_number: number = 1;
//markdown parsing vars
let is_first_line: boolean = true;
@@ -19,13 +27,18 @@ export function parse_md_to_html(md: string): string {
let was_image: boolean = false;
let image_alt: string | undefined = undefined;
let image_src: string | undefined = undefined;
let was_link: boolean = false;
let link_content: string | undefined = undefined;
let link_href: string | undefined = undefined;
let in_code: boolean = false;
let in_code_block: boolean = false;
let first_line_code_block: boolean = false;
let code_block_lang: string | undefined = undefined;
//loop through characters
let chars: string = md;
for (let i=0; i < chars.length; i++) {
let char: string = chars[i];
//console.log(char, asterisk_num, in_asterisk);
//sanitize input
if (char === "<") {
char = "&lt;";
@@ -43,7 +56,7 @@ export function parse_md_to_html(md: string): string {
if (char === "\\" && chars[i+1] !== "\n") {
backslashed = true;
if (i === 0 || chars[i-1] === "\n") {
html_line += "<p>";
html_line = "<p>"+html_line;
}
continue;
}
@@ -53,6 +66,29 @@ export function parse_md_to_html(md: string): string {
//it can only be the first line once :)
is_first_line = false;
}
//if first line of code block, create the code block div
if (first_line_code_block) {
code_block_lang = code_block_lang!.toLowerCase().trim();
let known_langs: string[] = ["python", "py", "rust", "rs", "javascript", "js", "typescript", "ts", "java", "c", "cpp", "csharp", "html", "css", "markdown", "md", "brainfuck", "php", "bash", "perl", "sql", "ruby", "basic", "assembly", "asm", "wasm", "r", "go", "swift"]
if (!known_langs.includes(code_block_lang)) {
warnings.push({
type: "unknown-language",
message: `Unknown language '${code_block_lang}' for code block`,
line_number,
});
}
html_line = `<div class="code-block code-${code_block_lang}">`;
code_block_lang = undefined;
first_line_code_block = false;
}
if (in_code_block && char === "\n") {
html_line += "\n";
}
//close code block div
if (in_code_block && i === chars.length-1) {
in_code_block = false;
html_line = "</div>";
}
//if image was never completed
if (image_alt !== undefined) {
if (!html_line.startsWith("<p>")) {
@@ -61,15 +97,50 @@ export function parse_md_to_html(md: string): string {
html_line += "!["+image_alt;
if (image_src !== undefined) {
html_line += "]("+image_src;
warnings.push({
type: "image-incomplete",
message: "Image incomplete, missing `)`",
line_number,
});
} else {
warnings.push({
type: "image-incomplete",
message: "Image incomplete, missing `]` or `(`",
line_number,
});
}
image_alt = undefined;
image_src = undefined;
}
//if link was never completed
if (link_content !== undefined) {
if (!html_line.startsWith("<p>")) {
html_line = "<p>"+html_line;
}
html_line += "["+link_content;
if (link_href !== undefined) {
html_line += "]("+link_href;
warnings.push({
type: "link-incomplete",
message: "Link incomplete, missing `)`",
line_number,
});
} else {
warnings.push({
type: "link-incomplete",
message: "Link incomplete, missing `]` or `(`",
line_number,
});
}
link_content = undefined;
link_href = undefined;
}
//if last character
if (i === chars.length-1 && char !== "\n") {
let add_char: boolean = true;
//if in code
if (in_code && char === "`") {
in_code = false;
html_line += "</code>";
add_char = false;
}
@@ -78,7 +149,7 @@ export function parse_md_to_html(md: string): string {
add_char = false;
}
//handle image just ending
if (was_image && char === ")") {
if ((was_image || was_link) && char === ")") {
add_char = false;
}
//if previous character is also newline, there hasn't been opportunity to add a <p>, so add it!
@@ -109,7 +180,8 @@ export function parse_md_to_html(md: string): string {
}
html_line = "";
horizontal_num = 0;
if (horizontal_rule || was_image) {
line_number++;
if (horizontal_rule || was_image || was_link) {
if (i !== chars.length - 1 && html[html.length-1] !== "\n") {
//only add new line if there isn't already one, and isn't last character
html += "\n";
@@ -119,6 +191,7 @@ export function parse_md_to_html(md: string): string {
}
horizontal_rule = false;
was_image = false;
was_link = false;
continue;
}
//ending a header, line break not needed
@@ -139,6 +212,54 @@ export function parse_md_to_html(md: string): string {
}
continue;
}
//code blocks
if (char === "`" && chars[i+1] !== "`" && (chars.slice(i-3, i) === "\n``" || (i === 2 && chars.slice(i-2, i) === "``"))) {
if (!in_code_block) {
//make sure there is ``` further on, that is not backslashed
let skip_next: boolean = false;
let end_found: boolean = false;
for (let ii=1; ii < chars.length-i; ii++) {
let adjusted_index: number = i+ii;
if (skip_next) {
skip_next = false;
continue;
}
if (chars[adjusted_index] === "\\") {
skip_next = true;
} else if (chars.slice(adjusted_index-3, adjusted_index+1) === "\n```" && (adjusted_index === chars.length-1 || chars[adjusted_index+1] === "\n")) {
end_found = true;
break;
}
}
if (end_found) {
in_code = false;
in_code_block = true;
first_line_code_block = true;
code_block_lang = "";
//at this point html_line would have two backticks (probably a <code></code> actually) in it
html_line = "";
continue;
} else {
warnings.push({
type: "code-block-not-closed",
message: "Code block not closed, may be missing closing backticks?",
line_number,
});
}
} else if (in_code_block && chars[i+1] === "\n") { // || i === chars.length-1 will be handled by a different part
in_code = false;
in_code_block = false;
html_line = "</div>\n";
continue;
}
} else if (first_line_code_block) {
code_block_lang += char;
continue;
} else if (in_code_block) {
//do not render markdown inside code blocks... obviously
html_line += char;
continue;
}
//handle code
if (char === "`" && !in_code) {
//make sure there is another ` in the line
@@ -162,9 +283,20 @@ export function parse_md_to_html(md: string): string {
if (end_found) {
in_code = true;
html_line += "<code>";
//we have to repeat some code from later on and add a <p>
if (i === 0 || chars[i-1] === "\n") {
html_line = "<p>"+html_line;
}
continue;
} else {
warnings.push({
type: "code-snippet-not-closed",
message: "Code snippet not closed, may be missing closing backtick?",
line_number,
});
}
} else if (char === "`" && in_code) {
in_code = false;
html_line += "</code>";
continue;
} else if (in_code) {
@@ -179,12 +311,18 @@ export function parse_md_to_html(md: string): string {
continue;
} else if (heading_level > 0 && char === " " && !in_heading) {
in_heading = true;
html_line += `<h${heading_level} id='header-${header_num}'>`;
html_line += `<h${heading_level} id="header-${header_num}">`;
header_num++;
continue;
} else if (heading_level > 0) {
html_line += "<p>"+"#".repeat(heading_level);
//not a heading
html_line = "<p>"+"#".repeat(heading_level);
heading_level = 0;
warnings.push({
type: "heading-broken",
message: "Missing space after `#` for heading?",
line_number,
});
}
}
//handle horizontal rules
@@ -203,17 +341,22 @@ export function parse_md_to_html(md: string): string {
} else if (horizontal_num > 0) {
//no longer a horizontal line
html_line = "<p>"+"-".repeat(horizontal_num);
warnings.push({
type: "horizontal-rule-broken",
message: "Horizontal rule broken",
line_number,
});
}
}
//handle images
if (char === "!" && chars[i+1] === "[") {
continue;
} else if (char === "]" && chars[i+1] === "(" && image_alt !== undefined) {
} else if (char === "]" && chars[i+1] === "(" && image_alt !== undefined && image_src === undefined) {
continue;
} else if (char === "[" && chars[i-1] === "!" && image_alt === undefined && image_src === undefined) {
image_alt = "";
continue;
} else if (char === "(" && chars[i-1] === "]" && image_alt !== undefined) {
} else if (char === "(" && chars[i-1] === "]" && image_alt !== undefined && image_src === undefined) {
image_src = "";
continue;
} else if ((char === ")" || (chars[i+1] === ")" && i+1 === chars.length-1)) && image_src !== undefined) {
@@ -231,12 +374,46 @@ export function parse_md_to_html(md: string): string {
} else if (image_src !== undefined) {
image_src += char;
continue;
} else {
} else if (was_image) {
was_image = false;
}
//handle links
if (char === "[") {
link_content = "";
continue;
} else if (char === "]" && chars[i+1] === "(" && link_content !== undefined && link_href === undefined) {
continue;
} else if (char === "(" && chars[i-1] === "]" && link_content !== undefined && link_href === undefined) {
link_href = "";
continue;
} else if ((char === ")" || (chars[i+1] === ")" && i+1 === chars.length-1)) && link_href !== undefined && link_content !== undefined) {
let before_link: number;
if (chars[i+1] === ")" && i+1 === chars.length-1) {
link_href += char;
before_link = i-link_href.length-link_content.length-3;
} else {
before_link = i-link_href.length-link_content.length-4;
}
if (chars[before_link] === "\n" || before_link === -1) {
html_line = "<p>";
}
html_line += `<a href="${link_href}">${link_content}</a>`;
was_link = true;
link_content = undefined;
link_href = undefined;
continue;
} else if (link_content !== undefined && link_href === undefined) {
link_content += char;
continue;
} else if (link_href !== undefined) {
link_href += char;
continue;
} else if (was_link) {
was_link = false;
}
//add beginning paragraph
if (i === 0 || chars[i-1] === "\n") {
html_line += "<p>";
html_line = "<p>"+html_line;
}
//handle italics and bolds
if (char === "*" && asterisk_num < 2 && !in_asterisk) {
@@ -272,12 +449,12 @@ export function parse_md_to_html(md: string): string {
html_line += char;
}
return html;
return {
html,
warnings,
};
}
//WarningFunction to generate warnings and catch possible mistakes (eg: link not completed or possible space missing after #)
export function find_warnings(md: string): Warning[] {
let warnings: Warning[] = [];
//
return warnings;
export function parse_md_to_html(md: string): string {
return parse_md_to_html_with_warnings(md).html;
}