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Code Issues Releases Wiki Activity

Apply strictNullChecks to Markdown.ts (#10623) 

Co-authored-by: Kerry <kerrya@element.io>
t3chguy/dedup-icons-17oct
Timothy Amello 2023-04-17 03:41:51 -04:00 committed by GitHub
parent 4c0efc5e68
commit 1d9df7ec51
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1 changed files with 26 additions and 18 deletions
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44
src/Markdown.ts
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@ -28,7 +28,11 @@ const ALLOWED_HTML_TAGS = ["sub", "sup", "del", "u"];
const TEXT_NODES = ["text", "softbreak", "linebreak", "paragraph", "document"];
function isAllowedHtmlTag(node: commonmark.Node): boolean {
if (node.literal != null && node.literal.match('^<((div|span) data-mx-maths="[^"]*"|/(div|span))>$') != null) {
if (!node.literal) {
return false;
}
if (node.literal.match('^<((div|span) data-mx-maths="[^"]*"|/(div|span))>$') != null) {
return true;
}
@ -57,9 +61,9 @@ function isMultiLine(node: commonmark.Node): boolean {
}
function getTextUntilEndOrLinebreak(node: commonmark.Node): string {
let currentNode = node;
let currentNode: commonmark.Node | null = node;
let text = "";
while (currentNode !== null && currentNode.type !== "softbreak" && currentNode.type !== "linebreak") {
while (currentNode && currentNode.type !== "softbreak" && currentNode.type !== "linebreak") {
const { literal, type } = currentNode;
if (type === "text" && literal) {
let n = 0;
@ -95,7 +99,7 @@ const innerNodeLiteral = (node: commonmark.Node): string => {
let literal = "";
const walker = node.walker();
let step: commonmark.NodeWalkingStep;
let step: commonmark.NodeWalkingStep | null;
while ((step = walker.next())) {
const currentNode = step.node;
@ -166,7 +170,7 @@ export default class Markdown {
}
// Break up text nodes on spaces, so that we don't shoot past them without resetting
if (node.type === "text") {
if (node.type === "text" && node.literal) {
const [thisPart, ...nextParts] = node.literal.split(/( )/);
node.literal = thisPart;
text += thisPart;
@ -184,11 +188,11 @@ export default class Markdown {
}
// We should not do this if previous node was not a textnode, as we can't combine it then.
if ((node.type === "emph" || node.type === "strong") && previousNode.type === "text") {
if ((node.type === "emph" || node.type === "strong") && previousNode?.type === "text") {
if (event.entering) {
const foundLinks = linkify.find(text);
for (const { value } of foundLinks) {
if (node.firstChild.literal) {
if (node?.firstChild?.literal) {
/**
* NOTE: This technically should unlink the emph node and create LINK nodes instead, adding all the next elements as siblings
* but this solution seems to work well and is hopefully slightly easier to understand too
@ -205,10 +209,12 @@ export default class Markdown {
previousNode.insertAfter(emphasisTextNode);
node.firstChild.literal = "";
event = node.walker().next();
// Remove `em` opening and closing nodes
node.unlink();
previousNode.insertAfter(event.node);
shouldUnlinkFormattingNode = true;
if (event) {
// Remove `em` opening and closing nodes
node.unlink();
previousNode.insertAfter(event.node);
shouldUnlinkFormattingNode = true;
}
} else {
logger.error(
"Markdown links escaping found too many links for following text: ",
@ -237,7 +243,7 @@ export default class Markdown {
public isPlainText(): boolean {
const walker = this.parsed.walker();
let ev: commonmark.NodeWalkingStep;
let ev: commonmark.NodeWalkingStep | null;
while ((ev = walker.next())) {
const node = ev.node;
if (TEXT_NODES.indexOf(node.type) > -1) {
@ -294,7 +300,7 @@ export default class Markdown {
renderer.link = function (node, entering) {
const attrs = this.attrs(node);
if (entering) {
if (entering && node.destination) {
attrs.push(["href", this.esc(node.destination)]);
if (node.title) {
attrs.push(["title", this.esc(node.title)]);
@ -312,10 +318,12 @@ export default class Markdown {
};
renderer.html_inline = function (node: commonmark.Node) {
if (isAllowedHtmlTag(node)) {
this.lit(node.literal);
} else {
this.lit(escape(node.literal));
if (node.literal) {
if (isAllowedHtmlTag(node)) {
this.lit(node.literal);
} else {
this.lit(escape(node.literal));
}
}
};
@ -358,7 +366,7 @@ export default class Markdown {
};
renderer.html_block = function (node: commonmark.Node) {
this.lit(node.literal);
if (node.literal) this.lit(node.literal);
if (isMultiLine(node) && node.next) this.lit("\n\n");
};