discourse/app/assets/javascripts/pretty-text/engines/discourse-markdown/paragraph.js.es6

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// see: https://github.com/markdown-it/markdown-it/issues/375
//
// we use a custom paragraph rule cause we have to signal when a
// link starts with a space, so we can bypass a onebox
// this is a freedom patch, so careful, may break on updates
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function paragraph(state, startLine /*, endLine*/) {
var content,
terminate,
i,
l,
token,
oldParentType,
nextLine = startLine + 1,
terminatorRules = state.md.block.ruler.getRules("paragraph"),
endLine = state.lineMax,
hasLeadingSpace = false;
oldParentType = state.parentType;
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state.parentType = "paragraph";
// jump line-by-line until empty one or EOF
for (; nextLine < endLine && !state.isEmpty(nextLine); nextLine++) {
// this would be a code block normally, but after paragraph
// it's considered a lazy continuation regardless of what's there
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if (state.sCount[nextLine] - state.blkIndent > 3) {
continue;
}
// quirk for blockquotes, this line should already be checked by that rule
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if (state.sCount[nextLine] < 0) {
continue;
}
// Some tags can terminate paragraph without empty line.
terminate = false;
for (i = 0, l = terminatorRules.length; i < l; i++) {
if (terminatorRules[i](state, nextLine, endLine, true)) {
terminate = true;
break;
}
}
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if (terminate) {
break;
}
}
// START CUSTOM CODE
content = state.getLines(startLine, nextLine, state.blkIndent, false);
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i = 0;
let contentLength = content.length;
while (i < contentLength) {
let chr = content.charCodeAt(i);
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if (chr === 0x0a) {
hasLeadingSpace = false;
} else if (state.md.utils.isWhiteSpace(chr)) {
hasLeadingSpace = true;
} else {
break;
}
i++;
}
content = content.trim();
// END CUSTOM CODE
state.line = nextLine;
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token = state.push("paragraph_open", "p", 1);
token.map = [startLine, state.line];
// CUSTOM
token.leading_space = hasLeadingSpace;
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token = state.push("inline", "", 0);
token.content = content;
token.map = [startLine, state.line];
token.children = [];
// CUSTOM
token.leading_space = hasLeadingSpace;
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token = state.push("paragraph_close", "p", -1);
state.parentType = oldParentType;
return true;
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}
export function setup(helper) {
helper.registerPlugin(md => {
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md.block.ruler.at("paragraph", paragraph);
});
}