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// Emojies & shortcuts replacement logic.
//
// Note: In theory, it could be faster to parse :smile: in inline chain and
// leave only shortcuts here. But, who care...
//
'use strict';
module.exports = function create_rule(md, emojies, shortcuts, scanRE, replaceRE) {
var arrayReplaceAt = md.utils.arrayReplaceAt,
ucm = md.utils.lib.ucmicro,
ZPCc = new RegExp([ ucm.Z.source, ucm.P.source, ucm.Cc.source ].join('|'));
function splitTextToken(text, level, Token) {
var token, last_pos = 0, nodes = [];
text.replace(replaceRE, function (match, offset, src) {
var emoji_name;
// Validate emoji name
if (shortcuts.hasOwnProperty(match)) {
// replace shortcut with full name
emoji_name = shortcuts[match];
// Don't allow letters before any shortcut (as in no ":/" in http://)
if (offset > 0 && !ZPCc.test(src[offset - 1])) {
return;
}
// Don't allow letters after any shortcut
if (offset + match.length < src.length && !ZPCc.test(src[offset + match.length])) {
return;
}
} else {
emoji_name = match.slice(1, -1);
}
// Add new tokens to pending list
if (offset > last_pos) {
token = new Token('text', '', 0);
token.content = text.slice(last_pos, offset);
nodes.push(token);
}
token = new Token('emoji', '', 0);
token.markup = emoji_name;
token.content = emojies[emoji_name];
nodes.push(token);
last_pos = offset + match.length;
});
if (last_pos < text.length) {
token = new Token('text', '', 0);
token.content = text.slice(last_pos);
nodes.push(token);
}
return nodes;
}
return function emoji_replace(state) {
var i, j, l, tokens, token,
blockTokens = state.tokens,
autolinkLevel = 0;
for (j = 0, l = blockTokens.length; j < l; j++) {
if (blockTokens[j].type !== 'inline') { continue; }
tokens = blockTokens[j].children;
// We scan from the end, to keep position when new tags added.
// Use reversed logic in links start/end match
for (i = tokens.length - 1; i >= 0; i--) {
token = tokens[i];
if (token.type === 'link_open' || token.type === 'link_close') {
if (token.info === 'auto') { autolinkLevel -= token.nesting; }
}
if (token.type === 'text' && autolinkLevel === 0 && scanRE.test(token.content)) {
// replace current node
blockTokens[j].children = tokens = arrayReplaceAt(
tokens, i, splitTextToken(token.content, token.level, state.Token)
);
}
}
}
};
};
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