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// ~~strike through~~
//
'use strict';
// Insert each marker as a separate text token, and add it to delimiter list
//
module.exports.tokenize = function strikethrough(state, silent) {
var i, scanned, token, len, ch,
start = state.pos,
marker = state.src.charCodeAt(start);
if (silent) { return false; }
if (marker !== 0x7E/* ~ */) { return false; }
scanned = state.scanDelims(state.pos, true);
len = scanned.length;
ch = String.fromCharCode(marker);
if (len < 2) { return false; }
if (len % 2) {
token = state.push('text', '', 0);
token.content = ch;
len--;
}
for (i = 0; i < len; i += 2) {
token = state.push('text', '', 0);
token.content = ch + ch;
state.delimiters.push({
marker: marker,
length: 0, // disable "rule of 3" length checks meant for emphasis
token: state.tokens.length - 1,
end: -1,
open: scanned.can_open,
close: scanned.can_close
});
}
state.pos += scanned.length;
return true;
};
function postProcess(state, delimiters) {
var i, j,
startDelim,
endDelim,
token,
loneMarkers = [],
max = delimiters.length;
for (i = 0; i < max; i++) {
startDelim = delimiters[i];
if (startDelim.marker !== 0x7E/* ~ */) {
continue;
}
if (startDelim.end === -1) {
continue;
}
endDelim = delimiters[startDelim.end];
token = state.tokens[startDelim.token];
token.type = 's_open';
token.tag = 's';
token.nesting = 1;
token.markup = '~~';
token.content = '';
token = state.tokens[endDelim.token];
token.type = 's_close';
token.tag = 's';
token.nesting = -1;
token.markup = '~~';
token.content = '';
if (state.tokens[endDelim.token - 1].type === 'text' &&
state.tokens[endDelim.token - 1].content === '~') {
loneMarkers.push(endDelim.token - 1);
}
}
// If a marker sequence has an odd number of characters, it's splitted
// like this: `~~~~~` -> `~` + `~~` + `~~`, leaving one marker at the
// start of the sequence.
//
// So, we have to move all those markers after subsequent s_close tags.
//
while (loneMarkers.length) {
i = loneMarkers.pop();
j = i + 1;
while (j < state.tokens.length && state.tokens[j].type === 's_close') {
j++;
}
j--;
if (i !== j) {
token = state.tokens[j];
state.tokens[j] = state.tokens[i];
state.tokens[i] = token;
}
}
}
// Walk through delimiter list and replace text tokens with tags
//
module.exports.postProcess = function strikethrough(state) {
var curr,
tokens_meta = state.tokens_meta,
max = state.tokens_meta.length;
postProcess(state, state.delimiters);
for (curr = 0; curr < max; curr++) {
if (tokens_meta[curr] && tokens_meta[curr].delimiters) {
postProcess(state, tokens_meta[curr].delimiters);
}
}
};
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