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// Process ~subscript~
'use strict';
// same as UNESCAPE_MD_RE plus a space
var UNESCAPE_RE = /\\([ \\!"#$%&'()*+,.\/:;<=>?@[\]^_`{|}~-])/g;
module.exports = function sub(state, silent) {
var found,
content,
max = state.posMax,
start = state.pos;
if (state.src.charCodeAt(start) !== 0x7E/* ~ */) { return false; }
if (silent) { return false; } // don't run any pairs in validation mode
if (start + 2 >= max) { return false; }
if (state.level >= state.options.maxNesting) { return false; }
state.pos = start + 1;
while (state.pos < max) {
if (state.src.charCodeAt(state.pos) === 0x7E/* ~ */) {
found = true;
break;
}
state.parser.skipToken(state);
}
if (!found || start + 1 === state.pos) {
state.pos = start;
return false;
}
content = state.src.slice(start + 1, state.pos);
// don't allow unescaped spaces/newlines inside
if (content.match(/(^|[^\\])(\\\\)*\s/)) {
state.pos = start;
return false;
}
// found!
state.posMax = state.pos;
state.pos = start + 1;
if (!silent) {
state.push({
type: 'sub',
level: state.level,
content: content.replace(UNESCAPE_RE, '$1')
});
}
state.pos = state.posMax + 1;
state.posMax = max;
return true;
};