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// Clean up tokens after emphasis and strikethrough postprocessing:
// merge adjacent text nodes into one and re-calculate all token levels
//
// This is necessary because initially emphasis delimiter markers (*, _, ~)
// are treated as their own separate text tokens. Then emphasis rule either
// leaves them as text (needed to merge with adjacent text) or turns them
// into opening/closing tags (which messes up levels inside).
//
'use strict';
module.exports = function text_collapse(state) {
var curr, last,
level = 0,
tokens = state.tokens,
max = state.tokens.length;
for (curr = last = 0; curr < max; curr++) {
// re-calculate levels after emphasis/strikethrough turns some text nodes
// into opening/closing tags
if (tokens[curr].nesting < 0) level--; // closing tag
tokens[curr].level = level;
if (tokens[curr].nesting > 0) level++; // opening tag
if (tokens[curr].type === 'text' &&
curr + 1 < max &&
tokens[curr + 1].type === 'text') {
// collapse two adjacent text nodes
tokens[curr + 1].content = tokens[curr].content + tokens[curr + 1].content;
} else {
if (curr !== last) { tokens[last] = tokens[curr]; }
last++;
}
}
if (curr !== last) {
tokens.length = last;
}
};
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