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