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text_collapse.js
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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; } };