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// Process *this* and _that_
//
'use strict';
// Insert each marker as a separate text token, and add it to delimiter list
//
module.exports.tokenize = function emphasis(state, silent) {
var i, scanned, token,
start = state.pos,
marker = state.src.charCodeAt(start);
if (silent) { return false; }
if (marker !== 0x5F /* _ */ && marker !== 0x2A /* * */) { return false; }
scanned = state.scanDelims(state.pos, marker === 0x2A);
for (i = 0; i < scanned.length; i++) {
token = state.push('text', '', 0);
token.content = String.fromCharCode(marker);
state.delimiters.push({
// Char code of the starting marker (number).
//
marker: marker,
// Total length of these series of delimiters.
//
length: scanned.length,
// A position of the token this delimiter corresponds to.
//
token: state.tokens.length - 1,
// If this delimiter is matched as a valid opener, `end` will be
// equal to its position, otherwise it's `-1`.
//
end: -1,
// Boolean flags that determine if this delimiter could open or close
// an emphasis.
//
open: scanned.can_open,
close: scanned.can_close
});
}
state.pos += scanned.length;
return true;
};
function postProcess(state, delimiters) {
var i,
startDelim,
endDelim,
token,
ch,
isStrong,
max = delimiters.length;
for (i = max - 1; i >= 0; i--) {
startDelim = delimiters[i];
if (startDelim.marker !== 0x5F/* _ */ && startDelim.marker !== 0x2A/* * */) {
continue;
}
// Process only opening markers
if (startDelim.end === -1) {
continue;
}
endDelim = delimiters[startDelim.end];
// If the previous delimiter has the same marker and is adjacent to this one,
// merge those into one strong delimiter.
//
// `<em><em>whatever</em></em>` -> `<strong>whatever</strong>`
//
isStrong = i > 0 &&
delimiters[i - 1].end === startDelim.end + 1 &&
// check that first two markers match and adjacent
delimiters[i - 1].marker === startDelim.marker &&
delimiters[i - 1].token === startDelim.token - 1 &&
// check that last two markers are adjacent (we can safely assume they match)
delimiters[startDelim.end + 1].token === endDelim.token + 1;
ch = String.fromCharCode(startDelim.marker);
token = state.tokens[startDelim.token];
token.type = isStrong ? 'strong_open' : 'em_open';
token.tag = isStrong ? 'strong' : 'em';
token.nesting = 1;
token.markup = isStrong ? ch + ch : ch;
token.content = '';
token = state.tokens[endDelim.token];
token.type = isStrong ? 'strong_close' : 'em_close';
token.tag = isStrong ? 'strong' : 'em';
token.nesting = -1;
token.markup = isStrong ? ch + ch : ch;
token.content = '';
if (isStrong) {
state.tokens[delimiters[i - 1].token].content = '';
state.tokens[delimiters[startDelim.end + 1].token].content = '';
i--;
}
}
}
// Walk through delimiter list and replace text tokens with tags
//
module.exports.postProcess = function emphasis(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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