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// heading (#, ##, ...)
'use strict';
var isWhiteSpace = require('../helpers').isWhiteSpace;
var skipSpaces = require('../helpers').skipSpaces;
var skipCharsBack = require('../helpers').skipCharsBack;
module.exports = function heading(state, startLine, endLine, silent) {
var ch, level,
pos = state.bMarks[startLine],
max = state.eMarks[startLine],
offset = state.tShift[startLine];
if (offset > 3) { return false; }
pos += offset;
if (pos >= max) { return false; }
ch = state.src.charCodeAt(pos);
if (ch !== 0x23/* # */ || pos >= max) { return false; }
// count heading level
level = 1;
ch = state.src.charCodeAt(++pos);
while (ch === 0x23/* # */ && pos < max && level <= 6) {
level++;
ch = state.src.charCodeAt(++pos);
}
if (level > 6 || (pos < max && !isWhiteSpace(ch))) { return false; }
// skip spaces before heading text
pos = skipSpaces(state, pos);
// Now pos contains offset of first heared char
// Let's cut tails like ' ### ' from the end of string
max = skipCharsBack(state, max, 0x20/* space */, pos);
max = skipCharsBack(state, max, 0x23/* # */, pos);
if (max < state.eMarks[startLine] &&
state.src.charCodeAt(max) === 0x23/* # */ &&
state.src.charCodeAt(max - 1) === 0x5C/* \ */) {
max++;
}
// ## Foo ####
// ^^^
max = skipCharsBack(state, max, 0x20/* space */, pos);
if (silent) { return true; }
state.tokens.push({ type: 'heading_open', level: level });
// only if header is not empty
if (pos < max) {
state.lexerInline.tokenize(state, pos, max);
}
state.tokens.push({ type: 'heading_close', level: level });
state.line = startLine + 1;
return true;
};