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// Block parser
'use strict';
var Ruler = require('./ruler');
var State = require('./rules_block/state_block');
var skipEmptyLines = require('./helpers').skipEmptyLines;
var isEmpty = require('./helpers').isEmpty;
var rules = [];
// `list` should be after `hr`, but before `heading`
rules.push([ require('./rules_block/code') ]);
rules.push([ require('./rules_block/fences'), 'paragraph', 'blockquote', 'list' ]);
rules.push([ require('./rules_block/blockquote'), 'paragraph', 'blockquote', 'list' ]);
rules.push([ require('./rules_block/hr'), 'paragraph', 'blockquote', 'list' ]);
rules.push([ require('./rules_block/list'), 'paragraph', 'blockquote' ]);
rules.push([ require('./rules_block/heading'), 'paragraph', 'blockquote' ]);
rules.push([ require('./rules_block/lheading') ]);
rules.push([ require('./rules_block/htmlblock'), 'paragraph', 'blockquote' ]);
rules.push([ require('./rules_block/table'), 'paragraph' ]);
rules.push([ require('./rules_block/paragraph') ]);
// Block Parser class
//
function ParserBlock() {
this._rules = [];
this._rulesParagraphTerm = [];
this._rulesBlockquoteTerm = [];
this._rulesListTerm = [];
this.ruler = new Ruler(this.rulesUpdate.bind(this));
for (var i = 0; i < rules.length; i++) {
this.ruler.after(rules[i][0], rules[i].slice(1));
}
}
ParserBlock.prototype.rulesUpdate = function () {
this._rules = this.ruler.getRules();
this._rulesParagraphTerm = this.ruler.getRules('paragraph');
this._rulesBlockquoteTerm = this.ruler.getRules('blockquote');
this._rulesListTerm = this.ruler.getRules('list');
};
// Generate tokens for input range
//
ParserBlock.prototype.tokenize = function (state, startLine, endLine) {
var ok, i,
rules = this._rules,
len = this._rules.length,
line = startLine,
hasEmptyLines = false;
while (line < endLine) {
state.line = line = skipEmptyLines(state, line, endLine);
if (line >= endLine) { break; }
if (state.tShift[line] < state.blkIndent) { break; }
if (state.bqMarks[line] < state.bqLevel) { break; }
// Try all possible rules.
// On success, rule should:
//
// - update `state.line`
// - update `state.tokens`
// - return true
for (i = 0; i < len; i++) {
ok = rules[i](state, line, endLine, false);
if (ok) { break; }
}
if (!ok) { throw new Error('No matching rules found'); }
if (line === state.line) {
throw new Error('None of rules updated state.line');
}
// set state.tight iff we had an empty line before current tag
// i.e. latest empty line should not count
state.tight = !hasEmptyLines;
// paragraph might "eat" one newline after it in nested lists
if (isEmpty(state, state.line - 1)) {
hasEmptyLines = true;
}
line = state.line;
if (line < endLine && isEmpty(state, line)) {
hasEmptyLines = true;
line++;
// two empty lines should stop the parser in list mode
if (line < endLine && state.listMode && isEmpty(state, line)) { break; }
state.line = line;
}
}
};
ParserBlock.prototype.parse = function (src, options, env) {
var state, lineStart = 0, lastTabPos = 0;
if (!src) { return ''; }
if (src.indexOf('\r') >= 0) {
src = src.replace(/\r/, '');
}
if (src.indexOf('\u00a0') >= 0) {
src = src.replace(/\u00a0/g, ' ');
}
if (src.indexOf('\u2424') >= 0) {
src = src.replace(/\u2424/g, '\n');
}
// TODO: benchmark it
// Replace tabs with proper number of spaces (1..4)
if (src.indexOf('\t') >= 0) {
src = src.replace(/[\n\t]/g, function (match, offset) {
var result;
if (src.charCodeAt(offset) === 0x0A) {
lineStart = offset + 1;
lastTabPos = 0;
return match;
}
result = ' '.slice((offset - lineStart - lastTabPos) % 4);
lastTabPos = offset - lineStart + 1;
return result;
});
}
state = new State(
src,
this,
[],
options,
env
);
this.tokenize(state, state.line, state.lineMax);
return state.tokens;
};
module.exports = ParserBlock;