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var _ = require('lodash');
var kramed = require('kramed');
// Utility function for splitting a list into groups
function splitBy(list, starter, ender) {
var starts = 0;
var ends = 0;
var group = [];
// Groups
return _.reduce(list, function(groups, value) {
// Ignore start and end delimiters in resulted groups
if(starter(value)) {
starts++;
} else if(ender(value)) {
ends++;
}
// Add current value to group
group.push(value);
// We've got a matching
if(starts === ends && starts !== 0) {
// Add group to end groups
// (remove starter and ender token)
groups.push(group.slice(1, -1));
// Reset group
group = [];
}
return groups;
}, []);
}
function skipSpace(nodes) {
return _.filter(nodes, function(node) {
return node && node.type != 'space';
});
}
function correctLoose(nodes) {
return _.map(nodes, function(node) {
// Return normal nodes
if(!node || node.type != 'loose_item_start') {
return node
}
// Correct loose items
node.type = 'list_item_start';
return node;
})
}
function listSplit(nodes, start_type, end_type) {
return splitBy(nodes, function(el) {
return el.type === start_type;
}, function(el) {
return el.type === end_type;
});
}
// Get the biggest list
// out of a list of kramed nodes
function filterList(nodes) {
return _.chain(nodes)
.toArray()
.dropWhile(function(el) {
// Get everything after list_start
return el.type !== 'list_start';
})
.reverse()
.dropWhile(function(el) {
// Get everything after list_end (remember we're reversed)
return el.type !== 'list_end';
})
.reverse()
.value().slice(1, -1);
}
// Parses an Article or Chapter title
// supports extracting links
function parseTitle(src) {
// Check if it's a link
var matches = kramed.InlineLexer.rules.link.exec(src);
// Not a link, return plain text
if(!matches) {
return {
title: src,
path: null,
};
}
return {
title: matches[1],
path: matches[2],
};
}
function parseChapter(nodes) {
var node = _.first(nodes);
if (!node) return null;
return _.extend(parseTitle(node.text), {
articles: _.chain(listSplit(filterList(nodes), 'list_item_start', 'list_item_end'))
.map(function(nodes, i) {
return parseChapter(nodes);
})
.compact()
.value()
});
}
function listGroups(src) {
var nodes = kramed.lexer(src);
// Get out groups of lists
return listSplit(
filterList(correctLoose(skipSpace(nodes))),
'list_item_start', 'list_item_end'
);
}
function parseSummary(src) {
// Split out chapter sections
var chapters = _.chain(listGroups(src))
.map(parseChapter)
.compact()
.value();
return {
chapters: chapters
};
}
function parseEntries(src) {
return _.chain(listGroups(src))
.map(parseChapter)
.compact()
.value();
}
function summaryToMarkdown(summary) {
var bl = "\n";
var content = "# Summary"+bl+bl;
var _base = function(article) {
if (article.path) {
return "* ["+article.title+"]("+article.path+")";
} else {
return "* "+article.title;
}
};
var convertArticle = function(article, d) {
content = content + Array(4*d).join(" ") + _base(article)+bl;
_.each(article.articles, function(_article) {
convertArticle(_article, d + 1);
});
};
_.each(summary.chapters, function(chapter) {
convertArticle(chapter, 0);
});
content = content+bl;
return content;
};
module.exports = parseSummary;
module.exports.entries = parseEntries;
module.exports.toText = summaryToMarkdown;
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