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var _ = require('lodash');
var marked = require('marked');
var hljs = require('highlight.js');
var renderer = require('./renderer');
var lnormalize = require('../utils/lang').normalize;
// Synchronous highlighting with highlight.js
marked.setOptions({
highlight: function (code, lang) {
try {
return hljs.highlight(lang, code).value;
} catch(e) {
return hljs.highlightAuto(code).value;
}
}
});
// Split a page up into sections (lesson, exercises, ...)
function splitSections(nodes) {
var section = [];
return _.reduce(nodes, function(sections, el) {
if(el.type === 'hr') {
sections.push(section);
section = [];
} else {
section.push(el);
}
return sections;
}, []).concat([section]); // Add remaining nodes
}
// What is the type of this section
function sectionType(nodes, idx) {
var codeNodes = _.filter(nodes, {
type: 'code'
}).length;
if(codeNodes === 3 && (idx % 2) == 1) {
return 'exercise';
}
return 'normal';
}
// Render a section using our custom renderer
function render(section, _options) {
// Copy section
section = _.toArray(section);
// marked's Render expects this, we don't use it yet
section.links = {};
// Build options using defaults and our custom renderer
var options = _.extend({}, marked.defaults, {
renderer: renderer(null, _options)
});
return marked.parser(section, options);
}
function parsePage(src, options) {
options = options || {};
// Lex file
var nodes = marked.lexer(src);
return _.chain(splitSections(nodes))
.map(function(section, idx) {
// Detect section type
section.type = sectionType(section, idx);
return section;
})
.filter(function(section) {
return !_.isEmpty(section);
})
.reduce(function(sections, section) {
var last = _.last(sections);
// Merge normal sections together
if(last && last.type === section.type && last.type === 'normal') {
last.push.apply(last, [{'type': 'hr'}].concat(section));
} else {
// Add to list of sections
sections.push(section);
}
return sections;
}, [])
.map(function(section) {
// Generate a uniqueId to identify this section in our code
var id = _.uniqueId('gitbook_');
// Transform given type
if(section.type === 'exercise') {
var nonCodeNodes = _.reject(section, {
'type': 'code'
});
var codeNodes = _.filter(section, {
'type': 'code'
});
// Languages in code blocks
var langs = _.pluck(codeNodes, 'lang').map(lnormalize);
// Check that they are all the same
var validLangs = _.all(_.map(langs, function(lang) {
return lang && lang === langs[0];
}));
// Main language
var lang = validLangs ? langs[0] : null;
return {
id: id,
type: section.type,
content: render(nonCodeNodes),
lang: lang,
code: {
base: codeNodes[0].text,
solution: codeNodes[1].text,
validation: codeNodes[2].text,
}
};
}
// Render normal pages
return {
id: id,
type: section.type,
content: render(section, options)
};
})
.value();
}
// Exports
module.exports = parsePage;
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