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var _ = require('lodash');
var marked = require('marked');
// 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
}
function isQuizNode(node) {
return (/^[(\[][ x][)\]]/).test(node.text || node);
}
function isExercise(nodes) {
var codeType = { type: 'code' };
// Number of code nodes in section
var len = _.filter(nodes, codeType).length;
return (
// Got 3 or 4 code blocks
(len === 3 || len === 4) &&
// Ensure all nodes are at the end
_.all(_.last(nodes, len), codeType)
);
}
function isQuiz(nodes) {
if (nodes.length < 3) {
return false;
}
// Support having a first paragraph block
// before our series of questions
var quizNodes = nodes.slice(nodes[0].type === 'paragraph' ? 1 : 0);
// No questions
if (!_.some(quizNodes, { type: 'blockquote_start' })) {
return false;
}
// Check if section has list of questions
// or table of questions
var listIdx = _.findIndex(quizNodes, { type: 'list_item_start' });
var tableIdx = _.findIndex(quizNodes, { type: 'table' });
if(
// List of questions
listIdx !== -1 && isQuizNode(quizNodes[listIdx + 1]) ||
// Table of questions
(
tableIdx !== -1 &&
_.every(quizNodes[tableIdx].cells[0].slice(1), isQuizNode)
)
) {
return true;
}
return false;
}
// What is the type of this section
function sectionType(nodes, idx) {
if(isExercise(nodes)) {
return 'exercise';
} else if(isQuiz(nodes)) {
return 'quiz';
}
return 'normal';
}
// Generate a uniqueId to identify this section in our code
function sectionId(section, idx) {
return _.uniqueId('gitbook_');
}
function lexPage(src) {
// 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;
})
.map(function(section, idx) {
// Give each section an ID
section.id = sectionId(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;
}, [])
.value();
}
// Exports
module.exports = lexPage;
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