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+var _ = require('lodash');
+var path = require('path');
+var direction = require('direction');
+var fm = require('front-matter');
+
+var error = require('../utils/error');
+var pathUtil = require('../utils/path');
+var location = require('../utils/location');
+var parsers = require('../parsers');
+var gitbook = require('../gitbook');
+var pluginCompatibility = require('../plugins/compatibility');
+var HTMLPipeline = require('./html');
+
+/*
+A page represent a parsable file in the book (Markdown, Asciidoc, etc)
+*/
+
+function Page(book, filename) {
+ if (!(this instanceof Page)) return new Page(book, filename);
+ var extension;
+ _.bindAll(this);
+
+ this.book = book;
+ this.log = this.book.log;
+
+ // Current content
+ this.content = '';
+
+ // Short description for the page
+ this.description = '';
+
+ // Relative path to the page
+ this.path = location.normalize(filename);
+
+ // Absolute path to the page
+ this.rawPath = this.book.resolve(filename);
+
+ // Last modification date
+ this.mtime = 0;
+
+ // Can we parse it?
+ extension = path.extname(this.path);
+ this.parser = parsers.get(extension);
+ if (!this.parser) throw error.ParsingError(new Error('Can\'t parse file "'+this.path+'"'));
+
+ this.type = this.parser.name;
+}
+
+// Return the filename of the page with another extension
+// "README.md" -> "README.html"
+Page.prototype.withExtension = function(ext) {
+ return pathUtil.setExtension(this.path, ext);
+};
+
+// Resolve a filename relative to this page
+// It returns a path relative to the book root folder
+Page.prototype.resolveLocal = function() {
+ var dir = path.dirname(this.path);
+ var file = path.join.apply(path, _.toArray(arguments));
+
+ return location.toAbsolute(file, dir, '');
+};
+
+// Resolve a filename relative to this page
+// It returns an absolute path for the FS
+Page.prototype.resolve = function() {
+ return this.book.resolve(this.resolveLocal.apply(this, arguments));
+};
+
+// Convert an absolute path (in the book) to a relative path from this page
+Page.prototype.relative = function(name) {
+ // Convert /test.png -> test.png
+ name = location.toAbsolute(name, '', '');
+
+ return location.relative(
+ this.resolve('.') + '/',
+ this.book.resolve(name)
+ );
+};
+
+// Return a page result of a relative page from this page
+Page.prototype.followPage = function(filename) {
+ var absPath = this.resolveLocal(filename);
+ return this.book.getPage(absPath);
+};
+
+// Update content of the page
+Page.prototype.update = function(content) {
+ this.content = content;
+};
+
+// Read the page as a string
+Page.prototype.read = function() {
+ var that = this;
+
+ return this.book.statFile(this.path)
+ .then(function(stat) {
+ that.mtime = stat.mtime;
+ return that.book.readFile(that.path);
+ })
+ .then(this.update);
+};
+
+// Return templating context for this page
+// This is used both for themes and page parsing
+Page.prototype.getContext = function() {
+ var article = this.book.summary.getArticle(this);
+ var next = article? article.next() : null;
+ var prev = article? article.prev() : null;
+
+ // Detect text direction in this page
+ var dir = this.book.config.get('direction');
+ if (!dir) {
+ dir = direction(this.content);
+ if (dir == 'neutral') dir = null;
+ }
+
+ return _.extend(
+ {
+ file: {
+ path: this.path,
+ mtime: this.mtime,
+ type: this.type
+ },
+ page: {
+ title: article? article.title : null,
+ description: this.description,
+ next: next? next.getContext() : null,
+ previous: prev? prev.getContext() : null,
+ level: article? article.level : null,
+ depth: article? article.depth : 0,
+ content: this.content,
+ dir: dir
+ }
+ },
+ gitbook.getContext(),
+ this.book.getContext(),
+ this.book.langs.getContext(),
+ this.book.summary.getContext(),
+ this.book.glossary.getContext(),
+ this.book.config.getContext()
+ );
+};
+
+// Parse the page and return its content
+Page.prototype.toHTML = function(output) {
+ var that = this;
+
+ this.log.debug.ln('start parsing file', this.path);
+
+ // Call a hook in the output
+ // using an utility to "keep" compatibility with gitbook 2
+ function hook(name) {
+ return pluginCompatibility.pageHook(that, function(ctx) {
+ return output.plugins.hook(name, ctx);
+ })
+ .then(function(result) {
+ if(_.isString(result)) that.update(result);
+ });
+ }
+
+ return this.read()
+
+ // Parse yaml front matter
+ .then(function() {
+ var parsed = fm(that.content);
+
+ // Extend page with the fontmatter attribute
+ that.description = parsed.attributes.description || '';
+
+ // Keep only the body
+ that.update(parsed.body);
+ })
+
+ .then(function() {
+ return hook('page:before');
+ })
+
+ // Pre-process page with parser
+ .then(function() {
+ return that.parser.page.prepare(that.content)
+ .then(that.update);
+ })
+
+ // Render template
+ .then(function() {
+ return output.template.render(that.content, that.getContext(), {
+ path: that.path
+ })
+ .then(that.update);
+ })
+
+ // Render markup using the parser
+ .then(function() {
+ return that.parser.page(that.content)
+ .then(function(out) {
+ that.update(out.content);
+ });
+ })
+
+ // Post process templating
+ .then(function() {
+ return output.template.postProcess(that.content)
+ .then(that.update);
+ })
+
+ // Normalize HTML output
+ .then(function() {
+ var pipelineOpts = {
+ onRelativeLink: _.partial(output.onRelativeLink, that),
+ onImage: _.partial(output.onOutputImage, that),
+ onOutputSVG: _.partial(output.onOutputSVG, that),
+
+ // Use 'code' template block
+ onCodeBlock: function(source, lang) {
+ return output.template.applyBlock('code', {
+ body: source,
+ kwargs: {
+ language: lang
+ }
+ });
+ },
+
+ // Extract description from page's content if no frontmatter
+ onDescription: function(description) {
+ if (that.description) return;
+ that.description = description;
+ },
+
+ // Convert glossary entries to annotations
+ annotations: that.book.glossary.annotations()
+ };
+ var pipeline = new HTMLPipeline(that.content, pipelineOpts);
+
+ return pipeline.output()
+ .then(that.update);
+ })
+
+ .then(function() {
+ return hook('page');
+ })
+
+ // Return content itself
+ .then(function() {
+ return that.content;
+ });
+};
+
+
+module.exports = Page;