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var _ = require('lodash');
var path = require('path');
var parsers = require('gitbook-parsers');
var error = require('../utils/error');
var pathUtil = require('../utils/path');
var location = require('../utils/location');
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 = '';
// Relative path to the page
this.path = 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);
};
// Filename for output
// READMEs are replaced by index.html
Page.prototype.outputPath = function(ext) {
ext = ext || '.html';
var output;
if (
path.basename(this.path, path.extname(this.path)) == 'README' ||
output == this.book.readme.path
) {
output = path.join(path.dirname(output), 'index'+ext);
} else {
output = pathUtil.setExtension(output, ext);
}
return output;
};
// 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));
};
// 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);
};
// Parse the page and return its content
Page.prototype.parse = function(output) {
var that = this;
this.log.debug.ln('start parsing file', this.path);
return this.read()
// Pre-process page with parser
.then(function() {
return that.parser.page.prepare(that.content)
.then(that.update);
})
// Render template
.then(function() {
return that.book.template.renderString(that.content, {
file: {
path: that.path,
mtime: that.mtime
}
}, {
file: that.path
})
.then(that.update);
})
// Render markup using the parser
.then(function() {
return that.parser.page(that.content)
.then(function(out) {
var content = _.pluck(out.sections, 'content').join('\n');
that.update(content);
});
})
// Normalize HTML output
.then(function() {
var pipelineOpts = {
onRelativeLink: _.partial(output.onRelativeLink, that),
onImage: _.partial(output.onOutputImage, that),
onOutputSVG: _.partial(output.onOutputSVG, that)
};
var pipeline = new HTMLPipeline(that.content, pipelineOpts);
return pipeline.output()
.then(that.update);
});
};
module.exports = Page;
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