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var Q = require('q');
var _ = require('lodash');
var path = require('path');
var cheerio = require('cheerio');
var links = require('./links');
var imgUtils = require('./images');
var fs = require('./fs');
function replaceText($, el, search, replace, text_only ) {
return $(el).each(function(){
var node = this.firstChild,
val,
new_val,
// Elements to be removed at the end.
remove = [];
// Only continue if firstChild exists.
if ( node ) {
// Loop over all childNodes.
do {
// Only process text nodes.
if ( node.nodeType === 3 ) {
// The original node value.
val = node.nodeValue;
// The new value.
new_val = val.replace( search, replace );
// Only replace text if the new value is actually different!
if ( new_val !== val ) {
if ( !text_only && /</.test( new_val ) ) {
// The new value contains HTML, set it in a slower but far more
// robust way.
$(node).before( new_val );
// Don't remove the node yet, or the loop will lose its place.
remove.push( node );
} else {
// The new value contains no HTML, so it can be set in this
// very fast, simple way.
node.nodeValue = new_val;
}
}
}
} while ( node = node.nextSibling );
}
// Time to remove those elements!
remove.length && $(remove).remove();
});
};
function pregQuote( str ) {
return (str+'').replace(/([\\\.\+\*\?\[\^\]\$\(\)\{\}\=\!\<\>\|\:])/g, "\\$1");
};
// Adapt an html snippet to be relative to a base folder
function normalizeHtml(src, options) {
var $ = cheerio.load(src);
var toConvert = [];
$("img").each(function() {
var src = $(this).attr("src");
// Transform as absolute
if (links.isRelative(src)) {
src = links.toAbsolute(src, options.base, options.output);
}
// Convert if needed
if (options.convertImages) {
var ext = path.extname(src);
if (_.contains(imgUtils.INVALID, ext)) {
// Replace extension
var dest = path.join(path.dirname(src), path.basename(src, ext)+".png");
// Absolute with input
dest = path.resolve(options.book.root, dest);
// Get a name that doesn't exists
dest = fs.getUniqueFilename(dest);
// Reset as relative to book
dest = path.relative(options.book.root, dest);
options.book.log.debug.ln("detect invalid image (will be converted to png):", src);
toConvert.push({
source: src,
dest: dest
});
src = dest;
}
}
$(this).attr("src", src);
});
$("a").each(function() {
var href = $(this).attr("href");
if (links.isRelative(href)) {
var absolutePath = path.join(options.base, href);
// If is in navigation relative: change extsnio nto be .html
if (options.navigation[absolutePath]) href = links.changeExtension(href, ".html");
// Transform as absolute
href = links.toAbsolute(href, options.base, options.output);
} else {
$(this).attr("target", "_blank");
}
// Transform extension
$(this).attr("href", href);
});
// Replace glossayr terms
_.each(options.glossary, function(term) {
var r = new RegExp( "\\b(" + pregQuote(term.name.toLowerCase()) + ")\\b" , 'gi' );
var includedInFiles = false;
$("*").each(function() {
replaceText($, this, r, function(match) {
if (!includedInFiles) {
includedInFiles = true;
term.files = term.files || [];
term.files.push(options.navigation[options.input]);
}
return "<a href='"+links.toAbsolute("GLOSSARY.html", options.base, options.output)+"#"+term.id+"' class='glossary-term' title='"+term.description+"'>"+match+"</span>";
});
});
});
return {
html: $.html(),
images: toConvert
};
};
// Convert svg images to png
function convertImages(images, options) {
return _.reduce(images, function(prev, image) {
return prev.then(function() {
var imgin = path.resolve(options.book.root, image.source);
var imgout = path.resolve(options.book.options.output, image.dest);
options.book.log.debug("convert image", image.source, "to", image.dest, "...");
return imgUtils.convert(imgin, imgout)
.then(function() {
options.book.log.debug.ok();
}, function() {
options.book.log.debug.fail();
});
});
}, Q());
};
// Adapt page content to be relative to a base folder
function normalizePage(sections, options) {
options = _.defaults(options || {}, {
// Current book
book: null,
// Do we need to convert svg?
convertImages: false,
// Current file path
input: ".",
// Navigation to use to transform path
navigation: {},
// Directory parent of the file currently in rendering process
base: "./",
// Directory parent from the html output
output: "./",
// Glossary terms
glossary: []
});
// List of images to convert
var toConvert = [];
sections = _.map(sections, function(section) {
if (section.type != "normal") return section;
var out = normalizeHtml(section.content, options);;
toConvert = toConvert.concat(out.images);
section.content = out.html;
return section;
});
return Q()
.then(function() {
return convertImages(toConvert, options);
})
.thenResolve(sections);
};
// Extract text from sections
function extractText(sections) {
return _.reduce(sections, function(prev, section) {
if (section.type != "normal") return prev;
var $ = cheerio.load(section.content);
$("*").each(function() {
prev = prev+" "+$(this).text();
});
return prev;
}, "");
};
module.exports = {
normalize: normalizePage,
extractText: extractText
};
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