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var promises = require("./promises");
var async = require("async");
var htmlPaths = require("./html-paths");
var HtmlGenerator = require("./html-generator").HtmlGenerator;
var results = require("./results");
exports.DocumentConverter = DocumentConverter;
// TODO: investigate tidier solutions
if (typeof setImmediate === "undefined") {
var setImmediate = function(callback) {
setTimeout(callback, 0);
};
}
function DocumentConverter(options) {
options = options || {};
var defaultParagraphStyle = htmlPaths.topLevelElement("p");
var styleMap = options.styleMap || [];
function convertToHtml(document) {
var messages = [];
var html = new HtmlGenerator({prettyPrint: options.prettyPrint});
return promises.nfcall(elementToHtml, document, html, messages).then(function() {
html.closeAll();
return new results.Result(html.asString(), messages);
});
}
function convertElements(elements, html, messages, callback) {
async.eachSeries(elements, function(element, callback) {
return elementToHtml(element, html, messages, callback);
}, callback);
}
function elementToHtml(element, html, messages, callback) {
var handler = elementConverters[element.type];
if (handler) {
handler(element, html, messages, callback);
} else {
callback();
}
}
function convertParagraph(element, html, messages, callback) {
html.satisfyPath(styleForParagraph(element, messages));
setImmediate(function() {
convertElements(element.children, html, messages, callback);
});
}
function styleForParagraph(element, messages) {
var style = findStyle(element);
if (style) {
return style.to;
} else {
if (element.styleId) {
messages.push(unrecognisedStyleWarning("paragraph", element));;
}
return defaultParagraphStyle;
}
}
function convertRun(run, html, messages, callback) {
var runHtml = new HtmlGenerator();
if (run.styleId) {
var style = findStyle(run);
if (style) {
runHtml.satisfyPath(style.to);
} else {
messages.push(unrecognisedStyleWarning("run", run));
}
}
if (run.isBold) {
runHtml.open(htmlPaths.element("strong"));
}
if (run.isItalic) {
runHtml.open(htmlPaths.element("em"));
}
convertElements(run.children, runHtml, messages, function(err) {
if (err) {
callback(err);
} else {
runHtml.closeAll();
html.append(runHtml);
callback();
}
});
}
function findStyle(element) {
for (var i = 0; i < styleMap.length; i++) {
if (styleMap[i].from.matches(element)) {
return styleMap[i];
}
}
}
function defaultConvertImage(element, html, messages, callback) {
element.read("base64").then(function(imageBuffer) {
var src = "data:" + element.contentType + ";base64," + imageBuffer;
var attributes = {src: src};
if (element.altText) {
attributes.alt = element.altText;
}
html.selfClosing(htmlPaths.element("img", attributes));
callback();
}).fail(callback);
}
var elementConverters = {
"document": function(document, html, messages, callback) {
convertElements(document.children, html, messages, callback);
},
"paragraph": convertParagraph,
"run": convertRun,
"text": function(element, html, messages, callback) {
html.text(element.value);
callback();
},
"tab": function(element, html, messages, callback) {
html.text("\t");
callback();
},
"hyperlink": function(element, html, messages, callback) {
html.open(htmlPaths.element("a", {href: element.href}));
convertElements(element.children, html, messages, function(err) {
if (err) {
callback(err);
} else {
html.close();
callback();
}
});
},
"image": options.convertImage || defaultConvertImage
};
return {
convertToHtml: convertToHtml
};
}
function unrecognisedStyleWarning(type, element) {
return results.warning(
"Unrecognised " + type + " style: '" + element.styleName + "'" +
" (Style ID: " + element.styleId + ")"
);
}
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