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165 lines
5.0 KiB
JavaScript
165 lines
5.0 KiB
JavaScript
// @export html_scanner
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html_scanner = {
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// Scan a template file for <head>, <body>, and <template>
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// tags and extract their contents.
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//
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// This is a primitive, regex-based scanner. It scans
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// top-level tags, which are allowed to have attributes,
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// and ignores top-level HTML comments.
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// Has fields 'message', 'line'
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ParseError: function () {
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},
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scan: function (contents, source_name) {
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var rest = contents;
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var index = 0;
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var advance = function(amount) {
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rest = rest.substring(amount);
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index += amount;
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};
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var throwParseError = function(msg) {
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var ret = new html_scanner.ParseError;
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ret.message = msg || "bad formatting in HTML template";
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ret.file = source_name;
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ret.line = contents.substring(0, index).split('\n').length;
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throw ret;
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};
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var results = html_scanner._initResults();
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var rOpenTag = /^((<(template|head|body)\b)|(<!--)|(<!DOCTYPE|{{!)|$)/i;
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while (rest) {
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// skip whitespace first (for better line numbers)
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advance(rest.match(/^\s*/)[0].length);
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var match = rOpenTag.exec(rest);
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if (! match)
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throwParseError(); // unknown text encountered
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var matchToken = match[1];
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var matchTokenTagName = match[3];
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var matchTokenComment = match[4];
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var matchTokenUnsupported = match[5];
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advance(match.index + match[0].length);
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if (! matchToken)
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break; // matched $ (end of file)
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if (matchTokenComment === '<!--') {
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// top-level HTML comment
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var commentEnd = /--\s*>/.exec(rest);
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if (! commentEnd)
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throwParseError("unclosed HTML comment");
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advance(commentEnd.index + commentEnd[0].length);
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continue;
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}
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if (matchTokenUnsupported) {
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switch (matchTokenUnsupported.toLowerCase()) {
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case '<!doctype':
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throwParseError(
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"Can't set DOCTYPE here. (Meteor sets <!DOCTYPE html> for you)");
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case '{{!':
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throwParseError(
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"Can't use '{{! }}' outside a template. Use '<!-- -->'.");
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}
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throwParseError();
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}
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// otherwise, a <tag>
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var tagName = matchTokenTagName.toLowerCase();
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var tagAttribs = {}; // bare name -> value dict
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var rTagPart = /^\s*((([a-zA-Z0-9:_-]+)\s*=\s*(["'])(.*?)\4)|(>))/;
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var attr;
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// read attributes
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while ((attr = rTagPart.exec(rest))) {
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var attrToken = attr[1];
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var attrKey = attr[3];
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var attrValue = attr[5];
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advance(attr.index + attr[0].length);
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if (attrToken === '>')
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break;
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// XXX we don't HTML unescape the attribute value
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// (e.g. to allow "abcd"efg") or protect against
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// collisions with methods of tagAttribs (e.g. for
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// a property named toString)
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attrValue = attrValue.match(/^\s*([\s\S]*?)\s*$/)[1]; // trim
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tagAttribs[attrKey] = attrValue;
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}
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if (! attr) // didn't end on '>'
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throwParseError("Parse error in tag");
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// find </tag>
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var end = (new RegExp('</'+tagName+'\\s*>', 'i')).exec(rest);
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if (! end)
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throwParseError("unclosed <"+tagName+">");
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var tagContents = rest.slice(0, end.index);
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advance(end.index + end[0].length);
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// act on the tag
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html_scanner._handleTag(results, tagName, tagAttribs, tagContents,
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throwParseError);
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}
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return results;
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},
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_initResults: function() {
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var results = {};
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results.head = '';
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results.body = '';
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results.js = '';
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return results;
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},
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_handleTag: function (results, tag, attribs, contents, throwParseError) {
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// trim the tag contents.
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// this is a courtesy and is also relied on by some unit tests.
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contents = contents.match(/^[ \t\r\n]*([\s\S]*?)[ \t\r\n]*$/)[1];
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// do we have 1 or more attribs?
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var hasAttribs = false;
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for(var k in attribs) {
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if (attribs.hasOwnProperty(k)) {
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hasAttribs = true;
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break;
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}
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}
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if (tag === "head") {
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if (hasAttribs)
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throwParseError("Attributes on <head> not supported");
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results.head += contents;
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return;
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}
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// <body> or <template>
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var code = 'Package.handlebars.Handlebars.json_ast_to_func(' +
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JSON.stringify(Handlebars.to_json_ast(contents)) + ')';
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if (tag === "template") {
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var name = attribs.name;
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if (! name)
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throwParseError("Template has no 'name' attribute");
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results.js += "Meteor._def_template(" + JSON.stringify(name) + ","
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+ code + ");\n";
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} else {
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// <body>
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if (hasAttribs)
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throwParseError("Attributes on <body> not supported");
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results.js += "Meteor.startup(function(){" +
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"document.body.appendChild(Spark.render(" +
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"Meteor._def_template(null," + code + ")));});";
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}
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}
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};
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// If we are running at bundle time, set module.exports.
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// For unit testing in server environment, don't.
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if (typeof module !== 'undefined')
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module.exports = html_scanner; |