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http://en.wikipedia.org/wiki/Conditional_comment#Downlevel-revealed_conditional_comment\n if (conditionalComment.test(html)) {\n var conditionalEnd = html.indexOf(']>');\n\n if (conditionalEnd >= 0) {\n advance(conditionalEnd + 2);\n continue\n }\n }\n\n // Doctype:\n var doctypeMatch = html.match(doctype);\n if (doctypeMatch) {\n advance(doctypeMatch[0].length);\n continue\n }\n\n // End tag:\n var endTagMatch = html.match(endTag);\n if (endTagMatch) {\n var curIndex = index;\n advance(endTagMatch[0].length);\n parseEndTag(endTagMatch[1], curIndex, index);\n continue\n }\n\n // Start tag:\n var startTagMatch = parseStartTag();\n if (startTagMatch) {\n handleStartTag(startTagMatch);\n continue\n }\n }\n\n var text = (void 0), rest$1 = (void 0), next = (void 0);\n if (textEnd > 0) {\n rest$1 = html.slice(textEnd);\n while (\n !endTag.test(rest$1) &&\n !startTagOpen.test(rest$1) &&\n !comment.test(rest$1) &&\n !conditionalComment.test(rest$1)\n ) {\n // < in plain text, be forgiving and treat it as text\n next = rest$1.indexOf('<', 1);\n if (next < 0) { break }\n textEnd += next;\n rest$1 = html.slice(textEnd);\n }\n text = html.substring(0, textEnd);\n advance(textEnd);\n }\n\n if (textEnd < 0) {\n text = html;\n html = '';\n }\n\n if (options.chars && text) {\n options.chars(text);\n }\n } else {\n var stackedTag = lastTag.toLowerCase();\n var reStackedTag = reCache[stackedTag] || (reCache[stackedTag] = new RegExp('([\\\\s\\\\S]*?)(]*>)', 'i'));\n var endTagLength = 0;\n var rest = html.replace(reStackedTag, function (all, text, endTag) {\n endTagLength = endTag.length;\n if (stackedTag !== 'script' && stackedTag !== 'style' && stackedTag !== 'noscript') {\n text = text\n .replace(//g, '$1')\n .replace(//g, '$1');\n }\n if (options.chars) {\n options.chars(text);\n }\n return ''\n });\n index += html.length - rest.length;\n html = rest;\n parseEndTag(stackedTag, index - endTagLength, index);\n }\n\n if (html === last && options.chars) {\n options.chars(html);\n break\n }\n }\n\n // Clean up any remaining tags\n parseEndTag();\n\n function advance (n) {\n index += n;\n html = html.substring(n);\n }\n\n function parseStartTag () {\n var start = html.match(startTagOpen);\n if (start) {\n var match = {\n tagName: start[1],\n attrs: [],\n start: index\n };\n advance(start[0].length);\n var end, attr;\n while (!(end = html.match(startTagClose)) && (attr = html.match(attribute))) {\n advance(attr[0].length);\n match.attrs.push(attr);\n }\n if (end) {\n match.unarySlash = end[1];\n advance(end[0].length);\n match.end = index;\n return match\n }\n }\n }\n\n function handleStartTag (match) {\n var tagName = match.tagName;\n var unarySlash = match.unarySlash;\n\n if (expectHTML) {\n if (lastTag === 'p' && isNonPhrasingTag(tagName)) {\n parseEndTag(lastTag);\n }\n if (canBeLeftOpenTag(tagName) && lastTag === tagName) {\n parseEndTag(tagName);\n }\n }\n\n var unary = isUnaryTag$$1(tagName) || tagName === 'html' && lastTag === 'head' || !!unarySlash;\n\n var l = match.attrs.length;\n var attrs = new Array(l);\n for (var i = 0; i < l; i++) {\n var args = match.attrs[i];\n // hackish work around FF bug https://bugzilla.mozilla.org/show_bug.cgi?id=369778\n if (IS_REGEX_CAPTURING_BROKEN && args[0].indexOf('\"\"') === -1) {\n if (args[3] === '') { delete args[3]; }\n if (args[4] === '') { delete args[4]; }\n if (args[5] === '') { delete args[5]; }\n }\n var value = args[3] || args[4] || args[5] || '';\n attrs[i] = {\n name: args[1],\n value: decodeAttr(\n value,\n options.shouldDecodeNewlines\n )\n };\n }\n\n if (!unary) {\n stack.push({ tag: tagName, lowerCasedTag: tagName.toLowerCase(), attrs: attrs });\n lastTag = tagName;\n unarySlash = '';\n }\n\n if (options.start) {\n options.start(tagName, attrs, unary, match.start, match.end);\n }\n }\n\n function parseEndTag (tagName, start, end) {\n var pos, lowerCasedTagName;\n if (start == null) { start = index; }\n if (end == null) { end = index; }\n\n if (tagName) {\n lowerCasedTagName = tagName.toLowerCase();\n }\n\n // Find the closest opened tag of the same type\n if (tagName) {\n for (pos = stack.length - 1; pos >= 0; pos--) {\n if (stack[pos].lowerCasedTag === lowerCasedTagName) {\n break\n }\n }\n } else {\n // If no tag name is provided, clean shop\n pos = 0;\n }\n\n if (pos >= 0) {\n // Close all the open elements, up the stack\n for (var i = stack.length - 1; i >= pos; i--) {\n if (options.end) {\n options.end(stack[i].tag, start, end);\n }\n }\n\n // Remove the open elements from the stack\n stack.length = pos;\n lastTag = pos && stack[pos - 1].tag;\n } else if (lowerCasedTagName === 'br') {\n if (options.start) {\n options.start(tagName, [], true, start, end);\n }\n } else if (lowerCasedTagName === 'p') {\n if (options.start) {\n options.start(tagName, [], false, start, end);\n }\n if (options.end) {\n options.end(tagName, start, end);\n }\n }\n }\n}\n\n/* */\n\nfunction parseFilters (exp) {\n var inSingle = false;\n var inDouble = false;\n var inTemplateString = false;\n var inRegex = false;\n var curly = 0;\n var square = 0;\n var paren = 0;\n var lastFilterIndex = 0;\n var c, prev, i, expression, filters;\n\n for (i = 0; i < exp.length; i++) {\n prev = c;\n c = exp.charCodeAt(i);\n if (inSingle) {\n if (c === 0x27 && prev !== 0x5C) { inSingle = false; }\n } else if (inDouble) {\n if (c === 0x22 && prev !== 0x5C) { inDouble = false; }\n } else if (inTemplateString) {\n if (c === 0x60 && prev !== 0x5C) { inTemplateString = false; }\n } else if (inRegex) {\n if (c === 0x2f && prev !== 0x5C) { inRegex = false; }\n } else if (\n c === 0x7C && // pipe\n exp.charCodeAt(i + 1) !== 0x7C &&\n exp.charCodeAt(i - 1) !== 0x7C &&\n !curly && !square && !paren\n ) {\n if (expression === undefined) {\n // first filter, end of expression\n lastFilterIndex = i + 1;\n expression = exp.slice(0, i).trim();\n } else {\n pushFilter();\n }\n } else {\n switch (c) {\n case 0x22: inDouble = true; break // \"\n case 0x27: inSingle = true; break // '\n case 0x60: inTemplateString = true; break // `\n case 0x28: paren++; break // (\n case 0x29: paren--; break // )\n case 0x5B: square++; break // [\n case 0x5D: square--; break // ]\n case 0x7B: curly++; break // {\n case 0x7D: curly--; break // }\n }\n if (c === 0x2f) { // /\n var j = i - 1;\n var p = (void 0);\n // find first non-whitespace prev char\n for (; j >= 0; j--) {\n p = exp.charAt(j);\n if (p !== ' ') { break }\n }\n if (!p || !/[\\w$]/.test(p)) {\n inRegex = true;\n }\n }\n }\n }\n\n if (expression === undefined) {\n expression = exp.slice(0, i).trim();\n } else if (lastFilterIndex !== 0) {\n pushFilter();\n }\n\n function pushFilter () {\n (filters || (filters = [])).push(exp.slice(lastFilterIndex, i).trim());\n lastFilterIndex = i + 1;\n }\n\n if (filters) {\n for (i = 0; i < filters.length; i++) {\n expression = wrapFilter(expression, filters[i]);\n }\n }\n\n return expression\n}\n\nfunction wrapFilter (exp, filter) {\n var i = filter.indexOf('(');\n if (i < 0) {\n // _f: resolveFilter\n return (\"_f(\\\"\" + filter + \"\\\")(\" + exp + \")\")\n } else {\n var name = filter.slice(0, i);\n var args = filter.slice(i + 1);\n return (\"_f(\\\"\" + name + \"\\\")(\" + exp + \",\" + args)\n }\n}\n\n/* */\n\nvar defaultTagRE = /\\{\\{((?:.|\\n)+?)\\}\\}/g;\nvar regexEscapeRE = /[-.*+?^${}()|[\\]\\/\\\\]/g;\n\nvar buildRegex = cached(function (delimiters) {\n var open = delimiters[0].replace(regexEscapeRE, '\\\\$&');\n var close = delimiters[1].replace(regexEscapeRE, '\\\\$&');\n return new RegExp(open + '((?:.|\\\\n)+?)' + close, 'g')\n});\n\nfunction parseText (\n text,\n delimiters\n) {\n var tagRE = delimiters ? buildRegex(delimiters) : defaultTagRE;\n if (!tagRE.test(text)) {\n return\n }\n var tokens = [];\n var lastIndex = tagRE.lastIndex = 0;\n var match, index;\n while ((match = tagRE.exec(text))) {\n index = match.index;\n // push text token\n if (index > lastIndex) {\n tokens.push(JSON.stringify(text.slice(lastIndex, index)));\n }\n // tag token\n var exp = parseFilters(match[1].trim());\n tokens.push((\"_s(\" + exp + \")\"));\n lastIndex = index + match[0].length;\n }\n if (lastIndex < text.length) {\n tokens.push(JSON.stringify(text.slice(lastIndex)));\n }\n return tokens.join('+')\n}\n\n/* */\n\nfunction baseWarn (msg) {\n console.error((\"[Vue parser]: \" + msg));\n}\n\nfunction pluckModuleFunction (\n modules,\n key\n) {\n return modules\n ? modules.map(function (m) { return m[key]; }).filter(function (_) { return _; })\n : []\n}\n\nfunction addProp (el, name, value) {\n (el.props || (el.props = [])).push({ name: name, value: value });\n}\n\nfunction addAttr (el, name, value) {\n (el.attrs || (el.attrs = [])).push({ name: name, value: value });\n}\n\nfunction addDirective (\n el,\n name,\n rawName,\n value,\n arg,\n modifiers\n) {\n (el.directives || (el.directives = [])).push({ name: name, rawName: rawName, value: value, arg: arg, modifiers: modifiers });\n}\n\nfunction addHandler (\n el,\n name,\n value,\n modifiers,\n important\n) {\n // check capture modifier\n if (modifiers && modifiers.capture) {\n delete modifiers.capture;\n name = '!' + name; // mark the event as captured\n }\n if (modifiers && modifiers.once) {\n delete modifiers.once;\n name = '~' + name; // mark the event as once\n }\n var events;\n if (modifiers && modifiers.native) {\n delete modifiers.native;\n events = el.nativeEvents || (el.nativeEvents = {});\n } else {\n events = el.events || (el.events = {});\n }\n var newHandler = { value: value, modifiers: modifiers };\n var handlers = events[name];\n /* istanbul ignore if */\n if (Array.isArray(handlers)) {\n important ? handlers.unshift(newHandler) : handlers.push(newHandler);\n } else if (handlers) {\n events[name] = important ? [newHandler, handlers] : [handlers, newHandler];\n } else {\n events[name] = newHandler;\n }\n}\n\nfunction getBindingAttr (\n el,\n name,\n getStatic\n) {\n var dynamicValue =\n getAndRemoveAttr(el, ':' + name) ||\n getAndRemoveAttr(el, 'v-bind:' + name);\n if (dynamicValue != null) {\n return parseFilters(dynamicValue)\n } else if (getStatic !== false) {\n var staticValue = getAndRemoveAttr(el, name);\n if (staticValue != null) {\n return JSON.stringify(staticValue)\n }\n }\n}\n\nfunction getAndRemoveAttr (el, name) {\n var val;\n if ((val = el.attrsMap[name]) != null) {\n var list = el.attrsList;\n for (var i = 0, l = list.length; i < l; i++) {\n if (list[i].name === name) {\n list.splice(i, 1);\n break\n }\n }\n }\n return val\n}\n\nvar len;\nvar str;\nvar chr;\nvar index$1;\nvar expressionPos;\nvar expressionEndPos;\n\n/**\n * parse directive model to do the array update transform. a[idx] = val => $$a.splice($$idx, 1, val)\n *\n * for loop possible cases:\n *\n * - test\n * - test[idx]\n * - test[test1[idx]]\n * - test[\"a\"][idx]\n * - xxx.test[a[a].test1[idx]]\n * - test.xxx.a[\"asa\"][test1[idx]]\n *\n */\n\nfunction parseModel (val) {\n str = val;\n len = str.length;\n index$1 = expressionPos = expressionEndPos = 0;\n\n if (val.indexOf('[') < 0 || val.lastIndexOf(']') < len - 1) {\n return {\n exp: val,\n idx: null\n }\n }\n\n while (!eof()) {\n chr = next();\n /* istanbul ignore if */\n if (isStringStart(chr)) {\n parseString(chr);\n } else if (chr === 0x5B) {\n parseBracket(chr);\n }\n }\n\n return {\n exp: val.substring(0, expressionPos),\n idx: val.substring(expressionPos + 1, expressionEndPos)\n }\n}\n\nfunction next () {\n return str.charCodeAt(++index$1)\n}\n\nfunction eof () {\n return index$1 >= len\n}\n\nfunction isStringStart (chr) {\n return chr === 0x22 || chr === 0x27\n}\n\nfunction parseBracket (chr) {\n var inBracket = 1;\n expressionPos = index$1;\n while (!eof()) {\n chr = next();\n if (isStringStart(chr)) {\n parseString(chr);\n continue\n }\n if (chr === 0x5B) { inBracket++; }\n if (chr === 0x5D) { inBracket--; }\n if (inBracket === 0) {\n expressionEndPos = index$1;\n break\n }\n }\n}\n\nfunction parseString (chr) {\n var stringQuote = chr;\n while (!eof()) {\n chr = next();\n if (chr === stringQuote) {\n break\n }\n }\n}\n\n/* */\n\nvar dirRE = /^v-|^@|^:/;\nvar forAliasRE = /(.*?)\\s+(?:in|of)\\s+(.*)/;\nvar forIteratorRE = /\\((\\{[^}]*\\}|[^,]*),([^,]*)(?:,([^,]*))?\\)/;\nvar bindRE = /^:|^v-bind:/;\nvar onRE = /^@|^v-on:/;\nvar argRE = /:(.*)$/;\nvar modifierRE = /\\.[^.]+/g;\n\nvar decodeHTMLCached = cached(decode);\n\n// configurable state\nvar warn$1;\nvar platformGetTagNamespace;\nvar platformMustUseProp;\nvar platformIsPreTag;\nvar preTransforms;\nvar transforms;\nvar postTransforms;\nvar delimiters;\n\n/**\n * Convert HTML string to AST.\n */\nfunction parse (\n template,\n options\n) {\n warn$1 = options.warn || baseWarn;\n platformGetTagNamespace = options.getTagNamespace || no;\n platformMustUseProp = options.mustUseProp || no;\n platformIsPreTag = options.isPreTag || no;\n preTransforms = pluckModuleFunction(options.modules, 'preTransformNode');\n transforms = pluckModuleFunction(options.modules, 'transformNode');\n postTransforms = pluckModuleFunction(options.modules, 'postTransformNode');\n delimiters = options.delimiters;\n var stack = [];\n var preserveWhitespace = options.preserveWhitespace !== false;\n var root;\n var currentParent;\n var inVPre = false;\n var inPre = false;\n var warned = false;\n parseHTML(template, {\n expectHTML: options.expectHTML,\n isUnaryTag: options.isUnaryTag,\n shouldDecodeNewlines: options.shouldDecodeNewlines,\n start: function start (tag, attrs, unary) {\n // check namespace.\n // inherit parent ns if there is one\n var ns = (currentParent && currentParent.ns) || platformGetTagNamespace(tag);\n\n // handle IE svg bug\n /* istanbul ignore if */\n if (isIE && ns === 'svg') {\n attrs = guardIESVGBug(attrs);\n }\n\n var element = {\n type: 1,\n tag: tag,\n attrsList: attrs,\n attrsMap: makeAttrsMap(attrs),\n parent: currentParent,\n children: []\n };\n if (ns) {\n element.ns = ns;\n }\n\n if (isForbiddenTag(element) && !isServerRendering()) {\n element.forbidden = true;\n \"production\" !== 'production' && warn$1(\n 'Templates should only be responsible for mapping the state to the ' +\n 'UI. Avoid placing tags with side-effects in your templates, such as ' +\n \"<\" + tag + \">\" + ', as they will not be parsed.'\n );\n }\n\n // apply pre-transforms\n for (var i = 0; i < preTransforms.length; i++) {\n preTransforms[i](element, options);\n }\n\n if (!inVPre) {\n processPre(element);\n if (element.pre) {\n inVPre = true;\n }\n }\n if (platformIsPreTag(element.tag)) {\n inPre = true;\n }\n if (inVPre) {\n processRawAttrs(element);\n } else {\n processFor(element);\n processIf(element);\n processOnce(element);\n processKey(element);\n\n // determine whether this is a plain element after\n // removing structural attributes\n element.plain = !element.key && !attrs.length;\n\n processRef(element);\n processSlot(element);\n processComponent(element);\n for (var i$1 = 0; i$1 < transforms.length; i$1++) {\n transforms[i$1](element, options);\n }\n processAttrs(element);\n }\n\n function checkRootConstraints (el) {\n if (false) {\n if (el.tag === 'slot' || el.tag === 'template') {\n warned = true;\n warn$1(\n \"Cannot use <\" + (el.tag) + \"> as component root element because it may \" +\n 'contain multiple nodes:\\n' + template\n );\n }\n if (el.attrsMap.hasOwnProperty('v-for')) {\n warned = true;\n warn$1(\n 'Cannot use v-for on stateful component root element because ' +\n 'it renders multiple elements:\\n' + template\n );\n }\n }\n }\n\n // tree management\n if (!root) {\n root = element;\n checkRootConstraints(root);\n } else if (!stack.length) {\n // allow root elements with v-if, v-else-if and v-else\n if (root.if && (element.elseif || element.else)) {\n checkRootConstraints(element);\n addIfCondition(root, {\n exp: element.elseif,\n block: element\n });\n } else if (false) {\n warned = true;\n warn$1(\n \"Component template should contain exactly one root element:\" +\n \"\\n\\n\" + template + \"\\n\\n\" +\n \"If you are using v-if on multiple elements, \" +\n \"use v-else-if to chain them instead.\"\n );\n }\n }\n if (currentParent && !element.forbidden) {\n if (element.elseif || element.else) {\n processIfConditions(element, currentParent);\n } else if (element.slotScope) { // scoped slot\n currentParent.plain = false;\n var name = element.slotTarget || 'default';(currentParent.scopedSlots || (currentParent.scopedSlots = {}))[name] = element;\n } else {\n currentParent.children.push(element);\n element.parent = currentParent;\n }\n }\n if (!unary) {\n currentParent = element;\n stack.push(element);\n }\n // apply post-transforms\n for (var i$2 = 0; i$2 < postTransforms.length; i$2++) {\n postTransforms[i$2](element, options);\n }\n },\n\n end: function end () {\n // remove trailing whitespace\n var element = stack[stack.length - 1];\n var lastNode = element.children[element.children.length - 1];\n if (lastNode && lastNode.type === 3 && lastNode.text === ' ') {\n element.children.pop();\n }\n // pop stack\n stack.length -= 1;\n currentParent = stack[stack.length - 1];\n // check pre state\n if (element.pre) {\n inVPre = false;\n }\n if (platformIsPreTag(element.tag)) {\n inPre = false;\n }\n },\n\n chars: function chars (text) {\n if (!currentParent) {\n if (false) {\n warned = true;\n warn$1(\n 'Component template requires a root element, rather than just text:\\n\\n' + template\n );\n }\n return\n }\n // IE textarea placeholder bug\n /* istanbul ignore if */\n if (isIE &&\n currentParent.tag === 'textarea' &&\n currentParent.attrsMap.placeholder === text) {\n return\n }\n var children = currentParent.children;\n text = inPre || text.trim()\n ? decodeHTMLCached(text)\n // only preserve whitespace if its not right after a starting tag\n : preserveWhitespace && children.length ? ' ' : '';\n if (text) {\n var expression;\n if (!inVPre && text !== ' ' && (expression = parseText(text, delimiters))) {\n children.push({\n type: 2,\n expression: expression,\n text: text\n });\n } else if (text !== ' ' || children[children.length - 1].text !== ' ') {\n currentParent.children.push({\n type: 3,\n text: text\n });\n }\n }\n }\n });\n return root\n}\n\nfunction processPre (el) {\n if (getAndRemoveAttr(el, 'v-pre') != null) {\n el.pre = true;\n }\n}\n\nfunction processRawAttrs (el) {\n var l = el.attrsList.length;\n if (l) {\n var attrs = el.attrs = new Array(l);\n for (var i = 0; i < l; i++) {\n attrs[i] = {\n name: el.attrsList[i].name,\n value: JSON.stringify(el.attrsList[i].value)\n };\n }\n } else if (!el.pre) {\n // non root node in pre blocks with no attributes\n el.plain = true;\n }\n}\n\nfunction processKey (el) {\n var exp = getBindingAttr(el, 'key');\n if (exp) {\n if (false) {\n warn$1(\"