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state.interpolationStack.length : 0;\n }\n\n CodeMirror.defineMIME(\"application/dart\", {\n name: \"clike\",\n keywords: set(keywords),\n blockKeywords: set(blockKeywords),\n builtin: set(builtins),\n atoms: set(atoms),\n hooks: {\n \"@\": function(stream) {\n stream.eatWhile(/[\\w\\$_\\.]/);\n return \"meta\";\n },\n\n // custom string handling to deal with triple-quoted strings and string interpolation\n \"'\": function(stream, state) {\n return tokenString(\"'\", stream, state, false);\n },\n \"\\\"\": function(stream, state) {\n return tokenString(\"\\\"\", stream, state, false);\n },\n \"r\": function(stream, state) {\n var peek = stream.peek();\n if (peek == \"'\" || peek == \"\\\"\") {\n return tokenString(stream.next(), stream, state, true);\n }\n return false;\n },\n\n \"}\": function(_stream, state) {\n // \"}\" is end of interpolation, if interpolation stack is non-empty\n if (sizeInterpolationStack(state) > 0) {\n state.tokenize = popInterpolationStack(state);\n return null;\n }\n return false;\n },\n\n \"/\": function(stream, state) {\n if (!stream.eat(\"*\")) return false\n state.tokenize = tokenNestedComment(1)\n return state.tokenize(stream, state)\n },\n token: function(stream, _, style) {\n if (style == \"variable\") {\n // Assume uppercase symbols are classes using variable-2\n var isUpper = RegExp('^[_$]*[A-Z][a-zA-Z0-9_$]*$','g');\n if (isUpper.test(stream.current())) {\n return 'variable-2';\n }\n }\n }\n }\n });\n\n function tokenString(quote, stream, state, raw) {\n var tripleQuoted = false;\n if (stream.eat(quote)) {\n if (stream.eat(quote)) tripleQuoted = true;\n else return \"string\"; //empty string\n }\n function tokenStringHelper(stream, state) {\n var escaped = false;\n while (!stream.eol()) {\n if (!raw && !escaped && stream.peek() == \"$\") {\n pushInterpolationStack(state);\n state.tokenize = tokenInterpolation;\n return \"string\";\n }\n var next = stream.next();\n if (next == quote && !escaped && (!tripleQuoted || stream.match(quote + quote))) {\n state.tokenize = null;\n break;\n }\n escaped = !raw && !escaped && next == \"\\\\\";\n }\n return \"string\";\n }\n state.tokenize = tokenStringHelper;\n return tokenStringHelper(stream, state);\n }\n\n function tokenInterpolation(stream, state) {\n stream.eat(\"$\");\n if (stream.eat(\"{\")) {\n // let clike handle the content of ${...},\n // we take over again when \"}\" appears (see hooks).\n state.tokenize = null;\n } else {\n state.tokenize = tokenInterpolationIdentifier;\n }\n return null;\n }\n\n function tokenInterpolationIdentifier(stream, state) {\n stream.eatWhile(/[\\w_]/);\n state.tokenize = popInterpolationStack(state);\n return \"variable\";\n }\n\n function tokenNestedComment(depth) {\n return function (stream, state) {\n var ch\n while (ch = stream.next()) {\n if (ch == \"*\" && stream.eat(\"/\")) {\n if (depth == 1) {\n state.tokenize = null\n break\n } else {\n state.tokenize = tokenNestedComment(depth - 1)\n return state.tokenize(stream, state)\n }\n } else if (ch == \"/\" && stream.eat(\"*\")) {\n state.tokenize = tokenNestedComment(depth + 1)\n return state.tokenize(stream, state)\n }\n }\n return \"comment\"\n }\n }\n\n CodeMirror.registerHelper(\"hintWords\", \"application/dart\", keywords.concat(atoms).concat(builtins));\n\n // This is needed to make loading through meta.js work.\n CodeMirror.defineMode(\"dart\", function(conf) {\n return CodeMirror.getMode(conf, \"application/dart\");\n }, \"clike\");\n});\n"]}