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// CodeMirror, copyright (c) by Marijn Haverbeke and others

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// Distributed under an MIT license: http://codemirror.net/LICENSE

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(function (mod) {

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if (typeof exports == "object" && typeof module == "object") // CommonJS

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mod(require("../../lib/codemirror"), require("../yaml/yaml"))

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else if (typeof define == "function" && define.amd) // AMD

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define(["../../lib/codemirror", "../yaml/yaml"], mod)

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else // Plain browser env

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mod(CodeMirror)

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})(function (CodeMirror) {

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var START = 0, FRONTMATTER = 1, BODY = 2

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// a mixed mode for Markdown text with an optional YAML front matter

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CodeMirror.defineMode("yaml-frontmatter", function (config, parserConfig) {

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var yamlMode = CodeMirror.getMode(config, "yaml")

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var innerMode = CodeMirror.getMode(config, parserConfig && parserConfig.base || "gfm")

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function curMode(state) {

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return state.state == BODY ? innerMode : yamlMode

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}

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return {

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startState: function () {

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return {

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state: START,

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inner: CodeMirror.startState(yamlMode)

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}

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copyState: function (state) {

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return {

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state: state.state,

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inner: CodeMirror.copyState(curMode(state), state.inner)

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}

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token: function (stream, state) {

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if (state.state == START) {

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if (stream.match(/---/, false)) {

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state.state = FRONTMATTER

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return yamlMode.token(stream, state.inner)

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} else {

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state.state = BODY

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state.inner = CodeMirror.startState(innerMode)

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return innerMode.token(stream, state.inner)

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}

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} else if (state.state == FRONTMATTER) {

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var end = stream.sol() && stream.match(/---/, false)

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var style = yamlMode.token(stream, state.inner)

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if (end) {

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state.state = BODY

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state.inner = CodeMirror.startState(innerMode)

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}

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return style

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} else {

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return innerMode.token(stream, state.inner)

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}

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innerMode: function (state) {

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return {mode: curMode(state), state: state.inner}

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blankLine: function (state) {

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var mode = curMode(state)

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if (mode.blankLine) return mode.blankLine(state.inner)

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}

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}

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})

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});

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