GPQAPP

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// CodeMirror, copyright (c) by Marijn Haverbeke and others
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// Distributed under an MIT license: https://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 localMode(state) {
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      return state.state == FRONTMATTER ? {mode: yamlMode, state: state.yaml} : {mode: innerMode, state: state.inner}
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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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          yaml: null,
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          inner: CodeMirror.startState(innerMode)
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        }
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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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          yaml: state.yaml && CodeMirror.copyState(yamlMode, state.yaml),
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          inner: CodeMirror.copyState(innerMode, state.inner)
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        }
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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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            state.yaml = CodeMirror.startState(yamlMode)
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            return yamlMode.token(stream, state.yaml)
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          } else {
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            state.state = BODY
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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.yaml)
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          if (end) {
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            state.state = BODY
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            state.yaml = null
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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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      },
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      innerMode: localMode,
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      indent: function(state, a, b) {
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        var m = localMode(state)
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        return m.mode.indent ? m.mode.indent(m.state, a, b) : CodeMirror.Pass
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      },
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      blankLine: function (state) {
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        var m = localMode(state)
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        if (m.mode.blankLine) return m.mode.blankLine(m.state)
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      }
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    }
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  })
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});
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