1// CodeMirror, copyright (c) by Marijn Haverbeke and others
 2// Distributed under an MIT license: https://codemirror.net/LICENSE
 3
 4(function (mod) {
 5  if (typeof exports == "object" && typeof module == "object") // CommonJS
 6    mod(require("../../lib/codemirror"), require("../yaml/yaml"))
 7  else if (typeof define == "function" && define.amd) // AMD
 8    define(["../../lib/codemirror", "../yaml/yaml"], mod)
 9  else // Plain browser env
10    mod(CodeMirror)
11})(function (CodeMirror) {
12
13  var START = 0, FRONTMATTER = 1, BODY = 2
14
15  // a mixed mode for Markdown text with an optional YAML front matter
16  CodeMirror.defineMode("yaml-frontmatter", function (config, parserConfig) {
17    var yamlMode = CodeMirror.getMode(config, "yaml")
18    var innerMode = CodeMirror.getMode(config, parserConfig && parserConfig.base || "gfm")
19
20    function curMode(state) {
21      return state.state == BODY ? innerMode : yamlMode
22    }
23
24    return {
25      startState: function () {
26        return {
27          state: START,
28          inner: CodeMirror.startState(yamlMode)
29        }
30      },
31      copyState: function (state) {
32        return {
33          state: state.state,
34          inner: CodeMirror.copyState(curMode(state), state.inner)
35        }
36      },
37      token: function (stream, state) {
38        if (state.state == START) {
39          if (stream.match(/---/, false)) {
40            state.state = FRONTMATTER
41            return yamlMode.token(stream, state.inner)
42          } else {
43            state.state = BODY
44            state.inner = CodeMirror.startState(innerMode)
45            return innerMode.token(stream, state.inner)
46          }
47        } else if (state.state == FRONTMATTER) {
48          var end = stream.sol() && stream.match(/(---|\.\.\.)/, false)
49          var style = yamlMode.token(stream, state.inner)
50          if (end) {
51            state.state = BODY
52            state.inner = CodeMirror.startState(innerMode)
53          }
54          return style
55        } else {
56          return innerMode.token(stream, state.inner)
57        }
58      },
59      innerMode: function (state) {
60        return {mode: curMode(state), state: state.inner}
61      },
62      blankLine: function (state) {
63        var mode = curMode(state)
64        if (mode.blankLine) return mode.blankLine(state.inner)
65      }
66    }
67  })
68});