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account/theme/pages/plugins/codemirror/mode/yaml-frontmatter/yaml-frontmatter.js

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+// CodeMirror, copyright (c) by Marijn Haverbeke and others
+// Distributed under an MIT license: https://codemirror.net/LICENSE
+
+(function (mod) {
+  if (typeof exports == "object" && typeof module == "object") // CommonJS
+    mod(require("../../lib/codemirror"), require("../yaml/yaml"))
+  else if (typeof define == "function" && define.amd) // AMD
+    define(["../../lib/codemirror", "../yaml/yaml"], mod)
+  else // Plain browser env
+    mod(CodeMirror)
+})(function (CodeMirror) {
+
+  var START = 0, FRONTMATTER = 1, BODY = 2
+
+  // a mixed mode for Markdown text with an optional YAML front matter
+  CodeMirror.defineMode("yaml-frontmatter", function (config, parserConfig) {
+    var yamlMode = CodeMirror.getMode(config, "yaml")
+    var innerMode = CodeMirror.getMode(config, parserConfig && parserConfig.base || "gfm")
+
+    function localMode(state) {
+      return state.state == FRONTMATTER ? {mode: yamlMode, state: state.yaml} : {mode: innerMode, state: state.inner}
+    }
+
+    return {
+      startState: function () {
+        return {
+          state: START,
+          yaml: null,
+          inner: CodeMirror.startState(innerMode)
+        }
+      },
+      copyState: function (state) {
+        return {
+          state: state.state,
+          yaml: state.yaml && CodeMirror.copyState(yamlMode, state.yaml),
+          inner: CodeMirror.copyState(innerMode, state.inner)
+        }
+      },
+      token: function (stream, state) {
+        if (state.state == START) {
+          if (stream.match('---', false)) {
+            state.state = FRONTMATTER
+            state.yaml = CodeMirror.startState(yamlMode)
+            return yamlMode.token(stream, state.yaml)
+          } else {
+            state.state = BODY
+            return innerMode.token(stream, state.inner)
+          }
+        } else if (state.state == FRONTMATTER) {
+          var end = stream.sol() && stream.match(/(---|\.\.\.)/, false)
+          var style = yamlMode.token(stream, state.yaml)
+          if (end) {
+            state.state = BODY
+            state.yaml = null
+          }
+          return style
+        } else {
+          return innerMode.token(stream, state.inner)
+        }
+      },
+      innerMode: localMode,
+      indent: function(state, a, b) {
+        var m = localMode(state)
+        return m.mode.indent ? m.mode.indent(m.state, a, b) : CodeMirror.Pass
+      },
+      blankLine: function (state) {
+        var m = localMode(state)
+        if (m.mode.blankLine) return m.mode.blankLine(m.state)
+      }
+    }
+  })
+});