doc/md: a detailed tutorial on the gRPC integration (#1663)

doc/website/src/theme/prism-include-languages.js

@@ -34,4 +34,45 @@ export default function(Prism) {
     'builtin': /\b(?:bool|byte|complex(?:64|128)|error|float(?:32|64)|rune|string|u?int(?:8|16|32|64)?|uintptr|append|cap|close|complex|copy|delete|imag|len|make|new|panic|print(?:ln)?|real|recover)\b/,
     'keyword': /\b(?:break|default|func|interface|select|case|map|struct|chan|else|goto|package|switch|const|fallthrough|if|range|type|continue|for|import|return|var|go|defer|bool|byte|complex64|complex128|float32|float64|int8|int16|int32|int64|string|uint8|uint16|uint32|uint64|int|uint|uintptr|rune|with|define|block|end)\b/,
   };
+
+  Prism.languages.protobuf = Prism.languages.extend('clike', {
+    'class-name': [
+      {
+        pattern: /(\b(?:enum|extend|message|service)\s+)[A-Za-z_]\w*(?=\s*\{)/,
+        lookbehind: true
+      },
+      {
+        pattern: /(\b(?:rpc\s+\w+|returns)\s*\(\s*(?:stream\s+)?)\.?[A-Za-z_]\w*(?:\.[A-Za-z_]\w*)*(?=\s*\))/,
+        lookbehind: true
+      }
+    ],
+    'keyword': /\b(?:enum|extend|extensions|import|message|oneof|option|optional|package|public|repeated|required|reserved|returns|rpc(?=\s+\w)|service|stream|syntax|to)\b(?!\s*=\s*\d)/,
+    'function': /\b[a-z_]\w*(?=\s*\()/i
+  });
+
+  var builtinTypes = /\b(?:double|float|[su]?int(?:32|64)|s?fixed(?:32|64)|bool|string|bytes)\b/;
+
+  Prism.languages.insertBefore('protobuf', 'operator', {
+    'map': {
+      pattern: /\bmap<\s*[\w.]+\s*,\s*[\w.]+\s*>(?=\s+[a-z_]\w*\s*[=;])/i,
+      alias: 'class-name',
+      inside: {
+        'punctuation': /[<>.,]/,
+        'builtin': builtinTypes
+      }
+    },
+    'builtin': builtinTypes,
+    'positional-class-name': {
+      pattern: /(?:\b|\B\.)[a-z_]\w*(?:\.[a-z_]\w*)*(?=\s+[a-z_]\w*\s*[=;])/i,
+      alias: 'class-name',
+      inside: {
+        'punctuation': /\./
+      }
+    },
+    'annotation': {
+      pattern: /(\[\s*)[a-z_]\w*(?=\s*=)/i,
+      lookbehind: true
+    }
+  });
+
 }