add docker for grammar generate.

Author: cloudwebrtc

Makefile

@@ -0,0 +1,7 @@
+all: peg grammar
+
+peg:
+	docker build -t peg-tool tool
+
+grammar:
+	docker run -it --rm -v `pwd`/lib/src:/src --platform linux/amd64 peg-tool

tool/Dockerfile

@@ -0,0 +1,10 @@
+FROM google/dart:1.24.3
+
+WORKDIR /tool
+RUN git clone https://github.com/cloudwebrtc/peg && \
+    cd peg && \
+    pub get && \
+    pub global activate --source path .
+
+WORKDIR /src
+CMD ["dart", "/tool/peg/bin/peg.dart", "general", "/src/grammar.peg"]

tool/README.md

@@ -1,9 +1,10 @@
-## NOTE
+# NOTE
 
 `grammar_parser.dart` is generated from `grammar.peg` using the [peg](https://github.com/cloudwebrtc/peg) tool.
 Since the peg tool does not support `dart 2.x`, you need to use `dart 1.24.3`.
 
-# Generate steps:
+## Generate steps
+
 - Install `Dart 1.24.3`.
 
   `brew install dart@1`
@@ -22,4 +23,13 @@ Since the peg tool does not support `dart 2.x`, you need to use `dart 1.24.3`.
 
 - Generate grammar parser
 
-  `./tool/generate_grammar.sh`
+  `./tool/generate_grammar.sh`
+
+## or use Docker
+
+- Install `Docker`.
+
+- Generate grammar parser
+  `git clone https://github.com/flutter-webrtc/dart-sip-ua`
+  `cd dart-sip-ua`
+  `make peg && make grammar`