Merge pull request #262 from com-junkawasaki/docs/japanese-chapters

docs: add Japanese translations for all chapters

2 files changed, 50 insertions, 1 deletions

diff --git a/chapter02/docs/02-grammar.ja.md b/chapter02/docs/02-grammar.ja.md
new file mode 100644
index 00000000..c08359e3
--- /dev/null
+++ b/chapter02/docs/02-grammar.ja.md
@@ -0,0 +1,47 @@
+# 第2章の文法
+
+[English](02-grammar.md) | 日本語
+
+この文書は [第2章の文法定義](02-grammar.md) の日本語版です。
+文法定義そのものは原文と同一です。
+
+[第2章：算術演算に戻る](../README.ja.md)
+
+```antlrv4
+grammar SimpleLanguage;
+
+program
+    : statement EOF
+    ;
+
+statement
+    : 'return' expression ';'
+    ;
+
+expression
+    : additiveExpression
+    ;
+
+additiveExpression
+    : multiplicativeExpression (('+' | '-') multiplicativeExpression)*
+    ;
+
+multiplicativeExpression
+    : unaryExpression (('*' | '/') unaryExpression)*
+    ;
+
+unaryExpression
+    : ('-') unaryExpression
+    | primaryExpression
+    ;
+
+primaryExpression
+    : INTEGER_LITERAL
+    | '(' expression ')'
+    ;
+
+INTEGER_LITERAL
+    : [1-9][0-9]*
+    | [0]
+    ;
+```
diff --git a/chapter02/docs/02-grammar.md b/chapter02/docs/02-grammar.md
index ce875eda..994a398a 100644
--- a/chapter02/docs/02-grammar.md
+++ b/chapter02/docs/02-grammar.md
@@ -1,4 +1,6 @@
-# Grammar for Chapter 1
+# Grammar for Chapter 2
+
+English | [日本語](02-grammar.ja.md)
 
 ```antlrv4
 grammar SimpleLanguage;