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author | Tom Willemse | 2020-11-25 23:10:58 -0800 |
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committer | Tom Willemse | 2020-11-25 23:10:58 -0800 |
commit | ca9fd3ae3a1ef5ca1fbe33a83abb12e656a2556f (patch) | |
tree | 77d16c7e6b87ed0f4472f6a421eeb9496d6f33bc /src/com/craftinginterpreters/lox/Interpreter.java | |
parent | 57e87978ef416ce2898a65a9b67e37be91263e67 (diff) | |
download | crafting-interpreters-ca9fd3ae3a1ef5ca1fbe33a83abb12e656a2556f.tar.gz crafting-interpreters-ca9fd3ae3a1ef5ca1fbe33a83abb12e656a2556f.zip |
Chapter 8: Add blocks and scopes
Diffstat (limited to 'src/com/craftinginterpreters/lox/Interpreter.java')
-rw-r--r-- | src/com/craftinginterpreters/lox/Interpreter.java | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/com/craftinginterpreters/lox/Interpreter.java b/src/com/craftinginterpreters/lox/Interpreter.java index 7378164..e03ca37 100644 --- a/src/com/craftinginterpreters/lox/Interpreter.java +++ b/src/com/craftinginterpreters/lox/Interpreter.java @@ -89,6 +89,26 @@ class Interpreter implements Expr.Visitor<Object>, Stmt.Visitor<Void> { stmt.accept(this); } + private void executeBlock(List<Stmt> statements, Environment environment) { + Environment previous = this.environment; + + try { + this.environment = environment; + + for (Stmt statement : statements) { + execute(statement); + } + } finally { + this.environment = previous; + } + } + + @Override + public Void visitBlockStmt(Stmt.Block stmt) { + executeBlock(stmt.statements, new Environment(environment)); + return null; + } + @Override public Void visitExpressionStmt(Stmt.Expression stmt) { evaluate(stmt.expression); |