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https://github.com/RGBCube/serenity
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LibJS: Add basic support for (scoped) variables
It's now possible to assign expressions to variables. The variables are put into the current scope of the interpreter. Variable lookup follows the scope chain, ending in the global object.
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5 changed files with 224 additions and 19 deletions
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@ -31,24 +31,13 @@
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#include <LibJS/Value.h>
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#include <stdio.h>
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//static void build_program_1(JS::Program&);
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static void build_program_2(JS::Program&);
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int main()
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{
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// function foo() { return (1 + 2) + 3; }
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// foo();
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auto program = make<JS::Program>();
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auto block = make<JS::BlockStatement>();
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block->append<JS::ReturnStatement>(
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make<JS::BinaryExpression>(
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JS::BinaryOp::Plus,
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make<JS::BinaryExpression>(
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JS::BinaryOp::Plus,
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make<JS::Literal>(JS::Value(1)),
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make<JS::Literal>(JS::Value(2))),
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make<JS::Literal>(JS::Value(3))));
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program->append<JS::FunctionDeclaration>("foo", move(block));
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program->append<JS::CallExpression>("foo");
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build_program_2(*program);
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program->dump(0);
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@ -68,3 +57,59 @@ int main()
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interpreter.heap().collect_garbage();
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return 0;
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}
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#if 0
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void build_program_1(JS::Program& program)
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{
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// function foo() { return (1 + 2) + 3; }
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// foo();
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auto block = make<JS::BlockStatement>();
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block->append<JS::ReturnStatement>(
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make<JS::BinaryExpression>(
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JS::BinaryOp::Plus,
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make<JS::BinaryExpression>(
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JS::BinaryOp::Plus,
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make<JS::Literal>(JS::Value(1)),
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make<JS::Literal>(JS::Value(2))),
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make<JS::Literal>(JS::Value(3))));
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program.append<JS::FunctionDeclaration>("foo", move(block));
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program.append<JS::CallExpression>("foo");
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}
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#endif
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void build_program_2(JS::Program& program)
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{
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// c = 1;
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// function foo() {
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// var a = 5;
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// var b = 7;
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// return a + b + c;
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// }
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// foo();
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program.append<JS::AssignmentExpression>(
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JS::AssignmentOp::Assign,
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make<JS::Identifier>("c"),
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make<JS::Literal>(JS::Value(1)));
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auto block = make<JS::BlockStatement>();
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block->append<JS::VariableDeclaration>(
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make<JS::Identifier>("a"),
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make<JS::Literal>(JS::Value(5)));
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block->append<JS::VariableDeclaration>(
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make<JS::Identifier>("b"),
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make<JS::Literal>(JS::Value(7)));
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block->append<JS::ReturnStatement>(
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make<JS::BinaryExpression>(
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JS::BinaryOp::Plus,
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make<JS::BinaryExpression>(
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JS::BinaryOp::Plus,
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make<JS::Identifier>("a"),
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make<JS::Identifier>("b")),
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make<JS::Identifier>("c")));
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program.append<JS::FunctionDeclaration>("foo", move(block));
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program.append<JS::CallExpression>("foo");
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}
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