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LibJS: Implement "else" parsing
We can now handle scripts with if/else in LibJS. Most of the changes are about fixing IfStatement to store the consequent and alternate node as Statements. Interpreter now also runs Statements, rather than running ScopeNodes.
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commit
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5 changed files with 31 additions and 16 deletions
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@ -26,11 +26,11 @@
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#pragma once
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#include <AK/FlyString.h>
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#include <AK/HashMap.h>
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#include <AK/NonnullRefPtrVector.h>
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#include <AK/RefPtr.h>
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#include <AK/String.h>
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#include <AK/FlyString.h>
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#include <AK/Vector.h>
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#include <LibJS/Forward.h>
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#include <LibJS/Runtime/Value.h>
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@ -52,6 +52,7 @@ public:
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virtual void dump(int indent) const;
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virtual bool is_identifier() const { return false; }
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virtual bool is_member_expression() const { return false; }
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virtual bool is_scope_node() const { return false; }
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protected:
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ASTNode() {}
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@ -107,6 +108,7 @@ protected:
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ScopeNode() {}
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private:
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virtual bool is_scope_node() const final { return true; }
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NonnullRefPtrVector<Statement> m_children;
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};
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@ -212,7 +214,7 @@ private:
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class IfStatement : public Statement {
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public:
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IfStatement(NonnullRefPtr<Expression> predicate, NonnullRefPtr<ScopeNode> consequent, RefPtr<ScopeNode> alternate)
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IfStatement(NonnullRefPtr<Expression> predicate, NonnullRefPtr<Statement> consequent, RefPtr<Statement> alternate)
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: m_predicate(move(predicate))
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, m_consequent(move(consequent))
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, m_alternate(move(alternate))
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@ -220,8 +222,8 @@ public:
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}
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const Expression& predicate() const { return *m_predicate; }
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const ScopeNode& consequent() const { return *m_consequent; }
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const ScopeNode* alternate() const { return m_alternate; }
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const Statement& consequent() const { return *m_consequent; }
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const Statement* alternate() const { return m_alternate; }
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virtual Value execute(Interpreter&) const override;
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virtual void dump(int indent) const override;
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@ -230,8 +232,8 @@ private:
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virtual const char* class_name() const override { return "IfStatement"; }
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NonnullRefPtr<Expression> m_predicate;
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NonnullRefPtr<ScopeNode> m_consequent;
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RefPtr<ScopeNode> m_alternate;
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NonnullRefPtr<Statement> m_consequent;
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RefPtr<Statement> m_alternate;
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};
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class WhileStatement : public Statement {
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