55 lines
963 B
Go
55 lines
963 B
Go
package ast
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import "gointerpreter/token"
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type Node interface {
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TokenLiteral() string
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}
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type Statement interface {
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Node
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statementNode()
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}
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type Expression interface {
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Node
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expressionNode()
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}
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type Program struct {
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Statements []Statement
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}
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func (p *Program) TokenLiteral() string {
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if len(p.Statements) > 0 {
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return p.Statements[0].TokenLiteral()
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}
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return ""
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}
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type LetStatement struct {
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Token token.Token
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Name *Identifier
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Value Expression
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}
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func (ls *LetStatement) statementNode() {}
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func (ls *LetStatement) TokenLiteral() string { return ls.Token.Literal }
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type Identifier struct {
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Token token.Token
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Value string
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}
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func (i *Identifier) expressionNode() {}
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func (i *Identifier) TokenLiteral() string { return i.Token.Literal }
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type ReturnStatement struct {
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Token token.Token
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Value Expression
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}
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func (rs *ReturnStatement) statementNode() {}
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func (rs *ReturnStatement) TokenLiteral() string { return rs.Token.Literal }
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