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135 lines
3.9 KiB
135 lines
3.9 KiB
use crate::generator::Generator; |
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use crate::parser::node_type::*; |
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pub struct JsGenerator; |
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impl Generator for JsGenerator { |
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fn generate(prog: Program) -> String { |
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let mut code = prog |
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.func |
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.into_iter() |
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.map(|f| generate_function(f)) |
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.collect(); |
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// Until we have a stdlib, it should suffice to print the result of main to stdout |
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code += "console.log(main())"; |
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return code; |
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} |
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} |
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fn generate_function(func: Function) -> String { |
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let arguments: String = func |
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.arguments |
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.into_iter() |
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.map(|var| var.name) |
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.collect::<Vec<String>>() |
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.join(", "); |
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let mut raw = format!("function {N}({A})", N = func.name, A = arguments); |
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raw += " {\n"; |
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for statement in func.statements { |
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raw += &generate_statement(statement); |
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} |
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raw += "}\n"; |
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raw |
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} |
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fn generate_statement(statement: Statement) -> String { |
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match statement { |
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Statement::Return(ret) => generate_return(ret), |
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Statement::Declare(name, val) => generate_declare(name.name, val), |
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Statement::Exp(val) => generate_expression(val), |
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Statement::If(expr, if_state, else_state) => { |
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generate_conditional(expr, if_state, else_state.map(|x| *x)) |
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} |
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Statement::While(_, _) => todo!(), |
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} |
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} |
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fn generate_expression(expr: Expression) -> String { |
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match expr { |
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Expression::Int(val) => val.to_string(), |
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Expression::Variable(val) | Expression::Str(val) => val, |
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Expression::Char(_) => todo!(), |
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Expression::FunctionCall(name, e) => generate_function_call(name, e), |
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Expression::Assign(_, _) => todo!(), |
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Expression::BinOp(left, op, right) => generate_bin_op(*left, op, *right), |
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} |
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} |
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fn generate_conditional( |
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expr: Expression, |
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if_state: Vec<Statement>, |
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else_state: Option<Statement>, |
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) -> String { |
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let expr_str = generate_expression(expr); |
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let mut outcome = format!("if ({})", expr_str); |
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outcome += "{\n"; |
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for statement in if_state { |
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outcome += &generate_statement(statement); |
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} |
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outcome += "}"; |
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outcome |
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} |
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fn generate_declare(name: String, val: Option<Expression>) -> String { |
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// var is used here to not collide with scopes. |
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// TODO: Can let be used instead? |
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match val { |
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Some(expr) => format!("var {} = {};", name, generate_expression(expr)), |
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None => format!("var {};", name), |
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} |
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} |
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fn generate_function_call(func: String, args: Vec<Expression>) -> String { |
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let formatted_args = args |
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.into_iter() |
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.map(|arg| match arg { |
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Expression::Char(c) => c.to_string(), |
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Expression::Int(i) => i.to_string(), |
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Expression::FunctionCall(n, a) => generate_function_call(n, a), |
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Expression::Str(s) | Expression::Variable(s) => s, |
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Expression::Assign(_, _) => todo!(), |
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Expression::BinOp(left, op, right) => generate_bin_op(*left, op, *right), |
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}) |
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.collect::<Vec<String>>() |
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.join(","); |
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format!("{N}({A})\n", N = func, A = formatted_args) |
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} |
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fn generate_return(ret: Option<Expression>) -> String { |
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match ret { |
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Some(expr) => format!("return {}\n", generate_expression(expr)), |
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None => "return;\n".to_string(), |
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} |
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} |
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fn generate_bin_op(left: Expression, op: BinOp, right: Expression) -> String { |
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let op_str = match op { |
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BinOp::Addition => "+", |
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BinOp::And => "&&", |
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BinOp::Division => "/", |
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BinOp::Equal => "===", |
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BinOp::GreaterThan => ">", |
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BinOp::GreaterThanOrEqual => ">=", |
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BinOp::LessThan => "<", |
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BinOp::LessThanOrEqual => "<=", |
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BinOp::Modulus => "%", |
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BinOp::Multiplication => "*", |
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BinOp::NotEqual => "!==", |
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BinOp::Or => "||", |
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BinOp::Subtraction => "-", |
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}; |
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format!( |
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"{l} {op} {r}", |
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l = generate_expression(left), |
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op = op_str, |
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r = generate_expression(right) |
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) |
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}
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