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use std::fmt; use abc::RenderResult; use incrust::Context; use container::expression::*; pub fn render_expr<'a, 'b, W: fmt::Write>(writer: &mut W, context: &'b Context, expr: &'a DisjExpr) -> RenderResult<()> { let mut itr = expr.list.iter(); match itr.next() { None => unreachable!(), Some(conj) => { render_conj(writer, context, conj)?; for conj in itr { write!(writer, " or ")?; render_conj(writer, context, conj)?; } Ok(()) } } } pub fn render_conj<'a, 'b, W: fmt::Write>(writer: &mut W, context: &'b Context, expr: &'a ConjExpr) -> RenderResult<()> { let mut itr = expr.list.iter(); match itr.next() { None => unreachable!(), Some(cmp) => { render_cmp(writer, context, cmp)?; for cmp in itr { write!(writer, " and ")?; render_cmp(writer, context, cmp)?; } Ok(()) } } } pub fn render_cmp<'a, 'b, W: fmt::Write>(writer: &mut W, context: &'b Context, expr: &'a CmpExpr) -> RenderResult<()> { let mut itr = expr.list.iter(); match itr.next() { None => unreachable!(), Some(&CmpItem(ref _op, ref sum)) => { render_sum(writer, context, sum)?; for &CmpItem(ref op, ref sum) in itr { let op = match *op { CmpOp::Lt => "<", CmpOp::Lte => "<=", CmpOp::Eq => "==", CmpOp::Neq => "!=", CmpOp::In => "in", CmpOp::Nin => "not in", CmpOp::Gte => ">=", CmpOp::Gt => ">", }; write!(writer, " {} ", op)?; render_sum(writer, context, sum)?; } Ok(()) } } } pub fn render_sum<'a, 'b, W: fmt::Write>(writer: &mut W, context: &'b Context, expr: &'a Expr) -> RenderResult<()> { let mut itr = expr.sum.iter(); match itr.next() { None => unreachable!(), Some(&ExprItem(ref _op, ref term)) => { render_prod(writer, context, term)?; for &ExprItem(ref op, ref term) in itr { let op = match *op { SumOp::Add => "+", SumOp::Sub => "-", }; write!(writer, " {} ", op)?; render_prod(writer, context, term)?; } Ok(()) } } } pub fn render_prod<'a, 'b, W: fmt::Write>(writer: &mut W, context: &'b Context, term: &'a Term) -> RenderResult<()> { let mut itr = term.mul.iter(); match itr.next() { None => unreachable!(), Some(&TermItem(ref _op, ref factor)) => { render_factor(writer, context, factor)?; for &TermItem(ref op, ref factor) in itr { let op = match *op { MulOp::Mul => "*", MulOp::Div => "/", }; write!(writer, " {} ", op)?; render_factor(writer, context, factor)?; } Ok(()) } } } pub fn render_factor<'a, 'b, W: fmt::Write>(writer: &mut W, context: &'b Context, fctr: &'a Factor) -> RenderResult<()> { match *fctr { Factor::Literal(ref lit) => { render_literal(writer, lit)?; }, Factor::Variable(ref id) => { write!(writer, "{}", id)?; }, Factor::Subexpression(ref expr) => { write!(writer, "(")?; render_expr(writer, context, expr)?; write!(writer, ")")?; }, Factor::Attribute(ref attr) => { render_factor(writer, context, &*attr.on)?; write!(writer, ".{}", attr.id)?; }, Factor::Invocation(ref inv) => { render_factor(writer, context, &*inv.on)?; write!(writer, "(")?; for (i, expr) in inv.args.iter().enumerate() { if i != 0 { write!(writer, ", ")?; } render_expr(writer, context, expr)?; } write!(writer, ")")?; }, }; Ok(()) } pub fn render_literal<'a, 'b, W: fmt::Write>(writer: &mut W, l: &'a Literal) -> RenderResult<()> { match *l { Literal::Str(ref string) => write!(writer, "{:?}", string)?, Literal::Char(ref chr) => write!(writer, "{:?}", chr)?, Literal::Int(ref int) => write!(writer, "{}", int)?, Literal::Real(ref real) => write!(writer, "{}", real)?, } Ok(()) } #[cfg(test)] mod tests { #![cfg_attr(feature = "clippy", allow(used_underscore_binding))] use std::fmt::Debug; use nom::IResult; use container::Template; use incrust::{Incrust, Args, ex}; use parser::expressions::expression as parse_expr; fn unwrap_iresult<B: Debug, T>(result: IResult<B, T>) -> T { match result { IResult::Done(_, v) => v, IResult::Error(e) => panic!("{:?}", e), IResult::Incomplete(i) => panic!("{:?}", i), } } #[test] fn eval_expr() { use super::render_expr; let args: Args = hashmap!{ "the_one".into() => ex("World"), "one".into() => ex(1_i64), "two".into() => ex(2_i64), }; let incrust = Incrust::default(); let template = Template::default(); let context = incrust.create_global_context(&template, &args).unwrap(); let context = context.top_scope(); let parse = |s| unwrap_iresult(parse_expr(s)); let test = |s, b| { let mut buf = String::new(); render_expr(&mut buf, &context, &parse(b)).unwrap(); assert_eq!(s, buf) }; test("1", b"1"); test("1 + 1", b"1+1"); test("1 + 1", b"1 + 1"); test("1 - 1", b"1 \n -\t1"); test("(1 / 1)", b"(1 / 1)"); test("1 * 1", b"1 * 1"); test("1 + 1 * 1", b"1 + 1 * 1"); test("(1 + 1) * 1", b"(1 + 1) * 1"); test("(1 + (1 / 1)) * 1", b"(1+(1/1))*1"); test("True and False", b"True and False"); test("0 or 1 and 2", b"0 or 1 and 2"); test("1 == 1", b"1 == 1"); test("1 != 1", b"1 != 1"); test("1 <= 1", b"1 <= 1"); test("1 >= 1", b"1 >= 1"); test("1 < 1", b"1 < 1"); test("1 > 1", b"1 > 1"); } }