Move expr-related pretty printing functions to module
This commit is contained in:
David Tolnay
parent
9ad5d82f82
commit
b1605643e3
2 changed files with 574 additions and 564 deletions
571
compiler/rustc_ast_pretty/src/pprust/state/expr.rs
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571
compiler/rustc_ast_pretty/src/pprust/state/expr.rs
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@ -0,0 +1,571 @@
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use crate::pp::Breaks::{Consistent, Inconsistent};
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use crate::pprust::state::{AnnNode, PrintState, State, INDENT_UNIT};
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use rustc_ast::ptr::P;
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use rustc_ast::util::parser::{self, AssocOp, Fixity};
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use rustc_ast::{self as ast, BlockCheckMode};
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impl<'a> State<'a> {
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fn print_else(&mut self, els: Option<&ast::Expr>) {
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if let Some(_else) = els {
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match _else.kind {
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// Another `else if` block.
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ast::ExprKind::If(ref i, ref then, ref e) => {
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self.cbox(INDENT_UNIT - 1);
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self.ibox(0);
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self.word(" else if ");
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self.print_expr_as_cond(i);
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self.space();
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self.print_block(then);
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self.print_else(e.as_deref())
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}
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// Final `else` block.
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ast::ExprKind::Block(ref b, _) => {
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self.cbox(INDENT_UNIT - 1);
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self.ibox(0);
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self.word(" else ");
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self.print_block(b)
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}
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// Constraints would be great here!
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_ => {
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panic!("print_if saw if with weird alternative");
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}
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}
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}
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}
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fn print_if(&mut self, test: &ast::Expr, blk: &ast::Block, elseopt: Option<&ast::Expr>) {
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self.head("if");
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self.print_expr_as_cond(test);
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self.space();
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self.print_block(blk);
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self.print_else(elseopt)
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}
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fn print_call_post(&mut self, args: &[P<ast::Expr>]) {
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self.popen();
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self.commasep_exprs(Inconsistent, args);
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self.pclose()
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}
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fn print_expr_maybe_paren(&mut self, expr: &ast::Expr, prec: i8) {
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self.print_expr_cond_paren(expr, expr.precedence().order() < prec)
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}
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/// Prints an expr using syntax that's acceptable in a condition position, such as the `cond` in
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/// `if cond { ... }`.
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fn print_expr_as_cond(&mut self, expr: &ast::Expr) {
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self.print_expr_cond_paren(expr, Self::cond_needs_par(expr))
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}
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// Does `expr` need parentheses when printed in a condition position?
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//
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// These cases need parens due to the parse error observed in #26461: `if return {}`
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// parses as the erroneous construct `if (return {})`, not `if (return) {}`.
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pub(super) fn cond_needs_par(expr: &ast::Expr) -> bool {
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match expr.kind {
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ast::ExprKind::Break(..) | ast::ExprKind::Closure(..) | ast::ExprKind::Ret(..) => true,
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_ => parser::contains_exterior_struct_lit(expr),
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}
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}
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/// Prints `expr` or `(expr)` when `needs_par` holds.
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pub(super) fn print_expr_cond_paren(&mut self, expr: &ast::Expr, needs_par: bool) {
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if needs_par {
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self.popen();
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}
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self.print_expr(expr);
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if needs_par {
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self.pclose();
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}
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}
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fn print_expr_vec(&mut self, exprs: &[P<ast::Expr>]) {
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self.ibox(INDENT_UNIT);
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self.word("[");
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self.commasep_exprs(Inconsistent, exprs);
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self.word("]");
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self.end();
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}
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pub(super) fn print_expr_anon_const(&mut self, expr: &ast::AnonConst) {
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self.ibox(INDENT_UNIT);
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self.word("const");
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self.print_expr(&expr.value);
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self.end();
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}
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fn print_expr_repeat(&mut self, element: &ast::Expr, count: &ast::AnonConst) {
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self.ibox(INDENT_UNIT);
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self.word("[");
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self.print_expr(element);
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self.word_space(";");
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self.print_expr(&count.value);
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self.word("]");
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self.end();
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}
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fn print_expr_struct(
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&mut self,
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qself: &Option<ast::QSelf>,
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path: &ast::Path,
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fields: &[ast::ExprField],
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rest: &ast::StructRest,
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) {
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if let Some(qself) = qself {
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self.print_qpath(path, qself, true);
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} else {
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self.print_path(path, true, 0);
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}
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self.word("{");
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self.commasep_cmnt(
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Consistent,
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fields,
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|s, field| {
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s.print_outer_attributes(&field.attrs);
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s.ibox(INDENT_UNIT);
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if !field.is_shorthand {
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s.print_ident(field.ident);
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s.word_space(":");
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}
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s.print_expr(&field.expr);
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s.end();
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},
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|f| f.span,
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);
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match rest {
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ast::StructRest::Base(_) | ast::StructRest::Rest(_) => {
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self.ibox(INDENT_UNIT);
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if !fields.is_empty() {
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self.word(",");
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self.space();
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}
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self.word("..");
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if let ast::StructRest::Base(ref expr) = *rest {
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self.print_expr(expr);
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}
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self.end();
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}
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ast::StructRest::None if !fields.is_empty() => self.word(","),
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_ => {}
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}
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self.word("}");
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}
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fn print_expr_tup(&mut self, exprs: &[P<ast::Expr>]) {
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self.popen();
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self.commasep_exprs(Inconsistent, exprs);
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if exprs.len() == 1 {
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self.word(",");
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}
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self.pclose()
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}
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fn print_expr_call(&mut self, func: &ast::Expr, args: &[P<ast::Expr>]) {
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let prec = match func.kind {
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ast::ExprKind::Field(..) => parser::PREC_FORCE_PAREN,
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_ => parser::PREC_POSTFIX,
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};
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self.print_expr_maybe_paren(func, prec);
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self.print_call_post(args)
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}
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fn print_expr_method_call(&mut self, segment: &ast::PathSegment, args: &[P<ast::Expr>]) {
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let base_args = &args[1..];
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self.print_expr_maybe_paren(&args[0], parser::PREC_POSTFIX);
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self.word(".");
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self.print_ident(segment.ident);
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if let Some(ref args) = segment.args {
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self.print_generic_args(args, true);
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}
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self.print_call_post(base_args)
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}
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fn print_expr_binary(&mut self, op: ast::BinOp, lhs: &ast::Expr, rhs: &ast::Expr) {
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let assoc_op = AssocOp::from_ast_binop(op.node);
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let prec = assoc_op.precedence() as i8;
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let fixity = assoc_op.fixity();
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let (left_prec, right_prec) = match fixity {
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Fixity::Left => (prec, prec + 1),
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Fixity::Right => (prec + 1, prec),
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Fixity::None => (prec + 1, prec + 1),
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};
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let left_prec = match (&lhs.kind, op.node) {
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// These cases need parens: `x as i32 < y` has the parser thinking that `i32 < y` is
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// the beginning of a path type. It starts trying to parse `x as (i32 < y ...` instead
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// of `(x as i32) < ...`. We need to convince it _not_ to do that.
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(&ast::ExprKind::Cast { .. }, ast::BinOpKind::Lt | ast::BinOpKind::Shl) => {
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parser::PREC_FORCE_PAREN
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}
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// We are given `(let _ = a) OP b`.
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//
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// - When `OP <= LAnd` we should print `let _ = a OP b` to avoid redundant parens
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// as the parser will interpret this as `(let _ = a) OP b`.
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//
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// - Otherwise, e.g. when we have `(let a = b) < c` in AST,
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// parens are required since the parser would interpret `let a = b < c` as
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// `let a = (b < c)`. To achieve this, we force parens.
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(&ast::ExprKind::Let { .. }, _) if !parser::needs_par_as_let_scrutinee(prec) => {
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parser::PREC_FORCE_PAREN
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}
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_ => left_prec,
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};
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self.print_expr_maybe_paren(lhs, left_prec);
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self.space();
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self.word_space(op.node.to_string());
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self.print_expr_maybe_paren(rhs, right_prec)
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}
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fn print_expr_unary(&mut self, op: ast::UnOp, expr: &ast::Expr) {
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self.word(ast::UnOp::to_string(op));
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self.print_expr_maybe_paren(expr, parser::PREC_PREFIX)
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}
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fn print_expr_addr_of(
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&mut self,
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kind: ast::BorrowKind,
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mutability: ast::Mutability,
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expr: &ast::Expr,
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) {
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self.word("&");
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match kind {
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ast::BorrowKind::Ref => self.print_mutability(mutability, false),
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ast::BorrowKind::Raw => {
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self.word_nbsp("raw");
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self.print_mutability(mutability, true);
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}
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}
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self.print_expr_maybe_paren(expr, parser::PREC_PREFIX)
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}
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pub fn print_expr(&mut self, expr: &ast::Expr) {
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self.print_expr_outer_attr_style(expr, true)
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}
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pub(super) fn print_expr_outer_attr_style(&mut self, expr: &ast::Expr, is_inline: bool) {
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self.maybe_print_comment(expr.span.lo());
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let attrs = &expr.attrs;
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if is_inline {
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self.print_outer_attributes_inline(attrs);
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} else {
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self.print_outer_attributes(attrs);
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}
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self.ibox(INDENT_UNIT);
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self.ann.pre(self, AnnNode::Expr(expr));
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match expr.kind {
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ast::ExprKind::Box(ref expr) => {
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self.word_space("box");
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self.print_expr_maybe_paren(expr, parser::PREC_PREFIX);
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}
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ast::ExprKind::Array(ref exprs) => {
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self.print_expr_vec(exprs);
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}
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ast::ExprKind::ConstBlock(ref anon_const) => {
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self.print_expr_anon_const(anon_const);
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}
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ast::ExprKind::Repeat(ref element, ref count) => {
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self.print_expr_repeat(element, count);
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}
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ast::ExprKind::Struct(ref se) => {
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self.print_expr_struct(&se.qself, &se.path, &se.fields, &se.rest);
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}
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ast::ExprKind::Tup(ref exprs) => {
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self.print_expr_tup(exprs);
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}
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ast::ExprKind::Call(ref func, ref args) => {
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self.print_expr_call(func, &args);
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}
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ast::ExprKind::MethodCall(ref segment, ref args, _) => {
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self.print_expr_method_call(segment, &args);
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}
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ast::ExprKind::Binary(op, ref lhs, ref rhs) => {
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self.print_expr_binary(op, lhs, rhs);
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}
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ast::ExprKind::Unary(op, ref expr) => {
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self.print_expr_unary(op, expr);
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}
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ast::ExprKind::AddrOf(k, m, ref expr) => {
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self.print_expr_addr_of(k, m, expr);
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}
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ast::ExprKind::Lit(ref lit) => {
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self.print_literal(lit);
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}
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ast::ExprKind::Cast(ref expr, ref ty) => {
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let prec = AssocOp::As.precedence() as i8;
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self.print_expr_maybe_paren(expr, prec);
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self.space();
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self.word_space("as");
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self.print_type(ty);
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}
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ast::ExprKind::Type(ref expr, ref ty) => {
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let prec = AssocOp::Colon.precedence() as i8;
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self.print_expr_maybe_paren(expr, prec);
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self.word_space(":");
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self.print_type(ty);
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}
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ast::ExprKind::Let(ref pat, ref scrutinee, _) => {
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self.print_let(pat, scrutinee);
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}
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ast::ExprKind::If(ref test, ref blk, ref elseopt) => {
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self.print_if(test, blk, elseopt.as_deref())
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}
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ast::ExprKind::While(ref test, ref blk, opt_label) => {
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if let Some(label) = opt_label {
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self.print_ident(label.ident);
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self.word_space(":");
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}
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self.head("while");
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self.print_expr_as_cond(test);
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self.space();
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self.print_block_with_attrs(blk, attrs);
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}
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ast::ExprKind::ForLoop(ref pat, ref iter, ref blk, opt_label) => {
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if let Some(label) = opt_label {
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self.print_ident(label.ident);
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self.word_space(":");
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}
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self.head("for");
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self.print_pat(pat);
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self.space();
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self.word_space("in");
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self.print_expr_as_cond(iter);
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self.space();
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self.print_block_with_attrs(blk, attrs);
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}
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ast::ExprKind::Loop(ref blk, opt_label) => {
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if let Some(label) = opt_label {
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self.print_ident(label.ident);
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self.word_space(":");
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}
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self.head("loop");
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self.print_block_with_attrs(blk, attrs);
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}
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ast::ExprKind::Match(ref expr, ref arms) => {
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self.cbox(INDENT_UNIT);
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self.ibox(INDENT_UNIT);
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self.word_nbsp("match");
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self.print_expr_as_cond(expr);
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self.space();
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self.bopen();
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self.print_inner_attributes_no_trailing_hardbreak(attrs);
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for arm in arms {
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self.print_arm(arm);
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}
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let empty = attrs.is_empty() && arms.is_empty();
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self.bclose(expr.span, empty);
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}
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ast::ExprKind::Closure(
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capture_clause,
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asyncness,
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movability,
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ref decl,
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ref body,
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_,
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) => {
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self.print_movability(movability);
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self.print_asyncness(asyncness);
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self.print_capture_clause(capture_clause);
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self.print_fn_params_and_ret(decl, true);
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self.space();
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self.print_expr(body);
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self.end(); // need to close a box
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// a box will be closed by print_expr, but we didn't want an overall
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// wrapper so we closed the corresponding opening. so create an
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// empty box to satisfy the close.
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self.ibox(0);
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}
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ast::ExprKind::Block(ref blk, opt_label) => {
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if let Some(label) = opt_label {
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self.print_ident(label.ident);
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self.word_space(":");
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}
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// containing cbox, will be closed by print-block at }
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self.cbox(INDENT_UNIT);
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// head-box, will be closed by print-block after {
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self.ibox(0);
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self.print_block_with_attrs(blk, attrs);
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}
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ast::ExprKind::Async(capture_clause, _, ref blk) => {
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self.word_nbsp("async");
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self.print_capture_clause(capture_clause);
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// cbox/ibox in analogy to the `ExprKind::Block` arm above
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self.cbox(INDENT_UNIT);
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self.ibox(0);
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self.print_block_with_attrs(blk, attrs);
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}
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ast::ExprKind::Await(ref expr) => {
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self.print_expr_maybe_paren(expr, parser::PREC_POSTFIX);
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self.word(".await");
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}
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ast::ExprKind::Assign(ref lhs, ref rhs, _) => {
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let prec = AssocOp::Assign.precedence() as i8;
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self.print_expr_maybe_paren(lhs, prec + 1);
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self.space();
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self.word_space("=");
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self.print_expr_maybe_paren(rhs, prec);
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}
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ast::ExprKind::AssignOp(op, ref lhs, ref rhs) => {
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let prec = AssocOp::Assign.precedence() as i8;
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self.print_expr_maybe_paren(lhs, prec + 1);
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self.space();
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self.word(op.node.to_string());
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self.word_space("=");
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self.print_expr_maybe_paren(rhs, prec);
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}
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ast::ExprKind::Field(ref expr, ident) => {
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self.print_expr_maybe_paren(expr, parser::PREC_POSTFIX);
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self.word(".");
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self.print_ident(ident);
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}
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ast::ExprKind::Index(ref expr, ref index) => {
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self.print_expr_maybe_paren(expr, parser::PREC_POSTFIX);
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self.word("[");
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self.print_expr(index);
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self.word("]");
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}
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ast::ExprKind::Range(ref start, ref end, limits) => {
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// Special case for `Range`. `AssocOp` claims that `Range` has higher precedence
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// than `Assign`, but `x .. x = x` gives a parse error instead of `x .. (x = x)`.
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// Here we use a fake precedence value so that any child with lower precedence than
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// a "normal" binop gets parenthesized. (`LOr` is the lowest-precedence binop.)
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let fake_prec = AssocOp::LOr.precedence() as i8;
|
||||
if let Some(ref e) = *start {
|
||||
self.print_expr_maybe_paren(e, fake_prec);
|
||||
}
|
||||
if limits == ast::RangeLimits::HalfOpen {
|
||||
self.word("..");
|
||||
} else {
|
||||
self.word("..=");
|
||||
}
|
||||
if let Some(ref e) = *end {
|
||||
self.print_expr_maybe_paren(e, fake_prec);
|
||||
}
|
||||
}
|
||||
ast::ExprKind::Underscore => self.word("_"),
|
||||
ast::ExprKind::Path(None, ref path) => self.print_path(path, true, 0),
|
||||
ast::ExprKind::Path(Some(ref qself), ref path) => self.print_qpath(path, qself, true),
|
||||
ast::ExprKind::Break(opt_label, ref opt_expr) => {
|
||||
self.word("break");
|
||||
if let Some(label) = opt_label {
|
||||
self.space();
|
||||
self.print_ident(label.ident);
|
||||
}
|
||||
if let Some(ref expr) = *opt_expr {
|
||||
self.space();
|
||||
self.print_expr_maybe_paren(expr, parser::PREC_JUMP);
|
||||
}
|
||||
}
|
||||
ast::ExprKind::Continue(opt_label) => {
|
||||
self.word("continue");
|
||||
if let Some(label) = opt_label {
|
||||
self.space();
|
||||
self.print_ident(label.ident);
|
||||
}
|
||||
}
|
||||
ast::ExprKind::Ret(ref result) => {
|
||||
self.word("return");
|
||||
if let Some(ref expr) = *result {
|
||||
self.word(" ");
|
||||
self.print_expr_maybe_paren(expr, parser::PREC_JUMP);
|
||||
}
|
||||
}
|
||||
ast::ExprKind::InlineAsm(ref a) => {
|
||||
self.word("asm!");
|
||||
self.print_inline_asm(a);
|
||||
}
|
||||
ast::ExprKind::MacCall(ref m) => self.print_mac(m),
|
||||
ast::ExprKind::Paren(ref e) => {
|
||||
self.popen();
|
||||
self.print_expr(e);
|
||||
self.pclose();
|
||||
}
|
||||
ast::ExprKind::Yield(ref e) => {
|
||||
self.word("yield");
|
||||
|
||||
if let Some(ref expr) = *e {
|
||||
self.space();
|
||||
self.print_expr_maybe_paren(expr, parser::PREC_JUMP);
|
||||
}
|
||||
}
|
||||
ast::ExprKind::Try(ref e) => {
|
||||
self.print_expr_maybe_paren(e, parser::PREC_POSTFIX);
|
||||
self.word("?")
|
||||
}
|
||||
ast::ExprKind::TryBlock(ref blk) => {
|
||||
self.head("try");
|
||||
self.print_block_with_attrs(blk, attrs)
|
||||
}
|
||||
ast::ExprKind::Err => {
|
||||
self.popen();
|
||||
self.word("/*ERROR*/");
|
||||
self.pclose()
|
||||
}
|
||||
}
|
||||
self.ann.post(self, AnnNode::Expr(expr));
|
||||
self.end();
|
||||
}
|
||||
|
||||
fn print_arm(&mut self, arm: &ast::Arm) {
|
||||
// Note, I have no idea why this check is necessary, but here it is.
|
||||
if arm.attrs.is_empty() {
|
||||
self.space();
|
||||
}
|
||||
self.cbox(INDENT_UNIT);
|
||||
self.ibox(0);
|
||||
self.maybe_print_comment(arm.pat.span.lo());
|
||||
self.print_outer_attributes(&arm.attrs);
|
||||
self.print_pat(&arm.pat);
|
||||
self.space();
|
||||
if let Some(ref e) = arm.guard {
|
||||
self.word_space("if");
|
||||
self.print_expr(e);
|
||||
self.space();
|
||||
}
|
||||
self.word_space("=>");
|
||||
|
||||
match arm.body.kind {
|
||||
ast::ExprKind::Block(ref blk, opt_label) => {
|
||||
if let Some(label) = opt_label {
|
||||
self.print_ident(label.ident);
|
||||
self.word_space(":");
|
||||
}
|
||||
|
||||
// The block will close the pattern's ibox.
|
||||
self.print_block_unclosed_indent(blk);
|
||||
|
||||
// If it is a user-provided unsafe block, print a comma after it.
|
||||
if let BlockCheckMode::Unsafe(ast::UserProvided) = blk.rules {
|
||||
self.word(",");
|
||||
}
|
||||
}
|
||||
_ => {
|
||||
self.end(); // Close the ibox for the pattern.
|
||||
self.print_expr(&arm.body);
|
||||
self.word(",");
|
||||
}
|
||||
}
|
||||
self.end(); // Close enclosing cbox.
|
||||
}
|
||||
|
||||
fn print_movability(&mut self, movability: ast::Movability) {
|
||||
match movability {
|
||||
ast::Movability::Static => self.word_space("static"),
|
||||
ast::Movability::Movable => {}
|
||||
}
|
||||
}
|
||||
|
||||
fn print_capture_clause(&mut self, capture_clause: ast::CaptureBy) {
|
||||
match capture_clause {
|
||||
ast::CaptureBy::Value => self.word_space("move"),
|
||||
ast::CaptureBy::Ref => {}
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue