move parse_lit to expr.rs

3 files changed, 170 insertions, 177 deletions

diff --git a/src/libsyntax/parse/literal.rs b/src/libsyntax/parse/literal.rs
index 56a79bfe5d5..fbd409b0de4 100644
--- a/src/libsyntax/parse/literal.rs
+++ b/src/libsyntax/parse/literal.rs
@@ -1,14 +1,10 @@
 //! Code related to parsing literals.
 
 use crate::ast::{self, Lit, LitKind};
-use crate::parse::parser::Parser;
-use crate::parse::PResult;
-use crate::parse::token::{self, Token, TokenKind};
-use crate::print::pprust;
+use crate::parse::token::{self, Token};
 use crate::symbol::{kw, sym, Symbol};
 use crate::tokenstream::{TokenStream, TokenTree};
 
-use errors::{Applicability, Handler};
 use log::debug;
 use rustc_data_structures::sync::Lrc;
 use syntax_pos::Span;
@@ -28,72 +24,6 @@ crate enum LitError {
     IntTooLarge,
 }
 
-impl LitError {
-    fn report(&self, diag: &Handler, lit: token::Lit, span: Span) {
-        let token::Lit { kind, suffix, .. } = lit;
-        match *self {
-            // `NotLiteral` is not an error by itself, so we don't report
-            // it and give the parser opportunity to try something else.
-            LitError::NotLiteral => {}
-            // `LexerError` *is* an error, but it was already reported
-            // by lexer, so here we don't report it the second time.
-            LitError::LexerError => {}
-            LitError::InvalidSuffix => {
-                expect_no_suffix(
-                    diag, span, &format!("{} {} literal", kind.article(), kind.descr()), suffix
-                );
-            }
-            LitError::InvalidIntSuffix => {
-                let suf = suffix.expect("suffix error with no suffix").as_str();
-                if looks_like_width_suffix(&['i', 'u'], &suf) {
-                    // If it looks like a width, try to be helpful.
-                    let msg = format!("invalid width `{}` for integer literal", &suf[1..]);
-                    diag.struct_span_err(span, &msg)
-                        .help("valid widths are 8, 16, 32, 64 and 128")
-                        .emit();
-                } else {
-                    let msg = format!("invalid suffix `{}` for integer literal", suf);
-                    diag.struct_span_err(span, &msg)
-                        .span_label(span, format!("invalid suffix `{}`", suf))
-                        .help("the suffix must be one of the integral types (`u32`, `isize`, etc)")
-                        .emit();
-                }
-            }
-            LitError::InvalidFloatSuffix => {
-                let suf = suffix.expect("suffix error with no suffix").as_str();
-                if looks_like_width_suffix(&['f'], &suf) {
-                    // If it looks like a width, try to be helpful.
-                    let msg = format!("invalid width `{}` for float literal", &suf[1..]);
-                    diag.struct_span_err(span, &msg)
-                        .help("valid widths are 32 and 64")
-                        .emit();
-                } else {
-                    let msg = format!("invalid suffix `{}` for float literal", suf);
-                    diag.struct_span_err(span, &msg)
-                        .span_label(span, format!("invalid suffix `{}`", suf))
-                        .help("valid suffixes are `f32` and `f64`")
-                        .emit();
-                }
-            }
-            LitError::NonDecimalFloat(base) => {
-                let descr = match base {
-                    16 => "hexadecimal",
-                    8 => "octal",
-                    2 => "binary",
-                    _ => unreachable!(),
-                };
-                diag.struct_span_err(span, &format!("{} float literal is not supported", descr))
-                    .span_label(span, "not supported")
-                    .emit();
-            }
-            LitError::IntTooLarge => {
-                diag.struct_span_err(span, "integer literal is too large")
-                    .emit();
-            }
-        }
-    }
-}
-
 impl LitKind {
     /// Converts literal token into a semantic literal.
     fn from_lit_token(lit: token::Lit) -> Result<LitKind, LitError> {
@@ -254,7 +184,7 @@ impl LitKind {
 
 impl Lit {
     /// Converts literal token into an AST literal.
-    fn from_lit_token(token: token::Lit, span: Span) -> Result<Lit, LitError> {
+    crate fn from_lit_token(token: token::Lit, span: Span) -> Result<Lit, LitError> {
         Ok(Lit { token, kind: LitKind::from_lit_token(token)?, span })
     }
 
@@ -296,99 +226,6 @@ impl Lit {
     }
 }
 
-impl<'a> Parser<'a> {
-    /// Matches `lit = true | false | token_lit`.
-    crate fn parse_lit(&mut self) -> PResult<'a, Lit> {
-        let mut recovered = None;
-        if self.token == token::Dot {
-            // Attempt to recover `.4` as `0.4`.
-            recovered = self.look_ahead(1, |next_token| {
-                if let token::Literal(token::Lit { kind: token::Integer, symbol, suffix })
-                        = next_token.kind {
-                    if self.token.span.hi() == next_token.span.lo() {
-                        let s = String::from("0.") + &symbol.as_str();
-                        let kind = TokenKind::lit(token::Float, Symbol::intern(&s), suffix);
-                        return Some(Token::new(kind, self.token.span.to(next_token.span)));
-                    }
-                }
-                None
-            });
-            if let Some(token) = &recovered {
-                self.bump();
-                self.diagnostic()
-                    .struct_span_err(token.span, "float literals must have an integer part")
-                    .span_suggestion(
-                        token.span,
-                        "must have an integer part",
-                        pprust::token_to_string(token),
-                        Applicability::MachineApplicable,
-                    )
-                    .emit();
-            }
-        }
-
-        let token = recovered.as_ref().unwrap_or(&self.token);
-        match Lit::from_token(token) {
-            Ok(lit) => {
-                self.bump();
-                Ok(lit)
-            }
-            Err(LitError::NotLiteral) => {
-                let msg = format!("unexpected token: {}", self.this_token_descr());
-                Err(self.span_fatal(token.span, &msg))
-            }
-            Err(err) => {
-                let (lit, span) = (token.expect_lit(), token.span);
-                self.bump();
-                err.report(&self.sess.span_diagnostic, lit, span);
-                // Pack possible quotes and prefixes from the original literal into
-                // the error literal's symbol so they can be pretty-printed faithfully.
-                let suffixless_lit = token::Lit::new(lit.kind, lit.symbol, None);
-                let symbol = Symbol::intern(&suffixless_lit.to_string());
-                let lit = token::Lit::new(token::Err, symbol, lit.suffix);
-                Lit::from_lit_token(lit, span).map_err(|_| unreachable!())
-            }
-        }
-    }
-}
-
-crate fn expect_no_suffix(diag: &Handler, sp: Span, kind: &str, suffix: Option<Symbol>) {
-    if let Some(suf) = suffix {
-        let mut err = if kind == "a tuple index" &&
-                         [sym::i32, sym::u32, sym::isize, sym::usize].contains(&suf) {
-            // #59553: warn instead of reject out of hand to allow the fix to percolate
-            // through the ecosystem when people fix their macros
-            let mut err = diag.struct_span_warn(
-                sp,
-                &format!("suffixes on {} are invalid", kind),
-            );
-            err.note(&format!(
-                "`{}` is *temporarily* accepted on tuple index fields as it was \
-                    incorrectly accepted on stable for a few releases",
-                suf,
-            ));
-            err.help(
-                "on proc macros, you'll want to use `syn::Index::from` or \
-                    `proc_macro::Literal::*_unsuffixed` for code that will desugar \
-                    to tuple field access",
-            );
-            err.note(
-                "for more context, see https://github.com/rust-lang/rust/issues/60210",
-            );
-            err
-        } else {
-            diag.struct_span_err(sp, &format!("suffixes on {} are invalid", kind))
-        };
-        err.span_label(sp, format!("invalid suffix `{}`", suf));
-        err.emit();
-    }
-}
-
-// Checks if `s` looks like i32 or u1234 etc.
-fn looks_like_width_suffix(first_chars: &[char], s: &str) -> bool {
-    s.len() > 1 && s.starts_with(first_chars) && s[1..].chars().all(|c| c.is_ascii_digit())
-}
-
 fn strip_underscores(symbol: Symbol) -> Symbol {
     // Do not allocate a new string unless necessary.
     let s = symbol.as_str();
diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index 2b973479833..a3ac6d0c81f 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -15,10 +15,10 @@ use crate::ast::{
     self, DUMMY_NODE_ID, AttrStyle, Attribute, CrateSugar, Ident,
     IsAsync, MacDelimiter, Mutability, StrStyle, Visibility, VisibilityKind, Unsafety,
 };
-use crate::parse::{ParseSess, PResult, Directory, DirectoryOwnership, SeqSep, literal, token};
+use crate::parse::{ParseSess, PResult, Directory, DirectoryOwnership, SeqSep};
 use crate::parse::lexer::UnmatchedBrace;
 use crate::parse::lexer::comments::{doc_comment_style, strip_doc_comment_decoration};
-use crate::parse::token::{Token, TokenKind, DelimToken};
+use crate::parse::token::{self, Token, TokenKind, DelimToken};
 use crate::print::pprust;
 use crate::ptr::P;
 use crate::source_map::respan;
@@ -637,10 +637,6 @@ impl<'a> Parser<'a> {
         }
     }
 
-    fn expect_no_suffix(&self, sp: Span, kind: &str, suffix: Option<ast::Name>) {
-        literal::expect_no_suffix(&self.sess.span_diagnostic, sp, kind, suffix)
-    }
-
     /// Attempts to consume a `<`. If `<<` is seen, replaces it with a single
     /// `<` and continue. If `<-` is seen, replaces it with a single `<`
     /// and continue. If a `<` is not seen, returns false.
diff --git a/src/libsyntax/parse/parser/expr.rs b/src/libsyntax/parse/parser/expr.rs
index 660bf9b7d65..dd0fd834fb0 100644
--- a/src/libsyntax/parse/parser/expr.rs
+++ b/src/libsyntax/parse/parser/expr.rs
@@ -1,17 +1,17 @@
-use super::{
-    Parser, PResult, Restrictions, PrevTokenKind, TokenType, PathStyle, BlockMode, SemiColonMode,
-    SeqSep, TokenExpectType,
-};
+use super::{Parser, PResult, Restrictions, PrevTokenKind, TokenType, PathStyle, BlockMode};
+use super::{SemiColonMode, SeqSep, TokenExpectType};
 use super::pat::{GateOr, PARAM_EXPECTED};
 
+use crate::parse::literal::LitError;
+
 use crate::ast::{
     self, DUMMY_NODE_ID, Attribute, AttrStyle, Ident, CaptureBy, BlockCheckMode,
     Expr, ExprKind, RangeLimits, Label, Movability, IsAsync, Arm, Ty, TyKind,
-    FunctionRetTy, Param, FnDecl, BinOpKind, BinOp, UnOp, Mac, AnonConst, Field,
+    FunctionRetTy, Param, FnDecl, BinOpKind, BinOp, UnOp, Mac, AnonConst, Field, Lit,
 };
 use crate::maybe_recover_from_interpolated_ty_qpath;
 use crate::parse::classify;
-use crate::parse::token::{self, Token};
+use crate::parse::token::{self, Token, TokenKind};
 use crate::parse::diagnostics::Error;
 use crate::print::pprust;
 use crate::ptr::P;
@@ -20,6 +20,7 @@ use crate::symbol::{kw, sym};
 use crate::util::parser::{AssocOp, Fixity, prec_let_scrutinee_needs_par};
 
 use errors::Applicability;
+use syntax_pos::Symbol;
 use std::mem;
 use rustc_data_structures::thin_vec::ThinVec;
 
@@ -1072,6 +1073,165 @@ impl<'a> Parser<'a> {
         self.maybe_recover_from_bad_qpath(expr, true)
     }
 
+    /// Matches `lit = true | false | token_lit`.
+    crate fn parse_lit(&mut self) -> PResult<'a, Lit> {
+        let mut recovered = None;
+        if self.token == token::Dot {
+            // Attempt to recover `.4` as `0.4`.
+            recovered = self.look_ahead(1, |next_token| {
+                if let token::Literal(token::Lit { kind: token::Integer, symbol, suffix })
+                        = next_token.kind {
+                    if self.token.span.hi() == next_token.span.lo() {
+                        let s = String::from("0.") + &symbol.as_str();
+                        let kind = TokenKind::lit(token::Float, Symbol::intern(&s), suffix);
+                        return Some(Token::new(kind, self.token.span.to(next_token.span)));
+                    }
+                }
+                None
+            });
+            if let Some(token) = &recovered {
+                self.bump();
+                self.struct_span_err(token.span, "float literals must have an integer part")
+                    .span_suggestion(
+                        token.span,
+                        "must have an integer part",
+                        pprust::token_to_string(token),
+                        Applicability::MachineApplicable,
+                    )
+                    .emit();
+            }
+        }
+
+        let token = recovered.as_ref().unwrap_or(&self.token);
+        match Lit::from_token(token) {
+            Ok(lit) => {
+                self.bump();
+                Ok(lit)
+            }
+            Err(LitError::NotLiteral) => {
+                let msg = format!("unexpected token: {}", self.this_token_descr());
+                Err(self.span_fatal(token.span, &msg))
+            }
+            Err(err) => {
+                let (lit, span) = (token.expect_lit(), token.span);
+                self.bump();
+                self.error_literal_from_token(err, lit, span);
+                // Pack possible quotes and prefixes from the original literal into
+                // the error literal's symbol so they can be pretty-printed faithfully.
+                let suffixless_lit = token::Lit::new(lit.kind, lit.symbol, None);
+                let symbol = Symbol::intern(&suffixless_lit.to_string());
+                let lit = token::Lit::new(token::Err, symbol, lit.suffix);
+                Lit::from_lit_token(lit, span).map_err(|_| unreachable!())
+            }
+        }
+    }
+
+    fn error_literal_from_token(&self, err: LitError, lit: token::Lit, span: Span) {
+        // Checks if `s` looks like i32 or u1234 etc.
+        fn looks_like_width_suffix(first_chars: &[char], s: &str) -> bool {
+            s.len() > 1
+            && s.starts_with(first_chars)
+            && s[1..].chars().all(|c| c.is_ascii_digit())
+        }
+
+        let token::Lit { kind, suffix, .. } = lit;
+        match err {
+            // `NotLiteral` is not an error by itself, so we don't report
+            // it and give the parser opportunity to try something else.
+            LitError::NotLiteral => {}
+            // `LexerError` *is* an error, but it was already reported
+            // by lexer, so here we don't report it the second time.
+            LitError::LexerError => {}
+            LitError::InvalidSuffix => {
+                self.expect_no_suffix(
+                    span,
+                    &format!("{} {} literal", kind.article(), kind.descr()),
+                    suffix,
+                );
+            }
+            LitError::InvalidIntSuffix => {
+                let suf = suffix.expect("suffix error with no suffix").as_str();
+                if looks_like_width_suffix(&['i', 'u'], &suf) {
+                    // If it looks like a width, try to be helpful.
+                    let msg = format!("invalid width `{}` for integer literal", &suf[1..]);
+                    self.struct_span_err(span, &msg)
+                        .help("valid widths are 8, 16, 32, 64 and 128")
+                        .emit();
+                } else {
+                    let msg = format!("invalid suffix `{}` for integer literal", suf);
+                    self.struct_span_err(span, &msg)
+                        .span_label(span, format!("invalid suffix `{}`", suf))
+                        .help("the suffix must be one of the integral types (`u32`, `isize`, etc)")
+                        .emit();
+                }
+            }
+            LitError::InvalidFloatSuffix => {
+                let suf = suffix.expect("suffix error with no suffix").as_str();
+                if looks_like_width_suffix(&['f'], &suf) {
+                    // If it looks like a width, try to be helpful.
+                    let msg = format!("invalid width `{}` for float literal", &suf[1..]);
+                    self.struct_span_err(span, &msg)
+                        .help("valid widths are 32 and 64")
+                        .emit();
+                } else {
+                    let msg = format!("invalid suffix `{}` for float literal", suf);
+                    self.struct_span_err(span, &msg)
+                        .span_label(span, format!("invalid suffix `{}`", suf))
+                        .help("valid suffixes are `f32` and `f64`")
+                        .emit();
+                }
+            }
+            LitError::NonDecimalFloat(base) => {
+                let descr = match base {
+                    16 => "hexadecimal",
+                    8 => "octal",
+                    2 => "binary",
+                    _ => unreachable!(),
+                };
+                self.struct_span_err(span, &format!("{} float literal is not supported", descr))
+                    .span_label(span, "not supported")
+                    .emit();
+            }
+            LitError::IntTooLarge => {
+                self.struct_span_err(span, "integer literal is too large")
+                    .emit();
+            }
+        }
+    }
+
+    pub(super) fn expect_no_suffix(&self, sp: Span, kind: &str, suffix: Option<Symbol>) {
+        if let Some(suf) = suffix {
+            let mut err = if kind == "a tuple index"
+                && [sym::i32, sym::u32, sym::isize, sym::usize].contains(&suf)
+            {
+                // #59553: warn instead of reject out of hand to allow the fix to percolate
+                // through the ecosystem when people fix their macros
+                let mut err = self.sess.span_diagnostic.struct_span_warn(
+                    sp,
+                    &format!("suffixes on {} are invalid", kind),
+                );
+                err.note(&format!(
+                    "`{}` is *temporarily* accepted on tuple index fields as it was \
+                        incorrectly accepted on stable for a few releases",
+                    suf,
+                ));
+                err.help(
+                    "on proc macros, you'll want to use `syn::Index::from` or \
+                        `proc_macro::Literal::*_unsuffixed` for code that will desugar \
+                        to tuple field access",
+                );
+                err.note(
+                    "for more context, see https://github.com/rust-lang/rust/issues/60210",
+                );
+                err
+            } else {
+                self.struct_span_err(sp, &format!("suffixes on {} are invalid", kind))
+            };
+            err.span_label(sp, format!("invalid suffix `{}`", suf));
+            err.emit();
+        }
+    }
+
     /// Matches `'-' lit | lit` (cf. `ast_validation::AstValidator::check_expr_within_pat`).
     crate fn parse_literal_maybe_minus(&mut self) -> PResult<'a, P<Expr>> {
         maybe_whole_expr!(self);