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Update precedence rules to match design. (#3081)

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- Only allow assignment at the top level in an expression statement.
- Allow both negation and complement as subexpressions of both bitwise
  and numeric operators.
- Remove parsing support for postincrement and postdecrement.
- Add parsing support for `as` operator.
- Use the same ambient precedence for types and non-type expressions.

---------

Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
This commit is contained in:
Richard Smith
2023-08-10 18:39:37 +00:00
committed by GitHub
co-authored by Chandler Carruth
parent 3cca175a57
commit fc5a9541ce
18 changed files with 634 additions and 99 deletions
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toolchain/parser/testdata/if_expression/in_type.carbon
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+43
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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// AUTOUPDATE
var n: i32;
fn F() -> if true then i32 else i32* {
return if true then n else &n;
}
// CHECK:STDOUT: [
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'Name', text: 'n'},
// CHECK:STDOUT: {kind: 'Literal', text: 'i32'},
// CHECK:STDOUT: {kind: 'PatternBinding', text: ':', subtree_size: 3},
// CHECK:STDOUT: {kind: 'VariableDeclaration', text: ';', subtree_size: 5},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'Name', text: 'F'},
// CHECK:STDOUT: {kind: 'ParameterListStart', text: '('},
// CHECK:STDOUT: {kind: 'ParameterList', text: ')', subtree_size: 2},
// CHECK:STDOUT: {kind: 'Literal', text: 'true'},
// CHECK:STDOUT: {kind: 'IfExpressionIf', text: 'if', subtree_size: 2},
// CHECK:STDOUT: {kind: 'Literal', text: 'i32'},
// CHECK:STDOUT: {kind: 'IfExpressionThen', text: 'then', subtree_size: 2},
// CHECK:STDOUT: {kind: 'Literal', text: 'i32'},
// CHECK:STDOUT: {kind: 'PostfixOperator', text: '*', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IfExpressionElse', text: 'else', subtree_size: 7},
// CHECK:STDOUT: {kind: 'ReturnType', text: '->', subtree_size: 8},
// CHECK:STDOUT: {kind: 'FunctionDefinitionStart', text: '{', subtree_size: 13},
// CHECK:STDOUT: {kind: 'ReturnStatementStart', text: 'return'},
// CHECK:STDOUT: {kind: 'Literal', text: 'true'},
// CHECK:STDOUT: {kind: 'IfExpressionIf', text: 'if', subtree_size: 2},
// CHECK:STDOUT: {kind: 'NameExpression', text: 'n'},
// CHECK:STDOUT: {kind: 'IfExpressionThen', text: 'then', subtree_size: 2},
// CHECK:STDOUT: {kind: 'NameExpression', text: 'n'},
// CHECK:STDOUT: {kind: 'PrefixOperator', text: '&', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IfExpressionElse', text: 'else', subtree_size: 7},
// CHECK:STDOUT: {kind: 'ReturnStatement', text: ';', subtree_size: 9},
// CHECK:STDOUT: {kind: 'FunctionDefinition', text: '}', subtree_size: 23},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]