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carbon-lang/toolchain/parse/testdata/basics/value_literals.carbon
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Richard Smith 41ed82e033 Add basic support for strings to core, check, and lower. (#5963) 
Add a `Core.String` class to the prelude representing a string view, and
rename the `String` keyword to `str` and make it evaluate to
`Core.String`.

`Core.String` is represented as a pair of a pointer to a character
(actually, to the first character of a string, but we don't have a way
of modeling that yet) and a size (which should be pointer-width, but is
currently always a `u64` as we don't have a `usize` equivalent yet).
`Core.String` values are generated directly by the toolchain for string
literal expressions.

This follows the direction established at the recent summit, but the
design implemented here has not been through the proposal process yet.
2025-08-20 00:18:50 +00:00

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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
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/parse/testdata/basics/value_literals.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/parse/testdata/basics/value_literals.carbon
// --- int_literals.carbon
// 8 and 9 trigger special behavior in APInt when mishandling signed versus
// unsigned, so we pay extra attention to those.
var ints: array(i32, 5) = (
8,
9,
0x8,
0b1000,
39999999999999999993,
);
// --- real_literals.carbon
var reals: array(f64, 7) = (
0.9,
8.0,
80.0,
1.0e7,
1.0e8,
1.0e-8,
39999999999999999993.0e39999999999999999993,
);
// --- bool_literal.carbon
var f: bool = false;
var t: bool = true;
// --- char_literal.carbon
var c: Core.Char = 'c';
// --- string_literal.carbon
var test_str: str = "Test";
// CHECK:STDOUT: - filename: int_literals.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'ints'},
// CHECK:STDOUT: {kind: 'ArrayExprKeyword', text: 'array'},
// CHECK:STDOUT: {kind: 'ArrayExprOpenParen', text: '('},
// CHECK:STDOUT: {kind: 'IntTypeLiteral', text: 'i32'},
// CHECK:STDOUT: {kind: 'ArrayExprComma', text: ','},
// CHECK:STDOUT: {kind: 'IntLiteral', text: '5'},
// CHECK:STDOUT: {kind: 'ArrayExpr', text: ')', subtree_size: 6},
// CHECK:STDOUT: {kind: 'VarBindingPattern', text: ':', subtree_size: 8},
// CHECK:STDOUT: {kind: 'VariablePattern', text: 'var', subtree_size: 9},
// CHECK:STDOUT: {kind: 'VariableInitializer', text: '='},
// CHECK:STDOUT: {kind: 'TupleLiteralStart', text: '('},
// CHECK:STDOUT: {kind: 'IntLiteral', text: '8'},
// CHECK:STDOUT: {kind: 'TupleLiteralComma', text: ','},
// CHECK:STDOUT: {kind: 'IntLiteral', text: '9'},
// CHECK:STDOUT: {kind: 'TupleLiteralComma', text: ','},
// CHECK:STDOUT: {kind: 'IntLiteral', text: '0x8'},
// CHECK:STDOUT: {kind: 'TupleLiteralComma', text: ','},
// CHECK:STDOUT: {kind: 'IntLiteral', text: '0b1000'},
// CHECK:STDOUT: {kind: 'TupleLiteralComma', text: ','},
// CHECK:STDOUT: {kind: 'IntLiteral', text: '39999999999999999993'},
// CHECK:STDOUT: {kind: 'TupleLiteralComma', text: ','},
// CHECK:STDOUT: {kind: 'TupleLiteral', text: ')', subtree_size: 12},
// CHECK:STDOUT: {kind: 'VariableDecl', text: ';', subtree_size: 24},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: real_literals.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'reals'},
// CHECK:STDOUT: {kind: 'ArrayExprKeyword', text: 'array'},
// CHECK:STDOUT: {kind: 'ArrayExprOpenParen', text: '('},
// CHECK:STDOUT: {kind: 'FloatTypeLiteral', text: 'f64'},
// CHECK:STDOUT: {kind: 'ArrayExprComma', text: ','},
// CHECK:STDOUT: {kind: 'IntLiteral', text: '7'},
// CHECK:STDOUT: {kind: 'ArrayExpr', text: ')', subtree_size: 6},
// CHECK:STDOUT: {kind: 'VarBindingPattern', text: ':', subtree_size: 8},
// CHECK:STDOUT: {kind: 'VariablePattern', text: 'var', subtree_size: 9},
// CHECK:STDOUT: {kind: 'VariableInitializer', text: '='},
// CHECK:STDOUT: {kind: 'TupleLiteralStart', text: '('},
// CHECK:STDOUT: {kind: 'RealLiteral', text: '0.9'},
// CHECK:STDOUT: {kind: 'TupleLiteralComma', text: ','},
// CHECK:STDOUT: {kind: 'RealLiteral', text: '8.0'},
// CHECK:STDOUT: {kind: 'TupleLiteralComma', text: ','},
// CHECK:STDOUT: {kind: 'RealLiteral', text: '80.0'},
// CHECK:STDOUT: {kind: 'TupleLiteralComma', text: ','},
// CHECK:STDOUT: {kind: 'RealLiteral', text: '1.0e7'},
// CHECK:STDOUT: {kind: 'TupleLiteralComma', text: ','},
// CHECK:STDOUT: {kind: 'RealLiteral', text: '1.0e8'},
// CHECK:STDOUT: {kind: 'TupleLiteralComma', text: ','},
// CHECK:STDOUT: {kind: 'RealLiteral', text: '1.0e-8'},
// CHECK:STDOUT: {kind: 'TupleLiteralComma', text: ','},
// CHECK:STDOUT: {kind: 'RealLiteral', text: '39999999999999999993.0e39999999999999999993'},
// CHECK:STDOUT: {kind: 'TupleLiteralComma', text: ','},
// CHECK:STDOUT: {kind: 'TupleLiteral', text: ')', subtree_size: 16},
// CHECK:STDOUT: {kind: 'VariableDecl', text: ';', subtree_size: 28},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: bool_literal.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'f'},
// CHECK:STDOUT: {kind: 'BoolTypeLiteral', text: 'bool'},
// CHECK:STDOUT: {kind: 'VarBindingPattern', text: ':', subtree_size: 3},
// CHECK:STDOUT: {kind: 'VariablePattern', text: 'var', subtree_size: 4},
// CHECK:STDOUT: {kind: 'VariableInitializer', text: '='},
// CHECK:STDOUT: {kind: 'BoolLiteralFalse', text: 'false'},
// CHECK:STDOUT: {kind: 'VariableDecl', text: ';', subtree_size: 8},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 't'},
// CHECK:STDOUT: {kind: 'BoolTypeLiteral', text: 'bool'},
// CHECK:STDOUT: {kind: 'VarBindingPattern', text: ':', subtree_size: 3},
// CHECK:STDOUT: {kind: 'VariablePattern', text: 'var', subtree_size: 4},
// CHECK:STDOUT: {kind: 'VariableInitializer', text: '='},
// CHECK:STDOUT: {kind: 'BoolLiteralTrue', text: 'true'},
// CHECK:STDOUT: {kind: 'VariableDecl', text: ';', subtree_size: 8},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: char_literal.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'c'},
// CHECK:STDOUT: {kind: 'CoreNameExpr', text: 'Core'},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'Char'},
// CHECK:STDOUT: {kind: 'MemberAccessExpr', text: '.', subtree_size: 3},
// CHECK:STDOUT: {kind: 'VarBindingPattern', text: ':', subtree_size: 5},
// CHECK:STDOUT: {kind: 'VariablePattern', text: 'var', subtree_size: 6},
// CHECK:STDOUT: {kind: 'VariableInitializer', text: '='},
// CHECK:STDOUT: {kind: 'CharLiteral', text: ''c''},
// CHECK:STDOUT: {kind: 'VariableDecl', text: ';', subtree_size: 10},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: string_literal.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'VariableIntroducer', text: 'var'},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'test_str'},
// CHECK:STDOUT: {kind: 'StringTypeLiteral', text: 'str'},
// CHECK:STDOUT: {kind: 'VarBindingPattern', text: ':', subtree_size: 3},
// CHECK:STDOUT: {kind: 'VariablePattern', text: 'var', subtree_size: 4},
// CHECK:STDOUT: {kind: 'VariableInitializer', text: '='},
// CHECK:STDOUT: {kind: 'StringLiteral', text: '"Test"'},
// CHECK:STDOUT: {kind: 'VariableDecl', text: ';', subtree_size: 8},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
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