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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| // 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 | ||
|
|
||
| #include "toolchain/diagnostics/format_providers.h" | ||
|
|
||
| #include "common/check.h" | ||
| #include "llvm/ADT/StringExtras.h" | ||
|
|
||
| auto llvm::format_provider<Carbon::BoolAsSelect>::format( | ||
| const Carbon::BoolAsSelect& wrapper, raw_ostream& out, StringRef style) | ||
| -> void { | ||
| if (style.empty()) { | ||
| llvm::format_provider<bool>::format(wrapper.value, out, style); | ||
| return; | ||
| } | ||
|
|
||
| // Remove wrapping quotes if present. | ||
| if (style.starts_with('\'') && style.ends_with('\'')) { | ||
| style = style.drop_front().drop_back(); | ||
| } | ||
|
|
||
| auto sep = style.find('|'); | ||
| CARBON_CHECK( | ||
| sep != llvm::StringRef::npos, | ||
| "BoolAsSelect requires a `|` separating true and false results: `{0}`", | ||
| style); | ||
| CARBON_CHECK(style.find('|', sep + 1) == llvm::StringRef::npos, | ||
| "BoolAsSelect only allows one `|`: `{0}`", style); | ||
|
|
||
| if (wrapper.value) { | ||
| out << style.take_front(sep); | ||
| } else { | ||
| out << style.drop_front(sep + 1); | ||
| } | ||
| } | ||
|
|
||
| auto llvm::format_provider<Carbon::IntAsSelect>::format( | ||
| const Carbon::IntAsSelect& wrapper, raw_ostream& out, StringRef style) | ||
| -> void { | ||
| if (style.empty()) { | ||
| llvm::format_provider<int>::format(wrapper.value, out, style); | ||
| return; | ||
| } | ||
|
|
||
| // Remove wrapping quotes if present. | ||
| if (style.starts_with('\'') && style.ends_with('\'')) { | ||
| style = style.drop_front().drop_back(); | ||
| } | ||
|
|
||
| auto cursor = style; | ||
| while (!cursor.empty()) { | ||
| auto case_sep = cursor.find("|"); | ||
| auto token = cursor.substr(0, case_sep); | ||
| if (case_sep == llvm::StringRef::npos) { | ||
| cursor = llvm::StringRef(); | ||
| } else { | ||
| cursor = cursor.drop_front(case_sep + 1); | ||
| } | ||
|
|
||
| auto pair_sep = token.find(':'); | ||
| CARBON_CHECK(pair_sep != llvm::StringRef::npos, | ||
| "IntAsSelect requires a `:` separating each comparison and " | ||
| "output string: `{0}`", | ||
| style); | ||
|
|
||
| auto comp = token.take_front(pair_sep); | ||
| auto output_string = token.drop_front(pair_sep + 1); | ||
|
|
||
| if (comp.empty()) { | ||
| // Default case. | ||
| CARBON_CHECK(cursor.empty(), | ||
| "IntAsSelect requires the default case be last: `{0}`", | ||
| style); | ||
| out << output_string; | ||
| return; | ||
| } else if (comp.consume_front("=")) { | ||
| // Equality comparison. | ||
| int value; | ||
| CARBON_CHECK(to_integer(comp, value), | ||
| "IntAsSelect has invalid value in comparison: `{0}`", style); | ||
| if (value == wrapper.value) { | ||
| out << output_string; | ||
| return; | ||
| } | ||
| } else { | ||
| CARBON_FATAL("IntAsSelect has unrecognized comparison: `{0}`", style); | ||
| } | ||
| } | ||
|
|
||
| CARBON_FATAL("IntAsSelect doesn't handle `{0}`: `{1}`", wrapper.value, style); | ||
| } |
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