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AK: Add `GenericLexer::consume_escaped_character()'

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...and use it in `consume_and_unescape_string()'.
This commit is contained in:
AnotherTest 2020-10-19 10:05:20 +03:30 committed by Andreas Kling
parent c057225a36
commit 27040e65eb
Notes: sideshowbarker 2024-07-19 01:47:49 +09:00 
Author: https://github.com/alimpfard
Commit: https://github.com/SerenityOS/serenity/commit/27040e65eb9
Pull-request: https://github.com/SerenityOS/serenity/pull/3797
Reviewed-by: https://github.com/benit8
2 changed files with 18 additions and 13 deletions
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28
AK/GenericLexer.cpp
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@ -221,21 +221,25 @@ String GenericLexer::consume_and_unescape_string(char escape_char)
if (view.is_null()) if (view.is_null())
return {}; return {};
// Transform common escape sequences StringBuilder builder;
auto unescape_character = [](char c) { for (size_t i = 0; i < view.length(); ++i)
static const char* escape_map = "n\nr\rt\tb\bf\f"; builder.append(consume_escaped_character(escape_char));
for (size_t i = 0; escape_map[i] != '\0'; i += 2) return builder.to_string();
}
char GenericLexer::consume_escaped_character(char escape_char, const StringView& escape_map)
{
if (!consume_specific(escape_char))
return consume();
auto c = consume();
for (size_t i = 0; i < escape_map.length(); i += 2) {
if (c == escape_map[i]) if (c == escape_map[i])
return escape_map[i + 1]; return escape_map[i + 1];
return c;
};
StringBuilder builder;
for (size_t i = 0; i < view.length(); ++i) {
char c = (view[i] == escape_char) ? unescape_character(view[++i]) : view[i];
builder.append(c);
} }
return builder.to_string();
return c;
} }
// Ignore a number of characters (1 by default) // Ignore a number of characters (1 by default)

1
AK/GenericLexer.h
View file

@ -52,6 +52,7 @@ public:
bool consume_specific(char); bool consume_specific(char);
bool consume_specific(StringView); bool consume_specific(StringView);
bool consume_specific(const char*); bool consume_specific(const char*);
char consume_escaped_character(char escape_char = '\\', const StringView& escape_map = "n\nr\rt\tb\bf\f");
StringView consume(size_t count); StringView consume(size_t count);
StringView consume_all(); StringView consume_all();
StringView consume_line(); StringView consume_line();