Zach Nelson
b5b1f650e2
## Summary Use `std::string_view` and case-insensitive comparisons to avoid string allocations during CSS parsing. **Hot path:** `resolveStyle` (called per HTML start tag during chapter rendering) now does zero heap allocations. Previously it allocated a normalized tag string, a vector of class strings, and a composite key per class. For a chapter with ~2000 tags × 2 classes each, that's ~12 000 small short-lived allocations eliminated per page render — primarily a heap-fragmentation win on the ESP32-C3's ~380KB RAM. **Cold path:** CSS load no longer allocates per-rule selector vectors or per-token strings; `splitOnChar`/`splitWhitespace` are gone, replaced with callback-based tokenization (`forEachDelimitedToken`). **Behavioral notes:** - The selector `unordered_map` now uses an ASCII-case-insensitive hash/equal. Selectors are stored with their original case rather than pre-lowercased; the observable lookup result is unchanged. - `stripTrailingImportant` is now case-insensitive (per CSS spec; previously matched only lowercase `!important`). **Cache compatibility:** `CSS_CACHE_VERSION` unchanged. Old caches (lowercase selectors) load correctly under the new lookup; new caches will contain verbatim-case selectors — both forms work. --- ### AI Usage Did you use AI tools to help write this code? _**PARTIALLY**_
This directory is intended for project specific (private) libraries.
PlatformIO will compile them to static libraries and link into the executable file.
The source code of each library should be placed in a separate directory
("lib/your_library_name/[Code]").
For example, see the structure of the following example libraries `Foo` and `Bar`:
|--lib
| |
| |--Bar
| | |--docs
| | |--examples
| | |--src
| | |- Bar.c
| | |- Bar.h
| | |- library.json (optional. for custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
| |
| |--Foo
| | |- Foo.c
| | |- Foo.h
| |
| |- README --> THIS FILE
|
|- platformio.ini
|--src
|- main.c
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```
#include <Foo.h>
#include <Bar.h>
int main (void)
{
...
}
```
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