Update to v0.6.
This commit is contained in:
Ethiraric
parent
f99a81c3e6
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8 changed files with 233 additions and 6 deletions
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[package]
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[package]
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name = "yaml-rust2"
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name = "yaml-rust2"
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version = "0.5.0"
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version = "0.6.0"
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authors = [
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authors = [
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"Yuheng Chen <yuhengchen@sensetime.com>",
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"Yuheng Chen <yuhengchen@sensetime.com>",
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"Ethiraric <ethiraric@gmail.com>"
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"Ethiraric <ethiraric@gmail.com>"
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@ -15,7 +15,7 @@ Add the following to the Cargo.toml of your project:
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```toml
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```toml
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[dependencies]
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[dependencies]
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yaml-rust2 = "0.5"
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yaml-rust2 = "0.6"
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```
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```
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Use `yaml_rust2::YamlLoader` to load YAML documents and access them as `Yaml` objects:
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Use `yaml_rust2::YamlLoader` to load YAML documents and access them as `Yaml` objects:
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153
parser/documents/2024-03-15-FirstRelease.md
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153
parser/documents/2024-03-15-FirstRelease.md
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# `yaml-rust2`'s first real release
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If you are not interested in how this crate was born and just want to know what differs from `yaml-rust`, scroll down to
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["This release" or click here](#this-release).
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## The why
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Sometime in August 2023, an ordinary developer (that's me) felt the urge to start scribbling about an OpenAPI linter. I
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had worked with the OpenAPI format and tried different linters, but none of them felt right. And me needing 3 different
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linters to lint my OpenAPI was a pain to me. Like any sane person would do, I would write my own (author's note: you are
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not not sane if you wouldn't). In order to get things started, I needed a YAML parser.
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On August 14th 2023, I forked `yaml-rust` and started working on it. The crate stated that some YAML features were not
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yet available and I felt that was an issue I could tackle. I started by getting to know the code, understanding it,
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adding warnings, refactoring, tinkering, documenting, ... . Anything I could do that made me feel that codebase was
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better, I would do it. I wanted this crate to be as clean as it could be.
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## Fixing YAML compliance
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In my quest to understand YAML better, I found [the YAML test suite](https://github.com/yaml/yaml-test-suite/): a
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compilation of corner cases and intricate YAML examples with their expected output / behavior. Interestingly enough,
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there was an [open pull request on yaml-rust](https://github.com/chyh1990/yaml-rust/pull/187) by
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[tanriol](https://github.com/tanriol) which integrated the YAML test suite as part of the crate tests. Comments mention
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that the maintainer wasn't around anymore and that new contributions would probably never be accepted.
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That, however, was a problem for future-past-me, as I was determined (somehow) to have `yaml-rust` pass every single
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test of the YAML test suite. Slowly, over the course of multiple months (from August 2023 to January 2024), I would
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sometimes pick a test from the test suite, fix it, commit and start again. On the 23rd of January, the last commit
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fixing a test was created.
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According to the [YAML test matrix](https://matrix.yaml.info/), there is to this day only 1 library that is fully
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compliant (aside from the Perl parser generated by the reference). This would make `yaml-rust2` the second library to be
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fully YAML-compliant. You really wouldn't believe how much you have to stretch YAML so that it's not valid YAML anymore.
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## Performance
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With so many improvements, the crate was now perfect!.. Except for performance. Adding conditions for every little bit
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of compliance has lead the code to be much more complex and branch-y, which CPUs hate. I was around 20% slower than the
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code was when I started.
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For a bit over 3 weeks, I stared at flamegraphs and made my CPU repeat the same instructions until it could do it
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faster. There have been a bunch of improvements for performance since `yaml-rust`'s last commit. Here are a few of them:
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* Avoid putting characters in a `VecDeque<char>` buffer when we can push them directly into a `String`.
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* Be a bit smarter about reallocating temporaries: it's best if we know the size in advance, but when we don't we can
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sometimes avoid pushing characters 1 at a time.
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* The scanner skips over characters one at a time. When skipping them, it needs to check whether they're a linebreak to
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update the location. Sometimes, we know we skip over a letter (which is not a linebreak). Several "skip" functions
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have been added for specific uses.
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And the big winner, for an around 15% decrease in runtime was: use a statically-sized buffer instead of a dynamically
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allocated one. (Almost) Every character goes from the input stream into the buffer and then gets read from the buffer.
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This means that `VecDeque::push` and `VecDeque::pop` were called very frequently. The former always has to check for
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capacity. Using an `ArrayDeque` removed the need for constant capacity checks, at the cost of a minor decrease in
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performance if a line is deeply indented. Hopefully, nobody has 42 nested YAML objects.
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Here is in the end the performance breakdown:
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Here is a shot description of what the files contain:
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* `big`: A large array of records with few fields. One of the fields is a description, a large text block scalar
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spanning multiple lines. Most of the scanning happens in block scalars.
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* `nested`: Very short key-value pairs that nest deeply.
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* `small_objects`: A large array of 2 key-value mappings.
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* `strings_array`: A large array of lipsum one-liners (~150-175 characters in length).
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As you can see, `yaml-rust2` performs better than `yaml-rust` on every benchmark. However, when compared against the C
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[`libfyaml`](https://github.com/pantoniou/libfyaml), we can see that there is still much room for improvement.
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I'd like to end this section with a small disclaimer: I am not a benchmark expert. I tried to have an heterogenous set
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of files that would highlight how the parser performs when stressed different ways. I invite you to take a look at [the
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code generating the YAML files](https://github.com/Ethiraric/yaml-rust2/tree/master/tools/gen_large_yaml) and, if you
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are more knowledgeable than I am, improve upon them. `yaml-rust2` performs better with these files because those are the
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ones I could work with. If you find a fil with which `yaml-rust2` is slower than `yaml-rust`, do file an issue!
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## This release
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### Improvements from `yaml-rust`
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This release should improve over `yaml-rust` over 3 major points:
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* Performance: We all love fast software. I want to help you achieve it. I haven't managed to make this crate twice as
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fast, but you should notice a 15-20% improvement in performance.
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* Compliance: You may not notice it, since I didn't know most of the bugs I fixed were bugs to begin with, but this
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crate should now be fully YAML-comliant.
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* Documentation: The documentation of `yaml-rust` is unfortunately incomplete. Documentation here is not exhaustive,
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but most items are documented. Notably, private items are documented, making it much easier to understand where
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something happens. There are also in-code comments that help figure out what is going on under the hood.
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Also, last but not least, I do plan on keeping this crate alive as long as I can. Nobody can make promises on that
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regard, of course, but I have poured hours of work into this, and I would hate to see this go to waste.
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### Switching to `yaml-rust2`
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This release is `v0.6.0`, chosen to explicitly differ in minor from `yaml-rust`. `v0.4.x` does not exist in this crate
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to avoid any confusion between the 2 crates.
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Switching to `yaml-rust2` should be a very simple process. Change your `Cargo.toml` to use `yaml-rust2` instead of
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`yaml-rust`:
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```diff
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-yaml-rust = "0.4.4"
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+yaml-rust2 = "0.6.0"
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```
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As for your code, you have one of two solutions:
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* Changing your imports from `use yaml_rust::Yaml` to `use yaml_rust2::Yaml` if you import items directly, or change
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occurences of `yaml_rust` to `yaml_rust2` if you use fully qualified paths.
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* Alternatively, you can alias `yaml_rust2` with `use yaml_rust2 as yaml_rust`. This would keep your code working if
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you use fully qualified paths.
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Whichever you decide is up to you.
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#### What about API breakage?
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Most of what I have changed is in the implementation details. You might notice more documentation appearing on your LSP,
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but documentation isn't bound by the API. There is only one change I made that could lead to compile errors. It is
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unlikely you used that feature, but I'd hate to leave this undocumented.
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If you use the low-level event parsing API (`Parser`,
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`EventReceiver` / `MarkedEventReceiver`) and namely the `yaml_rust::Event` enumeration, there is one change that might
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break your code. This was needed for tests in the YAML test suite. In `yaml-rust`, YAML tags are not forwarded from the
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lower-level `Scanner` API to the low-level `Parser` API.
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Here is the change that was made in the library:
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```diff
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pub enum Event {
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// ...
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-SequenceStart(usize),
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-MappingStart(usize),
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+SequenceStart(usize, Option<Tag>),
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+MappingStart(usize, Option<Tag>),
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// ...
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}
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```
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This means that you may now see YAML tags appearing in your code.
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## Closing words
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YAML is hard. Much more than I had anticipated. If you are exploring dark corners of YAML that `yaml-rust2` supports but
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`yaml-rust` doesn't, I'm curious to know what it is.
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Work on this crate is far from over. I will try and match `libfyaml`'s performance. Today is the first time I benched
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against it, and I wouldn't have guessed it to outperform `yaml-rust2` that much.
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If you're interested in upgrading your `yaml-rust` crate, please do take a look at [davvid](https://github.com/davvid)'s
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[fork of `yaml-rust`](https://github.com/davvid/yaml-rust). Very recent developements on this crate sparked from an
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[issue on advisory-db](https://github.com/rustsec/advisory-db/issues/1921) about the unmaintained state of `yaml-rust`.
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I hope it will be that YAML in Rust will improve following this issue.
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Thank you for reading through this. If you happen to have issues with `yaml-rust2` or suggestions, do [drop an
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issue](https://github.com/Ethiraric/yaml-rust2/issues)!
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If however you wanted an OpenAPI linter, I'm afraid you're out of luck. Just as much as I'm out of time ;)
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-Ethiraric
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5
parser/documents/img/2024-03-15-benchmarks.csv
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5
parser/documents/img/2024-03-15-benchmarks.csv
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,yaml-rust2,yaml-rust,libfyaml
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big.yaml,1644933464,2097747837,1642761913
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nested.yaml,1186706803,1461738560,1104480120
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small_objects.yaml,5459915062,5686715239,4402878726
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strings_array.yaml,1698194153,2044921291,924246153
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parser/documents/img/benchmarks-v0.6.svg
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parser/documents/img/benchmarks-v0.6.svg
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
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<svg width="177mm" height="92mm" viewBox="0 0 17700 9200" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" stroke-width="28.222" stroke-linejoin="round" xml:space="preserve">
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<path fill="none" stroke="rgb(179,179,179)" stroke-linejoin="round" d="M 15027,3028 L 2926,3028"/>
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<path fill="none" stroke="rgb(179,179,179)" stroke-linejoin="round" d="M 12001,8497 L 12001,8347"/>
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<path fill="none" stroke="rgb(179,179,179)" stroke-linejoin="round" d="M 15027,8497 L 15027,8347"/>
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<path fill="none" stroke="rgb(179,179,179)" stroke-linejoin="round" d="M 15027,8497 L 15027,8347"/>
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<path fill="none" stroke="rgb(179,179,179)" stroke-linejoin="round" d="M 2926,8347 L 15027,8347"/>
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<path fill="none" stroke="rgb(179,179,179)" stroke-linejoin="round" d="M 2776,8347 L 2926,8347"/>
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<path fill="none" stroke="rgb(179,179,179)" stroke-linejoin="round" d="M 2776,8347 L 2926,8347"/>
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<path fill="none" stroke="rgb(179,179,179)" stroke-linejoin="round" d="M 2776,7017 L 2926,7017"/>
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<path fill="none" stroke="rgb(179,179,179)" stroke-linejoin="round" d="M 2776,7017 L 2926,7017"/>
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<path fill="none" stroke="rgb(179,179,179)" stroke-linejoin="round" d="M 2776,5687 L 2926,5687"/>
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<path fill="none" stroke="rgb(179,179,179)" stroke-linejoin="round" d="M 2776,4358 L 2926,4358"/>
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<path fill="none" stroke="rgb(179,179,179)" stroke-linejoin="round" d="M 2776,4358 L 2926,4358"/>
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<path fill="none" stroke="rgb(179,179,179)" stroke-linejoin="round" d="M 2776,3028 L 2926,3028"/>
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<path fill="none" stroke="rgb(179,179,179)" stroke-linejoin="round" d="M 2776,3028 L 2926,3028"/>
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<path fill="none" stroke="rgb(179,179,179)" stroke-linejoin="round" d="M 2776,1698 L 2926,1698"/>
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<path fill="none" stroke="rgb(179,179,179)" stroke-linejoin="round" d="M 2776,368 L 2926,368"/>
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<path fill="none" stroke="rgb(179,179,179)" stroke-linejoin="round" d="M 2776,368 L 2926,368"/>
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<path fill="rgb(189,215,238)" stroke="none" d="M 13892,8347 L 14648,8347 14648,7117 13892,7117 13892,8347 Z"/>
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<text class="SVGTextShape"><tspan class="TextParagraph"><tspan class="TextPosition" x="4213" y="8915"><tspan font-family="Liberation Sans, sans-serif" font-size="353px" font-weight="400" fill="rgb(0,0,0)" stroke="none" style="white-space: pre">big</tspan></tspan></tspan></text>
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<text class="SVGTextShape"><tspan class="TextParagraph"><tspan class="TextPosition" x="6948" y="8915"><tspan font-family="Liberation Sans, sans-serif" font-size="353px" font-weight="400" fill="rgb(0,0,0)" stroke="none" style="white-space: pre">nested</tspan></tspan></tspan></text>
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<text class="SVGTextShape"><tspan class="TextParagraph"><tspan class="TextPosition" x="9456" y="8915"><tspan font-family="Liberation Sans, sans-serif" font-size="353px" font-weight="400" fill="rgb(0,0,0)" stroke="none" style="white-space: pre">small_objects</tspan></tspan></tspan></text>
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</svg>
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After Width: | Height: | Size: 9.7 KiB |
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@ -11,7 +11,7 @@
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//!
|
//!
|
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//! ```toml
|
//! ```toml
|
||||||
//! [dependencies]
|
//! [dependencies]
|
||||||
//! yaml-rust2 = "0.5.0"
|
//! yaml-rust2 = "0.6.0"
|
||||||
//! ```
|
//! ```
|
||||||
//!
|
//!
|
||||||
//! # Examples
|
//! # Examples
|
||||||
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|
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||||||
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|
@ -1,6 +1,6 @@
|
||||||
[package]
|
[package]
|
||||||
name = "bench_compare"
|
name = "bench_compare"
|
||||||
version = "0.5.0"
|
version = "0.6.0"
|
||||||
authors = [
|
authors = [
|
||||||
"Ethiraric <ethiraric@gmail.com>"
|
"Ethiraric <ethiraric@gmail.com>"
|
||||||
]
|
]
|
||||||
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|
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||||||
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|
@ -1,6 +1,6 @@
|
||||||
[package]
|
[package]
|
||||||
name = "gen_large_yaml"
|
name = "gen_large_yaml"
|
||||||
version = "0.5.0"
|
version = "0.6.0"
|
||||||
authors = [
|
authors = [
|
||||||
"Ethiraric <ethiraric@gmail.com>"
|
"Ethiraric <ethiraric@gmail.com>"
|
||||||
]
|
]
|
||||||
|
|
@ -11,7 +11,7 @@ readme = "README.md"
|
||||||
edition = "2018"
|
edition = "2018"
|
||||||
|
|
||||||
[dependencies]
|
[dependencies]
|
||||||
yaml-rust2 = { version = "0.5.0", path = "../../" }
|
yaml-rust2 = { version = "0.6.0", path = "../../" }
|
||||||
rand = "0.8.5"
|
rand = "0.8.5"
|
||||||
lipsum = "0.9.0"
|
lipsum = "0.9.0"
|
||||||
|
|
||||||
|
|
|
||||||
Loading…
Reference in a new issue