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Informations about the package code-utils
kynx/code-utils
Utilities for generating PHP code.
Normalizers
The normalizers generate readable PHP labels (class names, namespaces, property names, etc) from valid UTF-8 strings, transliterating them to ASCII and spelling out any invalid characters.
Usage
The following code (forgive the Japanese - a certain translation tool tells me it means "Pet Store"):
outputs:
and:
outputs:
See the tests for more examples.
Why?
You must never run code generated from untrusted user input. But there are a few cases where you do want to output code generated from (mostly) trusted input.
In my case, I need to generate classes and properties from an OpenAPI specification. There are no hard-and-fast rules on the characters present, just a vague "it is RECOMMENDED to follow common programming naming conventions". Whatever they are.
How?
Each normalizer uses ext-intl's Transliterator to turn the UTF-8 string into Latin-ASCII. Where a character has no
equivalent in ASCII (the "€" symbol is a good example), it uses the Unicode name of the character to spell it out (to
Euro, after some minor clean-up). For ASCII characters that are not valid in a PHP label, it provides its own spell
outs. For instance, a backtick "`" becomes Backtick.
Initial digits are also spelt out: "123foo" becomes OneTwoThreeFoo. Finally reserved words are suffixed with a
user-supplied string so they don't mess things up. In the first usage example above, if we normalized "class" it would
become ClassController.
The results may not be pretty. If for some mad reason your input contains ͖ - put your glasses on! - the label will
contain CombiningRightArrowheadAndUpArrowheadBelow. But it is valid PHP, and stands a chance of being as unique as
the original. Which brings me to...
Unique labelers
The normalization process reduces around a million Unicode code points down to just 162 ASCII characters. Then it mangles the label further by stripping separators, reducing whitespace and turning it into camelCase, snake_case or whatever your programming preference. It's gonna be lossy - nothing we can do about that.
The unique labelers' job is to add back lost uniqueness, using a UniqueStrategyInterface to decorate any non-unique
class names in the list it is given.
To guarantee uniqueness within a set of class name labels, use the UniqueClassLabeller:
outputs:
There are labelers for each of the normalizers: UniqueClassLabeler, UniqueConstantLabeler, UniquePropertyLabeler
and UniqueVariableLabeler. Along with the NumberSuffix implementation of UniqueStrategyInterface, we provide a
SpellOutOrdinalPrefix strategy. Using that instead of NumberSuffix above would output:
Kinda cute, but a bit verbose for my taste.
All versions of code-utils with dependencies
ext-intl Version *