Text transforms in placeholders — Developer Guide

5.2.0 · #317 (from discussion #298, by Shadowtech87) · User guide: Starters and leavers § Questions · Module guide: Starters and leavers - Developer Guide

🔑 The one-line version

{First name|initial|upper} - a placeholder can now work a value out on its way into text, not just copy it. One shared file, includes/text_transforms.php, does it. Starters & leavers step text is the first place it is used. Forms' actions and workflow variables can use the same function later.

Why

A starter's steps need values worked out from the form's answers: a PC name ORG-JSMITH, a username jsmith, an email address [email protected]. Before this, the analyst worked them out by hand, and two people worked them out two ways. Shadowtech87's previous tool did it for them.

📁 Files

File	What
includes/text_transforms.php	TEXT_TRANSFORMS, textTransform(), textToAscii(), textFillPlaceholders()
includes/starters/service.php	StartersService::fillAnswers() builds the name => value map and calls textFillPlaceholders()
assets/js/starters-settings.js (v=6)	A one-line hint under the {Question} buttons in the template editor (settings.chips_hint)
lang/en/starters.php, starters/help.php	The hint, and help paragraph help.questions.p5 (the section now has 5 paragraphs)
tests/text-transforms.php	26 checks, needs no database

🧰 The transforms

Applied left to right. Names are case- and space-insensitive.

Name	Does	John Paul →
initial	the first letter (multi-byte safe: Émile → É)	J
first	the first word	John
last	the last word	Paul
upper / lower	capitals / small letters	JOHN PAUL / john paul
nospace	spaces taken out	JohnPaul
slug	lower case, accents folded, every run of anything not a-z / 0-9 becomes .	john.paul
ascii	letters folded to plain A-Z: José → Jose, Łukasz → Lukasz	John Paul

function textTransform(string $value, array $names): ?string   // null = a name is not a transform
function textFillPlaceholders(string $text, array $map): string  // $map: lower-case name => value

textFillPlaceholders('ORG-{First name|initial|upper}{Last name|upper|nospace}',
                     ['first name' => 'John', 'last name' => 'Smith']);   // "ORG-JSMITH"

textToAscii() uses ICU's Transliterator('Any-Latin; Latin-ASCII') when the intl extension is there. Unlike stripping accent marks, that also folds letters such as Ł and ø. Without intl it falls back to Normalizer (decompose, then drop the marks), and without that it leaves the value as it is.

⚠️ Rules that matter

• 🔑 A typo is never silent. An unknown transform makes textTransform() answer null, and the whole placeholder is left exactly as typed (ORG-{Last name|uper}). An unknown question is left as typed too, as it always was. Someone reading the step sees the mistake. They never get a quietly wrong PC name.
• A short, plain-word list - not a formula language. Adding substr(2,3) or if here turns step text into code nobody can read. A new transform needs a real need, a plain name, a row in the table above, and a test.
• Placeholders are matched case-insensitively by the question's wording ($map keys are lower case), as before. That is why a new version of a form keeps working.

🧪 Tests

• tests/text-transforms.php (26, no database):
  • every transform, with a multi-byte initial, ascii folding Ł, and names given in any case;
  • an unknown transform giving null;
  • the issue's three examples (ORG-JSMITH, jsmith, [email protected]);
  • a misspelt transform, and an unknown question, left as typed;
  • an empty answer;
  • two checks through StartersService::fillAnswers().
• tests/starters.php (46, prtest) still passes. It fills {Question} in real step text.

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See also: Starters and leavers - Developer Guide · Starters steps as tickets - design (#316, whose ticket steps will use the same transforms)