feat(xmlgen): built-in helper library and caller resolvers (2/4) - #201
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This repository does not receive automatic reviews because it has fewer than 10 stars. ⚙️ Run configurationConfiguration used: defaults Review profile: CHILL Plan: Advanced Run ID: 📝 WalkthroughWalkthroughThe change adds nine built-in template helpers, caller-supplied context-aware resolvers, resolver-specific errors and name validation, concurrent resolver execution support, and an exported ChangesTemplate functions
Resolver registration and execution
Template validation API
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Caller
participant Generate
participant Resolver
participant TemplateOutput
Caller->>Generate: provide template, context, and WithResolvers
Generate->>Resolver: invoke registered resolver with template arguments
Resolver-->>Generate: return value or wrapped error
Generate->>TemplateOutput: XML-escape and render result
Merge Risk: 🟡 Moderate · up to Templates formatting large JSON amounts can emit a different value in generated XML. Preserve exact numeric text before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 69.23% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 39 functions across 9 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 2📝 Generate docstrings 💡
🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@xmlgen/helpers.go`:
- Line 30: Update the number conversion used by fnDecimal instead of parsing
through strconv.ParseFloat, preserving the raw JSON number exactly with a
decimal or rational representation while retaining fixed-place formatting. Add a
raw-JSON regression test verifying that an integer beyond float64 precision,
such as 9007199254740993, remains exact when rendered with decimal.
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📒 Files selected for processing (10)
xmlgen/README.mdxmlgen/errors.goxmlgen/funcs.goxmlgen/helpers.goxmlgen/helpers_test.goxmlgen/resolvers.goxmlgen/resolvers_test.goxmlgen/rewrite_internal_test.goxmlgen/xmlgen.goxmlgen/xmlgen_test.go
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Check these issues:
decimal treats a missing key, JSON null, and an empty string as numeric zero, so {{ decimal .fob 2 }} writes 0.00 into the document. I rendered all three cases; each produced 0.00. date does the opposite on empty input (it emits nothing), and the package already documents that an absent key renders as the empty string. On a declaration, a missing amount becoming 0.00 is a silent data change of the kind this module exists to prevent.
rational is where that happens: whitespace is trimmed, then s == "" returns new(big.Rat) instead of stopping.
Fix fnDecimal the same way fnDate already does. After converting the value to text, if the trimmed string is empty, return "" and do not format. Keep the exact big.Rat path for real numbers. Please add tests for a missing key, null, and "", next to the existing decimal cases, asserting the element body is empty rather than 0.00.
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Valid — reproduced all three cases before changing anything, and you're right that it's the one silent data change left in the helper set:
The fix is where you pointed. The distinction that matters and is now pinned by its own test: absent is not zero, but zero is still zero. Tests added next to the existing decimal cases, as asked: missing key, Your comment prompted me to audit the other eight helpers for the same defect. An absent list joined to nothing, but an empty string — which is how an absent list often arrives from a form — errored. On scope: README now states the rule once, for the whole helper set: an absent value stays absent; a value that really is zero still formats. 166 subtests, race-clean, 0 lint issues. #202 and #200 rebased on top. |
The engine renders and escapes, but a template still has to turn form data
into the shapes a receiving system expects. This adds the vocabulary it does
that with.
Nine built-in helpers, pure and deterministic, needing no configuration:
part and split for a value the document spreads across several elements,
date for moving between layouts, decimal for a fixed-decimal amount, lookup
for an enum encoded as something else, zero, coalesce, join and trim. Having
these in the box is what keeps Generate(ctx, tmpl, data) sufficient for most
templates rather than something every caller has to furnish first.
decimal holds its value as an exact rational rather than a float64. Data is
decoded with UseNumber precisely so a number keeps the text it was written
with, and rounding that text through a float would throw the exactness away
again at the last step: an integer past 2^53 would shift, and a fraction
would be rounded from its nearest binary approximation rather than from what
was written. A half now rounds away from zero -- commercial rounding -- and
a magnitude past roughly 1200 digits is refused rather than expanded, since
nine characters of exponent would otherwise produce a megabyte of digits.
zero earns its place: data decoded with UseNumber carries numbers as
json.Number, a string underneath, so {{ if .quantity }} is true even when the
quantity is 0. Without it a template that renders an empty-value marker for
a zero quietly renders the zero instead.
Resolvers are the escape hatch for what the data cannot supply at all -- a
code-list description from a database, a rate from another service. Each is
registered under its own name, so a template calling one that was not
supplied fails when the template is parsed rather than at execution on
whichever branch happens to reach it. Names are validated first because
text/template's Funcs panics on a name that is not a Go identifier: a
resolver called "code-list" would otherwise take down the process rather
than fail the request. break and continue are reserved too -- they are
keywords only while no function of that name exists, so registering one
would silently change what every existing {{ break }} does. A resolver's own
error stays reachable through text/template's wrapping, so errors.Is matches
both ErrResolver and the caller's sentinel.
Also adds Validate, which checks a template without rendering it, so a
broken one fails when it is stored rather than when someone submits.
Refs #189
Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
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Problem
The engine in #199 renders and escapes, but a template still has to turn form data into the shapes a receiving system expects: a reference the document spreads across four elements, a date in another layout, an enum encoded as a number. With no vocabulary for that, every caller has to supply its own before rendering anything.
Changes
Nine built-in helpers — pure, deterministic, no configuration — plus an extension point for what the data cannot supply at all.
part{{ part .ref "/" 0 }}on"OFF1/A/42/2026"OFF1— past the end gives"", not an errorsplit{{ range split .codes "," }}join{{ join .tags "-" }}a-b-cdate{{ date .day "2006-01-02" "1/2/06" }}3/4/26— a non-matching layout is an error, never a guessdecimal{{ decimal .fob 2 }}on14001400.00— exact, not viafloat64lookup{{ lookup .flag "yes" "1" "no" "0" }}1— unmapped values pass throughzero{{ if zero .gain }}"",false, numeric zerocoalesce{{ coalesce .a .b "n/a" }}trim{{ trim .name }}Generate(ctx, tmpl, data)sufficient for most templates.text/template'sFuncspanics on a name that is not a Go identifier: a resolver called"code-list"would otherwise take down the process rather than fail the request.zeroexists becauseUseNumbercarries numbers asjson.Number, a string underneath — so{{ if .quantity }}is true even when the quantity is0, and a template rendering an empty-value marker for a zero would quietly render the zero instead.nulland an empty string render as nothing rather than as0.00— writing a figure the data never carried would silently change the document. A value that really is0still formats. The same rule now holds forjoin, where an empty string previously errored.decimalholds its value as an exact rational (math/big, stdlib) rather than afloat64. Rounding through a float would undo at the last step the exactnessUseNumberpreserves from the JSON text:9007199254740993would shift to…992, and2.355would round down because as a float it is really2.35499…. A half now rounds away from zero, and a magnitude past ~1200 digits is refused rather than expanded.Validatechecks a template without data, so a broken one fails when it is stored rather than when someone submits.Testing
166 subtests cumulative (66 added), race-clean, 0 lint issues. Covers each helper's edge case, resolvers receiving the caller's real Go types,
ctxround-tripping, a resolver error matching bothErrResolverand the caller's own sentinel, a panicking resolver being recovered, invalid resolver names erroring rather than panicking, and call-counting across untaken branches and variable binding.Related
Implements #189. Stacked chain — 2 of 4:
#199 engine (merged) → #201 (this) → #202 golden fixtures → #200 failure paths
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