print as html
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// Package html renders an internal.AggregatorWriter as a complete,
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// standalone HTML document built around the same table fragment produced by
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// pretty.PrettyPrinter.RenderHTML. The document includes the Bootstrap 5.3
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// stylesheet via CDN and embeds the raw table fragment without HTML-escaping
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// it so the result opens directly in a browser.
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package html
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import (
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"fmt"
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"html/template"
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"io"
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"time"
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"github.com/nmoniz/any2anexoj/internal"
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"github.com/nmoniz/any2anexoj/internal/writing/pretty"
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)
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// bootstrapCSSURL is the jsDelivr CDN URL for Bootstrap 5.3.3.
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const bootstrapCSSURL = "https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css"
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// bootstrapIntegrity is the official SRI hash for Bootstrap 5.3.3 css.
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const bootstrapIntegrity = "sha384-QWTKZyjpPEjISv5WaRU9OFeRpok6YctnYmDr5pNlyT2bRjXh0JMhjY6hW+ALEwIH"
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// HTMLWriter writes a complete HTML document for an AggregatorWriter.
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type HTMLWriter struct {
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output io.Writer
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printer *pretty.PrettyPrinter
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title string
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lang string
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}
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// NewHTMLWriter builds an HTMLWriter that writes a complete HTML document to
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// w. The printer is used purely as a source for the raw <table> fragment via
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// RenderHTML; this writer never invokes Render or any method that writes to
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// printer's own io.Writer.
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func NewHTMLWriter(w io.Writer, printer *pretty.PrettyPrinter, title, lang string) *HTMLWriter {
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return &HTMLWriter{
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output: w,
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printer: printer,
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title: title,
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lang: lang,
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}
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}
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// documentTemplate renders the full HTML page. The table fragment is typed as
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// template.HTML so the template engine emits it verbatim without escaping
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// the angle brackets in the <table> markup.
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var documentTemplate = template.Must(template.New("html").Parse(`<!DOCTYPE html>
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<html lang="{{.Lang}}">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>{{.Title}}</title>
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<link rel="stylesheet" href="{{.CSSURL}}" integrity="{{.Integrity}}" crossorigin="anonymous">
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</head>
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<body>
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<main class="container-fluid py-4">
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<h1>{{.Title}}</h1>
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<div class="table-responsive">
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{{.TableFragment}}
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</div>
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<p class="text-muted small">Generated at {{.GeneratedAt}}</p>
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</main>
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</body>
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</html>
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`))
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// Render writes a complete standalone HTML document for aw to the configured
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// output. The same HTMLWriter may be reused; each call rebuilds the table
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// fragment from aw so the rendered <tr> count reflects aw's current items and
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// no rows are duplicated across invocations.
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func (hw *HTMLWriter) Render(aw *internal.AggregatorWriter) error {
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if hw.printer == nil {
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return fmt.Errorf("html: nil printer")
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}
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fragment := hw.printer.RenderHTML(aw)
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data := struct {
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Lang string
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Title string
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CSSURL string
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Integrity string
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TableFragment template.HTML
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GeneratedAt string
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}{
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Lang: hw.lang,
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Title: hw.title,
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CSSURL: bootstrapCSSURL,
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Integrity: bootstrapIntegrity,
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TableFragment: template.HTML(fragment),
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GeneratedAt: time.Now().UTC().Format(time.RFC3339),
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}
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if err := documentTemplate.Execute(hw.output, data); err != nil {
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return fmt.Errorf("render html document: %w", err)
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}
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return nil
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}
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@@ -0,0 +1,184 @@
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package html_test
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import (
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"bytes"
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"strings"
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"testing"
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"time"
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htmlwriter "github.com/nmoniz/any2anexoj/internal/writing/html"
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"github.com/nmoniz/any2anexoj/internal/writing/pretty"
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"github.com/nmoniz/any2anexoj/internal/writing"
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"github.com/nmoniz/any2anexoj/internal"
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"github.com/shopspring/decimal"
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)
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// buildTestAggregator returns an AggregatorWriter seeded with two
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// deterministic ReportItems so every test can assert on a stable document
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// shape. Mirrors the fixture pattern used in
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// internal/writing/pretty/printer_test.go.
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func buildTestAggregator(t *testing.T) *internal.AggregatorWriter {
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t.Helper()
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aw := internal.NewAggregatorWriter()
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ctx := t.Context()
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err := aw.Write(ctx, internal.ReportItem{
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Symbol: "AAPL",
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Nature: internal.NatureG01,
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BrokerCountry: 826,
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AssetCountry: 840,
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BuyValue: decimal.NewFromFloat(100.50),
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BuyTimestamp: time.Date(2023, 1, 15, 0, 0, 0, 0, time.UTC),
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SellValue: decimal.NewFromFloat(150.75),
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SellTimestamp: time.Date(2023, 6, 20, 0, 0, 0, 0, time.UTC),
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Fees: decimal.NewFromFloat(2.50),
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Taxes: decimal.NewFromFloat(5.00),
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})
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if err != nil {
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t.Fatalf("failed to write first report item: %v", err)
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}
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err = aw.Write(ctx, internal.ReportItem{
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Symbol: "GOOGL",
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Nature: internal.NatureG20,
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BrokerCountry: 826,
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AssetCountry: 840,
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BuyValue: decimal.NewFromFloat(200.00),
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BuyTimestamp: time.Date(2023, 3, 10, 0, 0, 0, 0, time.UTC),
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SellValue: decimal.NewFromFloat(225.50),
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SellTimestamp: time.Date(2023, 9, 5, 0, 0, 0, 0, time.UTC),
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Fees: decimal.NewFromFloat(3.00),
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Taxes: decimal.NewFromFloat(7.50),
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})
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if err != nil {
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t.Fatalf("failed to write second report item: %v", err)
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}
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return aw
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}
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func TestHTMLWriter_Render(t *testing.T) {
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loc, err := writing.NewLocalizer("en")
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if err != nil {
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t.Fatalf("create localizer: %v", err)
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}
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var buf bytes.Buffer
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// RenderHTML never writes to the printer's output, so Discard is safe.
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pp := pretty.NewPrettyPrinter(&buf, loc)
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hw := htmlwriter.NewHTMLWriter(&buf, pp, "Tax report", "en")
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if err := hw.Render(buildTestAggregator(t)); err != nil {
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t.Fatalf("Render returned an error: %v", err)
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}
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got := buf.String()
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wantSubstrings := []string{
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"<!DOCTYPE html>",
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`<html lang="en">`,
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`<meta charset="utf-8">`,
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`<meta name="viewport" content="width=device-width, initial-scale=1">`,
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`<title>Tax report</title>`,
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`https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css`,
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`integrity="`,
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`crossorigin="anonymous"`,
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`<main class="container-fluid py-4">`,
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`<h1>Tax report</h1>`,
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`<div class="table-responsive">`,
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`<table class="table table-striped table-hover table-bordered">`,
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`</table>`,
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`<tfoot>`,
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`</tfoot>`,
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`</html>`,
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`<p class="text-muted small">Generated at `,
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}
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for _, s := range wantSubstrings {
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if !strings.Contains(got, s) {
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t.Errorf("rendered HTML missing expected substring %q\nGot:\n%s", s, got)
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}
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}
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// The table fragment must be embedded as raw HTML, not escaped.
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if strings.Contains(got, "<table") {
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t.Errorf("table fragment appears to be HTML-escaped; expected raw <table> markup\nGot:\n%s", got)
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}
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if !strings.Contains(got, "<table") {
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t.Errorf("expected raw <table> tag in output\nGot:\n%s", got)
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}
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// Generated timestamp must be valid RFC3339 UTC.
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startIdx := strings.Index(got, "Generated at ")
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if startIdx == -1 {
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t.Fatalf("missing 'Generated at' prefix in output")
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}
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timestampLine := got[startIdx:]
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endIdx := strings.Index(timestampLine, "</p>")
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if endIdx == -1 {
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t.Fatalf("missing </p> closing tag after 'Generated at' line")
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}
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timestampStr := strings.TrimPrefix(strings.SplitN(timestampLine, "</p>", 2)[0], "Generated at ")
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if _, err := time.Parse(time.RFC3339, timestampStr); err != nil {
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t.Errorf("generation timestamp is not valid RFC3339: %q (err: %v)", timestampStr, err)
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}
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}
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// TestHTMLWriter_NoRowDuplication verifies that calling Render twice on the
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// same writer produces documents with the same number of <tr> rows, just
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// like pretty.PrettyPrinter's no-duplication guarantee.
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func TestHTMLWriter_NoRowDuplication(t *testing.T) {
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loc, err := writing.NewLocalizer("en")
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if err != nil {
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t.Fatalf("create localizer: %v", err)
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}
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var buf bytes.Buffer
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pp := pretty.NewPrettyPrinter(&buf, loc)
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hw := htmlwriter.NewHTMLWriter(&buf, pp, "Tax report", "en")
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aw := buildTestAggregator(t)
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if err := hw.Render(aw); err != nil {
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t.Fatalf("first Render returned an error: %v", err)
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}
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first := buf.String()
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buf.Reset()
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if err := hw.Render(aw); err != nil {
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t.Fatalf("second Render returned an error: %v", err)
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}
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second := buf.String()
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firstRows := strings.Count(first, "<tr")
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secondRows := strings.Count(second, "<tr")
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if firstRows == 0 {
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t.Fatalf("expected at least one <tr> row in the first render; got:\n%s", first)
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}
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if firstRows != secondRows {
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t.Errorf("expected second Render to produce the same number of <tr> rows as the first (no duplication)\nfirst rows=%d, second rows=%d\nFirst:\n%s\nSecond:\n%s",
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firstRows, secondRows, first, second)
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}
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}
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func TestHTMLWriter_LangAttribute(t *testing.T) {
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loc, err := writing.NewLocalizer("pt")
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if err != nil {
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t.Fatalf("create localizer: %v", err)
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}
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var buf bytes.Buffer
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pp := pretty.NewPrettyPrinter(&buf, loc)
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hw := htmlwriter.NewHTMLWriter(&buf, pp, "Relatório fiscal", "pt")
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if err := hw.Render(buildTestAggregator(t)); err != nil {
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t.Fatalf("Render returned an error: %v", err)
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}
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got := buf.String()
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if !strings.Contains(got, `<html lang="pt">`) {
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t.Errorf("expected <html lang=\"pt\"> attribute; got:\n%s", got)
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}
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if !strings.Contains(got, `<h1>Relatório fiscal</h1>`) {
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t.Errorf("expected Portuguese title in <h1>; got:\n%s", got)
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}
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}
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