Migrate away from templ and towards html/template

2 files changed, 530 insertions, 0 deletions

diff --git a/src/mintage/parser.go b/src/mintage/parser.go
new file mode 100644
index 0000000..364b6e8
--- /dev/null
+++ b/src/mintage/parser.go
@@ -0,0 +1,297 @@
+package mintage
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type SyntaxError struct {
+	expected, got string
+	file          string
+	linenr        int
+}
+
+func (e SyntaxError) Error() string {
+	return fmt.Sprintf("%s:%d: syntax error: expected %s but got %s",
+		e.file, e.linenr, e.expected, e.got)
+}
+
+type Data struct {
+	Standard      []SRow
+	Commemorative []CRow
+}
+
+type SRow struct {
+	Year     int
+	Mintmark string
+	Mintages [typeCount][denoms]int
+}
+
+type CRow struct {
+	Year     int
+	Mintmark string
+	Name     string
+	Mintage  [typeCount]int
+}
+
+const (
+	TypeCirc = iota
+	TypeNIFC
+	TypeProof
+	typeCount
+)
+
+const (
+	Unknown = -iota - 1
+	Invalid
+)
+
+const (
+	denoms = 8
+	ws     = " \t"
+)
+
+func Parse(r io.Reader, file string) (Data, error) {
+	yearsSince := time.Now().Year() - 1999 + 1
+	data := Data{
+		Standard:      make([]SRow, 0, yearsSince),
+		Commemorative: make([]CRow, 0, yearsSince),
+	}
+
+	scanner := bufio.NewScanner(r)
+	for linenr := 1; scanner.Scan(); linenr++ {
+		line := strings.Trim(scanner.Text(), ws)
+		if isBlankOrComment(line) {
+			continue
+		}
+
+		if len(line) < 4 || !isNumeric(line[:4], false) {
+			return Data{}, SyntaxError{
+				expected: "4-digit year",
+				got:      line,
+				linenr:   linenr,
+				file:     file,
+			}
+		}
+
+		var (
+			commem   bool
+			mintmark string
+		)
+		year, _ := strconv.Atoi(line[:4])
+		line = line[4:]
+
+		if len(line) != 0 {
+			if strings.ContainsRune(ws, rune(line[0])) {
+				commem = true
+				goto out
+			}
+			if line[0] != '-' {
+				return Data{}, SyntaxError{
+					expected: "end-of-line or mintmark",
+					got:      line,
+					linenr:   linenr,
+					file:     file,
+				}
+			}
+
+			if line = line[1:]; len(line) == 0 {
+				return Data{}, SyntaxError{
+					expected: "mintmark",
+					got:      "end-of-line",
+					linenr:   linenr,
+					file:     file,
+				}
+			}
+
+			switch i := strings.IndexAny(line, ws); i {
+			case 0:
+				return Data{}, SyntaxError{
+					expected: "mintmark",
+					got:      "whitespace",
+					linenr:   linenr,
+					file:     file,
+				}
+			case -1:
+				mintmark = line
+			default:
+				mintmark, line = line[:i], line[i:]
+				commem = true
+			}
+		}
+	out:
+
+		if !commem {
+			row := SRow{
+				Year:     year,
+				Mintmark: mintmark,
+			}
+			for i := range row.Mintages {
+				line = ""
+				for isBlankOrComment(line) {
+					if !scanner.Scan() {
+						return Data{}, SyntaxError{
+							expected: "mintage row",
+							got:      "end-of-file",
+							linenr:   linenr,
+							file:     file,
+						}
+					}
+					line = strings.Trim(scanner.Text(), ws)
+					linenr++
+				}
+
+				tokens := strings.FieldsFunc(line, func(r rune) bool {
+					return strings.ContainsRune(ws, r)
+				})
+				if tokcnt := len(tokens); tokcnt != denoms {
+					word := "entries"
+					if tokcnt == 1 {
+						word = "entry"
+					}
+					return Data{}, SyntaxError{
+						expected: fmt.Sprintf("%d mintage entries", denoms),
+						got:      fmt.Sprintf("%d %s", tokcnt, word),
+						linenr:   linenr,
+						file:     file,
+					}
+				}
+
+				for j, tok := range tokens {
+					if tok != "?" && !isNumeric(tok, true) {
+						return Data{}, SyntaxError{
+							expected: "numeric mintage figure or ‘?’",
+							got:      tok,
+							linenr:   linenr,
+							file:     file,
+						}
+					}
+
+					if tok == "?" {
+						row.Mintages[i][j] = Unknown
+					} else {
+						row.Mintages[i][j] = atoiWithDots(tok)
+					}
+				}
+			}
+
+			data.Standard = append(data.Standard, row)
+		} else {
+			row := CRow{
+				Year:     year,
+				Mintmark: mintmark,
+			}
+			line = strings.TrimLeft(line, ws)
+			if line[0] != '"' {
+				return Data{}, SyntaxError{
+					expected: "string",
+					got:      line,
+					linenr:   linenr,
+					file:     file,
+				}
+			}
+
+			line = line[1:]
+			switch i := strings.IndexByte(line, '"'); i {
+			case -1:
+				return Data{}, SyntaxError{
+					expected: "closing quote",
+					got:      "end-of-line",
+					linenr:   linenr,
+					file:     file,
+				}
+			case 0:
+				return Data{}, SyntaxError{
+					expected: "commemorated event",
+					got:      "empty string",
+					linenr:   linenr,
+					file:     file,
+				}
+			default:
+				row.Name, line = line[:i], line[i+1:]
+			}
+
+			if len(line) != 0 {
+				return Data{}, SyntaxError{
+					expected: "end-of-line",
+					got:      line,
+					linenr:   linenr,
+					file:     file,
+				}
+			}
+
+			for isBlankOrComment(line) {
+				if !scanner.Scan() {
+					return Data{}, SyntaxError{
+						expected: "mintage row",
+						got:      "end-of-file",
+						linenr:   linenr,
+						file:     file,
+					}
+				}
+				line = strings.Trim(scanner.Text(), ws)
+				linenr++
+			}
+
+			tokens := strings.FieldsFunc(line, func(r rune) bool {
+				return strings.ContainsRune(ws, r)
+			})
+			if tokcnt := len(tokens); tokcnt != typeCount {
+				word := "entries"
+				if tokcnt == 1 {
+					word = "entry"
+				}
+				return Data{}, SyntaxError{
+					expected: fmt.Sprintf("%d mintage entries", typeCount),
+					got:      fmt.Sprintf("%d %s", tokcnt, word),
+					linenr:   linenr,
+					file:     file,
+				}
+			}
+
+			for i, tok := range tokens {
+				if tok == "?" {
+					row.Mintage[i] = Unknown
+				} else {
+					row.Mintage[i] = atoiWithDots(tok)
+				}
+			}
+
+			data.Commemorative = append(data.Commemorative, row)
+		}
+	}
+
+	return data, nil
+}
+
+func isNumeric(s string, dot bool) bool {
+	for _, ch := range s {
+		switch ch {
+		case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
+		default:
+			if ch != '.' || !dot {
+				return false
+			}
+		}
+	}
+	return true
+}
+
+func atoiWithDots(s string) int {
+	n := 0
+	for _, ch := range s {
+		if ch == '.' {
+			continue
+		}
+		n = n*10 + int(ch) - '0'
+	}
+	return n
+}
+
+func isBlankOrComment(s string) bool {
+	return len(s) == 0 || s[0] == '#'
+}
diff --git a/src/mintage/parser_test.go b/src/mintage/parser_test.go
new file mode 100644
index 0000000..76e0f01
--- /dev/null
+++ b/src/mintage/parser_test.go
@@ -0,0 +1,233 @@
+package mintage
+
+import (
+	"bytes"
+	"errors"
+	"testing"
+)
+
+func TestParserComplete(t *testing.T) {
+	data, err := Parse(bytes.NewBuffer([]byte(`
+		2020
+			 1000 1001  1002 1003 1004 1005 1006 1007
+			 1100 1101  1102 1103 1104 1105 1106 1107
+			 1200 1201  1202 1203 1204 1205 1206 1207
+		2021-KNM
+			2.000    ?  2002 2003 2004 2005 2006 2007
+			2.100    ?  2102 2103 2104 2105 2106 2107
+			2.200    ?  2202 2203 2204 2205 2206 2207
+		2021-MdP
+			 3000 3001  3002 3003 3004 3005 3006 3007
+			 3100 3101  3102 3103 3104 3105 3106 3107
+			 3200 3201  3202 3203 3204 3205 3206 3207
+		2022
+			4000 4001 4.002 4003 4004 4005 4006 4007
+			4100 4101 4.102 4103 4104 4105 4106 4107
+			4200 4201 4.202 4203 4204 4205 4206 4207
+
+		2009 "10th Anniversary of Economic and Monetary Union"
+			1000 2000 3000
+		2022-⋆ "35th Anniversary of the Erasmus Programme"
+			1001    ? 3001
+	`)), "-")
+
+	if err != nil {
+		t.Fatalf(`Expected err=nil; got "%s"`, err)
+	}
+
+	for i, row := range data.Standard {
+		for k := TypeCirc; k <= TypeProof; k++ {
+			for j, col := range row.Mintages[k] {
+				n := 1000*(i+1) + 100*k + j
+				if i == 1 && j == 1 {
+					n = Unknown
+				}
+				if col != n {
+					t.Fatalf("Expected data.Standard[%d].Mintages[%d][%d]=%d; got %d",
+						i, k, j, col, n)
+				}
+			}
+		}
+	}
+
+	for i, row := range data.Commemorative {
+		for k := TypeCirc; k <= TypeProof; k++ {
+			n := 1000*(k+1) + i
+			if i == 1 && k == 1 {
+				n = Unknown
+			}
+			if row.Mintage[k] != n {
+				t.Fatalf("Expected row.Mintage[%d]=%d; got %d",
+					k, n, row.Mintage[k])
+			}
+		}
+	}
+
+	if len(data.Standard) != 4 {
+		t.Fatalf("Expected len(data.Standard)=2; got %d", len(data.Standard))
+	}
+	if len(data.Commemorative) != 2 {
+		t.Fatalf("Expected len(data.Commemorative)=2; got %d", len(data.Commemorative))
+	}
+
+	for i, x := range [...]struct {
+		year           int
+		mintmark, name string
+	}{
+		{2009, "", "10th Anniversary of Economic and Monetary Union"},
+		{2022, "⋆", "35th Anniversary of the Erasmus Programme"},
+	} {
+		if data.Commemorative[i].Year != x.year {
+			t.Fatalf("Expected data.Commemorative[%d].Year=%d; got %d",
+				i, x.year, data.Commemorative[i].Year)
+		}
+		if data.Commemorative[i].Mintmark != x.mintmark {
+			t.Fatalf(`Expected data.Commemorative[%d].Mintmark="%s"; got "%s"`,
+				i, x.mintmark, data.Commemorative[i].Mintmark)
+		}
+		if data.Commemorative[i].Name != x.name {
+			t.Fatalf(`Expected data.Commemorative[%d].Name="%s"; got "%s"`,
+				i, x.name, data.Commemorative[i].Name)
+		}
+	}
+}
+
+func TestParserMintmarks(t *testing.T) {
+	data, err := Parse(bytes.NewBuffer([]byte(`
+		2020
+			 1000 1001  1002 1003 1004 1005 1006 1007
+			 1100 1101  1102 1103 1104 1105 1106 1107
+			 1200 1201  1202 1203 1204 1205 1206 1207
+		2021-KNM
+			2.000    ?  2002 2003 2004 2005 2006 2007
+			2.100    ?  2102 2103 2104 2105 2106 2107
+			2.200    ?  2202 2203 2204 2205 2206 2207
+		2021-MdP
+			 3000 3001  3002 3003 3004 3005 3006 3007
+			 3100 3101  3102 3103 3104 3105 3106 3107
+			 3200 3201  3202 3203 3204 3205 3206 3207
+		2022
+			 4000 4001 4.002 4003 4004 4005 4006 4007
+			 4100 4101 4.102 4103 4104 4105 4106 4107
+			 4200 4201 4.202 4203 4204 4205 4206 4207
+	`)), "-")
+
+	if err != nil {
+		t.Fatalf(`Expected err=nil; got "%s"`, err)
+	}
+
+	for i, row := range data.Standard {
+		for j, col := range row.Mintages[TypeCirc] {
+			n := 1000*(i+1) + j
+			if i == 1 && j == 1 {
+				n = Unknown
+			}
+			if col != n {
+				t.Fatalf("Expected data.Standard[%d].Mintages[TypeCirc][%d]=%d; got %d",
+					i, j, col, n)
+			}
+		}
+	}
+
+	for i, y := range [...]int{2020, 2021, 2021, 2022} {
+		if data.Standard[i].Year != y {
+			t.Fatalf("Expected data.Standard[%d].Year=%d; got %d",
+				i, y, data.Standard[i].Year)
+		}
+	}
+
+	for i, m := range [...]string{"", "KNM", "MdP", ""} {
+		if data.Standard[i].Mintmark != m {
+			t.Fatalf(`Expected data.Standard[%d].Mintmark="%s"; got "%s"`,
+				i, m, data.Standard[i].Mintmark)
+		}
+	}
+}
+
+func TestParserNoYear(t *testing.T) {
+	_, err := Parse(bytes.NewBuffer([]byte(`
+			1.000 1001 1002 1003 1004 1005 1006 1007
+			1.100 1101 1102 1103 1104 1105 1106 1107
+			1.200 1201 1202 1203 1204 1205 1206 1207
+		2021
+			 2000    ? 2002 2003 2004 2005 2006 2007
+			 2100    ? 2102 2103 2104 2105 2106 2107
+			 2200    ? 2202 2203 2204 2205 2206 2207
+	`)), "-")
+
+	var sErr SyntaxError
+	if !errors.As(err, &sErr) {
+		t.Fatalf("Expected err=SyntaxError; got %s", err)
+	}
+}
+
+func TestParserBadToken(t *testing.T) {
+	_, err := Parse(bytes.NewBuffer([]byte(`
+		2020
+			1.000 1001 1002 1003 1004 1005 1006 1007
+			1.100 1101 1102 1103 1104 1105 1106 1107
+			1.200 1201 1202 1203 1204 1205 1206 1207
+		2021 Naughty!
+			 2000    ? 2002 2003 2004 2005 2006 2007
+			 2100    ? 2102 2103 2104 2105 2106 2107
+			 2200    ? 2202 2203 2204 2205 2206 2207
+	`)), "-")
+
+	var sErr SyntaxError
+	if !errors.As(err, &sErr) {
+		t.Fatalf("Expected err=SyntaxError; got %s", err)
+	}
+}
+
+func TestParserShortRow(t *testing.T) {
+	_, err := Parse(bytes.NewBuffer([]byte(`
+		2020
+			1.000 1001 1002 1003 1004 1005 1006 1007
+			1.100 1101 1102 1103 1104 1105 1106 1107
+			1.200 1201 1202 1203 1204 1205 1206 1207
+		2021
+			 2000    ? 2002 2003 2004 2005 2006 2007
+			 2100    ? 2102 2103 2104 2105 2106
+			 2200    ? 2202 2203 2204 2205 2206 2207
+	`)), "-")
+
+	var sErr SyntaxError
+	if !errors.As(err, &sErr) {
+		t.Fatalf("Expected err=SyntaxError; got %s", err)
+	}
+}
+
+func TestParserLongRow(t *testing.T) {
+	_, err := Parse(bytes.NewBuffer([]byte(`
+		2020
+			1.000 1001 1002 1003 1004 1005 1006 1007
+			1.100 1101 1102 1103 1104 1105 1106 1107
+			1.200 1201 1202 1203 1204 1205 1206 1207
+		2021
+			 2000    ? 2002 2003 2004 2005 2006 2007
+			 2100    ? 2102 2103 2104 2105 2106 2107 2108
+			 2200    ? 2202 2203 2204 2205 2206 2207
+	`)), "-")
+
+	var sErr SyntaxError
+	if !errors.As(err, &sErr) {
+		t.Fatalf("Expected err=SyntaxError; got %s", err)
+	}
+}
+
+func TestParserMissingRow(t *testing.T) {
+	_, err := Parse(bytes.NewBuffer([]byte(`
+		2020
+			1.000 1001 1002 1003 1004 1005 1006 1007
+			1.100 1101 1102 1103 1104 1105 1106 1107
+			1.200 1201 1202 1203 1204 1205 1206 1207
+		2021
+			 2000    ? 2002 2003 2004 2005 2006 2007
+			 2200    ? 2202 2203 2204 2205 2206 2207
+	`)), "-")
+
+	var sErr SyntaxError
+	if !errors.As(err, &sErr) {
+		t.Fatalf("Expected err=SyntaxError; got %s", err)
+	}
+}