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|
package parser
import (
"bufio"
"io"
"strings"
"testing"
)
func TestPeekRune(t *testing.T) {
s := "Ta’ Ħaġrat"
reader := reader{r: bufio.NewReader(strings.NewReader(s))}
for _, r := range s {
r1, err := reader.peekRune()
if err != nil && !(err == io.EOF && r == 't') {
t.Fatalf("reader.peekRune() failed with ‘%T’ at rune ‘%c’", err, r)
}
r2, _ := reader.readRune()
if r1 != r2 {
t.Fatalf("reader.peekRune() peaked ‘%c’ but the next read rune was ‘%c’", r1, r2)
}
}
}
func TestUnreadRune(t *testing.T) {
s := "Ta’ Ħaġrat"
reader := reader{r: bufio.NewReader(strings.NewReader(s))}
for range s {
r1, _ := reader.readRune()
if err := reader.unreadRune(); err != nil {
t.Fatalf("reader.unreadRune() failed with ‘%T’ when unreading rune ‘%c’", err, r1)
}
r2, _ := reader.readRune()
if r1 != r2 {
t.Fatalf("reader.readRune() returned ‘%c’ after unreading ‘%c’", r2, r1)
}
}
}
func TestUnreadRunePosTracking(t *testing.T) {
s := "Ta’ Ħaġrat\nIJsselmeer"
reader := reader{r: bufio.NewReader(strings.NewReader(s))}
for i := range []rune(s) {
r, _ := reader.readRune()
if err := reader.unreadRune(); err != nil {
t.Fatalf("reader.unreadRune() failed with ‘%T’ when unreading rune ‘%c’", err, r)
}
// Ensure we tracked the row correctly
switch {
case i < 11 && reader.pos.row != 0:
t.Fatalf("Expected reader to be on row 0 after unreading rune ‘%c’ but got row %d", r, reader.pos.row)
case i >= 11 && reader.pos.row != 1:
t.Fatalf("Expected reader to be on row 1 after unreading rune ‘%c’ but got row %d", r, reader.pos.row)
}
// Ensure we tracked the column correctly
switch {
case i < 11 && reader.pos.col != uint(i):
t.Fatalf("Expected reader to be on col %d after unreading rune ‘%c’ but got col %d", i, r, reader.pos.col)
case i == 11 && reader.pos.col != 0:
t.Fatalf("Expected reader to be on col 0 after unreading rune ‘\\n’ but got col %d", reader.pos.col)
case i > 11 && reader.pos.col != uint(i)-11:
t.Fatalf("Expected reader to be on col %d after unreading rune ‘%c’ but got col %d", i-10, r, reader.pos.col)
}
reader.readRune()
}
}
func TestReadRune(t *testing.T) {
s := "Ta’ Ħaġrat"
reader := reader{r: bufio.NewReader(strings.NewReader(s))}
for _, r1 := range s {
r2, err := reader.readRune()
if err != nil {
t.Fatalf("reader.readRune() failed with ‘%T’", err)
}
if r1 != r2 {
t.Fatalf("reader.readRune() read ‘%c’ but ‘%c’ was expected", r1, r2)
}
}
_, err := reader.readRune()
switch {
case err == nil:
t.Fatal("reader.readRune() expected to fail but didn’t")
case err != io.EOF:
t.Fatalf("reader.readRune() expected to fail with io.EOF but got ‘%T’", err)
}
}
func TestReadRunePosTracking(t *testing.T) {
s := "Ta’ Ħaġrat\nIJsselmeer"
line1 := true
reader := reader{r: bufio.NewReader(strings.NewReader(s))}
for i := range []rune(s) {
// Track the line we’re on
r, _ := reader.readRune()
if r == '\n' {
line1 = false
}
// Ensure we tracked the row correctly
switch {
case line1 && reader.pos.row != 0:
t.Fatalf("Expected reader to be on row 0 when reading rune ‘%c’ but got row %d", r, reader.pos.row)
case !line1 && reader.pos.row != 1:
t.Fatalf("Expected reader to be on row 1 when reading rune ‘%c’ but got row %d", r, reader.pos.row)
}
// Ensure we tracked the column correctly
switch {
case i < 10 && reader.pos.col != uint(i)+1:
t.Fatalf("Expected reader to be on col %d when reading rune ‘%c’ but got col %d", i, r, reader.pos.col)
case i == 10 && reader.pos.col != 0:
t.Fatalf("Expected reader to be on col 0 when reading rune ‘\\n’ but got col %d", reader.pos.col)
case i > 10 && reader.pos.col != uint(i)-10:
t.Fatalf("Expected reader to be on col %d when reading rune ‘%c’ but got col %d", i-10, r, reader.pos.col)
}
}
}
func TestReadNonSpaceRune(t *testing.T) {
s := "Ta’ Ħaġrat \t\n IJsselmeer"
reader := reader{r: bufio.NewReader(strings.NewReader(s))}
readUntil := func(target rune) {
for {
if r, _ := reader.readRune(); r == target {
break
}
}
}
assertNext := func(target rune) {
if r, err := reader.readNonSpaceRune(); err != nil {
t.Fatalf("reader.readNonSpaceRune() failed with ‘%T’", err)
} else if r != target {
t.Fatalf("reader.readNonSpaceRune() expected to return ‘%c’ but returned ‘%c’", target, r)
}
}
readUntil('’')
assertNext('Ħ')
readUntil('t')
assertNext('IJ')
}
func TestSkipSpaces(t *testing.T) {
s := "Ta’ Ħaġrat \t\n IJsselmeer"
reader := reader{r: bufio.NewReader(strings.NewReader(s))}
readUntil := func(target rune) {
for {
if r, _ := reader.readRune(); r == target {
break
}
}
}
assertNext := func(target rune) {
if err := reader.skipSpaces(); err != nil {
t.Fatalf("reader.skipSpaces() failed with ‘%T’", err)
}
if r, _ := reader.readRune(); r != target {
t.Fatalf("reader.readRune() expected to return ‘%c’ but returned ‘%c’", target, r)
}
}
readUntil('’')
assertNext('Ħ')
readUntil('t')
assertNext('IJ')
}
|
