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codestream_rune_test.go
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codestream_rune_test.go
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package joeson
import (
"fmt"
"regexp"
"strings"
"testing"
)
func eq_int(t *testing.T, a int, b int) {
t.Helper()
if a != b {
t.Errorf("assert %d == %d", a, b)
}
}
func eq_str(t *testing.T, a string, b string) {
t.Helper()
if a != b {
t.Errorf("assertion failed: \"%s\" == \"%s\"", a, b)
}
}
func TestRuneStreamState(t *testing.T) {
cs := NewRuneStream(`line 0
line 1
line 2 -- rest of line 2
line 3
line 4`)
eq_int(t, cs.Line(), 0)
eq_int(t, cs.Col(), 0)
line := cs.GetUntil("\n")
eq_str(t, line, "line 0\n")
eq_int(t, cs.Line(), 1)
eq_int(t, cs.Col(), 0)
line = cs.GetUntil("\n")
eq_str(t, line, "line 1\n")
eq_int(t, cs.Line(), 2)
eq_int(t, cs.Col(), 0)
part := cs.GetUntil(" -- ")
eq_str(t, part, "line 2 -- ")
eq_int(t, cs.Line(), 2)
eq_int(t, cs.Col(), 10)
eq_str(t, cs.PeekRunes(4), "rest")
// TODO uncomment and fix these 2, behavior changed as of August 07, 2023
// eq_str(t, cs.PeekLines(0), "rest of line 2")
// eq_str(t, cs.PeekLines(1), "rest of line 2\nline 3")
}
func TestRuneStreamRegexp(t *testing.T) {
cs := NewRuneStream("A EXPRESSION|B")
cs.SetPos(2)
if re, err := regexp.CompilePOSIX("([a-zA-Z\\._][a-zA-Z\\._0-9]*)"); err != nil {
t.Fatalf("regexp failed to compile")
} else {
didMatch, m := cs.MatchRegexp(*re)
if !didMatch {
t.Fatalf("expected regexp to match")
} else if m != "EXPRESSION" {
t.Fail()
}
}
}
func TestRuneStreamPosToLine(t *testing.T) {
source := `
// RuneStream is a very simple code holder, cursor, matcher.
type RuneStream struct {
text string
pos int // "Hello, 世界, X" <- Pos of o is 4, Pos of 界 is 10
lineStarts []int
}
`
code := NewRuneStream(source)
index := strings.Index(code.Code(), "text")
line := code.PosToLine(index)
if line != 3 {
t.Errorf(fmt.Sprintf("Invalid line found %d, expected 3", line))
}
col := code.PosToCol(index)
if col != 2 {
t.Errorf(fmt.Sprintf("Invalid col found %d, expected 2", col))
}
}
func TestRuneStreamPeekRunes(t *testing.T) {
abc := NewRuneStream("abc一二三αβγ")
abc.MatchString("abc一")
if abc.Pos() != 6 { // should be positionned at '二'
t.Errorf(fmt.Sprintf("invalid pos: %d", abc.Pos()))
}
eq_str(t, abc.PeekRunes(-1), "一")
eq_str(t, abc.PeekRunes(-2), "c一")
eq_str(t, abc.PeekRunes(-3), "bc一")
eq_str(t, abc.PeekRunes(-4), "abc一")
eq_str(t, abc.PeekRunes(-10), "abc一")
eq_str(t, abc.PeekRunes(0), "")
if abc.Pos() != 6 { // should not have moved
t.Errorf(fmt.Sprintf("invalid pos: %d", abc.Pos()))
}
eq_str(t, abc.PeekRunes(1), "二")
eq_str(t, abc.PeekRunes(2), "二三")
eq_str(t, abc.PeekRunes(3), "二三α")
eq_str(t, abc.PeekRunes(4), "二三αβ")
eq_str(t, abc.PeekRunes(5), "二三αβγ")
eq_str(t, abc.PeekRunes(10), "二三αβγ")
if abc.Pos() != 6 { // should not have moved
t.Errorf(fmt.Sprintf("invalid pos: %d", abc.Pos()))
}
}
func TestRuneStreamPeekLines(t *testing.T) {
s := "rose are blue\nblue are violet\nviolet are pi/2"
code := NewRuneStream(s)
index := strings.Index(code.Code(), "blue are violet")
code.SetPos(index)
{
assertPanics(t, func() { code.SetPos(-1) })
assertPanics(t, func() { code.SetPos(9999999) })
}
{
peeked := code.PeekLines(-1, 1)
if peeked != s {
t.Errorf("expected %q, got %q\n", s, peeked)
}
}
{
peeked := code.PeekLines(0, 1)
expected := "blue are violet\nviolet are pi/2"
if peeked != expected {
t.Errorf("expected %q, got %q\n", expected, peeked)
}
}
{
peeked := code.PeekLines(-1, 0)
expected := "rose are blue\nblue are violet"
if peeked != expected {
t.Errorf("expected %q, got %q\n", expected, peeked)
}
}
{
peeked := code.PeekLines(-99, 0)
expected := "rose are blue\nblue are violet"
if peeked != expected {
t.Errorf("expected %q, got %q\n", expected, peeked)
}
}
{
peeked := code.PeekLines(99, 9, 1, 0)
expected := "blue are violet\nviolet are pi/2"
if peeked != expected {
t.Errorf("expected %q, got %q\n", expected, peeked)
}
}
}
func TestRuneStreamUnicode(t *testing.T) {
{
abc := NewRuneStream("abc")
s := abc.GetUntil("a")
if s != "a" {
t.Errorf("should have obtained \"a\", not %q", s)
}
}
{
abc := NewRuneStream("αβγ")
s := abc.GetUntil("α")
if s != "α" {
t.Errorf("should have obtained \"α\", not %q", s)
}
}
{
abc := NewRuneStream("αβγ")
abc.SetPos(0)
ok, m := abc.MatchString("α")
if !ok {
t.Errorf("should have matched")
} else if m != "α" {
t.Errorf("should have matched α")
}
}
{
abc := NewRuneStream("abc")
abc.SetPos(1)
ok, m := abc.MatchString("b")
if !ok {
t.Errorf("should have matched")
} else if m != "b" {
t.Errorf("should have obtained \"b\", not %q", m)
}
}
{
abc := NewRuneStream("αβγ")
abc.SetPos(2) // note: not meant to be used like that!
ok, m := abc.MatchString("β")
if !ok {
t.Errorf("should have matched")
} else if m != "β" {
t.Errorf("should have matched β")
}
}
{
abc := NewRuneStream("αβγ")
abc.SetPos(4) // note: not meant to be used like that!
fmt.Printf("% x\n", abc.Code())
ok, m := abc.MatchString("γ")
if !ok {
t.Errorf("should have matched")
} else if m != "γ" {
t.Errorf("should have matched γ")
}
}
{
abc := NewRuneStream("αβγ")
abc.SetPos(0) // note: not meant to be used like that!
fmt.Printf("% x\n", abc.Code())
ok, c := abc.MatchRune(func(rune rune) bool { return 'γ' == rune })
if ok {
t.Errorf("should NOT have matched")
}
ok, c = abc.MatchRune(func(rune rune) bool { return 'α' == rune })
if !ok {
t.Errorf("should have matched")
} else if c != 'α' {
t.Errorf("should have matched α, got %q", c)
}
if abc.Pos() != 2 {
t.Errorf("Pos should have been updated")
}
ok, c = abc.MatchRune(func(rune rune) bool { return 'γ' == rune })
if ok {
t.Errorf("should NOT have matched")
}
ok, c = abc.MatchRune(func(rune rune) bool { return 'β' == rune })
if !ok {
t.Errorf("should have matched")
} else if c != 'β' {
t.Errorf("should have matched β")
}
if abc.Pos() != 4 {
t.Errorf("Pos should have been updated")
}
ok, c = abc.MatchRune(func(rune rune) bool { return 'γ' == rune })
if !ok {
t.Errorf("should have matched")
} else if c != 'γ' {
t.Errorf("should have matched γ")
}
if abc.Pos() != 6 {
t.Errorf("Pos should have been updated")
}
// We are now at the end of the text...
// it MUST not match
if ok, _ = abc.MatchRune(func(rune rune) bool { return true }); ok {
t.Errorf("MatchRune must never match at EOF")
}
}
}