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package css_lexer
import (
"strings"
"testing"
"github.com/evanw/esbuild/internal/logger"
"github.com/evanw/esbuild/internal/test"
)
func lexToken(contents string) (T, string) {
log := logger.NewDeferLog(logger.DeferLogNoVerboseOrDebug, nil)
result := Tokenize(log, test.SourceForTest(contents), Options{})
if len(result.Tokens) > 0 {
t := result.Tokens[0]
return t.Kind, t.DecodedText(contents)
}
return TEndOfFile, ""
}
func lexerError(contents string) string {
log := logger.NewDeferLog(logger.DeferLogNoVerboseOrDebug, nil)
Tokenize(log, test.SourceForTest(contents), Options{})
var text strings.Builder
for _, msg := range log.Done() {
text.WriteString(msg.String(logger.OutputOptions{}, logger.TerminalInfo{}))
}
return text.String()
}
func TestTokens(t *testing.T) {
expected := []struct {
contents string
text string
token T
}{
{"", "end of file", TEndOfFile},
{"@media", "@-keyword", TAtKeyword},
{"url(x y", "bad URL token", TBadURL},
{"-->", "\"-->\"", TCDC},
{"<!--", "\"<!--\"", TCDO},
{"}", "\"}\"", TCloseBrace},
{"]", "\"]\"", TCloseBracket},
{")", "\")\"", TCloseParen},
{":", "\":\"", TColon},
{",", "\",\"", TComma},
{"?", "delimiter", TDelim},
{"&", "\"&\"", TDelimAmpersand},
{"*", "\"*\"", TDelimAsterisk},
{"|", "\"|\"", TDelimBar},
{"^", "\"^\"", TDelimCaret},
{"$", "\"$\"", TDelimDollar},
{".", "\".\"", TDelimDot},
{"=", "\"=\"", TDelimEquals},
{"!", "\"!\"", TDelimExclamation},
{">", "\">\"", TDelimGreaterThan},
{"+", "\"+\"", TDelimPlus},
{"/", "\"/\"", TDelimSlash},
{"~", "\"~\"", TDelimTilde},
{"1px", "dimension", TDimension},
{"max(", "function token", TFunction},
{"#name", "hash token", THash},
{"name", "identifier", TIdent},
{"123", "number", TNumber},
{"{", "\"{\"", TOpenBrace},
{"[", "\"[\"", TOpenBracket},
{"(", "\"(\"", TOpenParen},
{"50%", "percentage", TPercentage},
{";", "\";\"", TSemicolon},
{"'abc'", "string token", TString},
{"url(test)", "URL token", TURL},
{" ", "whitespace", TWhitespace},
}
for _, it := range expected {
contents := it.contents
token := it.token
t.Run(contents, func(t *testing.T) {
kind, _ := lexToken(contents)
test.AssertEqual(t, kind, token)
})
}
}
func TestStringParsing(t *testing.T) {
contentsOfStringToken := func(contents string) string {
t.Helper()
kind, text := lexToken(contents)
test.AssertEqual(t, kind, TString)
return text
}
test.AssertEqual(t, contentsOfStringToken("\"foo\""), "foo")
test.AssertEqual(t, contentsOfStringToken("\"f\\oo\""), "foo")
test.AssertEqual(t, contentsOfStringToken("\"f\\\"o\""), "f\"o")
test.AssertEqual(t, contentsOfStringToken("\"f\\\\o\""), "f\\o")
test.AssertEqual(t, contentsOfStringToken("\"f\\\no\""), "fo")
test.AssertEqual(t, contentsOfStringToken("\"f\\\ro\""), "fo")
test.AssertEqual(t, contentsOfStringToken("\"f\\\r\no\""), "fo")
test.AssertEqual(t, contentsOfStringToken("\"f\\\fo\""), "fo")
test.AssertEqual(t, contentsOfStringToken("\"f\\6fo\""), "foo")
test.AssertEqual(t, contentsOfStringToken("\"f\\6f o\""), "foo")
test.AssertEqual(t, contentsOfStringToken("\"f\\6f o\""), "fo o")
test.AssertEqual(t, contentsOfStringToken("\"f\\fffffffo\""), "f\uFFFDfo")
test.AssertEqual(t, contentsOfStringToken("\"f\\10abcdeo\""), "f\U0010ABCDeo")
}
func TestURLParsing(t *testing.T) {
contentsOfURLToken := func(expected T, contents string) string {
t.Helper()
kind, text := lexToken(contents)
test.AssertEqual(t, kind, expected)
return text
}
test.AssertEqual(t, contentsOfURLToken(TURL, "url(foo)"), "foo")
test.AssertEqual(t, contentsOfURLToken(TURL, "url( foo\t\t)"), "foo")
test.AssertEqual(t, contentsOfURLToken(TURL, "url(f\\oo)"), "foo")
test.AssertEqual(t, contentsOfURLToken(TURL, "url(f\\\"o)"), "f\"o")
test.AssertEqual(t, contentsOfURLToken(TURL, "url(f\\'o)"), "f'o")
test.AssertEqual(t, contentsOfURLToken(TURL, "url(f\\)o)"), "f)o")
test.AssertEqual(t, contentsOfURLToken(TURL, "url(f\\6fo)"), "foo")
test.AssertEqual(t, contentsOfURLToken(TURL, "url(f\\6f o)"), "foo")
test.AssertEqual(t, contentsOfURLToken(TBadURL, "url(f\\6f o)"), "url(f\\6f o)")
}
func TestComment(t *testing.T) {
test.AssertEqualWithDiff(t, lexerError("/*"), "<stdin>: ERROR: Expected \"*/\" to terminate multi-line comment\n<stdin>: NOTE: The multi-line comment starts here:\n")
test.AssertEqualWithDiff(t, lexerError("/*/"), "<stdin>: ERROR: Expected \"*/\" to terminate multi-line comment\n<stdin>: NOTE: The multi-line comment starts here:\n")
test.AssertEqualWithDiff(t, lexerError("/**/"), "")
test.AssertEqualWithDiff(t, lexerError("//"), "<stdin>: WARNING: Comments in CSS use \"/* ... */\" instead of \"//\"\n")
}
func TestString(t *testing.T) {
test.AssertEqualWithDiff(t, lexerError("'"), "<stdin>: WARNING: Unterminated string token\n")
test.AssertEqualWithDiff(t, lexerError("\""), "<stdin>: WARNING: Unterminated string token\n")
test.AssertEqualWithDiff(t, lexerError("'\\'"), "<stdin>: WARNING: Unterminated string token\n")
test.AssertEqualWithDiff(t, lexerError("\"\\\""), "<stdin>: WARNING: Unterminated string token\n")
test.AssertEqualWithDiff(t, lexerError("''"), "")
test.AssertEqualWithDiff(t, lexerError("\"\""), "")
}
func TestBOM(t *testing.T) {
// A byte order mark should not be parsed as an identifier
kind, _ := lexToken("\uFEFF.")
test.AssertEqual(t, kind, TDelimDot)
}
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