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scanner.go
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package scanner
import (
"fmt"
"iter"
"strconv"
"strings"
"unicode"
"unicode/utf8"
"github.com/microsoft/typescript-go/internal/ast"
"github.com/microsoft/typescript-go/internal/compiler/diagnostics"
"github.com/microsoft/typescript-go/internal/core"
"github.com/microsoft/typescript-go/internal/jsnum"
"github.com/microsoft/typescript-go/internal/stringutil"
)
type EscapeSequenceScanningFlags int32
const (
EscapeSequenceScanningFlagsString EscapeSequenceScanningFlags = 1 << 0
EscapeSequenceScanningFlagsReportErrors EscapeSequenceScanningFlags = 1 << 1
EscapeSequenceScanningFlagsRegularExpression EscapeSequenceScanningFlags = 1 << 2
EscapeSequenceScanningFlagsAnnexB EscapeSequenceScanningFlags = 1 << 3
EscapeSequenceScanningFlagsAnyUnicodeMode EscapeSequenceScanningFlags = 1 << 4
EscapeSequenceScanningFlagsAtomEscape EscapeSequenceScanningFlags = 1 << 5
EscapeSequenceScanningFlagsReportInvalidEscapeErrors EscapeSequenceScanningFlags = EscapeSequenceScanningFlagsRegularExpression | EscapeSequenceScanningFlagsReportErrors
EscapeSequenceScanningFlagsAllowExtendedUnicodeEscape EscapeSequenceScanningFlags = EscapeSequenceScanningFlagsString | EscapeSequenceScanningFlagsAnyUnicodeMode
)
type ErrorCallback func(diagnostic *diagnostics.Message, start, length int, args ...any)
var textToKeyword = map[string]ast.Kind{
"abstract": ast.KindAbstractKeyword,
"accessor": ast.KindAccessorKeyword,
"any": ast.KindAnyKeyword,
"as": ast.KindAsKeyword,
"asserts": ast.KindAssertsKeyword,
"assert": ast.KindAssertKeyword,
"bigint": ast.KindBigIntKeyword,
"boolean": ast.KindBooleanKeyword,
"break": ast.KindBreakKeyword,
"case": ast.KindCaseKeyword,
"catch": ast.KindCatchKeyword,
"class": ast.KindClassKeyword,
"continue": ast.KindContinueKeyword,
"const": ast.KindConstKeyword,
"constructor": ast.KindConstructorKeyword,
"debugger": ast.KindDebuggerKeyword,
"declare": ast.KindDeclareKeyword,
"default": ast.KindDefaultKeyword,
"delete": ast.KindDeleteKeyword,
"do": ast.KindDoKeyword,
"else": ast.KindElseKeyword,
"enum": ast.KindEnumKeyword,
"export": ast.KindExportKeyword,
"extends": ast.KindExtendsKeyword,
"false": ast.KindFalseKeyword,
"finally": ast.KindFinallyKeyword,
"for": ast.KindForKeyword,
"from": ast.KindFromKeyword,
"function": ast.KindFunctionKeyword,
"get": ast.KindGetKeyword,
"if": ast.KindIfKeyword,
"immediate": ast.KindImmediateKeyword,
"implements": ast.KindImplementsKeyword,
"import": ast.KindImportKeyword,
"in": ast.KindInKeyword,
"infer": ast.KindInferKeyword,
"instanceof": ast.KindInstanceOfKeyword,
"interface": ast.KindInterfaceKeyword,
"intrinsic": ast.KindIntrinsicKeyword,
"is": ast.KindIsKeyword,
"keyof": ast.KindKeyOfKeyword,
"let": ast.KindLetKeyword,
"module": ast.KindModuleKeyword,
"namespace": ast.KindNamespaceKeyword,
"never": ast.KindNeverKeyword,
"new": ast.KindNewKeyword,
"null": ast.KindNullKeyword,
"number": ast.KindNumberKeyword,
"object": ast.KindObjectKeyword,
"package": ast.KindPackageKeyword,
"private": ast.KindPrivateKeyword,
"protected": ast.KindProtectedKeyword,
"public": ast.KindPublicKeyword,
"override": ast.KindOverrideKeyword,
"out": ast.KindOutKeyword,
"readonly": ast.KindReadonlyKeyword,
"require": ast.KindRequireKeyword,
"global": ast.KindGlobalKeyword,
"return": ast.KindReturnKeyword,
"satisfies": ast.KindSatisfiesKeyword,
"set": ast.KindSetKeyword,
"static": ast.KindStaticKeyword,
"string": ast.KindStringKeyword,
"super": ast.KindSuperKeyword,
"switch": ast.KindSwitchKeyword,
"symbol": ast.KindSymbolKeyword,
"this": ast.KindThisKeyword,
"throw": ast.KindThrowKeyword,
"true": ast.KindTrueKeyword,
"try": ast.KindTryKeyword,
"type": ast.KindTypeKeyword,
"typeof": ast.KindTypeOfKeyword,
"undefined": ast.KindUndefinedKeyword,
"unique": ast.KindUniqueKeyword,
"unknown": ast.KindUnknownKeyword,
"using": ast.KindUsingKeyword,
"var": ast.KindVarKeyword,
"void": ast.KindVoidKeyword,
"while": ast.KindWhileKeyword,
"with": ast.KindWithKeyword,
"yield": ast.KindYieldKeyword,
"async": ast.KindAsyncKeyword,
"await": ast.KindAwaitKeyword,
"of": ast.KindOfKeyword,
}
var textToToken = map[string]ast.Kind{
"{": ast.KindOpenBraceToken,
"}": ast.KindCloseBraceToken,
"(": ast.KindOpenParenToken,
")": ast.KindCloseParenToken,
"[": ast.KindOpenBracketToken,
"]": ast.KindCloseBracketToken,
".": ast.KindDotToken,
"...": ast.KindDotDotDotToken,
";": ast.KindSemicolonToken,
",": ast.KindCommaToken,
"<": ast.KindLessThanToken,
">": ast.KindGreaterThanToken,
"<=": ast.KindLessThanEqualsToken,
">=": ast.KindGreaterThanEqualsToken,
"==": ast.KindEqualsEqualsToken,
"!=": ast.KindExclamationEqualsToken,
"===": ast.KindEqualsEqualsEqualsToken,
"!==": ast.KindExclamationEqualsEqualsToken,
"=>": ast.KindEqualsGreaterThanToken,
"+": ast.KindPlusToken,
"-": ast.KindMinusToken,
"**": ast.KindAsteriskAsteriskToken,
"*": ast.KindAsteriskToken,
"/": ast.KindSlashToken,
"%": ast.KindPercentToken,
"++": ast.KindPlusPlusToken,
"--": ast.KindMinusMinusToken,
"<<": ast.KindLessThanLessThanToken,
"</": ast.KindLessThanSlashToken,
">>": ast.KindGreaterThanGreaterThanToken,
">>>": ast.KindGreaterThanGreaterThanGreaterThanToken,
"&": ast.KindAmpersandToken,
"|": ast.KindBarToken,
"^": ast.KindCaretToken,
"!": ast.KindExclamationToken,
"~": ast.KindTildeToken,
"&&": ast.KindAmpersandAmpersandToken,
"||": ast.KindBarBarToken,
"?": ast.KindQuestionToken,
"??": ast.KindQuestionQuestionToken,
"?.": ast.KindQuestionDotToken,
":": ast.KindColonToken,
"=": ast.KindEqualsToken,
"+=": ast.KindPlusEqualsToken,
"-=": ast.KindMinusEqualsToken,
"*=": ast.KindAsteriskEqualsToken,
"**=": ast.KindAsteriskAsteriskEqualsToken,
"/=": ast.KindSlashEqualsToken,
"%=": ast.KindPercentEqualsToken,
"<<=": ast.KindLessThanLessThanEqualsToken,
">>=": ast.KindGreaterThanGreaterThanEqualsToken,
">>>=": ast.KindGreaterThanGreaterThanGreaterThanEqualsToken,
"&=": ast.KindAmpersandEqualsToken,
"|=": ast.KindBarEqualsToken,
"^=": ast.KindCaretEqualsToken,
"||=": ast.KindBarBarEqualsToken,
"&&=": ast.KindAmpersandAmpersandEqualsToken,
"??=": ast.KindQuestionQuestionEqualsToken,
"@": ast.KindAtToken,
"#": ast.KindHashToken,
"`": ast.KindBacktickToken,
}
// As per ECMAScript Language Specification 5th Edition, Section 7.6: ISyntaxToken Names and Identifiers
// IdentifierStart ::
//
// Can contain Unicode 6.2 categories:
// Uppercase letter (Lu),
// Lowercase letter (Ll),
// Titlecase letter (Lt),
// Modifier letter (Lm),
// Other letter (Lo), or
// Letter number (Nl).
//
// IdentifierPart ::
//
// Can contain IdentifierStart + Unicode 6.2 categories:
// Non-spacing mark (Mn),
// Combining spacing mark (Mc),
// Decimal number (Nd),
// Connector punctuation (Pc),
// <ZWNJ>, or
// <ZWJ>.
//
// Codepoint ranges for ES5 Identifiers are extracted from the Unicode 6.2 specification at:
// http://www.unicode.org/Public/6.2.0/ucd/UnicodeData.txt
var (
unicodeES5IdentifierStart = []rune{170, 170, 181, 181, 186, 186, 192, 214, 216, 246, 248, 705, 710, 721, 736, 740, 748, 748, 750, 750, 880, 884, 886, 887, 890, 893, 902, 902, 904, 906, 908, 908, 910, 929, 931, 1013, 1015, 1153, 1162, 1319, 1329, 1366, 1369, 1369, 1377, 1415, 1488, 1514, 1520, 1522, 1568, 1610, 1646, 1647, 1649, 1747, 1749, 1749, 1765, 1766, 1774, 1775, 1786, 1788, 1791, 1791, 1808, 1808, 1810, 1839, 1869, 1957, 1969, 1969, 1994, 2026, 2036, 2037, 2042, 2042, 2048, 2069, 2074, 2074, 2084, 2084, 2088, 2088, 2112, 2136, 2208, 2208, 2210, 2220, 2308, 2361, 2365, 2365, 2384, 2384, 2392, 2401, 2417, 2423, 2425, 2431, 2437, 2444, 2447, 2448, 2451, 2472, 2474, 2480, 2482, 2482, 2486, 2489, 2493, 2493, 2510, 2510, 2524, 2525, 2527, 2529, 2544, 2545, 2565, 2570, 2575, 2576, 2579, 2600, 2602, 2608, 2610, 2611, 2613, 2614, 2616, 2617, 2649, 2652, 2654, 2654, 2674, 2676, 2693, 2701, 2703, 2705, 2707, 2728, 2730, 2736, 2738, 2739, 2741, 2745, 2749, 2749, 2768, 2768, 2784, 2785, 2821, 2828, 2831, 2832, 2835, 2856, 2858, 2864, 2866, 2867, 2869, 2873, 2877, 2877, 2908, 2909, 2911, 2913, 2929, 2929, 2947, 2947, 2949, 2954, 2958, 2960, 2962, 2965, 2969, 2970, 2972, 2972, 2974, 2975, 2979, 2980, 2984, 2986, 2990, 3001, 3024, 3024, 3077, 3084, 3086, 3088, 3090, 3112, 3114, 3123, 3125, 3129, 3133, 3133, 3160, 3161, 3168, 3169, 3205, 3212, 3214, 3216, 3218, 3240, 3242, 3251, 3253, 3257, 3261, 3261, 3294, 3294, 3296, 3297, 3313, 3314, 3333, 3340, 3342, 3344, 3346, 3386, 3389, 3389, 3406, 3406, 3424, 3425, 3450, 3455, 3461, 3478, 3482, 3505, 3507, 3515, 3517, 3517, 3520, 3526, 3585, 3632, 3634, 3635, 3648, 3654, 3713, 3714, 3716, 3716, 3719, 3720, 3722, 3722, 3725, 3725, 3732, 3735, 3737, 3743, 3745, 3747, 3749, 3749, 3751, 3751, 3754, 3755, 3757, 3760, 3762, 3763, 3773, 3773, 3776, 3780, 3782, 3782, 3804, 3807, 3840, 3840, 3904, 3911, 3913, 3948, 3976, 3980, 4096, 4138, 4159, 4159, 4176, 4181, 4186, 4189, 4193, 4193, 4197, 4198, 4206, 4208, 4213, 4225, 4238, 4238, 4256, 4293, 4295, 4295, 4301, 4301, 4304, 4346, 4348, 4680, 4682, 4685, 4688, 4694, 4696, 4696, 4698, 4701, 4704, 4744, 4746, 4749, 4752, 4784, 4786, 4789, 4792, 4798, 4800, 4800, 4802, 4805, 4808, 4822, 4824, 4880, 4882, 4885, 4888, 4954, 4992, 5007, 5024, 5108, 5121, 5740, 5743, 5759, 5761, 5786, 5792, 5866, 5870, 5872, 5888, 5900, 5902, 5905, 5920, 5937, 5952, 5969, 5984, 5996, 5998, 6000, 6016, 6067, 6103, 6103, 6108, 6108, 6176, 6263, 6272, 6312, 6314, 6314, 6320, 6389, 6400, 6428, 6480, 6509, 6512, 6516, 6528, 6571, 6593, 6599, 6656, 6678, 6688, 6740, 6823, 6823, 6917, 6963, 6981, 6987, 7043, 7072, 7086, 7087, 7098, 7141, 7168, 7203, 7245, 7247, 7258, 7293, 7401, 7404, 7406, 7409, 7413, 7414, 7424, 7615, 7680, 7957, 7960, 7965, 7968, 8005, 8008, 8013, 8016, 8023, 8025, 8025, 8027, 8027, 8029, 8029, 8031, 8061, 8064, 8116, 8118, 8124, 8126, 8126, 8130, 8132, 8134, 8140, 8144, 8147, 8150, 8155, 8160, 8172, 8178, 8180, 8182, 8188, 8305, 8305, 8319, 8319, 8336, 8348, 8450, 8450, 8455, 8455, 8458, 8467, 8469, 8469, 8473, 8477, 8484, 8484, 8486, 8486, 8488, 8488, 8490, 8493, 8495, 8505, 8508, 8511, 8517, 8521, 8526, 8526, 8544, 8584, 11264, 11310, 11312, 11358, 11360, 11492, 11499, 11502, 11506, 11507, 11520, 11557, 11559, 11559, 11565, 11565, 11568, 11623, 11631, 11631, 11648, 11670, 11680, 11686, 11688, 11694, 11696, 11702, 11704, 11710, 11712, 11718, 11720, 11726, 11728, 11734, 11736, 11742, 11823, 11823, 12293, 12295, 12321, 12329, 12337, 12341, 12344, 12348, 12353, 12438, 12445, 12447, 12449, 12538, 12540, 12543, 12549, 12589, 12593, 12686, 12704, 12730, 12784, 12799, 13312, 19893, 19968, 40908, 40960, 42124, 42192, 42237, 42240, 42508, 42512, 42527, 42538, 42539, 42560, 42606, 42623, 42647, 42656, 42735, 42775, 42783, 42786, 42888, 42891, 42894, 42896, 42899, 42912, 42922, 43000, 43009, 43011, 43013, 43015, 43018, 43020, 43042, 43072, 43123, 43138, 43187, 43250, 43255, 43259, 43259, 43274, 43301, 43312, 43334, 43360, 43388, 43396, 43442, 43471, 43471, 43520, 43560, 43584, 43586, 43588, 43595, 43616, 43638, 43642, 43642, 43648, 43695, 43697, 43697, 43701, 43702, 43705, 43709, 43712, 43712, 43714, 43714, 43739, 43741, 43744, 43754, 43762, 43764, 43777, 43782, 43785, 43790, 43793, 43798, 43808, 43814, 43816, 43822, 43968, 44002, 44032, 55203, 55216, 55238, 55243, 55291, 63744, 64109, 64112, 64217, 64256, 64262, 64275, 64279, 64285, 64285, 64287, 64296, 64298, 64310, 64312, 64316, 64318, 64318, 64320, 64321, 64323, 64324, 64326, 64433, 64467, 64829, 64848, 64911, 64914, 64967, 65008, 65019, 65136, 65140, 65142, 65276, 65313, 65338, 65345, 65370, 65382, 65470, 65474, 65479, 65482, 65487, 65490, 65495, 65498, 65500}
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)
// Generated by scripts/regenerate-unicode-identifier-parts.mjs on node v22.1.0 with unicode 15.1
// based on http://www.unicode.org/reports/tr31/ and https://www.ecma-international.org/ecma-262/6.0/#sec-names-and-keywords
// unicodeESNextIdentifierStart corresponds to the ID_Start and Other_ID_Start property, and
// unicodeESNextIdentifierPart corresponds to ID_Continue, Other_ID_Continue, plus ID_Start and Other_ID_Start
var (
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unicodeESNextIdentifierPart = []rune{48, 57, 65, 90, 95, 95, 97, 122, 170, 170, 181, 181, 183, 183, 186, 186, 192, 214, 216, 246, 248, 705, 710, 721, 736, 740, 748, 748, 750, 750, 768, 884, 886, 887, 890, 893, 895, 895, 902, 906, 908, 908, 910, 929, 931, 1013, 1015, 1153, 1155, 1159, 1162, 1327, 1329, 1366, 1369, 1369, 1376, 1416, 1425, 1469, 1471, 1471, 1473, 1474, 1476, 1477, 1479, 1479, 1488, 1514, 1519, 1522, 1552, 1562, 1568, 1641, 1646, 1747, 1749, 1756, 1759, 1768, 1770, 1788, 1791, 1791, 1808, 1866, 1869, 1969, 1984, 2037, 2042, 2042, 2045, 2045, 2048, 2093, 2112, 2139, 2144, 2154, 2160, 2183, 2185, 2190, 2200, 2273, 2275, 2403, 2406, 2415, 2417, 2435, 2437, 2444, 2447, 2448, 2451, 2472, 2474, 2480, 2482, 2482, 2486, 2489, 2492, 2500, 2503, 2504, 2507, 2510, 2519, 2519, 2524, 2525, 2527, 2531, 2534, 2545, 2556, 2556, 2558, 2558, 2561, 2563, 2565, 2570, 2575, 2576, 2579, 2600, 2602, 2608, 2610, 2611, 2613, 2614, 2616, 2617, 2620, 2620, 2622, 2626, 2631, 2632, 2635, 2637, 2641, 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)
type JSDocParsingMode int
const (
JSDocParsingModeParseAll JSDocParsingMode = iota
JSDocParsingModeParseNone
JSDocParsingModeParseForTypeErrors
JSDocParsingModeParseForTypeInfo
)
type ScannerState struct {
pos int // Current position in text (and ending position of current token)
fullStartPos int // Starting position of current token including preceding whitespace
tokenStart int // Starting position of non-whitespace part of current token
token ast.Kind // Kind of current token
tokenValue string // Parsed value of current token
tokenFlags ast.TokenFlags // Flags for current token
commentDirectives []ast.CommentDirective
skipJSDocLeadingAsterisks int // Leading asterisks to skip when scanning types inside JSDoc. Should be 0 outside JSDoc
}
type Scanner struct {
text string
languageVersion core.ScriptTarget
languageVariant core.LanguageVariant
onError ErrorCallback
skipTrivia bool
JSDocParsingMode JSDocParsingMode
scriptKind core.ScriptKind
ScannerState
}
func defaultScanner() Scanner {
// Using a function rather than a global is intentional; this function is
// inlined as pure code (zeroing + moves), whereas a global requires write
// barriers since the memory is mutable.
return Scanner{languageVersion: core.ScriptTargetLatest, skipTrivia: true}
}
func NewScanner() *Scanner {
s := defaultScanner()
return &s
}
func (s *Scanner) Reset() {
*s = defaultScanner()
}
func (s *Scanner) Text() string {
return s.text
}
func (s *Scanner) Token() ast.Kind {
return s.token
}
func (s *Scanner) TokenFlags() ast.TokenFlags {
return s.tokenFlags
}
func (s *Scanner) TokenFullStart() int {
return s.fullStartPos
}
func (s *Scanner) TokenStart() int {
return s.tokenStart
}
func (s *Scanner) TokenEnd() int {
return s.pos
}
func (s *Scanner) TokenText() string {
return s.text[s.tokenStart:s.pos]
}
func (s *Scanner) TokenValue() string {
return s.tokenValue
}
func (s *Scanner) TokenRange() core.TextRange {
return core.NewTextRange(s.tokenStart, s.pos)
}
func (s *Scanner) CommentDirectives() []ast.CommentDirective {
return s.commentDirectives
}
func (s *Scanner) Mark() ScannerState {
return s.ScannerState
}
func (s *Scanner) Rewind(state ScannerState) {
s.ScannerState = state
}
func (s *Scanner) ResetPos(pos int) {
if pos < 0 {
panic("Cannot reset token state to negative position")
}
s.pos = pos
s.fullStartPos = pos
s.tokenStart = pos
}
func (scanner *Scanner) SetSkipJSDocLeadingAsterisks(skip bool) {
if skip {
scanner.skipJSDocLeadingAsterisks += 1
} else {
scanner.skipJSDocLeadingAsterisks += -1
}
}
func (scanner *Scanner) SetSkipTrivia(skip bool) {
scanner.skipTrivia = skip
}
func (s *Scanner) HasUnicodeEscape() bool {
return s.tokenFlags&ast.TokenFlagsUnicodeEscape != 0
}
func (s *Scanner) HasExtendedUnicodeEscape() bool {
return s.tokenFlags&ast.TokenFlagsExtendedUnicodeEscape != 0
}
func (s *Scanner) HasPrecedingLineBreak() bool {
return s.tokenFlags&ast.TokenFlagsPrecedingLineBreak != 0
}
func (s *Scanner) HasPrecedingJSDocComment() bool {
return s.tokenFlags&ast.TokenFlagsPrecedingJSDocComment != 0
}
func (s *Scanner) HasPrecedingJSDocLeadingAsterisks() bool {
return s.tokenFlags&ast.TokenFlagsPrecedingJSDocLeadingAsterisks != 0
}
func (s *Scanner) SetText(text string) {
s.text = text
s.ScannerState = ScannerState{}
}
func (s *Scanner) SetOnError(errorCallback ErrorCallback) {
s.onError = errorCallback
}
func (s *Scanner) SetScriptTarget(scriptTarget core.ScriptTarget) {
s.languageVersion = scriptTarget
}
func (s *Scanner) SetScriptKind(scriptKind core.ScriptKind) {
s.scriptKind = scriptKind
}
func (s *Scanner) SetJSDocParsingMode(kind JSDocParsingMode) {
s.JSDocParsingMode = kind
}
func (s *Scanner) SetLanguageVariant(languageVariant core.LanguageVariant) {
s.languageVariant = languageVariant
}
func (s *Scanner) error(diagnostic *diagnostics.Message) {
s.errorAt(diagnostic, s.pos, 0)
}
func (s *Scanner) errorAt(diagnostic *diagnostics.Message, pos int, length int, args ...any) {
if s.onError != nil {
s.onError(diagnostic, pos, length, args...)
}
}
// NOTE: even though this returns a rune, it only decodes the current byte.
// It must be checked against utf8.RuneSelf to verify that a call to charAndSize
// is not needed.
func (s *Scanner) char() rune {
if s.pos < len(s.text) {
return rune(s.text[s.pos])
}
return -1
}
// NOTE: this returns a rune, but only decodes the byte at the offset.
func (s *Scanner) charAt(offset int) rune {
if s.pos+offset < len(s.text) {
return rune(s.text[s.pos+offset])
}
return -1
}
func (s *Scanner) charAndSize() (rune, int) {
return utf8.DecodeRuneInString(s.text[s.pos:])
}
func (s *Scanner) shouldParseJSDoc() bool {
switch s.JSDocParsingMode {
case JSDocParsingModeParseAll:
return true
case JSDocParsingModeParseNone:
return false
}
if s.scriptKind != core.ScriptKindTS && s.scriptKind != core.ScriptKindTSX {
// If outside of TS, we need JSDoc to get any type info.
return true
}
if s.JSDocParsingMode == JSDocParsingModeParseForTypeInfo {
// If we're in TS, but we don't need to produce reliable errors,
// we don't need to parse to find @see or @link.
return false
}
text := s.text[s.fullStartPos:s.pos]
for {
i := strings.IndexByte(text, '@')
if i < 0 {
break
}
text = text[i+1:]
if strings.HasPrefix(text, "see") || strings.HasPrefix(text, "link") {
return true
}
}
return false
}
func (s *Scanner) Scan() ast.Kind {
s.fullStartPos = s.pos
s.tokenFlags = ast.TokenFlagsNone
for {
s.tokenStart = s.pos
ch := s.char()
switch ch {
case '\t', '\v', '\f', ' ':
s.pos++
if s.skipTrivia {
continue
}
for {
ch, size := s.charAndSize()
if !stringutil.IsWhiteSpaceSingleLine(ch) {
break
}
s.pos += size
}
s.token = ast.KindWhitespaceTrivia
case '\n', '\r':
s.tokenFlags |= ast.TokenFlagsPrecedingLineBreak
if s.skipTrivia {
s.pos++
continue
}
if ch == '\r' && s.charAt(1) == '\n' {
s.pos += 2
} else {
s.pos++
}
s.token = ast.KindNewLineTrivia
case '!':
if s.charAt(1) == '=' {
if s.charAt(2) == '=' {
s.pos += 3
s.token = ast.KindExclamationEqualsEqualsToken
} else {
s.pos += 2
s.token = ast.KindExclamationEqualsToken
}
} else {
s.pos++
s.token = ast.KindExclamationToken
}
case '"', '\'':
s.tokenValue = s.scanString(false /*jsxAttributeString*/)
s.token = ast.KindStringLiteral
case '`':
s.token = s.scanTemplateAndSetTokenValue(false /*shouldEmitInvalidEscapeError*/)
case '%':
if s.charAt(1) == '=' {
s.pos += 2
s.token = ast.KindPercentEqualsToken
} else {
s.pos++
s.token = ast.KindPercentToken
}
case '&':
if s.charAt(1) == '&' {
if s.charAt(2) == '=' {
s.pos += 3
s.token = ast.KindAmpersandAmpersandEqualsToken
} else {
s.pos += 2
s.token = ast.KindAmpersandAmpersandToken
}
} else if s.charAt(1) == '=' {
s.pos += 2
s.token = ast.KindAmpersandEqualsToken
} else {
s.pos++
s.token = ast.KindAmpersandToken
}
case '(':
s.pos++
s.token = ast.KindOpenParenToken
case ')':
s.pos++
s.token = ast.KindCloseParenToken
case '*':
if s.charAt(1) == '=' {
s.pos += 2
s.token = ast.KindAsteriskEqualsToken
} else if s.charAt(1) == '*' {
if s.charAt(2) == '=' {
s.pos += 3
s.token = ast.KindAsteriskAsteriskEqualsToken
} else {
s.pos += 2
s.token = ast.KindAsteriskAsteriskToken
}
} else {
s.pos++
if s.skipJSDocLeadingAsterisks != 0 &&
(s.tokenFlags&ast.TokenFlagsPrecedingJSDocLeadingAsterisks) == 0 &&
(s.tokenFlags&ast.TokenFlagsPrecedingLineBreak) != 0 {
s.tokenFlags |= ast.TokenFlagsPrecedingJSDocLeadingAsterisks
continue
}
s.token = ast.KindAsteriskToken
}
case '+':
if s.charAt(1) == '=' {
s.pos += 2
s.token = ast.KindPlusEqualsToken
} else if s.charAt(1) == '+' {
s.pos += 2
s.token = ast.KindPlusPlusToken
} else {
s.pos++
s.token = ast.KindPlusToken
}
case ',':
s.pos++
s.token = ast.KindCommaToken
case '-':
if s.charAt(1) == '=' {
s.pos += 2
s.token = ast.KindMinusEqualsToken
} else if s.charAt(1) == '-' {
s.pos += 2
s.token = ast.KindMinusMinusToken
} else {
s.pos++
s.token = ast.KindMinusToken
}
case '.':
if stringutil.IsDigit(s.charAt(1)) {
s.token = s.scanNumber()
} else if s.charAt(1) == '.' && s.charAt(2) == '.' {
s.pos += 3
s.token = ast.KindDotDotDotToken
} else {
s.pos++
s.token = ast.KindDotToken
}
case '/':
// Single-line comment
if s.charAt(1) == '/' {
s.pos += 2
for {
ch1, size := s.charAndSize()
if size == 0 || stringutil.IsLineBreak(ch1) {
break
}
s.pos += size
}
s.processCommentDirective(s.tokenStart, s.pos, false)
if s.skipTrivia {
continue
}
s.token = ast.KindSingleLineCommentTrivia
return s.token
}
// Multi-line comment
if s.charAt(1) == '*' {
s.pos += 2
isJSDoc := s.char() == '*' && s.charAt(1) != '/'
commentClosed := false
lastLineStart := s.tokenStart
for {
ch1, size := s.charAndSize()
if size == 0 {
break
}
if ch1 == '*' && s.charAt(1) == '/' {
s.pos += 2
commentClosed = true
break
}
s.pos += size
if stringutil.IsLineBreak(ch1) {
lastLineStart = s.pos
s.tokenFlags |= ast.TokenFlagsPrecedingLineBreak
}
}
if isJSDoc && s.shouldParseJSDoc() {
s.tokenFlags |= ast.TokenFlagsPrecedingJSDocComment
}
s.processCommentDirective(lastLineStart, s.pos, true)
if !commentClosed {
s.error(diagnostics.Asterisk_Slash_expected)
}
if s.skipTrivia {
continue
}
if !commentClosed {
s.tokenFlags |= ast.TokenFlagsUnterminated
}
s.token = ast.KindMultiLineCommentTrivia
return s.token
}
if s.charAt(1) == '=' {
s.pos += 2
s.token = ast.KindSlashEqualsToken
} else {
s.pos++
s.token = ast.KindSlashToken
}
case '0':
if s.charAt(1) == 'X' || s.charAt(1) == 'x' {
s.pos += 2
digits := s.scanHexDigits(1, true, true)
if digits == "" {
s.error(diagnostics.Hexadecimal_digit_expected)
digits = "0"
}
s.tokenValue = "0x" + digits
s.tokenFlags |= ast.TokenFlagsHexSpecifier
s.token = s.scanBigIntSuffix()
break
}
if s.charAt(1) == 'B' || s.charAt(1) == 'b' {
s.pos += 2
digits := s.scanBinaryOrOctalDigits(2)
if digits == "" {
s.error(diagnostics.Binary_digit_expected)
digits = "0"
}
s.tokenValue = "0b" + digits
s.tokenFlags |= ast.TokenFlagsBinarySpecifier
s.token = s.scanBigIntSuffix()
break
}
if s.charAt(1) == 'O' || s.charAt(1) == 'o' {
s.pos += 2
digits := s.scanBinaryOrOctalDigits(8)
if digits == "" {
s.error(diagnostics.Octal_digit_expected)
digits = "0"
}
s.tokenValue = "0o" + digits
s.tokenFlags |= ast.TokenFlagsOctalSpecifier
s.token = s.scanBigIntSuffix()
break
}
fallthrough
case '1', '2', '3', '4', '5', '6', '7', '8', '9':
s.token = s.scanNumber()
case ':':
s.pos++
s.token = ast.KindColonToken
case ';':
s.pos++
s.token = ast.KindSemicolonToken
case '<':
if isConflictMarkerTrivia(s.text, s.pos) {
s.pos = scanConflictMarkerTrivia(s.text, s.pos, s.errorAt)
if s.skipTrivia {
continue
} else {
s.token = ast.KindConflictMarkerTrivia
return s.token
}
}
if s.charAt(1) == '<' {
if s.charAt(2) == '=' {
s.pos += 3
s.token = ast.KindLessThanLessThanEqualsToken
} else {
s.pos += 2
s.token = ast.KindLessThanLessThanToken
}
} else if s.charAt(1) == '=' {
s.pos += 2
s.token = ast.KindLessThanEqualsToken
} else if s.languageVariant == core.LanguageVariantJSX && s.charAt(1) == '/' && s.charAt(2) != '*' {
s.pos += 2
s.token = ast.KindLessThanSlashToken
} else {
s.pos++
s.token = ast.KindLessThanToken
}
case '=':
if isConflictMarkerTrivia(s.text, s.pos) {
s.pos = scanConflictMarkerTrivia(s.text, s.pos, s.errorAt)
if s.skipTrivia {
continue
} else {
s.token = ast.KindConflictMarkerTrivia
return s.token
}
}
if s.charAt(1) == '=' {
if s.charAt(2) == '=' {
s.pos += 3
s.token = ast.KindEqualsEqualsEqualsToken
} else {
s.pos += 2
s.token = ast.KindEqualsEqualsToken
}
} else if s.charAt(1) == '>' {
s.pos += 2
s.token = ast.KindEqualsGreaterThanToken
} else {
s.pos++
s.token = ast.KindEqualsToken
}
case '>':
if isConflictMarkerTrivia(s.text, s.pos) {
s.pos = scanConflictMarkerTrivia(s.text, s.pos, s.errorAt)
if s.skipTrivia {
continue
} else {
s.token = ast.KindConflictMarkerTrivia
return s.token
}
}
s.pos++
s.token = ast.KindGreaterThanToken
case '?':
if s.charAt(1) == '.' && !stringutil.IsDigit(s.charAt(2)) {
s.pos += 2
s.token = ast.KindQuestionDotToken
} else if s.charAt(1) == '?' {
if s.charAt(2) == '=' {
s.pos += 3
s.token = ast.KindQuestionQuestionEqualsToken
} else {
s.pos += 2
s.token = ast.KindQuestionQuestionToken
}
} else {
s.pos++
s.token = ast.KindQuestionToken
}
case '[':
s.pos++
s.token = ast.KindOpenBracketToken
case ']':
s.pos++
s.token = ast.KindCloseBracketToken
case '^':
if s.charAt(1) == '=' {
s.pos += 2
s.token = ast.KindCaretEqualsToken
} else {
s.pos++
s.token = ast.KindCaretToken
}
case '{':
s.pos++
s.token = ast.KindOpenBraceToken
case '|':
if isConflictMarkerTrivia(s.text, s.pos) {
s.pos = scanConflictMarkerTrivia(s.text, s.pos, s.errorAt)
if s.skipTrivia {
continue
} else {
s.token = ast.KindConflictMarkerTrivia
return s.token
}
}
if s.charAt(1) == '|' {
if s.charAt(2) == '=' {
s.pos += 3
s.token = ast.KindBarBarEqualsToken
} else {
s.pos += 2
s.token = ast.KindBarBarToken
}
} else if s.charAt(1) == '=' {
s.pos += 2
s.token = ast.KindBarEqualsToken
} else {
s.pos++
s.token = ast.KindBarToken
}
case '}':
s.pos++
s.token = ast.KindCloseBraceToken
case '~':
s.pos++
s.token = ast.KindTildeToken
case '@':
s.pos++
s.token = ast.KindAtToken
case '\\':
cp := s.peekUnicodeEscape()
if cp >= 0 && isIdentifierStart(cp, s.languageVersion) {
s.tokenValue = string(s.scanUnicodeEscape(true)) + s.scanIdentifierParts()
s.token = GetIdentifierToken(s.tokenValue)
} else {
s.scanInvalidCharacter()
}
case '#':
if s.charAt(1) == '!' {
if s.pos == 0 {
s.pos += 2
for ch, size := s.charAndSize(); size > 0 && !stringutil.IsLineBreak(ch); ch, size = s.charAndSize() {
s.pos += size
}
continue
}
s.errorAt(diagnostics.X_can_only_be_used_at_the_start_of_a_file, s.pos, 2)
s.pos++
s.token = ast.KindUnknown
break
}
if s.charAt(1) == '\\' {
s.pos++
cp := s.peekUnicodeEscape()
if cp >= 0 && isIdentifierStart(cp, s.languageVersion) {
s.tokenValue = "#" + string(s.scanUnicodeEscape(true)) + s.scanIdentifierParts()
s.token = ast.KindPrivateIdentifier
break
}
s.pos--
}
if s.scanIdentifier(1) {
s.token = ast.KindPrivateIdentifier
} else {
s.errorAt(diagnostics.Invalid_character, s.pos-1, 1)
s.token = ast.KindUnknown
}
default:
if ch < 0 {
s.token = ast.KindEndOfFile
break
}
if s.scanIdentifier(0) {
s.token = GetIdentifierToken(s.tokenValue)
break
}
ch, size := s.charAndSize()
if ch == utf8.RuneError && size == 1 {
s.errorAt(diagnostics.File_appears_to_be_binary, 0, 0)
s.pos = len(s.text)
s.token = ast.KindNonTextFileMarkerTrivia
break
}
if stringutil.IsWhiteSpaceSingleLine(ch) {
s.pos += size
// If we get here and it's not 0x0085 (nextLine), then we're handling non-ASCII whitespace.
// Handle skipTrivia like we do in the space case above.
if ch == 0x0085 || s.skipTrivia {
continue
}
for {
ch, size = s.charAndSize()
if !stringutil.IsWhiteSpaceSingleLine(ch) {
break
}
s.pos += size
}
s.token = ast.KindWhitespaceTrivia
return s.token
}
if stringutil.IsLineBreak(ch) {
s.tokenFlags |= ast.TokenFlagsPrecedingLineBreak
s.pos += size
continue
}
s.scanInvalidCharacter()
}
return s.token
}
}
func (s *Scanner) processCommentDirective(start int, end int, multiline bool) {
// Skip starting slashes and whitespace
pos := start
if multiline {
for pos < len(s.text) && (s.text[pos] == '*' || s.text[pos] == '/') {
pos++
}
} else {
// Skip "//" for single line comments
pos += 2
}
for pos < len(s.text) && (s.text[pos] == ' ' || s.text[pos] == '\t') {
pos++
}
// Directive must start with '@'
if !(pos < len(s.text) && s.text[pos] == '@') {
return
}
pos++
var kind ast.CommentDirectiveKind
switch {
case strings.HasPrefix(s.text[pos:], "ts-expect-error"):
kind = ast.CommentDirectiveKindExpectError
case strings.HasPrefix(s.text[pos:], "ts-ignore"):
kind = ast.CommentDirectiveKindIgnore
default:
return
}
s.commentDirectives = append(s.commentDirectives, ast.CommentDirective{Loc: core.NewTextRange(start, end), Kind: kind})
}
func (s *Scanner) ReScanLessThanToken() ast.Kind {
if s.token == ast.KindLessThanLessThanToken {
s.pos = s.tokenStart + 1
s.token = ast.KindLessThanToken
}
return s.token
}
func (s *Scanner) ReScanGreaterThanToken() ast.Kind {
if s.token == ast.KindGreaterThanToken {
s.pos = s.tokenStart + 1
if s.char() == '>' {
if s.charAt(1) == '>' {
if s.charAt(2) == '=' {
s.pos += 3
s.token = ast.KindGreaterThanGreaterThanGreaterThanEqualsToken
} else {
s.pos += 2
s.token = ast.KindGreaterThanGreaterThanGreaterThanToken
}
} else if s.charAt(1) == '=' {
s.pos += 2
s.token = ast.KindGreaterThanGreaterThanEqualsToken
} else {
s.pos++
s.token = ast.KindGreaterThanGreaterThanToken
}
} else if s.char() == '=' {
s.pos++
s.token = ast.KindGreaterThanEqualsToken
}
}
return s.token
}
func (s *Scanner) ReScanTemplateToken(isTaggedTemplate bool) ast.Kind {
s.pos = s.tokenStart
s.token = s.scanTemplateAndSetTokenValue(!isTaggedTemplate)
return s.token
}
func (s *Scanner) ReScanAsteriskEqualsToken() ast.Kind {
if s.token != ast.KindAsteriskEqualsToken {
panic("'ReScanAsteriskEqualsToken' should only be called on a '*='")
}
s.pos = s.tokenStart + 1
s.token = ast.KindEqualsToken
return s.token
}
// !!! https://github.com/microsoft/TypeScript/pull/55600