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Copy pathtokenizer.ts
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1674 lines (1601 loc) · 45.3 KB
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/**
* @fileoverview A TypeScript tokenizer modified for AssemblyScript.
*
* The `Tokenizer` scans over a source file and returns one syntactic token
* at a time that the parser will combine to an abstract syntax tree.
*
* It skips over trivia like comments and whitespace and provides a general
* mark/reset mechanism for the parser to utilize on ambiguous tokens, with
* one token of lookahead otherwise.
*
* @license Apache-2.0
*/
import {
DiagnosticCode,
DiagnosticMessage,
DiagnosticEmitter
} from "./diagnostics";
import {
Source,
CommentKind
} from "./ast";
import {
CharCode,
isLineBreak,
isWhiteSpace,
isIdentifierStart,
isIdentifierPart,
isDecimalDigit,
isOctalDigit,
isKeywordCharacter
} from "./util";
/** Named token types. */
export enum Token {
// keywords
// discarded: ANY, BOOLEAN, NEVER, NUMBER, STRING, SYMBOL, UNDEFINED, LESSTHAN_SLASH
ABSTRACT,
AS,
ASYNC,
AWAIT, // ES2017
BREAK, // ES2017
CASE, // ES2017
CATCH, // ES2017
CLASS, // ES2017
CONST, // ES2017
CONTINUE, // ES2017
CONSTRUCTOR,
DEBUGGER, // ES2017
DECLARE,
DEFAULT, // ES2017
DELETE, // ES2017
DO, // ES2017
ELSE, // ES2017
ENUM, // ES2017 future
EXPORT, // ES2017
EXTENDS, // ES2017
FALSE, // ES
FINALLY, // ES2017
FOR, // ES2017
FROM, // AS possible identifier
FUNCTION, // ES2017
GET,
IF, // ES2017
IMPLEMENTS, // ES2017 non-lexical
IMPORT, // ES2017
IN, // ES2017
INSTANCEOF, // ES2017
INTERFACE, // ES2017 non-lexical
IS,
KEYOF,
LET, // ES2017 non-lexical
MODULE, // AS possible identifier
NAMESPACE, // AS possible identifier
NEW, // ES2017
NULL, // ES
OF,
PACKAGE, // ES2017 non-lexical
PRIVATE, // ES2017 non-lexical
PROTECTED, // ES2017 non-lexical
PUBLIC, // ES2017 non-lexical
READONLY,
RETURN, // ES2017
SET,
STATIC, // ES2017 non-lexical
SUPER, // ES2017
SWITCH, // ES2017
THIS, // ES2017
THROW, // ES2017
TRUE, // ES
TRY, // ES2017
TYPE, // AS possible identifier
TYPEOF, // ES2017
VAR, // ES2017
VOID, // ES2017
WHILE, // ES2017
WITH, // ES2017
YIELD, // ES2017
// punctuation
OPENBRACE,
CLOSEBRACE,
OPENPAREN,
CLOSEPAREN,
OPENBRACKET,
CLOSEBRACKET,
DOT,
DOT_DOT_DOT,
SEMICOLON,
COMMA,
LESSTHAN,
GREATERTHAN,
LESSTHAN_EQUALS,
GREATERTHAN_EQUALS,
EQUALS_EQUALS,
EXCLAMATION_EQUALS,
EQUALS_EQUALS_EQUALS,
EXCLAMATION_EQUALS_EQUALS,
EQUALS_GREATERTHAN,
PLUS,
MINUS,
ASTERISK_ASTERISK,
ASTERISK,
SLASH,
PERCENT,
PLUS_PLUS,
MINUS_MINUS,
LESSTHAN_LESSTHAN,
GREATERTHAN_GREATERTHAN,
GREATERTHAN_GREATERTHAN_GREATERTHAN,
AMPERSAND,
BAR,
CARET,
EXCLAMATION,
TILDE,
AMPERSAND_AMPERSAND,
BAR_BAR,
QUESTION,
COLON,
EQUALS,
PLUS_EQUALS,
MINUS_EQUALS,
ASTERISK_EQUALS,
ASTERISK_ASTERISK_EQUALS,
SLASH_EQUALS,
PERCENT_EQUALS,
LESSTHAN_LESSTHAN_EQUALS,
GREATERTHAN_GREATERTHAN_EQUALS,
GREATERTHAN_GREATERTHAN_GREATERTHAN_EQUALS,
AMPERSAND_EQUALS,
BAR_EQUALS,
CARET_EQUALS,
AT,
// literals
IDENTIFIER,
STRINGLITERAL,
INTEGERLITERAL,
FLOATLITERAL,
// meta
INVALID,
ENDOFFILE
}
export enum IdentifierHandling {
DEFAULT,
PREFER,
ALWAYS
}
export function tokenFromKeyword(text: string): Token {
assert(text.length);
switch (text.charCodeAt(0)) {
case CharCode.a: {
if (text == "abstract") return Token.ABSTRACT;
if (text == "as") return Token.AS;
if (text == "async") return Token.ASYNC;
if (text == "await") return Token.AWAIT;
break;
}
case CharCode.b: {
if (text == "break") return Token.BREAK;
break;
}
case CharCode.c: {
if (text == "case") return Token.CASE;
if (text == "catch") return Token.CATCH;
if (text == "class") return Token.CLASS;
if (text == "continue") return Token.CONTINUE;
if (text == "const") return Token.CONST;
if (text == "constructor") return Token.CONSTRUCTOR;
break;
}
case CharCode.d: {
if (text == "debugger") return Token.DEBUGGER;
if (text == "declare") return Token.DECLARE;
if (text == "default") return Token.DEFAULT;
if (text == "delete") return Token.DELETE;
if (text == "do") return Token.DO;
break;
}
case CharCode.e: {
if (text == "else") return Token.ELSE;
if (text == "enum") return Token.ENUM;
if (text == "export") return Token.EXPORT;
if (text == "extends") return Token.EXTENDS;
break;
}
case CharCode.f: {
if (text == "false") return Token.FALSE;
if (text == "finally") return Token.FINALLY;
if (text == "for") return Token.FOR;
if (text == "from") return Token.FROM;
if (text == "function") return Token.FUNCTION;
break;
}
case CharCode.g: {
if (text == "get") return Token.GET;
break;
}
case CharCode.i: {
if (text == "if") return Token.IF;
if (text == "implements") return Token.IMPLEMENTS;
if (text == "import") return Token.IMPORT;
if (text == "in") return Token.IN;
if (text == "instanceof") return Token.INSTANCEOF;
if (text == "interface") return Token.INTERFACE;
if (text == "is") return Token.IS;
break;
}
case CharCode.k: {
if (text == "keyof") return Token.KEYOF;
break;
}
case CharCode.l: {
if (text == "let") return Token.LET;
break;
}
case CharCode.m: {
if (text == "module") return Token.MODULE;
break;
}
case CharCode.n: {
if (text == "namespace") return Token.NAMESPACE;
if (text == "new") return Token.NEW;
if (text == "null") return Token.NULL;
break;
}
case CharCode.o: {
if (text == "of") return Token.OF;
break;
}
case CharCode.p: {
if (text == "package") return Token.PACKAGE;
if (text == "private") return Token.PRIVATE;
if (text == "protected") return Token.PROTECTED;
if (text == "public") return Token.PUBLIC;
break;
}
case CharCode.r: {
if (text == "readonly") return Token.READONLY;
if (text == "return") return Token.RETURN;
break;
}
case CharCode.s: {
if (text == "set") return Token.SET;
if (text == "static") return Token.STATIC;
if (text == "super") return Token.SUPER;
if (text == "switch") return Token.SWITCH;
break;
}
case CharCode.t: {
if (text == "this") return Token.THIS;
if (text == "throw") return Token.THROW;
if (text == "true") return Token.TRUE;
if (text == "try") return Token.TRY;
if (text == "type") return Token.TYPE;
if (text == "typeof") return Token.TYPEOF;
break;
}
case CharCode.v: {
if (text == "var") return Token.VAR;
if (text == "void") return Token.VOID;
break;
}
case CharCode.w: {
if (text == "while") return Token.WHILE;
if (text == "with") return Token.WITH;
break;
}
case CharCode.y: {
if (text == "yield") return Token.YIELD;
break;
}
}
return Token.INVALID;
}
export function tokenIsAlsoIdentifier(token: Token): bool {
switch (token) {
case Token.ABSTRACT:
case Token.AS:
case Token.CONSTRUCTOR:
case Token.DECLARE:
case Token.DELETE:
case Token.FROM:
case Token.FOR:
case Token.GET:
case Token.INSTANCEOF:
case Token.IS:
case Token.KEYOF:
case Token.MODULE:
case Token.NAMESPACE:
case Token.NULL:
case Token.READONLY:
case Token.SET:
case Token.TYPE:
case Token.VOID: return true;
default: return false;
}
}
export function isIllegalVariableIdentifier(name: string): bool {
assert(name.length);
switch (name.charCodeAt(0)) {
case CharCode.d: return name == "delete";
case CharCode.f: return name == "for";
case CharCode.i: return name == "instanceof";
case CharCode.n: return name == "null";
case CharCode.v: return name == "void";
}
return false;
}
export function operatorTokenToString(token: Token): string {
switch (token) {
case Token.DELETE: return "delete";
case Token.IN: return "in";
case Token.INSTANCEOF: return "instanceof";
case Token.NEW: return "new";
case Token.TYPEOF: return "typeof";
case Token.VOID: return "void";
case Token.YIELD: return "yield";
case Token.DOT_DOT_DOT: return "...";
case Token.COMMA: return ",";
case Token.LESSTHAN: return "<";
case Token.GREATERTHAN: return ">";
case Token.LESSTHAN_EQUALS: return "<=";
case Token.GREATERTHAN_EQUALS: return ">=";
case Token.EQUALS_EQUALS: return "==";
case Token.EXCLAMATION_EQUALS: return "!=";
case Token.EQUALS_EQUALS_EQUALS: return "===";
case Token.EXCLAMATION_EQUALS_EQUALS: return "!==";
case Token.PLUS: return "+";
case Token.MINUS: return "-";
case Token.ASTERISK_ASTERISK: return "**";
case Token.ASTERISK: return "*";
case Token.SLASH: return "/";
case Token.PERCENT: return "%";
case Token.PLUS_PLUS: return "++";
case Token.MINUS_MINUS: return "--";
case Token.LESSTHAN_LESSTHAN: return "<<";
case Token.GREATERTHAN_GREATERTHAN: return ">>";
case Token.GREATERTHAN_GREATERTHAN_GREATERTHAN: return ">>>";
case Token.AMPERSAND: return "&";
case Token.BAR: return "|";
case Token.CARET: return "^";
case Token.EXCLAMATION: return "!";
case Token.TILDE: return "~";
case Token.AMPERSAND_AMPERSAND: return "&&";
case Token.BAR_BAR: return "||";
case Token.EQUALS: return "=";
case Token.PLUS_EQUALS: return "+=";
case Token.MINUS_EQUALS: return "-=";
case Token.ASTERISK_EQUALS: return "*=";
case Token.ASTERISK_ASTERISK_EQUALS: return "**=";
case Token.SLASH_EQUALS: return "/=";
case Token.PERCENT_EQUALS: return "%=";
case Token.LESSTHAN_LESSTHAN_EQUALS: return "<<=";
case Token.GREATERTHAN_GREATERTHAN_EQUALS: return ">>=";
case Token.GREATERTHAN_GREATERTHAN_GREATERTHAN_EQUALS: return ">>>=";
case Token.AMPERSAND_EQUALS: return "&=";
case Token.BAR_EQUALS: return "|=";
case Token.CARET_EQUALS: return "^=";
default: {
assert(false);
return "";
}
}
}
export class Range {
start: i32;
end: i32;
source!: Source;
debugInfoRef: usize = 0;
constructor(start: i32, end: i32) {
this.start = start;
this.end = end;
}
static join(a: Range, b: Range): Range {
if (a.source != b.source) throw new Error("source mismatch");
let range = new Range(
a.start < b.start ? a.start : b.start,
a.end > b.end ? a.end : b.end
);
range.source = a.source;
return range;
}
equals(other: Range): bool {
return this.source == other.source && this.start == other.start && this.end == other.end;
}
get atStart(): Range {
let range = new Range(this.start, this.start);
range.source = this.source;
return range;
}
get atEnd(): Range {
let range = new Range(this.end, this.end);
range.source = this.source;
return range;
}
toString(): string {
return this.source.text.substring(this.start, this.end);
}
}
/** Handler for intercepting comments while tokenizing. */
export type CommentHandler = (kind: CommentKind, text: string, range: Range) => void;
/** Tokenizes a source to individual {@link Token}s. */
export class Tokenizer extends DiagnosticEmitter {
source: Source;
end: i32 = 0;
pos: i32 = 0;
token: Token = -1;
tokenPos: i32 = 0;
nextToken: Token = -1;
nextTokenPos: i32 = 0;
nextTokenOnNewLine: bool = false;
onComment: CommentHandler | null = null;
/** Constructs a new tokenizer. */
constructor(source: Source, diagnostics: DiagnosticMessage[] | null = null) {
super(diagnostics);
if (!diagnostics) diagnostics = [];
this.diagnostics = diagnostics;
this.source = source;
var text = source.text;
var end = text.length;
var pos = 0;
// skip bom
if (
pos < end &&
text.charCodeAt(pos) == CharCode.BYTEORDERMARK
) {
++pos;
}
// skip shebang
if (
pos + 1 < end &&
text.charCodeAt(pos) == CharCode.HASH &&
text.charCodeAt(pos + 1) == CharCode.EXCLAMATION
) {
pos += 2;
while (
pos < end &&
text.charCodeAt(pos) != CharCode.LINEFEED
) {
++pos;
}
// 'next' now starts at lf or eof
}
this.pos = pos;
this.end = end;
}
next(identifierHandling: IdentifierHandling = IdentifierHandling.DEFAULT): Token {
this.nextToken = -1;
var token: Token;
do token = this.unsafeNext(identifierHandling);
while (token == Token.INVALID);
this.token = token;
return token;
}
private unsafeNext(
identifierHandling: IdentifierHandling = IdentifierHandling.DEFAULT,
maxTokenLength: i32 = i32.MAX_VALUE
): Token {
var text = this.source.text;
var end = this.end;
var pos = this.pos;
while (pos < end) {
this.tokenPos = pos;
let c = text.charCodeAt(pos);
switch (c) {
case CharCode.CARRIAGERETURN: {
if (!(
++pos < end &&
text.charCodeAt(pos) == CharCode.LINEFEED
)) break;
// otherwise fall-through
}
case CharCode.LINEFEED:
case CharCode.TAB:
case CharCode.VERTICALTAB:
case CharCode.FORMFEED:
case CharCode.SPACE: {
++pos;
break;
}
case CharCode.EXCLAMATION: {
++pos;
if (
maxTokenLength > 1 && pos < end &&
text.charCodeAt(pos) == CharCode.EQUALS
) {
++pos;
if (
maxTokenLength > 2 && pos < end &&
text.charCodeAt(pos) == CharCode.EQUALS
) {
this.pos = pos + 1;
return Token.EXCLAMATION_EQUALS_EQUALS;
}
this.pos = pos;
return Token.EXCLAMATION_EQUALS;
}
this.pos = pos;
return Token.EXCLAMATION;
}
case CharCode.DOUBLEQUOTE:
case CharCode.SINGLEQUOTE:
case CharCode.BACKTICK: { // TODO
this.pos = pos;
return Token.STRINGLITERAL; // expects a call to readString
}
case CharCode.PERCENT: {
++pos;
if (
maxTokenLength > 1 && pos < end &&
text.charCodeAt(pos) == CharCode.EQUALS
) {
this.pos = pos + 1;
return Token.PERCENT_EQUALS;
}
this.pos = pos;
return Token.PERCENT;
}
case CharCode.AMPERSAND: {
++pos;
if (maxTokenLength > 1 && pos < end) {
let chr = text.charCodeAt(pos);
if (chr == CharCode.AMPERSAND) {
this.pos = pos + 1;
return Token.AMPERSAND_AMPERSAND;
}
if (chr == CharCode.EQUALS) {
this.pos = pos + 1;
return Token.AMPERSAND_EQUALS;
}
}
this.pos = pos;
return Token.AMPERSAND;
}
case CharCode.OPENPAREN: {
this.pos = pos + 1;
return Token.OPENPAREN;
}
case CharCode.CLOSEPAREN: {
this.pos = pos + 1;
return Token.CLOSEPAREN;
}
case CharCode.ASTERISK: {
++pos;
if (maxTokenLength > 1 && pos < end) {
let chr = text.charCodeAt(pos);
if (chr == CharCode.EQUALS) {
this.pos = pos + 1;
return Token.ASTERISK_EQUALS;
}
if (chr == CharCode.ASTERISK) {
++pos;
if (
maxTokenLength > 2 && pos < end &&
text.charCodeAt(pos) == CharCode.EQUALS
) {
this.pos = pos + 1;
return Token.ASTERISK_ASTERISK_EQUALS;
}
this.pos = pos;
return Token.ASTERISK_ASTERISK;
}
}
this.pos = pos;
return Token.ASTERISK;
}
case CharCode.PLUS: {
++pos;
if (maxTokenLength > 1 && pos < end) {
let chr = text.charCodeAt(pos);
if (chr == CharCode.PLUS) {
this.pos = pos + 1;
return Token.PLUS_PLUS;
}
if (chr == CharCode.EQUALS) {
this.pos = pos + 1;
return Token.PLUS_EQUALS;
}
}
this.pos = pos;
return Token.PLUS;
}
case CharCode.COMMA: {
this.pos = pos + 1;
return Token.COMMA;
}
case CharCode.MINUS: {
++pos;
if (maxTokenLength > 1 && pos < end) {
let chr = text.charCodeAt(pos);
if (chr == CharCode.MINUS) {
this.pos = pos + 1;
return Token.MINUS_MINUS;
}
if (chr == CharCode.EQUALS) {
this.pos = pos + 1;
return Token.MINUS_EQUALS;
}
}
this.pos = pos;
return Token.MINUS;
}
case CharCode.DOT: {
++pos;
if (maxTokenLength > 1 && pos < end) {
let chr = text.charCodeAt(pos);
if (isDecimalDigit(chr)) {
this.pos = pos - 1;
return Token.FLOATLITERAL; // expects a call to readFloat
}
if (
maxTokenLength > 2 && pos + 1 < end &&
chr == CharCode.DOT &&
text.charCodeAt(pos + 1) == CharCode.DOT
) {
this.pos = pos + 2;
return Token.DOT_DOT_DOT;
}
}
this.pos = pos;
return Token.DOT;
}
case CharCode.SLASH: {
let commentStartPos = pos;
++pos;
if (maxTokenLength > 1 && pos < end) {
let chr = text.charCodeAt(pos);
if (chr == CharCode.SLASH) { // single-line
let commentKind = CommentKind.LINE;
if (
pos + 1 < end &&
text.charCodeAt(pos + 1) == CharCode.SLASH
) {
++pos;
commentKind = CommentKind.TRIPLE;
}
while (++pos < end) {
if (text.charCodeAt(pos) == CharCode.LINEFEED) {
++pos;
break;
}
}
if (this.onComment) {
this.onComment(
commentKind,
text.substring(commentStartPos, pos),
this.range(commentStartPos, pos)
);
}
break;
}
if (chr == CharCode.ASTERISK) { // multi-line
let closed = false;
while (++pos < end) {
c = text.charCodeAt(pos);
if (
c == CharCode.ASTERISK &&
pos + 1 < end &&
text.charCodeAt(pos + 1) == CharCode.SLASH
) {
pos += 2;
closed = true;
break;
}
}
if (!closed) {
this.error(
DiagnosticCode._0_expected,
this.range(pos), "*/"
);
} else if (this.onComment) {
this.onComment(
CommentKind.BLOCK,
text.substring(commentStartPos, pos),
this.range(commentStartPos, pos)
);
}
break;
}
if (chr == CharCode.EQUALS) {
this.pos = pos + 1;
return Token.SLASH_EQUALS;
}
}
this.pos = pos;
return Token.SLASH;
}
case CharCode._0:
case CharCode._1:
case CharCode._2:
case CharCode._3:
case CharCode._4:
case CharCode._5:
case CharCode._6:
case CharCode._7:
case CharCode._8:
case CharCode._9: {
this.pos = pos;
return this.testInteger()
? Token.INTEGERLITERAL // expects a call to readInteger
: Token.FLOATLITERAL; // expects a call to readFloat
}
case CharCode.COLON: {
this.pos = pos + 1;
return Token.COLON;
}
case CharCode.SEMICOLON: {
this.pos = pos + 1;
return Token.SEMICOLON;
}
case CharCode.LESSTHAN: {
++pos;
if (maxTokenLength > 1 && pos < end) {
let chr = text.charCodeAt(pos);
if (chr == CharCode.LESSTHAN) {
++pos;
if (
maxTokenLength > 2 &&
pos < end &&
text.charCodeAt(pos) == CharCode.EQUALS
) {
this.pos = pos + 1;
return Token.LESSTHAN_LESSTHAN_EQUALS;
}
this.pos = pos;
return Token.LESSTHAN_LESSTHAN;
}
if (chr == CharCode.EQUALS) {
this.pos = pos + 1;
return Token.LESSTHAN_EQUALS;
}
}
this.pos = pos;
return Token.LESSTHAN;
}
case CharCode.EQUALS: {
++pos;
if (maxTokenLength > 1 && pos < end) {
let chr = text.charCodeAt(pos);
if (chr == CharCode.EQUALS) {
++pos;
if (
maxTokenLength > 2 &&
pos < end &&
text.charCodeAt(pos) == CharCode.EQUALS
) {
this.pos = pos + 1;
return Token.EQUALS_EQUALS_EQUALS;
}
this.pos = pos;
return Token.EQUALS_EQUALS;
}
if (chr == CharCode.GREATERTHAN) {
this.pos = pos + 1;
return Token.EQUALS_GREATERTHAN;
}
}
this.pos = pos;
return Token.EQUALS;
}
case CharCode.GREATERTHAN: {
++pos;
if (maxTokenLength > 1 && pos < end) {
let chr = text.charCodeAt(pos);
if (chr == CharCode.GREATERTHAN) {
++pos;
if (maxTokenLength > 2 && pos < end) {
chr = text.charCodeAt(pos);
if (chr == CharCode.GREATERTHAN) {
++pos;
if (
maxTokenLength > 3 && pos < end &&
text.charCodeAt(pos) == CharCode.EQUALS
) {
this.pos = pos + 1;
return Token.GREATERTHAN_GREATERTHAN_GREATERTHAN_EQUALS;
}
this.pos = pos;
return Token.GREATERTHAN_GREATERTHAN_GREATERTHAN;
}
if (chr == CharCode.EQUALS) {
this.pos = pos + 1;
return Token.GREATERTHAN_GREATERTHAN_EQUALS;
}
}
this.pos = pos;
return Token.GREATERTHAN_GREATERTHAN;
}
if (chr == CharCode.EQUALS) {
this.pos = pos + 1;
return Token.GREATERTHAN_EQUALS;
}
}
this.pos = pos;
return Token.GREATERTHAN;
}
case CharCode.QUESTION: {
this.pos = pos + 1;
return Token.QUESTION;
}
case CharCode.OPENBRACKET: {
this.pos = pos + 1;
return Token.OPENBRACKET;
}
case CharCode.CLOSEBRACKET: {
this.pos = pos + 1;
return Token.CLOSEBRACKET;
}
case CharCode.CARET: {
++pos;
if (
maxTokenLength > 1 && pos < end &&
text.charCodeAt(pos) == CharCode.EQUALS
) {
this.pos = pos + 1;
return Token.CARET_EQUALS;
}
this.pos = pos;
return Token.CARET;
}
case CharCode.OPENBRACE: {
this.pos = pos + 1;
return Token.OPENBRACE;
}
case CharCode.BAR: {
++pos;
if (maxTokenLength > 1 && pos < end) {
let chr = text.charCodeAt(pos);
if (chr == CharCode.BAR) {
this.pos = pos + 1;
return Token.BAR_BAR;
}
if (chr == CharCode.EQUALS) {
this.pos = pos + 1;
return Token.BAR_EQUALS;
}
}
this.pos = pos;
return Token.BAR;
}
case CharCode.CLOSEBRACE: {
this.pos = pos + 1;
return Token.CLOSEBRACE;
}
case CharCode.TILDE: {
this.pos = pos + 1;
return Token.TILDE;
}
case CharCode.AT: {
this.pos = pos + 1;
return Token.AT;
}
default: {
if (isIdentifierStart(c)) {
if (isKeywordCharacter(c)) {
let posBefore = pos;
while (
++pos < end &&
isIdentifierPart(c = text.charCodeAt(pos))
) {
if (!isKeywordCharacter(c)) {
this.pos = posBefore;
return Token.IDENTIFIER;
}
}
let keywordText = text.substring(posBefore, pos);
let keywordToken = tokenFromKeyword(keywordText);
if (
keywordToken !== Token.INVALID &&
identifierHandling !== IdentifierHandling.ALWAYS &&
!(
identifierHandling === IdentifierHandling.PREFER &&
tokenIsAlsoIdentifier(keywordToken)
)
) {
this.pos = pos;
return keywordToken;
}
this.pos = pos = posBefore;
}
this.pos = pos;
return Token.IDENTIFIER; // expects a call to readIdentifier
} else if (isWhiteSpace(c)) {
++pos;
break;
}
let start = pos++;
if ( // surrogate pair?
(c & 0xFC00) == 0xD800 && pos < end &&
((text.charCodeAt(pos)) & 0xFC00) == 0xDC00
) ++pos;
this.error(
DiagnosticCode.Invalid_character,
this.range(start, pos)
);
this.pos = pos;
return Token.INVALID;
}
}
}
this.pos = pos;
return Token.ENDOFFILE;
}
peek(
checkOnNewLine: bool = false,
identifierHandling: IdentifierHandling = IdentifierHandling.DEFAULT,
maxCompoundLength: i32 = i32.MAX_VALUE
): Token {
var text = this.source.text;
if (this.nextToken < 0) {
let posBefore = this.pos;
let tokenBefore = this.token;
let tokenPosBefore = this.tokenPos;
let nextToken: Token;
do nextToken = this.unsafeNext(identifierHandling, maxCompoundLength);
while (nextToken == Token.INVALID);
this.nextToken = nextToken;
this.nextTokenPos = this.tokenPos;
if (checkOnNewLine) {
this.nextTokenOnNewLine = false;
for (let pos = posBefore, end = this.nextTokenPos; pos < end; ++pos) {
if (isLineBreak(text.charCodeAt(pos))) {
this.nextTokenOnNewLine = true;
break;
}
}
}
this.pos = posBefore;
this.token = tokenBefore;
this.tokenPos = tokenPosBefore;
}
return this.nextToken;
}
skipIdentifier(identifierHandling: IdentifierHandling = IdentifierHandling.PREFER): bool {
return this.skip(Token.IDENTIFIER, identifierHandling);
}
skip(token: Token, identifierHandling: IdentifierHandling = IdentifierHandling.DEFAULT): bool {
var posBefore = this.pos;
var tokenBefore = this.token;
var tokenPosBefore = this.tokenPos;
var maxCompoundLength = i32.MAX_VALUE;
if (token == Token.GREATERTHAN) { // where parsing type arguments
maxCompoundLength = 1;