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parse.js
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parse.js
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/***********************************************************************
A JavaScript tokenizer / parser / beautifier / compressor.
https://github.com/mishoo/UglifyJS2
-------------------------------- (C) ---------------------------------
Author: Mihai Bazon
<mihai.bazon@gmail.com>
http://mihai.bazon.net/blog
Distributed under the BSD license:
Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>
Parser based on parse-js (http://marijn.haverbeke.nl/parse-js/).
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above
copyright notice, this list of conditions and the following
disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials
provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
***********************************************************************/
"use strict";
import {
characters,
defaults,
makePredicate,
set_annotation,
} from "./utils/index.js";
import {
AST_Accessor,
AST_Array,
AST_Arrow,
AST_Assign,
AST_Await,
AST_BigInt,
AST_Binary,
AST_BlockStatement,
AST_Break,
AST_Call,
AST_Case,
AST_Catch,
AST_Chain,
AST_ClassExpression,
AST_ClassPrivateProperty,
AST_ClassProperty,
AST_ClassStaticBlock,
AST_ConciseMethod,
AST_PrivateGetter,
AST_PrivateMethod,
AST_PrivateSetter,
AST_Conditional,
AST_Const,
AST_Continue,
AST_Debugger,
AST_Default,
AST_DefaultAssign,
AST_DefClass,
AST_Definitions,
AST_Defun,
AST_Destructuring,
AST_Directive,
AST_Do,
AST_Dot,
AST_DotHash,
AST_EmptyStatement,
AST_Expansion,
AST_Export,
AST_False,
AST_Finally,
AST_For,
AST_ForIn,
AST_ForOf,
AST_Function,
AST_Hole,
AST_If,
AST_Import,
AST_ImportMeta,
AST_IterationStatement,
AST_Label,
AST_LabeledStatement,
AST_LabelRef,
AST_Let,
AST_NameMapping,
AST_New,
AST_NewTarget,
AST_Node,
AST_Null,
AST_Number,
AST_Object,
AST_ObjectGetter,
AST_ObjectKeyVal,
AST_ObjectProperty,
AST_ObjectSetter,
AST_PrefixedTemplateString,
AST_PropAccess,
AST_RegExp,
AST_Return,
AST_Sequence,
AST_SimpleStatement,
AST_String,
AST_Sub,
AST_Super,
AST_Switch,
AST_SymbolCatch,
AST_SymbolClass,
AST_SymbolClassProperty,
AST_SymbolConst,
AST_SymbolDeclaration,
AST_SymbolDefClass,
AST_SymbolDefun,
AST_SymbolExport,
AST_SymbolExportForeign,
AST_SymbolFunarg,
AST_SymbolImport,
AST_SymbolImportForeign,
AST_SymbolLambda,
AST_SymbolLet,
AST_SymbolMethod,
AST_SymbolRef,
AST_SymbolVar,
AST_TemplateSegment,
AST_TemplateString,
AST_This,
AST_Throw,
AST_Token,
AST_Toplevel,
AST_True,
AST_Try,
AST_UnaryPostfix,
AST_UnaryPrefix,
AST_Var,
AST_VarDef,
AST_While,
AST_With,
AST_Yield,
_INLINE,
_NOINLINE,
_PURE
} from "./ast.js";
var LATEST_RAW = ""; // Only used for numbers and template strings
var TEMPLATE_RAWS = new Map(); // Raw template strings
var KEYWORDS = "break case catch class const continue debugger default delete do else export extends finally for function if in instanceof let new return switch throw try typeof var void while with";
var KEYWORDS_ATOM = "false null true";
var RESERVED_WORDS = "enum import super this " + KEYWORDS_ATOM + " " + KEYWORDS;
var ALL_RESERVED_WORDS = "implements interface package private protected public static " + RESERVED_WORDS;
var KEYWORDS_BEFORE_EXPRESSION = "return new delete throw else case yield await";
KEYWORDS = makePredicate(KEYWORDS);
RESERVED_WORDS = makePredicate(RESERVED_WORDS);
KEYWORDS_BEFORE_EXPRESSION = makePredicate(KEYWORDS_BEFORE_EXPRESSION);
KEYWORDS_ATOM = makePredicate(KEYWORDS_ATOM);
ALL_RESERVED_WORDS = makePredicate(ALL_RESERVED_WORDS);
var OPERATOR_CHARS = makePredicate(characters("+-*&%=<>!?|~^"));
var RE_NUM_LITERAL = /[0-9a-f]/i;
var RE_HEX_NUMBER = /^0x[0-9a-f]+$/i;
var RE_OCT_NUMBER = /^0[0-7]+$/;
var RE_ES6_OCT_NUMBER = /^0o[0-7]+$/i;
var RE_BIN_NUMBER = /^0b[01]+$/i;
var RE_DEC_NUMBER = /^\d*\.?\d*(?:e[+-]?\d*(?:\d\.?|\.?\d)\d*)?$/i;
var RE_BIG_INT = /^(0[xob])?[0-9a-f]+n$/i;
var OPERATORS = makePredicate([
"in",
"instanceof",
"typeof",
"new",
"void",
"delete",
"++",
"--",
"+",
"-",
"!",
"~",
"&",
"|",
"^",
"*",
"**",
"/",
"%",
">>",
"<<",
">>>",
"<",
">",
"<=",
">=",
"==",
"===",
"!=",
"!==",
"?",
"=",
"+=",
"-=",
"||=",
"&&=",
"??=",
"/=",
"*=",
"**=",
"%=",
">>=",
"<<=",
">>>=",
"|=",
"^=",
"&=",
"&&",
"??",
"||",
]);
var WHITESPACE_CHARS = makePredicate(characters(" \u00a0\n\r\t\f\u000b\u200b\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u2028\u2029\u202f\u205f\u3000\uFEFF"));
var NEWLINE_CHARS = makePredicate(characters("\n\r\u2028\u2029"));
var PUNC_AFTER_EXPRESSION = makePredicate(characters(";]),:"));
var PUNC_BEFORE_EXPRESSION = makePredicate(characters("[{(,;:"));
var PUNC_CHARS = makePredicate(characters("[]{}(),;:"));
/* -----[ Tokenizer ]----- */
// surrogate safe regexps adapted from https://github.com/mathiasbynens/unicode-8.0.0/tree/89b412d8a71ecca9ed593d9e9fa073ab64acfebe/Binary_Property
var UNICODE = {
ID_Start: 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ID_Continue: 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2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC]|\uD800[\uDC00-\uDC0B\uDC0D-\uDC26\uDC28-\uDC3A\uDC3C\uDC3D\uDC3F-\uDC4D\uDC50-\uDC5D\uDC80-\uDCFA\uDD40-\uDD74\uDDFD\uDE80-\uDE9C\uDEA0-\uDED0\uDEE0\uDF00-\uDF1F\uDF30-\uDF4A\uDF50-\uDF7A\uDF80-\uDF9D\uDFA0-\uDFC3\uDFC8-\uDFCF\uDFD1-\uDFD5]|\uD801[\uDC00-\uDC9D\uDCA0-\uDCA9\uDD00-\uDD27\uDD30-\uDD63\uDE00-\uDF36\uDF40-\uDF55\uDF60-\uDF67]|\uD802[\uDC00-\uDC05\uDC08\uDC0A-\uDC35\uDC37\uDC38\uDC3C\uDC3F-\uDC55\uDC60-\uDC76\uDC80-\uDC9E\uDCE0-\uDCF2\uDCF4\uDCF5\uDD00-\uDD15\uDD20-\uDD39\uDD80-\uDDB7\uDDBE\uDDBF\uDE00-\uDE03\uDE05\uDE06\uDE0C-\uDE13\uDE15-\uDE17\uDE19-\uDE33\uDE38-\uDE3A\uDE3F\uDE60-\uDE7C\uDE80-\uDE9C\uDEC0-\uDEC7\uDEC9-\uDEE6\uDF00-\uDF35\uDF40-\uDF55\uDF60-\uDF72\uDF80-\uDF91]|\uD803[\uDC00-\uDC48\uDC80-\uDCB2\uDCC0-\uDCF2]|\uD804[\uDC00-\uDC46\uDC66-\uDC6F\uDC7F-\uDCBA\uDCD0-\uDCE8\uDCF0-\uDCF9\uDD00-\uDD34\uDD36-\uDD3F\uDD50-\uDD73\uDD76\uDD80-\uDDC4\uDDCA-\uDDCC\uDDD0-\uDDDA\uDDDC\uDE00-\uDE11\uDE13-\uDE37\uDE80-\uDE86\uDE88\uDE8A-\uDE8D\uDE8F-\uDE9D\uDE9F-\uDEA8\uDEB0-\uDEEA\uDEF0-\uDEF9\uDF00-\uDF03\uDF05-\uDF0C\uDF0F\uDF10\uDF13-\uDF28\uDF2A-\uDF30\uDF32\uDF33\uDF35-\uDF39\uDF3C-\uDF44\uDF47\uDF48\uDF4B-\uDF4D\uDF50\uDF57\uDF5D-\uDF63\uDF66-\uDF6C\uDF70-\uDF74]|\uD805[\uDC80-\uDCC5\uDCC7\uDCD0-\uDCD9\uDD80-\uDDB5\uDDB8-\uDDC0\uDDD8-\uDDDD\uDE00-\uDE40\uDE44\uDE50-\uDE59\uDE80-\uDEB7\uDEC0-\uDEC9\uDF00-\uDF19\uDF1D-\uDF2B\uDF30-\uDF39]|\uD806[\uDCA0-\uDCE9\uDCFF\uDEC0-\uDEF8]|\uD808[\uDC00-\uDF99]|\uD809[\uDC00-\uDC6E\uDC80-\uDD43]|[\uD80C\uD840-\uD868\uD86A-\uD86C\uD86F-\uD872][\uDC00-\uDFFF]|\uD80D[\uDC00-\uDC2E]|\uD811[\uDC00-\uDE46]|\uD81A[\uDC00-\uDE38\uDE40-\uDE5E\uDE60-\uDE69\uDED0-\uDEED\uDEF0-\uDEF4\uDF00-\uDF36\uDF40-\uDF43\uDF50-\uDF59\uDF63-\uDF77\uDF7D-\uDF8F]|\uD81B[\uDF00-\uDF44\uDF50-\uDF7E\uDF8F-\uDF9F]|\uD82C[\uDC00\uDC01]|\uD82F[\uDC00-\uDC6A\uDC70-\uDC7C\uDC80-\uDC88\uDC90-\uDC99\uDC9D\uDC9E]|\uD834[\uDD65-\uDD69\uDD6D-\uDD72\uDD7B-\uDD82\uDD85-\uDD8B\uDDAA-\uDDAD\uDE42-\uDE44]|\uD835[\uDC00-\uDC54\uDC56-\uDC9C\uDC9E\uDC9F\uDCA2\uDCA5\uDCA6\uDCA9-\uDCAC\uDCAE-\uDCB9\uDCBB\uDCBD-\uDCC3\uDCC5-\uDD05\uDD07-\uDD0A\uDD0D-\uDD14\uDD16-\uDD1C\uDD1E-\uDD39\uDD3B-\uDD3E\uDD40-\uDD44\uDD46\uDD4A-\uDD50\uDD52-\uDEA5\uDEA8-\uDEC0\uDEC2-\uDEDA\uDEDC-\uDEFA\uDEFC-\uDF14\uDF16-\uDF34\uDF36-\uDF4E\uDF50-\uDF6E\uDF70-\uDF88\uDF8A-\uDFA8\uDFAA-\uDFC2\uDFC4-\uDFCB\uDFCE-\uDFFF]|\uD836[\uDE00-\uDE36\uDE3B-\uDE6C\uDE75\uDE84\uDE9B-\uDE9F\uDEA1-\uDEAF]|\uD83A[\uDC00-\uDCC4\uDCD0-\uDCD6]|\uD83B[\uDE00-\uDE03\uDE05-\uDE1F\uDE21\uDE22\uDE24\uDE27\uDE29-\uDE32\uDE34-\uDE37\uDE39\uDE3B\uDE42\uDE47\uDE49\uDE4B\uDE4D-\uDE4F\uDE51\uDE52\uDE54\uDE57\uDE59\uDE5B\uDE5D\uDE5F\uDE61\uDE62\uDE64\uDE67-\uDE6A\uDE6C-\uDE72\uDE74-\uDE77\uDE79-\uDE7C\uDE7E\uDE80-\uDE89\uDE8B-\uDE9B\uDEA1-\uDEA3\uDEA5-\uDEA9\uDEAB-\uDEBB]|\uD869[\uDC00-\uDED6\uDF00-\uDFFF]|\uD86D[\uDC00-\uDF34\uDF40-\uDFFF]|\uD86E[\uDC00-\uDC1D\uDC20-\uDFFF]|\uD873[\uDC00-\uDEA1]|\uD87E[\uDC00-\uDE1D]|\uDB40[\uDD00-\uDDEF])+/,
};
function get_full_char(str, pos) {
if (is_surrogate_pair_head(str.charCodeAt(pos))) {
if (is_surrogate_pair_tail(str.charCodeAt(pos + 1))) {
return str.charAt(pos) + str.charAt(pos + 1);
}
} else if (is_surrogate_pair_tail(str.charCodeAt(pos))) {
if (is_surrogate_pair_head(str.charCodeAt(pos - 1))) {
return str.charAt(pos - 1) + str.charAt(pos);
}
}
return str.charAt(pos);
}
function get_full_char_code(str, pos) {
// https://en.wikipedia.org/wiki/Universal_Character_Set_characters#Surrogates
if (is_surrogate_pair_head(str.charCodeAt(pos))) {
return 0x10000 + (str.charCodeAt(pos) - 0xd800 << 10) + str.charCodeAt(pos + 1) - 0xdc00;
}
return str.charCodeAt(pos);
}
function get_full_char_length(str) {
var surrogates = 0;
for (var i = 0; i < str.length; i++) {
if (is_surrogate_pair_head(str.charCodeAt(i)) && is_surrogate_pair_tail(str.charCodeAt(i + 1))) {
surrogates++;
i++;
}
}
return str.length - surrogates;
}
function from_char_code(code) {
// Based on https://github.com/mathiasbynens/String.fromCodePoint/blob/master/fromcodepoint.js
if (code > 0xFFFF) {
code -= 0x10000;
return (String.fromCharCode((code >> 10) + 0xD800) +
String.fromCharCode((code % 0x400) + 0xDC00));
}
return String.fromCharCode(code);
}
function is_surrogate_pair_head(code) {
return code >= 0xd800 && code <= 0xdbff;
}
function is_surrogate_pair_tail(code) {
return code >= 0xdc00 && code <= 0xdfff;
}
function is_digit(code) {
return code >= 48 && code <= 57;
}
function is_identifier_start(ch) {
return UNICODE.ID_Start.test(ch);
}
function is_identifier_char(ch) {
return UNICODE.ID_Continue.test(ch);
}
const BASIC_IDENT = /^[a-z_$][a-z0-9_$]*$/i;
function is_basic_identifier_string(str) {
return BASIC_IDENT.test(str);
}
function is_identifier_string(str, allow_surrogates) {
if (BASIC_IDENT.test(str)) {
return true;
}
if (!allow_surrogates && /[\ud800-\udfff]/.test(str)) {
return false;
}
var match = UNICODE.ID_Start.exec(str);
if (!match || match.index !== 0) {
return false;
}
str = str.slice(match[0].length);
if (!str) {
return true;
}
match = UNICODE.ID_Continue.exec(str);
return !!match && match[0].length === str.length;
}
function parse_js_number(num, allow_e = true) {
if (!allow_e && num.includes("e")) {
return NaN;
}
if (RE_HEX_NUMBER.test(num)) {
return parseInt(num.substr(2), 16);
} else if (RE_OCT_NUMBER.test(num)) {
return parseInt(num.substr(1), 8);
} else if (RE_ES6_OCT_NUMBER.test(num)) {
return parseInt(num.substr(2), 8);
} else if (RE_BIN_NUMBER.test(num)) {
return parseInt(num.substr(2), 2);
} else if (RE_DEC_NUMBER.test(num)) {
return parseFloat(num);
} else {
var val = parseFloat(num);
if (val == num) return val;
}
}
class JS_Parse_Error extends Error {
constructor(message, filename, line, col, pos) {
super();
this.name = "SyntaxError";
this.message = message;
this.filename = filename;
this.line = line;
this.col = col;
this.pos = pos;
}
}
function js_error(message, filename, line, col, pos) {
throw new JS_Parse_Error(message, filename, line, col, pos);
}
function is_token(token, type, val) {
return token.type == type && (val == null || token.value == val);
}
var EX_EOF = {};
function tokenizer($TEXT, filename, html5_comments, shebang) {
var S = {
text : $TEXT,
filename : filename,
pos : 0,
tokpos : 0,
line : 1,
tokline : 0,
col : 0,
tokcol : 0,
newline_before : false,
regex_allowed : false,
brace_counter : 0,
template_braces : [],
comments_before : [],
directives : {},
directive_stack : []
};
function peek() { return get_full_char(S.text, S.pos); }
// Used because parsing ?. involves a lookahead for a digit
function is_option_chain_op() {
const must_be_dot = S.text.charCodeAt(S.pos + 1) === 46;
if (!must_be_dot) return false;
const cannot_be_digit = S.text.charCodeAt(S.pos + 2);
return cannot_be_digit < 48 || cannot_be_digit > 57;
}
function next(signal_eof, in_string) {
var ch = get_full_char(S.text, S.pos++);
if (signal_eof && !ch)
throw EX_EOF;
if (NEWLINE_CHARS.has(ch)) {
S.newline_before = S.newline_before || !in_string;
++S.line;
S.col = 0;
if (ch == "\r" && peek() == "\n") {
// treat a \r\n sequence as a single \n
++S.pos;
ch = "\n";
}
} else {
if (ch.length > 1) {
++S.pos;
++S.col;
}
++S.col;
}
return ch;
}
function forward(i) {
while (i--) next();
}
function looking_at(str) {
return S.text.substr(S.pos, str.length) == str;
}
function find_eol() {
var text = S.text;
for (var i = S.pos, n = S.text.length; i < n; ++i) {
var ch = text[i];
if (NEWLINE_CHARS.has(ch))
return i;
}
return -1;
}
function find(what, signal_eof) {
var pos = S.text.indexOf(what, S.pos);
if (signal_eof && pos == -1) throw EX_EOF;
return pos;
}
function start_token() {
S.tokline = S.line;
S.tokcol = S.col;
S.tokpos = S.pos;
}
var prev_was_dot = false;
var previous_token = null;
function token(type, value, is_comment) {
S.regex_allowed = ((type == "operator" && !UNARY_POSTFIX.has(value)) ||
(type == "keyword" && KEYWORDS_BEFORE_EXPRESSION.has(value)) ||
(type == "punc" && PUNC_BEFORE_EXPRESSION.has(value))) ||
(type == "arrow");
if (type == "punc" && (value == "." || value == "?.")) {
prev_was_dot = true;
} else if (!is_comment) {
prev_was_dot = false;
}
const line = S.tokline;
const col = S.tokcol;
const pos = S.tokpos;
const nlb = S.newline_before;
const file = filename;
let comments_before = [];
let comments_after = [];
if (!is_comment) {
comments_before = S.comments_before;
comments_after = S.comments_before = [];
}
S.newline_before = false;
const tok = new AST_Token(type, value, line, col, pos, nlb, comments_before, comments_after, file);
if (!is_comment) previous_token = tok;
return tok;
}
function skip_whitespace() {
while (WHITESPACE_CHARS.has(peek()))
next();
}
function read_while(pred) {
var ret = "", ch, i = 0;
while ((ch = peek()) && pred(ch, i++))
ret += next();
return ret;
}
function parse_error(err) {
js_error(err, filename, S.tokline, S.tokcol, S.tokpos);
}
function read_num(prefix) {
var has_e = false, after_e = false, has_x = false, has_dot = prefix == ".", is_big_int = false, numeric_separator = false;
var num = read_while(function(ch, i) {
if (is_big_int) return false;
var code = ch.charCodeAt(0);
switch (code) {
case 95: // _
return (numeric_separator = true);
case 98: case 66: // bB
return (has_x = true); // Can occur in hex sequence, don't return false yet
case 111: case 79: // oO
case 120: case 88: // xX
return has_x ? false : (has_x = true);
case 101: case 69: // eE
return has_x ? true : has_e ? false : (has_e = after_e = true);
case 45: // -
return after_e || (i == 0 && !prefix);
case 43: // +
return after_e;
case (after_e = false, 46): // .
return (!has_dot && !has_x && !has_e) ? (has_dot = true) : false;
}
if (ch === "n") {
is_big_int = true;
return true;
}
return RE_NUM_LITERAL.test(ch);
});
if (prefix) num = prefix + num;
LATEST_RAW = num;
if (RE_OCT_NUMBER.test(num) && next_token.has_directive("use strict")) {
parse_error("Legacy octal literals are not allowed in strict mode");
}
if (numeric_separator) {
if (num.endsWith("_")) {
parse_error("Numeric separators are not allowed at the end of numeric literals");
} else if (num.includes("__")) {
parse_error("Only one underscore is allowed as numeric separator");
}
num = num.replace(/_/g, "");
}
if (num.endsWith("n")) {
const without_n = num.slice(0, -1);
const allow_e = RE_HEX_NUMBER.test(without_n);
const valid = parse_js_number(without_n, allow_e);
if (!has_dot && RE_BIG_INT.test(num) && !isNaN(valid))
return token("big_int", without_n);
parse_error("Invalid or unexpected token");
}
var valid = parse_js_number(num);
if (!isNaN(valid)) {
return token("num", valid);
} else {
parse_error("Invalid syntax: " + num);
}
}
function is_octal(ch) {
return ch >= "0" && ch <= "7";
}
function read_escaped_char(in_string, strict_hex, template_string) {
var ch = next(true, in_string);
switch (ch.charCodeAt(0)) {
case 110 : return "\n";
case 114 : return "\r";
case 116 : return "\t";
case 98 : return "\b";
case 118 : return "\u000b"; // \v
case 102 : return "\f";
case 120 : return String.fromCharCode(hex_bytes(2, strict_hex)); // \x
case 117 : // \u
if (peek() == "{") {
next(true);
if (peek() === "}")
parse_error("Expecting hex-character between {}");
while (peek() == "0") next(true); // No significance
var result, length = find("}", true) - S.pos;
// Avoid 32 bit integer overflow (1 << 32 === 1)
// We know first character isn't 0 and thus out of range anyway
if (length > 6 || (result = hex_bytes(length, strict_hex)) > 0x10FFFF) {
parse_error("Unicode reference out of bounds");
}
next(true);
return from_char_code(result);
}
return String.fromCharCode(hex_bytes(4, strict_hex));
case 10 : return ""; // newline
case 13 : // \r
if (peek() == "\n") { // DOS newline
next(true, in_string);
return "";
}
}
if (is_octal(ch)) {
if (template_string && strict_hex) {
const represents_null_character = ch === "0" && !is_octal(peek());
if (!represents_null_character) {
parse_error("Octal escape sequences are not allowed in template strings");
}
}
return read_octal_escape_sequence(ch, strict_hex);
}
return ch;
}
function read_octal_escape_sequence(ch, strict_octal) {
// Read
var p = peek();
if (p >= "0" && p <= "7") {
ch += next(true);
if (ch[0] <= "3" && (p = peek()) >= "0" && p <= "7")
ch += next(true);
}
// Parse
if (ch === "0") return "\0";
if (ch.length > 0 && next_token.has_directive("use strict") && strict_octal)
parse_error("Legacy octal escape sequences are not allowed in strict mode");
return String.fromCharCode(parseInt(ch, 8));
}
function hex_bytes(n, strict_hex) {
var num = 0;
for (; n > 0; --n) {
if (!strict_hex && isNaN(parseInt(peek(), 16))) {
return parseInt(num, 16) || "";
}
var digit = next(true);
if (isNaN(parseInt(digit, 16)))
parse_error("Invalid hex-character pattern in string");
num += digit;
}
return parseInt(num, 16);
}
var read_string = with_eof_error("Unterminated string constant", function() {
const start_pos = S.pos;
var quote = next(), ret = [];
for (;;) {
var ch = next(true, true);
if (ch == "\\") ch = read_escaped_char(true, true);
else if (ch == "\r" || ch == "\n") parse_error("Unterminated string constant");
else if (ch == quote) break;
ret.push(ch);
}
var tok = token("string", ret.join(""));
LATEST_RAW = S.text.slice(start_pos, S.pos);
tok.quote = quote;
return tok;
});
var read_template_characters = with_eof_error("Unterminated template", function(begin) {
if (begin) {
S.template_braces.push(S.brace_counter);
}
var content = "", raw = "", ch, tok;
next(true, true);
while ((ch = next(true, true)) != "`") {
if (ch == "\r") {
if (peek() == "\n") ++S.pos;
ch = "\n";
} else if (ch == "$" && peek() == "{") {
next(true, true);
S.brace_counter++;
tok = token(begin ? "template_head" : "template_substitution", content);
TEMPLATE_RAWS.set(tok, raw);
tok.template_end = false;
return tok;
}
raw += ch;
if (ch == "\\") {
var tmp = S.pos;
var prev_is_tag = previous_token && (previous_token.type === "name" || previous_token.type === "punc" && (previous_token.value === ")" || previous_token.value === "]"));
ch = read_escaped_char(true, !prev_is_tag, true);
raw += S.text.substr(tmp, S.pos - tmp);
}
content += ch;
}
S.template_braces.pop();
tok = token(begin ? "template_head" : "template_substitution", content);
TEMPLATE_RAWS.set(tok, raw);
tok.template_end = true;
return tok;
});
function skip_line_comment(type) {
var regex_allowed = S.regex_allowed;
var i = find_eol(), ret;
if (i == -1) {
ret = S.text.substr(S.pos);
S.pos = S.text.length;
} else {
ret = S.text.substring(S.pos, i);
S.pos = i;
}
S.col = S.tokcol + (S.pos - S.tokpos);
S.comments_before.push(token(type, ret, true));
S.regex_allowed = regex_allowed;
return next_token;
}
var skip_multiline_comment = with_eof_error("Unterminated multiline comment", function() {
var regex_allowed = S.regex_allowed;
var i = find("*/", true);
var text = S.text.substring(S.pos, i).replace(/\r\n|\r|\u2028|\u2029/g, "\n");
// update stream position
forward(get_full_char_length(text) /* text length doesn't count \r\n as 2 char while S.pos - i does */ + 2);
S.comments_before.push(token("comment2", text, true));
S.newline_before = S.newline_before || text.includes("\n");
S.regex_allowed = regex_allowed;
return next_token;
});
var read_name = with_eof_error("Unterminated identifier name", function() {
var name = [], ch, escaped = false;
var read_escaped_identifier_char = function() {
escaped = true;
next();
if (peek() !== "u") {
parse_error("Expecting UnicodeEscapeSequence -- uXXXX or u{XXXX}");
}
return read_escaped_char(false, true);
};
// Read first character (ID_Start)
if ((ch = peek()) === "\\") {
ch = read_escaped_identifier_char();
if (!is_identifier_start(ch)) {
parse_error("First identifier char is an invalid identifier char");
}
} else if (is_identifier_start(ch)) {
next();
} else {
return "";
}
name.push(ch);
// Read ID_Continue
while ((ch = peek()) != null) {
if ((ch = peek()) === "\\") {
ch = read_escaped_identifier_char();
if (!is_identifier_char(ch)) {
parse_error("Invalid escaped identifier char");
}
} else {
if (!is_identifier_char(ch)) {
break;
}
next();
}
name.push(ch);
}
const name_str = name.join("");
if (RESERVED_WORDS.has(name_str) && escaped) {
parse_error("Escaped characters are not allowed in keywords");
}
return name_str;
});
var read_regexp = with_eof_error("Unterminated regular expression", function(source) {
var prev_backslash = false, ch, in_class = false;
while ((ch = next(true))) if (NEWLINE_CHARS.has(ch)) {
parse_error("Unexpected line terminator");
} else if (prev_backslash) {
source += "\\" + ch;
prev_backslash = false;
} else if (ch == "[") {
in_class = true;
source += ch;
} else if (ch == "]" && in_class) {
in_class = false;
source += ch;
} else if (ch == "/" && !in_class) {
break;
} else if (ch == "\\") {
prev_backslash = true;
} else {
source += ch;
}
const flags = read_name();
return token("regexp", "/" + source + "/" + flags);
});
function read_operator(prefix) {
function grow(op) {
if (!peek()) return op;
var bigger = op + peek();
if (OPERATORS.has(bigger)) {
next();
return grow(bigger);
} else {
return op;
}
}
return token("operator", grow(prefix || next()));
}
function handle_slash() {
next();
switch (peek()) {
case "/":
next();
return skip_line_comment("comment1");
case "*":
next();
return skip_multiline_comment();
}
return S.regex_allowed ? read_regexp("") : read_operator("/");
}
function handle_eq_sign() {
next();
if (peek() === ">") {
next();
return token("arrow", "=>");
} else {
return read_operator("=");
}
}
function handle_dot() {
next();
if (is_digit(peek().charCodeAt(0))) {
return read_num(".");
}
if (peek() === ".") {
next(); // Consume second dot
next(); // Consume third dot
return token("expand", "...");
}
return token("punc", ".");
}
function read_word() {
var word = read_name();
if (prev_was_dot) return token("name", word);
return KEYWORDS_ATOM.has(word) ? token("atom", word)
: !KEYWORDS.has(word) ? token("name", word)
: OPERATORS.has(word) ? token("operator", word)
: token("keyword", word);
}
function read_private_word() {
next();
return token("privatename", read_name());
}
function with_eof_error(eof_error, cont) {
return function(x) {
try {
return cont(x);
} catch(ex) {
if (ex === EX_EOF) parse_error(eof_error);
else throw ex;
}
};
}
function next_token(force_regexp) {
if (force_regexp != null)
return read_regexp(force_regexp);
if (shebang && S.pos == 0 && looking_at("#!")) {
start_token();
forward(2);
skip_line_comment("comment5");
}
for (;;) {
skip_whitespace();
start_token();
if (html5_comments) {
if (looking_at("<!--")) {
forward(4);
skip_line_comment("comment3");
continue;
}
if (looking_at("-->") && S.newline_before) {
forward(3);
skip_line_comment("comment4");
continue;
}
}
var ch = peek();
if (!ch) return token("eof");
var code = ch.charCodeAt(0);
switch (code) {
case 34: case 39: return read_string();
case 46: return handle_dot();
case 47: {
var tok = handle_slash();
if (tok === next_token) continue;
return tok;
}
case 61: return handle_eq_sign();
case 63: {
if (!is_option_chain_op()) break; // Handled below
next(); // ?
next(); // .
return token("punc", "?.");
}
case 96: return read_template_characters(true);
case 123:
S.brace_counter++;
break;
case 125:
S.brace_counter--;
if (S.template_braces.length > 0
&& S.template_braces[S.template_braces.length - 1] === S.brace_counter)
return read_template_characters(false);
break;
}
if (is_digit(code)) return read_num();
if (PUNC_CHARS.has(ch)) return token("punc", next());
if (OPERATOR_CHARS.has(ch)) return read_operator();
if (code == 92 || is_identifier_start(ch)) return read_word();
if (code == 35) return read_private_word();
break;
}
parse_error("Unexpected character '" + ch + "'");
}
next_token.next = next;
next_token.peek = peek;
next_token.context = function(nc) {
if (nc) S = nc;
return S;
};
next_token.add_directive = function(directive) {
S.directive_stack[S.directive_stack.length - 1].push(directive);
if (S.directives[directive] === undefined) {
S.directives[directive] = 1;
} else {
S.directives[directive]++;
}
};
next_token.push_directives_stack = function() {
S.directive_stack.push([]);
};
next_token.pop_directives_stack = function() {
var directives = S.directive_stack[S.directive_stack.length - 1];
for (var i = 0; i < directives.length; i++) {
S.directives[directives[i]]--;
}
S.directive_stack.pop();
};
next_token.has_directive = function(directive) {
return S.directives[directive] > 0;
};
return next_token;
}
/* -----[ Parser (constants) ]----- */
var UNARY_PREFIX = makePredicate([