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parse.js
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/***********************************************************************
A JavaScript tokenizer / parser / beautifier / compressor.
https://github.com/mishoo/UglifyJS
-------------------------------- (C) ---------------------------------
Author: Mihai Bazon
http://mihai.bazon.net/blog
Distributed under the BSD license:
Copyright 2012 (c) Mihai Bazon <[email protected]>
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";
var KEYWORDS = "break case catch class const continue debugger default delete do else extends finally for function if in instanceof new return switch throw try typeof var void while with";
var KEYWORDS_ATOM = "false null true";
var RESERVED_WORDS = [
"abstract async await boolean byte char double enum export final float goto implements import int interface let long native package private protected public short static super synchronized this throws transient volatile yield",
KEYWORDS_ATOM,
KEYWORDS,
].join(" ");
var KEYWORDS_BEFORE_EXPRESSION = "return new delete throw else case";
KEYWORDS = makePredicate(KEYWORDS);
RESERVED_WORDS = makePredicate(RESERVED_WORDS);
KEYWORDS_BEFORE_EXPRESSION = makePredicate(KEYWORDS_BEFORE_EXPRESSION);
KEYWORDS_ATOM = makePredicate(KEYWORDS_ATOM);
var RE_BIN_NUMBER = /^0b([01]+)$/i;
var RE_HEX_NUMBER = /^0x([0-9a-f]+)$/i;
var RE_OCT_NUMBER = /^0o?([0-7]+)$/i;
var OPERATORS = makePredicate([
"in",
"instanceof",
"typeof",
"new",
"void",
"delete",
"++",
"--",
"+",
"-",
"!",
"~",
"&",
"|",
"^",
"*",
"/",
"%",
"**",
">>",
"<<",
">>>",
"<",
">",
"<=",
">=",
"==",
"===",
"!=",
"!==",
"?",
"=",
"+=",
"-=",
"/=",
"*=",
"%=",
"**=",
">>=",
"<<=",
">>>=",
"&=",
"|=",
"^=",
"&&",
"||",
"??",
"&&=",
"||=",
"??=",
]);
var NEWLINE_CHARS = "\n\r\u2028\u2029";
var OPERATOR_CHARS = "+-*&%=<>!?|~^";
var PUNC_OPENERS = "[{(";
var PUNC_SEPARATORS = ",;:";
var PUNC_CLOSERS = ")}]";
var PUNC_AFTER_EXPRESSION = PUNC_SEPARATORS + PUNC_CLOSERS;
var PUNC_BEFORE_EXPRESSION = PUNC_OPENERS + PUNC_SEPARATORS;
var PUNC_CHARS = PUNC_BEFORE_EXPRESSION + "`" + PUNC_CLOSERS;
var WHITESPACE_CHARS = NEWLINE_CHARS + " \u00a0\t\f\u000b\u200b\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000\uFEFF";
var NON_IDENTIFIER_CHARS = makePredicate(characters("./'\"#" + OPERATOR_CHARS + PUNC_CHARS + WHITESPACE_CHARS));
NEWLINE_CHARS = makePredicate(characters(NEWLINE_CHARS));
OPERATOR_CHARS = makePredicate(characters(OPERATOR_CHARS));
PUNC_AFTER_EXPRESSION = makePredicate(characters(PUNC_AFTER_EXPRESSION));
PUNC_BEFORE_EXPRESSION = makePredicate(characters(PUNC_BEFORE_EXPRESSION));
PUNC_CHARS = makePredicate(characters(PUNC_CHARS));
WHITESPACE_CHARS = makePredicate(characters(WHITESPACE_CHARS));
/* -----[ Tokenizer ]----- */
function is_surrogate_pair_head(code) {
return code >= 0xd800 && code <= 0xdbff;
}
function is_surrogate_pair_tail(code) {
return code >= 0xdc00 && code <= 0xdfff;
}
function is_digit(code) {
return code >= 48 && code <= 57;
}
function is_identifier_char(ch) {
return !NON_IDENTIFIER_CHARS[ch];
}
function is_identifier_string(str) {
return /^[a-z_$][a-z0-9_$]*$/i.test(str);
}
function decode_escape_sequence(seq) {
switch (seq[0]) {
case "b": return "\b";
case "f": return "\f";
case "n": return "\n";
case "r": return "\r";
case "t": return "\t";
case "u":
var code;
if (seq[1] == "{" && seq.slice(-1) == "}") {
code = seq.slice(2, -1);
} else if (seq.length == 5) {
code = seq.slice(1);
} else {
return;
}
var num = parseInt(code, 16);
if (num < 0 || isNaN(num)) return;
if (num < 0x10000) return String.fromCharCode(num);
if (num > 0x10ffff) return;
return String.fromCharCode((num >> 10) + 0xd7c0) + String.fromCharCode((num & 0x03ff) + 0xdc00);
case "v": return "\u000b";
case "x":
if (seq.length != 3) return;
var num = parseInt(seq.slice(1), 16);
if (num < 0 || isNaN(num)) return;
return String.fromCharCode(num);
case "\r":
case "\n":
return "";
default:
if (seq == "0") return "\0";
if (seq[0] >= "0" && seq[0] <= "9") return;
return seq;
}
}
function parse_js_number(num) {
var match;
if (match = RE_BIN_NUMBER.exec(num)) return parseInt(match[1], 2);
if (match = RE_HEX_NUMBER.exec(num)) return parseInt(match[1], 16);
if (match = RE_OCT_NUMBER.exec(num)) return parseInt(match[1], 8);
var val = parseFloat(num);
if (val == num) return val;
}
function JS_Parse_Error(message, filename, line, col, pos) {
this.message = message;
this.filename = filename;
this.line = line;
this.col = col;
this.pos = pos;
try {
throw new SyntaxError(message, filename, line, col);
} catch (cause) {
configure_error_stack(this, cause);
}
}
JS_Parse_Error.prototype = Object.create(SyntaxError.prototype);
JS_Parse_Error.prototype.constructor = JS_Parse_Error;
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 : $TEXT,
filename : filename,
pos : 0,
tokpos : 0,
line : 1,
tokline : 0,
col : 0,
tokcol : 0,
newline_before : false,
regex_allowed : false,
comments_before : [],
directives : Object.create(null),
read_template : with_eof_error("Unterminated template literal", function(strings) {
var s = "";
for (;;) {
var ch = read();
switch (ch) {
case "\\":
ch += read();
break;
case "`":
strings.push(s);
return;
case "$":
if (peek() == "{") {
next();
strings.push(s);
S.regex_allowed = true;
return true;
}
}
s += ch;
}
function read() {
var ch = next(true, true);
return ch == "\r" ? "\n" : ch;
}
}),
};
var prev_was_dot = false;
function peek() {
return S.text.charAt(S.pos);
}
function next(signal_eof, in_string) {
var ch = S.text.charAt(S.pos++);
if (signal_eof && !ch)
throw EX_EOF;
if (NEWLINE_CHARS[ch]) {
S.col = 0;
S.line++;
if (!in_string) S.newline_before = true;
if (ch == "\r" && peek() == "\n") {
// treat `\r\n` as `\n`
S.pos++;
ch = "\n";
}
} else {
S.col++;
}
return ch;
}
function forward(i) {
while (i-- > 0) 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; i < S.text.length; ++i) {
if (NEWLINE_CHARS[text[i]]) 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;
}
function token(type, value, is_comment) {
S.regex_allowed = type == "operator" && !UNARY_POSTFIX[value]
|| type == "keyword" && KEYWORDS_BEFORE_EXPRESSION[value]
|| type == "punc" && PUNC_BEFORE_EXPRESSION[value];
if (type == "punc" && value == ".") prev_was_dot = true;
else if (!is_comment) prev_was_dot = false;
var ret = {
type : type,
value : value,
line : S.tokline,
col : S.tokcol,
pos : S.tokpos,
endline : S.line,
endcol : S.col,
endpos : S.pos,
nlb : S.newline_before,
file : filename
};
if (/^(?:num|string|regexp)$/i.test(type)) {
ret.raw = $TEXT.substring(ret.pos, ret.endpos);
}
if (!is_comment) {
ret.comments_before = S.comments_before;
ret.comments_after = S.comments_before = [];
}
S.newline_before = false;
return new AST_Token(ret);
}
function skip_whitespace() {
while (WHITESPACE_CHARS[peek()])
next();
}
function read_while(pred) {
var ret = "", ch;
while ((ch = peek()) && pred(ch, ret)) ret += next();
return ret;
}
function parse_error(err) {
js_error(err, filename, S.tokline, S.tokcol, S.tokpos);
}
function is_octal(num) {
return /^0[0-7_]+$/.test(num);
}
function read_num(prefix) {
var has_e = false, after_e = false, has_x = false, has_dot = prefix == ".";
var num = read_while(function(ch, str) {
switch (ch) {
case "x": case "X":
return has_x ? false : (has_x = true);
case "e": case "E":
return has_x ? true : has_e ? false : (has_e = after_e = true);
case "+": case "-":
return after_e;
case (after_e = false, "."):
return has_dot || has_e || has_x || is_octal(str) ? false : (has_dot = true);
}
return /[_0-9a-dfo]/i.test(ch);
});
if (prefix) num = prefix + num;
if (is_octal(num)) {
if (next_token.has_directive("use strict")) parse_error("Legacy octal literals are not allowed in strict mode");
} else {
num = num.replace(has_x ? /([1-9a-f]|.0)_(?=[0-9a-f])/gi : /([1-9]|.0)_(?=[0-9])/gi, "$1");
}
var valid = parse_js_number(num);
if (isNaN(valid)) parse_error("Invalid syntax: " + num);
if (has_dot || has_e || peek() != "n") return token("num", valid);
next();
return token("bigint", num.toLowerCase());
}
function read_escaped_char(in_string) {
var seq = next(true, in_string);
if (seq >= "0" && seq <= "7") return read_octal_escape_sequence(seq);
if (seq == "u") {
var ch = next(true, in_string);
seq += ch;
if (ch != "{") {
seq += next(true, in_string) + next(true, in_string) + next(true, in_string);
} else do {
ch = next(true, in_string);
seq += ch;
} while (ch != "}");
} else if (seq == "x") {
seq += next(true, in_string) + next(true, in_string);
}
var str = decode_escape_sequence(seq);
if (typeof str != "string") parse_error("Invalid escape sequence: \\" + seq);
return str;
}
function read_octal_escape_sequence(ch) {
// 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"))
parse_error("Legacy octal escape sequences are not allowed in strict mode");
return String.fromCharCode(parseInt(ch, 8));
}
var read_string = with_eof_error("Unterminated string constant", function(quote_char) {
var quote = next(), ret = "";
for (;;) {
var ch = next(true, true);
if (ch == "\\") ch = read_escaped_char(true);
else if (NEWLINE_CHARS[ch]) parse_error("Unterminated string constant");
else if (ch == quote) break;
ret += ch;
}
var tok = token("string", ret);
tok.quote = quote_char;
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(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.regex_allowed = regex_allowed;
return next_token;
});
function read_name() {
var backslash = false, ch, escaped = false, name = peek() == "#" ? next() : "";
while (ch = peek()) {
if (!backslash) {
if (ch == "\\") escaped = backslash = true, next();
else if (is_identifier_char(ch)) name += next();
else break;
} else {
if (ch != "u") parse_error("Expecting UnicodeEscapeSequence -- uXXXX");
ch = read_escaped_char();
if (!is_identifier_char(ch)) parse_error("Unicode char: " + ch.charCodeAt(0) + " is not valid in identifier");
name += ch;
backslash = false;
}
}
if (KEYWORDS[name] && escaped) {
var hex = name.charCodeAt(0).toString(16).toUpperCase();
name = "\\u" + "0000".substr(hex.length) + hex + name.slice(1);
}
return name;
}
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[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;
}
var mods = read_name();
try {
var regexp = new RegExp(source, mods);
regexp.raw_source = source;
return token("regexp", regexp);
} catch (e) {
parse_error(e.message);
}
});
function read_operator(prefix) {
function grow(op) {
if (!peek()) return op;
var bigger = op + peek();
if (OPERATORS[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_dot() {
next();
if (looking_at("..")) return token("operator", "." + next() + next());
return is_digit(peek().charCodeAt(0)) ? read_num(".") : token("punc", ".");
}
function read_word() {
var word = read_name();
if (prev_was_dot) return token("name", word);
return KEYWORDS_ATOM[word] ? token("atom", word)
: !KEYWORDS[word] ? token("name", word)
: OPERATORS[word] ? token("operator", word)
: token("keyword", word);
}
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(ch);
case 46: return handle_dot();
case 47:
var tok = handle_slash();
if (tok === next_token) continue;
return tok;
}
if (is_digit(code)) return read_num();
if (PUNC_CHARS[ch]) return token("punc", next());
if (looking_at("=>")) return token("punc", next() + next());
if (OPERATOR_CHARS[ch]) return read_operator();
if (code == 35 || code == 92 || !NON_IDENTIFIER_CHARS[ch]) return read_word();
break;
}
parse_error("Unexpected character '" + ch + "'");
}
next_token.context = function(nc) {
if (nc) S = nc;
return S;
};
next_token.add_directive = function(directive) {
S.directives[directive] = true;
}
next_token.push_directives_stack = function() {
S.directives = Object.create(S.directives);
}
next_token.pop_directives_stack = function() {
S.directives = Object.getPrototypeOf(S.directives);
}
next_token.has_directive = function(directive) {
return !!S.directives[directive];
}
return next_token;
}
/* -----[ Parser (constants) ]----- */
var UNARY_PREFIX = makePredicate("typeof void delete -- ++ ! ~ - +");
var UNARY_POSTFIX = makePredicate("-- ++");
var ASSIGNMENT = makePredicate("= += -= /= *= %= **= >>= <<= >>>= &= |= ^= &&= ||= ??=");
var PRECEDENCE = function(a, ret) {
for (var i = 0; i < a.length;) {
var b = a[i++];
for (var j = 0; j < b.length; j++) {
ret[b[j]] = i;
}
}
return ret;
}([
["??"],
["||"],
["&&"],
["|"],
["^"],
["&"],
["==", "===", "!=", "!=="],
["<", ">", "<=", ">=", "in", "instanceof"],
[">>", "<<", ">>>"],
["+", "-"],
["*", "/", "%"],
["**"],
], {});
var ATOMIC_START_TOKEN = makePredicate("atom bigint num regexp string");
/* -----[ Parser ]----- */
function parse($TEXT, options) {
options = defaults(options, {
bare_returns : false,
expression : false,
filename : null,
html5_comments : true,
module : false,
shebang : true,
strict : false,
toplevel : null,
}, true);
var S = {
input : typeof $TEXT == "string"
? tokenizer($TEXT, options.filename, options.html5_comments, options.shebang)
: $TEXT,
in_async : false,
in_directives : true,
in_funarg : -1,
in_function : 0,
in_generator : false,
in_loop : 0,
labels : [],
peeked : null,
prev : null,
token : null,
};
S.token = next();
function is(type, value) {
return is_token(S.token, type, value);
}
function peek() {
return S.peeked || (S.peeked = S.input());
}
function next() {
S.prev = S.token;
if (S.peeked) {
S.token = S.peeked;
S.peeked = null;
} else {
S.token = S.input();
}
S.in_directives = S.in_directives && (
S.token.type == "string" || is("punc", ";")
);
return S.token;
}
function prev() {
return S.prev;
}
function croak(msg, line, col, pos) {
var ctx = S.input.context();
js_error(msg,
ctx.filename,
line != null ? line : ctx.tokline,
col != null ? col : ctx.tokcol,
pos != null ? pos : ctx.tokpos);
}
function token_error(token, msg) {
croak(msg, token.line, token.col);
}
function token_to_string(type, value) {
return type + (value === undefined ? "" : " «" + value + "»");
}
function unexpected(token) {
if (token == null) token = S.token;
token_error(token, "Unexpected token: " + token_to_string(token.type, token.value));
}
function expect_token(type, val) {
if (is(type, val)) return next();
token_error(S.token, "Unexpected token: " + token_to_string(S.token.type, S.token.value) + ", expected: " + token_to_string(type, val));
}
function expect(punc) {
return expect_token("punc", punc);
}
function has_newline_before(token) {
return token.nlb || !all(token.comments_before, function(comment) {
return !comment.nlb;
});
}
function can_insert_semicolon() {
return !options.strict
&& (is("eof") || is("punc", "}") || has_newline_before(S.token));
}
function semicolon(optional) {
if (is("punc", ";")) next();
else if (!optional && !can_insert_semicolon()) expect(";");
}
function parenthesized() {
expect("(");
var exp = expression();
expect(")");
return exp;
}
function embed_tokens(parser) {
return function() {
var start = S.token;
var expr = parser.apply(null, arguments);
var end = prev();
expr.start = start;
expr.end = end;
return expr;
};
}
function handle_regexp() {
if (is("operator", "/") || is("operator", "/=")) {
S.peeked = null;
S.token = S.input(S.token.value.substr(1)); // force regexp
}
}
var statement = embed_tokens(function(toplevel) {
handle_regexp();
switch (S.token.type) {
case "string":
var dir = S.in_directives;
var body = expression();
if (dir) {
if (body instanceof AST_String) {
var value = body.start.raw.slice(1, -1);
S.input.add_directive(value);
body.value = value;
} else {
S.in_directives = dir = false;
}
}
semicolon();
return dir ? new AST_Directive(body) : new AST_SimpleStatement({ body: body });
case "num":
case "bigint":
case "regexp":
case "operator":
case "atom":
return simple_statement();
case "name":
switch (S.token.value) {
case "async":
if (is_token(peek(), "keyword", "function")) {
next();
next();
if (!is("operator", "*")) return function_(AST_AsyncDefun);
next();
return function_(AST_AsyncGeneratorDefun);
}
break;
case "await":
if (S.in_async) return simple_statement();
break;
case "export":
if (!toplevel && options.module !== "") unexpected();
next();
return export_();
case "import":
var token = peek();
if (token.type == "punc" && /^[(.]$/.test(token.value)) break;
if (!toplevel && options.module !== "") unexpected();
next();
return import_();
case "let":
if (is_vardefs()) {
next();
var node = let_();
semicolon();
return node;
}
break;
case "yield":
if (S.in_generator) return simple_statement();
break;
}
return is_token(peek(), "punc", ":")
? labeled_statement()
: simple_statement();
case "punc":
switch (S.token.value) {
case "{":
return new AST_BlockStatement({
start : S.token,
body : block_(),
end : prev()
});
case "[":
case "(":
case "`":
return simple_statement();
case ";":
S.in_directives = false;
next();
return new AST_EmptyStatement();
default:
unexpected();
}
case "keyword":
switch (S.token.value) {
case "break":
next();
return break_cont(AST_Break);
case "class":
next();
return class_(AST_DefClass);
case "const":
next();
var node = const_();
semicolon();
return node;
case "continue":
next();
return break_cont(AST_Continue);
case "debugger":
next();
semicolon();
return new AST_Debugger();
case "do":
next();
var body = in_loop(statement);
expect_token("keyword", "while");
var condition = parenthesized();
semicolon(true);
return new AST_Do({
body : body,
condition : condition,
});
case "while":
next();
return new AST_While({
condition : parenthesized(),
body : in_loop(statement),
});
case "for":
next();
return for_();
case "function":
next();
if (!is("operator", "*")) return function_(AST_Defun);
next();
return function_(AST_GeneratorDefun);
case "if":
next();
return if_();
case "return":
if (S.in_function == 0 && !options.bare_returns)
croak("'return' outside of function");
next();
var value = null;
if (is("punc", ";")) {
next();
} else if (!can_insert_semicolon()) {
value = expression();
semicolon();
}
return new AST_Return({ value: value });
case "switch":
next();
return new AST_Switch({
expression : parenthesized(),
body : in_loop(switch_body_),
});
case "throw":
next();
if (has_newline_before(S.token))
croak("Illegal newline after 'throw'");
var value = expression();
semicolon();
return new AST_Throw({ value: value });
case "try":
next();
return try_();
case "var":
next();
var node = var_();
semicolon();
return node;
case "with":
if (S.input.has_directive("use strict")) {
croak("Strict mode may not include a with statement");
}
next();
return new AST_With({
expression : parenthesized(),
body : statement(),