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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
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 export extends finally for function if in instanceof new return switch throw try typeof var let void while with import';
var KEYWORDS_ATOM = 'false null true';
var RESERVED_WORDS = 'enum implements interface package private protected public static super this ' + KEYWORDS_ATOM + " " + KEYWORDS;
var KEYWORDS_BEFORE_EXPRESSION = 'return new delete throw else case yield';
KEYWORDS = makePredicate(KEYWORDS);
RESERVED_WORDS = makePredicate(RESERVED_WORDS);
KEYWORDS_BEFORE_EXPRESSION = makePredicate(KEYWORDS_BEFORE_EXPRESSION);
KEYWORDS_ATOM = makePredicate(KEYWORDS_ATOM);
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 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("[]{}(),;:"));
var REGEXP_MODIFIERS = makePredicate(characters("gmsiy"));
/* -----[ 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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};
function get_full_char(str, pos) {
var char = str.charAt(pos);
if (is_surrogate_pair_head(char)) {
var next = str.charAt(pos + 1);
if (is_surrogate_pair_tail(next)) {
return char + next;
}
}
if (is_surrogate_pair_tail(char)) {
var prev = str.charAt(pos - 1);
if (is_surrogate_pair_head(prev)) {
return prev + char;
}
}
return char;
}
function get_full_char_code(str, pos) {
// https://en.wikipedia.org/wiki/Universal_Character_Set_characters#Surrogates
if (is_surrogate_pair_head(str.charAt(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))) {
if (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) {
if (typeof code === "string")
code = code.charCodeAt(0);
return code >= 0xd800 && code <= 0xdbff;
}
function is_surrogate_pair_tail(code) {
if (typeof code === "string")
code = code.charCodeAt(0);
return code >= 0xdc00 && code <= 0xdfff;
}
function is_digit(code) {
return code >= 48 && code <= 57;
};
function is_identifier(name) {
if (typeof name !== "string" || RESERVED_WORDS(name))
return false;
return true;
};
function is_identifier_start(ch) {
var code = ch.charCodeAt(0);
return UNICODE.ID_Start.test(ch) || code == 36 || code == 95;
};
function is_identifier_char(ch) {
var code = ch.charCodeAt(0);
return UNICODE.ID_Continue.test(ch)
|| code == 36
|| code == 95
|| code == 8204 // \u200c: zero-width non-joiner <ZWNJ>
|| code == 8205 // \u200d: zero-width joiner <ZWJ> (in my ECMA-262 PDF, this is also 200c)
;
};
function is_identifier_string(str){
return /^[a-z_$][a-z0-9_$]*$/i.test(str);
};
function parse_js_number(num) {
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;
}
};
function JS_Parse_Error(message, filename, line, col, pos) {
this.message = message;
this.filename = filename;
this.line = line;
this.col = col;
this.pos = pos;
};
JS_Parse_Error.prototype = Object.create(Error.prototype);
JS_Parse_Error.prototype.constructor = JS_Parse_Error;
JS_Parse_Error.prototype.name = "SyntaxError";
configure_error_stack(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 : $TEXT,
filename : filename,
pos : 0,
tokpos : 0,
line : 1,
tokline : 0,
col : 0,
tokcol : 0,
newline_before : false,
regex_allowed : false,
brace_counter : 0,
template_braces : [],
comments_before : [],
directives : {},
directive_stack : []
};
function peek() { return get_full_char(S.text, S.pos); };
function next(signal_eof, in_string) {
var ch = get_full_char(S.text, S.pos++);
if (signal_eof && !ch)
throw EX_EOF;
if (NEWLINE_CHARS(ch)) {
S.newline_before = S.newline_before || !in_string;
++S.line;
S.col = 0;
if (!in_string && ch == "\r" && peek() == "\n") {
// treat a \r\n sequence as a single \n
++S.pos;
ch = "\n";
}
} else {
if (ch.length > 1) {
++S.pos;
++S.col;
}
++S.col;
}
return ch;
};
function forward(i) {
while (i-- > 0) next();
};
function looking_at(str) {
return S.text.substr(S.pos, str.length) == str;
};
function find_eol() {
var text = S.text;
for (var i = S.pos, n = S.text.length; i < n; ++i) {
var ch = text[i];
if (NEWLINE_CHARS(ch))
return i;
}
return -1;
};
function find(what, signal_eof) {
var pos = S.text.indexOf(what, S.pos);
if (signal_eof && pos == -1) throw EX_EOF;
return pos;
};
function start_token() {
S.tokline = S.line;
S.tokcol = S.col;
S.tokpos = S.pos;
};
var prev_was_dot = false;
function token(type, value, is_comment) {
S.regex_allowed = ((type == "operator" && !UNARY_POSTFIX(value)) ||
(type == "keyword" && KEYWORDS_BEFORE_EXPRESSION(value)) ||
(type == "punc" && PUNC_BEFORE_EXPRESSION(value))) ||
(type == "arrow");
if (type == "punc" && value == ".") {
prev_was_dot = true;
} else if (!is_comment) {
prev_was_dot = false;
}
var ret = {
type : type,
value : value,
line : S.tokline,
col : S.tokcol,
pos : S.tokpos,
endline : S.line,
endcol : S.col,
endpos : S.pos,
nlb : S.newline_before,
file : filename
};
if (/^(?:num|string|regexp)$/i.test(type)) {
ret.raw = $TEXT.substring(ret.pos, ret.endpos);
}
if (!is_comment) {
ret.comments_before = S.comments_before;
S.comments_before = [];
// make note of any newlines in the comments that came before
for (var i = 0, len = ret.comments_before.length; i < len; i++) {
ret.nlb = ret.nlb || ret.comments_before[i].nlb;
}
}
S.newline_before = false;
return new AST_Token(ret);
};
function skip_whitespace() {
while (WHITESPACE_CHARS(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 == ".";
var num = read_while(function(ch, i){
var code = ch.charCodeAt(0);
switch (code) {
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;
}
return RE_NUM_LITERAL.test(ch);
});
if (prefix) num = prefix + num;
if (RE_OCT_NUMBER.test(num) && next_token.has_directive("use strict")) {
parse_error("Legacy octal literals are not allowed in strict mode");
}
var valid = parse_js_number(num);
if (!isNaN(valid)) {
return token("num", valid);
} else {
parse_error("Invalid syntax: " + num);
}
};
function read_escaped_char(in_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)); // \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)) > 0x10FFFF) {
parse_error("Unicode reference out of bounce");
}
next(true);
return from_char_code(result);
}
return String.fromCharCode(hex_bytes(4));
case 10 : return ""; // newline
case 13 : // \r
if (peek() == "\n") { // DOS newline
next(true, in_string);
return "";
}
}
if (ch >= "0" && ch <= "7")
return read_octal_escape_sequence(ch);
return ch;
};
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));
}
function hex_bytes(n) {
var num = 0;
for (; n > 0; --n) {
var digit = parseInt(next(true), 16);
if (isNaN(digit))
parse_error("Invalid hex-character pattern in string");
num = (num << 4) | digit;
}
return num;
};
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;
});
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 === "$" && peek() === "{") {
next(true, true);
S.brace_counter++;
tok = token(begin ? "template_head" : "template_substitution", content);
tok.begin = begin;
tok.raw = raw;
tok.end = false;
return tok;
}
raw += ch;
if (ch === "\\") {
var tmp = S.pos;
ch = read_escaped_char();
raw += S.text.substr(tmp, S.pos - tmp);
}
content += ch;
}
S.template_braces.pop();
tok = token(begin ? "template_head" : "template_substitution", content);
tok.begin = begin;
tok.raw = raw;
tok.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.indexOf("\n") >= 0;
S.regex_allowed = regex_allowed;
return next_token;
});
var read_name = with_eof_error("Unterminated identifier name", function() {
var name = "", ch, escaped = false, hex;
var read_escaped_identifier_char = function() {
escaped = true;
next();
if (peek() !== "u") {
parse_error("Expecting UnicodeEscapeSequence -- uXXXX or u{XXXX}");
}
return read_escaped_char();
}
// Read first character (ID_Start)
if ((name = peek()) === "\\") {
name = read_escaped_identifier_char();
if (!is_identifier_start(name)) {
parse_error("First identifier char is an invalid identifier char");
}
} else if (is_identifier_start(name)){
next();
} else {
return "";
}
// 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 += ch;
}
if (RESERVED_WORDS(name) && escaped) {
parse_error("Escaped characters are not allowed in keywords");
}
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_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(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;
}
case 61: return handle_eq_sign();
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(ch)) return token("punc", next());
if (OPERATOR_CHARS(ch)) return read_operator();
if (code == 92 || is_identifier_start(ch)) return read_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([
"typeof",
"void",
"delete",
"--",
"++",
"!",
"~",
"-",
"+"
]);
var UNARY_POSTFIX = makePredicate([ "--", "++" ]);
var ASSIGNMENT = makePredicate([ "=", "+=", "-=", "/=", "*=", "**=", "%=", ">>=", "<<=", ">>>=", "|=", "^=", "&=" ]);
var PRECEDENCE = (function(a, ret){
for (var i = 0; i < a.length; ++i) {
var b = a[i];
for (var j = 0; j < b.length; ++j) {
ret[b[j]] = i + 1;
}
}
return ret;
})(
[
["||"],
["&&"],
["|"],
["^"],
["&"],
["==", "===", "!=", "!=="],
["<", ">", "<=", ">=", "in", "instanceof"],
[">>", "<<", ">>>"],
["+", "-"],
["*", "/", "%"],
["**"]
],
{}
);
var STATEMENTS_WITH_LABELS = array_to_hash([ "for", "do", "while", "switch" ]);
var ATOMIC_START_TOKEN = array_to_hash([ "atom", "num", "string", "regexp", "name" ]);
/* -----[ Parser ]----- */
function parse($TEXT, options) {
options = defaults(options, {
bare_returns : false,
expression : false,
filename : null,
html5_comments : true,
shebang : true,
strict : false,
toplevel : null,
});
var S = {
input : (typeof $TEXT == "string"
? tokenizer($TEXT, options.filename,
options.html5_comments, options.shebang)
: $TEXT),
token : null,
prev : null,
peeked : null,
in_function : 0,
in_generator : -1,
in_directives : true,
in_loop : 0,
labels : []
};
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 unexpected(token) {
if (token == null)
token = S.token;
token_error(token, "Unexpected token: " + token.type + " (" + token.value + ")");
};
function expect_token(type, val) {
if (is(type, val)) {
return next();
}
token_error(S.token, "Unexpected token " + S.token.type + " «" + S.token.value + "»" + ", expected " + type + " «" + val + "»");
};
function expect(punc) { return expect_token("punc", punc); };
function can_insert_semicolon() {
return !options.strict && (
S.token.nlb || is("eof") || is("punc", "}")
);
};
function is_in_generator() {
return S.in_generator === S.in_function;
}
function semicolon(optional) {
if (is("punc", ";")) next();
else if (!optional && !can_insert_semicolon()) unexpected();
};
function parenthesised() {
expect("(");
var exp = expression(true);
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() {
handle_regexp();
switch (S.token.type) {
case "string":
if (S.in_directives) {
var token = peek();
if (S.token.raw.indexOf("\\") == -1
&& (token.nlb
|| is_token(token, "eof")
|| is_token(token, "punc", ";")
|| is_token(token, "punc", "}"))) {
S.input.add_directive(S.token.value);
} else {
S.in_directives = false;
}
}
var dir = S.in_directives, stat = simple_statement();
return dir ? new AST_Directive(stat.body) : stat;
case "template_head":
case "num":
case "regexp":