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| author | Minteck <contact@minteck.org> | 2021-12-21 16:52:28 +0100 |
|---|---|---|
| committer | Minteck <contact@minteck.org> | 2021-12-21 16:52:28 +0100 |
| commit | 46e43f4bde4a35785b4997b81e86cd19f046b69b (patch) | |
| tree | c53c2f826f777f9d6b2d249dab556feb72a6c3a6 /src/node_modules/terser/lib/parse.js | |
| download | langdetect-46e43f4bde4a35785b4997b81e86cd19f046b69b.tar.gz langdetect-46e43f4bde4a35785b4997b81e86cd19f046b69b.tar.bz2 langdetect-46e43f4bde4a35785b4997b81e86cd19f046b69b.zip | |
Commit
Diffstat (limited to 'src/node_modules/terser/lib/parse.js')
| -rw-r--r-- | src/node_modules/terser/lib/parse.js | 3302 |
1 files changed, 3302 insertions, 0 deletions
diff --git a/src/node_modules/terser/lib/parse.js b/src/node_modules/terser/lib/parse.js new file mode 100644 index 0000000..0ec29f8 --- /dev/null +++ b/src/node_modules/terser/lib/parse.js @@ -0,0 +1,3302 @@ +/*********************************************************************** + + 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_ClassProperty, + AST_ConciseMethod, + 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_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_Lambda, + 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 LATEST_TEMPLATE_END = true; + +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 implements import interface package private protected public static super this " + KEYWORDS_ATOM + " " + KEYWORDS; +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); + +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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+}; + +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); + LATEST_RAW = raw; + LATEST_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); + LATEST_RAW = raw; + LATEST_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 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(); + 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 LOGICAL_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 ATOMIC_START_TOKEN = makePredicate([ "atom", "num", "big_int", "string", "regexp", "name" ]); + +/* -----[ Parser ]----- */ + +function parse($TEXT, options) { + // maps start tokens to count of comments found outside of their parens + // Example: /* I count */ ( /* I don't */ foo() ) + // Useful because comments_before property of call with parens outside + // contains both comments inside and outside these parens. Used to find the + // right #__PURE__ comments for an expression + const outer_comments_before_counts = new WeakMap(); + + options = defaults(options, { + bare_returns : false, + ecma : null, // Legacy + 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), + token : null, + prev : null, + peeked : null, + in_function : 0, + in_async : -1, + 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) peek(); + S.token = S.peeked; + S.peeked = null; + 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 has_newline_before(token) { + return token.nlb || !token.comments_before.every((comment) => !comment.nlb); + } + + function can_insert_semicolon() { + return !options.strict + && (is("eof") || is("punc", "}") || has_newline_before(S.token)); + } + + function is_in_generator() { + return S.in_generator === S.in_function; + } + + function is_in_async() { + return S.in_async === 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 _embed_tokens_wrapper(...args) { + const start = S.token; + const expr = parser(...args); + expr.start = start; + expr.end = prev(); + 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 statement(is_export_default, is_for_body, is_if_body) { + handle_regexp(); + switch (S.token.type) { + case "string": + if (S.in_directives) { + var token = peek(); + if (!LATEST_RAW.includes("\\") + && (is_token(token, "punc", ";") + || is_token(token, "punc", "}") + || has_newline_before(token) + || is_token(token, "eof"))) { + S.input.add_directive(S.token.value); + } else { + S.in_directives = false; + } + } + var dir = S.in_directives, stat = simple_statement(); + return dir && stat.body instanceof AST_String ? new AST_Directive(stat.body) : stat; + case "template_head": + case "num": + case "big_int": + case "regexp": + case "operator": + case "atom": + return simple_statement(); + + case "name": + if (S.token.value == "async" && is_token(peek(), "keyword", "function")) { + next(); + next(); + if (is_for_body) { + croak("functions are not allowed as the body of a loop"); + } + return function_(AST_Defun, false, true, is_export_default); + } + if (S.token.value == "import" && !is_token(peek(), "punc", "(") && !is_token(peek(), "punc", ".")) { + next(); + var node = import_(); + semicolon(); + return node; + } + 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 "(": + 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 "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 = parenthesised(); + semicolon(true); + return new AST_Do({ + body : body, + condition : condition + }); + + case "while": + next(); + return new AST_While({ + condition : parenthesised(), + body : in_loop(function() { return statement(false, true); }) + }); + + case "for": + next(); + return for_(); + + case "class": + next(); + if (is_for_body) { + croak("classes are not allowed as the body of a loop"); + } + if (is_if_body) { + croak("classes are not allowed as the body of an if"); + } + return class_(AST_DefClass); + + case "function": + next(); + if (is_for_body) { + croak("functions are not allowed as the body of a loop"); + } + return function_(AST_Defun, false, false, is_export_default); + + 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(true); + semicolon(); + } + return new AST_Return({ + value: value + }); + + case "switch": + next(); + return new AST_Switch({ + expression : parenthesised(), + body : in_loop(switch_body_) + }); + + case "throw": + next(); + if (has_newline_before(S.token)) + croak("Illegal newline after 'throw'"); + var value = expression(true); + semicolon(); + return new AST_Throw({ + value: value + }); + + case "try": + next(); + return try_(); + + case "var": + next(); + var node = var_(); + semicolon(); + return node; + + case "let": + next(); + var node = let_(); + semicolon(); + return node; + + case "const": + next(); + var node = const_(); + 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 : parenthesised(), + body : statement() + }); + + case "export": + if (!is_token(peek(), "punc", "(")) { + next(); + var node = export_(); + if (is("punc", ";")) semicolon(); + return node; + } + } + } + unexpected(); + }); + + function labeled_statement() { + var label = as_symbol(AST_Label); + if (label.name === "await" && is_in_async()) { + token_error(S.prev, "await cannot be used as label inside async function"); + } + if (S.labels.some((l) => l.name === label.name)) { + // ECMA-262, 12.12: An ECMAScript program is considered + // syntactically incorrect if it contains a + // LabelledStatement that is enclosed by a + // LabelledStatement with the same Identifier as label. + croak("Label " + label.name + " defined twice"); + } + expect(":"); + S.labels.push(label); + var stat = statement(); + S.labels.pop(); + if (!(stat instanceof AST_IterationStatement)) { + // check for `continue` that refers to this label. + // those should be reported as syntax errors. + // https://github.com/mishoo/UglifyJS2/issues/287 + label.references.forEach(function(ref) { + if (ref instanceof AST_Continue) { + ref = ref.label.start; + croak("Continue label `" + label.name + "` refers to non-IterationStatement.", + ref.line, ref.col, ref.pos); + } + }); + } + return new AST_LabeledStatement({ body: stat, label: label }); + } + + function simple_statement(tmp) { + return new AST_SimpleStatement({ body: (tmp = expression(true), semicolon(), tmp) }); + } + + function break_cont(type) { + var label = null, ldef; + if (!can_insert_semicolon()) { + label = as_symbol(AST_LabelRef, true); + } + if (label != null) { + ldef = S.labels.find((l) => l.name === label.name); + if (!ldef) + croak("Undefined label " + label.name); + label.thedef = ldef; + } else if (S.in_loop == 0) + croak(type.TYPE + " not inside a loop or switch"); + semicolon(); + var stat = new type({ label: label }); + if (ldef) ldef.references.push(stat); + return stat; + } + + function for_() { + var for_await_error = "`for await` invalid in this context"; + var await_tok = S.token; + if (await_tok.type == "name" && await_tok.value == "await") { + if (!is_in_async()) { + token_error(await_tok, for_await_error); + } + next(); + } else { + await_tok = false; + } + expect("("); + var init = null; + if (!is("punc", ";")) { + init = + is("keyword", "var") ? (next(), var_(true)) : + is("keyword", "let") ? (next(), let_(true)) : + is("keyword", "const") ? (next(), const_(true)) : + expression(true, true); + var is_in = is("operator", "in"); + var is_of = is("name", "of"); + if (await_tok && !is_of) { + token_error(await_tok, for_await_error); + } + if (is_in || is_of) { + if (init instanceof AST_Definitions) { + if (init.definitions.length > 1) + token_error(init.start, "Only one variable declaration allowed in for..in loop"); + } else if (!(is_assignable(init) || (init = to_destructuring(init)) instanceof AST_Destructuring)) { + token_error(init.start, "Invalid left-hand side in for..in loop"); + } + next(); + if (is_in) { + return for_in(init); + } else { + return for_of(init, !!await_tok); + } + } + } else if (await_tok) { + token_error(await_tok, for_await_error); + } + return regular_for(init); + } + + function regular_for(init) { + expect(";"); + var test = is("punc", ";") ? null : expression(true); + expect(";"); + var step = is("punc", ")") ? null : expression(true); + expect(")"); + return new AST_For({ + init : init, + condition : test, + step : step, + body : in_loop(function() { return statement(false, true); }) + }); + } + + function for_of(init, is_await) { + var lhs = init instanceof AST_Definitions ? init.definitions[0].name : null; + var obj = expression(true); + expect(")"); + return new AST_ForOf({ + await : is_await, + init : init, + name : lhs, + object : obj, + body : in_loop(function() { return statement(false, true); }) + }); + } + + function for_in(init) { + var obj = expression(true); + expect(")"); + return new AST_ForIn({ + init : init, + object : obj, + body : in_loop(function() { return statement(false, true); }) + }); + } + + var arrow_function = function(start, argnames, is_async) { + if (has_newline_before(S.token)) { + croak("Unexpected newline before arrow (=>)"); + } + + expect_token("arrow", "=>"); + + var body = _function_body(is("punc", "{"), false, is_async); + + var end = + body instanceof Array && body.length ? body[body.length - 1].end : + body instanceof Array ? start : + body.end; + + return new AST_Arrow({ + start : start, + end : end, + async : is_async, + argnames : argnames, + body : body + }); + }; + + var function_ = function(ctor, is_generator_property, is_async, is_export_default) { + var in_statement = ctor === AST_Defun; + var is_generator = is("operator", "*"); + if (is_generator) { + next(); + } + + var name = is("name") ? as_symbol(in_statement ? AST_SymbolDefun : AST_SymbolLambda) : null; + if (in_statement && !name) { + if (is_export_default) { + ctor = AST_Function; + } else { + unexpected(); + } + } + + if (name && ctor !== AST_Accessor && !(name instanceof AST_SymbolDeclaration)) + unexpected(prev()); + + var args = []; + var body = _function_body(true, is_generator || is_generator_property, is_async, name, args); + return new ctor({ + start : args.start, + end : body.end, + is_generator: is_generator, + async : is_async, + name : name, + argnames: args, + body : body + }); + }; + + function track_used_binding_identifiers(is_parameter, strict) { + var parameters = new Set(); + var duplicate = false; + var default_assignment = false; + var spread = false; + var strict_mode = !!strict; + var tracker = { + add_parameter: function(token) { + if (parameters.has(token.value)) { + if (duplicate === false) { + duplicate = token; + } + tracker.check_strict(); + } else { + parameters.add(token.value); + if (is_parameter) { + switch (token.value) { + case "arguments": + case "eval": + case "yield": + if (strict_mode) { + token_error(token, "Unexpected " + token.value + " identifier as parameter inside strict mode"); + } + break; + default: + if (RESERVED_WORDS.has(token.value)) { + unexpected(); + } + } + } + } + }, + mark_default_assignment: function(token) { + if (default_assignment === false) { + default_assignment = token; + } + }, + mark_spread: function(token) { + if (spread === false) { + spread = token; + } + }, + mark_strict_mode: function() { + strict_mode = true; + }, + is_strict: function() { + return default_assignment !== false || spread !== false || strict_mode; + }, + check_strict: function() { + if (tracker.is_strict() && duplicate !== false) { + token_error(duplicate, "Parameter " + duplicate.value + " was used already"); + } + } + }; + + return tracker; + } + + function parameters(params) { + var used_parameters = track_used_binding_identifiers(true, S.input.has_directive("use strict")); + + expect("("); + + while (!is("punc", ")")) { + var param = parameter(used_parameters); + params.push(param); + + if (!is("punc", ")")) { + expect(","); + } + + if (param instanceof AST_Expansion) { + break; + } + } + + next(); + } + + function parameter(used_parameters, symbol_type) { + var param; + var expand = false; + if (used_parameters === undefined) { + used_parameters = track_used_binding_identifiers(true, S.input.has_directive("use strict")); + } + if (is("expand", "...")) { + expand = S.token; + used_parameters.mark_spread(S.token); + next(); + } + param = binding_element(used_parameters, symbol_type); + + if (is("operator", "=") && expand === false) { + used_parameters.mark_default_assignment(S.token); + next(); + param = new AST_DefaultAssign({ + start: param.start, + left: param, + operator: "=", + right: expression(false), + end: S.token + }); + } + + if (expand !== false) { + if (!is("punc", ")")) { + unexpected(); + } + param = new AST_Expansion({ + start: expand, + expression: param, + end: expand + }); + } + used_parameters.check_strict(); + + return param; + } + + function binding_element(used_parameters, symbol_type) { + var elements = []; + var first = true; + var is_expand = false; + var expand_token; + var first_token = S.token; + if (used_parameters === undefined) { + used_parameters = track_used_binding_identifiers(false, S.input.has_directive("use strict")); + } + symbol_type = symbol_type === undefined ? AST_SymbolFunarg : symbol_type; + if (is("punc", "[")) { + next(); + while (!is("punc", "]")) { + if (first) { + first = false; + } else { + expect(","); + } + + if (is("expand", "...")) { + is_expand = true; + expand_token = S.token; + used_parameters.mark_spread(S.token); + next(); + } + if (is("punc")) { + switch (S.token.value) { + case ",": + elements.push(new AST_Hole({ + start: S.token, + end: S.token + })); + continue; + case "]": // Trailing comma after last element + break; + case "[": + case "{": + elements.push(binding_element(used_parameters, symbol_type)); + break; + default: + unexpected(); + } + } else if (is("name")) { + used_parameters.add_parameter(S.token); + elements.push(as_symbol(symbol_type)); + } else { + croak("Invalid function parameter"); + } + if (is("operator", "=") && is_expand === false) { + used_parameters.mark_default_assignment(S.token); + next(); + elements[elements.length - 1] = new AST_DefaultAssign({ + start: elements[elements.length - 1].start, + left: elements[elements.length - 1], + operator: "=", + right: expression(false), + end: S.token + }); + } + if (is_expand) { + if (!is("punc", "]")) { + croak("Rest element must be last element"); + } + elements[elements.length - 1] = new AST_Expansion({ + start: expand_token, + expression: elements[elements.length - 1], + end: expand_token + }); + } + } + expect("]"); + used_parameters.check_strict(); + return new AST_Destructuring({ + start: first_token, + names: elements, + is_array: true, + end: prev() + }); + } else if (is("punc", "{")) { + next(); + while (!is("punc", "}")) { + if (first) { + first = false; + } else { + expect(","); + } + if (is("expand", "...")) { + is_expand = true; + expand_token = S.token; + used_parameters.mark_spread(S.token); + next(); + } + if (is("name") && (is_token(peek(), "punc") || is_token(peek(), "operator")) && [",", "}", "="].includes(peek().value)) { + used_parameters.add_parameter(S.token); + var start = prev(); + var value = as_symbol(symbol_type); + if (is_expand) { + elements.push(new AST_Expansion({ + start: expand_token, + expression: value, + end: value.end, + })); + } else { + elements.push(new AST_ObjectKeyVal({ + start: start, + key: value.name, + value: value, + end: value.end, + })); + } + } else if (is("punc", "}")) { + continue; // Allow trailing hole + } else { + var property_token = S.token; + var property = as_property_name(); + if (property === null) { + unexpected(prev()); + } else if (prev().type === "name" && !is("punc", ":")) { + elements.push(new AST_ObjectKeyVal({ + start: prev(), + key: property, + value: new symbol_type({ + start: prev(), + name: property, + end: prev() + }), + end: prev() + })); + } else { + expect(":"); + elements.push(new AST_ObjectKeyVal({ + start: property_token, + quote: property_token.quote, + key: property, + value: binding_element(used_parameters, symbol_type), + end: prev() + })); + } + } + if (is_expand) { + if (!is("punc", "}")) { + croak("Rest element must be last element"); + } + } else if (is("operator", "=")) { + used_parameters.mark_default_assignment(S.token); + next(); + elements[elements.length - 1].value = new AST_DefaultAssign({ + start: elements[elements.length - 1].value.start, + left: elements[elements.length - 1].value, + operator: "=", + right: expression(false), + end: S.token + }); + } + } + expect("}"); + used_parameters.check_strict(); + return new AST_Destructuring({ + start: first_token, + names: elements, + is_array: false, + end: prev() + }); + } else if (is("name")) { + used_parameters.add_parameter(S.token); + return as_symbol(symbol_type); + } else { + croak("Invalid function parameter"); + } + } + + function params_or_seq_(allow_arrows, maybe_sequence) { + var spread_token; + var invalid_sequence; + var trailing_comma; + var a = []; + expect("("); + while (!is("punc", ")")) { + if (spread_token) unexpected(spread_token); + if (is("expand", "...")) { + spread_token = S.token; + if (maybe_sequence) invalid_sequence = S.token; + next(); + a.push(new AST_Expansion({ + start: prev(), + expression: expression(), + end: S.token, + })); + } else { + a.push(expression()); + } + if (!is("punc", ")")) { + expect(","); + if (is("punc", ")")) { + trailing_comma = prev(); + if (maybe_sequence) invalid_sequence = trailing_comma; + } + } + } + expect(")"); + if (allow_arrows && is("arrow", "=>")) { + if (spread_token && trailing_comma) unexpected(trailing_comma); + } else if (invalid_sequence) { + unexpected(invalid_sequence); + } + return a; + } + + function _function_body(block, generator, is_async, name, args) { + var loop = S.in_loop; + var labels = S.labels; + var current_generator = S.in_generator; + var current_async = S.in_async; + ++S.in_function; + if (generator) + S.in_generator = S.in_function; + if (is_async) + S.in_async = S.in_function; + if (args) parameters(args); + if (block) + S.in_directives = true; + S.in_loop = 0; + S.labels = []; + if (block) { + S.input.push_directives_stack(); + var a = block_(); + if (name) _verify_symbol(name); + if (args) args.forEach(_verify_symbol); + S.input.pop_directives_stack(); + } else { + var a = [new AST_Return({ + start: S.token, + value: expression(false), + end: S.token + })]; + } + --S.in_function; + S.in_loop = loop; + S.labels = labels; + S.in_generator = current_generator; + S.in_async = current_async; + return a; + } + + function _await_expression() { + // Previous token must be "await" and not be interpreted as an identifier + if (!is_in_async()) { + croak("Unexpected await expression outside async function", + S.prev.line, S.prev.col, S.prev.pos); + } + // the await expression is parsed as a unary expression in Babel + return new AST_Await({ + start: prev(), + end: S.token, + expression : maybe_unary(true), + }); + } + + function _yield_expression() { + // Previous token must be keyword yield and not be interpret as an identifier + if (!is_in_generator()) { + croak("Unexpected yield expression outside generator function", + S.prev.line, S.prev.col, S.prev.pos); + } + var start = S.token; + var star = false; + var has_expression = true; + + // Attempt to get expression or star (and then the mandatory expression) + // behind yield on the same line. + // + // If nothing follows on the same line of the yieldExpression, + // it should default to the value `undefined` for yield to return. + // In that case, the `undefined` stored as `null` in ast. + // + // Note 1: It isn't allowed for yield* to close without an expression + // Note 2: If there is a nlb between yield and star, it is interpret as + // yield <explicit undefined> <inserted automatic semicolon> * + if (can_insert_semicolon() || + (is("punc") && PUNC_AFTER_EXPRESSION.has(S.token.value))) { + has_expression = false; + + } else if (is("operator", "*")) { + star = true; + next(); + } + + return new AST_Yield({ + start : start, + is_star : star, + expression : has_expression ? expression() : null, + end : prev() + }); + } + + function if_() { + var cond = parenthesised(), body = statement(false, false, true), belse = null; + if (is("keyword", "else")) { + next(); + belse = statement(false, false, true); + } + return new AST_If({ + condition : cond, + body : body, + alternative : belse + }); + } + + function block_() { + expect("{"); + var a = []; + while (!is("punc", "}")) { + if (is("eof")) unexpected(); + a.push(statement()); + } + next(); + return a; + } + + function switch_body_() { + expect("{"); + var a = [], cur = null, branch = null, tmp; + while (!is("punc", "}")) { + if (is("eof")) unexpected(); + if (is("keyword", "case")) { + if (branch) branch.end = prev(); + cur = []; + branch = new AST_Case({ + start : (tmp = S.token, next(), tmp), + expression : expression(true), + body : cur + }); + a.push(branch); + expect(":"); + } else if (is("keyword", "default")) { + if (branch) branch.end = prev(); + cur = []; + branch = new AST_Default({ + start : (tmp = S.token, next(), expect(":"), tmp), + body : cur + }); + a.push(branch); + } else { + if (!cur) unexpected(); + cur.push(statement()); + } + } + if (branch) branch.end = prev(); + next(); + return a; + } + + function try_() { + var body = block_(), bcatch = null, bfinally = null; + if (is("keyword", "catch")) { + var start = S.token; + next(); + if (is("punc", "{")) { + var name = null; + } else { + expect("("); + var name = parameter(undefined, AST_SymbolCatch); + expect(")"); + } + bcatch = new AST_Catch({ + start : start, + argname : name, + body : block_(), + end : prev() + }); + } + if (is("keyword", "finally")) { + var start = S.token; + next(); + bfinally = new AST_Finally({ + start : start, + body : block_(), + end : prev() + }); + } + if (!bcatch && !bfinally) + croak("Missing catch/finally blocks"); + return new AST_Try({ + body : body, + bcatch : bcatch, + bfinally : bfinally + }); + } + + function vardefs(no_in, kind) { + var a = []; + var def; + for (;;) { + var sym_type = + kind === "var" ? AST_SymbolVar : + kind === "const" ? AST_SymbolConst : + kind === "let" ? AST_SymbolLet : null; + if (is("punc", "{") || is("punc", "[")) { + def = new AST_VarDef({ + start: S.token, + name: binding_element(undefined ,sym_type), + value: is("operator", "=") ? (expect_token("operator", "="), expression(false, no_in)) : null, + end: prev() + }); + } else { + def = new AST_VarDef({ + start : S.token, + name : as_symbol(sym_type), + value : is("operator", "=") + ? (next(), expression(false, no_in)) + : !no_in && kind === "const" + ? croak("Missing initializer in const declaration") : null, + end : prev() + }); + if (def.name.name == "import") croak("Unexpected token: import"); + } + a.push(def); + if (!is("punc", ",")) + break; + next(); + } + return a; + } + + var var_ = function(no_in) { + return new AST_Var({ + start : prev(), + definitions : vardefs(no_in, "var"), + end : prev() + }); + }; + + var let_ = function(no_in) { + return new AST_Let({ + start : prev(), + definitions : vardefs(no_in, "let"), + end : prev() + }); + }; + + var const_ = function(no_in) { + return new AST_Const({ + start : prev(), + definitions : vardefs(no_in, "const"), + end : prev() + }); + }; + + var new_ = function(allow_calls) { + var start = S.token; + expect_token("operator", "new"); + if (is("punc", ".")) { + next(); + expect_token("name", "target"); + return subscripts(new AST_NewTarget({ + start : start, + end : prev() + }), allow_calls); + } + var newexp = expr_atom(false), args; + if (is("punc", "(")) { + next(); + args = expr_list(")", true); + } else { + args = []; + } + var call = new AST_New({ + start : start, + expression : newexp, + args : args, + end : prev() + }); + annotate(call); + return subscripts(call, allow_calls); + }; + + function as_atom_node() { + var tok = S.token, ret; + switch (tok.type) { + case "name": + ret = _make_symbol(AST_SymbolRef); + break; + case "num": + ret = new AST_Number({ + start: tok, + end: tok, + value: tok.value, + raw: LATEST_RAW + }); + break; + case "big_int": + ret = new AST_BigInt({ start: tok, end: tok, value: tok.value }); + break; + case "string": + ret = new AST_String({ + start : tok, + end : tok, + value : tok.value, + quote : tok.quote + }); + break; + case "regexp": + const [_, source, flags] = tok.value.match(/^\/(.*)\/(\w*)$/); + + ret = new AST_RegExp({ start: tok, end: tok, value: { source, flags } }); + break; + case "atom": + switch (tok.value) { + case "false": + ret = new AST_False({ start: tok, end: tok }); + break; + case "true": + ret = new AST_True({ start: tok, end: tok }); + break; + case "null": + ret = new AST_Null({ start: tok, end: tok }); + break; + } + break; + } + next(); + return ret; + } + + function to_fun_args(ex, default_seen_above) { + var insert_default = function(ex, default_value) { + if (default_value) { + return new AST_DefaultAssign({ + start: ex.start, + left: ex, + operator: "=", + right: default_value, + end: default_value.end + }); + } + return ex; + }; + if (ex instanceof AST_Object) { + return insert_default(new AST_Destructuring({ + start: ex.start, + end: ex.end, + is_array: false, + names: ex.properties.map(prop => to_fun_args(prop)) + }), default_seen_above); + } else if (ex instanceof AST_ObjectKeyVal) { + ex.value = to_fun_args(ex.value); + return insert_default(ex, default_seen_above); + } else if (ex instanceof AST_Hole) { + return ex; + } else if (ex instanceof AST_Destructuring) { + ex.names = ex.names.map(name => to_fun_args(name)); + return insert_default(ex, default_seen_above); + } else if (ex instanceof AST_SymbolRef) { + return insert_default(new AST_SymbolFunarg({ + name: ex.name, + start: ex.start, + end: ex.end + }), default_seen_above); + } else if (ex instanceof AST_Expansion) { + ex.expression = to_fun_args(ex.expression); + return insert_default(ex, default_seen_above); + } else if (ex instanceof AST_Array) { + return insert_default(new AST_Destructuring({ + start: ex.start, + end: ex.end, + is_array: true, + names: ex.elements.map(elm => to_fun_args(elm)) + }), default_seen_above); + } else if (ex instanceof AST_Assign) { + return insert_default(to_fun_args(ex.left, ex.right), default_seen_above); + } else if (ex instanceof AST_DefaultAssign) { + ex.left = to_fun_args(ex.left); + return ex; + } else { + croak("Invalid function parameter", ex.start.line, ex.start.col); + } + } + + var expr_atom = function(allow_calls, allow_arrows) { + if (is("operator", "new")) { + return new_(allow_calls); + } + if (is("operator", "import")) { + return import_meta(); + } + var start = S.token; + var peeked; + var async = is("name", "async") + && (peeked = peek()).value != "[" + && peeked.type != "arrow" + && as_atom_node(); + if (is("punc")) { + switch (S.token.value) { + case "(": + if (async && !allow_calls) break; + var exprs = params_or_seq_(allow_arrows, !async); + if (allow_arrows && is("arrow", "=>")) { + return arrow_function(start, exprs.map(e => to_fun_args(e)), !!async); + } + var ex = async ? new AST_Call({ + expression: async, + args: exprs + }) : exprs.length == 1 ? exprs[0] : new AST_Sequence({ + expressions: exprs + }); + if (ex.start) { + const outer_comments_before = start.comments_before.length; + outer_comments_before_counts.set(start, outer_comments_before); + ex.start.comments_before.unshift(...start.comments_before); + start.comments_before = ex.start.comments_before; + if (outer_comments_before == 0 && start.comments_before.length > 0) { + var comment = start.comments_before[0]; + if (!comment.nlb) { + comment.nlb = start.nlb; + start.nlb = false; + } + } + start.comments_after = ex.start.comments_after; + } + ex.start = start; + var end = prev(); + if (ex.end) { + end.comments_before = ex.end.comments_before; + ex.end.comments_after.push(...end.comments_after); + end.comments_after = ex.end.comments_after; + } + ex.end = end; + if (ex instanceof AST_Call) annotate(ex); + return subscripts(ex, allow_calls); + case "[": + return subscripts(array_(), allow_calls); + case "{": + return subscripts(object_or_destructuring_(), allow_calls); + } + if (!async) unexpected(); + } + if (allow_arrows && is("name") && is_token(peek(), "arrow")) { + var param = new AST_SymbolFunarg({ + name: S.token.value, + start: start, + end: start, + }); + next(); + return arrow_function(start, [param], !!async); + } + if (is("keyword", "function")) { + next(); + var func = function_(AST_Function, false, !!async); + func.start = start; + func.end = prev(); + return subscripts(func, allow_calls); + } + if (async) return subscripts(async, allow_calls); + if (is("keyword", "class")) { + next(); + var cls = class_(AST_ClassExpression); + cls.start = start; + cls.end = prev(); + return subscripts(cls, allow_calls); + } + if (is("template_head")) { + return subscripts(template_string(), allow_calls); + } + if (ATOMIC_START_TOKEN.has(S.token.type)) { + return subscripts(as_atom_node(), allow_calls); + } + unexpected(); + }; + + function template_string() { + var segments = [], start = S.token; + + segments.push(new AST_TemplateSegment({ + start: S.token, + raw: LATEST_RAW, + value: S.token.value, + end: S.token + })); + + while (!LATEST_TEMPLATE_END) { + next(); + handle_regexp(); + segments.push(expression(true)); + + segments.push(new AST_TemplateSegment({ + start: S.token, + raw: LATEST_RAW, + value: S.token.value, + end: S.token + })); + } + next(); + + return new AST_TemplateString({ + start: start, + segments: segments, + end: S.token + }); + } + + function expr_list(closing, allow_trailing_comma, allow_empty) { + var first = true, a = []; + while (!is("punc", closing)) { + if (first) first = false; else expect(","); + if (allow_trailing_comma && is("punc", closing)) break; + if (is("punc", ",") && allow_empty) { + a.push(new AST_Hole({ start: S.token, end: S.token })); + } else if (is("expand", "...")) { + next(); + a.push(new AST_Expansion({start: prev(), expression: expression(),end: S.token})); + } else { + a.push(expression(false)); + } + } + next(); + return a; + } + + var array_ = embed_tokens(function() { + expect("["); + return new AST_Array({ + elements: expr_list("]", !options.strict, true) + }); + }); + + var create_accessor = embed_tokens((is_generator, is_async) => { + return function_(AST_Accessor, is_generator, is_async); + }); + + var object_or_destructuring_ = embed_tokens(function object_or_destructuring_() { + var start = S.token, first = true, a = []; + expect("{"); + while (!is("punc", "}")) { + if (first) first = false; else expect(","); + if (!options.strict && is("punc", "}")) + // allow trailing comma + break; + + start = S.token; + if (start.type == "expand") { + next(); + a.push(new AST_Expansion({ + start: start, + expression: expression(false), + end: prev(), + })); + continue; + } + + var name = as_property_name(); + var value; + + // Check property and fetch value + if (!is("punc", ":")) { + var concise = concise_method_or_getset(name, start); + if (concise) { + a.push(concise); + continue; + } + + value = new AST_SymbolRef({ + start: prev(), + name: name, + end: prev() + }); + } else if (name === null) { + unexpected(prev()); + } else { + next(); // `:` - see first condition + value = expression(false); + } + + // Check for default value and alter value accordingly if necessary + if (is("operator", "=")) { + next(); + value = new AST_Assign({ + start: start, + left: value, + operator: "=", + right: expression(false), + logical: false, + end: prev() + }); + } + + // Create property + a.push(new AST_ObjectKeyVal({ + start: start, + quote: start.quote, + key: name instanceof AST_Node ? name : "" + name, + value: value, + end: prev() + })); + } + next(); + return new AST_Object({ properties: a }); + }); + + function class_(KindOfClass) { + var start, method, class_name, extends_, a = []; + + S.input.push_directives_stack(); // Push directive stack, but not scope stack + S.input.add_directive("use strict"); + + if (S.token.type == "name" && S.token.value != "extends") { + class_name = as_symbol(KindOfClass === AST_DefClass ? AST_SymbolDefClass : AST_SymbolClass); + } + + if (KindOfClass === AST_DefClass && !class_name) { + unexpected(); + } + + if (S.token.value == "extends") { + next(); + extends_ = expression(true); + } + + expect("{"); + + while (is("punc", ";")) { next(); } // Leading semicolons are okay in class bodies. + while (!is("punc", "}")) { + start = S.token; + method = concise_method_or_getset(as_property_name(), start, true); + if (!method) { unexpected(); } + a.push(method); + while (is("punc", ";")) { next(); } + } + + S.input.pop_directives_stack(); + + next(); + + return new KindOfClass({ + start: start, + name: class_name, + extends: extends_, + properties: a, + end: prev(), + }); + } + + function concise_method_or_getset(name, start, is_class) { + var get_method_name_ast = function(name, start) { + if (typeof name === "string" || typeof name === "number") { + return new AST_SymbolMethod({ + start, + name: "" + name, + end: prev() + }); + } else if (name === null) { + unexpected(); + } + return name; + }; + const get_class_property_key_ast = (name) => { + if (typeof name === "string" || typeof name === "number") { + return new AST_SymbolClassProperty({ + start: property_token, + end: property_token, + name: "" + name + }); + } else if (name === null) { + unexpected(); + } + return name; + }; + var is_async = false; + var is_static = false; + var is_generator = false; + var property_token = start; + if (is_class && name === "static" && !is("punc", "(")) { + is_static = true; + property_token = S.token; + name = as_property_name(); + } + if (name === "async" && !is("punc", "(") && !is("punc", ",") && !is("punc", "}") && !is("operator", "=")) { + is_async = true; + property_token = S.token; + name = as_property_name(); + } + if (name === null) { + is_generator = true; + property_token = S.token; + name = as_property_name(); + if (name === null) { + unexpected(); + } + } + if (is("punc", "(")) { + name = get_method_name_ast(name, start); + var node = new AST_ConciseMethod({ + start : start, + static : is_static, + is_generator: is_generator, + async : is_async, + key : name, + quote : name instanceof AST_SymbolMethod ? + property_token.quote : undefined, + value : create_accessor(is_generator, is_async), + end : prev() + }); + return node; + } + const setter_token = S.token; + if (name == "get") { + if (!is("punc") || is("punc", "[")) { + name = get_method_name_ast(as_property_name(), start); + return new AST_ObjectGetter({ + start : start, + static: is_static, + key : name, + quote : name instanceof AST_SymbolMethod ? + setter_token.quote : undefined, + value : create_accessor(), + end : prev() + }); + } + } else if (name == "set") { + if (!is("punc") || is("punc", "[")) { + name = get_method_name_ast(as_property_name(), start); + return new AST_ObjectSetter({ + start : start, + static: is_static, + key : name, + quote : name instanceof AST_SymbolMethod ? + setter_token.quote : undefined, + value : create_accessor(), + end : prev() + }); + } + } + if (is_class) { + const key = get_class_property_key_ast(name, property_token); + const quote = key instanceof AST_SymbolClassProperty + ? property_token.quote + : undefined; + if (is("operator", "=")) { + next(); + return new AST_ClassProperty({ + start, + static: is_static, + quote, + key, + value: expression(false), + end: prev() + }); + } else if (is("name") || is("punc", ";") || is("punc", "}")) { + return new AST_ClassProperty({ + start, + static: is_static, + quote, + key, + end: prev() + }); + } + } + } + + function import_() { + var start = prev(); + + var imported_name; + var imported_names; + if (is("name")) { + imported_name = as_symbol(AST_SymbolImport); + } + + if (is("punc", ",")) { + next(); + } + + imported_names = map_names(true); + + if (imported_names || imported_name) { + expect_token("name", "from"); + } + var mod_str = S.token; + if (mod_str.type !== "string") { + unexpected(); + } + next(); + return new AST_Import({ + start: start, + imported_name: imported_name, + imported_names: imported_names, + module_name: new AST_String({ + start: mod_str, + value: mod_str.value, + quote: mod_str.quote, + end: mod_str, + }), + end: S.token, + }); + } + + function import_meta() { + var start = S.token; + expect_token("operator", "import"); + expect_token("punc", "."); + expect_token("name", "meta"); + return subscripts(new AST_ImportMeta({ + start: start, + end: prev() + }), false); + } + + function map_name(is_import) { + function make_symbol(type) { + return new type({ + name: as_property_name(), + start: prev(), + end: prev() + }); + } + + var foreign_type = is_import ? AST_SymbolImportForeign : AST_SymbolExportForeign; + var type = is_import ? AST_SymbolImport : AST_SymbolExport; + var start = S.token; + var foreign_name; + var name; + + if (is_import) { + foreign_name = make_symbol(foreign_type); + } else { + name = make_symbol(type); + } + if (is("name", "as")) { + next(); // The "as" word + if (is_import) { + name = make_symbol(type); + } else { + foreign_name = make_symbol(foreign_type); + } + } else if (is_import) { + name = new type(foreign_name); + } else { + foreign_name = new foreign_type(name); + } + + return new AST_NameMapping({ + start: start, + foreign_name: foreign_name, + name: name, + end: prev(), + }); + } + + function map_nameAsterisk(is_import, name) { + var foreign_type = is_import ? AST_SymbolImportForeign : AST_SymbolExportForeign; + var type = is_import ? AST_SymbolImport : AST_SymbolExport; + var start = S.token; + var foreign_name; + var end = prev(); + + name = name || new type({ + name: "*", + start: start, + end: end, + }); + + foreign_name = new foreign_type({ + name: "*", + start: start, + end: end, + }); + + return new AST_NameMapping({ + start: start, + foreign_name: foreign_name, + name: name, + end: end, + }); + } + + function map_names(is_import) { + var names; + if (is("punc", "{")) { + next(); + names = []; + while (!is("punc", "}")) { + names.push(map_name(is_import)); + if (is("punc", ",")) { + next(); + } + } + next(); + } else if (is("operator", "*")) { + var name; + next(); + if (is_import && is("name", "as")) { + next(); // The "as" word + name = as_symbol(is_import ? AST_SymbolImport : AST_SymbolExportForeign); + } + names = [map_nameAsterisk(is_import, name)]; + } + return names; + } + + function export_() { + var start = S.token; + var is_default; + var exported_names; + + if (is("keyword", "default")) { + is_default = true; + next(); + } else if (exported_names = map_names(false)) { + if (is("name", "from")) { + next(); + + var mod_str = S.token; + if (mod_str.type !== "string") { + unexpected(); + } + next(); + + return new AST_Export({ + start: start, + is_default: is_default, + exported_names: exported_names, + module_name: new AST_String({ + start: mod_str, + value: mod_str.value, + quote: mod_str.quote, + end: mod_str, + }), + end: prev(), + }); + } else { + return new AST_Export({ + start: start, + is_default: is_default, + exported_names: exported_names, + end: prev(), + }); + } + } + + var node; + var exported_value; + var exported_definition; + if (is("punc", "{") + || is_default + && (is("keyword", "class") || is("keyword", "function")) + && is_token(peek(), "punc")) { + exported_value = expression(false); + semicolon(); + } else if ((node = statement(is_default)) instanceof AST_Definitions && is_default) { + unexpected(node.start); + } else if (node instanceof AST_Definitions || node instanceof AST_Lambda || node instanceof AST_DefClass) { + exported_definition = node; + } else if (node instanceof AST_SimpleStatement) { + exported_value = node.body; + } else { + unexpected(node.start); + } + + return new AST_Export({ + start: start, + is_default: is_default, + exported_value: exported_value, + exported_definition: exported_definition, + end: prev(), + }); + } + + function as_property_name() { + var tmp = S.token; + switch (tmp.type) { + case "punc": + if (tmp.value === "[") { + next(); + var ex = expression(false); + expect("]"); + return ex; + } else unexpected(tmp); + case "operator": + if (tmp.value === "*") { + next(); + return null; + } + if (!["delete", "in", "instanceof", "new", "typeof", "void"].includes(tmp.value)) { + unexpected(tmp); + } + /* falls through */ + case "name": + case "string": + case "num": + case "big_int": + case "keyword": + case "atom": + next(); + return tmp.value; + default: + unexpected(tmp); + } + } + + function as_name() { + var tmp = S.token; + if (tmp.type != "name") unexpected(); + next(); + return tmp.value; + } + + function _make_symbol(type) { + var name = S.token.value; + return new (name == "this" ? AST_This : + name == "super" ? AST_Super : + type)({ + name : String(name), + start : S.token, + end : S.token + }); + } + + function _verify_symbol(sym) { + var name = sym.name; + if (is_in_generator() && name == "yield") { + token_error(sym.start, "Yield cannot be used as identifier inside generators"); + } + if (S.input.has_directive("use strict")) { + if (name == "yield") { + token_error(sym.start, "Unexpected yield identifier inside strict mode"); + } + if (sym instanceof AST_SymbolDeclaration && (name == "arguments" || name == "eval")) { + token_error(sym.start, "Unexpected " + name + " in strict mode"); + } + } + } + + function as_symbol(type, noerror) { + if (!is("name")) { + if (!noerror) croak("Name expected"); + return null; + } + var sym = _make_symbol(type); + _verify_symbol(sym); + next(); + return sym; + } + + // Annotate AST_Call, AST_Lambda or AST_New with the special comments + function annotate(node) { + var start = node.start; + var comments = start.comments_before; + const comments_outside_parens = outer_comments_before_counts.get(start); + var i = comments_outside_parens != null ? comments_outside_parens : comments.length; + while (--i >= 0) { + var comment = comments[i]; + if (/[@#]__/.test(comment.value)) { + if (/[@#]__PURE__/.test(comment.value)) { + set_annotation(node, _PURE); + break; + } + if (/[@#]__INLINE__/.test(comment.value)) { + set_annotation(node, _INLINE); + break; + } + if (/[@#]__NOINLINE__/.test(comment.value)) { + set_annotation(node, _NOINLINE); + break; + } + } + } + } + + var subscripts = function(expr, allow_calls, is_chain) { + var start = expr.start; + if (is("punc", ".")) { + next(); + return subscripts(new AST_Dot({ + start : start, + expression : expr, + optional : false, + property : as_name(), + end : prev() + }), allow_calls, is_chain); + } + if (is("punc", "[")) { + next(); + var prop = expression(true); + expect("]"); + return subscripts(new AST_Sub({ + start : start, + expression : expr, + optional : false, + property : prop, + end : prev() + }), allow_calls, is_chain); + } + if (allow_calls && is("punc", "(")) { + next(); + var call = new AST_Call({ + start : start, + expression : expr, + optional : false, + args : call_args(), + end : prev() + }); + annotate(call); + return subscripts(call, true, is_chain); + } + + if (is("punc", "?.")) { + next(); + + let chain_contents; + + if (allow_calls && is("punc", "(")) { + next(); + + const call = new AST_Call({ + start, + optional: true, + expression: expr, + args: call_args(), + end: prev() + }); + annotate(call); + + chain_contents = subscripts(call, true, true); + } else if (is("name")) { + chain_contents = subscripts(new AST_Dot({ + start, + expression: expr, + optional: true, + property: as_name(), + end: prev() + }), allow_calls, true); + } else if (is("punc", "[")) { + next(); + const property = expression(true); + expect("]"); + chain_contents = subscripts(new AST_Sub({ + start, + expression: expr, + optional: true, + property, + end: prev() + }), allow_calls, true); + } + + if (!chain_contents) unexpected(); + + if (chain_contents instanceof AST_Chain) return chain_contents; + + return new AST_Chain({ + start, + expression: chain_contents, + end: prev() + }); + } + + if (is("template_head")) { + if (is_chain) { + // a?.b`c` is a syntax error + unexpected(); + } + + return subscripts(new AST_PrefixedTemplateString({ + start: start, + prefix: expr, + template_string: template_string(), + end: prev() + }), allow_calls); + } + + return expr; + }; + + function call_args() { + var args = []; + while (!is("punc", ")")) { + if (is("expand", "...")) { + next(); + args.push(new AST_Expansion({ + start: prev(), + expression: expression(false), + end: prev() + })); + } else { + args.push(expression(false)); + } + if (!is("punc", ")")) { + expect(","); + } + } + next(); + return args; + } + + var maybe_unary = function(allow_calls, allow_arrows) { + var start = S.token; + if (start.type == "name" && start.value == "await") { + if (is_in_async()) { + next(); + return _await_expression(); + } else if (S.input.has_directive("use strict")) { + token_error(S.token, "Unexpected await identifier inside strict mode"); + } + } + if (is("operator") && UNARY_PREFIX.has(start.value)) { + next(); + handle_regexp(); + var ex = make_unary(AST_UnaryPrefix, start, maybe_unary(allow_calls)); + ex.start = start; + ex.end = prev(); + return ex; + } + var val = expr_atom(allow_calls, allow_arrows); + while (is("operator") && UNARY_POSTFIX.has(S.token.value) && !has_newline_before(S.token)) { + if (val instanceof AST_Arrow) unexpected(); + val = make_unary(AST_UnaryPostfix, S.token, val); + val.start = start; + val.end = S.token; + next(); + } + return val; + }; + + function make_unary(ctor, token, expr) { + var op = token.value; + switch (op) { + case "++": + case "--": + if (!is_assignable(expr)) + croak("Invalid use of " + op + " operator", token.line, token.col, token.pos); + break; + case "delete": + if (expr instanceof AST_SymbolRef && S.input.has_directive("use strict")) + croak("Calling delete on expression not allowed in strict mode", expr.start.line, expr.start.col, expr.start.pos); + break; + } + return new ctor({ operator: op, expression: expr }); + } + + var expr_op = function(left, min_prec, no_in) { + var op = is("operator") ? S.token.value : null; + if (op == "in" && no_in) op = null; + if (op == "**" && left instanceof AST_UnaryPrefix + /* unary token in front not allowed - parenthesis required */ + && !is_token(left.start, "punc", "(") + && left.operator !== "--" && left.operator !== "++") + unexpected(left.start); + var prec = op != null ? PRECEDENCE[op] : null; + if (prec != null && (prec > min_prec || (op === "**" && min_prec === prec))) { + next(); + var right = expr_op(maybe_unary(true), prec, no_in); + return expr_op(new AST_Binary({ + start : left.start, + left : left, + operator : op, + right : right, + end : right.end + }), min_prec, no_in); + } + return left; + }; + + function expr_ops(no_in) { + return expr_op(maybe_unary(true, true), 0, no_in); + } + + var maybe_conditional = function(no_in) { + var start = S.token; + var expr = expr_ops(no_in); + if (is("operator", "?")) { + next(); + var yes = expression(false); + expect(":"); + return new AST_Conditional({ + start : start, + condition : expr, + consequent : yes, + alternative : expression(false, no_in), + end : prev() + }); + } + return expr; + }; + + function is_assignable(expr) { + return expr instanceof AST_PropAccess || expr instanceof AST_SymbolRef; + } + + function to_destructuring(node) { + if (node instanceof AST_Object) { + node = new AST_Destructuring({ + start: node.start, + names: node.properties.map(to_destructuring), + is_array: false, + end: node.end + }); + } else if (node instanceof AST_Array) { + var names = []; + + for (var i = 0; i < node.elements.length; i++) { + // Only allow expansion as last element + if (node.elements[i] instanceof AST_Expansion) { + if (i + 1 !== node.elements.length) { + token_error(node.elements[i].start, "Spread must the be last element in destructuring array"); + } + node.elements[i].expression = to_destructuring(node.elements[i].expression); + } + + names.push(to_destructuring(node.elements[i])); + } + + node = new AST_Destructuring({ + start: node.start, + names: names, + is_array: true, + end: node.end + }); + } else if (node instanceof AST_ObjectProperty) { + node.value = to_destructuring(node.value); + } else if (node instanceof AST_Assign) { + node = new AST_DefaultAssign({ + start: node.start, + left: node.left, + operator: "=", + right: node.right, + end: node.end + }); + } + return node; + } + + // In ES6, AssignmentExpression can also be an ArrowFunction + var maybe_assign = function(no_in) { + handle_regexp(); + var start = S.token; + + if (start.type == "name" && start.value == "yield") { + if (is_in_generator()) { + next(); + return _yield_expression(); + } else if (S.input.has_directive("use strict")) { + token_error(S.token, "Unexpected yield identifier inside strict mode"); + } + } + + var left = maybe_conditional(no_in); + var val = S.token.value; + + if (is("operator") && ASSIGNMENT.has(val)) { + if (is_assignable(left) || (left = to_destructuring(left)) instanceof AST_Destructuring) { + next(); + + return new AST_Assign({ + start : start, + left : left, + operator : val, + right : maybe_assign(no_in), + logical : LOGICAL_ASSIGNMENT.has(val), + end : prev() + }); + } + croak("Invalid assignment"); + } + return left; + }; + + var expression = function(commas, no_in) { + var start = S.token; + var exprs = []; + while (true) { + exprs.push(maybe_assign(no_in)); + if (!commas || !is("punc", ",")) break; + next(); + commas = true; + } + return exprs.length == 1 ? exprs[0] : new AST_Sequence({ + start : start, + expressions : exprs, + end : peek() + }); + }; + + function in_loop(cont) { + ++S.in_loop; + var ret = cont(); + --S.in_loop; + return ret; + } + + if (options.expression) { + return expression(true); + } + + return (function parse_toplevel() { + var start = S.token; + var body = []; + S.input.push_directives_stack(); + if (options.module) S.input.add_directive("use strict"); + while (!is("eof")) { + body.push(statement()); + } + S.input.pop_directives_stack(); + var end = prev(); + var toplevel = options.toplevel; + if (toplevel) { + toplevel.body = toplevel.body.concat(body); + toplevel.end = end; + } else { + toplevel = new AST_Toplevel({ start: start, body: body, end: end }); + } + return toplevel; + })(); + +} + +export { + get_full_char_code, + get_full_char, + is_identifier_char, + is_basic_identifier_string, + is_identifier_string, + is_surrogate_pair_head, + is_surrogate_pair_tail, + js_error, + JS_Parse_Error, + parse, + PRECEDENCE, + RESERVED_WORDS, + tokenizer, +}; |