diff options
Diffstat (limited to 'lib/parse.js')
| -rw-r--r-- | lib/parse.js | 93 |
1 files changed, 31 insertions, 62 deletions
diff --git a/lib/parse.js b/lib/parse.js index b7639df4..7321878f 100644 --- a/lib/parse.js +++ b/lib/parse.js @@ -234,6 +234,7 @@ function tokenizer($TEXT, filename, html5_comments, shebang) { directives : {}, directive_stack : [] }; + var prev_was_dot = false; function peek() { return S.text.charAt(S.pos); @@ -286,16 +287,12 @@ function tokenizer($TEXT, filename, html5_comments, shebang) { 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])); - if (type == "punc" && value == ".") { - prev_was_dot = true; - } else if (!is_comment) { - prev_was_dot = false; - } + S.regex_allowed = type == "operator" && !UNARY_POSTFIX[value] + || type == "keyword" && KEYWORDS_BEFORE_EXPRESSION[value] + || type == "punc" && PUNC_BEFORE_EXPRESSION[value]; + if (type == "punc" && value == ".") prev_was_dot = true; + else if (!is_comment) prev_was_dot = false; var ret = { type : type, value : value, @@ -358,11 +355,8 @@ function tokenizer($TEXT, filename, html5_comments, shebang) { parse_error("Legacy octal literals are not allowed in strict mode"); } var valid = parse_js_number(num); - if (!isNaN(valid)) { - return token("num", valid); - } else { - parse_error("Invalid syntax: " + num); - } + if (!isNaN(valid)) return token("num", valid); + parse_error("Invalid syntax: " + num); } function read_escaped_char(in_string) { @@ -463,8 +457,7 @@ function tokenizer($TEXT, filename, html5_comments, shebang) { if (ch == "\\") escaped = backslash = true, next(); else if (is_identifier_char(ch)) name += next(); else break; - } - else { + } else { if (ch != "u") parse_error("Expecting UnicodeEscapeSequence -- uXXXX"); ch = read_escaped_char(); if (!is_identifier_char(ch)) parse_error("Unicode char: " + ch.charCodeAt(0) + " is not valid in identifier"); @@ -538,9 +531,7 @@ function tokenizer($TEXT, filename, html5_comments, shebang) { function handle_dot() { next(); - return is_digit(peek().charCodeAt(0)) - ? read_num(".") - : token("punc", "."); + return is_digit(peek().charCodeAt(0)) ? read_num(".") : token("punc", "."); } function read_word() { @@ -592,11 +583,10 @@ function tokenizer($TEXT, filename, html5_comments, shebang) { 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 47: + var tok = handle_slash(); + if (tok === next_token) continue; + return tok; } if (is_digit(code)) return read_num(); if (PUNC_CHARS[ch]) return token("punc", next()); @@ -614,12 +604,8 @@ function tokenizer($TEXT, filename, html5_comments, shebang) { next_token.add_directive = function(directive) { S.directive_stack[S.directive_stack.length - 1].push(directive); - - if (S.directives[directive] === undefined) { - S.directives[directive] = 1; - } else { - S.directives[directive]++; - } + if (S.directives[directive]) S.directives[directive]++; + else S.directives[directive] = 1; } next_token.push_directives_stack = function() { @@ -627,13 +613,10 @@ function tokenizer($TEXT, filename, html5_comments, shebang) { } next_token.pop_directives_stack = function() { - var directives = S.directive_stack[S.directive_stack.length - 1]; - - for (var i = 0; i < directives.length; i++) { + var directives = S.directive_stack.pop(); + for (var i = directives.length; --i >= 0;) { S.directives[directives[i]]--; } - - S.directive_stack.pop(); } next_token.has_directive = function(directive) { @@ -645,27 +628,17 @@ function tokenizer($TEXT, filename, html5_comments, shebang) { /* -----[ Parser (constants) ]----- */ -var UNARY_PREFIX = makePredicate([ - "typeof", - "void", - "delete", - "--", - "++", - "!", - "~", - "-", - "+" -]); +var UNARY_PREFIX = makePredicate("typeof void delete -- ++ ! ~ - +"); -var UNARY_POSTFIX = makePredicate([ "--", "++" ]); +var UNARY_POSTFIX = makePredicate("-- ++"); -var ASSIGNMENT = makePredicate([ "=", "+=", "-=", "/=", "*=", "%=", ">>=", "<<=", ">>>=", "|=", "^=", "&=" ]); +var ASSIGNMENT = makePredicate("= += -= /= *= %= >>= <<= >>>= |= ^= &="); var PRECEDENCE = function(a, ret) { - for (var i = 0; i < a.length; ++i) { - var b = a[i]; - for (var j = 0; j < b.length; ++j) { - ret[b[j]] = i + 1; + for (var i = 0; i < a.length;) { + var b = a[i++]; + for (var j = 0; j < b.length; j++) { + ret[b[j]] = i; } } return ret; @@ -682,7 +655,7 @@ var PRECEDENCE = function(a, ret) { ["*", "/", "%"] ], {}); -var ATOMIC_START_TOKEN = makePredicate([ "atom", "num", "string", "regexp", "name" ]); +var ATOMIC_START_TOKEN = makePredicate("atom num string regexp name"); /* -----[ Parser ]----- */ @@ -698,10 +671,9 @@ function parse($TEXT, options) { }, true); var S = { - input : (typeof $TEXT == "string" - ? tokenizer($TEXT, options.filename, - options.html5_comments, options.shebang) - : $TEXT), + input : typeof $TEXT == "string" + ? tokenizer($TEXT, options.filename, options.html5_comments, options.shebang) + : $TEXT, token : null, prev : null, peeked : null, @@ -757,15 +729,12 @@ function parse($TEXT, options) { } function unexpected(token) { - if (token == null) - token = S.token; + if (token == null) token = S.token; token_error(token, "Unexpected token: " + token_to_string(token.type, token.value)); } function expect_token(type, val) { - if (is(type, val)) { - return next(); - } + if (is(type, val)) return next(); token_error(S.token, "Unexpected token: " + token_to_string(S.token.type, S.token.value) + ", expected: " + token_to_string(type, val)); } |