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minor tweaks (#3502)

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This commit is contained in:
Alex Lam S.L
2019-10-20 15:19:19 +08:00
committed by GitHub
parent ca6dce43fe
commit 9199ab5846
4 changed files with 40 additions and 78 deletions
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93
lib/parse.js
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@@ -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));
}