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introduce templates (#4603)

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This commit is contained in:
Alex Lam S.L
2021-02-01 09:20:13 +00:00
committed by GitHub
parent d4685640a0
commit ba6e29d6fd
9 changed files with 281 additions and 74 deletions
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93
lib/parse.js
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@@ -145,6 +145,43 @@ function is_identifier_string(str) {
return /^[a-z_$][a-z0-9_$]*$/i.test(str);
}
function decode_escape_sequence(seq) {
switch (seq[0]) {
case "b": return "\b";
case "f": return "\f";
case "n": return "\n";
case "r": return "\r";
case "t": return "\t";
case "u":
var code;
if (seq.length == 5) {
code = seq.slice(1);
} else if (seq[1] == "{" && seq.slice(-1) == "}") {
code = seq.slice(2, -1);
} else {
return;
}
var num = parseInt(code, 16);
if (num < 0 || isNaN(num)) return;
if (num < 0x10000) return String.fromCharCode(num);
if (num > 0x10ffff) return;
return String.fromCharCode((num >> 10) + 0xd7c0) + String.fromCharCode((num & 0x03ff) + 0xdc00);
case "v": return "\u000b";
case "x":
if (seq.length != 3) return;
var num = parseInt(seq.slice(1), 16);
if (num < 0 || isNaN(num)) return;
return String.fromCharCode(num);
case "\r":
case "\n":
return "";
default:
if (seq == "0") return "\0";
if (seq[0] >= "0" && seq[0] <= "9") return;
return seq;
}
}
function parse_js_number(num) {
var match;
if (match = RE_BIN_NUMBER.exec(num)) return parseInt(match[1], 2);
@@ -340,36 +377,23 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
}
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() != "{") return String.fromCharCode(hex_bytes(4));
next();
var num = 0;
do {
var digit = parseInt(next(true), 16);
if (isNaN(digit)) parse_error("Invalid hex-character pattern in string");
num = num * 16 + digit;
} while (peek() != "}");
next();
if (num < 0x10000) return String.fromCharCode(num);
if (num > 0x10ffff) parse_error("Invalid character code: " + num);
return String.fromCharCode((num >> 10) + 0xd7c0) + String.fromCharCode((num & 0x03ff) + 0xdc00);
case 13: // \r
// DOS newline
if (peek() == "\n") next(true, in_string);
case 10: return ""; // \n
var seq = next(true, in_string);
if (seq >= "0" && seq <= "7") return read_octal_escape_sequence(seq);
if (seq == "u") {
var ch = next(true, in_string);
seq += ch;
if (ch != "{") {
seq += next(true, in_string) + next(true, in_string) + next(true, in_string);
} else do {
ch = next(true, in_string);
seq += ch;
} while (ch != "}");
} else if (seq == "x") {
seq += next(true, in_string) + next(true, in_string);
}
if (ch >= "0" && ch <= "7")
return read_octal_escape_sequence(ch);
return ch;
var str = decode_escape_sequence(seq);
if (typeof str != "string") parse_error("Invalid escape sequence: \\" + seq);
return str;
}
function read_octal_escape_sequence(ch) {
@@ -388,17 +412,6 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
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 (;;) {