shift-spidermonkey-converter
Version:
convert ASTs between Shift and SpiderMonkey formats
139 lines (132 loc) • 14 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = cook;
/**
* Copyright 2016 Shape Security, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License")
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// Exports a single function which "cooks" template strings, i.e. interprets any escape sequences and converts \r\n into \n.
// Adapted from shift-parser's scanStringEscape
function getHexValue(rune) {
if ("0" <= rune && rune <= "9") {
return rune.charCodeAt(0) - 48;
}
if ("a" <= rune && rune <= "f") {
return rune.charCodeAt(0) - 87;
}
if ("A" <= rune && rune <= "F") {
return rune.charCodeAt(0) - 55;
}
return -1;
}
function isLineTerminator(cp) {
return cp === 0x0A || cp === 0x0D || cp === 0x2028 || cp === 0x2029;
}
function fromCodePoint(cp) {
if (cp <= 0xFFFF) return String.fromCharCode(cp);
var cu1 = String.fromCharCode(Math.floor((cp - 0x10000) / 0x400) + 0xD800);
var cu2 = String.fromCharCode((cp - 0x10000) % 0x400 + 0xDC00);
return cu1 + cu2;
}
function cook(source) {
// convert a TemplateCharacters into its Template Value
// https://tc39.github.io/ecma262/#sec-static-semantics-tv-and-trv
var str = "";
for (var index = 0; index < source.length; ++index) {
var ch = source.charAt(index);
if (ch === "\\") {
ch = source.charAt(++index);
if (!isLineTerminator(ch.charCodeAt(0))) {
switch (ch) {
case "n":
str += "\n";
break;
case "r":
str += "\r";
break;
case "t":
str += "\t";
break;
case "u":
case "x":
var unescaped = void 0;
index++;
if (ch === "u") {
if (source.charAt(index) === "{") {
//\u{HexDigits}
var i = index + 1;
var hexDigits = 0,
_ch = void 0;
while (i < source.length) {
_ch = source.charAt(i);
var hex = getHexValue(_ch);
if (hex === -1) {
break;
}
hexDigits = hexDigits << 4 | hex;
i++;
}
index = i;
unescaped = hexDigits;
} else {
//\uHex4Digits
var r1 = getHexValue(source.charAt(index));
var r2 = getHexValue(source.charAt(index + 1));
var r3 = getHexValue(source.charAt(index + 2));
var r4 = getHexValue(source.charAt(index + 3));
index += 3;
unescaped = r1 << 12 | r2 << 8 | r3 << 4 | r4;
}
} else {
var _r = getHexValue(source.charAt(index));
var _r2 = getHexValue(source.charAt(index + 1));
index++;
unescaped = _r << 4 | _r2;
}
str += fromCodePoint(unescaped);
break;
case "b":
str += "\b";
break;
case "f":
str += "\f";
break;
case "v":
str += "\x0B";
break;
case "0":
str += "\0";
break;
default:
str += ch;
}
} else {
if (ch === "\r" && source.charAt(index + 1) === "\n") {
index++;
}
}
} else if (isLineTerminator(ch.charCodeAt(0))) {
if (ch === "\r" && source.charAt(index + 1) === "\n") {
index++;
}
str += "\n";
} else {
str += ch;
}
}
return str;
}
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index < source.length; ++index) {\n    let ch = source.charAt(index);\n    if (ch === \"\\\\\") {\n      ch = source.charAt(++index);\n      if (!isLineTerminator(ch.charCodeAt(0))) {\n        switch (ch) {\n          case \"n\":\n            str += \"\\n\";\n            break;\n          case \"r\":\n            str += \"\\r\";\n            break;\n          case \"t\":\n            str += \"\\t\";\n            break;\n          case \"u\":\n          case \"x\":\n            let unescaped;\n            index++;\n            if (ch === \"u\") {\n              if (source.charAt(index) === \"{\") {\n                //\\u{HexDigits}\n                let i = index + 1;\n                let hexDigits = 0, ch;\n                while (i < source.length) {\n                  ch = source.charAt(i);\n                  let hex = getHexValue(ch);\n                  if (hex === -1) {\n                    break;\n                  }\n                  hexDigits = (hexDigits << 4) | hex;\n                  i++;\n                }\n                index = i;\n                unescaped = hexDigits;\n              } else {\n                //\\uHex4Digits\n                let r1 = getHexValue(source.charAt(index));\n                let r2 = getHexValue(source.charAt(index + 1));\n                let r3 = getHexValue(source.charAt(index + 2));\n                let r4 = getHexValue(source.charAt(index + 3));\n                index += 3;\n                unescaped = r1 << 12 | r2 << 8 | r3 << 4 | r4;\n              }\n            } else {\n              let r1 = getHexValue(source.charAt(index));\n              let r2 = getHexValue(source.charAt(index + 1));\n              index++;\n              unescaped = r1 << 4 | r2;\n            }\n            str += fromCodePoint(unescaped);\n            break;\n          case \"b\":\n            str += \"\\b\";\n            break;\n          case \"f\":\n            str += \"\\f\";\n            break;\n          case \"v\":\n            str += \"\\u000B\";\n            break;\n          case \"0\":\n            str += \"\\0\";\n            break;\n          default:\n            str += ch;\n        }\n      } else {\n        if (ch === \"\\r\" && source.charAt(index + 1) === \"\\n\") {\n          index++;\n        }\n      }\n    } else if (isLineTerminator(ch.charCodeAt(0))) {\n      if (ch === \"\\r\" && source.charAt(index + 1) === \"\\n\") {\n        index++;\n      }\n      str += \"\\n\";\n    } else {\n      str += ch;\n    }\n  }\n  return str;\n}\n"]}