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compileDataView.js
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/*
* Copyright (c) 2021-2025 Moddable Tech, Inc.
*
* This file is part of the Moddable SDK Tools.
*
* The Moddable SDK Tools is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The Moddable SDK Tools is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with the Moddable SDK Tools. If not, see <http://www.gnu.org/licenses/>.
*/
/*
to do:
- bitfields that align to byte and are a multiple of 8 in size special case
- faster generated code for set of embedded views
- initializers
- ViewArray doesn't work with JSON
*/
const Version = 3;
const byteCounts = {
Int8: 1,
Int16: 2,
Int32: 4,
Uint8: 1,
Uint16: 2,
Uint32: 4,
Float16: 2,
Float32: 4,
Float64: 8,
BigInt64: 8,
BigUint64: 8
};
const shiftCounts = {
Int8: 0,
Int16: 1,
Int32: 2,
Uint8: 0,
Uint16: 1,
Uint32: 2,
Float16: 1,
Float32: 2,
Float64: 3,
BigInt64: 3,
BigUint64: 3
};
const TypeAliases = {
uint8_t: "Uint8",
uint16_t: "Uint16",
uint32_t: "Uint32",
uint64_t: "BigUint64",
int8_t: "Int8",
int16_t: "Int16",
int32_t: "Int32",
int64_t: "BigInt64",
float16_t: "Float16",
float32_t: "Float32",
float64_t: "Float64",
float: "Float32",
double: "Float64",
boolean: "Boolean",
bool: "Boolean"
};
const TypeScriptTypeAliases = {
Uint8: "number",
Uint16: "number",
Uint32: "number",
BigUint64: "bigint",
Int8: "number",
Int16: "number",
Int32: "number",
BigInt64: "bigint",
Float16: "number",
Float32: "number",
Float64: "number",
Boolean: "boolean"
}
const isTypedef = Symbol("typedef");
const anonymous = Symbol("anonymous");
let className;
let superClassName;
let classUsesEndian;
let output;
let classes;
let properties;
let bitfields;
let jsonOutput;
let fromOutput;
let byteOffset;
let littleEndian;
let hostEndian
let useEndian; // = littleEndian ?? hostEndian
let language;
let platform;
let doSet;
let doGet;
let doExport;
let pack;
let extendsClass;
let imports;
let outputByteLength;
let checkByteLength;
let union;
let enumState;
let enums;
let enumContext;
let classAlign;
let anonymousUnion;
let json;
let bitfieldsLSB;
let comments;
let jsdocComment;
let jsdocClassComment;
let header;
let usesText;
let usesEndianProxy;
let usesViewArray;
let conditionals;
let final;
let paddingPrefix;
let injectInterface;
let exports;
let outputSource;
class Output extends Array {
add(line) {
if ("object" === typeof line) {
line = line[language];
if (undefined === line)
throw new Error(`no generated code for ${language}`);
}
if (line.length) this.push(line);
}
push(value, etc) {
if (etc) throw new Error("unexpected");
if (undefined === value)
return;
super.push(value);
}
}
const hex = "0123456789ABCDEF";
function toHex(value, byteCount = 4) {
let result = "";
let nybbles = byteCount * 2;
while (value && nybbles--) {
result = hex[value & 15] + result;
value = (value & 0xFFFFFFF0) >>> 4;
}
return "0x" + (("" === result) ? "0" : result);
}
function booleanSetting(value, name) {
if ("true" === value)
return true;
if ("false" === value)
return false;
throw new Error(`invalid ${name} "${value}" specified`);
}
function endField(byteCount) {
if (undefined !== union)
union = Math.max(byteCount, union);
else
byteOffset += byteCount;
}
function validateName(name) {
//@@ naive
const c = name.charCodeAt(0);
if ((48 <= c) && (c < 58))
throw new Error(`invalid name "${name}"`);
if (name.includes(";") || name.includes("+") || name.includes("-") || name.includes(".") || name.includes("&"))
throw new Error(`invalid name "${name}"`);
return name;
}
function splitSource(source) {
let parts = [], part = "";
let map = [];
let line = 1;
let directive = false, lineStart = true;
let error;
splitLoop:
for (let i = 0, length = source.length; i < length; i++) {
const c = source[i]
if ("\n" === c)
lineStart = true;
switch (c) {
case "*":
if ("/" === part) {
part = "";
const endComment = source.indexOf("*/", i);
if (endComment < 0) {
error = `unterminated comment, line ${line}`;
break splitLoop;
}
parts.push(source.slice(i - 1, endComment + 2));
map.push(line);
line += source.slice(i, endComment).split("\n").length - 1;
i = endComment + 1; // with ++ in for loop, this gives next character
continue splitLoop;
}
// fall through to handle "*" as separate part
case "|":
case "&":
case "=":
if (part) {
parts.push(part);
map.push(line);
}
if (c === source[i + 1]) {
parts.push(c + c);
i += 1;
}
else
parts.push(c);
map.push(line);
part = "";
break;
case "{":
case "}":
case ":":
case ";":
case "[":
case "]":
case "(":
case ")":
case "+":
case "-":
case "^":
case "!":
case ",":
if (part) {
parts.push(part);
map.push(line);
}
parts.push(c);
map.push(line);
part = "";
break;
case "\n":
case "\t":
case " ":
if (part) {
parts.push(part);
map.push(line);
}
if ("\n" === c) {
if (directive) {
directive = false;
parts.push(c);
map.push(line);
}
line += 1;
}
part = "";
break;
case "/":
if ("/" === part) {
part = "";
i = source.indexOf("\n", i);
if (i < 0)
break splitLoop;
i -= 1; // so line ending is parsed
continue splitLoop;
}
part += c;
break;
case "#":
if (lineStart)
directive = true;
part += c;
break;
default:
part += c;
break;
}
if ((" " !== c) && ("\t" !== c) && ("\n" !== c))
lineStart = false;
}
if (part) {
parts.push(part);
map.push(line);
}
return {parts, map, error};
}
function flushBitfields(bitsToAdd = 32) {
let total = 0, type, endian, byteCount;
for (let i = 0; i < bitfields.length; i++)
total += bitfields[i].bitCount;
if ((0 == total) || ((total + bitsToAdd) <= 32))
return;
if (total <= 8) {
type = "Uint8";
byteCount = 1;
endian = "";
}
else {
type = (total <= 16) ? "Uint16" : "Uint32";
byteCount = (total <= 16) ? 2 : 4;
endian = useEndian ? ", true" : ", false";
}
let bitsOutput = 0;
while (bitfields.length) {
const bitfield = bitfields.shift();
const bitOffset = bitfieldsLSB ? bitsOutput : ((byteCount << 3) - bitsOutput - bitfield.bitCount);
const mask = (2 ** bitfield.bitCount) - 1;
const shiftLeft = bitOffset ? " << " + bitOffset : "";
const shiftRight = bitOffset ? " >> " + bitOffset : "";
if (doGet && !bitfield.name.startsWith(paddingPrefix)) {
if (bitfield.jsdocComment)
output.push(bitfield.jsdocComment);
output.add({
javascript: ` get ${bitfield.name}() {`,
typescript: ` get ${bitfield.name}(): ${bitfield.boolean ? "boolean" : "number"} {`,
});
if (bitfield.boolean)
output.push(` return Boolean(this.get${type}(${byteOffset}${endian}) & ${toHex(mask << bitOffset, byteCount)});`);
else
output.push(` return (this.get${type}(${byteOffset}${endian})${shiftRight}) & ${toHex(mask, byteCount)};`);
output.push(` }`);
}
if (doSet && !bitfield.name.startsWith(paddingPrefix)) {
output.push(bitfield.jsdocComment);
output.add({
javascript: ` set ${bitfield.name}(value) {`,
typescript: ` set ${bitfield.name}(value: ${bitfield.boolean ? "boolean" : "number"}) {`,
});
if (bitfield.boolean) {
output.push(` const t = this.get${type}(${byteOffset}${endian});`);
output.push(` this.set${type}(${byteOffset}, value ? (t | ${toHex(1 << bitOffset)}) : (t & ${toHex(~(mask << bitOffset), byteCount)})${endian});`);
}
else if (1 === bitfield.bitCount) {
output.push(` const t = this.get${type}(${byteOffset}${endian});`);
output.push(` this.set${type}(${byteOffset}, (value & 1) ? (t | ${toHex(1 << bitOffset)}) : (t & ${toHex(~(mask << bitOffset), byteCount)})${endian});`);
}
else {
output.push(` const t = this.get${type}(${byteOffset}${endian}) & ${toHex(~(mask << bitOffset), byteCount)};`);
output.push(` this.set${type}(${byteOffset}, t | ((value & ${toHex(mask, byteCount)})${shiftLeft})${endian});`);
}
output.push(` }`);
}
bitsOutput += bitfield.bitCount;
}
bitfields.length = 0;
endField(byteCount);
}
function setPragma(setting, value) {
switch (setting) {
case "extends":
extendsClass = value ? validateName(value) : "DataView"
break;
case "endian":
if ("little" === value)
littleEndian = true;
else if ("big" === value)
littleEndian = false;
else if ("host" === value)
littleEndian = undefined;
else
throw new Error(`invalid endian "${value}" specified`);
useEndian = littleEndian ?? hostEndian;
break;
case "hostEndian":
if (output.length || final.length || className)
throw new Error("too late to set hostEndian");
if ("little" === value)
hostEndian = true;
else if ("big" === value)
hostEndian = false;
else if ("unknown" === value)
hostEndian = undefined;
else
throw new Error(`invalid hostEndian "${value}" specified`);
useEndian = littleEndian ?? hostEndian;
break;
case "pack":
if (")" === value) {
value = kDefaultPack;
pos -= 1;
}
else {
value = parseInt(value);
if (0 === value)
value = kDefaultPack;
if (![1, 2, 4, 8, 16].includes(value))
throw new Error(`invalid pack`);
}
pack = value;
break;
case "language":
if (output.length || final.length || className)
throw new Error("too late to set language");
const languageParts = value.split('/');
if (languageParts.length < 1 || languageParts.length > 2)
throw new Error(`invalid language "${value}" specified; missing <language>{/<platform>}`);
if (!["javascript", "typescript"].includes(languageParts[0]))
throw new Error(`invalid language "${value}" specified; language "${languageParts[0]}" unknown`);
if (2 == languageParts.length && !["xs", "node", "web"].includes(languageParts[1]))
throw new Error(`invalid language "${value}" specified; platform "${languageParts[1]}" unknown`);
language = languageParts[0];
platform = languageParts[1] ?? "xs";
break;
case "set":
doSet = booleanSetting(value, setting);
break;
case "get":
doGet = booleanSetting(value, setting);
break;
case "export":
doExport = booleanSetting(value, setting);
break;
case "outputByteLength":
outputByteLength = booleanSetting(value, setting);
break;
case "checkByteLength":
checkByteLength = booleanSetting(value, setting);
break;
case "json":
json = booleanSetting(value, setting);
break;
case "bitfields":
if ("lsb" === value)
bitfieldsLSB = true;
else if ("msb" === value)
bitfieldsLSB = false;
else
throw new Error(`invalid bitfields "${value}" specified`);
break;
case "comments":
if (!["header", "false", "true"].includes(value))
throw new Error(`invalid comments "${value}" specified`);
comments = value;
break;
case "inject":
if (jsdocClassComment) {
final.push(jsdocClassComment);
jsdocClassComment = "";
}
final.push(`${className ? ' ' : ''}${value};`);
break;
case "injectInterface":
injectInterface.push(` ${value};`);
break;
case "import":
imports.push(`import ${value};`);
break;
case "outputSource":
outputSource = booleanSetting(value, setting);
break;
default:
throw new Error(`unknown pragma "${setting}"`);
break;
}
}
const kDefaultPack = 16;
function compileDataView(input, pragmas = {}) {
className = undefined;
superClassName = undefined;
classUsesEndian = false;
output = new Output;
properties = [];
classes = {};
bitfields = [];
jsonOutput = new Output;
fromOutput = new Output;
byteOffset = 0;
littleEndian = undefined;
hostEndian = true;
useEndian = littleEndian ?? hostEndian
language = "javascript";
platform = "xs";
doSet = true;
doGet = true;
doExport = true;
pack = kDefaultPack;
extendsClass = "DataView";
imports = [];
outputByteLength = false;
checkByteLength = true;
union = undefined;
enumState = undefined;
enums = new Set;
enumContext = "";
classAlign = 0;
anonymousUnion = false;
json = false;
bitfieldsLSB = true;
comments = "header";
jsdocComment = undefined;
jsdocClassComment = undefined;
header = "";
usesText = false;
usesEndianProxy = false;
usesViewArray = false;
conditionals = [{active: true, else: true}];
paddingPrefix = "__pad";
injectInterface = [];
exports = [];
outputSource = true;
final = [];
const errors = [];
const lines = input.split("\n");
const {parts, map, error} = splitSource(input);
if (error) {
errors.push(` ${error}`);
parts.length = 0;
}
for (const name in pragmas)
setPragma(name, pragmas[name]);
for (let pos = 0; pos < parts.length; ) {
const part = parts[pos++];
if (!part)
throw new Error("unexpected state");
try {
let bitCount, arrayCount;
if (!conditionals[conditionals.length - 1].active) {
if (("#if" !== part) && ("#else" !== part) && ("#endif" !== part))
continue;
}
if ("}" == part) {
if (!className)
throw new Error(`unexpected }`);
flushBitfields();
if (undefined !== union) {
if (0 === union)
throw new Error(`empty union`);
const byteLength = union;
union = undefined;
endField(byteLength);
if (anonymousUnion) {
anonymousUnion = false;
if (";" !== parts[pos++])
throw new Error(`expected semicolon`);
continue;
}
}
else if (undefined !== enumState) {
if (anonymous !== className) {
exports.push(className);
output.add({
javascript: `const ${className} = Object.freeze({`,
typescript: `enum ${className} {`,
});
for (let [name, { value, jsdocComment }] of enumState) {
output.push(jsdocComment);
if ("string" === typeof value)
value = '"' + value + '"';
output.add({
javascript: ` ${name}: ${value},`,
typescript: ` ${name} = ${value},`,
});
}
output.add({
javascript: `});`,
typescript: `}`,
});
output.push(``);
final = final.concat(output);
output.length = 0;
const enumBackingType = TypeAliases[enumState.backingType];
const enumBackingBytes = byteCounts[enumBackingType];
classes[className] = {
byteLength: enumBackingBytes,
align: Math.min(pack, enumBackingBytes),
alignLength: enumBackingBytes
};
TypeAliases[className] = enumBackingType;
}
enumState = undefined;
className = undefined;
classUsesEndian = false;
continue;
}
if (isTypedef === className) {
className = validateName(parts[pos++]);
if (classes[className])
throw new Error(`duplicate class "${className}"`);
}
if (";" !== parts[pos++])
throw new Error(`expected semicolon`);
if (json && byteOffset) {
if (doGet) {
output.add({
javascript: ` toJSON() {`,
typescript: ` toJSON(): object {`
});
output.push(` return {`);
output = output.concat(jsonOutput);
if (superClassName)
output.push(` ...super.toJSON()`);
output.push(` };`);
output.push(` }`);
}
jsonOutput.length = 0;
if (doSet) {
let interfaceTypes = `I${className}`;
for (let parentClass = superClassName; parentClass; parentClass = classes[parentClass]?.superClassName)
interfaceTypes += ` & I${parentClass}`;
output.add({
javascript: ` static from(obj) {`,
typescript: ` static from(obj: ${interfaceTypes}): ${className} {`
});
if (superClassName)
output.add({
javascript: ` const result = super.from(obj);`,
typescript: ` const result = <${className}> super.from(obj);`
});
else
output.push(` const result = new this();`);
output = output.concat(fromOutput.map(e => e.replace("##LATE_CAST##", className)));
output.push(` return result;`);
output.push(` }`);
}
fromOutput.length = 0;
}
output.push(`}`);
output.push(``);
const start = new Output;
if ("typescript" == language) {
exports.push("I" + className);
start.push(jsdocClassComment);
if (injectInterface.length == 0)
start.push(`type I${className} = Omit<${className}, keyof DataView | "toJSON">;`);
else {
start.push(`interface I${className} extends Omit<${className}, keyof DataView | "toJSON"> {`);
injectInterface.forEach((inject) => start.push(inject));
start.push(`}`);
injectInterface = [];
}
}
start.push(jsdocClassComment);
exports.push(className);
start.push(`class ${className} extends ${superClassName ?? extendsClass} {`);
jsdocClassComment = undefined;
let superByteLength = 0;
for (let parentClass = superClassName; classes[parentClass]; parentClass = classes[parentClass].extendsClass)
superByteLength += classes[parentClass].byteLength;
if (outputByteLength)
start.push(` static byteLength = ${byteOffset}`);
if (classUsesEndian)
start.push(` #endian;`);
if (outputByteLength || classUsesEndian)
start.push(``);
if (byteOffset > 0) {
start.add({
javascript: ` constructor(data, offset = 0, length = ${byteOffset}) {`,
typescript: ` constructor(data?: ArrayBufferLike, offset = 0, length = ${byteOffset}) {`
});
if (!superClassName)
start.push(` super(data ?? new ArrayBuffer(offset + length), offset${checkByteLength ? ", length" : ""})`);
else
start.push(` super(data, offset, length);`);
if (classUsesEndian) {
start.push(` this.setUint8(0, 1);`);
start.push(` this.#endian = 1 === this.getUint16(0, true);`);
start.push(` this.setUint8[0] = 0;`);
}
start.push(` }`);
}
final = final.concat(start, output);
classes[className] = {
byteLength: byteOffset,
align: classAlign,
alignLength: Math.ceil(byteOffset / classAlign) * classAlign,
superClassName,
superByteLength
};
output.length = 0;
byteOffset = 0;
properties.length = 0;
className = undefined;
classAlign = 0;
superClassName = undefined;
continue;
}
if ((part === "union") && ("{" === parts[pos])) {
if (!className)
throw new Error(`anonymous union must be in struct`);
if (undefined !== union)
throw new Error(`no nested unions`);
union = 0;
anonymousUnion = true;
pos += 1;
continue;
}
if (part === "union") {
if ("{" !== parts[pos + 1])
throw new Error(`open brace expected`);
className = validateName(parts[pos]);
if (classes[className])
throw new Error(`duplicate class "${className}"`);
classAlign = 1;
union = 0;
anonymousUnion = false;
pos += 2;
continue;
}
if (part === "enum") {
if (className)
throw new Error(`enum must be at root`);
let backingType = 'int32_t';
if ("{" !== parts[pos]) {
className = validateName(parts[pos++]);
if (classes[className])
throw new Error(`duplicate name "${enumState.name}"`);
if (':' == parts[pos]) {
backingType = parts[pos + 1];
if (!TypeAliases[backingType])
throw new Error(`unknown enum type ${backingType}`);
pos += 2;
}
}
else
className = anonymous;
enumState = new Map;
enumState.value = -1;
enumState.backingType = backingType;
if ("{" !== parts[pos++])
throw new Error(`open brace expected`);
continue;
}
if (("typedef" === part) && (("struct" === parts[pos]) || (("volatile" == parts[pos]) && ("struct" === parts[pos + 1])))) {
if (className)
throw new Error(`cannot nest structure`);
if ("volatile" == parts[pos])
pos += 1;
if ("{" !== parts[pos + 1])
throw new Error(`open brace expected`);
className = isTypedef;
classAlign = 1;
jsonOutput = new Output;
fromOutput = new Output;
pos += 2;
continue;
}
if ("struct" === part) {
if (className)
throw new Error(`cannot nest structure`);
className = validateName(parts[pos]);
if (classes[className])
throw new Error(`duplicate class "${className}"`);
if (":" == parts[pos + 1]) {
superClassName = parts[pos + 2];
if (!classes[superClassName])
throw new Error(`unknown super class "${superClassName}"`)
byteOffset = classes[superClassName].byteLength;
}
if ("{" !== parts[pos + (superClassName ? 3 : 1)])
throw new Error(`open brace expected`);
classAlign = 1;
jsonOutput = new Output;
fromOutput = new Output;
pos += (superClassName ? 4 : 2);
continue;
}
if (part.startsWith("/*")) {
if (("header" === comments) && (1 === pos))
header = part;
else if ("true" === comments) {
if (part.startsWith('/**')) {
if (className)
jsdocComment = ' ' + part;
else
jsdocClassComment = '\n' + part;
}
else {
if (className)
output.push(' ' + part);
else
final.push(part);
}
}
continue;
}
if ("#pragma" === part) {
const setting = parts[pos++];
if ("(" !== parts[pos++])
throw new Error(`open parenthesis expected`);
let value = [];
let nest = 0;
while (true) {
const part = parts[pos++];
if ("\n" === part)
throw new Error(`unbalanced parenthesis`);
if ("(" === part)
nest++;
else if (")" === part) {
if (0 === nest) {
pos--;
break;
}
nest--;
}
value.push(part);
}
value = value.join(" ");
setPragma(setting, value);
if (")" !== parts[pos++])
throw new Error(`close parenthesis expected`);
if ("\n" !== parts[pos++])
throw new Error(`end of line expected`);
continue;
}
if ("#if" === part) {
const end = parts.indexOf("\n", pos);
if (-1 == end)
throw new Error(`syntax error`);
if (!conditionals[conditionals.length - 1].active)
conditionals.push({active: false});
else {
const expression = parts.slice(pos, end).join(" ");
let f = new Function(`
const p = new Proxy({}, {
has(target, property) {
return "defined" !== property;
},
get(target, property) {
if ("__COMPILEDATAVIEW__" == property)
return "${Version}";
if ("__LANGUAGE_${language.toUpperCase()}__" == property)
return true;
if ("__PLATFORM_${platform.toUpperCase()}__" == property)
return true;
return undefined;
}
});
const defined = function(t) {return undefined !== t};
with (p) {
return ${expression};
}
`);
const active = f() ?? false;
const type = typeof active;
if (("boolean" !== type) && ("number" !== type))
throw new Error(`invalid value for ${expression}`);
conditionals.push({active: !!active});
}
pos = end + 1;
continue;
}
if ("#else" === part) {
if ((conditionals.length < 2) || conditionals[conditionals.length - 1].else)
throw new Error(`unmatched #else`);
if (conditionals[conditionals.length - 2].active) {
conditionals[conditionals.length - 1].active = !conditionals[conditionals.length - 1].active;
conditionals[conditionals.length - 1].else = true;
}
const end = parts.indexOf("\n", pos);
if (-1 !== end)
pos = end + 1;
continue;
}
if ("#endif" === part) {
if (conditionals.length < 2)
throw new Error(`unmatched #endif`);
conditionals.pop();
const end = parts.indexOf("\n", pos);