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compileDataView.js
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/*
* Copyright (c) 2021-2022 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
*/
const Version = 1;
const byteCounts = {
Int8: 1,
Int16: 2,
Int32: 4,
Uint8: 1,
Uint16: 2,
Uint32: 4,
Float32: 4,
Float64: 8,
BigInt64: 8,
BigUint64: 8
};
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",
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",
Float32: "number",
Float64: "number",
Boolean: "boolean"
}
const isTypedef = Symbol("typedef");
let className;
let output;
let classes;
let properties;
let bitfields;
let jsonOutput;
let fromOutput;
let byteOffset;
let littleEndian;
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 enumContext;
let classAlign;
let anonymousUnion;
let json;
let bitfieldsLSB;
let comments;
let header;
let usesText;
let conditionals;
let final;
let paddingPrefix;
class Output extends Array {
add(line) {
if ("object" === typeof line) {
line = line[language];
if (undefined === line)
throw new Error(`no generated code for ${language}`);
}
this.push(line);
}
}
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 = littleEndian ? ", 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)) {
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.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})${endian});`);
}
output.push(` }`);
}
bitsOutput += bitfield.bitCount;
}
bitfields.length = 0;
endField(byteCount);
}
function setPragma(setting, value) {
switch (setting) {
case "extends":
extendsClass = value ? validateName(value) : "DataView"
break;
case "endian":
if ("little" === value)
littleEndian = true;
else if ("big" === value)
littleEndian = false;
else
throw new Error(`invalid endian "${value}" specified`);
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 "import":
imports.push(`import ${value};`);
break;
default:
throw new Error(`unknown pragma "${setting}"`);
break;
}
}
const kDefaultPack = 16;
function compileDataView(input, pragmas = {}) {
className = undefined;
output = new Output;
properties = [];
classes = {};
bitfields = [];
jsonOutput = new Output;
fromOutput = new Output;
byteOffset = 0;
littleEndian = true;
language = "javascript";
platform = "xs";
doSet = true;
doGet = true;
doExport = true;
pack = kDefaultPack;
extendsClass = "DataView";
imports = [];
outputByteLength = false;
checkByteLength = true;
union = undefined;
enumState = undefined;
enumContext = "";
classAlign = 0;
anonymousUnion = false;
json = false;
bitfieldsLSB = true;
comments = "header";
header = "";
usesText = false;
conditionals = [{active: true, else: true}];
paddingPrefix = "__pad";
final = [];
const errors = [];
const lines = input.split("\n");
const {parts, map, error} = splitSource(input);
if (error) {
errors.push(` ${error}`);
parts.length = 0;
}
for (const name in pragmas)
setPragma(name, pragmas[name]);
for (let pos = 0; pos < parts.length; ) {
const part = parts[pos++];
if (!part)
throw new Error("unexpected state");
try {
let bitCount, arrayCount;
if (!conditionals[conditionals.length - 1].active) {
if (("#if" !== part) && ("#else" !== part) && ("#endif" !== part))
continue;
}
if ("}" == part) {
if (!className)
throw new Error(`unexpected }`);
flushBitfields();
if (undefined !== union) {
if (0 === union)
throw new Error(`empty union`);
const byteLength = union;
union = undefined;
endField(byteLength);
if (anonymousUnion) {
anonymousUnion = false;
if (";" !== parts[pos++])
throw new Error(`expected semicolon`);
continue;
}
}
else
if (undefined !== enumState) {
output.add({
javascript: `${doExport ? "export " : ""}const ${className} = Object.freeze({`,
typescript: `${doExport ? "export " : ""}enum ${className} {`,
});
for (let [name, value] of enumState) {
if ("string" === typeof value)
value = '"' + value + '"';
output.add({
javascript: ` ${name}: ${value},`,
typescript: ` ${name} = ${value},`,
});
}
output.add({
javascript: `});`,
typescript: `}`,
});
output.push(``);
final = final.concat(output);
output.length = 0;
classes[className] = {
byteLength: 4,
align: Math.min(pack, 4), // enum is int
};
TypeAliases[className] = "Int32"
enumState = undefined;
className = undefined;
continue;
}
if (!byteOffset)
throw new Error(`empty struct`);
if (isTypedef === className) {
className = validateName(parts[pos++]);
if (classes[className])
throw new Error(`duplicate class "${className}"`);
}
if (";" !== parts[pos++])
throw new Error(`expected semicolon`);
if (json) {
if (doGet) {
output.add({
javascript: ` toJSON() {`,
typescript: ` toJSON(): object {`
});
output.push(` return {`);
output = output.concat(jsonOutput);
output.push(` };`);
output.push(` }`);
}
jsonOutput.length = 0;
if (doSet) {
output.add({
javascript: ` static from(obj) {`,
typescript: ` static from(obj: object): ${className} {`
});
output.push(` const result = new ${className};`);
output = output.concat(fromOutput.map(e => e.replace("##LATE_CAST##", className)));
output.push(` return result;`);
output.push(` }`);
}
fromOutput.length = 0;
}
output.push(`}`);
output.push(``);
const start = new Output;
start.push(`${doExport ? "export " : ""}class ${className} extends ${extendsClass} {`);
if (outputByteLength) {
start.push(` static byteLength = ${byteOffset};`);
start.push(``);
}
const limit = checkByteLength ? `, ${byteOffset}` : "";
start.add({
javascript: ` constructor(data, offset) {`,
typescript: ` constructor(data?: ArrayBufferLike, offset?: number) {`
});
start.push(` if (data)`);
start.push(` super(data, offset ?? 0${limit});`);
start.push(` else`);
start.push(` super(new ArrayBuffer(${byteOffset}));`);
start.push(` }`);
final = final.concat(start, output);
classes[className] = {
byteLength: byteOffset,
align: classAlign
};
output.length = 0;
byteOffset = 0;
properties.length = 0;
className = undefined;
classAlign = 0;
continue;
}
if ((part === "union") && ("{" === parts[pos])) {
if (!className)
throw new Error(`anonymous union must be in struct`);
if (undefined !== union)
throw new Error(`no nested unions`);
union = 0;
anonymousUnion = true;
pos += 1;
continue;
}
if (part === "union") {
if ("{" !== parts[pos + 1])
throw new Error(`open brace expected`);
className = validateName(parts[pos]);
if (classes[className])
throw new Error(`duplicate class "${className}"`);
classAlign = 1;
union = 0;
anonymousUnion = false;
pos += 2;
continue;
}
if (part === "enum") {
if (className)
throw new Error(`enum must be at root`);
className = validateName(parts[pos++]);
if (classes[className])
throw new Error(`duplicate name "${enumState.name}"`);
enumState = new Map;
enumState.value = -1;
enumContext += `const ${className} = {}\n`;
if ("{" !== parts[pos++])
throw new Error(`open brace expected`);
continue;
}
if (("typedef" === part) && (("struct" === parts[pos]) || (("volatile" == parts[pos]) && ("struct" === parts[pos + 1])))) {
if (className)
throw new Error(`cannot nest structure`);
if ("volatile" == parts[pos])
pos += 1;
if ("{" !== parts[pos + 1])
throw new Error(`open brace expected`);
className = isTypedef;
classAlign = 1;
jsonOutput = new Output;
fromOutput = new Output;
pos += 2;
continue;
}
if ("struct" === part) {
if (className)
throw new Error(`cannot nest structure`);
if ("{" !== parts[pos + 1])
throw new Error(`open brace expected`);
className = validateName(parts[pos]);
if (classes[className])
throw new Error(`duplicate class "${className}"`);
classAlign = 1;
jsonOutput = new Output;
fromOutput = new Output;
pos += 2;
continue;
}
if (part.startsWith("/*")) {
if (("header" === comments) && (1 === pos))
header = part;
else if ("true" === comments) {
if (className)
output.push(' ' + part);
else
final.push(part);
}
continue;
}
if ("#pragma" === part) {
let 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) {
return ("__COMPILEDATAVIEW__" === property) ? ${Version} : 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);
if (-1 !== end)
pos = end + 1;
continue;
}
if ("#error" === part) {
const end = parts.indexOf("\n", pos);
throw new Error(parts.slice(pos, (end < 0) ? parts.length : end).join(" "))
}
if (part.startsWith("#"))
throw new Error(`invalid preprocessor instruction`);
if (";" === part)
continue;
if (!className)
throw new Error(`unexpected`);
if (enumState) {
if (enumState.has(part))
throw new Error(`duplicate name ${part} in enum`);
let value = ++enumState.value;
if ("=" === parts[pos]) {
pos += 1;
const comma = parts.indexOf(",", pos);
const brace = parts.indexOf("}", pos);
if ((-1 == comma) && (-1 == brace))
throw new Error(`syntax error`);
const end = Math.min((comma < 0) ? 32767 : comma, (brace < 0) ? 32767 : brace);
const expression = parts.slice(pos, end).join(" ");
let context = "(function () {\n" + enumContext;
for (let [name, value] of enumState) {
if ("string" === typeof value)
value = '"' + value + '"';
context += `const ${name} = ${value};\n`;
}
context += `return ${expression};\n`;
context += `})();`
enumState.value = value = eval(context);
const type = typeof value;
if (("number" != type) && ("string" !== type) && ("boolean" !== type))
throw new Error(`invalid value for ${part}`);
pos = end;
}
if ("," === parts[pos])
pos += 1;
else if ("}" === parts[pos])
;
else
throw new Error(`syntax error`);
enumState.set(part, value);
if ("string" === typeof value)
value = '"' + value + '"';
enumContext += `${className}.${part} = ${value};\n`;
continue;
}
let type = part;
let name = validateName(parts[pos++]);
if (":" === parts[pos]) {
pos++;
bitCount = parseInt(parts[pos++]);
if ((bitCount <= 0) || (bitCount > 32) || isNaN(bitCount))
throw new Error(`invalid bit count`);
}
else {
if ("[" == parts[pos]) {
const bracket = parts.indexOf("]", pos + 1);
if (bracket < 0)
throw new Error(`right brace expected`);
const expression = parts.slice(pos + 1, bracket).join(" ");
let context = "(function () {\n" + enumContext;
context += `return ${expression};\n`;
context += `})();`
arrayCount = eval(context);
pos = bracket + 1;
arrayCount = Math.round(arrayCount);
if ((arrayCount <= 0) || isNaN(arrayCount) || (Infinity === arrayCount))
throw new Error(`invalid array count`);
}
}
if (properties.includes(name))
throw new Error(`duplicate name "${name}"`);
properties.push(name);
if (";" !== parts[pos++])
throw new Error(`expected semicolon`);
if (TypeAliases[type])
type = TypeAliases[type];
if (bitCount) {
if (("Uint8" === type) || ("Uint16" === type) || ("Uint32" === type)) {
const byteCount = byteCounts[type];
if ((byteCount * 8) < bitCount)
throw new Error(`${type} too small for bitfield`);
type = "Uint";
}
}
switch (type) {
case "Float32":
case "Float64":
case "Int8":
case "Int16":
case "Int32":
case "Uint8":
case "Uint16":
case "Uint32":
case "BigInt64":
case "BigUint64": {
flushBitfields();
if (undefined !== bitCount)
throw new Error(`cannot use bitfield with "${type}"`);
const byteCount = byteCounts[type];
const align = Math.min(pack, byteCount);
if (byteOffset % align)
endField(align - (byteOffset % align));
if (classAlign < align)
classAlign = align;
if (doGet && !name.startsWith(paddingPrefix)) {
output.add({
javascript: ` get ${name}() {`,
typescript: ` get ${name}(): ${(undefined === arrayCount) ? TypeScriptTypeAliases[type] : `${type}Array`} {`
});
if (undefined === arrayCount) {
if (1 === byteCount)
output.push(` return this.get${type}(${byteOffset});`);
else
output.push(` return this.get${type}(${byteOffset}, ${littleEndian});`);
}
else {
output.push(` return new ${type}Array(this.buffer, this.byteOffset${byteOffset ? (" + " + byteOffset) : ""}, ${arrayCount});`);
}
output.push(` }`);
}
if (doSet && !name.startsWith(paddingPrefix)) {
output.add({
javascript: ` set ${name}(value) {`,
typescript: ` set ${name}(value: ${(undefined === arrayCount) ? TypeScriptTypeAliases[type] : `ArrayLike<${TypeScriptTypeAliases[type]}>`}) {`,
});
output.push();
if (undefined === arrayCount) {
if (1 === byteCount)
output.push(` this.set${type}(${byteOffset}, value);`);
else
output.push(` this.set${type}(${byteOffset}, value, ${littleEndian});`);
}
else {
output.push(` for (let i = 0, j = this.byteOffset${byteOffset ? (" + " + byteOffset) : ""}; i < ${arrayCount}; i++, j += ${byteCount})`);
if (1 === byteCount)
output.push(` this.set${type}(j, value[i]);`);
else
output.push(` this.set${type}(j, value[i], ${littleEndian});`);
}
output.push(` }`);
}
endField((arrayCount ?? 1) * byteCount);
if (!name.startsWith(paddingPrefix)) {