modelscript/packages/language/src/codegen/types.ts at main · modelscript/modelscript · GitHub

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import { LanguageOptions } from "../dsl.js";

import { NormalizedGrammar } from "../grammar.js";

/**

* Generates AssemblyScript / TypeScript enum definitions (`SyntaxType`, `NodeFlag`, `FieldId`)

* corresponding to the grammar's symbols, fields, and flag attributes.

* @param grammar The user-defined language DSL options object.

* @param normalized The normalized grammar containing symbol-to-int mapping tables.

* @returns The generated TypeScript/AssemblyScript source code string for enum definitions.

export function generateTypes(grammar: LanguageOptions<any>, normalized: NormalizedGrammar): string {

let typeCode = `// Token and Node Types for ${grammar.name}\n`;

typeCode += `export enum SyntaxType {\n`;

typeCode += ` ERROR = 0,\n`;

// Create reverse mapping from integer ID to symbol string (preferring human-readable names)

const intToSym = new Map<number, string>();

for (const [sym, i] of normalized.symToInt.entries()) {

const existing = intToSym.get(i);

if (!existing) {

intToSym.set(i, sym);

} else {

const existingIsLiteral = existing.startsWith('"') || existing.startsWith("/");

const symIsLiteral = sym.startsWith('"') || sym.startsWith("/");

if (existingIsLiteral && !symIsLiteral) {

intToSym.set(i, sym);

}

// Output symbols in strict sequential ID order

const emittedNames = new Set<string>();

for (let i = 1; i <= intToSym.size; i++) {

const sym = intToSym.get(i);

if (!sym) continue;

// Convert symbol strings (e.g. literals or regex) to safe C-style identifiers

let safeName = sym.replace(/[^a-zA-Z0-9]/g, "_");

if (sym.startsWith('"') || sym.startsWith("/")) {

safeName = "T_" + i; // Guarantee identifier uniqueness for terminal literals

} else {

safeName = safeName.toUpperCase();

}

// Prepend underscore if identifier starts with a digit

if (/^[0-9]/.test(safeName)) safeName = "_" + safeName;

// Deduplicate enum field names using numerical suffixing

let finalName = safeName;

let suffix = 1;

while (emittedNames.has(finalName)) {

finalName = `${safeName}_${suffix}`;

suffix++;

}

typeCode += ` ${finalName} = ${i},\n`;

emittedNames.add(finalName);

}

// Automatically generate shadow SyntaxTypes for any types defined in `model` or `lints` but not in `rules`

let shadowIdx = 10000;

if (grammar.model) {

// Start shadow types at a high offset to avoid collision with standard rules

for (const modelName of Object.keys(grammar.model)) {

let safeName = modelName.replace(/[^a-zA-Z0-9]/g, "_").toUpperCase();

if (/^[0-9]/.test(safeName)) safeName = "_" + safeName;

if (!emittedNames.has(safeName)) {

typeCode += ` ${safeName} = ${shadowIdx},\n`;

emittedNames.add(safeName);

shadowIdx++;

}

if (grammar.lints) {

for (const lint of Object.values(grammar.lints) as any[]) {

if (lint && Array.isArray(lint.nodes)) {

for (const nodeName of lint.nodes) {

if (typeof nodeName === "string") {

let safeName = nodeName.replace(/[^a-zA-Z0-9]/g, "_").toUpperCase();

if (/^[0-9]/.test(safeName)) safeName = "_" + safeName;

if (!emittedNames.has(safeName)) {

typeCode += ` ${safeName} = ${shadowIdx},\n`;

emittedNames.add(safeName);

shadowIdx++;

}

// Fallback shadow types commonly referenced in codegen/typesys

const commonFallbacks = [

"IDENTIFIER",

"NUMBER",

"REAL",

"STRING",

"STRING_LITERAL",

"BOOLEAN",

"UNSIGNED_INTEGER",

"UNSIGNED_REAL",

"ARRAY_CONSTRUCTOR",

"ARRAY_COMPREHENSION",

"EXTERNAL_CLAUSE",

"PUBLIC_ELEMENT_LIST",

"PROTECTED_ELEMENT_LIST",

"TUPLE_EXPRESSION",

"RANGE_EXPRESSION",

"DIV_EXPRESSION",

"ASSIGNMENT_STATEMENT",

"ADD_EXPRESSION",

"SUB_EXPRESSION",

"MUL_EXPRESSION",

];

for (const fallback of commonFallbacks) {

if (!emittedNames.has(fallback)) {

typeCode += ` ${fallback} = ${shadowIdx},\n`;

emittedNames.add(fallback);

shadowIdx++;

}

typeCode += ` LIST = 99999,\n`;

typeCode += `}\n\n`;

// Synthesize NodeFlag bitmask from `type: "flag"` or `type: "bool"` attributes in the model

let flagBits = 0;

const flagMap = new Map<string, number>();

typeCode += `export enum NodeFlag {\n`;

typeCode += ` NONE = 0,\n`;

if (grammar.model) {

for (const modelKey of Object.keys(grammar.model)) {

const attrs = (grammar.model as any)[modelKey];

for (const attrKey of Object.keys(attrs)) {

const attr = attrs[attrKey];

if (typeof attr === "object" && (attr?.type === "flag" || attr?.type === "bool")) {

let safeName = attrKey.replace(/([a-z])([A-Z])/g, "$1_$2").toUpperCase();

safeName = safeName.replace(/[^A-Z0-9_]/g, "_");

if (/^[0-9]/.test(safeName)) safeName = "_" + safeName;

if (!flagMap.has(safeName) && flagBits < 30) {

flagMap.set(safeName, 1 << flagBits);

typeCode += ` ${safeName} = 1 << ${flagBits},\n`;

flagBits++;

}

const commonFlags = [

"IS_PROTECTED",

"IS_FINAL",

"IS_PARTIAL",

"IS_CONNECTOR",

"HAS_INNER_MATCH",

"IS_REPLACEABLE",

"IS_STREAM",

"IS_FLOW",

"IS_INPUT",

"IS_OUTPUT",

"IS_PARAMETER",

"IS_CONSTANT",

"IS_DISCRETE",

"IS_CLOCKED",

"IS_IMPURE",

"IS_PURE",

"IS_EXPANDABLE",

"IS_ENCAPSULATED",

"IS_OPERATOR",

"IS_FUNCTION",

"IS_BLOCK",

"IS_MODEL",

"IS_RECORD",

"IS_TYPE",

"IS_PACKAGE",

"IS_CLASS",

"IS_ARRAY",

"IS_VARIABLE",

"IS_PRIMITIVE",

"IS_ENUM",

"IS_STRUCT",

"IS_ROOT",

];

for (const flag of commonFlags) {

if (!flagMap.has(flag) && flagBits < 30) {

flagMap.set(flag, 1 << flagBits);

typeCode += ` ${flag} = 1 << ${flagBits},\n`;

flagBits++;

}

typeCode += `}\n\n`;

// Synthesize Property enum for key-value model property lookups

let propIdx = 1;

const propMap = new Map<string, number>();

typeCode += `export enum Property {\n`;

typeCode += ` NONE = 0,\n`;

if (grammar.model) {

for (const modelKey of Object.keys(grammar.model)) {

const attrs = (grammar.model as any)[modelKey];

for (const attrKey of Object.keys(attrs)) {

const attr = attrs[attrKey];

if (typeof attr === "object" && typeof attr?.type === "string") {

let safeName = attrKey.replace(/([a-z])([A-Z])/g, "$1_$2").toUpperCase();

safeName = safeName.replace(/[^A-Z0-9_]/g, "_");

if (/^[0-9]/.test(safeName)) safeName = "_" + safeName;

if (!propMap.has(safeName)) {

propMap.set(safeName, propIdx);

typeCode += ` ${safeName} = ${propIdx},\n`;

propIdx++;

}

const commonProps = [

"BASE_TYPE",

"FLOW_COUNT",

"VALUE",

"KIND",

"VARIABILITY",

"CAUSALITY",

"CLOCK_ID",

"DIMENSIONS",

"SHAPE",

"START_VALUE",

"BINDING_EXPR",

"SOURCE_NODE",

"TARGET_NODE",

];

for (const prop of commonProps) {

if (!propMap.has(prop)) {

propMap.set(prop, propIdx);

typeCode += ` ${prop} = ${propIdx},\n`;

propIdx++;

}

typeCode += `}\n\n`;

typeCode += `export enum FieldId {\n`;

typeCode += ` NONE = 0,\n`;

const fieldNamesMap = new Map<string, number>();

let nextFieldId = 1;

for (const [fieldName, id] of normalized.fieldToInt.entries()) {

if (typeof fieldName !== "string") continue;

let safeName = fieldName.replace(/([a-z])([A-Z])/g, "$1_$2").toUpperCase();

safeName = safeName.replace(/[^A-Z0-9_]/g, "_");

if (!fieldNamesMap.has(safeName)) {

fieldNamesMap.set(safeName, id);

if (id >= nextFieldId) nextFieldId = id + 1;

}

// Pre-seed common AST field names so query AST traversals never crash AssemblyScript compilation

const commonFields = [

"NAME",

"END_NAME",

"LEFT",

"RIGHT",

"LHS",

"RHS",

"OPERAND",

"ARGUMENT",

"ARGUMENTS",

"BINDING",

"MODIFICATION",

"BODY",

"CONDITION",

"VALUE",

"TYPE",

"TYPE_SPECIFIER",

"FROM",

"TO",

"SOURCE",

"TARGET",

"STATEMENT",

"EXPRESSION",

"REDECLARE",

"STEP",

"START",

"FACTOR",

"CONNECT_EQUATION",

"DECLARATION",

"DECLARATIONS",

"ELEMENT",

"ELEMENTS",

"EQUATION",

"EQUATIONS",

];

for (const f of commonFields) {

if (!fieldNamesMap.has(f)) {

fieldNamesMap.set(f, nextFieldId++);

}

for (const [safeName, id] of fieldNamesMap.entries()) {

typeCode += ` ${safeName} = ${id},\n`;

}

typeCode += `}\n\n`;

return typeCode;

}

modelscript/packages/language/src/codegen/types.ts at main · modelscript/modelscript · GitHub

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modelscript/packages/language/src/codegen/types.ts at main · modelscript/modelscript · GitHub

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