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import * as path from "path";
import { Mapping, SourceMapGenerator, SourceNode } from "source-map";
import * as ts from "typescript";
import { CompilerOptions, isBundleEnabled, LuaLibImportKind, LuaTarget } from "./CompilerOptions";
import * as lua from "./LuaAST";
import { loadImportedLualibFeatures, loadInlineLualibFeatures, LuaLibFeature } from "./LuaLib";
import { isValidLuaIdentifier, shouldAllowUnicode } from "./transformation/utils/safe-names";
import { EmitHost, getEmitPath } from "./transpilation";
import { intersperse, normalizeSlashes } from "./utils";
// https://www.lua.org/pil/2.4.html
// https://www.ecma-international.org/ecma-262/10.0/index.html#table-34
const escapeStringRegExp = /[\b\f\n\r\t\v\\"\0]/g;
const escapeStringMap: Record<string, string> = {
"\b": "\\b",
"\f": "\\f",
"\n": "\\n",
"\r": "\\r",
"\t": "\\t",
"\v": "\\v",
"\\": "\\\\",
'"': '\\"',
"\0": "\\0",
};
export const escapeString = (value: string) => `"${value.replace(escapeStringRegExp, char => escapeStringMap[char])}"`;
export const tstlHeader = "--[[ Generated with https://github.com/TypeScriptToLua/TypeScriptToLua ]]\n";
/**
* Checks that a name is valid for use in lua function declaration syntax:
*
* `foo.bar` => passes (`function foo.bar()` is valid)
* `getFoo().bar` => fails (`function getFoo().bar()` would be illegal)
*/
const isValidLuaFunctionDeclarationName = (str: string, options: CompilerOptions) =>
(shouldAllowUnicode(options) ? /^[a-zA-Z0-9_\u00FF-\uFFFD.]+$/ : /^[a-zA-Z0-9_.]+$/).test(str);
/**
* Returns true if expression contains no function calls.
*/
function isSimpleExpression(expression: lua.Expression): boolean {
switch (expression.kind) {
case lua.SyntaxKind.CallExpression:
case lua.SyntaxKind.MethodCallExpression:
case lua.SyntaxKind.FunctionExpression:
return false;
case lua.SyntaxKind.TableExpression:
const tableExpression = expression as lua.TableExpression;
return tableExpression.fields.every(e => isSimpleExpression(e));
case lua.SyntaxKind.TableFieldExpression:
const fieldExpression = expression as lua.TableFieldExpression;
return (
(!fieldExpression.key || isSimpleExpression(fieldExpression.key)) &&
isSimpleExpression(fieldExpression.value)
);
case lua.SyntaxKind.TableIndexExpression:
const indexExpression = expression as lua.TableIndexExpression;
return isSimpleExpression(indexExpression.table) && isSimpleExpression(indexExpression.index);
case lua.SyntaxKind.UnaryExpression:
return isSimpleExpression((expression as lua.UnaryExpression).operand);
case lua.SyntaxKind.BinaryExpression:
const binaryExpression = expression as lua.BinaryExpression;
return isSimpleExpression(binaryExpression.left) && isSimpleExpression(binaryExpression.right);
}
return true;
}
type SourceChunk = string | SourceNode;
export type Printer = (program: ts.Program, emitHost: EmitHost, fileName: string, file: lua.File) => PrintResult;
export interface PrintResult {
code: string;
sourceMap: string;
sourceMapNode: SourceNode;
}
export function createPrinter(printers: Printer[]): Printer {
if (printers.length === 0) {
return (program, emitHost, fileName, file) => new LuaPrinter(emitHost, program, fileName).print(file);
} else if (printers.length === 1) {
return printers[0];
} else {
throw new Error("Only one plugin can specify 'printer'");
}
}
export class LuaPrinter {
private static operatorMap: Record<lua.Operator, string> = {
[lua.SyntaxKind.AdditionOperator]: "+",
[lua.SyntaxKind.SubtractionOperator]: "-",
[lua.SyntaxKind.MultiplicationOperator]: "*",
[lua.SyntaxKind.DivisionOperator]: "/",
[lua.SyntaxKind.FloorDivisionOperator]: "//",
[lua.SyntaxKind.ModuloOperator]: "%",
[lua.SyntaxKind.PowerOperator]: "^",
[lua.SyntaxKind.NegationOperator]: "-",
[lua.SyntaxKind.ConcatOperator]: "..",
[lua.SyntaxKind.LengthOperator]: "#",
[lua.SyntaxKind.EqualityOperator]: "==",
[lua.SyntaxKind.InequalityOperator]: "~=",
[lua.SyntaxKind.LessThanOperator]: "<",
[lua.SyntaxKind.LessEqualOperator]: "<=",
[lua.SyntaxKind.GreaterThanOperator]: ">",
[lua.SyntaxKind.GreaterEqualOperator]: ">=",
[lua.SyntaxKind.AndOperator]: "and",
[lua.SyntaxKind.OrOperator]: "or",
[lua.SyntaxKind.NotOperator]: "not ",
[lua.SyntaxKind.BitwiseAndOperator]: "&",
[lua.SyntaxKind.BitwiseOrOperator]: "|",
[lua.SyntaxKind.BitwiseExclusiveOrOperator]: "~",
[lua.SyntaxKind.BitwiseRightShiftOperator]: ">>",
[lua.SyntaxKind.BitwiseLeftShiftOperator]: "<<",
[lua.SyntaxKind.BitwiseNotOperator]: "~",
};
private static operatorPrecedence: Record<lua.Operator, number> = {
[lua.SyntaxKind.OrOperator]: 1,
[lua.SyntaxKind.AndOperator]: 2,
[lua.SyntaxKind.EqualityOperator]: 3,
[lua.SyntaxKind.InequalityOperator]: 3,
[lua.SyntaxKind.LessThanOperator]: 3,
[lua.SyntaxKind.LessEqualOperator]: 3,
[lua.SyntaxKind.GreaterThanOperator]: 3,
[lua.SyntaxKind.GreaterEqualOperator]: 3,
[lua.SyntaxKind.BitwiseOrOperator]: 4,
[lua.SyntaxKind.BitwiseExclusiveOrOperator]: 5,
[lua.SyntaxKind.BitwiseAndOperator]: 6,
[lua.SyntaxKind.BitwiseLeftShiftOperator]: 7,
[lua.SyntaxKind.BitwiseRightShiftOperator]: 7,
[lua.SyntaxKind.ConcatOperator]: 8,
[lua.SyntaxKind.AdditionOperator]: 9,
[lua.SyntaxKind.SubtractionOperator]: 9,
[lua.SyntaxKind.MultiplicationOperator]: 10,
[lua.SyntaxKind.DivisionOperator]: 10,
[lua.SyntaxKind.FloorDivisionOperator]: 10,
[lua.SyntaxKind.ModuloOperator]: 10,
[lua.SyntaxKind.NotOperator]: 11,
[lua.SyntaxKind.LengthOperator]: 11,
[lua.SyntaxKind.NegationOperator]: 11,
[lua.SyntaxKind.BitwiseNotOperator]: 11,
[lua.SyntaxKind.PowerOperator]: 12,
};
private static rightAssociativeOperators = new Set([lua.SyntaxKind.ConcatOperator, lua.SyntaxKind.PowerOperator]);
private currentIndent = "";
protected luaFile: string;
protected relativeSourcePath: string;
protected options: CompilerOptions;
public static readonly sourceMapTracebackPlaceholder = "{#SourceMapTraceback}";
constructor(private emitHost: EmitHost, private program: ts.Program, private sourceFile: string) {
this.options = program.getCompilerOptions();
this.luaFile = normalizeSlashes(getEmitPath(this.sourceFile, this.program));
// Source nodes contain relative path from mapped lua file to original TS source file
this.relativeSourcePath = normalizeSlashes(path.relative(path.dirname(this.luaFile), this.sourceFile));
}
public print(file: lua.File): PrintResult {
// Add traceback lualib if sourcemap traceback option is enabled
if (this.options.sourceMapTraceback) {
file.luaLibFeatures.add(LuaLibFeature.SourceMapTraceBack);
}
const sourceRoot = this.options.sourceRoot
? // According to spec, sourceRoot is simply prepended to the source name, so the slash should be included
`${this.options.sourceRoot.replace(/[\\/]+$/, "")}/`
: "";
const rootSourceNode = this.printFile(file);
const sourceMap = this.buildSourceMap(sourceRoot, rootSourceNode);
let code = rootSourceNode.toString();
if (this.options.inlineSourceMap) {
code += "\n" + this.printInlineSourceMap(sourceMap);
}
if (this.options.sourceMapTraceback) {
const stackTraceOverride = this.printStackTraceOverride(rootSourceNode);
code = code.replace(LuaPrinter.sourceMapTracebackPlaceholder, stackTraceOverride);
}
return { code, sourceMap: sourceMap.toString(), sourceMapNode: rootSourceNode };
}
private printInlineSourceMap(sourceMap: SourceMapGenerator): string {
const map = sourceMap.toString();
const base64Map = Buffer.from(map).toString("base64");
return `--# sourceMappingURL=data:application/json;base64,${base64Map}\n`;
}
private printStackTraceOverride(rootNode: SourceNode): string {
let currentLine = 1;
const map: Record<number, number> = {};
rootNode.walk((chunk, mappedPosition) => {
if (mappedPosition.line !== undefined && mappedPosition.line > 0) {
if (map[currentLine] === undefined) {
map[currentLine] = mappedPosition.line;
} else {
map[currentLine] = Math.min(map[currentLine], mappedPosition.line);
}
}
currentLine += chunk.split("\n").length - 1;
});
const mapItems = Object.entries(map).map(([line, original]) => `["${line}"] = ${original}`);
const mapString = "{" + mapItems.join(",") + "}";
return `__TS__SourceMapTraceBack(debug.getinfo(1).short_src, ${mapString});`;
}
protected printFile(file: lua.File): SourceNode {
let sourceChunks: SourceChunk[] = [file.trivia];
if (!this.options.noHeader) {
sourceChunks.push(tstlHeader);
}
const luaTarget = this.options.luaTarget ?? LuaTarget.Universal;
const luaLibImport = this.options.luaLibImport ?? LuaLibImportKind.Require;
if (
(luaLibImport === LuaLibImportKind.Require || luaLibImport === LuaLibImportKind.RequireMinimal) &&
file.luaLibFeatures.size > 0
) {
// Import lualib features
sourceChunks = this.printStatementArray(
loadImportedLualibFeatures(file.luaLibFeatures, luaTarget, this.emitHost)
);
} else if (luaLibImport === LuaLibImportKind.Inline && file.luaLibFeatures.size > 0) {
// Inline lualib features
sourceChunks.push("-- Lua Library inline imports\n");
sourceChunks.push(loadInlineLualibFeatures(file.luaLibFeatures, luaTarget, this.emitHost));
sourceChunks.push("-- End of Lua Library inline imports\n");
}
if (this.options.sourceMapTraceback && !isBundleEnabled(this.options)) {
// In bundle mode the traceback is being generated for the entire file in getBundleResult
// Otherwise, traceback is being generated locally
sourceChunks.push(`${LuaPrinter.sourceMapTracebackPlaceholder}\n`);
}
// Print reest of the statements in file
sourceChunks.push(...this.printStatementArray(file.statements));
return this.concatNodes(...sourceChunks);
}
protected pushIndent(): void {
this.currentIndent += " ";
}
protected popIndent(): void {
this.currentIndent = this.currentIndent.slice(4);
}
protected indent(input: SourceChunk = ""): SourceChunk {
return this.concatNodes(this.currentIndent, input);
}
protected createSourceNode(node: lua.Node, chunks: SourceChunk | SourceChunk[], name?: string): SourceNode {
const { line, column } = lua.getOriginalPos(node);
return line !== undefined && column !== undefined
? new SourceNode(line + 1, column, this.relativeSourcePath, chunks, name)
: new SourceNode(null, null, this.relativeSourcePath, chunks, name);
}
protected concatNodes(...chunks: SourceChunk[]): SourceNode {
return new SourceNode(null, null, this.relativeSourcePath, chunks);
}
protected printBlock(block: lua.Block): SourceNode {
return this.concatNodes(...this.printStatementArray(block.statements));
}
private statementMayRequireSemiColon(statement: lua.Statement): boolean {
// Types of statements that could create ambiguous syntax if followed by parenthesis
return (
lua.isVariableDeclarationStatement(statement) ||
lua.isAssignmentStatement(statement) ||
lua.isExpressionStatement(statement)
);
}
private nodeStartsWithParenthesis(sourceNode: SourceNode): boolean {
let result: boolean | undefined;
sourceNode.walk(chunk => {
if (result === undefined) {
chunk = chunk.trimLeft(); // Ignore leading whitespace
if (chunk.length > 0) {
result = chunk.startsWith("(");
}
}
});
return result ?? false;
}
protected printStatementArray(statements: lua.Statement[]): SourceChunk[] {
const statementNodes: SourceNode[] = [];
for (const [index, statement] of statements.entries()) {
const node = this.printStatement(statement);
if (
index > 0 &&
this.statementMayRequireSemiColon(statements[index - 1]) &&
this.nodeStartsWithParenthesis(node)
) {
statementNodes[index - 1].add(";");
}
statementNodes.push(node);
if (lua.isReturnStatement(statement)) break;
}
return statementNodes.length > 0 ? [...intersperse<SourceChunk>(statementNodes, "\n"), "\n"] : [];
}
public printStatement(statement: lua.Statement): SourceNode {
let resultNode = this.printStatementExcludingComments(statement);
if (statement.leadingComments) {
resultNode = this.concatNodes(
statement.leadingComments.map(c => this.printComment(c)).join("\n"),
"\n",
resultNode
);
}
if (statement.trailingComments) {
resultNode = this.concatNodes(
resultNode,
"\n",
statement.trailingComments.map(c => this.printComment(c)).join("\n")
);
}
return resultNode;
}
public printComment(comment: string | string[]): SourceChunk {
if (Array.isArray(comment)) {
if (comment.length === 0) {
return this.indent("--[[]]");
} else {
const [firstLine, ...restLines] = comment;
const commentLines = this.concatNodes(...restLines.map(c => this.concatNodes("\n", this.indent(c))));
return this.concatNodes(this.indent("--[["), firstLine, commentLines, "]]");
}
} else {
return this.indent(`--${comment}`);
}
}
protected printStatementExcludingComments(statement: lua.Statement): SourceNode {
switch (statement.kind) {
case lua.SyntaxKind.DoStatement:
return this.printDoStatement(statement as lua.DoStatement);
case lua.SyntaxKind.VariableDeclarationStatement:
return this.printVariableDeclarationStatement(statement as lua.VariableDeclarationStatement);
case lua.SyntaxKind.AssignmentStatement:
return this.printVariableAssignmentStatement(statement as lua.AssignmentStatement);
case lua.SyntaxKind.IfStatement:
return this.printIfStatement(statement as lua.IfStatement);
case lua.SyntaxKind.WhileStatement:
return this.printWhileStatement(statement as lua.WhileStatement);
case lua.SyntaxKind.RepeatStatement:
return this.printRepeatStatement(statement as lua.RepeatStatement);
case lua.SyntaxKind.ForStatement:
return this.printForStatement(statement as lua.ForStatement);
case lua.SyntaxKind.ForInStatement:
return this.printForInStatement(statement as lua.ForInStatement);
case lua.SyntaxKind.GotoStatement:
return this.printGotoStatement(statement as lua.GotoStatement);
case lua.SyntaxKind.LabelStatement:
return this.printLabelStatement(statement as lua.LabelStatement);
case lua.SyntaxKind.ReturnStatement:
return this.printReturnStatement(statement as lua.ReturnStatement);
case lua.SyntaxKind.BreakStatement:
return this.printBreakStatement(statement as lua.BreakStatement);
case lua.SyntaxKind.ExpressionStatement:
return this.printExpressionStatement(statement as lua.ExpressionStatement);
default:
throw new Error(`Tried to print unknown statement kind: ${lua.SyntaxKind[statement.kind]}`);
}
}
public printDoStatement(statement: lua.DoStatement): SourceNode {
const chunks: SourceChunk[] = [];
chunks.push(this.indent("do\n"));
this.pushIndent();
chunks.push(...this.printStatementArray(statement.statements));
this.popIndent();
chunks.push(this.indent("end"));
return this.concatNodes(...chunks);
}
public printVariableDeclarationStatement(statement: lua.VariableDeclarationStatement): SourceNode {
const chunks: SourceChunk[] = [];
chunks.push(this.indent("local "));
if (lua.isFunctionDefinition(statement)) {
// Print all local functions as `local function foo()` instead of `local foo = function` to allow recursion
chunks.push(this.printFunctionDefinition(statement));
} else {
chunks.push(...this.joinChunksWithComma(statement.left.map(e => this.printExpression(e))));
if (statement.right) {
chunks.push(" = ");
chunks.push(...this.joinChunksWithComma(statement.right.map(e => this.printExpression(e))));
}
}
return this.createSourceNode(statement, chunks);
}
public printVariableAssignmentStatement(statement: lua.AssignmentStatement): SourceNode {
const chunks: SourceChunk[] = [];
chunks.push(this.indent());
if (lua.isFunctionDefinition(statement) && (statement.right[0].flags & lua.NodeFlags.Declaration) !== 0) {
// Use `function foo()` instead of `foo = function()`
const name = this.printExpression(statement.left[0]);
if (isValidLuaFunctionDeclarationName(name.toString(), this.options)) {
chunks.push(this.printFunctionDefinition(statement));
return this.createSourceNode(statement, chunks);
}
}
chunks.push(...this.joinChunksWithComma(statement.left.map(e => this.printExpression(e))));
chunks.push(" = ");
chunks.push(...this.joinChunksWithComma(statement.right.map(e => this.printExpression(e))));
return this.createSourceNode(statement, chunks);
}
public printIfStatement(statement: lua.IfStatement, isElseIf = false): SourceNode {
const chunks: SourceChunk[] = [];
const prefix = isElseIf ? "elseif" : "if";
chunks.push(this.indent(prefix + " "), this.printExpression(statement.condition), " then\n");
this.pushIndent();
chunks.push(this.printBlock(statement.ifBlock));
this.popIndent();
if (statement.elseBlock) {
if (lua.isIfStatement(statement.elseBlock)) {
chunks.push(this.printIfStatement(statement.elseBlock, true));
} else {
chunks.push(this.indent("else\n"));
this.pushIndent();
chunks.push(this.printBlock(statement.elseBlock));
this.popIndent();
chunks.push(this.indent("end"));
}
} else {
chunks.push(this.indent("end"));
}
return this.concatNodes(...chunks);
}
public printWhileStatement(statement: lua.WhileStatement): SourceNode {
const chunks: SourceChunk[] = [];
chunks.push(this.indent("while "), this.printExpression(statement.condition), " do\n");
this.pushIndent();
chunks.push(this.printBlock(statement.body));
this.popIndent();
chunks.push(this.indent("end"));
return this.concatNodes(...chunks);
}
public printRepeatStatement(statement: lua.RepeatStatement): SourceNode {
const chunks: SourceChunk[] = [];
chunks.push(this.indent("repeat\n"));
this.pushIndent();
chunks.push(this.printBlock(statement.body));
this.popIndent();
chunks.push(this.indent("until "), this.printExpression(statement.condition));
return this.concatNodes(...chunks);
}
public printForStatement(statement: lua.ForStatement): SourceNode {
const ctrlVar = this.printExpression(statement.controlVariable);
const ctrlVarInit = this.printExpression(statement.controlVariableInitializer);
const limit = this.printExpression(statement.limitExpression);
const chunks: SourceChunk[] = [];
chunks.push(this.indent("for "), ctrlVar, " = ", ctrlVarInit, ", ", limit);
if (statement.stepExpression) {
chunks.push(", ", this.printExpression(statement.stepExpression));
}
chunks.push(" do\n");
this.pushIndent();
chunks.push(this.printBlock(statement.body));
this.popIndent();
chunks.push(this.indent("end"));
return this.concatNodes(...chunks);
}
public printForInStatement(statement: lua.ForInStatement): SourceNode {
const names = this.joinChunksWithComma(statement.names.map(i => this.printIdentifier(i)));
const expressions = this.joinChunksWithComma(statement.expressions.map(e => this.printExpression(e)));
const chunks: SourceChunk[] = [];
chunks.push(this.indent("for "), ...names, " in ", ...expressions, " do\n");
this.pushIndent();
chunks.push(this.printBlock(statement.body));
this.popIndent();
chunks.push(this.indent("end"));
return this.createSourceNode(statement, chunks);
}
public printGotoStatement(statement: lua.GotoStatement): SourceNode {
return this.createSourceNode(statement, [this.indent("goto "), statement.label]);
}
public printLabelStatement(statement: lua.LabelStatement): SourceNode {
return this.createSourceNode(statement, [this.indent("::"), statement.name, "::"]);
}
public printReturnStatement(statement: lua.ReturnStatement): SourceNode {
if (statement.expressions.length === 0) {
return this.createSourceNode(statement, this.indent("return"));
}
const chunks: SourceChunk[] = [];
chunks.push(...this.joinChunksWithComma(statement.expressions.map(e => this.printExpression(e))));
return this.createSourceNode(statement, [this.indent(), "return ", ...chunks]);
}
public printBreakStatement(statement: lua.BreakStatement): SourceNode {
return this.createSourceNode(statement, this.indent("break"));
}
public printExpressionStatement(statement: lua.ExpressionStatement): SourceNode {
return this.createSourceNode(statement, [this.indent(), this.printExpression(statement.expression)]);
}
// Expressions
public printExpression(expression: lua.Expression): SourceNode {
switch (expression.kind) {
case lua.SyntaxKind.StringLiteral:
return this.printStringLiteral(expression as lua.StringLiteral);
case lua.SyntaxKind.NumericLiteral:
return this.printNumericLiteral(expression as lua.NumericLiteral);
case lua.SyntaxKind.NilKeyword:
return this.printNilLiteral(expression as lua.NilLiteral);
case lua.SyntaxKind.DotsKeyword:
return this.printDotsLiteral(expression as lua.DotsLiteral);
case lua.SyntaxKind.ArgKeyword:
return this.printArgLiteral(expression as lua.ArgLiteral);
case lua.SyntaxKind.TrueKeyword:
case lua.SyntaxKind.FalseKeyword:
return this.printBooleanLiteral(expression as lua.BooleanLiteral);
case lua.SyntaxKind.FunctionExpression:
return this.printFunctionExpression(expression as lua.FunctionExpression);
case lua.SyntaxKind.TableFieldExpression:
return this.printTableFieldExpression(expression as lua.TableFieldExpression);
case lua.SyntaxKind.TableExpression:
return this.printTableExpression(expression as lua.TableExpression);
case lua.SyntaxKind.UnaryExpression:
return this.printUnaryExpression(expression as lua.UnaryExpression);
case lua.SyntaxKind.BinaryExpression:
return this.printBinaryExpression(expression as lua.BinaryExpression);
case lua.SyntaxKind.CallExpression:
return this.printCallExpression(expression as lua.CallExpression);
case lua.SyntaxKind.MethodCallExpression:
return this.printMethodCallExpression(expression as lua.MethodCallExpression);
case lua.SyntaxKind.Identifier:
return this.printIdentifier(expression as lua.Identifier);
case lua.SyntaxKind.TableIndexExpression:
return this.printTableIndexExpression(expression as lua.TableIndexExpression);
case lua.SyntaxKind.ParenthesizedExpression:
return this.printParenthesizedExpression(expression as lua.ParenthesizedExpression);
default:
throw new Error(`Tried to print unknown statement kind: ${lua.SyntaxKind[expression.kind]}`);
}
}
public printStringLiteral(expression: lua.StringLiteral): SourceNode {
return this.createSourceNode(expression, escapeString(expression.value));
}
public printNumericLiteral(expression: lua.NumericLiteral): SourceNode {
return this.createSourceNode(expression, String(expression.value));
}
public printNilLiteral(expression: lua.NilLiteral): SourceNode {
return this.createSourceNode(expression, "nil");
}
public printDotsLiteral(expression: lua.DotsLiteral): SourceNode {
return this.createSourceNode(expression, "...");
}
public printArgLiteral(expression: lua.ArgLiteral): SourceNode {
return this.createSourceNode(expression, "arg");
}
public printBooleanLiteral(expression: lua.BooleanLiteral): SourceNode {
return this.createSourceNode(expression, expression.kind === lua.SyntaxKind.TrueKeyword ? "true" : "false");
}
private printFunctionParameters(expression: lua.FunctionExpression): SourceChunk[] {
const parameterChunks = (expression.params ?? []).map(i => this.printIdentifier(i));
if (expression.dots) {
parameterChunks.push(this.printDotsLiteral(expression.dots));
}
return this.joinChunksWithComma(parameterChunks);
}
public printFunctionExpression(expression: lua.FunctionExpression): SourceNode {
const chunks: SourceChunk[] = [];
chunks.push("function(");
chunks.push(...this.printFunctionParameters(expression));
chunks.push(")");
if (lua.isInlineFunctionExpression(expression)) {
const returnStatement = expression.body.statements[0];
chunks.push(" ");
const returnNode: SourceChunk[] = [
"return ",
...this.joinChunksWithComma(returnStatement.expressions.map(e => this.printExpression(e))),
];
chunks.push(this.createSourceNode(returnStatement, returnNode));
chunks.push(this.createSourceNode(expression, " end"));
} else {
chunks.push("\n");
this.pushIndent();
chunks.push(this.printBlock(expression.body));
this.popIndent();
chunks.push(this.indent(this.createSourceNode(expression, "end")));
}
return this.createSourceNode(expression, chunks);
}
public printFunctionDefinition(statement: lua.FunctionDefinition): SourceNode {
const expression = statement.right[0];
const chunks: SourceChunk[] = [];
chunks.push("function ");
chunks.push(this.printExpression(statement.left[0]));
chunks.push("(");
chunks.push(...this.printFunctionParameters(expression));
chunks.push(")\n");
this.pushIndent();
chunks.push(this.printBlock(expression.body));
this.popIndent();
chunks.push(this.indent(this.createSourceNode(statement, "end")));
return this.createSourceNode(expression, chunks);
}
public printTableFieldExpression(expression: lua.TableFieldExpression): SourceNode {
const chunks: SourceChunk[] = [];
const value = this.printExpression(expression.value);
if (expression.key) {
if (lua.isStringLiteral(expression.key) && isValidLuaIdentifier(expression.key.value, this.options)) {
chunks.push(expression.key.value, " = ", value);
} else {
chunks.push("[", this.printExpression(expression.key), "] = ", value);
}
} else {
chunks.push(value);
}
return this.createSourceNode(expression, chunks);
}
public printTableExpression(expression: lua.TableExpression): SourceNode {
return this.createSourceNode(expression, ["{", ...this.printExpressionList(expression.fields), "}"]);
}
public printUnaryExpression(expression: lua.UnaryExpression): SourceNode {
const chunks: SourceChunk[] = [];
chunks.push(this.printOperator(expression.operator));
chunks.push(
this.printExpressionInParenthesesIfNeeded(
expression.operand,
LuaPrinter.operatorPrecedence[expression.operator]
)
);
return this.createSourceNode(expression, chunks);
}
public printBinaryExpression(expression: lua.BinaryExpression): SourceNode {
const chunks: SourceChunk[] = [];
const isRightAssociative = LuaPrinter.rightAssociativeOperators.has(expression.operator);
const precedence = LuaPrinter.operatorPrecedence[expression.operator];
chunks.push(
this.printExpressionInParenthesesIfNeeded(expression.left, isRightAssociative ? precedence + 1 : precedence)
);
chunks.push(" ", this.printOperator(expression.operator), " ");
chunks.push(
this.printExpressionInParenthesesIfNeeded(
expression.right,
isRightAssociative ? precedence : precedence + 1
)
);
return this.createSourceNode(expression, chunks);
}
private printExpressionInParenthesesIfNeeded(expression: lua.Expression, minPrecedenceToOmit?: number): SourceNode {
return this.needsParenthesis(expression, minPrecedenceToOmit)
? this.createSourceNode(expression, ["(", this.printExpression(expression), ")"])
: this.printExpression(expression);
}
private needsParenthesis(expression: lua.Expression, minPrecedenceToOmit?: number): boolean {
if (lua.isBinaryExpression(expression) || lua.isUnaryExpression(expression)) {
return (
minPrecedenceToOmit === undefined ||
LuaPrinter.operatorPrecedence[expression.operator] < minPrecedenceToOmit
);
} else {
return lua.isFunctionExpression(expression) || lua.isTableExpression(expression);
}
}
public printCallExpression(expression: lua.CallExpression): SourceNode {
const chunks = [];
chunks.push(this.printExpressionInParenthesesIfNeeded(expression.expression), "(");
if (expression.params) {
chunks.push(...this.printExpressionList(expression.params));
}
chunks.push(")");
return this.createSourceNode(expression, chunks);
}
public printMethodCallExpression(expression: lua.MethodCallExpression): SourceNode {
const chunks = [];
const prefix =
this.needsParenthesis(expression.prefixExpression) || lua.isStringLiteral(expression.prefixExpression)
? ["(", this.printExpression(expression.prefixExpression), ")"]
: [this.printExpression(expression.prefixExpression)];
const name = this.printIdentifier(expression.name);
chunks.push(...prefix, ":", name, "(");
if (expression.params) {
chunks.push(...this.printExpressionList(expression.params));
}
chunks.push(")");
return this.createSourceNode(expression, chunks);
}
public printIdentifier(expression: lua.Identifier): SourceNode {
return this.createSourceNode(
expression,
expression.text,
expression.originalName !== expression.text ? expression.originalName : undefined
);
}
public printTableIndexExpression(expression: lua.TableIndexExpression): SourceNode {
const chunks: SourceChunk[] = [];
chunks.push(this.printExpressionInParenthesesIfNeeded(expression.table));
if (lua.isStringLiteral(expression.index) && isValidLuaIdentifier(expression.index.value, this.options)) {
chunks.push(".", this.createSourceNode(expression.index, expression.index.value));
} else {
chunks.push("[", this.printExpression(expression.index), "]");
}
return this.createSourceNode(expression, chunks);
}
public printParenthesizedExpression(expression: lua.ParenthesizedExpression) {
return this.createSourceNode(expression, ["(", this.printExpression(expression.expression), ")"]);
}
public printOperator(kind: lua.Operator): SourceNode {
return new SourceNode(null, null, this.relativeSourcePath, LuaPrinter.operatorMap[kind]);
}
protected joinChunksWithComma(chunks: SourceChunk[]): SourceChunk[] {
return intersperse(chunks, ", ");
}
/**
* Returns true if the expression list (table field or parameters) should be printed on one line.
*/
protected isSimpleExpressionList(expressions: lua.Expression[]): boolean {
if (expressions.length <= 1) return true;
if (expressions.length > 4) return false;
return expressions.every(isSimpleExpression);
}
protected printExpressionList(expressions: lua.Expression[]): SourceChunk[] {
const chunks: SourceChunk[] = [];
if (this.isSimpleExpressionList(expressions)) {
chunks.push(...this.joinChunksWithComma(expressions.map(e => this.printExpression(e))));
} else {
chunks.push("\n");
this.pushIndent();
for (const [index, expression] of expressions.entries()) {
const tail = index < expressions.length - 1 ? ",\n" : "\n";
chunks.push(this.indent(), this.printExpression(expression), tail);
}
this.popIndent();
chunks.push(this.indent());
}
return chunks;
}
// The key difference between this and SourceNode.toStringWithSourceMap() is that SourceNodes with null line/column
// will not generate 'empty' mappings in the source map that point to nothing in the original TS.
private buildSourceMap(sourceRoot: string, rootSourceNode: SourceNode): SourceMapGenerator {
const map = new SourceMapGenerator({
file: path.basename(this.luaFile),
sourceRoot,
});
let generatedLine = 1;
let generatedColumn = 0;
let currentMapping: Mapping | undefined;
const isNewMapping = (sourceNode: SourceNode) => {
if (sourceNode.line === null) {
return false;
}
if (currentMapping === undefined) {
return true;
}
if (
currentMapping.generated.line === generatedLine &&
currentMapping.generated.column === generatedColumn &&
currentMapping.name === sourceNode.name
) {
return false;
}
return (
currentMapping.original.line !== sourceNode.line ||
currentMapping.original.column !== sourceNode.column ||
currentMapping.name !== sourceNode.name
);
};
const build = (sourceNode: SourceNode) => {
if (isNewMapping(sourceNode)) {
currentMapping = {
source: sourceNode.source,
original: { line: sourceNode.line, column: sourceNode.column },
generated: { line: generatedLine, column: generatedColumn },
name: sourceNode.name,
};
map.addMapping(currentMapping);
}
for (const chunk of sourceNode.children as SourceChunk[]) {
if (typeof chunk === "string") {
const lines = chunk.split("\n");
if (lines.length > 1) {
generatedLine += lines.length - 1;
generatedColumn = 0;
currentMapping = undefined; // Mappings end at newlines
}
generatedColumn += lines[lines.length - 1].length;
} else {
build(chunk);
}
}
};
build(rootSourceNode);
return map;
}
}