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2326 lines (2130 loc) · 104 KB
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/// <reference path="types.ts"/>
/// <reference path="core.ts"/>
/// <reference path="scanner.ts"/>
/// <reference path="parser.ts"/>
module ts {
interface EmitTextWriter extends TextWriter {
writeLiteral(s: string): void;
getTextPos(): number;
getLine(): number;
getColumn(): number;
}
var indentStrings: string[] = [];
function getIndentString(level: number) {
return indentStrings[level] || (indentStrings[level] = level === 0 ? "" : getIndentString(level - 1) + " ");
}
export function emitFiles(resolver: EmitResolver): EmitResult {
var program = resolver.getProgram();
var compilerHost = program.getCompilerHost();
var compilerOptions = program.getCompilerOptions();
var sourceMapDataList: SourceMapData[] = compilerOptions.sourceMap ? [] : undefined;
var diagnostics: Diagnostic[] = [];
function getSourceFilePathInNewDir(newDirPath: string, sourceFile: SourceFile) {
var sourceFilePath = getNormalizedPathFromPathCompoments(getNormalizedPathComponents(sourceFile.filename, compilerHost.getCurrentDirectory()));
sourceFilePath = sourceFilePath.replace(program.getCommonSourceDirectory(), "");
return combinePaths(newDirPath, sourceFilePath);
}
function shouldEmitToOwnFile(sourceFile: SourceFile) {
if (!(sourceFile.flags & NodeFlags.DeclarationFile)) {
if ((isExternalModule(sourceFile) || !compilerOptions.out) && !fileExtensionIs(sourceFile.filename, ".js")) {
return true;
}
}
}
function getOwnEmitOutputFilePath(sourceFile: SourceFile, extension: string) {
if (program.getCompilerOptions().outDir) {
var emitOutputFilePathWithoutExtension = getModuleNameFromFilename(getSourceFilePathInNewDir(program.getCompilerOptions().outDir, sourceFile));
}
else {
var emitOutputFilePathWithoutExtension = getModuleNameFromFilename(sourceFile.filename);
}
return emitOutputFilePathWithoutExtension + extension;
}
function isExternalModuleOrDeclarationFile(sourceFile: SourceFile) {
return isExternalModule(sourceFile) || (sourceFile.flags & NodeFlags.DeclarationFile) !== 0;
}
function getFirstConstructorWithBody(node: ClassDeclaration): ConstructorDeclaration {
return forEach(node.members, member => {
if (member.kind === SyntaxKind.Constructor && (<ConstructorDeclaration>member).body) {
return <ConstructorDeclaration>member;
}
});
}
function getAllAccessorDeclarations(node: ClassDeclaration, accessor: AccessorDeclaration) {
var firstAccessor: AccessorDeclaration;
var getAccessor: AccessorDeclaration;
var setAccessor: AccessorDeclaration;
forEach(node.members, (member: Declaration) => {
if ((member.kind === SyntaxKind.GetAccessor || member.kind === SyntaxKind.SetAccessor) &&
member.name.text === accessor.name.text &&
(member.flags & NodeFlags.Static) === (accessor.flags & NodeFlags.Static)) {
if (!firstAccessor) {
firstAccessor = <AccessorDeclaration>member;
}
if (member.kind === SyntaxKind.GetAccessor && !getAccessor) {
getAccessor = <AccessorDeclaration>member;
}
if (member.kind === SyntaxKind.SetAccessor && !setAccessor) {
setAccessor = <AccessorDeclaration>member;
}
}
});
return {
firstAccessor: firstAccessor,
getAccessor: getAccessor,
setAccessor: setAccessor
};
}
function createTextWriter(): EmitTextWriter {
var output = "";
var indent = 0;
var lineStart = true;
var lineCount = 0;
var linePos = 0;
function write(s: string) {
if (s && s.length) {
if (lineStart) {
output += getIndentString(indent);
lineStart = false;
}
output += s;
}
}
function writeLiteral(s: string) {
if (s && s.length) {
write(s);
var pos = 0;
while (pos < s.length) {
switch (s.charCodeAt(pos++)) {
case CharacterCodes.carriageReturn:
if (pos < s.length && s.charCodeAt(pos) === CharacterCodes.lineFeed) {
pos++;
}
case CharacterCodes.lineFeed:
lineCount++;
linePos = output.length - s.length + pos;
break;
}
}
}
}
function writeLine() {
if (!lineStart) {
output += sys.newLine;
lineCount++;
linePos = output.length;
lineStart = true;
}
}
return {
write: write,
writeLiteral: writeLiteral,
writeLine: writeLine,
increaseIndent: () => indent++,
decreaseIndent: () => indent--,
getTextPos: () => output.length,
getLine: () => lineCount + 1,
getColumn: () => lineStart ? indent * 4 + 1 : output.length - linePos + 1,
getText: () => output
};
}
// Get source text of node in the current source file. Unlike getSourceTextOfNode this function
// doesn't walk the parent chain to find the containing source file, rather it assumes the node is
// in the source file currently being processed.
var currentSourceFile: SourceFile;
function getSourceTextOfLocalNode(node: Node): string {
var text = currentSourceFile.text;
return text.substring(skipTrivia(text, node.pos), node.end);
}
function writeFile(filename: string, data: string) {
compilerHost.writeFile(filename, data, hostErrorMessage => {
diagnostics.push(createCompilerDiagnostic(Diagnostics.Could_not_write_file_0_Colon_1, filename, hostErrorMessage));
});
}
function emitJavaScript(jsFilePath: string, root?: SourceFile) {
var writer = createTextWriter();
var write = writer.write;
var writeLine = writer.writeLine;
var increaseIndent = writer.increaseIndent;
var decreaseIndent = writer.decreaseIndent;
var extendsEmitted = false;
/** write emitted output to disk*/
var writeEmittedFiles = writeJavaScriptFile;
/** Emit a node */
var emit = emitNode;
/** Called just before starting emit of a node */
var emitStart = function (node: Node) { }
/** Called once the emit of the node is done */
var emitEnd = function (node: Node) { }
/** Emit the text for the given token that comes after startPos
* This by default writes the text provided with the given tokenKind
* but if optional emitFn callback is provided the text is emitted using the callback instead of default text
* @param tokenKind the kind of the token to search and emit
* @param startPos the position in the source to start searching for the token
* @param emitFn if given will be invoked to emit the text instead of actual token emit */
var emitToken = emitTokenText;
/** Called to notify start of new source file emit */
var emitNewSourceFileStart = function (node: SourceFile) { }
/** Called to before starting the lexical scopes as in function/class in the emitted code because of node
* @param scopeDeclaration node that starts the lexical scope
* @param scopeName Optional name of this scope instead of deducing one from the declaration node */
var scopeEmitStart = function (scopeDeclaration: Node, scopeName?: string) { }
/** Called after coming out of the scope */
var scopeEmitEnd = function () { }
/** Sourcemap data that will get encoded */
var sourceMapData: SourceMapData;
function initializeEmitterWithSourceMaps() {
var sourceMapDir: string; // The directory in which sourcemap will be
// Current source map file and its index in the sources list
var sourceMapSourceIndex = -1;
// Names and its index map
var sourceMapNameIndexMap: Map<number> = {};
var sourceMapNameIndices: number[] = [];
function getSourceMapNameIndex() {
return sourceMapNameIndices.length ? sourceMapNameIndices[sourceMapNameIndices.length - 1] : -1;
}
// Last recorded and encoded spans
var lastRecordedSourceMapSpan: SourceMapSpan;
var lastEncodedSourceMapSpan: SourceMapSpan = {
emittedLine: 1,
emittedColumn: 1,
sourceLine: 1,
sourceColumn: 1,
sourceIndex: 0
};
var lastEncodedNameIndex = 0;
// Encoding for sourcemap span
function encodeLastRecordedSourceMapSpan() {
if (!lastRecordedSourceMapSpan || lastRecordedSourceMapSpan === lastEncodedSourceMapSpan) {
return;
}
var prevEncodedEmittedColumn = lastEncodedSourceMapSpan.emittedColumn;
// Line/Comma deliminators
if (lastEncodedSourceMapSpan.emittedLine == lastRecordedSourceMapSpan.emittedLine) {
// Emit comma to separate the entry
if (sourceMapData.sourceMapMappings) {
sourceMapData.sourceMapMappings += ",";
}
}
else {
// Emit line deliminators
for (var encodedLine = lastEncodedSourceMapSpan.emittedLine; encodedLine < lastRecordedSourceMapSpan.emittedLine; encodedLine++) {
sourceMapData.sourceMapMappings += ";";
}
prevEncodedEmittedColumn = 1;
}
// 1. Relative Column 0 based
sourceMapData.sourceMapMappings += base64VLQFormatEncode(lastRecordedSourceMapSpan.emittedColumn - prevEncodedEmittedColumn);
// 2. Relative sourceIndex
sourceMapData.sourceMapMappings += base64VLQFormatEncode(lastRecordedSourceMapSpan.sourceIndex - lastEncodedSourceMapSpan.sourceIndex);
// 3. Relative sourceLine 0 based
sourceMapData.sourceMapMappings += base64VLQFormatEncode(lastRecordedSourceMapSpan.sourceLine - lastEncodedSourceMapSpan.sourceLine);
// 4. Relative sourceColumn 0 based
sourceMapData.sourceMapMappings += base64VLQFormatEncode(lastRecordedSourceMapSpan.sourceColumn - lastEncodedSourceMapSpan.sourceColumn);
// 5. Relative namePosition 0 based
if (lastRecordedSourceMapSpan.nameIndex >= 0) {
sourceMapData.sourceMapMappings += base64VLQFormatEncode(lastRecordedSourceMapSpan.nameIndex - lastEncodedNameIndex);
lastEncodedNameIndex = lastRecordedSourceMapSpan.nameIndex;
}
lastEncodedSourceMapSpan = lastRecordedSourceMapSpan;
sourceMapData.sourceMapDecodedMappings.push(lastEncodedSourceMapSpan);
function base64VLQFormatEncode(inValue: number) {
function base64FormatEncode(inValue: number) {
if (inValue < 64) {
return 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'.charAt(inValue);
}
throw TypeError(inValue + ": not a 64 based value");
}
// Add a new least significant bit that has the sign of the value.
// if negative number the least significant bit that gets added to the number has value 1
// else least significant bit value that gets added is 0
// eg. -1 changes to binary : 01 [1] => 3
// +1 changes to binary : 01 [0] => 2
if (inValue < 0) {
inValue = ((-inValue) << 1) + 1;
}
else {
inValue = inValue << 1;
}
// Encode 5 bits at a time starting from least significant bits
var encodedStr = "";
do {
var currentDigit = inValue & 31; // 11111
inValue = inValue >> 5;
if (inValue > 0) {
// There are still more digits to decode, set the msb (6th bit)
currentDigit = currentDigit | 32;
}
encodedStr = encodedStr + base64FormatEncode(currentDigit);
} while (inValue > 0);
return encodedStr;
}
}
function recordSourceMapSpan(pos: number) {
var sourceLinePos = currentSourceFile.getLineAndCharacterFromPosition(pos);
var emittedLine = writer.getLine();
var emittedColumn = writer.getColumn();
// If this location wasnt recorded or the location in source is going backwards, record the span
if (!lastRecordedSourceMapSpan ||
lastRecordedSourceMapSpan.emittedLine != emittedLine ||
lastRecordedSourceMapSpan.emittedColumn != emittedColumn ||
lastRecordedSourceMapSpan.sourceLine > sourceLinePos.line ||
(lastRecordedSourceMapSpan.sourceLine === sourceLinePos.line && lastRecordedSourceMapSpan.sourceColumn > sourceLinePos.character)) {
// Encode the last recordedSpan before assigning new
encodeLastRecordedSourceMapSpan();
// New span
lastRecordedSourceMapSpan = {
emittedLine: emittedLine,
emittedColumn: emittedColumn,
sourceLine: sourceLinePos.line,
sourceColumn: sourceLinePos.character,
nameIndex: getSourceMapNameIndex(),
sourceIndex: sourceMapSourceIndex
};
}
else {
// Take the new pos instead since there is no change in emittedLine and column since last location
lastRecordedSourceMapSpan.sourceLine = sourceLinePos.line;
lastRecordedSourceMapSpan.sourceColumn = sourceLinePos.character;
}
}
function recordEmitNodeStartSpan(node: Node) {
// Get the token pos after skipping to the token (ignoring the leading trivia)
recordSourceMapSpan(ts.getTokenPosOfNode(node));
}
function recordEmitNodeEndSpan(node: Node) {
recordSourceMapSpan(node.end);
}
function writeTextWithSpanRecord(tokenKind: SyntaxKind, startPos: number, emitFn?: () => void) {
var tokenStartPos = ts.skipTrivia(currentSourceFile.text, startPos);
recordSourceMapSpan(tokenStartPos);
var tokenEndPos = emitTokenText(tokenKind, tokenStartPos, emitFn);
recordSourceMapSpan(tokenEndPos);
return tokenEndPos;
}
function recordNewSourceFileStart(node: SourceFile) {
// Add the the file to tsFilePaths
// If sourceroot option: Use the relative path corresponding to the common directory path
// otherwise source locations relative to map file location
var sourcesDirectoryPath = compilerOptions.sourceRoot ? program.getCommonSourceDirectory() : sourceMapDir;
sourceMapData.sourceMapSources.push(getRelativePathToDirectoryOrUrl(sourcesDirectoryPath,
node.filename,
compilerHost.getCurrentDirectory(),
/*isAbsolutePathAnUrl*/ true));
sourceMapSourceIndex = sourceMapData.sourceMapSources.length - 1;
// The one that can be used from program to get the actual source file
sourceMapData.inputSourceFileNames.push(node.filename);
}
function recordScopeNameOfNode(node: Node, scopeName?: string) {
function recordScopeNameIndex(scopeNameIndex: number) {
sourceMapNameIndices.push(scopeNameIndex);
}
function recordScopeNameStart(scopeName: string) {
var scopeNameIndex = -1;
if (scopeName) {
var parentIndex = getSourceMapNameIndex();
if (parentIndex !== -1) {
scopeName = sourceMapData.sourceMapNames[parentIndex] + "." + scopeName;
}
scopeNameIndex = getProperty(sourceMapNameIndexMap, scopeName);
if (scopeNameIndex === undefined) {
scopeNameIndex = sourceMapData.sourceMapNames.length;
sourceMapData.sourceMapNames.push(scopeName);
sourceMapNameIndexMap[scopeName] = scopeNameIndex;
}
}
recordScopeNameIndex(scopeNameIndex);
}
if (scopeName) {
// The scope was already given a name use it
recordScopeNameStart(scopeName);
}
else if (node.kind === SyntaxKind.FunctionDeclaration ||
node.kind === SyntaxKind.FunctionExpression ||
node.kind === SyntaxKind.Method ||
node.kind === SyntaxKind.GetAccessor ||
node.kind === SyntaxKind.SetAccessor ||
node.kind === SyntaxKind.ModuleDeclaration ||
node.kind === SyntaxKind.ClassDeclaration ||
node.kind === SyntaxKind.EnumDeclaration) {
// Declaration and has associated name use it
if ((<Declaration>node).name) {
scopeName = (<Declaration>node).name.text;
}
recordScopeNameStart(scopeName);
}
else {
// Block just use the name from upper level scope
recordScopeNameIndex(getSourceMapNameIndex());
}
}
function recordScopeNameEnd() {
sourceMapNameIndices.pop();
};
function writeJavaScriptAndSourceMapFile(emitOutput: string) {
// Write source map file
encodeLastRecordedSourceMapSpan();
writeFile(sourceMapData.sourceMapFilePath, JSON.stringify({
version: 3,
file: sourceMapData.sourceMapFile,
sourceRoot: sourceMapData.sourceMapSourceRoot,
sources: sourceMapData.sourceMapSources,
names: sourceMapData.sourceMapNames,
mappings: sourceMapData.sourceMapMappings
}));
sourceMapDataList.push(sourceMapData);
// Write sourcemap url to the js file and write the js file
writeJavaScriptFile(emitOutput + "//# sourceMappingURL=" + sourceMapData.jsSourceMappingURL);
}
// Initialize source map data
var sourceMapJsFile = getBaseFilename(normalizeSlashes(jsFilePath));
sourceMapData = {
sourceMapFilePath: jsFilePath + ".map",
jsSourceMappingURL: sourceMapJsFile + ".map",
sourceMapFile: sourceMapJsFile,
sourceMapSourceRoot: compilerOptions.sourceRoot || "",
sourceMapSources: [],
inputSourceFileNames: [],
sourceMapNames: [],
sourceMapMappings: "",
sourceMapDecodedMappings: []
};
// Normalize source root and make sure it has trailing "/" so that it can be used to combine paths with the
// relative paths of the sources list in the sourcemap
sourceMapData.sourceMapSourceRoot = ts.normalizeSlashes(sourceMapData.sourceMapSourceRoot);
if (sourceMapData.sourceMapSourceRoot.length && sourceMapData.sourceMapSourceRoot.charCodeAt(sourceMapData.sourceMapSourceRoot.length - 1) !== CharacterCodes.slash) {
sourceMapData.sourceMapSourceRoot += directorySeparator;
}
if (compilerOptions.mapRoot) {
sourceMapDir = normalizeSlashes(compilerOptions.mapRoot);
if (root) { // emitting single module file
// For modules or multiple emit files the mapRoot will have directory structure like the sources
// So if src\a.ts and src\lib\b.ts are compiled together user would be moving the maps into mapRoot\a.js.map and mapRoot\lib\b.js.map
sourceMapDir = getDirectoryPath(getSourceFilePathInNewDir(sourceMapDir, root));
}
if (!isRootedDiskPath(sourceMapDir) && !isUrl(sourceMapDir)) {
// The relative paths are relative to the common directory
sourceMapDir = combinePaths(program.getCommonSourceDirectory(), sourceMapDir);
sourceMapData.jsSourceMappingURL = getRelativePathToDirectoryOrUrl(
getDirectoryPath(normalizePath(jsFilePath)), // get the relative sourceMapDir path based on jsFilePath
combinePaths(sourceMapDir, sourceMapData.jsSourceMappingURL), // this is where user expects to see sourceMap
compilerHost.getCurrentDirectory(),
/*isAbsolutePathAnUrl*/ true);
}
else {
sourceMapData.jsSourceMappingURL = combinePaths(sourceMapDir, sourceMapData.jsSourceMappingURL);
}
}
else {
sourceMapDir = getDirectoryPath(normalizePath(jsFilePath));
}
function emitNodeWithMap(node: Node) {
if (node) {
if (node.kind != SyntaxKind.SourceFile) {
recordEmitNodeStartSpan(node);
emitNode(node);
recordEmitNodeEndSpan(node);
}
else {
recordNewSourceFileStart(<SourceFile>node);
emitNode(node);
}
}
}
writeEmittedFiles = writeJavaScriptAndSourceMapFile;
emit = emitNodeWithMap;
emitStart = recordEmitNodeStartSpan;
emitEnd = recordEmitNodeEndSpan;
emitToken = writeTextWithSpanRecord;
emitNewSourceFileStart = recordNewSourceFileStart;
scopeEmitStart = recordScopeNameOfNode;
scopeEmitEnd = recordScopeNameEnd;
}
function writeJavaScriptFile(emitOutput: string) {
writeFile(jsFilePath, emitOutput);
}
function emitTokenText(tokenKind: SyntaxKind, startPos: number, emitFn?: () => void) {
var tokenString = tokenToString(tokenKind);
if (emitFn) {
emitFn();
}
else {
write(tokenString);
}
return startPos + tokenString.length;
}
function emitOptional(prefix: string, node: Node) {
if (node) {
write(prefix);
emit(node);
}
}
function emitCommaList(nodes: Node[], count?: number) {
if (!(count >= 0)) count = nodes.length;
if (nodes) {
for (var i = 0; i < count; i++) {
if (i) write(", ");
emit(nodes[i]);
}
}
}
function emitMultiLineList(nodes: Node[]) {
if (nodes) {
for (var i = 0; i < nodes.length; i++) {
if (i) write(",");
writeLine();
emit(nodes[i]);
}
}
}
function emitLines(nodes: Node[]) {
emitLinesStartingAt(nodes, /*startIndex*/ 0);
}
function emitLinesStartingAt(nodes: Node[], startIndex: number): void {
for (var i = startIndex; i < nodes.length; i++) {
writeLine();
emit(nodes[i]);
}
}
function emitLiteral(node: LiteralExpression) {
var text = getSourceTextOfLocalNode(node);
if (node.kind === SyntaxKind.StringLiteral && compilerOptions.sourceMap) {
writer.writeLiteral(text);
}
else {
write(text);
}
}
// This function specifically handles numeric/string literals for enum and accessor 'identifiers'.
// In a sense, it does not actually emit identifiers as much as it declares a name for a specific property.
function emitQuotedIdentifier(node: Identifier) {
if (node.kind === SyntaxKind.StringLiteral) {
emitLiteral(node);
}
else {
write("\"");
if (node.kind === SyntaxKind.NumericLiteral) {
write(node.text);
}
else {
write(getSourceTextOfLocalNode(node));
}
write("\"");
}
}
function isNonExpressionIdentifier(node: Identifier) {
var parent = node.parent;
switch (parent.kind) {
case SyntaxKind.Parameter:
case SyntaxKind.VariableDeclaration:
case SyntaxKind.Property:
case SyntaxKind.PropertyAssignment:
case SyntaxKind.EnumMember:
case SyntaxKind.Method:
case SyntaxKind.FunctionDeclaration:
case SyntaxKind.GetAccessor:
case SyntaxKind.SetAccessor:
case SyntaxKind.FunctionExpression:
case SyntaxKind.ClassDeclaration:
case SyntaxKind.InterfaceDeclaration:
case SyntaxKind.EnumDeclaration:
case SyntaxKind.ModuleDeclaration:
case SyntaxKind.ImportDeclaration:
return (<Declaration>parent).name === node;
case SyntaxKind.BreakStatement:
case SyntaxKind.ContinueStatement:
case SyntaxKind.ExportAssignment:
return false;
case SyntaxKind.LabelledStatement:
return (<LabelledStatement>node.parent).label === node;
case SyntaxKind.CatchBlock:
return (<CatchBlock>node.parent).variable === node;
}
}
function emitIdentifier(node: Identifier) {
if (!isNonExpressionIdentifier(node)) {
var prefix = resolver.getExpressionNamePrefix(node);
if (prefix) {
write(prefix);
write(".");
}
}
write(getSourceTextOfLocalNode(node));
}
function emitThis(node: Node) {
if (resolver.getNodeCheckFlags(node) & NodeCheckFlags.LexicalThis) {
write("_this");
}
else {
write("this");
}
}
function emitSuper(node: Node) {
var flags = resolver.getNodeCheckFlags(node);
if (flags & NodeCheckFlags.SuperInstance) {
write("_super.prototype");
}
else if (flags & NodeCheckFlags.SuperStatic) {
write("_super");
}
else {
write("super");
}
}
function emitArrayLiteral(node: ArrayLiteral) {
if (node.flags & NodeFlags.MultiLine) {
write("[");
increaseIndent();
emitMultiLineList(node.elements);
decreaseIndent();
writeLine();
write("]");
}
else {
write("[");
emitCommaList(node.elements);
write("]");
}
}
function emitObjectLiteral(node: ObjectLiteral) {
if (!node.properties.length) {
write("{}");
}
else if (node.flags & NodeFlags.MultiLine) {
write("{");
increaseIndent();
emitMultiLineList(node.properties);
decreaseIndent();
writeLine();
write("}");
}
else {
write("{ ");
emitCommaList(node.properties);
write(" }");
}
}
function emitPropertyAssignment(node: PropertyDeclaration) {
emit(node.name);
write(": ");
emit(node.initializer);
}
function emitPropertyAccess(node: PropertyAccess) {
var text = resolver.getPropertyAccessSubstitution(node);
if (text) {
write(text);
return;
}
emit(node.left);
write(".");
emit(node.right);
}
function emitIndexedAccess(node: IndexedAccess) {
emit(node.object);
write("[");
emit(node.index);
write("]");
}
function emitCallExpression(node: CallExpression) {
var superCall = false;
if (node.func.kind === SyntaxKind.SuperKeyword) {
write("_super");
superCall = true;
}
else {
emit(node.func);
superCall = node.func.kind === SyntaxKind.PropertyAccess && (<PropertyAccess>node.func).left.kind === SyntaxKind.SuperKeyword;
}
if (superCall) {
write(".call(");
emitThis(node.func);
if (node.arguments.length) {
write(", ");
emitCommaList(node.arguments);
}
write(")");
}
else {
write("(");
emitCommaList(node.arguments);
write(")");
}
}
function emitNewExpression(node: NewExpression) {
write("new ");
emit(node.func);
if (node.arguments) {
write("(");
emitCommaList(node.arguments);
write(")");
}
}
function emitParenExpression(node: ParenExpression) {
if (node.expression.kind === SyntaxKind.TypeAssertion) {
var operand = (<TypeAssertion>node.expression).operand;
// Make sure we consider all nested cast expressions, e.g.:
// (<any><number><any>-A).x;
while (operand.kind == SyntaxKind.TypeAssertion) {
operand = (<TypeAssertion>operand).operand;
}
// We have an expression of the form: (<Type>SubExpr)
// Emitting this as (SubExpr) is really not desirable. We would like to emit the subexpr as is.
// Omitting the parentheses, however, could cause change in the semantics of the generated
// code if the casted expression has a lower precedence than the rest of the expression, e.g.:
// (<any>new A).foo should be emitted as (new A).foo and not new A.foo
// (<any>typeof A).toString() should be emitted as (typeof A).toString() and not typeof A.toString()
// new (<any>A()) should be emitted as new (A()) and not new A()
// (<any>function foo() { })() should be emitted as an IIF (function foo(){})() and not declaration function foo(){} ()
if (operand.kind !== SyntaxKind.PrefixOperator && operand.kind !== SyntaxKind.PostfixOperator && operand.kind !== SyntaxKind.NewExpression &&
!(operand.kind === SyntaxKind.CallExpression && node.parent.kind === SyntaxKind.NewExpression) &&
!(operand.kind === SyntaxKind.FunctionExpression && node.parent.kind === SyntaxKind.CallExpression)) {
emit(operand);
return;
}
}
write("(");
emit(node.expression);
write(")");
}
function emitUnaryExpression(node: UnaryExpression) {
if (node.kind === SyntaxKind.PrefixOperator) {
write(tokenToString(node.operator));
}
// In some cases, we need to emit a space between the operator and the operand. One obvious case
// is when the operator is an identifer, like delete or typeof. We also need to do this for plus
// and minus expressions in certain cases. Specifically, consider the following two cases (parens
// are just for clarity of exposition, and not part of the source code):
//
// (+(+1))
// (+(++1))
//
// We need to emit a space in both cases. In the first case, the absence of a space will make
// the resulting expression a prefix increment operation. And in the second, it will make the resulting
// expression a prefix increment whose operand is a plus expression - (++(+x))
// The same is true of minus of course.
if (node.operator >= SyntaxKind.Identifier) {
write(" ");
}
else if (node.kind === SyntaxKind.PrefixOperator && node.operand.kind === SyntaxKind.PrefixOperator) {
var operand = <UnaryExpression>node.operand;
if (node.operator === SyntaxKind.PlusToken && (operand.operator === SyntaxKind.PlusToken || operand.operator === SyntaxKind.PlusPlusToken)) {
write(" ");
}
else if (node.operator === SyntaxKind.MinusToken && (operand.operator === SyntaxKind.MinusToken || operand.operator === SyntaxKind.MinusMinusToken)) {
write(" ");
}
}
emit(node.operand);
if (node.kind === SyntaxKind.PostfixOperator) {
write(tokenToString(node.operator));
}
}
function emitBinaryExpression(node: BinaryExpression) {
emit(node.left);
if (node.operator !== SyntaxKind.CommaToken) write(" ");
write(tokenToString(node.operator));
write(" ");
emit(node.right);
}
function emitConditionalExpression(node: ConditionalExpression) {
emit(node.condition);
write(" ? ");
emit(node.whenTrue);
write(" : ");
emit(node.whenFalse);
}
function emitBlock(node: Block) {
emitToken(SyntaxKind.OpenBraceToken, node.pos);
increaseIndent();
scopeEmitStart(node.parent);
if (node.kind === SyntaxKind.ModuleBlock) {
Debug.assert(node.parent.kind === SyntaxKind.ModuleDeclaration);
emitCaptureThisForNodeIfNecessary(node.parent);
}
emitLines(node.statements);
decreaseIndent();
writeLine();
emitToken(SyntaxKind.CloseBraceToken, node.statements.end);
scopeEmitEnd();
}
function emitEmbeddedStatement(node: Node) {
if (node.kind === SyntaxKind.Block) {
write(" ");
emit(<Block>node);
}
else {
increaseIndent();
writeLine();
emit(node);
decreaseIndent();
}
}
function emitExpressionStatement(node: ExpressionStatement) {
var isArrowExpression = node.expression.kind === SyntaxKind.ArrowFunction;
if (isArrowExpression) write("(");
emit(node.expression);
if (isArrowExpression) write(")");
write(";");
}
function emitIfStatement(node: IfStatement) {
var endPos = emitToken(SyntaxKind.IfKeyword, node.pos);
write(" ");
endPos = emitToken(SyntaxKind.OpenParenToken, endPos);
emit(node.expression);
emitToken(SyntaxKind.CloseParenToken, node.expression.end);
emitEmbeddedStatement(node.thenStatement);
if (node.elseStatement) {
writeLine();
emitToken(SyntaxKind.ElseKeyword, node.thenStatement.end);
if (node.elseStatement.kind === SyntaxKind.IfStatement) {
write(" ");
emit(node.elseStatement);
}
else {
emitEmbeddedStatement(node.elseStatement);
}
}
}
function emitDoStatement(node: DoStatement) {
write("do");
emitEmbeddedStatement(node.statement);
if (node.statement.kind === SyntaxKind.Block) {
write(" ");
}
else {
writeLine();
}
write("while (");
emit(node.expression);
write(");");
}
function emitWhileStatement(node: WhileStatement) {
write("while (");
emit(node.expression);
write(")");
emitEmbeddedStatement(node.statement);
}
function emitForStatement(node: ForStatement) {
var endPos = emitToken(SyntaxKind.ForKeyword, node.pos);
write(" ");
endPos = emitToken(SyntaxKind.OpenParenToken, endPos);
if (node.declarations) {
emitToken(SyntaxKind.VarKeyword, endPos);
write(" ");
emitCommaList(node.declarations);
}
if (node.initializer) {
emit(node.initializer);
}
write(";");
emitOptional(" ", node.condition);
write(";");
emitOptional(" ", node.iterator);
write(")");
emitEmbeddedStatement(node.statement);
}
function emitForInStatement(node: ForInStatement) {
var endPos = emitToken(SyntaxKind.ForKeyword, node.pos);
write(" ");
endPos = emitToken(SyntaxKind.OpenParenToken, endPos);
if (node.declaration) {
emitToken(SyntaxKind.VarKeyword, endPos);
write(" ");
emit(node.declaration);
}
else {
emit(node.variable);
}
write(" in ");
emit(node.expression);
emitToken(SyntaxKind.CloseParenToken, node.expression.end);
emitEmbeddedStatement(node.statement);
}
function emitBreakOrContinueStatement(node: BreakOrContinueStatement) {
emitToken(node.kind === SyntaxKind.BreakStatement ? SyntaxKind.BreakKeyword : SyntaxKind.ContinueKeyword, node.pos);
emitOptional(" ", node.label);
write(";");
}
function emitReturnStatement(node: ReturnStatement) {
emitToken(SyntaxKind.ReturnKeyword, node.pos);
emitOptional(" ", node.expression);
write(";");
}
function emitWithStatement(node: WhileStatement) {
write("with (");
emit(node.expression);
write(")");
emitEmbeddedStatement(node.statement);
}
function emitSwitchStatement(node: SwitchStatement) {
var endPos = emitToken(SyntaxKind.SwitchKeyword, node.pos);
write(" ");
emitToken(SyntaxKind.OpenParenToken, endPos);
emit(node.expression);
endPos = emitToken(SyntaxKind.CloseParenToken, node.expression.end);
write(" ");
emitToken(SyntaxKind.OpenBraceToken, endPos);
increaseIndent();
emitLines(node.clauses);
decreaseIndent();
writeLine();
emitToken(SyntaxKind.CloseBraceToken, node.clauses.end);
}
function emitCaseOrDefaultClause(node: CaseOrDefaultClause) {
if (node.kind === SyntaxKind.CaseClause) {
write("case ");
emit(node.expression);
write(":");
}
else {
write("default:");
}
increaseIndent();
emitLines(node.statements);
decreaseIndent();
}
function emitThrowStatement(node: ThrowStatement) {
write("throw ");
emit(node.expression);
write(";");
}