/*
* Copyright 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.dev.js;
import com.google.gwt.core.ext.linker.StatementRanges;
import com.google.gwt.core.ext.linker.impl.StandardStatementRanges;
import com.google.gwt.dev.js.ast.HasName;
import com.google.gwt.dev.js.ast.JsArrayAccess;
import com.google.gwt.dev.js.ast.JsArrayLiteral;
import com.google.gwt.dev.js.ast.JsBinaryOperation;
import com.google.gwt.dev.js.ast.JsBinaryOperator;
import com.google.gwt.dev.js.ast.JsBlock;
import com.google.gwt.dev.js.ast.JsBooleanLiteral;
import com.google.gwt.dev.js.ast.JsBreak;
import com.google.gwt.dev.js.ast.JsCase;
import com.google.gwt.dev.js.ast.JsCatch;
import com.google.gwt.dev.js.ast.JsConditional;
import com.google.gwt.dev.js.ast.JsContext;
import com.google.gwt.dev.js.ast.JsContinue;
import com.google.gwt.dev.js.ast.JsDebugger;
import com.google.gwt.dev.js.ast.JsDefault;
import com.google.gwt.dev.js.ast.JsDoWhile;
import com.google.gwt.dev.js.ast.JsEmpty;
import com.google.gwt.dev.js.ast.JsExprStmt;
import com.google.gwt.dev.js.ast.JsExpression;
import com.google.gwt.dev.js.ast.JsFor;
import com.google.gwt.dev.js.ast.JsForIn;
import com.google.gwt.dev.js.ast.JsFunction;
import com.google.gwt.dev.js.ast.JsIf;
import com.google.gwt.dev.js.ast.JsInvocation;
import com.google.gwt.dev.js.ast.JsLabel;
import com.google.gwt.dev.js.ast.JsName;
import com.google.gwt.dev.js.ast.JsNameOf;
import com.google.gwt.dev.js.ast.JsNameRef;
import com.google.gwt.dev.js.ast.JsNew;
import com.google.gwt.dev.js.ast.JsNullLiteral;
import com.google.gwt.dev.js.ast.JsNumberLiteral;
import com.google.gwt.dev.js.ast.JsObjectLiteral;
import com.google.gwt.dev.js.ast.JsOperator;
import com.google.gwt.dev.js.ast.JsParameter;
import com.google.gwt.dev.js.ast.JsPostfixOperation;
import com.google.gwt.dev.js.ast.JsPrefixOperation;
import com.google.gwt.dev.js.ast.JsProgram;
import com.google.gwt.dev.js.ast.JsProgramFragment;
import com.google.gwt.dev.js.ast.JsPropertyInitializer;
import com.google.gwt.dev.js.ast.JsRegExp;
import com.google.gwt.dev.js.ast.JsReturn;
import com.google.gwt.dev.js.ast.JsStatement;
import com.google.gwt.dev.js.ast.JsStringLiteral;
import com.google.gwt.dev.js.ast.JsSwitch;
import com.google.gwt.dev.js.ast.JsSwitchMember;
import com.google.gwt.dev.js.ast.JsThisRef;
import com.google.gwt.dev.js.ast.JsThrow;
import com.google.gwt.dev.js.ast.JsTry;
import com.google.gwt.dev.js.ast.JsUnaryOperator;
import com.google.gwt.dev.js.ast.JsVars;
import com.google.gwt.dev.js.ast.JsVisitor;
import com.google.gwt.dev.js.ast.JsWhile;
import com.google.gwt.dev.js.ast.JsVars.JsVar;
import com.google.gwt.dev.util.TextOutput;
import com.google.gwt.dev.util.collect.HashSet;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Set;
import java.util.List;
import java.util.regex.Pattern;
/**
* Produces text output from a JavaScript AST.
*/
public class JsToStringGenerationVisitor extends JsVisitor {
private static final char[] CHARS_BREAK = "break".toCharArray();
private static final char[] CHARS_CASE = "case".toCharArray();
private static final char[] CHARS_CATCH = "catch".toCharArray();
private static final char[] CHARS_CONTINUE = "continue".toCharArray();
private static final char[] CHARS_DEBUGGER = "debugger".toCharArray();
private static final char[] CHARS_DEFAULT = "default".toCharArray();
private static final char[] CHARS_DO = "do".toCharArray();
private static final char[] CHARS_ELSE = "else".toCharArray();
private static final char[] CHARS_FALSE = "false".toCharArray();
private static final char[] CHARS_FINALLY = "finally".toCharArray();
private static final char[] CHARS_FOR = "for".toCharArray();
private static final char[] CHARS_FUNCTION = "function".toCharArray();
private static final char[] CHARS_IF = "if".toCharArray();
private static final char[] CHARS_IN = "in".toCharArray();
private static final char[] CHARS_NEW = "new".toCharArray();
private static final char[] CHARS_NULL = "null".toCharArray();
private static final char[] CHARS_RETURN = "return".toCharArray();
private static final char[] CHARS_SWITCH = "switch".toCharArray();
private static final char[] CHARS_THIS = "this".toCharArray();
private static final char[] CHARS_THROW = "throw".toCharArray();
private static final char[] CHARS_TRUE = "true".toCharArray();
private static final char[] CHARS_TRY = "try".toCharArray();
private static final char[] CHARS_VAR = "var".toCharArray();
private static final char[] CHARS_WHILE = "while".toCharArray();
private static final char[] HEX_DIGITS = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
'E', 'F'};
/**
* How many lines of code to print inside of a JsBlock when printing terse.
*/
private static final int JSBLOCK_LINES_TO_PRINT = 3;
/**
* A variable name is valid if it contains only letters, numbers, _, $ and
* does not begin with a number. There are actually other valid variable
* names, such as ones that contain escaped Unicode characters, but we
* surround those names with quotes in property initializers to be safe.
*/
private static final Pattern VALID_NAME_PATTERN = Pattern.compile("[a-zA-Z_$][\\w$]*");
protected boolean needSemi = true;
/**
* "Global" blocks are either the global block of a fragment, or a block
* nested directly within some other global block. This definition matters
* because the statements designated by statementEnds and statementStarts are
* those that appear directly within these global blocks.
*/
private Set<JsBlock> globalBlocks = new HashSet<JsBlock>();
private final TextOutput p;
private ArrayList<Integer> statementEnds = new ArrayList<Integer>();
private ArrayList<Integer> statementStarts = new ArrayList<Integer>();
public JsToStringGenerationVisitor(TextOutput out) {
this.p = out;
}
public StatementRanges getStatementRanges() {
return new StandardStatementRanges(statementStarts, statementEnds);
}
@Override
public boolean visit(JsArrayAccess x, JsContext<JsExpression> ctx) {
JsExpression arrayExpr = x.getArrayExpr();
_parenPush(x, arrayExpr, false);
accept(arrayExpr);
_parenPop(x, arrayExpr, false);
_lsquare();
accept(x.getIndexExpr());
_rsquare();
return false;
}
@Override
public boolean visit(JsArrayLiteral x, JsContext<JsExpression> ctx) {
_lsquare();
boolean sep = false;
for (Object element : x.getExpressions()) {
JsExpression arg = (JsExpression) element;
sep = _sepCommaOptSpace(sep);
_parenPushIfCommaExpr(arg);
accept(arg);
_parenPopIfCommaExpr(arg);
}
_rsquare();
return false;
}
@Override
public boolean visit(JsBinaryOperation x, JsContext<JsExpression> ctx) {
JsBinaryOperator op = x.getOperator();
JsExpression arg1 = x.getArg1();
_parenPush(x, arg1, !op.isLeftAssociative());
accept(arg1);
if (op.isKeyword()) {
_parenPopOrSpace(x, arg1, !op.isLeftAssociative());
} else {
_parenPop(x, arg1, !op.isLeftAssociative());
_spaceOpt();
}
p.print(op.getSymbol());
JsExpression arg2 = x.getArg2();
if (_spaceCalc(op, arg2)) {
_parenPushOrSpace(x, arg2, op.isLeftAssociative());
} else {
_spaceOpt();
_parenPush(x, arg2, op.isLeftAssociative());
}
accept(arg2);
_parenPop(x, arg2, op.isLeftAssociative());
return false;
}
@Override
public boolean visit(JsBlock x, JsContext<JsStatement> ctx) {
printJsBlock(x, true, true);
return false;
}
@Override
public boolean visit(JsBooleanLiteral x, JsContext<JsExpression> ctx) {
if (x.getValue()) {
_true();
} else {
_false();
}
return false;
}
@Override
public boolean visit(JsBreak x, JsContext<JsStatement> ctx) {
_break();
JsNameRef label = x.getLabel();
if (label != null) {
_space();
_nameRef(label);
}
return false;
}
@Override
public boolean visit(JsCase x, JsContext<JsSwitchMember> ctx) {
_case();
_space();
accept(x.getCaseExpr());
_colon();
_newlineOpt();
indent();
for (Object element : x.getStmts()) {
JsStatement stmt = (JsStatement) element;
needSemi = true;
accept(stmt);
if (needSemi) {
_semi();
}
_newlineOpt();
}
outdent();
needSemi = false;
return false;
}
@Override
public boolean visit(JsCatch x, JsContext<JsCatch> ctx) {
_spaceOpt();
_catch();
_spaceOpt();
_lparen();
_nameDef(x.getParameter().getName());
// Optional catch condition.
//
JsExpression catchCond = x.getCondition();
if (catchCond != null) {
_space();
_if();
_space();
accept(catchCond);
}
_rparen();
_spaceOpt();
accept(x.getBody());
return false;
}
@Override
public boolean visit(JsConditional x, JsContext<JsExpression> ctx) {
// Associativity: for the then and else branches, it is safe to insert
// another
// ternary expression, but if the test expression is a ternary, it should
// get parentheses around it.
{
JsExpression testExpression = x.getTestExpression();
_parenPush(x, testExpression, true);
accept(testExpression);
_parenPop(x, testExpression, true);
}
_questionMark();
{
JsExpression thenExpression = x.getThenExpression();
_parenPush(x, thenExpression, false);
accept(thenExpression);
_parenPop(x, thenExpression, false);
}
_colon();
{
JsExpression elseExpression = x.getElseExpression();
_parenPush(x, elseExpression, false);
accept(elseExpression);
_parenPop(x, elseExpression, false);
}
return false;
}
@Override
public boolean visit(JsContinue x, JsContext<JsStatement> ctx) {
_continue();
JsNameRef label = x.getLabel();
if (label != null) {
_space();
_nameRef(label);
}
return false;
}
@Override
public boolean visit(JsDebugger x, JsContext<JsStatement> ctx) {
_debugger();
return false;
}
@Override
public boolean visit(JsDefault x, JsContext<JsSwitchMember> ctx) {
_default();
_colon();
indent();
for (Object element : x.getStmts()) {
JsStatement stmt = (JsStatement) element;
needSemi = true;
accept(stmt);
if (needSemi) {
_semi();
}
_newlineOpt();
}
outdent();
needSemi = false;
return false;
}
@Override
public boolean visit(JsDoWhile x, JsContext<JsStatement> ctx) {
_do();
_nestedPush(x.getBody(), true);
accept(x.getBody());
_nestedPop(x.getBody());
if (needSemi) {
_semi();
_newlineOpt();
} else {
_spaceOpt();
needSemi = true;
}
_while();
_spaceOpt();
_lparen();
accept(x.getCondition());
_rparen();
return false;
}
@Override
public boolean visit(JsEmpty x, JsContext<JsStatement> ctx) {
return false;
}
@Override
public boolean visit(JsExprStmt x, JsContext<JsStatement> ctx) {
boolean surroundWithParentheses = JsFirstExpressionVisitor.exec(x);
if (surroundWithParentheses) {
_lparen();
}
JsExpression expr = x.getExpression();
accept(expr);
if (surroundWithParentheses) {
_rparen();
}
return false;
}
@Override
public boolean visit(JsFor x, JsContext<JsStatement> ctx) {
_for();
_spaceOpt();
_lparen();
// The init expressions or var decl.
//
if (x.getInitExpr() != null) {
accept(x.getInitExpr());
} else if (x.getInitVars() != null) {
accept(x.getInitVars());
}
_semi();
// The loop test.
//
if (x.getCondition() != null) {
_spaceOpt();
accept(x.getCondition());
}
_semi();
// The incr expression.
//
if (x.getIncrExpr() != null) {
_spaceOpt();
accept(x.getIncrExpr());
}
_rparen();
_nestedPush(x.getBody(), false);
accept(x.getBody());
_nestedPop(x.getBody());
return false;
}
@Override
public boolean visit(JsForIn x, JsContext<JsStatement> ctx) {
_for();
_spaceOpt();
_lparen();
if (x.getIterVarName() != null) {
_var();
_space();
_nameDef(x.getIterVarName());
if (x.getIterExpr() != null) {
_spaceOpt();
_assignment();
_spaceOpt();
accept(x.getIterExpr());
}
} else {
// Just a name ref.
//
accept(x.getIterExpr());
}
_space();
_in();
_space();
accept(x.getObjExpr());
_rparen();
_nestedPush(x.getBody(), false);
accept(x.getBody());
_nestedPop(x.getBody());
return false;
}
// function foo(a, b) {
// stmts...
// }
//
@Override
public boolean visit(JsFunction x, JsContext<JsExpression> ctx) {
_function();
// Functions can be anonymous.
//
if (x.getName() != null) {
_space();
_nameOf(x);
}
_lparen();
boolean sep = false;
for (Object element : x.getParameters()) {
JsParameter param = (JsParameter) element;
sep = _sepCommaOptSpace(sep);
accept(param);
}
_rparen();
accept(x.getBody());
needSemi = true;
return false;
}
@Override
public boolean visit(JsIf x, JsContext<JsStatement> ctx) {
_if();
_spaceOpt();
_lparen();
accept(x.getIfExpr());
_rparen();
JsStatement thenStmt = x.getThenStmt();
_nestedPush(thenStmt, false);
accept(thenStmt);
_nestedPop(thenStmt);
JsStatement elseStmt = x.getElseStmt();
if (elseStmt != null) {
if (needSemi) {
_semi();
_newlineOpt();
} else {
_spaceOpt();
needSemi = true;
}
_else();
boolean elseIf = elseStmt instanceof JsIf;
if (!elseIf) {
_nestedPush(elseStmt, true);
} else {
_space();
}
accept(elseStmt);
if (!elseIf) {
_nestedPop(elseStmt);
}
}
return false;
}
@Override
public boolean visit(JsInvocation x, JsContext<JsExpression> ctx) {
JsExpression qualifier = x.getQualifier();
_parenPush(x, qualifier, false);
accept(qualifier);
_parenPop(x, qualifier, false);
_lparen();
boolean sep = false;
for (Object element : x.getArguments()) {
JsExpression arg = (JsExpression) element;
sep = _sepCommaOptSpace(sep);
_parenPushIfCommaExpr(arg);
accept(arg);
_parenPopIfCommaExpr(arg);
}
_rparen();
return false;
}
@Override
public boolean visit(JsLabel x, JsContext<JsStatement> ctx) {
_nameOf(x);
_colon();
_spaceOpt();
accept(x.getStmt());
return false;
}
@Override
public boolean visit(JsNameOf x, JsContext<JsExpression> ctx) {
printStringLiteral(x.getName().getShortIdent());
return false;
}
@Override
public boolean visit(JsNameRef x, JsContext<JsExpression> ctx) {
JsExpression q = x.getQualifier();
if (q != null) {
_parenPush(x, q, false);
accept(q);
if (q instanceof JsNumberLiteral) {
/**
* Fix for Issue #3796. "42.foo" is not allowed, but
* "42 .foo" is.
*/
_space();
}
_parenPop(x, q, false);
_dot();
}
_nameRef(x);
return false;
}
@Override
public boolean visit(JsNew x, JsContext<JsExpression> ctx) {
_new();
_space();
JsExpression ctorExpr = x.getConstructorExpression();
boolean needsParens = JsConstructExpressionVisitor.exec(ctorExpr);
if (needsParens) {
_lparen();
}
accept(ctorExpr);
if (needsParens) {
_rparen();
}
/*
* If a constructor call has no arguments, it may simply be
* replaced with "new Constructor" with no parentheses.
*/
List<JsExpression> args = x.getArguments();
if (args.size() > 0) {
_lparen();
boolean sep = false;
for (JsExpression arg : args) {
sep = _sepCommaOptSpace(sep);
_parenPushIfCommaExpr(arg);
accept(arg);
_parenPopIfCommaExpr(arg);
}
_rparen();
}
return false;
}
@Override
public boolean visit(JsNullLiteral x, JsContext<JsExpression> ctx) {
_null();
return false;
}
@Override
public boolean visit(JsNumberLiteral x, JsContext<JsExpression> ctx) {
double dvalue = x.getValue();
long lvalue = (long) dvalue;
if (lvalue == dvalue) {
p.print(Long.toString(lvalue));
} else {
p.print(Double.toString(dvalue));
}
return false;
}
@Override
public boolean visit(JsObjectLiteral x, JsContext<JsExpression> ctx) {
_lbrace();
boolean sep = false;
for (Object element : x.getPropertyInitializers()) {
sep = _sepCommaOptSpace(sep);
JsPropertyInitializer propInit = (JsPropertyInitializer) element;
printLabel : {
JsExpression labelExpr = propInit.getLabelExpr();
// labels can be either string, integral, or decimal literals
if (labelExpr instanceof JsStringLiteral) {
String propName = ((JsStringLiteral) labelExpr).getValue();
if (VALID_NAME_PATTERN.matcher(propName).matches()
&& !JsKeywords.isKeyword(propName)) {
p.print(propName);
break printLabel;
}
}
accept(labelExpr);
}
_colon();
JsExpression valueExpr = propInit.getValueExpr();
_parenPushIfCommaExpr(valueExpr);
accept(valueExpr);
_parenPopIfCommaExpr(valueExpr);
}
_rbrace();
return false;
}
@Override
public boolean visit(JsParameter x, JsContext<JsParameter> ctx) {
_nameOf(x);
return false;
}
@Override
public boolean visit(JsPostfixOperation x, JsContext<JsExpression> ctx) {
JsUnaryOperator op = x.getOperator();
JsExpression arg = x.getArg();
// unary operators always associate correctly (I think)
_parenPush(x, arg, false);
accept(arg);
_parenPop(x, arg, false);
p.print(op.getSymbol());
return false;
}
@Override
public boolean visit(JsPrefixOperation x, JsContext<JsExpression> ctx) {
JsUnaryOperator op = x.getOperator();
p.print(op.getSymbol());
JsExpression arg = x.getArg();
if (_spaceCalc(op, arg)) {
_space();
}
// unary operators always associate correctly (I think)
_parenPush(x, arg, false);
accept(arg);
_parenPop(x, arg, false);
return false;
}
@Override
public boolean visit(JsProgram x, JsContext<JsProgram> ctx) {
p.print("<JsProgram>");
return false;
}
@Override
public boolean visit(JsProgramFragment x, JsContext<JsProgramFragment> ctx) {
p.print("<JsProgramFragment>");
return false;
}
@Override
public boolean visit(JsPropertyInitializer x,
JsContext<JsPropertyInitializer> ctx) {
// Since there are separators, we actually print the property init
// in visit(JsObjectLiteral).
//
return false;
}
@Override
public boolean visit(JsRegExp x, JsContext<JsExpression> ctx) {
_slash();
p.print(x.getPattern());
_slash();
String flags = x.getFlags();
if (flags != null) {
p.print(flags);
}
return false;
}
@Override
public boolean visit(JsReturn x, JsContext<JsStatement> ctx) {
_return();
JsExpression expr = x.getExpr();
if (expr != null) {
_space();
accept(expr);
}
return false;
}
@Override
public boolean visit(JsStringLiteral x, JsContext<JsExpression> ctx) {
printStringLiteral(x.getValue());
return false;
}
@Override
public boolean visit(JsSwitch x, JsContext<JsStatement> ctx) {
_switch();
_spaceOpt();
_lparen();
accept(x.getExpr());
_rparen();
_spaceOpt();
_blockOpen();
acceptList(x.getCases());
_blockClose();
return false;
}
@Override
public boolean visit(JsThisRef x, JsContext<JsExpression> ctx) {
_this();
return false;
}
@Override
public boolean visit(JsThrow x, JsContext<JsStatement> ctx) {
_throw();
_space();
accept(x.getExpr());
return false;
}
@Override
public boolean visit(JsTry x, JsContext<JsStatement> ctx) {
_try();
_spaceOpt();
accept(x.getTryBlock());
acceptList(x.getCatches());
JsBlock finallyBlock = x.getFinallyBlock();
if (finallyBlock != null) {
_spaceOpt();
_finally();
_spaceOpt();
accept(finallyBlock);
}
return false;
}
@Override
public boolean visit(JsVar x, JsContext<JsVar> ctx) {
_nameOf(x);
JsExpression initExpr = x.getInitExpr();
if (initExpr != null) {
_spaceOpt();
_assignment();
_spaceOpt();
_parenPushIfCommaExpr(initExpr);
accept(initExpr);
_parenPopIfCommaExpr(initExpr);
}
return false;
}
@Override
public boolean visit(JsVars x, JsContext<JsStatement> ctx) {
_var();
_space();
boolean sep = false;
for (JsVar var : x) {
sep = _sepCommaOptSpace(sep);
accept(var);
}
return false;
}
@Override
public boolean visit(JsWhile x, JsContext<JsStatement> ctx) {
_while();
_spaceOpt();
_lparen();
accept(x.getCondition());
_rparen();
_nestedPush(x.getBody(), false);
accept(x.getBody());
_nestedPop(x.getBody());
return false;
}
// CHECKSTYLE_NAMING_OFF
protected void _newline() {
p.newline();
}
protected void _newlineOpt() {
p.newlineOpt();
}
protected void printJsBlock(JsBlock x, boolean truncate, boolean finalNewline) {
boolean needBraces = !x.isGlobalBlock();
if (needBraces) {
// Open braces.
//
_blockOpen();
}
int count = 0;
for (Iterator<JsStatement> iter = x.getStatements().iterator(); iter.hasNext(); ++count) {
boolean isGlobal = x.isGlobalBlock() || globalBlocks.contains(x);
if (truncate && count > JSBLOCK_LINES_TO_PRINT) {
p.print("[...]");
_newlineOpt();
break;
}
JsStatement stmt = iter.next();
needSemi = true;
boolean shouldRecordPositions = isGlobal && !(stmt instanceof JsBlock);
boolean stmtIsGlobalBlock = false;
if (isGlobal) {
if (stmt instanceof JsBlock) {
// A block inside a global block is still considered global
stmtIsGlobalBlock = true;
globalBlocks.add((JsBlock) stmt);
}
}
if (shouldRecordPositions) {
statementStarts.add(p.getPosition());
}
accept(stmt);
if (stmtIsGlobalBlock) {
globalBlocks.remove(stmt);
}
if (needSemi) {
/*
* Special treatment of function decls: If they are the only item in a
* statement (i.e. not part of an assignment operation), just give them
* a newline instead of a semi.
*/
boolean functionStmt = stmt instanceof JsExprStmt
&& ((JsExprStmt) stmt).getExpression() instanceof JsFunction;
/*
* Special treatment of the last statement in a block: only a few
* statements at the end of a block require semicolons.
*/
boolean lastStatement = !iter.hasNext() && needBraces
&& !JsRequiresSemiVisitor.exec(stmt);
if (functionStmt) {
if (lastStatement) {
_newlineOpt();
} else {
_newline();
}
} else {
if (lastStatement) {
_semiOpt();
} else {
_semi();
}
_newlineOpt();
}
}
if (shouldRecordPositions) {
assert (statementStarts.size() == statementEnds.size() + 1);
statementEnds.add(p.getPosition());
}
}
if (needBraces) {
// _blockClose() modified
p.indentOut();
p.print('}');
if (finalNewline) {
_newlineOpt();
}
}
needSemi = false;
}
private void _assignment() {
p.print('=');
}
private void _blockClose() {
p.indentOut();
p.print('}');
_newlineOpt();
}
private void _blockOpen() {
p.print('{');
p.indentIn();
_newlineOpt();
}
private void _break() {
p.print(CHARS_BREAK);
}
private void _case() {
p.print(CHARS_CASE);
}
private void _catch() {
p.print(CHARS_CATCH);
}
private void _colon() {
p.print(':');
}
private void _continue() {
p.print(CHARS_CONTINUE);
}
private void _debugger() {
p.print(CHARS_DEBUGGER);
}
private void _default() {
p.print(CHARS_DEFAULT);
}
private void _do() {
p.print(CHARS_DO);
}
private void _dot() {
p.print('.');
}
private void _else() {
p.print(CHARS_ELSE);
}
private void _false() {
p.print(CHARS_FALSE);
}
private void _finally() {
p.print(CHARS_FINALLY);
}
private void _for() {
p.print(CHARS_FOR);
}
private void _function() {
p.print(CHARS_FUNCTION);
}
private void _if() {
p.print(CHARS_IF);
}
private void _in() {
p.print(CHARS_IN);
}
private void _lbrace() {
p.print('{');
}
private void _lparen() {
p.print('(');
}
private void _lsquare() {
p.print('[');
}
private void _nameDef(JsName name) {
p.print(name.getShortIdent());
}
private void _nameOf(HasName hasName) {
_nameDef(hasName.getName());
}
private void _nameRef(JsNameRef nameRef) {
p.print(nameRef.getShortIdent());
}
private boolean _nestedPop(JsStatement statement) {
boolean pop = !(statement instanceof JsBlock);
if (pop) {
p.indentOut();
}
return pop;
}
private boolean _nestedPush(JsStatement statement, boolean needSpace) {
boolean push = !(statement instanceof JsBlock);
if (push) {
if (needSpace) {
_space();
}
p.indentIn();
_newlineOpt();
} else {
_spaceOpt();
}
return push;
}
private void _new() {
p.print(CHARS_NEW);
}
private void _null() {
p.print(CHARS_NULL);
}
private boolean _parenCalc(JsExpression parent, JsExpression child,
boolean wrongAssoc) {
int parentPrec = JsPrecedenceVisitor.exec(parent);
int childPrec = JsPrecedenceVisitor.exec(child);
return (parentPrec > childPrec || (parentPrec == childPrec && wrongAssoc));
}
private boolean _parenPop(JsExpression parent, JsExpression child,
boolean wrongAssoc) {
boolean doPop = _parenCalc(parent, child, wrongAssoc);
if (doPop) {
_rparen();
}
return doPop;
}
private boolean _parenPopIfCommaExpr(JsExpression x) {
boolean doPop = x instanceof JsBinaryOperation
&& ((JsBinaryOperation) x).getOperator() == JsBinaryOperator.COMMA;
if (doPop) {
_rparen();
}
return doPop;
}
private boolean _parenPopOrSpace(JsExpression parent, JsExpression child,
boolean wrongAssoc) {
boolean doPop = _parenCalc(parent, child, wrongAssoc);
if (doPop) {
_rparen();
} else {
_space();
}
return doPop;
}
private boolean _parenPush(JsExpression parent, JsExpression child,
boolean wrongAssoc) {
boolean doPush = _parenCalc(parent, child, wrongAssoc);
if (doPush) {
_lparen();
}
return doPush;
}
private boolean _parenPushIfCommaExpr(JsExpression x) {
boolean doPush = x instanceof JsBinaryOperation
&& ((JsBinaryOperation) x).getOperator() == JsBinaryOperator.COMMA;
if (doPush) {
_lparen();
}
return doPush;
}
private boolean _parenPushOrSpace(JsExpression parent, JsExpression child,
boolean wrongAssoc) {
boolean doPush = _parenCalc(parent, child, wrongAssoc);
if (doPush) {
_lparen();
} else {
_space();
}
return doPush;
}
private void _questionMark() {
p.print('?');
}
private void _rbrace() {
p.print('}');
}
private void _return() {
p.print(CHARS_RETURN);
}
private void _rparen() {
p.print(')');
}
private void _rsquare() {
p.print(']');
}
private void _semi() {
p.print(';');
}
private void _semiOpt() {
p.printOpt(';');
}
private boolean _sepCommaOptSpace(boolean sep) {
if (sep) {
p.print(',');
_spaceOpt();
}
return true;
}
private void _slash() {
p.print('/');
}
private void _space() {
p.print(' ');
}
/**
* Decide whether, if <code>op</code> is printed followed by <code>arg</code>,
* there needs to be a space between the operator and expression.
*
* @return <code>true</code> if a space needs to be printed
*/
private boolean _spaceCalc(JsOperator op, JsExpression arg) {
if (op.isKeyword()) {
return true;
}
if (arg instanceof JsBinaryOperation) {
JsBinaryOperation binary = (JsBinaryOperation) arg;
/*
* If the binary operation has a higher precedence than op, then it won't
* be parenthesized, so check the first argument of the binary operation.
*/
if (binary.getOperator().getPrecedence() > op.getPrecedence()) {
return _spaceCalc(op, binary.getArg1());
}
return false;
}
if (arg instanceof JsPrefixOperation) {
JsOperator op2 = ((JsPrefixOperation) arg).getOperator();
return (op == JsBinaryOperator.SUB || op == JsUnaryOperator.NEG)
&& (op2 == JsUnaryOperator.DEC || op2 == JsUnaryOperator.NEG)
|| (op == JsBinaryOperator.ADD && op2 == JsUnaryOperator.INC);
}
if (arg instanceof JsNumberLiteral) {
JsNumberLiteral literal = (JsNumberLiteral) arg;
return (op == JsBinaryOperator.SUB || op == JsUnaryOperator.NEG)
&& (literal.getValue() < 0);
}
return false;
}
private void _spaceOpt() {
p.printOpt(' ');
}
private void _switch() {
p.print(CHARS_SWITCH);
}
private void _this() {
p.print(CHARS_THIS);
}
private void _throw() {
p.print(CHARS_THROW);
}
private void _true() {
p.print(CHARS_TRUE);
}
private void _try() {
p.print(CHARS_TRY);
}
private void _var() {
p.print(CHARS_VAR);
}
private void _while() {
p.print(CHARS_WHILE);
}
// CHECKSTYLE_NAMING_ON
/**
* Escapes any closing XML tags embedded in <code>str</code>, which could
* potentially cause a parse failure in a browser, for example, embedding a
* closing <code><script></code> tag.
*
* @param str an unescaped literal; May be null
*/
private void escapeClosingTags(StringBuffer str) {
if (str == null) {
return;
}
int index = 0;
while ((index = str.indexOf("</", index)) != -1) {
str.insert(index + 1, '\\');
}
}
private void indent() {
p.indentIn();
}
private void outdent() {
p.indentOut();
}
/**
* Adapted from
* {@link com.google.gwt.dev.js.rhino.ScriptRuntime#escapeString(String)}. The
* difference is that we quote with either " or ' depending on which
* one is used less inside the string.
*/
private void printStringLiteral(String value) {
char[] chars = value.toCharArray();
final int n = chars.length;
int quoteCount = 0;
int aposCount = 0;
for (int i = 0; i < n; ++i) {
switch (chars[i]) {
case '"':
++quoteCount;
break;
case '\'':
++aposCount;
break;
}
}
StringBuffer result = new StringBuffer(value.length() + 16);
char quoteChar = (quoteCount < aposCount) ? '"' : '\'';
p.print(quoteChar);
for (int i = 0; i < n; ++i) {
char c = chars[i];
if (' ' <= c && c <= '~' && c != quoteChar && c != '\\') {
// an ordinary print character (like C isprint())
result.append(c);
continue;
}
int escape = -1;
switch (c) {
case 0:
escape = '0';
break;
case '\b':
escape = 'b';
break;
case '\f':
escape = 'f';
break;
case '\n':
escape = 'n';
break;
case '\r':
escape = 'r';
break;
case '\t':
escape = 't';
break;
case '"':
escape = '"';
break; // only reach here if == quoteChar
case '\'':
escape = '\'';
break; // only reach here if == quoteChar
case '\\':
escape = '\\';
break;
}
if (escape >= 0) {
// an \escaped sort of character
result.append('\\');
result.append((char) escape);
} else {
int hexSize;
if (c < 256) {
// 2-digit hex
result.append("\\x");
hexSize = 2;
} else {
// Unicode.
result.append("\\u");
hexSize = 4;
}
// append hexadecimal form of ch left-padded with 0
for (int shift = (hexSize - 1) * 4; shift >= 0; shift -= 4) {
int digit = 0xf & (c >> shift);
result.append(HEX_DIGITS[digit]);
}
}
}
result.append(quoteChar);
escapeClosingTags(result);
p.print(result.toString());
}
}