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Groovy: A powerful multi-faceted language for the JVM
/*
* This file is adapted from the Antlr4 Java grammar which has the following license
*
* Copyright (c) 2013 Terence Parr, Sam Harwell
* All rights reserved.
* [The "BSD licence"]
*
* http://www.opensource.org/licenses/bsd-license.php
*
* Subsequent modifications by the Groovy community have been done under the Apache License v2:
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
/**
* The Groovy grammar is based on the official grammar for Java:
* https://github.com/antlr/grammars-v4/blob/master/java/Java.g4
*/
lexer grammar GroovyLexer;
options {
superClass = AbstractLexer;
}
@header {
import java.util.*;
import org.apache.groovy.util.Maps;
import static org.apache.groovy.parser.antlr4.SemanticPredicates.*;
}
@members {
private boolean errorIgnored;
private long tokenIndex;
private int lastTokenType;
private int invalidDigitCount;
/**
* Record the index and token type of the current token while emitting tokens.
*/
@Override
public void emit(Token token) {
this.tokenIndex++;
int tokenType = token.getType();
if (Token.DEFAULT_CHANNEL == token.getChannel()) {
this.lastTokenType = tokenType;
}
if (RollBackOne == tokenType) {
this.rollbackOneChar();
}
super.emit(token);
}
private static final int[] REGEX_CHECK_ARRAY = {
DEC,
INC,
THIS,
RBRACE,
RBRACK,
RPAREN,
GStringEnd,
NullLiteral,
StringLiteral,
BooleanLiteral,
IntegerLiteral,
FloatingPointLiteral,
Identifier, CapitalizedIdentifier
};
static {
Arrays.sort(REGEX_CHECK_ARRAY);
}
private boolean isRegexAllowed() {
return (Arrays.binarySearch(REGEX_CHECK_ARRAY, this.lastTokenType) < 0);
}
/**
* just a hook, which will be overrided by GroovyLangLexer
*/
protected void rollbackOneChar() {}
private static class Paren {
private String text;
private int lastTokenType;
private int line;
private int column;
public Paren(String text, int lastTokenType, int line, int column) {
this.text = text;
this.lastTokenType = lastTokenType;
this.line = line;
this.column = column;
}
public String getText() {
return this.text;
}
public int getLastTokenType() {
return this.lastTokenType;
}
@SuppressWarnings("unused")
public int getLine() {
return line;
}
@SuppressWarnings("unused")
public int getColumn() {
return column;
}
@Override
public int hashCode() {
return (int) (text.hashCode() * line + column);
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof Paren)) {
return false;
}
Paren other = (Paren) obj;
return this.text.equals(other.text) && (this.line == other.line && this.column == other.column);
}
}
protected void enterParenCallback(String text) {}
protected void exitParenCallback(String text) {}
private final Deque parenStack = new ArrayDeque<>(32);
private void enterParen() {
String text = getText();
enterParenCallback(text);
parenStack.push(new Paren(text, this.lastTokenType, getLine(), getCharPositionInLine()));
}
private void exitParen() {
String text = getText();
exitParenCallback(text);
Paren paren = parenStack.peek();
if (null == paren) return;
parenStack.pop();
}
private boolean isInsideParens() {
Paren paren = parenStack.peek();
// We just care about "(", "[" and "?[", inside which the new lines will be ignored.
// Notice: the new lines between "{" and "}" can not be ignored.
if (null == paren) {
return false;
}
String text = paren.getText();
return ("(".equals(text) && TRY != paren.getLastTokenType()) // we don't treat try-paren(i.e. try (....)) as parenthesis
|| "[".equals(text) || "?[".equals(text);
}
private void ignoreTokenInsideParens() {
if (!this.isInsideParens()) {
return;
}
this.setChannel(Token.HIDDEN_CHANNEL);
}
private void ignoreMultiLineCommentConditionally() {
if (!this.isInsideParens() && isFollowedByWhiteSpaces(_input)) {
return;
}
this.setChannel(Token.HIDDEN_CHANNEL);
}
@Override
public int getSyntaxErrorSource() {
return GroovySyntaxError.LEXER;
}
@Override
public int getErrorLine() {
return getLine();
}
@Override
public int getErrorColumn() {
return getCharPositionInLine() + 1;
}
@Override
public int popMode() {
try {
return super.popMode();
} catch (EmptyStackException ignore) { // raised when parens are unmatched: too many ), ], or }
}
return Integer.MIN_VALUE;
}
private void addComment(int type) {
String text = _input.getText(Interval.of(_tokenStartCharIndex, getCharIndex() - 1));
}
private static boolean isJavaIdentifierStartAndNotIdentifierIgnorable(int codePoint) {
return Character.isJavaIdentifierStart(codePoint) && !Character.isIdentifierIgnorable(codePoint);
}
private static boolean isJavaIdentifierPartAndNotIdentifierIgnorable(int codePoint) {
return Character.isJavaIdentifierPart(codePoint) && !Character.isIdentifierIgnorable(codePoint);
}
public boolean isErrorIgnored() {
return errorIgnored;
}
public void setErrorIgnored(boolean errorIgnored) {
this.errorIgnored = errorIgnored;
}
}
// §3.10.5 String Literals
StringLiteral
: GStringQuotationMark DqStringCharacter* GStringQuotationMark
| SqStringQuotationMark SqStringCharacter* SqStringQuotationMark
| Slash { this.isRegexAllowed() && _input.LA(1) != '*' }? SlashyStringCharacter+ Slash
| TdqStringQuotationMark TdqStringCharacter* TdqStringQuotationMark
| TsqStringQuotationMark TsqStringCharacter* TsqStringQuotationMark
| DollarSlashyGStringQuotationMarkBegin DollarSlashyStringCharacter+ DollarSlashyGStringQuotationMarkEnd
;
GStringBegin
: GStringQuotationMark DqStringCharacter* Dollar -> pushMode(DQ_GSTRING_MODE), pushMode(GSTRING_TYPE_SELECTOR_MODE)
;
TdqGStringBegin
: TdqStringQuotationMark TdqStringCharacter* Dollar -> type(GStringBegin), pushMode(TDQ_GSTRING_MODE), pushMode(GSTRING_TYPE_SELECTOR_MODE)
;
SlashyGStringBegin
: Slash { this.isRegexAllowed() && _input.LA(1) != '*' }? SlashyStringCharacter* Dollar { isFollowedByJavaLetterInGString(_input) }? -> type(GStringBegin), pushMode(SLASHY_GSTRING_MODE), pushMode(GSTRING_TYPE_SELECTOR_MODE)
;
DollarSlashyGStringBegin
: DollarSlashyGStringQuotationMarkBegin DollarSlashyStringCharacter* Dollar { isFollowedByJavaLetterInGString(_input) }? -> type(GStringBegin), pushMode(DOLLAR_SLASHY_GSTRING_MODE), pushMode(GSTRING_TYPE_SELECTOR_MODE)
;
mode DQ_GSTRING_MODE;
GStringEnd
: GStringQuotationMark -> popMode
;
GStringPart
: Dollar -> pushMode(GSTRING_TYPE_SELECTOR_MODE)
;
GStringCharacter
: DqStringCharacter -> more
;
mode TDQ_GSTRING_MODE;
TdqGStringEnd
: TdqStringQuotationMark -> type(GStringEnd), popMode
;
TdqGStringPart
: Dollar -> type(GStringPart), pushMode(GSTRING_TYPE_SELECTOR_MODE)
;
TdqGStringCharacter
: TdqStringCharacter -> more
;
mode SLASHY_GSTRING_MODE;
SlashyGStringEnd
: Dollar? Slash -> type(GStringEnd), popMode
;
SlashyGStringPart
: Dollar { isFollowedByJavaLetterInGString(_input) }? -> type(GStringPart), pushMode(GSTRING_TYPE_SELECTOR_MODE)
;
SlashyGStringCharacter
: SlashyStringCharacter -> more
;
mode DOLLAR_SLASHY_GSTRING_MODE;
DollarSlashyGStringEnd
: DollarSlashyGStringQuotationMarkEnd -> type(GStringEnd), popMode
;
DollarSlashyGStringPart
: Dollar { isFollowedByJavaLetterInGString(_input) }? -> type(GStringPart), pushMode(GSTRING_TYPE_SELECTOR_MODE)
;
DollarSlashyGStringCharacter
: DollarSlashyStringCharacter -> more
;
mode GSTRING_TYPE_SELECTOR_MODE;
GStringLBrace
: '{' { this.enterParen(); } -> type(LBRACE), popMode, pushMode(DEFAULT_MODE)
;
GStringIdentifier
: IdentifierInGString -> type(Identifier), popMode, pushMode(GSTRING_PATH_MODE)
;
mode GSTRING_PATH_MODE;
GStringPathPart
: Dot IdentifierInGString
;
RollBackOne
: . {
// a trick to handle GStrings followed by EOF properly
int readChar = _input.LA(-1);
if (EOF == _input.LA(1) && ('"' == readChar || '/' == readChar)) {
setType(GStringEnd);
} else {
setChannel(HIDDEN);
}
} -> popMode
;
mode DEFAULT_MODE;
// character in the double quotation string. e.g. "a"
fragment
DqStringCharacter
: ~["\r\n\\$]
| EscapeSequence
;
// character in the single quotation string. e.g. 'a'
fragment
SqStringCharacter
: ~['\r\n\\]
| EscapeSequence
;
// character in the triple double quotation string. e.g. """a"""
fragment TdqStringCharacter
: ~["\\$]
| GStringQuotationMark { _input.LA(1) != '"' || _input.LA(2) != '"' || _input.LA(3) == '"' && (_input.LA(4) != '"' || _input.LA(5) != '"') }?
| EscapeSequence
;
// character in the triple single quotation string. e.g. '''a'''
fragment TsqStringCharacter
: ~['\\]
| SqStringQuotationMark { _input.LA(1) != '\'' || _input.LA(2) != '\'' || _input.LA(3) == '\'' && (_input.LA(4) != '\'' || _input.LA(5) != '\'') }?
| EscapeSequence
;
// character in the slashy string. e.g. /a/
fragment SlashyStringCharacter
: SlashEscape
| Dollar { !isFollowedByJavaLetterInGString(_input) }?
| ~[/$\u0000]
;
// character in the dollar slashy string. e.g. $/a/$
fragment DollarSlashyStringCharacter
: DollarDollarEscape
| DollarSlashDollarEscape { _input.LA(-4) != '$' }?
| DollarSlashEscape { _input.LA(1) != '$' }?
| Slash { _input.LA(1) != '$' }?
| Dollar { !isFollowedByJavaLetterInGString(_input) }?
| ~[/$\u0000]
;
// Groovy keywords
AS : 'as';
DEF : 'def';
IN : 'in';
TRAIT : 'trait';
THREADSAFE : 'threadsafe'; // reserved keyword
// the reserved type name of Java10
VAR : 'var';
// §3.9 Keywords
BuiltInPrimitiveType
: BOOLEAN
| CHAR
| BYTE
| SHORT
| INT
| LONG
| FLOAT
| DOUBLE
;
ABSTRACT : 'abstract';
ASSERT : 'assert';
fragment
BOOLEAN : 'boolean';
BREAK : 'break';
YIELD : 'yield';
fragment
BYTE : 'byte';
CASE : 'case';
CATCH : 'catch';
fragment
CHAR : 'char';
CLASS : 'class';
CONST : 'const';
CONTINUE : 'continue';
DEFAULT : 'default';
DO : 'do';
fragment
DOUBLE : 'double';
ELSE : 'else';
ENUM : 'enum';
EXTENDS : 'extends';
FINAL : 'final';
FINALLY : 'finally';
fragment
FLOAT : 'float';
FOR : 'for';
IF : 'if';
GOTO : 'goto';
IMPLEMENTS : 'implements';
IMPORT : 'import';
INSTANCEOF : 'instanceof';
fragment
INT : 'int';
INTERFACE : 'interface';
fragment
LONG : 'long';
NATIVE : 'native';
NEW : 'new';
NON_SEALED : 'non-sealed';
PACKAGE : 'package';
PERMITS : 'permits';
PRIVATE : 'private';
PROTECTED : 'protected';
PUBLIC : 'public';
RECORD : 'record';
RETURN : 'return';
SEALED : 'sealed';
fragment
SHORT : 'short';
STATIC : 'static';
STRICTFP : 'strictfp';
SUPER : 'super';
SWITCH : 'switch';
SYNCHRONIZED : 'synchronized';
THIS : 'this';
THROW : 'throw';
THROWS : 'throws';
TRANSIENT : 'transient';
TRY : 'try';
VOID : 'void';
VOLATILE : 'volatile';
WHILE : 'while';
// §3.10.1 Integer Literals
IntegerLiteral
: ( DecimalIntegerLiteral
| HexIntegerLiteral
| OctalIntegerLiteral
| BinaryIntegerLiteral
) (Underscore { require(errorIgnored, "Number ending with underscores is invalid", -1, true); })?
// !!! Error Alternative !!!
| Zero ([0-9] { invalidDigitCount++; })+ { require(errorIgnored, "Invalid octal number", -(invalidDigitCount + 1), true); } IntegerTypeSuffix?
;
fragment
Zero
: '0'
;
fragment
DecimalIntegerLiteral
: DecimalNumeral IntegerTypeSuffix?
;
fragment
HexIntegerLiteral
: HexNumeral IntegerTypeSuffix?
;
fragment
OctalIntegerLiteral
: OctalNumeral IntegerTypeSuffix?
;
fragment
BinaryIntegerLiteral
: BinaryNumeral IntegerTypeSuffix?
;
fragment
IntegerTypeSuffix
: [lLiIgG]
;
fragment
DecimalNumeral
: Zero
| NonZeroDigit (Digits? | Underscores Digits)
;
fragment
Digits
: Digit (DigitOrUnderscore* Digit)?
;
fragment
Digit
: Zero
| NonZeroDigit
;
fragment
NonZeroDigit
: [1-9]
;
fragment
DigitOrUnderscore
: Digit
| Underscore
;
fragment
Underscores
: Underscore+
;
fragment
Underscore
: '_'
;
fragment
HexNumeral
: Zero [xX] HexDigits
;
fragment
HexDigits
: HexDigit (HexDigitOrUnderscore* HexDigit)?
;
fragment
HexDigit
: [0-9a-fA-F]
;
fragment
HexDigitOrUnderscore
: HexDigit
| Underscore
;
fragment
OctalNumeral
: Zero Underscores? OctalDigits
;
fragment
OctalDigits
: OctalDigit (OctalDigitOrUnderscore* OctalDigit)?
;
fragment
OctalDigit
: [0-7]
;
fragment
OctalDigitOrUnderscore
: OctalDigit
| Underscore
;
fragment
BinaryNumeral
: Zero [bB] BinaryDigits
;
fragment
BinaryDigits
: BinaryDigit (BinaryDigitOrUnderscore* BinaryDigit)?
;
fragment
BinaryDigit
: [01]
;
fragment
BinaryDigitOrUnderscore
: BinaryDigit
| Underscore
;
// §3.10.2 Floating-Point Literals
FloatingPointLiteral
: ( DecimalFloatingPointLiteral
| HexadecimalFloatingPointLiteral
) (Underscore { require(errorIgnored, "Number ending with underscores is invalid", -1, true); })?
;
fragment
DecimalFloatingPointLiteral
: Digits? Dot Digits ExponentPart? FloatTypeSuffix?
| Digits ExponentPart FloatTypeSuffix?
| Digits FloatTypeSuffix
;
fragment
ExponentPart
: ExponentIndicator SignedInteger
;
fragment
ExponentIndicator
: [eE]
;
fragment
SignedInteger
: Sign? Digits
;
fragment
Sign
: [+\-]
;
fragment
FloatTypeSuffix
: [fFdDgG]
;
fragment
HexadecimalFloatingPointLiteral
: HexSignificand BinaryExponent FloatTypeSuffix?
;
fragment
HexSignificand
: HexNumeral Dot?
| Zero [xX] HexDigits? Dot HexDigits
;
fragment
BinaryExponent
: BinaryExponentIndicator SignedInteger
;
fragment
BinaryExponentIndicator
: [pP]
;
fragment
Dot : '.'
;
// §3.10.3 Boolean Literals
BooleanLiteral
: 'true'
| 'false'
;
// §3.10.6 Escape Sequences for Character and String Literals
fragment
EscapeSequence
: Backslash [btnfrs"'\\]
| OctalEscape
| UnicodeEscape
| DollarEscape
| LineEscape
;
fragment
OctalEscape
: Backslash OctalDigit
| Backslash OctalDigit OctalDigit
| Backslash ZeroToThree OctalDigit OctalDigit
;
// Groovy allows 1 or more u's after the backslash
fragment
UnicodeEscape
: Backslash 'u' HexDigit HexDigit HexDigit HexDigit
;
fragment
ZeroToThree
: [0-3]
;
// Groovy Escape Sequences
fragment
DollarEscape
: Backslash Dollar
;
fragment
LineEscape
: Backslash LineTerminator
;
fragment
LineTerminator
: '\r'? '\n' | '\r'
;
fragment
SlashEscape
: Backslash Slash
;
fragment
Backslash
: '\\'
;
fragment
Slash
: '/'
;
fragment
Dollar
: '$'
;
fragment
GStringQuotationMark
: '"'
;
fragment
SqStringQuotationMark
: '\''
;
fragment
TdqStringQuotationMark
: '"""'
;
fragment
TsqStringQuotationMark
: '\'\'\''
;
fragment
DollarSlashyGStringQuotationMarkBegin
: '$/'
;
fragment
DollarSlashyGStringQuotationMarkEnd
: '/$'
;
// escaped forward slash
fragment
DollarSlashEscape
: '$/'
;
// escaped dollar sign
fragment
DollarDollarEscape
: '$$'
;
// escaped dollar slashy string delimiter
fragment
DollarSlashDollarEscape
: '$/$'
;
// §3.10.7 The Null Literal
NullLiteral
: 'null'
;
// Groovy Operators
RANGE_INCLUSIVE : '..';
RANGE_EXCLUSIVE_LEFT : '<..';
RANGE_EXCLUSIVE_RIGHT : '..<';
RANGE_EXCLUSIVE_FULL : '<..<';
SPREAD_DOT : '*.';
SAFE_DOT : '?.';
SAFE_INDEX : '?[' { this.enterParen(); } -> pushMode(DEFAULT_MODE);
SAFE_CHAIN_DOT : '??.';
ELVIS : '?:';
METHOD_POINTER : '.&';
METHOD_REFERENCE : '::';
REGEX_FIND : '=~';
REGEX_MATCH : '==~';
POWER : '**';
POWER_ASSIGN : '**=';
SPACESHIP : '<=>';
IDENTICAL : '===';
NOT_IDENTICAL : '!==';
ARROW : '->';
// !internalPromise will be parsed as !in ternalPromise, so semantic predicates are necessary
NOT_INSTANCEOF : '!instanceof' { isFollowedBy(_input, ' ', '\t', '\r', '\n') }?;
NOT_IN : '!in' { isFollowedBy(_input, ' ', '\t', '\r', '\n', '[', '(', '{') }?;
// §3.11 Separators
LPAREN : '(' { this.enterParen(); } -> pushMode(DEFAULT_MODE);
RPAREN : ')' { this.exitParen(); } -> popMode;
LBRACE : '{' { this.enterParen(); } -> pushMode(DEFAULT_MODE);
RBRACE : '}' { this.exitParen(); } -> popMode;
LBRACK : '[' { this.enterParen(); } -> pushMode(DEFAULT_MODE);
RBRACK : ']' { this.exitParen(); } -> popMode;
SEMI : ';';
COMMA : ',';
DOT : Dot;
// §3.12 Operators
ASSIGN : '=';
GT : '>';
LT : '<';
NOT : '!';
BITNOT : '~';
QUESTION : '?';
COLON : ':';
EQUAL : '==';
LE : '<=';
GE : '>=';
NOTEQUAL : '!=';
AND : '&&';
OR : '||';
INC : '++';
DEC : '--';
ADD : '+';
SUB : '-';
MUL : '*';
DIV : Slash;
BITAND : '&';
BITOR : '|';
XOR : '^';
MOD : '%';
ADD_ASSIGN : '+=';
SUB_ASSIGN : '-=';
MUL_ASSIGN : '*=';
DIV_ASSIGN : '/=';
AND_ASSIGN : '&=';
OR_ASSIGN : '|=';
XOR_ASSIGN : '^=';
MOD_ASSIGN : '%=';
LSHIFT_ASSIGN : '<<=';
RSHIFT_ASSIGN : '>>=';
URSHIFT_ASSIGN : '>>>=';
ELVIS_ASSIGN : '?=';
// §3.8 Identifiers (must appear after all keywords in the grammar)
CapitalizedIdentifier
: JavaLetter {Character.isUpperCase(_input.LA(-1))}? JavaLetterOrDigit*
;
Identifier
: JavaLetter JavaLetterOrDigit*
;
fragment
IdentifierInGString
: JavaLetterInGString JavaLetterOrDigitInGString*
;
fragment
JavaLetter
: [a-zA-Z$_] // these are the "java letters" below 0x7F
| // covers all characters above 0x7F which are not a surrogate
~[\u0000-\u007F\uD800-\uDBFF]
{ isJavaIdentifierStartAndNotIdentifierIgnorable(_input.LA(-1)) }?
| // covers UTF-16 surrogate pairs encodings for U+10000 to U+10FFFF
[\uD800-\uDBFF] [\uDC00-\uDFFF]
{ Character.isJavaIdentifierStart(Character.toCodePoint((char) _input.LA(-2), (char) _input.LA(-1))) }?
;
fragment
JavaLetterInGString
: JavaLetter { _input.LA(-1) != '$' }?
;
fragment
JavaLetterOrDigit
: [a-zA-Z0-9$_] // these are the "java letters or digits" below 0x7F
| // covers all characters above 0x7F which are not a surrogate
~[\u0000-\u007F\uD800-\uDBFF]
{ isJavaIdentifierPartAndNotIdentifierIgnorable(_input.LA(-1)) }?
| // covers UTF-16 surrogate pairs encodings for U+10000 to U+10FFFF
[\uD800-\uDBFF] [\uDC00-\uDFFF]
{ Character.isJavaIdentifierPart(Character.toCodePoint((char) _input.LA(-2), (char) _input.LA(-1))) }?
;
fragment
JavaLetterOrDigitInGString
: JavaLetterOrDigit { _input.LA(-1) != '$' }?
;
fragment
ShCommand
: ~[\r\n\uFFFF]*
;
//
// Additional symbols not defined in the lexical specification
//
AT : '@';
ELLIPSIS : '...';
//
// Whitespace, line escape and comments
//
WS : ([ \t]+ | LineEscape+) -> skip
;
// Inside (...) and [...] but not {...}, ignore newlines.
NL : LineTerminator { ignoreTokenInsideParens(); }
;
// Multiple-line comments (including groovydoc comments)
ML_COMMENT
: '/*' .*? '*/' { addComment(0); ignoreMultiLineCommentConditionally(); } -> type(NL)
;
// Single-line comments
SL_COMMENT
: '//' ~[\r\n\uFFFF]* { addComment(1); ignoreTokenInsideParens(); } -> type(NL)
;
// Script-header comments.
// The very first characters of the file may be "#!". If so, ignore the first line.
SH_COMMENT
: '#!' { require(errorIgnored || 0 == this.tokenIndex, "Shebang comment should appear at the first line", -2, true); } ShCommand (LineTerminator '#!' ShCommand)* -> skip
;
// Unexpected characters will be handled by groovy parser later.
UNEXPECTED_CHAR
: . { require(errorIgnored, "Unexpected character: '" + getText().replace("'", "\\'") + "'", -1, false); }
;