зеркало из https://github.com/mozilla/gecko-dev.git
992 строки
26 KiB
Plaintext
992 строки
26 KiB
Plaintext
{
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import java.io.*;
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// Test program
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class TestMain {
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public static void main(String[] args) {
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try {
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JSLexer lexer = new JSLexer(new DataInputStream(System.in));
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JSParser parser = new JSParser(lexer);
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parser.expression(true, true);
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} catch(Exception e) {
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System.err.println("exception: "+e);
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}
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}
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}
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}
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class JSParser extends Parser;
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options {
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// k = 2; // two token lookahead
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tokenVocabulary=JS; // Call its vocabulary "JS"
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codeGenMakeSwitchThreshold = 2; // Some optimizations
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codeGenBitsetTestThreshold = 3;
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// defaultErrorHandler = false; // Don't generate parser error handlers
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// buildAST = true;
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}
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{
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// Possible scopes for parsing
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static final int TopLevelScope = 0;
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static final int ClassScope = 1;
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static final int BlockScope = 2;
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// Possible abbreviation contexts
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/* static final int Abbrev = 0;
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static final int AbbrevNonEmpty = 1;
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static final int AbbrevNoShortIf = 2;
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static final int Full = 3;*/
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}
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// ********* Identifiers **********
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identifier returns [ExpressionNode e]
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{ e = null; }
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: opI:IDENT { e = new JSValue("object", opI.getText()); }
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| "version" { e = new JSValue("object", "version"); }
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| "override" { e = new JSValue("object", "override"); }
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| "method" { e = new JSValue("object", "method"); }
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| "getter" { e = new JSValue("object", "getter"); }
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| "setter" { e = new JSValue("object", "setter"); }
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| "traditional" { e = new JSValue("object", "traditional"); }
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| "constructor" { e = new JSValue("object", "constructor"); }
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;
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qualified_identifier returns [ExpressionNode e]
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{ e = null; ExpressionNode e2 = null; }
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: (e2 = parenthesized_expression)? ("::" e = identifier { e = new BinaryNode("::", e2, e); } )+
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| e = identifier ("::" e2 = identifier { e = new BinaryNode("::", e, e2); } )*
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;
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qualified_identifier_or_parenthesized_expression returns [ExpressionNode e]
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{ e = null; ExpressionNode e2 = null; }
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: (e = parenthesized_expression | e = identifier) ("::" e2 = identifier { e = new BinaryNode("::", e, e2); } )*
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;
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// ********* Primary Expressions **********
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primary_expression[boolean initial] returns [ExpressionNode e]
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{ e = null; }
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: {initial}?
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(
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e = function_expression
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| e = object_literal
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)
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| e = simple_expression
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;
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simple_expression returns [ExpressionNode e]
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{ e = null; }
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: "null" { e = new JSValue("object", "null"); }
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| "true" { e = new JSValue("boolean", "true"); }
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| "false" { e = new JSValue("boolean", "false"); }
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| opN:NUMBER { e = new JSValue("number", opN.getText()); }
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| opS:STRING { e = new JSValue("number", opS.getText()); }
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| "this" { e = new JSValue("object", "this"); }
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| "super" { e = new JSValue("object", "super"); }
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| e = qualified_identifier_or_parenthesized_expression
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| REGEXP
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| e = array_literal
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;
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parenthesized_expression returns [ExpressionNode e]
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{ e = null; }
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: "(" e = expression[false, true] ")" ;
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// ********* Function Expressions **********
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function_expression returns [ExpressionNode e]
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{ e = null; }
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: e = function[false]
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;
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// ********* Object Literals **********
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object_literal returns [ExpressionNode e]
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{ e = null; }
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: "{" (field_list)? "}" ;
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field_list returns [ExpressionNode e]
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{ e = null; }
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: literal_field ("," literal_field)* ;
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literal_field returns [ExpressionNode e]
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{ e = null; }
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: qualified_identifier ":" assignment_expression[false, true]
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;
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// ********* Array Literals **********
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array_literal returns [ExpressionNode e]
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{ e = null; }
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: "[" (element_list)? "]" ;
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element_list
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: literal_element ("," literal_element)* ;
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literal_element
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: assignment_expression[false, true] ;
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// ********* Postfix Unary Operators **********
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postfix_expression[boolean initial] returns [ExpressionNode e]
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{ e = null; ExpressionNode r = null; }
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:
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( e = primary_expression[initial]
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| e = new_expression
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)
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(
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r = member_operator { e = new BinaryNode(((UnaryNode)r).getOperator(), e, ((UnaryNode)r).getChild()); }
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| r = arguments { e = new BinaryNode("()", e, r); }
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| "++" { e = new UnaryNode("++", e); }
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| "--" { e = new UnaryNode("--", e); }
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)*
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;
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new_expression returns [ExpressionNode e]
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{ e = null; }
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: "new"
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(
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new_expression
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| (
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primary_expression[false]
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(
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// There's an ambiguity here:
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// Consider the input 'new f.x'. Is that equivalent to '(new f).x' or 'new (f.x)' ?
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// Assume the latter by using ANTLR's default behavior of consuming input as
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// soon as possible and quell the resultant warning.
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options {
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warnWhenFollowAmbig=false;
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}
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: member_operator
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)*
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)
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)
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(
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// There's an ambiguity here:
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// Consider the input 'new F(arg)'. Is that equivalent to '(new F)(arg)' or does
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// it construct an instance of F, passing 'arg' as an argument to the constructor ?
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// Assume the latter by using ANTLR's default behavior of consuming input as
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// soon as possible and quell the resultant warning.
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options {
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warnWhenFollowAmbig=false;
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}
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: arguments
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)*
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;
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member_operator returns [ExpressionNode e]
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{ e = null; }
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: "[" e = argument_list "]" { e = new UnaryNode("[]", e); }
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| DOT e = qualified_identifier_or_parenthesized_expression { e = new UnaryNode(".", e); }
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| "@" e = qualified_identifier_or_parenthesized_expression { e = new UnaryNode("@", e); }
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;
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arguments returns [ExpressionNode e]
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{ e = null; }
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: "(" argument_list ")" ;
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argument_list returns [ExpressionNode e]
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{ e = null; }
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: (assignment_expression[false, true] ("," assignment_expression[false, true])*)? ;
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// ********* Prefix Unary Operators **********
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unary_expression[boolean initial] returns [ExpressionNode e]
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{ e = null; }
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: e = postfix_expression[initial]
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| "delete" e = postfix_expression[false] { e = new UnaryNode("delete", e); }
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| "typeof" e = unary_expression[false] { e = new UnaryNode("typeof", e); }
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| "eval" e = unary_expression[false] { e = new UnaryNode("eval", e); }
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| "++" e = postfix_expression[false] { e = new UnaryNode("++", e); }
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| "--" e = postfix_expression[false] { e = new UnaryNode("--", e); }
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| "+" e = unary_expression[false] { e = new UnaryNode("+", e); }
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| "-" e = unary_expression[false] { e = new UnaryNode("-", e); }
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| "~" e = unary_expression[false] { e = new UnaryNode("~", e); }
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| "!" e = unary_expression[false] { e = new UnaryNode("!", e); }
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;
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// ********* Multiplicative Operators **********
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multiplicative_expression[boolean initial] returns [ExpressionNode e]
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{ e = null; ExpressionNode r = null; }
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: e = unary_expression[initial] (
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("*" r = unary_expression[false] { e = new ArithmeticNode("*", e, r); } )
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| ("/" r = unary_expression[false] { e = new ArithmeticNode("/", e, r); } )
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| ("%" r = unary_expression[false] { e = new ArithmeticNode("%", e, r); } )
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)*
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;
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// ********* Additive Operators **********
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additive_expression[boolean initial] returns [ExpressionNode e]
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{ e = null; ExpressionNode r = null; }
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: e = multiplicative_expression[initial] (
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("+" r = multiplicative_expression[false] { e = new ArithmeticNode("+", e, r); } )
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| ("-" r = multiplicative_expression[false] { e = new ArithmeticNode("-", e, r); } )
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)*
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;
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// ********* Bitwise Shift Operators **********
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shift_expression[boolean initial] returns [ExpressionNode e]
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{ e = null; ExpressionNode r = null; }
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: e = additive_expression[initial] (
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("<<" r = additive_expression[false] { e = new ArithmeticNode("<<", e, r); } )
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| (">>" r = additive_expression[false] { e = new ArithmeticNode(">>", e, r); } )
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| (">>>" r = additive_expression[false] { e = new ArithmeticNode(">>>", e, r); } )
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)*
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;
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// ********* Relational Operators **********
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relational_operator[boolean allowIn] returns [String s]
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{ s = null; }
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: {allowIn}? "in" { s = "in"; }
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| "<" { s = "<"; }
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| ">" { s = ">"; }
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| "<=" { s = "<="; }
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| ">=" { s = ">="; }
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| "instanceof" { s = "instanceof"; }
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;
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relational_expression[boolean initial, boolean allowIn] returns [ExpressionNode e]
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{ e = null; ExpressionNode r = null; String op = null; }
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: e = shift_expression[initial]
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(
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// ANTLR reports an ambiguity here because the FOLLOW set of a relational_expression
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// includes the "in" token (from the for-in statement), but there's no real ambiguity
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// here because the 'allowIn' semantic predicate is used to prevent the two from being
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// confused.
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options { warnWhenFollowAmbig=false; }:
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op = relational_operator[allowIn] r = shift_expression[false] { e = new RelationalNode(op, e, r); }
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)*
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;
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// ********* Equality Operators **********
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equality_expression[boolean initial, boolean allowIn] returns [ExpressionNode e]
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{ e = null; ExpressionNode r = null; }
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: e = relational_expression[initial, allowIn]
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(
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("==" r = relational_expression[false, allowIn]) { e = new RelationalNode("==", e, r); }
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| ("!=" r = relational_expression[false, allowIn]) { e = new RelationalNode("!=", e, r); }
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| ("===" r = relational_expression[false, allowIn]) { e = new RelationalNode("===", e, r); }
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| ("!==" r = relational_expression[false, allowIn]) { e = new RelationalNode("!===", e, r); }
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)*
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;
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// ********* Binary Bitwise Operators **********
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bitwise_and_expression[boolean initial, boolean allowIn] returns [ExpressionNode e]
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{ e = null; ExpressionNode r = null; }
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: e = equality_expression[initial, allowIn]
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("&" r = equality_expression[false, allowIn] { e = new ArithmeticNode("&", e, r); } )*
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;
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bitwise_xor_expression[boolean initial, boolean allowIn] returns [ExpressionNode e]
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{ e = null; ExpressionNode r = null; }
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: e = bitwise_and_expression[initial, allowIn]
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("^" (r = bitwise_and_expression[false, allowIn] { e = new BinaryNode("^", e, r); } | "*" | "?"))*
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;
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bitwise_or_expression[boolean initial, boolean allowIn] returns [ExpressionNode e]
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{ e = null; ExpressionNode r = null; }
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: e = bitwise_xor_expression[initial, allowIn]
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("|" (r = bitwise_xor_expression[false, allowIn] { e = new BinaryNode("|", e, r); } | "*" | "?"))*
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;
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// ********* Binary Logical Operators **********
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logical_and_expression[boolean initial, boolean allowIn] returns [ExpressionNode e]
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{ e = null; ExpressionNode r = null; }
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: e = bitwise_or_expression[initial, allowIn]
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("&&" r = bitwise_or_expression[false, allowIn] { e = new BinaryNode("&&", e, r); } )*
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;
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logical_or_expression[boolean initial, boolean allowIn] returns [ExpressionNode e]
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{ e = null; ExpressionNode r = null; }
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: e = logical_and_expression[initial, allowIn]
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("||" r = logical_and_expression[false, allowIn] { e = new BinaryNode("||", e, r); } )*
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;
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// ********* Conditional Operators **********
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conditional_expression[boolean initial, boolean allowIn] returns [ExpressionNode e]
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{ e = null; }
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: e = logical_or_expression[initial, allowIn]
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// There's an ambiguity here:
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// Consider the input 'a ? b : c ? d : e'. Is that equivalent to '(a ? b : c) ? d : e' or
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// should it be interpreted as 'a ? b : (c ? d : e)' ?
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// Assume the latter by using ANTLR's default behavior of consuming input as
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// soon as possible and quell the resultant warning.
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(
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options {warnWhenFollowAmbig=false;}
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: "?" assignment_expression[false, allowIn] ":" assignment_expression[false, allowIn]
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)*
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;
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non_assignment_expression[boolean initial, boolean allowIn] returns [ExpressionNode e]
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{ e = null; }
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: e = logical_or_expression[initial, allowIn]
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// There's an ambiguity here:
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// Consider the input 'a ? b : c ? d : e'. Is that equivalent to '(a ? b : c) ? d : e' or
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// should it be interpreted as 'a ? b : (c ? d : e)' ?
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// Assume the latter by using ANTLR's default behavior of consuming input as
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// soon as possible and quell the resultant warning.
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(
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options {
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warnWhenFollowAmbig=false;
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}
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: "?" non_assignment_expression[false, allowIn] ":" non_assignment_expression[false, allowIn]
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)*
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;
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// ********* Assignment Operators **********
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// FIXME - Can we get rid of lookahead ?
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assignment_expression[boolean initial, boolean allowIn] returns [ExpressionNode e]
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{ e = null; ExpressionNode p = null; ExpressionNode a = null; String op = null; }
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: (postfix_expression[initial] "=") =>
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(p = postfix_expression[initial] "=" a = assignment_expression[false, allowIn] { e = new AssignmentNode("=", p, a); } )
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| (postfix_expression[initial] compound_assignment) =>
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(p = postfix_expression[initial] op = compound_assignment a = assignment_expression[false, allowIn] { e = new AssignmentNode(op, p, a); } )
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| e = conditional_expression[false, allowIn]
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;
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compound_assignment returns [String op]
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{ op = null; }
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: "*=" { op = "*="; }
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| "/=" { op = "/="; }
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| "%=" { op = "%="; }
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| "+=" { op = "+="; }
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| "-=" { op = "-="; }
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| "<<=" { op = "<<="; }
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| ">>=" { op = ">>="; }
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| ">>>=" { op = ">>>="; }
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| "&=" { op = "&="; }
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| "^=" { op = "^="; }
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| "|=" { op = "|="; }
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;
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// ********* Expressions **********
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expression[boolean initial, boolean allowIn] returns [ExpressionNode e]
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{ e = null; ExpressionNode e2 = null; }
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: e = assignment_expression[initial, allowIn] ("," e2 = assignment_expression[false, allowIn] { e = new BinaryNode(",", e, e2); } )*
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;
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optional_expression
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: (expression[false, true])?
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;
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// ********* Type Expressions **********
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type_expression[boolean initial, boolean allowIn]
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: non_assignment_expression[initial, allowIn]
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;
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// ********* Statements **********
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statement[int scope, boolean non_empty, ControlNodeGroup prev] returns [ControlNodeGroup c]
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{ c = null; }
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: c = code_statement[non_empty, prev]
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| definition[scope]
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;
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code_statement[boolean non_empty, ControlNodeGroup prev] returns [ControlNodeGroup c]
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{ c = null; }
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: empty_statement[non_empty]
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| (identifier ":") => labeled_statement[non_empty, prev]
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| c = expression_statement[prev] semicolon
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| block[BlockScope]
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| c = if_statement[non_empty, prev]
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| switch_statement
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| do_statement semicolon
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| c = while_statement[non_empty, prev]
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| for_statement[non_empty]
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| with_statement[non_empty]
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| continue_statement semicolon
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| break_statement semicolon
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| return_statement semicolon
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| throw_statement semicolon
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| try_statement
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| import_statement[non_empty]
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;
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semicolon
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// FIXME - Add abbreviation
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: ";"
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;
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// ********* Empty Statement **********
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// FIXME
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empty_statement[boolean non_empty]returns [ControlNode c]
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{ c = null; }
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: ";"
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;
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// ********* Expression Statement **********
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expression_statement[ControlNodeGroup prev] returns [ControlNodeGroup c]
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{ c = null; ControlNode t = null; ExpressionNode e = null; }
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: e = expression[true, true]
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{
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t = new ControlNode(e);
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if (prev == null) {
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c = new ControlNodeGroup(t);
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c.addTail(t);
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}
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else {
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prev.fixTails(t);
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prev.addTail(t);
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c = prev;
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}
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}
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;
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// ********* Block **********
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block[int scope] returns [ControlNodeGroup c]
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{ c = null; }
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: "{" c = statements[scope] "}"
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;
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// FIXME
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statements[int scope] returns [ControlNodeGroup c]
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{ c = null; ControlNodeGroup c2 = null; }
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: c = statement[scope, false, null]
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( c = statement[scope, false, c] )*
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;
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// ********* Labeled Statements **********
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labeled_statement[boolean non_empty, ControlNodeGroup prev]
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: identifier ":" code_statement[non_empty, prev]
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;
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if_statement[boolean non_empty, ControlNodeGroup prev] returns [ControlNodeGroup c]
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{ c = null; ControlNodeGroup c2 = null; ConditionalNode t = null; ExpressionNode e = null; }
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: "if" e = parenthesized_expression c = code_statement[non_empty, null]
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{
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t = new ConditionalNode(e, c.getHead());
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if (prev != null) {
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prev.fixTails(t);
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c.setHead(prev.getHead());
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}
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else
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c.setHead(t);
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c.addTail(t);
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}
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(
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// Standard if/else ambiguity
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options { warnWhenFollowAmbig=false; }:
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"else" c2 = code_statement[non_empty, null]
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{
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t.setNext(c2.getHead());
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|
c.removeTail(t);
|
|
c.addTails(c2);
|
|
}
|
|
)?
|
|
;
|
|
|
|
// ********* Switch statement **********
|
|
switch_statement
|
|
: "switch" parenthesized_expression "{" (case_groups)? "}"
|
|
;
|
|
|
|
case_groups
|
|
: (case_group)+
|
|
;
|
|
|
|
case_group
|
|
: (case_guard)+ (code_statement[true, null])+
|
|
;
|
|
|
|
case_guard
|
|
: "case" expression[false, true] ":"
|
|
| "default" ":"
|
|
;
|
|
|
|
// FIXME
|
|
case_statements
|
|
: (code_statement[false, null])+
|
|
;
|
|
|
|
// ********* Do-While statement **********
|
|
do_statement
|
|
: "do" code_statement[true, null] "while" parenthesized_expression
|
|
;
|
|
|
|
// ********* While statement **********
|
|
while_statement[boolean non_empty, ControlNodeGroup prev] returns [ControlNodeGroup c]
|
|
{ c = null; }
|
|
: "while" parenthesized_expression code_statement[non_empty, null]
|
|
;
|
|
|
|
// ********* For statement **********
|
|
for_statement[boolean non_empty]
|
|
: "for" "("
|
|
(
|
|
(for_initializer ";") => for_initializer ";" optional_expression ";" optional_expression
|
|
| for_in_binding "in" expression[false, true]
|
|
)
|
|
")"
|
|
code_statement[non_empty, null]
|
|
;
|
|
|
|
for_initializer
|
|
: (
|
|
expression[false, true]
|
|
| ("var" | "const") variable_binding_list[false]
|
|
)?
|
|
;
|
|
|
|
for_in_binding
|
|
: (
|
|
postfix_expression[false]
|
|
| ("var" | "const") variable_binding_list[false]
|
|
)
|
|
;
|
|
|
|
// ********* With statement **********
|
|
with_statement[boolean non_empty]
|
|
: "with" parenthesized_expression code_statement[non_empty, null]
|
|
;
|
|
|
|
// ********* Continue and Break statement **********
|
|
continue_statement
|
|
: "continue" (identifier)?
|
|
;
|
|
|
|
break_statement
|
|
: "break" (identifier)?
|
|
;
|
|
|
|
// ********* Return statement **********
|
|
return_statement
|
|
: "return" optional_expression
|
|
;
|
|
|
|
// ********* Throw statement **********
|
|
throw_statement
|
|
: "throw" expression[false, true]
|
|
;
|
|
|
|
// ********* Try statement **********
|
|
try_statement
|
|
: "try" block[BlockScope] (catch_clause)* ("finally" block[BlockScope])?
|
|
;
|
|
|
|
catch_clause
|
|
: "catch" "(" typed_identifier[true] ")" block[BlockScope]
|
|
;
|
|
|
|
// ********* Import statement **********
|
|
import_statement[boolean non_empty]
|
|
: "import" import_list
|
|
(
|
|
";"
|
|
| block[BlockScope] ("else" code_statement[non_empty, null])
|
|
)
|
|
;
|
|
|
|
import_list
|
|
: import_item ("," import_item)*
|
|
;
|
|
|
|
import_item
|
|
: (identifier "=") => identifier "=" import_source
|
|
| import_source
|
|
| "protected" identifier "=" import_source
|
|
;
|
|
|
|
import_source
|
|
: non_assignment_expression[false, false] (":" Version)
|
|
;
|
|
|
|
// ********* Definitions **********
|
|
definition[int scope]
|
|
: visibility global_definition
|
|
| local_definition[scope]
|
|
;
|
|
|
|
global_definition
|
|
: version_definition semicolon
|
|
| variable_definition semicolon
|
|
| function_definition
|
|
| member_definition
|
|
| class_definition
|
|
;
|
|
|
|
local_definition[int scope]
|
|
: {scope == TopLevelScope || scope == ClassScope}? (class_definition | member_definition)
|
|
| variable_definition semicolon
|
|
| function_definition
|
|
;
|
|
|
|
// ********* Visibility Specifications **********
|
|
visibility
|
|
: "private"
|
|
| "package"
|
|
| "public" versions_and_renames
|
|
;
|
|
|
|
// ********* Versions **********
|
|
|
|
// FIXME
|
|
versions_and_renames:
|
|
version_range_and_alias ("," version_range_and_alias)*
|
|
;
|
|
|
|
version_range_and_alias
|
|
: version_range (":" identifier)
|
|
;
|
|
|
|
version_range
|
|
: (version)? (".." (version)?)
|
|
;
|
|
|
|
version: STRING ;
|
|
|
|
// ********* Version Definition **********
|
|
version_definition
|
|
: "version" version
|
|
(
|
|
">" version_list
|
|
"=" version
|
|
)?
|
|
;
|
|
|
|
version_list
|
|
: version ("," version)*
|
|
;
|
|
|
|
// ********* Variable Definition **********
|
|
variable_definition
|
|
: ("var" | "const") variable_binding_list[true]
|
|
;
|
|
|
|
variable_binding_list[boolean allowIn]
|
|
: variable_binding[allowIn] ("," variable_binding[allowIn])*
|
|
;
|
|
|
|
variable_binding[boolean allowIn]
|
|
: typed_identifier[allowIn] ("=" assignment_expression[false, allowIn])?
|
|
;
|
|
|
|
typed_identifier[boolean allowIn]
|
|
: (type_expression[false, allowIn] identifier) => type_expression[false, allowIn] identifier
|
|
| identifier
|
|
;
|
|
|
|
// ********* Function Definition **********
|
|
function_definition
|
|
: named_function
|
|
| "getter" named_function
|
|
| "setter" named_function
|
|
| traditional_function
|
|
;
|
|
|
|
anonymous_function
|
|
: function[false]
|
|
;
|
|
|
|
named_function
|
|
: function[true]
|
|
;
|
|
|
|
function[boolean nameRequired] returns [ExpressionNode e]
|
|
{ e = null; }
|
|
: "function"
|
|
(
|
|
{nameRequired}? identifier
|
|
| identifier
|
|
)
|
|
function_signature block[BlockScope]
|
|
;
|
|
|
|
function_signature
|
|
: parameter_signature result_signature
|
|
;
|
|
|
|
parameter_signature
|
|
: "(" parameters ")"
|
|
;
|
|
|
|
parameters
|
|
: (parameter ("," parameter)*)? (rest_parameter)?
|
|
;
|
|
|
|
// FIXME - Required parameters cannot follow optional parameters
|
|
parameter
|
|
: typed_identifier[true] ("=" (assignment_expression[false, true])? )?
|
|
;
|
|
|
|
rest_parameter
|
|
: "..." (identifier)?
|
|
;
|
|
|
|
|
|
result_signature
|
|
: (
|
|
// ANTLR reports an ambiguity here because the FOLLOW set of a parameter_signature
|
|
// includes the "{" token (from the block that contains a function's code), but there's
|
|
// no real ambiguity here because the 'allowIn' semantic predicate is used to prevent the
|
|
// two from being confused.
|
|
options { warnWhenFollowAmbig=false; }:
|
|
type_expression[true, true]
|
|
)?
|
|
;
|
|
|
|
traditional_function
|
|
: "traditional" "function" identifier "(" traditional_parameter_list ")" block[BlockScope]
|
|
;
|
|
|
|
traditional_parameter_list
|
|
: (identifier ("," identifier)* )?
|
|
;
|
|
|
|
// ********* Class Member Definitions **********
|
|
member_definition
|
|
: field_definition semicolon
|
|
| method_definition
|
|
| constructor_definition
|
|
;
|
|
|
|
field_definition
|
|
: "field" variable_binding_list[true]
|
|
;
|
|
|
|
method_definition
|
|
: method_prefix identifier function_signature (block[BlockScope] | semicolon)
|
|
;
|
|
|
|
method_prefix
|
|
: ("final")? ("override")? ("getter" | "setter")? "method"
|
|
;
|
|
|
|
constructor_definition
|
|
: "constructor" ("new" | identifier) parameter_signature block[BlockScope]
|
|
;
|
|
|
|
// ********* Class Definition **********
|
|
class_definition
|
|
: "class"
|
|
(
|
|
"extends" type_expression[true, true]
|
|
| identifier ("extends" type_expression[true, true])?
|
|
)
|
|
block[ClassScope]
|
|
;
|
|
|
|
// ********* Programs **********
|
|
// Start symbol for JS programs
|
|
program
|
|
: statements[TopLevelScope]
|
|
;
|
|
|
|
// ************************************************************************************************
|
|
class JSLexer extends Lexer;
|
|
|
|
// Lexer options
|
|
options {
|
|
tokenVocabulary=JS; // Name the token vocabulary
|
|
testLiterals=false; // Don't automatically test every token to see if it's a literal.
|
|
// Rather, test only the ones that we explicitly indicate.
|
|
k=4; // Set number of lookahead characters
|
|
}
|
|
|
|
// Operators
|
|
OPERATORS
|
|
options {testLiterals=true;}
|
|
: '?'
|
|
| '('
|
|
| ')'
|
|
| '['
|
|
| ']'
|
|
| '{'
|
|
| '}'
|
|
| ':'
|
|
| ','
|
|
// | '.' FIXME - conflict w/ NUMBER
|
|
| '='
|
|
| "=="
|
|
| '!'
|
|
| '~'
|
|
| "!="
|
|
// | '/' FIXME - conflict w/ REGEXP
|
|
// | "/="
|
|
| '+'
|
|
| "+="
|
|
| "++"
|
|
| '-'
|
|
| "-="
|
|
| "--"
|
|
| '*'
|
|
| "*="
|
|
| '%'
|
|
| "%="
|
|
| ">>"
|
|
| ">>="
|
|
| ">>>"
|
|
| ">>>="
|
|
| ">="
|
|
| ">"
|
|
| "<<"
|
|
| "<<="
|
|
| "<="
|
|
| '<'
|
|
| '^'
|
|
| "^="
|
|
| '|'
|
|
| "|="
|
|
| "||"
|
|
| '&'
|
|
| "&="
|
|
| "&&"
|
|
| ";"
|
|
// | "..."
|
|
;
|
|
|
|
// Whitespace - mostly ignored
|
|
WHITESPACE:
|
|
( '\t' // Tab
|
|
| '\u000B' // Vertical Tab
|
|
| '\u000C' // Form Feed
|
|
| ' ' // Space
|
|
| LINE_TERMINATOR // subrule for newlines
|
|
)
|
|
{ $setType(Token.SKIP); }
|
|
;
|
|
|
|
// Line Terminator
|
|
protected
|
|
LINE_TERMINATOR:
|
|
( "\r\n" // Evil DOS
|
|
| '\r' // Macintosh
|
|
| '\n' // Unix (the right way)
|
|
)
|
|
{ newline(); }
|
|
;
|
|
|
|
// Single-line comments
|
|
SINGLE_LINE_COMMENT
|
|
: "//"
|
|
(~('\n'|'\r'))*
|
|
{$setType(Token.SKIP);}
|
|
;
|
|
|
|
// Multiple-line comments
|
|
MULTI_LINE_COMMENT
|
|
: "/*"
|
|
( /* '\r' '\n' can be matched in one alternative or by matching
|
|
'\r' in one iteration and '\n' in another. I am trying to
|
|
handle any flavor of newline that comes in, but the language
|
|
that allows both "\r\n" and "\r" and "\n" to all be valid
|
|
newline is ambiguous. Consequently, the resulting grammar
|
|
must be ambiguous. I'm shutting this warning off.
|
|
*/
|
|
options {
|
|
generateAmbigWarnings=false;
|
|
}
|
|
:
|
|
{ LA(2)!='/' }? '*'
|
|
| '\r' '\n' {newline();}
|
|
| '\r' {newline();}
|
|
| '\n' {newline();}
|
|
| ~('*'|'\n'|'\r')
|
|
)*
|
|
"*/"
|
|
{$setType(Token.SKIP);}
|
|
;
|
|
|
|
// string literals
|
|
STRING
|
|
: '"' (ESC|~('"'|'\\'))* '"' // Double-quoted string
|
|
| '\'' (ESC|~('\''|'\\'))* '\'' // Single-quoted string
|
|
;
|
|
|
|
// escape sequence -- note that this is protected; it can only be called
|
|
// from another lexer rule -- it will not ever directly return a token to
|
|
// the parser
|
|
// There are various ambiguities hushed in this rule. The optional
|
|
// '0'...'9' digit matches should be matched here rather than letting
|
|
// them go back to STRING_LITERAL to be matched. ANTLR does the
|
|
// right thing by matching immediately; hence, it's ok to shut off
|
|
// the FOLLOW ambig warnings.
|
|
protected
|
|
ESC
|
|
: '\\'
|
|
( 'b'
|
|
| 't'
|
|
| 'n'
|
|
| 'f'
|
|
| 'r'
|
|
| '"'
|
|
| '\''
|
|
| '\\'
|
|
| 'u' HEX_DIGIT HEX_DIGIT HEX_DIGIT HEX_DIGIT
|
|
| ('0'..'3')
|
|
(
|
|
options {
|
|
warnWhenFollowAmbig = false;
|
|
}
|
|
: ('0'..'7')
|
|
(
|
|
options {
|
|
warnWhenFollowAmbig = false;
|
|
}
|
|
: '0'..'7'
|
|
)?
|
|
)?
|
|
| ('4'..'7')
|
|
(
|
|
options {
|
|
warnWhenFollowAmbig = false;
|
|
}
|
|
: ('0'..'7')
|
|
)?
|
|
)
|
|
;
|
|
|
|
|
|
// hexadecimal digit (again, note it's protected!)
|
|
protected
|
|
HEX_DIGIT
|
|
: ('0'..'9'|'A'..'F'|'a'..'f')
|
|
;
|
|
|
|
// a numeric literal
|
|
NUMBER
|
|
{boolean isDecimal=false;}
|
|
: '.' {$setType(DOT);} (('0'..'9')+ (EXPONENT)? { $setType(NUMBER); })?
|
|
| ( '0' {isDecimal = true;} // special case for just '0'
|
|
( ('x'|'X')
|
|
( // hex
|
|
// the 'e'|'E' and float suffix stuff look
|
|
// like hex digits, hence the (...)+ doesn't
|
|
// know when to stop: ambig. ANTLR resolves
|
|
// it correctly by matching immediately. It
|
|
// is therefor ok to hush warning.
|
|
options {
|
|
warnWhenFollowAmbig=false;
|
|
}
|
|
: HEX_DIGIT
|
|
)+
|
|
| ('0'..'7')+ // octal
|
|
)?
|
|
| ('1'..'9') ('0'..'9')* {isDecimal=true;} // non-zero decimal
|
|
)
|
|
|
|
// only check to see if it's a float if looks like decimal so far
|
|
( {isDecimal}?
|
|
( '.' ('0'..'9')* (EXPONENT)?
|
|
| EXPONENT
|
|
)?
|
|
| // Empty
|
|
)
|
|
;
|
|
|
|
|
|
// A protected methods to assist in matching floating point numbers
|
|
protected
|
|
EXPONENT
|
|
: ('e'|'E') ('+'|'-')? ('0'..'9')+
|
|
;
|
|
|
|
// An identifier. Note that testLiterals is set to true, so that
|
|
// after the rule is matched, the literals table is queried to see
|
|
// if the token is a literal or if it's really an identifer.
|
|
IDENT
|
|
options {testLiterals=true;}
|
|
: ('a'..'z'|'A'..'Z'|'_'|'$') ('a'..'z'|'A'..'Z'|'_'|'0'..'9'|'$')*
|
|
;
|
|
|
|
// FIXME - this is a placeholder until lexical disambiguation is added between
|
|
// division and regexps.
|
|
REGEXP
|
|
: '/' (~('/'|'*'))+ '/'
|
|
;
|