| /* |
| [The "BSD license"] |
| Copyright (c) 2010 Terence Parr |
| All rights reserved. |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions |
| are met: |
| 1. Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| 2. Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| 3. The name of the author may not be used to endorse or promote products |
| derived from this software without specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| asTypeInitMap ::= [ |
| "int":"0", |
| "uint":"0", |
| "Number":"0.0", |
| "Boolean":"false", |
| default:"null" // anything other than an atomic type |
| ] |
| |
| /** The overall file structure of a recognizer; stores methods for rules |
| * and cyclic DFAs plus support code. |
| */ |
| outputFile(LEXER,PARSER,TREE_PARSER, actionScope, actions, |
| docComment, recognizer, |
| name, tokens, tokenNames, rules, cyclicDFAs, |
| bitsets, buildTemplate, buildAST, rewriteMode, profile, |
| backtracking, synpreds, memoize, numRules, |
| fileName, ANTLRVersion, generatedTimestamp, trace, |
| scopes, superClass, literals) ::= |
| << |
| // $ANTLR <ANTLRVersion> <fileName> <generatedTimestamp> |
| package<if(actions.(actionScope).package)> <actions.(actionScope).package><endif> { |
| <actions.(actionScope).header> |
| <@imports> |
| import org.antlr.runtime.*; |
| <if(TREE_PARSER)> |
| import org.antlr.runtime.tree.*; |
| <endif> |
| <@end> |
| |
| <docComment> |
| <recognizer> |
| } |
| >> |
| |
| lexer(grammar, name, tokens, scopes, rules, numRules, filterMode, labelType="Token", |
| superClass="Lexer") ::= << |
| public class <grammar.recognizerName> extends <if(actions.(actionScope).superClass)><actions.(actionScope).superClass><else><@superClassName><superClass><@end><endif> { |
| <tokens:{it |public static const <it.name>:int=<it.type>;}; separator="\n"> |
| <scopes:{it |<if(it.isDynamicGlobalScope)><globalAttributeScope(it)><endif>}> |
| <actions.lexer.members> |
| |
| // delegates |
| <grammar.delegates: |
| {g|public var <g:delegateName()>:<g.recognizerName>;}; separator="\n"> |
| // delegators |
| <grammar.delegators: |
| {g|public var <g:delegateName()>:<g.recognizerName>;}; separator="\n"> |
| <last(grammar.delegators):{g|public var gParent:<g.recognizerName>;}> |
| |
| public function <grammar.recognizerName>(<grammar.delegators:{g|<g:delegateName()>:<g.recognizerName>, }>input:CharStream = null, state:RecognizerSharedState = null) { |
| super(input, state); |
| <cyclicDFAs:cyclicDFACtor()> |
| <if(memoize)> |
| <if(grammar.grammarIsRoot)> |
| this.state.ruleMemo = new Array(<numRules>+1);<\n> <! index from 1..n !> |
| <endif> |
| <endif> |
| <grammar.directDelegates: |
| {g|<g:delegateName()> = new <g.recognizerName>(<trunc(g.delegators):{p|<p:delegateName()>, }>this, input, this.state);}; separator="\n"> |
| <grammar.delegators: |
| {g|this.<g:delegateName()> = <g:delegateName()>;}; separator="\n"> |
| <last(grammar.delegators):{g|gParent = <g:delegateName()>;}> |
| } |
| public override function get grammarFileName():String { return "<fileName>"; } |
| |
| <if(filterMode)> |
| <filteringNextToken()> |
| <endif> |
| <rules; separator="\n\n"> |
| |
| <synpreds:{p | <lexerSynpred(p)>}> |
| |
| <cyclicDFAs:cyclicDFA()> <! dump tables for all DFA !> |
| |
| } |
| >> |
| |
| /** A override of Lexer.nextToken() that backtracks over mTokens() looking |
| * for matches. No error can be generated upon error; just rewind, consume |
| * a token and then try again. backtracking needs to be set as well. |
| * Make rule memoization happen only at levels above 1 as we start mTokens |
| * at backtracking==1. |
| */ |
| filteringNextToken() ::= << |
| public override function nextToken():Token { |
| while (true) { |
| if ( input.LA(1)==CharStreamConstants.EOF ) { |
| return TokenConstants.EOF_TOKEN; |
| } |
| this.state.token = null; |
| this.state.channel = TokenConstants.DEFAULT_CHANNEL; |
| this.state.tokenStartCharIndex = input.index; |
| this.state.tokenStartCharPositionInLine = input.charPositionInLine; |
| this.state.tokenStartLine = input.line; |
| this.state.text = null; |
| try { |
| var m:int = input.mark(); |
| this.state.backtracking=1; <! means we won't throw slow exception !> |
| this.state.failed=false; |
| mTokens(); |
| this.state.backtracking=0; |
| <! mTokens backtracks with synpred at backtracking==2 |
| and we set the synpredgate to allow actions at level 1. !> |
| if ( this.state.failed ) { |
| input.rewindTo(m); |
| input.consume(); <! advance one char and try again !> |
| } |
| else { |
| emit(); |
| return this.state.token; |
| } |
| } |
| catch (re:RecognitionException) { |
| // shouldn't happen in backtracking mode, but... |
| reportError(re); |
| recover(re); |
| } |
| } |
| // Not reached - For ActionScript compiler |
| throw new Error(); |
| } |
| |
| public override function memoize(input:IntStream, |
| ruleIndex:int, |
| ruleStartIndex:int):void |
| { |
| if ( this.state.backtracking>1 ) super.memoize(input, ruleIndex, ruleStartIndex); |
| } |
| |
| public override function alreadyParsedRule(input:IntStream, ruleIndex:int):Boolean { |
| if ( this.state.backtracking>1 ) return super.alreadyParsedRule(input, ruleIndex); |
| return false; |
| } |
| >> |
| |
| actionGate() ::= "this.state.backtracking==0" |
| |
| filteringActionGate() ::= "this.state.backtracking==1" |
| |
| /** How to generate a parser */ |
| genericParser(grammar, name, scopes, tokens, tokenNames, rules, numRules, |
| bitsets, inputStreamType, superClass, |
| labelType, members, rewriteElementType, |
| filterMode, ASTLabelType="Object") ::= << |
| public class <grammar.recognizerName> extends <if(actions.(actionScope).superClass)><actions.(actionScope).superClass><else><@superClassName><superClass><@end><endif> { |
| <if(grammar.grammarIsRoot)> |
| public static const tokenNames:Array = [ |
| "\<invalid>", "\<EOR>", "\<DOWN>", "\<UP>", <tokenNames; separator=", "> |
| ];<\n> |
| <endif> |
| <tokens:{it |public static const <it.name>:int=<it.type>;}; separator="\n"> |
| |
| // delegates |
| <grammar.delegates: {g|public var <g:delegateName()>:<g.recognizerName>;}; separator="\n"> |
| // delegators |
| <grammar.delegators: |
| {g|public var <g:delegateName()>:<g.recognizerName>;}; separator="\n"> |
| <last(grammar.delegators):{g|public var gParent:<g.recognizerName>;}> |
| |
| <scopes:{it |<if(it.isDynamicGlobalScope)><globalAttributeScope(it)><endif>}> |
| <@members> |
| <! WARNING. bug in ST: this is cut-n-paste into Dbg.stg !> |
| public function <grammar.recognizerName>(<grammar.delegators:{g|<g:delegateName()>:<g.recognizerName>, }>input:<inputStreamType>, state:RecognizerSharedState = null) { |
| super(input, state); |
| <cyclicDFAs:cyclicDFACtor()> |
| <parserCtorBody()> |
| <grammar.directDelegates: |
| {g|<g:delegateName()> = new <g.recognizerName>(<trunc(g.delegators):{p|<p:delegateName()>, }>this, input, this.state);}; separator="\n"> |
| <grammar.indirectDelegates:{g | <g:delegateName()> = <g.delegator:delegateName()>.<g:delegateName()>;}; separator="\n"> |
| <last(grammar.delegators):{g|gParent = <g:delegateName()>;}> |
| } |
| <@end> |
| |
| public override function get tokenNames():Array { return <grammar.composite.rootGrammar.recognizerName>.tokenNames; } |
| public override function get grammarFileName():String { return "<fileName>"; } |
| |
| <members> |
| |
| <rules; separator="\n\n"> |
| |
| <! generate rule/method definitions for imported rules so they |
| appear to be defined in this recognizer. !> |
| // Delegated rules |
| <grammar.delegatedRules:{ruleDescriptor| |
| public function <ruleDescriptor.name>(<ruleDescriptor.parameterScope:parameterScope()>):<returnType()> { <if(ruleDescriptor.hasReturnValue)>return <endif><ruleDescriptor.grammar:delegateName()>.<ruleDescriptor.name>(<ruleDescriptor.parameterScope.attributes:{a|<a.name>}; separator=", ">); \}}; separator="\n"> |
| |
| <synpreds:{p | <synpred(p)>}> |
| |
| <cyclicDFAs:cyclicDFA()> <! dump tables for all DFA !> |
| |
| <bitsets:{it | <bitset(name={FOLLOW_<it.name>_in_<it.inName><it.tokenIndex>}, |
| words64=it.bits)>}> |
| } |
| >> |
| |
| parserCtorBody() ::= << |
| <if(memoize)> |
| <if(grammar.grammarIsRoot)> |
| this.state.ruleMemo = new Array(<length(grammar.allImportedRules)>+1);<\n> <! index from 1..n !> |
| <endif> |
| <endif> |
| <grammar.delegators: |
| {g|this.<g:delegateName()> = <g:delegateName()>;}; separator="\n"> |
| >> |
| |
| parser(grammar, name, scopes, tokens, tokenNames, rules, numRules, bitsets, ASTLabelType="Object", superClass="Parser", labelType="Token", members={<actions.parser.members>}) ::= << |
| <genericParser(grammar, name, scopes, tokens, tokenNames, rules, numRules, |
| bitsets, "TokenStream", superClass, |
| labelType, members, "Token", |
| false, ASTLabelType)> |
| >> |
| |
| /** How to generate a tree parser; same as parser except the input |
| * stream is a different type. |
| */ |
| treeParser(grammar, name, scopes, tokens, tokenNames, globalAction, rules, |
| numRules, bitsets, filterMode, labelType={<ASTLabelType>}, ASTLabelType="Object", |
| superClass="TreeParser", members={<actions.treeparser.members>}) ::= << |
| <genericParser(grammar, name, scopes, tokens, tokenNames, rules, numRules, |
| bitsets, "TreeNodeStream", superClass, |
| labelType, members, "Node", |
| filterMode, ASTLabelType)> |
| >> |
| |
| /** A simpler version of a rule template that is specific to the imaginary |
| * rules created for syntactic predicates. As they never have return values |
| * nor parameters etc..., just give simplest possible method. Don't do |
| * any of the normal memoization stuff in here either; it's a waste. |
| * As predicates cannot be inlined into the invoking rule, they need to |
| * be in a rule by themselves. |
| */ |
| synpredRule(ruleName, ruleDescriptor, block, description, nakedBlock) ::= |
| << |
| // $ANTLR start <ruleName> |
| public final function <ruleName>_fragment(<ruleDescriptor.parameterScope:parameterScope()>):void { |
| <ruleLabelDefs()> |
| <if(trace)> |
| traceIn("<ruleName>_fragment", <ruleDescriptor.index>); |
| try { |
| <block> |
| } |
| finally { |
| traceOut("<ruleName>_fragment", <ruleDescriptor.index>); |
| } |
| <else> |
| <block> |
| <endif> |
| } |
| // $ANTLR end <ruleName> |
| >> |
| |
| synpred(name) ::= << |
| public final function <name>():Boolean { |
| this.state.backtracking++; |
| <@start()> |
| var start:int = input.mark(); |
| try { |
| <name>_fragment(); // can never throw exception |
| } catch (re:RecognitionException) { |
| trace("impossible: "+re); |
| } |
| var success:Boolean = !this.state.failed; |
| input.rewindTo(start); |
| <@stop()> |
| this.state.backtracking--; |
| this.state.failed=false; |
| return success; |
| }<\n> |
| >> |
| |
| lexerSynpred(name) ::= << |
| <synpred(name)> |
| >> |
| |
| ruleMemoization(name) ::= << |
| <if(memoize)> |
| if ( this.state.backtracking>0 && alreadyParsedRule(input, <ruleDescriptor.index>) ) { return <ruleReturnValue()>; } |
| <endif> |
| >> |
| |
| /** How to test for failure and return from rule */ |
| checkRuleBacktrackFailure() ::= << |
| <if(backtracking)>if (this.state.failed) return <ruleReturnValue()>;<endif> |
| >> |
| |
| /** This rule has failed, exit indicating failure during backtrack */ |
| ruleBacktrackFailure() ::= << |
| <if(backtracking)>if (this.state.backtracking>0) {this.state.failed=true; return <ruleReturnValue()>;}<endif> |
| >> |
| |
| /** How to generate code for a rule. This includes any return type |
| * data aggregates required for multiple return values. |
| */ |
| rule(ruleName,ruleDescriptor,block,emptyRule,description,exceptions,finally,memoize) ::= << |
| <ruleAttributeScope(scope=ruleDescriptor.ruleScope)> |
| // $ANTLR start <ruleName> |
| // <fileName>:<description> |
| public final function <ruleName>(<ruleDescriptor.parameterScope:parameterScope()>):<returnType()> { |
| <if(trace)>traceIn("<ruleName>", <ruleDescriptor.index>);<endif> |
| <ruleScopeSetUp()> |
| <ruleDeclarations()> |
| <ruleLabelDefs()> |
| <ruleDescriptor.actions.init> |
| <@preamble()> |
| try { |
| <ruleMemoization(name=ruleName)> |
| <block> |
| <ruleCleanUp()> |
| <(ruleDescriptor.actions.after):execAction()> |
| } |
| <if(exceptions)> |
| <exceptions:{e|<catch(decl=e.decl,action=e.action)><\n>}> |
| <else> |
| <if(!emptyRule)> |
| <if(actions.(actionScope).rulecatch)> |
| <actions.(actionScope).rulecatch> |
| <else> |
| catch (re:RecognitionException) { |
| reportError(re); |
| recoverStream(input,re); |
| <@setErrorReturnValue()> |
| }<\n> |
| <endif> |
| <endif> |
| <endif> |
| finally { |
| <if(trace)>traceOut("<ruleName>", <ruleDescriptor.index>);<endif> |
| <memoize()> |
| <ruleScopeCleanUp()> |
| <finally> |
| } |
| <@postamble()> |
| return <ruleReturnValue()>; |
| } |
| // $ANTLR end <ruleName> |
| >> |
| |
| catch(decl,action) ::= << |
| catch (<e.decl>) { |
| <e.action> |
| } |
| >> |
| |
| ruleDeclarations() ::= << |
| <if(ruleDescriptor.hasMultipleReturnValues)> |
| var retval:<returnType()> = new <returnType()>(); |
| retval.start = input.LT(1);<\n> |
| <else> |
| <ruleDescriptor.returnScope.attributes:{ a | |
| var <a.name>:<a.type> = <if(a.initValue)><a.initValue><else><initValue(a.type)><endif>; |
| }> |
| <endif> |
| <if(memoize)> |
| var <ruleDescriptor.name>_StartIndex:int = input.index; |
| <endif> |
| >> |
| |
| ruleScopeSetUp() ::= << |
| <ruleDescriptor.useScopes:{it |<it>_stack.push(new Object());}; separator="\n"> |
| <ruleDescriptor.ruleScope:{it |<it.name>_stack.push(new Object());}; separator="\n"> |
| >> |
| |
| ruleScopeCleanUp() ::= << |
| <ruleDescriptor.useScopes:{it |<it>_stack.pop();}; separator="\n"> |
| <ruleDescriptor.ruleScope:{it |<it.name>_stack.pop();}; separator="\n"> |
| >> |
| |
| ruleLabelDefs() ::= << |
| <[ruleDescriptor.tokenLabels,ruleDescriptor.tokenListLabels, |
| ruleDescriptor.wildcardTreeLabels,ruleDescriptor.wildcardTreeListLabels] |
| :{it |var <it.label.text>:<labelType>=null;}; separator="\n" |
| > |
| <[ruleDescriptor.tokenListLabels,ruleDescriptor.ruleListLabels,ruleDescriptor.wildcardTreeListLabels] |
| :{it |var list_<it.label.text>:Array=null;}; separator="\n" |
| > |
| <ruleDescriptor.ruleLabels:ruleLabelDef(); separator="\n"> |
| <ruleDescriptor.ruleListLabels:{ll|var <ll.label.text>:RuleReturnScope = null;}; separator="\n"> |
| >> |
| |
| lexerRuleLabelDefs() ::= << |
| <[ruleDescriptor.tokenLabels, |
| ruleDescriptor.tokenListLabels, |
| ruleDescriptor.ruleLabels] |
| :{it |var <it.label.text>:<labelType>=null;}; separator="\n" |
| > |
| <ruleDescriptor.charLabels:{it |var <it.label.text>:int;}; separator="\n"> |
| <[ruleDescriptor.tokenListLabels, |
| ruleDescriptor.ruleListLabels] |
| :{it |var list_<it.label.text>:Array=null;}; separator="\n" |
| > |
| >> |
| |
| ruleReturnValue() ::= <% |
| <if(!ruleDescriptor.isSynPred)> |
| <if(ruleDescriptor.hasReturnValue)> |
| <if(ruleDescriptor.hasSingleReturnValue)> |
| <ruleDescriptor.singleValueReturnName> |
| <else> |
| retval |
| <endif> |
| <endif> |
| <endif> |
| %> |
| |
| ruleCleanUp() ::= << |
| <if(ruleDescriptor.hasMultipleReturnValues)> |
| <if(!TREE_PARSER)> |
| retval.stop = input.LT(-1);<\n> |
| <endif> |
| <endif> |
| >> |
| |
| memoize() ::= << |
| <if(memoize)> |
| <if(backtracking)> |
| if ( this.state.backtracking>0 ) { memoize(input, <ruleDescriptor.index>, <ruleDescriptor.name>_StartIndex); } |
| <endif> |
| <endif> |
| >> |
| |
| /** How to generate a rule in the lexer; naked blocks are used for |
| * fragment rules. |
| */ |
| lexerRule(ruleName,nakedBlock,ruleDescriptor,block,memoize) ::= << |
| // $ANTLR start <ruleName> |
| public final function m<ruleName>(<ruleDescriptor.parameterScope:parameterScope()>):void { |
| <if(trace)>traceIn("<ruleName>", <ruleDescriptor.index>);<endif> |
| <ruleScopeSetUp()> |
| <ruleDeclarations()> |
| try { |
| <if(nakedBlock)> |
| <ruleMemoization(name=ruleName)> |
| <lexerRuleLabelDefs()> |
| <ruleDescriptor.actions.init> |
| <block><\n> |
| <else> |
| var _type:int = <ruleName>; |
| var _channel:int = DEFAULT_TOKEN_CHANNEL; |
| <ruleMemoization(name=ruleName)> |
| <lexerRuleLabelDefs()> |
| <ruleDescriptor.actions.init> |
| <block> |
| <ruleCleanUp()> |
| this.state.type = _type; |
| this.state.channel = _channel; |
| <(ruleDescriptor.actions.after):execAction()> |
| <endif> |
| } |
| finally { |
| <if(trace)>traceOut("<ruleName>", <ruleDescriptor.index>);<endif> |
| <ruleScopeCleanUp()> |
| <memoize()> |
| } |
| } |
| // $ANTLR end <ruleName> |
| >> |
| |
| /** How to generate code for the implicitly-defined lexer grammar rule |
| * that chooses between lexer rules. |
| */ |
| tokensRule(ruleName,nakedBlock,args,block,ruleDescriptor) ::= << |
| public override function mTokens():void { |
| <block><\n> |
| } |
| >> |
| |
| // S U B R U L E S |
| |
| /** A (...) subrule with multiple alternatives */ |
| block(alts,decls,decision,enclosingBlockLevel,blockLevel,decisionNumber,maxK,maxAlt,description) ::= << |
| // <fileName>:<description> |
| var alt<decisionNumber>:int=<maxAlt>; |
| <decls> |
| <@predecision()> |
| <decision> |
| <@postdecision()> |
| <@prebranch()> |
| switch (alt<decisionNumber>) { |
| <alts:{a | <altSwitchCase(i, a)>}> |
| } |
| <@postbranch()> |
| >> |
| |
| /** A rule block with multiple alternatives */ |
| ruleBlock(alts,decls,decision,enclosingBlockLevel,blockLevel,decisionNumber,maxK,maxAlt,description) ::= << |
| // <fileName>:<description> |
| var alt<decisionNumber>:int=<maxAlt>; |
| <decls> |
| <@predecision()> |
| <decision> |
| <@postdecision()> |
| switch (alt<decisionNumber>) { |
| <alts:{a | <altSwitchCase(i, a)>}> |
| } |
| >> |
| |
| ruleBlockSingleAlt(alts,decls,decision,enclosingBlockLevel,blockLevel,decisionNumber,description) ::= << |
| // <fileName>:<description> |
| <decls> |
| <@prealt()> |
| <alts> |
| <@postalt()> |
| >> |
| |
| /** A special case of a (...) subrule with a single alternative */ |
| blockSingleAlt(alts,decls,decision,enclosingBlockLevel,blockLevel,decisionNumber,description) ::= << |
| // <fileName>:<description> |
| <decls> |
| <@prealt()> |
| <alts> |
| <@postalt()> |
| >> |
| |
| /** A (..)+ block with 1 or more alternatives */ |
| positiveClosureBlock(alts,decls,decision,enclosingBlockLevel,blockLevel,decisionNumber,maxK,maxAlt,description) ::= << |
| // <fileName>:<description> |
| var cnt<decisionNumber>:int=0; |
| <decls> |
| <@preloop()> |
| loop<decisionNumber>: |
| do { |
| var alt<decisionNumber>:int=<maxAlt>; |
| <@predecision()> |
| <decision> |
| <@postdecision()> |
| switch (alt<decisionNumber>) { |
| <alts:{a | <altSwitchCase(i, a)>}> |
| default : |
| if ( cnt<decisionNumber> >= 1 ) break loop<decisionNumber>; |
| <ruleBacktrackFailure()> |
| throw new EarlyExitException(<decisionNumber>, input); |
| <! Need to add support for earlyExitException debug hook !> |
| } |
| cnt<decisionNumber>++; |
| } while (true); |
| <@postloop()> |
| >> |
| |
| positiveClosureBlockSingleAlt ::= positiveClosureBlock |
| |
| /** A (..)* block with 1 or more alternatives */ |
| closureBlock(alts,decls,decision,enclosingBlockLevel,blockLevel,decisionNumber,maxK,maxAlt,description) ::= << |
| // <fileName>:<description> |
| <decls> |
| <@preloop()> |
| loop<decisionNumber>: |
| do { |
| var alt<decisionNumber>:int=<maxAlt>; |
| <@predecision()> |
| <decision> |
| <@postdecision()> |
| switch (alt<decisionNumber>) { |
| <alts:{a | <altSwitchCase(i, a)>}> |
| default : |
| break loop<decisionNumber>; |
| } |
| } while (true); |
| <@postloop()> |
| >> |
| |
| closureBlockSingleAlt ::= closureBlock |
| |
| /** Optional blocks (x)? are translated to (x|) by before code generation |
| * so we can just use the normal block template |
| */ |
| optionalBlock ::= block |
| |
| optionalBlockSingleAlt ::= block |
| |
| /** A case in a switch that jumps to an alternative given the alternative |
| * number. A DFA predicts the alternative and then a simple switch |
| * does the jump to the code that actually matches that alternative. |
| */ |
| altSwitchCase(altNum, alt) ::= << |
| case <altNum> : |
| <@prealt()> |
| <alt> |
| break;<\n> |
| >> |
| |
| /** An alternative is just a list of elements; at outermost level */ |
| alt(elements,altNum,description,autoAST,outerAlt,treeLevel,rew) ::= << |
| // <fileName>:<description> |
| { |
| <@declarations()> |
| <elements:element()> |
| <rew> |
| <@cleanup()> |
| } |
| >> |
| |
| /** What to emit when there is no rewrite. For auto build |
| * mode, does nothing. |
| */ |
| noRewrite(rewriteBlockLevel, treeLevel) ::= "" |
| |
| // E L E M E N T S |
| |
| /** Dump the elements one per line */ |
| element(e) ::= << |
| <@prematch()> |
| <e.el><\n> |
| >> |
| |
| /** match a token optionally with a label in front */ |
| tokenRef(token,label,elementIndex,terminalOptions) ::= << |
| <if(label)><label>=<labelType>(<endif>matchStream(input,<token>,FOLLOW_<token>_in_<ruleName><elementIndex>)<if(label)>)<endif>; <checkRuleBacktrackFailure()> |
| >> |
| |
| /** ids+=ID */ |
| tokenRefAndListLabel(token,label,elementIndex,terminalOptions) ::= << |
| <tokenRef(token,label,elementIndex,terminalOptions)> |
| <listLabel(label, label)> |
| >> |
| |
| listLabel(label,elem) ::= << |
| if (list_<label>==null) list_<label>=new Array(); |
| list_<label>.push(<elem>);<\n> |
| >> |
| |
| /** match a character */ |
| charRef(char,label) ::= << |
| <if(label)> |
| <label> = input.LA(1);<\n> |
| <endif> |
| match(<char>); <checkRuleBacktrackFailure()> |
| >> |
| |
| /** match a character range */ |
| charRangeRef(a,b,label) ::= << |
| <if(label)> |
| <label> = input.LA(1);<\n> |
| <endif> |
| matchRange(<a>,<b>); <checkRuleBacktrackFailure()> |
| >> |
| |
| /** For now, sets are interval tests and must be tested inline */ |
| matchSet(s,label,elementIndex,terminalOptions,postmatchCode="") ::= << |
| <if(label)> |
| <if(LEXER)> |
| <label>= input.LA(1);<\n> |
| <else> |
| <label>=<labelType>(input.LT(1));<\n> |
| <endif> |
| <endif> |
| if ( <s> ) { |
| input.consume(); |
| <postmatchCode> |
| <if(!LEXER)> |
| this.state.errorRecovery=false; |
| <endif> |
| <if(backtracking)>this.state.failed=false;<endif> |
| } |
| else { |
| <ruleBacktrackFailure()> |
| <@mismatchedSetException()> |
| <if(LEXER)> |
| throw recover(new MismatchedSetException(null,input));<\n> |
| <else> |
| throw new MismatchedSetException(null,input); |
| <! use following code to make it recover inline; remove throw mse; |
| recoverFromMismatchedSet(input,mse,FOLLOW_set_in_<ruleName><elementIndex>); |
| !> |
| <endif> |
| }<\n> |
| >> |
| |
| matchRuleBlockSet ::= matchSet |
| |
| matchSetAndListLabel(s,label,elementIndex,postmatchCode) ::= << |
| <matchSet(...)> |
| <listLabel(label, label)> |
| >> |
| |
| /** Match a string literal */ |
| lexerStringRef(string,label,elementIndex="0") ::= << |
| <if(label)> |
| var <label>Start:int = charIndex; |
| matchString(<string>); <checkRuleBacktrackFailure()> |
| var <label>StartLine<elementIndex>:int = line; |
| var <label>StartCharPos<elementIndex>:int = charPositionInLine; |
| <label> = CommonToken.createFromStream(input, TokenConstants.INVALID_TOKEN_TYPE, TokenConstants.DEFAULT_CHANNEL, <label>Start, charIndex-1); |
| <label>.line = <label>StartLine<elementIndex>; |
| <label>.charPositionInLine = <label>StartCharPos<elementIndex>; |
| <else> |
| matchString(<string>); <checkRuleBacktrackFailure()><\n> |
| <endif> |
| >> |
| |
| wildcard(token,label,elementIndex,terminalOptions) ::= << |
| <if(label)> |
| <label>=<labelType>(input.LT(1));<\n> |
| <endif> |
| matchAny(input); <checkRuleBacktrackFailure()> |
| >> |
| |
| wildcardAndListLabel(token,label,elementIndex,terminalOptions) ::= << |
| <wildcard(...)> |
| <listLabel(label, label)> |
| >> |
| |
| /** Match . wildcard in lexer */ |
| wildcardChar(label, elementIndex) ::= << |
| <if(label)> |
| <label> = input.LA(1);<\n> |
| <endif> |
| matchAny(); <checkRuleBacktrackFailure()> |
| >> |
| |
| wildcardCharListLabel(label, elementIndex) ::= << |
| <wildcardChar(label, elementIndex)> |
| <listLabel(label, label)> |
| >> |
| |
| /** Match a rule reference by invoking it possibly with arguments |
| * and a return value or values. The 'rule' argument was the |
| * target rule name, but now is type Rule, whose toString is |
| * same: the rule name. Now though you can access full rule |
| * descriptor stuff. |
| * |
| * GMS: Note: do not use post-decrement operator! ASC produces bad code for exceptions in this case. |
| * See: https://bugs.adobe.com/jira/browse/ASC-3625 |
| */ |
| ruleRef(rule,label,elementIndex,args,scope) ::= << |
| pushFollow(FOLLOW_<rule.name>_in_<ruleName><elementIndex>); |
| <if(label)><label>=<endif><if(scope)><scope:delegateName()>.<endif><rule.name>(<args; separator=", ">);<\n> |
| state._fsp = state._fsp - 1; |
| <checkRuleBacktrackFailure()> |
| >> |
| |
| |
| /** ids+=r */ |
| ruleRefAndListLabel(rule,label,elementIndex,args,scope) ::= << |
| <ruleRef(rule,label,elementIndex,args,scope)> |
| <listLabel(label, label)> |
| >> |
| |
| /** A lexer rule reference. |
| * |
| * The 'rule' argument was the target rule name, but now |
| * is type Rule, whose toString is same: the rule name. |
| * Now though you can access full rule descriptor stuff. |
| */ |
| lexerRuleRef(rule,label,args,elementIndex,scope) ::= << |
| <if(label)> |
| var <label>Start<elementIndex>:int = charIndex; |
| var <label>StartLine<elementIndex>:int = line; |
| var <label>StartCharPos<elementIndex>:int = charPositionInLine; |
| <if(scope)><scope:delegateName()>.<endif>m<rule.name>(<args; separator=", ">); <checkRuleBacktrackFailure()> |
| <label> = CommonToken.createFromStream(input, TokenConstants.INVALID_TOKEN_TYPE, TokenConstants.DEFAULT_CHANNEL, <label>Start<elementIndex>, charIndex-1); |
| <label>.line = <label>StartLine<elementIndex>; |
| <label>.charPositionInLine = <label>StartCharPos<elementIndex>; |
| <else> |
| <if(scope)><scope:delegateName()>.<endif>m<rule.name>(<args; separator=", ">); <checkRuleBacktrackFailure()> |
| <endif> |
| >> |
| |
| /** i+=INT in lexer */ |
| lexerRuleRefAndListLabel(rule,label,args,elementIndex,scope) ::= << |
| <lexerRuleRef(rule,label,args,elementIndex,scope)> |
| <listLabel(label, label)> |
| >> |
| |
| /** EOF in the lexer */ |
| lexerMatchEOF(label,elementIndex) ::= << |
| <if(label)> |
| var <label>Start<elementIndex>:int = charIndex; |
| var <label>StartLine<elementIndex>:int = line; |
| var <label>StartCharPos<elementIndex>:int = charPositionInLine; |
| match(EOF); <checkRuleBacktrackFailure()> |
| var <label>:<labelType> = CommonToken.createFromStream(input, EOF, TokenConstants.DEFAULT_CHANNEL, <label>Start<elementIndex>, charIndex-1); |
| <label>.line = <label>StartLine<elementIndex>; |
| <label>.charPositionInLine = <label>StartCharPos<elementIndex>; |
| <else> |
| match(EOF); <checkRuleBacktrackFailure()> |
| <endif> |
| >> |
| |
| // used for left-recursive rules |
| recRuleDefArg() ::= "var <recRuleArg()>:int" |
| recRuleArg() ::= "_p" |
| recRuleAltPredicate(ruleName,opPrec) ::= "<recRuleArg()> \<= <opPrec>" |
| recRuleSetResultAction() ::= "root_0=$<ruleName>_primary.tree;" |
| recRuleSetReturnAction(src,name) ::= "$<name>=$<src>.<name>;" |
| |
| /** match ^(root children) in tree parser */ |
| tree(root, actionsAfterRoot, children, nullableChildList, |
| enclosingTreeLevel, treeLevel) ::= << |
| <root:element()> |
| <actionsAfterRoot:element()> |
| <if(nullableChildList)> |
| if ( input.LA(1)==TokenConstants.DOWN ) { |
| matchStream(input, TokenConstants.DOWN, null); <checkRuleBacktrackFailure()> |
| <children:element()> |
| matchStream(input, TokenConstants.UP, null); <checkRuleBacktrackFailure()> |
| } |
| <else> |
| matchStream(input, TokenConstants.DOWN, null); <checkRuleBacktrackFailure()> |
| <children:element()> |
| matchStream(input, TokenConstants.UP, null); <checkRuleBacktrackFailure()> |
| <endif> |
| >> |
| |
| /** Every predicate is used as a validating predicate (even when it is |
| * also hoisted into a prediction expression). |
| */ |
| validateSemanticPredicate(pred,description) ::= << |
| if ( !(<evalPredicate(pred,description)>) ) { |
| <ruleBacktrackFailure()> |
| throw new FailedPredicateException(input, "<ruleName>", "<description>"); |
| } |
| >> |
| |
| // F i x e d D F A (if-then-else) |
| |
| dfaState(k,edges,eotPredictsAlt,description,stateNumber,semPredState) ::= << |
| var LA<decisionNumber>_<stateNumber>:int = input.LA(<k>);<\n> |
| <edges; separator="\nelse "> |
| else { |
| <if(eotPredictsAlt)> |
| alt<decisionNumber>=<eotPredictsAlt>; |
| <else> |
| <ruleBacktrackFailure()> |
| throw new NoViableAltException("<description>", <decisionNumber>, <stateNumber>, input);<\n> |
| <! Need to add hook for noViableAltException() !> |
| <endif> |
| } |
| >> |
| |
| /** Same as a normal DFA state except that we don't examine lookahead |
| * for the bypass alternative. It delays error detection but this |
| * is faster, smaller, and more what people expect. For (X)? people |
| * expect "if ( LA(1)==X ) match(X);" and that's it. |
| */ |
| dfaOptionalBlockState(k,edges,eotPredictsAlt,description,stateNumber,semPredState) ::= << |
| var LA<decisionNumber>_<stateNumber>:int = input.LA(<k>);<\n> |
| <edges; separator="\nelse "> |
| >> |
| |
| /** A DFA state that is actually the loopback decision of a closure |
| * loop. If end-of-token (EOT) predicts any of the targets then it |
| * should act like a default clause (i.e., no error can be generated). |
| * This is used only in the lexer so that for ('a')* on the end of a rule |
| * anything other than 'a' predicts exiting. |
| */ |
| dfaLoopbackState(k,edges,eotPredictsAlt,description,stateNumber,semPredState) ::= << |
| var LA<decisionNumber>_<stateNumber>:int = input.LA(<k>);<\n> |
| <edges; separator="\nelse "><\n> |
| <if(eotPredictsAlt)> |
| <if(!edges)> |
| alt<decisionNumber>=<eotPredictsAlt>; <! if no edges, don't gen ELSE !> |
| <else> |
| else { |
| alt<decisionNumber>=<eotPredictsAlt>; |
| }<\n> |
| <endif> |
| <endif> |
| >> |
| |
| /** An accept state indicates a unique alternative has been predicted */ |
| dfaAcceptState(alt) ::= "alt<decisionNumber>=<alt>;" |
| |
| /** A simple edge with an expression. If the expression is satisfied, |
| * enter to the target state. To handle gated productions, we may |
| * have to evaluate some predicates for this edge. |
| */ |
| dfaEdge(labelExpr, targetState, predicates) ::= << |
| if ( (<labelExpr>) <if(predicates)>&& (<predicates>)<endif>) { |
| <targetState> |
| } |
| >> |
| |
| // F i x e d D F A (switch case) |
| |
| /** A DFA state where a SWITCH may be generated. The code generator |
| * decides if this is possible: CodeGenerator.canGenerateSwitch(). |
| */ |
| dfaStateSwitch(k,edges,eotPredictsAlt,description,stateNumber,semPredState) ::= << |
| switch ( input.LA(<k>) ) { |
| <edges; separator="\n"> |
| default: |
| <if(eotPredictsAlt)> |
| alt<decisionNumber>=<eotPredictsAlt>; |
| <else> |
| <ruleBacktrackFailure()> |
| throw new NoViableAltException("<description>", <decisionNumber>, <stateNumber>, input);<\n> |
| <! Need to add hook for noViableAltException !> |
| <endif> |
| }<\n> |
| >> |
| |
| dfaOptionalBlockStateSwitch(k,edges,eotPredictsAlt,description,stateNumber,semPredState) ::= << |
| switch ( input.LA(<k>) ) { |
| <edges; separator="\n"> |
| }<\n> |
| >> |
| |
| dfaLoopbackStateSwitch(k, edges,eotPredictsAlt,description,stateNumber,semPredState) ::= << |
| switch ( input.LA(<k>) ) { |
| <edges; separator="\n"><\n> |
| <if(eotPredictsAlt)> |
| default: |
| alt<decisionNumber>=<eotPredictsAlt>; |
| break;<\n> |
| <endif> |
| }<\n> |
| >> |
| |
| dfaEdgeSwitch(labels, targetState) ::= << |
| <labels:{it |case <it>:}; separator="\n"> |
| { |
| <targetState> |
| } |
| break; |
| >> |
| |
| // C y c l i c D F A |
| |
| /** The code to initiate execution of a cyclic DFA; this is used |
| * in the rule to predict an alt just like the fixed DFA case. |
| * The <name> attribute is inherited via the parser, lexer, ... |
| */ |
| dfaDecision(decisionNumber,description) ::= << |
| alt<decisionNumber> = dfa<decisionNumber>.predict(input); |
| >> |
| |
| cyclicDFACtor(dfa) ::= << |
| |
| dfa<dfa.decisionNumber> = new DFA(this, <dfa.decisionNumber>, |
| "<dfa.description>", |
| DFA<dfa.decisionNumber>_eot, DFA<dfa.decisionNumber>_eof, DFA<dfa.decisionNumber>_min, |
| DFA<dfa.decisionNumber>_max, DFA<dfa.decisionNumber>_accept, DFA<dfa.decisionNumber>_special, |
| DFA<dfa.decisionNumber>_transition<if(dfa.specialStateSTs)>, DFA<dfa.decisionNumber>_specialStateTransition<endif>); |
| |
| >> |
| /* Dump DFA tables as run-length-encoded Strings of octal values. |
| * Can't use hex as compiler translates them before compilation. |
| * These strings are split into multiple, concatenated strings. |
| * Java puts them back together at compile time thankfully. |
| * Java cannot handle large static arrays, so we're stuck with this |
| * encode/decode approach. See analysis and runtime DFA for |
| * the encoding methods. |
| */ |
| cyclicDFA(dfa) ::= << |
| |
| private const DFA<dfa.decisionNumber>_eot:Array = |
| DFA.unpackEncodedString("<dfa.javaCompressedEOT; wrap="\"+\n \"">"); |
| private const DFA<dfa.decisionNumber>_eof:Array = |
| DFA.unpackEncodedString("<dfa.javaCompressedEOF; wrap="\"+\n \"">"); |
| private const DFA<dfa.decisionNumber>_min:Array = |
| DFA.unpackEncodedString("<dfa.javaCompressedMin; wrap="\"+\n \"">", true); |
| private const DFA<dfa.decisionNumber>_max:Array = |
| DFA.unpackEncodedString("<dfa.javaCompressedMax; wrap="\"+\n \"">", true); |
| private const DFA<dfa.decisionNumber>_accept:Array = |
| DFA.unpackEncodedString("<dfa.javaCompressedAccept; wrap="\"+\n \"">"); |
| private const DFA<dfa.decisionNumber>_special:Array = |
| DFA.unpackEncodedString("<dfa.javaCompressedSpecial; wrap="\"+\n \"">"); |
| private const DFA<dfa.decisionNumber>_transition:Array = [ |
| <dfa.javaCompressedTransition:{s|DFA.unpackEncodedString("<s; wrap="\"+\n\"">")}; separator=",\n"> |
| ]; |
| <if(dfa.specialStateSTs)> |
| private function DFA<dfa.decisionNumber>_specialStateTransition(dfa:DFA, s:int, _input:IntStream):int { |
| <if(LEXER)> |
| var input:IntStream = _input; |
| <endif> |
| <if(PARSER)> |
| var input:TokenStream = TokenStream(_input); |
| <endif> |
| <if(TREE_PARSER)> |
| var input:TreeNodeStream = TreeNodeStream(_input); |
| <endif> |
| var _s:int = s; |
| switch ( s ) { |
| <dfa.specialStateSTs:{state | |
| case <i0> : <! compressed special state numbers 0..n-1 !> |
| <state>}; separator="\n"> |
| } |
| <if(backtracking)> |
| if (this.state.backtracking>0) {this.state.failed=true; return -1;}<\n> |
| <endif> |
| throw dfa.error(new NoViableAltException(dfa.description, <dfa.decisionNumber>, _s, input)); |
| }<\n> |
| <endif> |
| |
| protected var dfa<dfa.decisionNumber>:DFA; // initialized in constructor |
| |
| >> |
| |
| /** A state in a cyclic DFA; it's a special state and part of a big switch on |
| * state. |
| */ |
| cyclicDFAState(decisionNumber,stateNumber,edges,needErrorClause,semPredState) ::= << |
| var LA<decisionNumber>_<stateNumber>:int = input.LA(1);<\n> |
| <if(semPredState)> <! get next lookahead symbol to test edges, then rewind !> |
| var index<decisionNumber>_<stateNumber>:int = input.index; |
| input.rewind();<\n> |
| <endif> |
| s = -1; |
| <edges; separator="\nelse "> |
| <if(semPredState)> <! return input cursor to state before we rewound !> |
| input.seek(index<decisionNumber>_<stateNumber>);<\n> |
| <endif> |
| if ( s>=0 ) return s; |
| break; |
| >> |
| |
| /** Just like a fixed DFA edge, test the lookahead and indicate what |
| * state to jump to next if successful. |
| */ |
| cyclicDFAEdge(labelExpr, targetStateNumber, edgeNumber, predicates) ::= << |
| if ( (<labelExpr>) <if(predicates)>&& (<predicates>)<endif>) {s = <targetStateNumber>;}<\n> |
| >> |
| |
| /** An edge pointing at end-of-token; essentially matches any char; |
| * always jump to the target. |
| */ |
| eotDFAEdge(targetStateNumber,edgeNumber, predicates) ::= << |
| s = <targetStateNumber>;<\n> |
| >> |
| |
| |
| // D F A E X P R E S S I O N S |
| |
| andPredicates(left,right) ::= "(<left>&&<right>)" |
| |
| orPredicates(operands) ::= "(<operands; separator=\"||\">)" |
| |
| notPredicate(pred) ::= "!(<evalPredicate(pred,{})>)" |
| |
| evalPredicate(pred,description) ::= "(<pred>)" |
| |
| evalSynPredicate(pred,description) ::= "<pred>()" |
| |
| lookaheadTest(atom,k,atomAsInt) ::= "LA<decisionNumber>_<stateNumber>==<atomAsInt>" |
| |
| /** Sometimes a lookahead test cannot assume that LA(k) is in a temp variable |
| * somewhere. Must ask for the lookahead directly. |
| */ |
| isolatedLookaheadTest(atom,k,atomAsInt) ::= "input.LA(<k>)==<atomAsInt>" |
| |
| lookaheadRangeTest(lower,upper,k,rangeNumber,lowerAsInt,upperAsInt) ::= <% |
| (LA<decisionNumber>_<stateNumber> >= <lowerAsInt> && LA<decisionNumber>_<stateNumber> \<= <upperAsInt>) |
| %> |
| |
| isolatedLookaheadRangeTest(lower,upper,k,rangeNumber,lowerAsInt,upperAsInt) ::= "(input.LA(<k>) >= <lowerAsInt> && input.LA(<k>) \<= <upperAsInt>)" |
| |
| setTest(ranges) ::= << |
| <ranges; separator="||"> |
| >> |
| |
| // A T T R I B U T E S |
| |
| globalAttributeScope(scope) ::= << |
| <if(scope.attributes)> |
| protected var <scope.name>_stack:Array = new Array();<\n> |
| <endif> |
| >> |
| |
| ruleAttributeScope(scope) ::= << |
| <if(scope.attributes)> |
| protected var <scope.name>_stack:Array = new Array();<\n> |
| <endif> |
| >> |
| |
| returnStructName() ::= "<if(TREE_PARSER)>Tree<else>Parser<endif>RuleReturnScope" |
| |
| returnType() ::= << |
| <if(ruleDescriptor.hasMultipleReturnValues)> |
| <returnStructName()> |
| <else> |
| <if(ruleDescriptor.hasSingleReturnValue)> |
| <ruleDescriptor.singleValueReturnType> |
| <else> |
| void |
| <endif> |
| <endif> |
| >> |
| |
| /** Generate the Java type associated with a single or multiple return |
| * values. |
| */ |
| ruleLabelType(referencedRule) ::= << |
| <if(referencedRule.hasMultipleReturnValues)> |
| <returnStructName()> |
| <else> |
| <if(referencedRule.hasSingleReturnValue)> |
| <referencedRule.singleValueReturnType> |
| <else> |
| void |
| <endif> |
| <endif> |
| >> |
| |
| delegateName(d) ::= << |
| <if(d.label)><d.label><else>g<d.name><endif> |
| >> |
| |
| /** Using a type to init value map, try to init a type; if not in table |
| * must be an object, default value is "null". |
| */ |
| initValue(typeName) ::= << |
| <asTypeInitMap.(typeName)> |
| >> |
| |
| /** Define a rule label including default value */ |
| ruleLabelDef(label) ::= << |
| var <label.label.text>:<ruleLabelType(referencedRule=label.referencedRule)> = <initValue(typeName=ruleLabelType(referencedRule=label.referencedRule))>;<\n> |
| >> |
| |
| /** Define a return struct for a rule if the code needs to access its |
| * start/stop tokens, tree stuff, attributes, ... Leave a hole for |
| * subgroups to stick in members. |
| */ |
| returnScope(scope) ::= << |
| <if(ruleDescriptor.hasMultipleReturnValues)> |
| public static class <returnType()> extends <if(TREE_PARSER)>Tree<else>Parser<endif>RuleReturnScope { |
| <scope.attributes:{it |public <it.decl>;}; separator="\n"> |
| <@ruleReturnMembers()> |
| }; |
| <endif> |
| >> |
| |
| parameterScope(scope) ::= << |
| <scope.attributes:{it |<it.name>:<it.type>}; separator=", "> |
| >> |
| |
| parameterAttributeRef(attr) ::= "<attr.name>" |
| parameterSetAttributeRef(attr,expr) ::= "<attr.name> =<expr>;" |
| |
| scopeAttributeRef(scope,attr,index,negIndex) ::= << |
| <if(negIndex)> |
| <scope>_stack[<scope>_stack.length-<negIndex>-1].<attr.name> |
| <else> |
| <if(index)> |
| <scope>_stack[<index>].<attr.name> |
| <else> |
| <scope>_stack[<scope>_stack.length-1].<attr.name> |
| <endif> |
| <endif> |
| >> |
| |
| scopeSetAttributeRef(scope,attr,expr,index,negIndex) ::= << |
| <if(negIndex)> |
| <scope>_stack[<scope>_stack.length-<negIndex>-1].<attr.name> =<expr>; |
| <else> |
| <if(index)> |
| <scope>_stack[<index>].<attr.name> =<expr>; |
| <else> |
| <scope>_stack[<scope>_stack.length-1].<attr.name> =<expr>; |
| <endif> |
| <endif> |
| >> |
| |
| /** $x is either global scope or x is rule with dynamic scope; refers |
| * to stack itself not top of stack. This is useful for predicates |
| * like {$function.size()>0 && $function::name.equals("foo")}? |
| */ |
| isolatedDynamicScopeRef(scope) ::= "<scope>_stack" |
| |
| /** reference an attribute of rule; might only have single return value */ |
| ruleLabelRef(referencedRule,scope,attr) ::= << |
| <if(referencedRule.hasMultipleReturnValues)> |
| (<scope>!=null?<scope>.values.<attr.name>:<initValue(attr.type)>) |
| <else> |
| <scope> |
| <endif> |
| >> |
| |
| returnAttributeRef(ruleDescriptor,attr) ::= << |
| <if(ruleDescriptor.hasMultipleReturnValues)> |
| retval.values.<attr.name> |
| <else> |
| <attr.name> |
| <endif> |
| >> |
| |
| returnSetAttributeRef(ruleDescriptor,attr,expr) ::= << |
| <if(ruleDescriptor.hasMultipleReturnValues)> |
| retval.values.<attr.name> =<expr>; |
| <else> |
| <attr.name> =<expr>; |
| <endif> |
| >> |
| |
| /** How to translate $tokenLabel */ |
| tokenLabelRef(label) ::= "<label>" |
| |
| /** ids+=ID {$ids} or e+=expr {$e} */ |
| listLabelRef(label) ::= "list_<label>" |
| |
| |
| // not sure the next are the right approach |
| |
| tokenLabelPropertyRef_text(scope,attr) ::= "(<scope>!=null?<scope>.text:null)" |
| tokenLabelPropertyRef_type(scope,attr) ::= "(<scope>!=null?<scope>.type:0)" |
| tokenLabelPropertyRef_line(scope,attr) ::= "(<scope>!=null?<scope>.line:0)" |
| tokenLabelPropertyRef_pos(scope,attr) ::= "(<scope>!=null?<scope>.charPositionInLine:0)" |
| tokenLabelPropertyRef_channel(scope,attr) ::= "(<scope>!=null?<scope>.channel:0)" |
| tokenLabelPropertyRef_index(scope,attr) ::= "(<scope>!=null?<scope>.tokenIndex:0)" |
| tokenLabelPropertyRef_tree(scope,attr) ::= "<scope>_tree" |
| tokenLabelPropertyRef_int(scope,attr) ::= "(<scope>!=null?int(<scope>.text):0)" |
| |
| ruleLabelPropertyRef_start(scope,attr) ::= "(<scope>!=null?<labelType>(<scope>.start):null)" |
| ruleLabelPropertyRef_stop(scope,attr) ::= "(<scope>!=null?<labelType>(<scope>.stop):null)" |
| ruleLabelPropertyRef_tree(scope,attr) ::= "(<scope>!=null?<ASTLabelType>(<scope>.tree):null)" |
| ruleLabelPropertyRef_text(scope,attr) ::= << |
| <if(TREE_PARSER)> |
| (<scope>!=null?(input.tokenStream.toStringWithRange( |
| input.treeAdaptor.getTokenStartIndex(<scope>.start), |
| input.treeAdaptor.getTokenStopIndex(<scope>.start))):null) |
| <else> |
| (<scope>!=null?input.toStringWithTokenRange(<scope>.start,<scope>.stop):null) |
| <endif> |
| >> |
| |
| ruleLabelPropertyRef_st(scope,attr) ::= "(<scope>!=null?<scope>.st:null)" |
| |
| /** Isolated $RULE ref ok in lexer as it's a Token */ |
| lexerRuleLabel(label) ::= "<label>" |
| |
| lexerRuleLabelPropertyRef_type(scope,attr) ::= |
| "(<scope>!=null?<scope>.type:0)" |
| lexerRuleLabelPropertyRef_line(scope,attr) ::= |
| "(<scope>!=null?<scope>.lien:0)" |
| lexerRuleLabelPropertyRef_pos(scope,attr) ::= |
| "(<scope>!=null?<scope>.charPositionInLine:0)" |
| lexerRuleLabelPropertyRef_channel(scope,attr) ::= |
| "(<scope>!=null?<scope>.channel:0)" |
| lexerRuleLabelPropertyRef_index(scope,attr) ::= |
| "(<scope>!=null?<scope>.tokenIndex:0)" |
| lexerRuleLabelPropertyRef_text(scope,attr) ::= |
| "(<scope>!=null?<scope>.text:null)" |
| lexerRuleLabelPropertyRef_int(scope,attr) ::= |
| "(<scope>!=null?int(<scope>.text):0)" |
| |
| // Somebody may ref $template or $tree or $stop within a rule: |
| rulePropertyRef_start(scope,attr) ::= "<labelType>(retval.start)" |
| rulePropertyRef_stop(scope,attr) ::= "<labelType>(retval.stop)" |
| rulePropertyRef_tree(scope,attr) ::= "<ASTLabelType>(retval.tree)" |
| rulePropertyRef_text(scope,attr) ::= << |
| <if(TREE_PARSER)> |
| input.tokenStream.toStringWithRange( |
| input.treeAdaptor.getTokenStartIndex(retval.start), |
| input.treeAdaptor.getTokenStopIndex(retval.start)) |
| <else> |
| input.toStringWithTokenRange(retval.start,input.LT(-1)) |
| <endif> |
| >> |
| rulePropertyRef_st(scope,attr) ::= "retval.st" |
| |
| lexerRulePropertyRef_text(scope,attr) ::= "text" |
| lexerRulePropertyRef_type(scope,attr) ::= "_type" |
| lexerRulePropertyRef_line(scope,attr) ::= "state.tokenStartLine" |
| lexerRulePropertyRef_pos(scope,attr) ::= "state.tokenStartCharPositionInLine" |
| lexerRulePropertyRef_index(scope,attr) ::= "-1" // undefined token index in lexer |
| lexerRulePropertyRef_channel(scope,attr) ::= "_channel" |
| lexerRulePropertyRef_start(scope,attr) ::= "state.tokenStartCharIndex" |
| lexerRulePropertyRef_stop(scope,attr) ::= "(charIndex-1)" |
| lexerRulePropertyRef_int(scope,attr) ::= "int(<scope>.text)" |
| |
| // setting $st and $tree is allowed in local rule. everything else |
| // is flagged as error |
| ruleSetPropertyRef_tree(scope,attr,expr) ::= "retval.tree =<expr>;" |
| ruleSetPropertyRef_st(scope,attr,expr) ::= "retval.st =<expr>;" |
| |
| /** How to execute an action (only when not backtracking) */ |
| execAction(action) ::= << |
| <if(backtracking)> |
| if ( <actions.(actionScope).synpredgate> ) { |
| <action> |
| } |
| <else> |
| <action> |
| <endif> |
| >> |
| |
| /** How to always execute an action even when backtracking */ |
| execForcedAction(action) ::= "<action>" |
| |
| // M I S C (properties, etc...) |
| |
| bitset(name, words64) ::= << |
| public static const <name>:BitSet = new BitSet([<words64:{it |<it>};separator=", ">]);<\n> |
| >> |
| |
| codeFileExtension() ::= ".as" |
| |
| true_value() ::= "true" |
| false_value() ::= "false" |