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Example 1 with StarBlock

use of org.antlr.v4.codegen.model.StarBlock in project antlr4 by antlr.

the class ParserFactory method getComplexEBNFBlock.

@Override
public Choice getComplexEBNFBlock(GrammarAST ebnfRoot, List<CodeBlockForAlt> alts) {
    int ebnf = 0;
    if (ebnfRoot != null)
        ebnf = ebnfRoot.getType();
    Choice c = null;
    switch(ebnf) {
        case ANTLRParser.OPTIONAL:
            c = new OptionalBlock(this, ebnfRoot, alts);
            break;
        case ANTLRParser.CLOSURE:
            c = new StarBlock(this, ebnfRoot, alts);
            break;
        case ANTLRParser.POSITIVE_CLOSURE:
            c = new PlusBlock(this, ebnfRoot, alts);
            break;
    }
    return c;
}
Also used : Choice(org.antlr.v4.codegen.model.Choice) StarBlock(org.antlr.v4.codegen.model.StarBlock) LL1OptionalBlock(org.antlr.v4.codegen.model.LL1OptionalBlock) OptionalBlock(org.antlr.v4.codegen.model.OptionalBlock) PlusBlock(org.antlr.v4.codegen.model.PlusBlock)

Example 2 with StarBlock

use of org.antlr.v4.codegen.model.StarBlock in project antlr4 by antlr.

the class OutputModelController method buildLeftRecursiveRuleFunction.

public void buildLeftRecursiveRuleFunction(LeftRecursiveRule r, LeftRecursiveRuleFunction function) {
    buildNormalRuleFunction(r, function);
    // now inject code to start alts
    CodeGenerator gen = delegate.getGenerator();
    STGroup codegenTemplates = gen.getTemplates();
    // pick out alt(s) for primaries
    CodeBlockForOuterMostAlt outerAlt = (CodeBlockForOuterMostAlt) function.code.get(0);
    List<CodeBlockForAlt> primaryAltsCode = new ArrayList<CodeBlockForAlt>();
    SrcOp primaryStuff = outerAlt.ops.get(0);
    if (primaryStuff instanceof Choice) {
        Choice primaryAltBlock = (Choice) primaryStuff;
        primaryAltsCode.addAll(primaryAltBlock.alts);
    } else {
        // just a single alt I guess; no block
        primaryAltsCode.add((CodeBlockForAlt) primaryStuff);
    }
    // pick out alt(s) for op alts
    StarBlock opAltStarBlock = (StarBlock) outerAlt.ops.get(1);
    CodeBlockForAlt altForOpAltBlock = opAltStarBlock.alts.get(0);
    List<CodeBlockForAlt> opAltsCode = new ArrayList<CodeBlockForAlt>();
    SrcOp opStuff = altForOpAltBlock.ops.get(0);
    if (opStuff instanceof AltBlock) {
        AltBlock opAltBlock = (AltBlock) opStuff;
        opAltsCode.addAll(opAltBlock.alts);
    } else {
        // just a single alt I guess; no block
        opAltsCode.add((CodeBlockForAlt) opStuff);
    }
    // Insert code in front of each primary alt to create specialized ctx if there was a label
    for (int i = 0; i < primaryAltsCode.size(); i++) {
        LeftRecursiveRuleAltInfo altInfo = r.recPrimaryAlts.get(i);
        if (altInfo.altLabel == null)
            continue;
        ST altActionST = codegenTemplates.getInstanceOf("recRuleReplaceContext");
        altActionST.add("ctxName", Utils.capitalize(altInfo.altLabel));
        Action altAction = new Action(delegate, function.altLabelCtxs.get(altInfo.altLabel), altActionST);
        CodeBlockForAlt alt = primaryAltsCode.get(i);
        alt.insertOp(0, altAction);
    }
    // Insert code to set ctx.stop after primary block and before op * loop
    ST setStopTokenAST = codegenTemplates.getInstanceOf("recRuleSetStopToken");
    Action setStopTokenAction = new Action(delegate, function.ruleCtx, setStopTokenAST);
    outerAlt.insertOp(1, setStopTokenAction);
    // Insert code to set _prevctx at start of * loop
    ST setPrevCtx = codegenTemplates.getInstanceOf("recRuleSetPrevCtx");
    Action setPrevCtxAction = new Action(delegate, function.ruleCtx, setPrevCtx);
    opAltStarBlock.addIterationOp(setPrevCtxAction);
    // Insert code in front of each op alt to create specialized ctx if there was an alt label
    for (int i = 0; i < opAltsCode.size(); i++) {
        ST altActionST;
        LeftRecursiveRuleAltInfo altInfo = r.recOpAlts.getElement(i);
        String templateName;
        if (altInfo.altLabel != null) {
            templateName = "recRuleLabeledAltStartAction";
            altActionST = codegenTemplates.getInstanceOf(templateName);
            altActionST.add("currentAltLabel", altInfo.altLabel);
        } else {
            templateName = "recRuleAltStartAction";
            altActionST = codegenTemplates.getInstanceOf(templateName);
            altActionST.add("ctxName", Utils.capitalize(r.name));
        }
        altActionST.add("ruleName", r.name);
        // add label of any lr ref we deleted
        altActionST.add("label", altInfo.leftRecursiveRuleRefLabel);
        if (altActionST.impl.formalArguments.containsKey("isListLabel")) {
            altActionST.add("isListLabel", altInfo.isListLabel);
        } else if (altInfo.isListLabel) {
            delegate.getGenerator().tool.errMgr.toolError(ErrorType.CODE_TEMPLATE_ARG_ISSUE, templateName, "isListLabel");
        }
        Action altAction = new Action(delegate, function.altLabelCtxs.get(altInfo.altLabel), altActionST);
        CodeBlockForAlt alt = opAltsCode.get(i);
        alt.insertOp(0, altAction);
    }
}
Also used : GrammarAST(org.antlr.v4.tool.ast.GrammarAST) ActionAST(org.antlr.v4.tool.ast.ActionAST) BlockAST(org.antlr.v4.tool.ast.BlockAST) ST(org.stringtemplate.v4.ST) PredAST(org.antlr.v4.tool.ast.PredAST) Action(org.antlr.v4.codegen.model.Action) SrcOp(org.antlr.v4.codegen.model.SrcOp) Choice(org.antlr.v4.codegen.model.Choice) STGroup(org.stringtemplate.v4.STGroup) ArrayList(java.util.ArrayList) StarBlock(org.antlr.v4.codegen.model.StarBlock) CodeBlockForOuterMostAlt(org.antlr.v4.codegen.model.CodeBlockForOuterMostAlt) CodeBlockForAlt(org.antlr.v4.codegen.model.CodeBlockForAlt) AltBlock(org.antlr.v4.codegen.model.AltBlock) LeftRecursiveRuleAltInfo(org.antlr.v4.analysis.LeftRecursiveRuleAltInfo)

Aggregations

Choice (org.antlr.v4.codegen.model.Choice)2 StarBlock (org.antlr.v4.codegen.model.StarBlock)2 ArrayList (java.util.ArrayList)1 LeftRecursiveRuleAltInfo (org.antlr.v4.analysis.LeftRecursiveRuleAltInfo)1 Action (org.antlr.v4.codegen.model.Action)1 AltBlock (org.antlr.v4.codegen.model.AltBlock)1 CodeBlockForAlt (org.antlr.v4.codegen.model.CodeBlockForAlt)1 CodeBlockForOuterMostAlt (org.antlr.v4.codegen.model.CodeBlockForOuterMostAlt)1 LL1OptionalBlock (org.antlr.v4.codegen.model.LL1OptionalBlock)1 OptionalBlock (org.antlr.v4.codegen.model.OptionalBlock)1 PlusBlock (org.antlr.v4.codegen.model.PlusBlock)1 SrcOp (org.antlr.v4.codegen.model.SrcOp)1 ActionAST (org.antlr.v4.tool.ast.ActionAST)1 BlockAST (org.antlr.v4.tool.ast.BlockAST)1 GrammarAST (org.antlr.v4.tool.ast.GrammarAST)1 PredAST (org.antlr.v4.tool.ast.PredAST)1 ST (org.stringtemplate.v4.ST)1 STGroup (org.stringtemplate.v4.STGroup)1