Examples with VariableDeclaration com.google.template.soy.jssrc.dsl.VariableDeclaration used on opensource projects

Example 1 with VariableDeclaration

use of com.google.template.soy.jssrc.dsl.VariableDeclaration in project closure-templates by google.

the class GenJsCodeVisitor method handleForeachLoop.

/**
 * Example:
 *
 * <pre>
 *   {for $foo in $boo.foos}
 *     ...
 *   {/for}
 * </pre>
 *
 * might generate
 *
 * <pre>
 *   for (var foo2Index = 0; foo2Index &lt; foo2ListLen; foo2Index++) {
 *     var foo2Data = foo2List[foo2Index];
 *     ...
 *   }
 * </pre>
 */
private CodeChunk handleForeachLoop(ForNonemptyNode node, CodeChunk.WithValue limit, Function<CodeChunk.WithValue, CodeChunk.WithValue> getDataItemFunction) {
    // Build some local variable names.
    String varName = node.getVarName();
    String varPrefix = varName + node.getForNodeId();
    // TODO(user): A more consistent pattern for local variable management.
    String loopIndexName = varPrefix + "Index";
    String dataName = varPrefix + "Data";
    CodeChunk.WithValue loopIndex = id(loopIndexName);
    VariableDeclaration data = VariableDeclaration.builder(dataName).setRhs(getDataItemFunction.apply(loopIndex)).build();
    // Populate the local var translations with the translations from this node.
    templateTranslationContext.soyToJsVariableMappings().put(varName, id(dataName)).put(varName + "__isFirst", loopIndex.doubleEquals(number(0))).put(varName + "__isLast", loopIndex.doubleEquals(limit.minus(number(1)))).put(varName + "__index", loopIndex);
    // Generate the loop body.
    CodeChunk foreachBody = CodeChunk.statements(data, visitChildrenReturningCodeChunk(node));
    // Create the entire for block.
    return forLoop(loopIndexName, limit, foreachBody);
}

Example 2 with VariableDeclaration

use of com.google.template.soy.jssrc.dsl.VariableDeclaration in project closure-templates by google.

the class GenJsCodeVisitor method genParamTypeChecks.

/**
 * Generate code to verify the runtime types of the input params. Also typecasts the input
 * parameters and assigns them to local variables for use in the template.
 *
 * @param node the template node.
 */
@CheckReturnValue
protected CodeChunk genParamTypeChecks(TemplateNode node) {
    ImmutableList.Builder<CodeChunk> declarations = ImmutableList.builder();
    for (TemplateParam param : node.getAllParams()) {
        if (param.declLoc() != TemplateParam.DeclLoc.HEADER) {
            continue;
        }
        String paramName = param.name();
        SoyType paramType = param.type();
        CodeChunk.Generator generator = templateTranslationContext.codeGenerator();
        CodeChunk.WithValue paramChunk = TranslateExprNodeVisitor.genCodeForParamAccess(paramName, param.isInjected());
        JsType jsType = getJsType(paramType);
        // The opt_param.name value that will be type-tested.
        String paramAlias = genParamAlias(paramName);
        CodeChunk.WithValue coerced = jsType.getValueCoercion(paramChunk, generator);
        if (coerced != null) {
            // since we have coercion logic, dump into a temporary
            paramChunk = generator.declarationBuilder().setRhs(coerced).build().ref();
        }
        // The param value to assign
        CodeChunk.WithValue value;
        Optional<CodeChunk.WithValue> typeAssertion = jsType.getTypeAssertion(paramChunk, generator);
        // The type-cast expression.
        if (typeAssertion.isPresent()) {
            value = SOY_ASSERTS_ASSERT_TYPE.call(typeAssertion.get(), stringLiteral(paramName), paramChunk, stringLiteral(jsType.typeExpr()));
        } else {
            value = paramChunk;
        }
        VariableDeclaration.Builder declarationBuilder = VariableDeclaration.builder(paramAlias).setRhs(value).setGoogRequires(jsType.getGoogRequires());
        declarationBuilder.setJsDoc("/** @type {" + jsType.typeExpr() + "} */");
        VariableDeclaration declaration = declarationBuilder.build();
        declarations.add(declaration);
        templateTranslationContext.soyToJsVariableMappings().put(paramName, id(paramAlias));
    }
    return CodeChunk.statements(declarations.build());
}

Example 3 with VariableDeclaration

use of com.google.template.soy.jssrc.dsl.VariableDeclaration in project closure-templates by google.

the class AssistantForHtmlMsgs method generateMsgGroupCode.

/**
 * Returns a code chunk of idom instructions that output the contents of a translated message as
 * HTML. For example:
 *
 * <pre>
 *   {msg desc="Says hello to a person."}Hello {$name}!{/msg}
 * </pre>
 *
 * compiles to
 *
 * <pre>
 *   /** @desc Says hello to a person. *{@literal /}
 *   var MSG_EXTERNAL_6936162475751860807 = goog.getMsg(
 *       'Hello {$name}!',
 *       {'name': '\u00010\u0001'});
 *   var lastIndex_1153 = 0, partRe_1153 = /\x01\d+\x01/g, match_1153;
 *   do {
 *     match_1153 = partRe_1153.exec(MSG_EXTERNAL_6936162475751860807) || undefined;
 *     incrementalDom.text(goog.string.unescapeEntities(
 *         MSG_EXTERNAL_6936162475751860807.substring(
 *           lastIndex_1153, match_1153 && match_1153.index)));
 *     lastIndex_1153 = partRe_1153.lastIndex;
 *     switch (match_1153 && match_1153[0]) {
 *       case '\u00010\u0001':
 *         var dyn8 = opt_data.name;
 *         if (typeof dyn8 == 'function') dyn8();
 *         else if (dyn8 != null) incrementalDom.text(dyn8);
 *         break;
 *     }
 *   } while (match_1153);
 * </pre>
 *
 * Each interpolated MsgPlaceholderNode (either for HTML tags or for print statements) compiles to
 * a separate {@code case} statement.
 */
CodeChunk generateMsgGroupCode(MsgFallbackGroupNode node) {
    Preconditions.checkState(placeholderNames.isEmpty(), "This class is not reusable.");
    // Non-HTML {msg}s should be extracted into LetContentNodes and handled by jssrc.
    Preconditions.checkArgument(node.getHtmlContext() == HtmlContext.HTML_PCDATA, "AssistantForHtmlMsgs is only for HTML {msg}s.");
    // All of these helper variables must have uniquely-suffixed names because {msg}s can be nested.
    // It'd be nice to move this codegen to a Soy template...
    // The raw translated text, with placeholder placeholders.
    CodeChunk.WithValue translationVar = super.generateMsgGroupVariable(node);
    // If there are no placeholders, we don't need anything special (but we still need to unescape).
    if (placeholderNames.isEmpty()) {
        CodeChunk.WithValue unescape = GOOG_STRING_UNESCAPE_ENTITIES.call(translationVar);
        return INCREMENTAL_DOM_TEXT.call(unescape);
    }
    // it into a fresh variable.
    if (!translationVar.isCheap()) {
        translationVar = translationContext.codeGenerator().declarationBuilder().setRhs(translationVar).build().ref();
    }
    // Declare everything.
    // The mutable (tracking index of last match) regex to find the placeholder placeholders.
    VariableDeclaration regexVar = VariableDeclaration.builder("partRe_" + node.getId()).setRhs(CodeChunk.regexLiteral(PLACEHOLDER_REGEX)).build();
    // The current placeholder from the regex.
    VariableDeclaration matchVar = VariableDeclaration.builder("match_" + node.getId()).build();
    // The index of the end of the previous placeholder, where the next raw text run starts.
    VariableDeclaration lastIndexVar = VariableDeclaration.builder("lastIndex_" + node.getId()).setRhs(CodeChunk.number(0)).build();
    List<CodeChunk> doBody = new ArrayList<>();
    // match_XXX = partRe_XXX.exec(MSG_EXTERNAL_XXX) || undefined;
    doBody.add(matchVar.ref().assign(regexVar.ref().dotAccess("exec").call(translationVar).or(CodeChunk.id("undefined"), translationContext.codeGenerator())));
    // Replace null with undefined.  This is necessary to make substring() treat falsy as an omitted
    // parameter, so that it goes until the end of the string.  Otherwise, the non-numeric parameter
    // would be coerced to zero.
    // Emit the (possibly-empty) run of raw text since the last placeholder, until this placeholder,
    // or until the end of the source string.
    CodeChunk.WithValue endIndex = matchVar.ref().and(matchVar.ref().dotAccess("index"), translationContext.codeGenerator());
    CodeChunk.WithValue unescape = GOOG_STRING_UNESCAPE_ENTITIES.call(translationVar.dotAccess("substring").call(lastIndexVar.ref(), endIndex));
    doBody.add(INCREMENTAL_DOM_TEXT.call(unescape));
    doBody.add(lastIndexVar.ref().assign(regexVar.ref().dotAccess("lastIndex")));
    // switch (match_XXX && match_XXX[0]) { ... }
    SwitchBuilder switchBuilder = CodeChunk.switch_(matchVar.ref().and(matchVar.ref().bracketAccess(CodeChunk.number(0)), translationContext.codeGenerator()));
    for (Map.Entry<String, MsgPlaceholderNode> ph : placeholderNames.entrySet()) {
        switchBuilder.case_(CodeChunk.stringLiteral(ph.getKey()), master.visitForUseByAssistantsAsCodeChunk(ph.getValue()));
    }
    doBody.add(switchBuilder.build());
    return CodeChunk.statements(CodeChunk.statements(translationVar.initialStatements()), regexVar, lastIndexVar, matchVar, DoWhile.builder().setCondition(matchVar.ref()).setBody(CodeChunk.statements(doBody)).build());
}

Example 4 with VariableDeclaration

use of com.google.template.soy.jssrc.dsl.VariableDeclaration in project closure-templates by google.

the class GenIncrementalDomCodeVisitor method generateFunctionBody.

@Override
protected CodeChunk generateFunctionBody(TemplateNode node) {
    IncrementalDomCodeBuilder jsCodeBuilder = getJsCodeBuilder();
    boolean isTextTemplate = isTextContent(node.getContentKind());
    CodeChunk typeChecks = genParamTypeChecks(node);
    // the transformation.
    if (isTextTemplate) {
        // We do our own initialization below, so mark it as such.
        jsCodeBuilder.pushOutputVar("output").setOutputVarInited();
    }
    CodeChunk body = visitChildrenReturningCodeChunk(node);
    if (isTextTemplate) {
        VariableDeclaration declare = VariableDeclaration.builder("output").setRhs(LITERAL_EMPTY_STRING).build();
        jsCodeBuilder.popOutputVar();
        body = CodeChunk.statements(declare, body, return_(sanitize(declare.ref(), node.getContentKind())));
    }
    return CodeChunk.statements(typeChecks, body);
}