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[llvm][mustache] Refactor template rendering #159189

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Sep 30, 2025
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[llvm][mustache] Refactor template rendering #159189

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132 changes: 80 additions & 52 deletions llvm/lib/Support/Mustache.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -180,6 +180,14 @@ class ASTNode {

const llvm::json::Value *findContext();

void renderRoot(const json::Value &CurrentCtx, raw_ostream &OS);
void renderText(raw_ostream &OS);
void renderPartial(const json::Value &CurrentCtx, raw_ostream &OS);
void renderVariable(const json::Value &CurrentCtx, raw_ostream &OS);
void renderUnescapeVariable(const json::Value &CurrentCtx, raw_ostream &OS);
void renderSection(const json::Value &CurrentCtx, raw_ostream &OS);
void renderInvertSection(const json::Value &CurrentCtx, raw_ostream &OS);

StringMap<AstPtr> &Partials;
StringMap<Lambda> &Lambdas;
StringMap<SectionLambda> &SectionLambdas;
Expand Down Expand Up @@ -686,76 +694,96 @@ static void toMustacheString(const json::Value &Data, raw_ostream &OS) {
}
}

void ASTNode::renderRoot(const json::Value &CurrentCtx, raw_ostream &OS) {
renderChild(CurrentCtx, OS);
}

void ASTNode::renderText(raw_ostream &OS) { OS << Body; }

void ASTNode::renderPartial(const json::Value &CurrentCtx, raw_ostream &OS) {
auto Partial = Partials.find(AccessorValue[0]);
if (Partial != Partials.end())
renderPartial(CurrentCtx, OS, Partial->getValue().get());
}

void ASTNode::renderVariable(const json::Value &CurrentCtx, raw_ostream &OS) {
auto Lambda = Lambdas.find(AccessorValue[0]);
if (Lambda != Lambdas.end()) {
renderLambdas(CurrentCtx, OS, Lambda->getValue());
} else if (const json::Value *ContextPtr = findContext()) {
EscapeStringStream ES(OS, Escapes);
toMustacheString(*ContextPtr, ES);
}
}

void ASTNode::renderUnescapeVariable(const json::Value &CurrentCtx,
raw_ostream &OS) {
auto Lambda = Lambdas.find(AccessorValue[0]);
if (Lambda != Lambdas.end()) {
renderLambdas(CurrentCtx, OS, Lambda->getValue());
} else if (const json::Value *ContextPtr = findContext()) {
toMustacheString(*ContextPtr, OS);
}
}

void ASTNode::renderSection(const json::Value &CurrentCtx, raw_ostream &OS) {
auto SectionLambda = SectionLambdas.find(AccessorValue[0]);
if (SectionLambda != SectionLambdas.end()) {
renderSectionLambdas(CurrentCtx, OS, SectionLambda->getValue());
return;
}

const json::Value *ContextPtr = findContext();
if (isContextFalsey(ContextPtr))
return;

if (const json::Array *Arr = ContextPtr->getAsArray()) {
for (const json::Value &V : *Arr)
renderChild(V, OS);
return;
}
renderChild(*ContextPtr, OS);
}

void ASTNode::renderInvertSection(const json::Value &CurrentCtx,
raw_ostream &OS) {
bool IsLambda = SectionLambdas.contains(AccessorValue[0]);
const json::Value *ContextPtr = findContext();
if (isContextFalsey(ContextPtr) && !IsLambda) {
renderChild(CurrentCtx, OS);
}
}

void ASTNode::render(const json::Value &CurrentCtx, raw_ostream &OS) {
if (Ty != Root && Ty != Text && AccessorValue.empty())
return;
// Set the parent context to the incoming context so that we
// can walk up the context tree correctly in findContext().
ParentContext = &CurrentCtx;
const json::Value *ContextPtr = Ty == Root ? ParentContext : findContext();

switch (Ty) {
case Root:
renderChild(CurrentCtx, OS);
renderRoot(CurrentCtx, OS);
return;
case Text:
OS << Body;
renderText(OS);
return;
case Partial: {
auto Partial = Partials.find(AccessorValue[0]);
if (Partial != Partials.end())
renderPartial(CurrentCtx, OS, Partial->getValue().get());
case Partial:
renderPartial(CurrentCtx, OS);
return;
}
case Variable: {
auto Lambda = Lambdas.find(AccessorValue[0]);
if (Lambda != Lambdas.end()) {
renderLambdas(CurrentCtx, OS, Lambda->getValue());
} else if (ContextPtr) {
EscapeStringStream ES(OS, Escapes);
toMustacheString(*ContextPtr, ES);
}
case Variable:
renderVariable(CurrentCtx, OS);
return;
}
case UnescapeVariable: {
auto Lambda = Lambdas.find(AccessorValue[0]);
if (Lambda != Lambdas.end()) {
renderLambdas(CurrentCtx, OS, Lambda->getValue());
} else if (ContextPtr) {
toMustacheString(*ContextPtr, OS);
}
case UnescapeVariable:
renderUnescapeVariable(CurrentCtx, OS);
return;
}
case Section: {
auto SectionLambda = SectionLambdas.find(AccessorValue[0]);
bool IsLambda = SectionLambda != SectionLambdas.end();

if (IsLambda) {
renderSectionLambdas(CurrentCtx, OS, SectionLambda->getValue());
return;
}

if (isContextFalsey(ContextPtr))
return;

if (const json::Array *Arr = ContextPtr->getAsArray()) {
for (const json::Value &V : *Arr)
renderChild(V, OS);
return;
}
renderChild(*ContextPtr, OS);
case Section:
renderSection(CurrentCtx, OS);
return;
}
case InvertSection: {
bool IsLambda = SectionLambdas.contains(AccessorValue[0]);
if (isContextFalsey(ContextPtr) && !IsLambda) {
// The context for the children remains unchanged from the parent's, so
// we pass this node's original incoming context.
renderChild(CurrentCtx, OS);
}
case InvertSection:
renderInvertSection(CurrentCtx, OS);
return;
}
}
llvm_unreachable("Invalid ASTNode type");
}

Expand Down