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module examples::staticFields::Checker

rascal-0.40.16
typepal-0.14.8

Usage​

import examples::staticFields::Checker;

Source code​

http://github.com/usethesource/typepal/src/examples/staticFields/Checker.rsc

Dependencies​

import examples::staticFields::Syntax;
extend analysis::typepal::TypePal;

data AType​

data AType  
     = intType()
     | strType()
     | structType(str name)
     ;

data IdRole​

data IdRole  
     = fieldId()
     | structId()
     ;

function prettyAType​

str prettyAType(intType()) = "int";

str prettyAType(strType()) = "str";

str prettyAType(structType(name)) = "struct <name>";

function staticFieldsGetTypeNamesAndRole​

tuple[list[str] typeNames, set[IdRole] idRoles] staticFieldsGetTypeNamesAndRole(structType(str name)){
    return <[name], {structId()}>;
}

default tuple[list[str] typeNames, set[IdRole] idRoles] staticFieldsGetTypeNamesAndRole(AType t){
    return <[], {}>;
}

function staticFieldsGetTypeInNamelessType​

AType staticFieldsGetTypeInNamelessType(AType containerType, Tree selector, loc _, Solver s){
    if(!(containerType == strType() && "<selector>" == "length")){
        s.report(error(selector, "Undefined field %q on %t", "<selector>", containerType));
    }
    return intType();
}

function staticFieldsConfig​

TypePalConfig staticFieldsConfig() =
    tconfig(getTypeNamesAndRole = staticFieldsGetTypeNamesAndRole,
            getTypeInNamelessType = staticFieldsGetTypeInNamelessType);

function collect​

void collect(current:(Declaration)`<Type typ> <Id id> = <Expression exp> ;`, Collector c) {
    c.define("<id>", variableId(), current, defType(typ));
    c.requireEqual(typ, exp, error(exp, "Incorrect initialization, expected %t, found %t", typ, exp));
    c.enterScope(current);
        collect(typ, exp, c);
    c.leaveScope(current);
}

void collect(current:(Declaration)`struct <Id name> { <{Field ","}* fields> };`, Collector c) {
    c.define("<name>", structId(), current, defType(structType("<name>"))); 
    c.enterScope(current);
        collect(fields, c);
    c.leaveScope(current);
}

void collect(current:(Field)`<Type typ> <Id name>`, Collector c) {
    c.define("<name>", fieldId(), current, defType(typ));
    collect(typ, c);
}

void collect(current:(Type)`int`, Collector c) {
    c.fact(current, intType());
}

void collect(current:(Type)`str`, Collector c) {
    c.fact(current, strType());
}

void collect(current:(Type)`<Id name>`, Collector c) {
    c.use(current, {structId()});
}

void collect(current:(Expression) `new <Id name>`, Collector c){
    c.use(name, {structId()});
    c.fact(current, structType("<name>"));
}

void collect(current:(Expression)`<Expression lhs> . <Id fieldName>`, Collector c) {
    c.useViaType(lhs, fieldName, {fieldId()});
    c.fact(current, fieldName);
    collect(lhs, c);
}

void collect(current:(Expression)`<Integer _>`, Collector c) {
    c.fact(current, intType());
}

void collect(current:(Expression)`<String _>`, Collector c) {
    c.fact(current, strType());
}

void collect(current:(Expression)`<Id use>`, Collector c) {
    c.use(use, {variableId()});
}