use of org.hl7.fhir.r4.utils.FHIRLexer.FHIRLexerException in project org.hl7.fhir.core by hapifhir.
the class FHIRPathEngine method parse.
/**
* Parse a path that is part of some other syntax
*
* @return
* @throws PathEngineException
* @throws Exception
*/
public ExpressionNode parse(FHIRLexer lexer) throws FHIRLexerException {
ExpressionNode result = parseExpression(lexer, true);
result.check();
return result;
}
use of org.hl7.fhir.r4.utils.FHIRLexer.FHIRLexerException in project org.hl7.fhir.core by hapifhir.
the class FHIRPathEngine method parse.
// --- public API -------------------------------------------------------
/**
* Parse a path for later use using execute
*
* @param path
* @return
* @throws PathEngineException
* @throws Exception
*/
public ExpressionNode parse(String path) throws FHIRLexerException {
FHIRLexer lexer = new FHIRLexer(path);
if (lexer.done())
throw lexer.error("Path cannot be empty");
ExpressionNode result = parseExpression(lexer, true);
if (!lexer.done())
throw lexer.error("Premature ExpressionNode termination at unexpected token \"" + lexer.getCurrent() + "\"");
result.check();
return result;
}
use of org.hl7.fhir.r4.utils.FHIRLexer.FHIRLexerException in project org.hl7.fhir.core by hapifhir.
the class FHIRPathEngine method check.
/**
* check that paths referred to in the ExpressionNode are valid
*
* xPathStartsWithValueRef is a hack work around for the fact that FHIR Path sometimes needs a different starting point than the xpath
*
* returns a list of the possible types that might be returned by executing the ExpressionNode against a particular context
*
* @param context - the logical type against which this path is applied
* @throws DefinitionException
* @throws PathEngineException
* @if the path is not valid
*/
public TypeDetails check(Object appContext, String resourceType, String context, ExpressionNode expr) throws FHIRLexerException, PathEngineException, DefinitionException {
// if context is a path that refers to a type, do that conversion now
TypeDetails types;
if (!context.contains("."))
types = new TypeDetails(CollectionStatus.SINGLETON, context);
else {
StructureDefinition sd = worker.fetchTypeDefinition(context.substring(0, context.indexOf('.')));
if (sd == null)
throw new PathEngineException("Unknown context " + context);
ElementDefinitionMatch ed = getElementDefinition(sd, context, true);
if (ed == null)
throw new PathEngineException("Unknown context element " + context);
if (ed.fixedType != null)
types = new TypeDetails(CollectionStatus.SINGLETON, ed.fixedType);
else if (ed.getDefinition().getType().isEmpty() || isAbstractType(ed.getDefinition().getType()))
types = new TypeDetails(CollectionStatus.SINGLETON, context);
else {
types = new TypeDetails(CollectionStatus.SINGLETON);
for (TypeRefComponent t : ed.getDefinition().getType()) types.addType(t.getCode());
}
}
return executeType(new ExecutionTypeContext(appContext, resourceType, types), types, expr, true);
}
use of org.hl7.fhir.r4.utils.FHIRLexer.FHIRLexerException in project org.hl7.fhir.core by hapifhir.
the class FHIRPathEngine method parsePartial.
/**
* Parse a path for later use using execute
*
* @param path
* @return
* @throws PathEngineException
* @throws Exception
*/
public ExpressionNodeWithOffset parsePartial(String path, int i) throws FHIRLexerException {
FHIRLexer lexer = new FHIRLexer(path, i);
if (lexer.done()) {
throw lexer.error("Path cannot be empty");
}
ExpressionNode result = parseExpression(lexer, true);
result.check();
return new ExpressionNodeWithOffset(lexer.getCurrentStart(), result);
}
use of org.hl7.fhir.r4.utils.FHIRLexer.FHIRLexerException in project org.hl7.fhir.core by hapifhir.
the class FHIRPathEngine method parseExpression.
private ExpressionNode parseExpression(FHIRLexer lexer, boolean proximal) throws FHIRLexerException {
ExpressionNode result = new ExpressionNode(lexer.nextId());
ExpressionNode wrapper = null;
SourceLocation c = lexer.getCurrentStartLocation();
result.setStart(lexer.getCurrentLocation());
// so we back correct for both +/- and as part of a numeric constant below.
if (Utilities.existsInList(lexer.getCurrent(), "-", "+")) {
wrapper = new ExpressionNode(lexer.nextId());
wrapper.setKind(Kind.Unary);
wrapper.setOperation(ExpressionNode.Operation.fromCode(lexer.take()));
wrapper.setStart(lexer.getCurrentLocation());
wrapper.setProximal(proximal);
}
if (lexer.isConstant()) {
boolean isString = lexer.isStringConstant();
if (!isString && (lexer.getCurrent().startsWith("-") || lexer.getCurrent().startsWith("+"))) {
// the grammar says that this is a unary operation; it affects the correct processing order of the inner operations
wrapper = new ExpressionNode(lexer.nextId());
wrapper.setKind(Kind.Unary);
wrapper.setOperation(ExpressionNode.Operation.fromCode(lexer.getCurrent().substring(0, 1)));
wrapper.setProximal(proximal);
wrapper.setStart(lexer.getCurrentLocation());
lexer.setCurrent(lexer.getCurrent().substring(1));
}
result.setConstant(processConstant(lexer));
result.setKind(Kind.Constant);
if (!isString && !lexer.done() && (result.getConstant() instanceof IntegerType || result.getConstant() instanceof DecimalType) && (lexer.isStringConstant() || lexer.hasToken("year", "years", "month", "months", "week", "weeks", "day", "days", "hour", "hours", "minute", "minutes", "second", "seconds", "millisecond", "milliseconds"))) {
// it's a quantity
String ucum = null;
String unit = null;
if (lexer.hasToken("year", "years", "month", "months", "week", "weeks", "day", "days", "hour", "hours", "minute", "minutes", "second", "seconds", "millisecond", "milliseconds")) {
String s = lexer.take();
unit = s;
if (s.equals("year") || s.equals("years")) {
// this is not the UCUM year
} else if (s.equals("month") || s.equals("months")) {
// this is not the UCUM month
} else if (s.equals("week") || s.equals("weeks")) {
ucum = "wk";
} else if (s.equals("day") || s.equals("days")) {
ucum = "d";
} else if (s.equals("hour") || s.equals("hours")) {
ucum = "h";
} else if (s.equals("minute") || s.equals("minutes")) {
ucum = "min";
} else if (s.equals("second") || s.equals("seconds")) {
ucum = "s";
} else {
// (s.equals("millisecond") || s.equals("milliseconds"))
ucum = "ms";
}
} else {
ucum = lexer.readConstant("units");
}
result.setConstant(new Quantity().setValue(new BigDecimal(result.getConstant().primitiveValue())).setUnit(unit).setSystem(ucum == null ? null : "http://unitsofmeasure.org").setCode(ucum));
}
result.setEnd(lexer.getCurrentLocation());
} else if ("(".equals(lexer.getCurrent())) {
lexer.next();
result.setKind(Kind.Group);
result.setGroup(parseExpression(lexer, true));
if (!")".equals(lexer.getCurrent())) {
throw lexer.error("Found " + lexer.getCurrent() + " expecting a \")\"");
}
result.setEnd(lexer.getCurrentLocation());
lexer.next();
} else {
if (!lexer.isToken() && !lexer.getCurrent().startsWith("`")) {
throw lexer.error("Found " + lexer.getCurrent() + " expecting a token name");
}
if (lexer.isFixedName()) {
result.setName(lexer.readFixedName("Path Name"));
} else {
result.setName(lexer.take());
}
result.setEnd(lexer.getCurrentLocation());
if (!result.checkName()) {
throw lexer.error("Found " + result.getName() + " expecting a valid token name");
}
if ("(".equals(lexer.getCurrent())) {
Function f = Function.fromCode(result.getName());
FunctionDetails details = null;
if (f == null) {
if (hostServices != null) {
details = hostServices.resolveFunction(result.getName());
}
if (details == null) {
throw lexer.error("The name " + result.getName() + " is not a valid function name");
}
f = Function.Custom;
}
result.setKind(Kind.Function);
result.setFunction(f);
lexer.next();
while (!")".equals(lexer.getCurrent())) {
result.getParameters().add(parseExpression(lexer, true));
if (",".equals(lexer.getCurrent())) {
lexer.next();
} else if (!")".equals(lexer.getCurrent())) {
throw lexer.error("The token " + lexer.getCurrent() + " is not expected here - either a \",\" or a \")\" expected");
}
}
result.setEnd(lexer.getCurrentLocation());
lexer.next();
checkParameters(lexer, c, result, details);
} else {
result.setKind(Kind.Name);
}
}
ExpressionNode focus = result;
if ("[".equals(lexer.getCurrent())) {
lexer.next();
ExpressionNode item = new ExpressionNode(lexer.nextId());
item.setKind(Kind.Function);
item.setFunction(ExpressionNode.Function.Item);
item.getParameters().add(parseExpression(lexer, true));
if (!lexer.getCurrent().equals("]")) {
throw lexer.error("The token " + lexer.getCurrent() + " is not expected here - a \"]\" expected");
}
lexer.next();
result.setInner(item);
focus = item;
}
if (".".equals(lexer.getCurrent())) {
lexer.next();
focus.setInner(parseExpression(lexer, false));
}
result.setProximal(proximal);
if (proximal) {
while (lexer.isOp()) {
focus.setOperation(ExpressionNode.Operation.fromCode(lexer.getCurrent()));
focus.setOpStart(lexer.getCurrentStartLocation());
focus.setOpEnd(lexer.getCurrentLocation());
lexer.next();
focus.setOpNext(parseExpression(lexer, false));
focus = focus.getOpNext();
}
result = organisePrecedence(lexer, result);
}
if (wrapper != null) {
wrapper.setOpNext(result);
result.setProximal(false);
result = wrapper;
}
return result;
}
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