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Example 1 with FHIRLexerException

use of org.hl7.fhir.r5.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;
}
Also used : ExpressionNode(org.hl7.fhir.dstu2.model.ExpressionNode)

Example 2 with FHIRLexerException

use of org.hl7.fhir.r5.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());
    SourceLocation c = lexer.getCurrentStartLocation();
    result.setStart(lexer.getCurrentLocation());
    // special:
    if (lexer.getCurrent().equals("-")) {
        lexer.take();
        lexer.setCurrent("-" + lexer.getCurrent());
    }
    if (lexer.getCurrent().equals("+")) {
        lexer.take();
        lexer.setCurrent("+" + lexer.getCurrent());
    }
    if (lexer.isConstant(false)) {
        checkConstant(lexer.getCurrent(), lexer);
        result.setConstant(lexer.take());
        result.setKind(Kind.Constant);
        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.getCurrent().startsWith("\""))
            result.setName(lexer.readConstant("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) {
                details = hostServices != null ? hostServices.resolveFunction(result.getName()) : null;
                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);
    }
    return result;
}
Also used : SourceLocation(org.hl7.fhir.dstu2.model.ExpressionNode.SourceLocation) Function(org.hl7.fhir.dstu2.model.ExpressionNode.Function) FunctionDetails(org.hl7.fhir.dstu2.utils.FHIRPathEngine.IEvaluationContext.FunctionDetails) ExpressionNode(org.hl7.fhir.dstu2.model.ExpressionNode)

Example 3 with FHIRLexerException

use of org.hl7.fhir.r5.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;
}
Also used : ExpressionNode(org.hl7.fhir.dstu2.model.ExpressionNode)

Example 4 with FHIRLexerException

use of org.hl7.fhir.r5.utils.FHIRLexer.FHIRLexerException in project org.hl7.fhir.core by hapifhir.

the class FHIRPathEngine method evaluate.

/**
 * evaluate a path and return the matching elements
 *
 * @param base - the object against which the path is being evaluated
 * @param path - the FHIR Path statement to use
 * @return
 * @throws PathEngineException
 * @throws FHIRLexerException
 * @
 * @
 */
public List<Base> evaluate(Object appContext, Resource resource, Base base, String path) throws PathEngineException, FHIRLexerException {
    ExpressionNode exp = parse(path);
    List<Base> list = new ArrayList<Base>();
    if (base != null)
        list.add(base);
    log = new StringBuilder();
    return execute(new ExecutionContext(appContext, resource, base, base), list, exp, true);
}
Also used : ExpressionNode(org.hl7.fhir.dstu2.model.ExpressionNode) ArrayList(java.util.ArrayList) Base(org.hl7.fhir.dstu2.model.Base)

Example 5 with FHIRLexerException

use of org.hl7.fhir.r5.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());
    SourceLocation c = lexer.getCurrentStartLocation();
    result.setStart(lexer.getCurrentLocation());
    // special:
    if (lexer.getCurrent().equals("-")) {
        lexer.take();
        lexer.setCurrent("-" + lexer.getCurrent());
    }
    if (lexer.isConstant(false)) {
        checkConstant(lexer.getCurrent(), lexer);
        result.setConstant(lexer.take());
        result.setKind(Kind.Constant);
        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.getCurrent().startsWith("\""))
            result.setName(lexer.readConstant("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) {
                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);
    }
    return result;
}
Also used : SourceLocation(org.hl7.fhir.dstu2016may.model.ExpressionNode.SourceLocation) Function(org.hl7.fhir.dstu2016may.model.ExpressionNode.Function) FunctionDetails(org.hl7.fhir.dstu2016may.utils.FHIRPathEngine.IEvaluationContext.FunctionDetails) ExpressionNode(org.hl7.fhir.dstu2016may.model.ExpressionNode)

Aggregations

CommaSeparatedStringBuilder (org.hl7.fhir.utilities.CommaSeparatedStringBuilder)9 ExpressionNode (org.hl7.fhir.r5.model.ExpressionNode)6 ExpressionNode (org.hl7.fhir.dstu2.model.ExpressionNode)5 ExpressionNode (org.hl7.fhir.r4.model.ExpressionNode)4 ExpressionNode (org.hl7.fhir.r4b.model.ExpressionNode)4 BigDecimal (java.math.BigDecimal)3 ArrayList (java.util.ArrayList)3 HashMap (java.util.HashMap)3 ExpressionNode (org.hl7.fhir.dstu2016may.model.ExpressionNode)3 ExpressionNode (org.hl7.fhir.dstu3.model.ExpressionNode)3 PathEngineException (org.hl7.fhir.exceptions.PathEngineException)3 SourceLocation (org.hl7.fhir.utilities.SourceLocation)3 Base (org.hl7.fhir.dstu2.model.Base)2 DefinitionException (org.hl7.fhir.exceptions.DefinitionException)2 FHIRException (org.hl7.fhir.exceptions.FHIRException)2 IOException (java.io.IOException)1 HashSet (java.util.HashSet)1 List (java.util.List)1 NotImplementedException (org.apache.commons.lang3.NotImplementedException)1 TypeRefComponent (org.hl7.fhir.dstu2.model.ElementDefinition.TypeRefComponent)1