Examples with FHIRLexer org.hl7.fhir.r4b.utils.FHIRLexer used on opensource projects

Example 26 with FHIRLexer

use of org.hl7.fhir.r4b.utils.FHIRLexer in project org.hl7.fhir.core by hapifhir.

the class StructureMapUtilities method parseUses.

private void parseUses(StructureMap result, FHIRLexer lexer) throws FHIRException {
    lexer.token("uses");
    StructureMapStructureComponent st = result.addStructure();
    st.setUrl(lexer.readConstant("url"));
    if (lexer.hasToken("alias")) {
        lexer.token("alias");
        st.setAlias(lexer.take());
    }
    lexer.token("as");
    st.setMode(StructureMapModelMode.fromCode(lexer.take()));
    lexer.skipToken(";");
    if (lexer.hasComment()) {
        st.setDocumentation(lexer.take().substring(2).trim());
    }
    lexer.skipComments();
}

Example 27 with FHIRLexer

use of org.hl7.fhir.r4b.utils.FHIRLexer in project org.hl7.fhir.core by hapifhir.

the class FHIRPathEngine method gatherPrecedence.

private ExpressionNode gatherPrecedence(FHIRLexer lexer, ExpressionNode start, EnumSet<Operation> ops) {
    assert (start.isProximal());
    // is there anything to do?
    boolean work = false;
    ExpressionNode focus = start.getOpNext();
    if (ops.contains(start.getOperation())) {
        while (focus != null && focus.getOperation() != null) {
            work = work || !ops.contains(focus.getOperation());
            focus = focus.getOpNext();
        }
    } else {
        while (focus != null && focus.getOperation() != null) {
            work = work || ops.contains(focus.getOperation());
            focus = focus.getOpNext();
        }
    }
    if (!work) {
        return start;
    }
    // entry point: tricky
    ExpressionNode group;
    if (ops.contains(start.getOperation())) {
        group = newGroup(lexer, start);
        group.setProximal(true);
        focus = start;
        start = group;
    } else {
        ExpressionNode node = start;
        focus = node.getOpNext();
        while (!ops.contains(focus.getOperation())) {
            node = focus;
            focus = focus.getOpNext();
        }
        group = newGroup(lexer, focus);
        node.setOpNext(group);
    }
    // focus points at the group.group
    do {
        // run until we find the end of the sequence
        while (ops.contains(focus.getOperation())) {
            focus = focus.getOpNext();
        }
        if (focus.getOperation() != null) {
            group.setOperation(focus.getOperation());
            group.setOpNext(focus.getOpNext());
            focus.setOperation(null);
            focus.setOpNext(null);
            // now look for another sequence, and start it
            ExpressionNode node = group;
            focus = group.getOpNext();
            if (focus != null) {
                while (focus != null && !ops.contains(focus.getOperation())) {
                    node = focus;
                    focus = focus.getOpNext();
                }
                if (focus != null) {
                    // && (focus.Operation in Ops) - must be true
                    group = newGroup(lexer, focus);
                    node.setOpNext(group);
                }
            }
        }
    } while (focus != null && focus.getOperation() != null);
    return start;
}

Example 28 with FHIRLexer

use of org.hl7.fhir.r4b.utils.FHIRLexer in project org.hl7.fhir.core by hapifhir.

the class FHIRPathEngine method parse.

public ExpressionNode parse(String path, String name) throws FHIRLexerException {
    FHIRLexer lexer = new FHIRLexer(path, name);
    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;
}

Example 29 with FHIRLexer

use of org.hl7.fhir.r4b.utils.FHIRLexer 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;
}

Example 30 with FHIRLexer

use of org.hl7.fhir.r4b.utils.FHIRLexer 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);
}