<?xml version="1.0" encoding="UTF-8" ?>
<!--
TODO docs
-->

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
           elementFormDefault="qualified">

    <xs:element name="tokenAutomaton" type="tokenAutomatonElementType"/>

    <xs:simpleType name="cppIdentifierType">
        <xs:restriction base="xs:string">
            <xs:pattern value="[a-zA-Z_][a-zA-Z0-9_]*"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="filenameType">
        <xs:restriction base="xs:string">
            <!-- At least one character. -->
            <xs:pattern value=".+"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="scopeType">
        <xs:restriction base="xs:string">
            <xs:enumeration value="protected"/>
            <xs:enumeration value="public"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:complexType name="tokenAutomatonElementType">
        <xs:sequence>
            <xs:element name="tokens" minOccurs="1" maxOccurs="1" type="tokensElementType">
                <!-- Each token name (the enum name), must be unique. -->
                <xs:unique name="tokenNames">
                    <xs:selector xpath="token"/>
                    <xs:field xpath="@name"/>
                </xs:unique>
                <!-- Each string must be unique, otherwise one string can map to two or
                     more enums. -->
                <xs:unique name="tokenValues">
                    <xs:selector xpath="token"/>
                    <xs:field xpath="."/>
                </xs:unique>
            </xs:element>
            <xs:element name="boilerplate" minOccurs="0" maxOccurs="1" type="boilerplateElementType"/>

        </xs:sequence>
        <xs:attribute name="className" type="cppIdentifierType"/>
        <xs:attribute name="includeGuardName" type="cppIdentifierType"/>
        <xs:attribute name="headerFile" type="filenameType" use="required"/>
        <xs:attribute name="namespace" type="cppIdentifierType" use="optional"/>
        <xs:attribute name="sourceFile" type="filenameType" use="required"/>
        <xs:attribute name="scope" type="scopeType"    use="required"/>
        <xs:attribute name="defaultToken" type="cppIdentifierType" use="required"/>
        <xs:attribute name="hasToString" type="xs:boolean" use="required"/>
        <xs:attribute name="tokenEnum" type="cppIdentifierType" use="required"/>
    </xs:complexType>

    <xs:complexType name="tokensElementType">
        <xs:sequence>
            <xs:element name="token" maxOccurs="unbounded" type="tokenElementType" minOccurs="1"/>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="tokenElementType">
        <xs:simpleContent>
            <xs:extension base="xs:string">
                <xs:attribute name="name" use="optional" type="cppIdentifierType"/>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>

    <xs:complexType name="boilerplateElementType">
        <xs:sequence>
            <xs:element name="prolog" maxOccurs="1" type="prologElementType" minOccurs="1"/>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="prologElementType">
        <xs:simpleContent>
            <xs:extension base="xs:string"/>
        </xs:simpleContent>
    </xs:complexType>

</xs:schema>
<!--
vim: et:ts=4:sw=4:sts=4
-->