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namespace VQDR.Expression {
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public abstract class Token : GLib.Object {
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/** Precision used to perform evaluation */
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public const int VALUES_PRECISION_DIGITS = 3;
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/** Precision factor used to convert raw values to actual ones */
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public const int VALUES_PRECISION_FACTOR = 1000;
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//public static int VALUES_PRECISION_FACTOR = (int)Math.pow(10, VALUES_PRECISION_DIGITS);
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/** Precision used to output values */
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public const int VALUES_OUTPUT_PRECISION_DIGITS = 2;
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/** Precision factor used to evaluate output */
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public const int VALUES_OUTPUT_PRECISION_FACTOR = 100;
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//public static int VALUES_OUTPUT_PRECISION_FACTOR = (int)Math.pow(10, VALUES_OUTPUT_PRECISION_DIGITS);
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/** Max size of a single token */
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public const int MAX_TOKEN_STRING_LENGTH = 64;
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/** Max size of an expression */
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public const int MAX_TOTAL_STRING_LENGTH = 200;
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/** Max iteration number for a token (function) */
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public const int MAX_TOKEN_ITERATIONS = 500;
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/** Max iteration number for the expression */
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public const int MAX_TOTAL_ITERATIONS = 5000;
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/* ************************************* */
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/* Operator precedence and associativity */
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/* ************************************* */
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/** Priority for assignment "=" operator */
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public const int PRIO_ASSIGNMENT = 0;
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/** Priority for conditional OR "||" operator */
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public const int PRIO_CONDITIONAL_OR = 2;
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/** Priority for conditional AND "&&" operator */
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public const int PRIO_CONDITIONAL_AND = 3;
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/** Priority for equality "==" and "!=" operators */
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public const int PRIO_EQUALITY = 4;
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/** Priority for comparison ">", "<", ">=", etc operators */
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public const int PRIO_COMPARISON = 5;
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/** Priority for addictive "+" and "-" operators */
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public const int PRIO_ADDICTIVE = 6;
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/** Priority for multiplicative "*" and "/" operators */
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public const int PRIO_MULTIPLICATIVE = 7;
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/** Priority for unary "+" and "-" and "!" operators */
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public const int PRIO_UNARY = 8;
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/** Priority for label assignment ":" operator */
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public const int PRIO_LABEL = 9;
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/** Priority for dice "d" operator */
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public const int PRIO_DICE = 10;
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/** Priority for functions */
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public const int PRIO_FUNCTION = 11;
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/** Priority for values */
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public const int PRIO_VALUE = 12;
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/** Generation to use to get the root with {@link #getParent} */
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protected const int ROOT_GENERATION = int.MAX;
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/* ********************************************************************** */
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* tells weather the token is right associative or not.
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public bool right_assosiative {get;set; default = false;}
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private int real_priority;
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/** The parent token of this token*/
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protected unowned Token? parent {protected get; protected set;}
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public virtual int priority {public get {
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return __get_priority ();
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} protected construct set {
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__set_priority (value);
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/** Starting position of the token in the expression */
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protected int position;
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/** The index of the next child */
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private int next_child;
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* The optional that this child represents.
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public int optional_num_child {public get; protected construct set;}
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/** The mandatory number of child this token can have */
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public int mandatory_num_child {public get; protected construct set;}
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* The maximum number of chidren
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* This is calculated at runtime as
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* ''optional_num_child + mandatory_num_child''.
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public int max_num_child {get {
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return optional_num_child + mandatory_num_child;
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/** all children of this token */
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private (unowned Token?)[] children;
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public long result_value {public get; protected set; default = 0;}
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public long result_max_value {public get; protected set; default = 0;}
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public long result_min_value {public get; protected set; default = 0;}
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public string result_string {public get; protected set; default = "";}
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// Valgrind says there is a memory leak here... But it's actually
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// GObject's constructor that is leaking.
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children = new Token[max_num_child];
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protected Token (int position) {
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this.position = position;
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* Reorders result_min_value and result_max_value, so that
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* result_max varue is the bigger of the two, and
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* result_min_value is the smaller.
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protected void reorder_max_min_values () {
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if (result_max_value < result_min_value) {
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long tmp = result_max_value;
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result_max_value = result_min_value;
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result_min_value = tmp;
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* Get a child token to this token.
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* Child positions are between 1 and max_num_child.
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* and index of 0 is illegal.
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public unowned Token? get_child (int index) requires (index > 0 && index <= max_num_child) {
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return children[index -1 ];
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* Set a child token to this this token.
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* Child positions are between 1 and max_num_child.
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* and index of 0 is illegal.
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public void set_child (int index, Token? child) requires (index > 0 && index <= max_num_child) {
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children[index - 1] = child;
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if (children[index - 1] != null) {
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children[index -1].parent = this;
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* is functionally equal to get_child (1);
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public Token get_left_child () {
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return get_child (1);
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* is functionally equal to get_child (2);
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public Token get_right_child () {
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return get_child (2);
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* is functionally equal to set_child (1, token);
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public void set_left_child (Token token) {
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set_child (1, token);
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* is functionally equal to set_child (2, token);
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public void set_right_child (Token token) {
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set_child (2, token);
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public void evaluate (Context instance) throws GLib.Error {
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evaluate_self (instance);
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* Evalutates current token tree.
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* This Method must evaluate the token subtree, and assign proper values to
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* the following properties:
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* @param instance The context to be used valfor this tree.
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* @throws GLib.Error an error if an error has orrured in the evaluation of the tree.
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protected abstract void evaluate_self (Context instance) throws GLib.Error;
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/* *********** IGNORE THE MESS I HAVE CREATED FRO MY SELF *************** */
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protected void __set_priority (int prio) {
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real_priority = prio;
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protected int __get_priority () {
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return real_priority;
added
removed
src/libvqdr/token.vala
