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// Generated by CoffeeScript 1.7.1
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(function() {
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var Pointer, VoidPointer, utils;
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utils = require('./utils');
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Pointer = (function() {
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function Pointer(offsetType, type, options) {
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var _base, _base1, _base2, _base3;
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this.offsetType = offsetType;
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this.type = type;
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this.options = options != null ? options : {};
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if (this.type === 'void') {
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this.type = null;
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}
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if ((_base = this.options).type == null) {
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_base.type = 'local';
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}
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if ((_base1 = this.options).allowNull == null) {
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_base1.allowNull = true;
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}
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if ((_base2 = this.options).nullValue == null) {
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_base2.nullValue = 0;
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}
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if ((_base3 = this.options).lazy == null) {
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_base3.lazy = false;
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}
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if (this.options.relativeTo) {
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this.relativeToGetter = new Function('ctx', "return ctx." + this.options.relativeTo);
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}
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}
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Pointer.prototype.decode = function(stream, ctx) {
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var c, decodeValue, offset, ptr, relative, val;
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offset = this.offsetType.decode(stream, ctx);
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if (offset === this.options.nullValue && this.options.allowNull) {
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return null;
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}
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relative = (function() {
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switch (this.options.type) {
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case 'local':
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return ctx._startOffset;
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case 'immediate':
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return stream.pos - this.offsetType.size();
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case 'parent':
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return ctx.parent._startOffset;
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default:
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c = ctx;
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while (c.parent) {
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c = c.parent;
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}
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return c._startOffset || 0;
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}
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}).call(this);
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if (this.options.relativeTo) {
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relative += this.relativeToGetter(ctx);
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}
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ptr = offset + relative;
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if (this.type != null) {
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val = null;
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decodeValue = (function(_this) {
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return function() {
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var pos;
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if (val != null) {
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return val;
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}
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pos = stream.pos;
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stream.pos = ptr;
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val = _this.type.decode(stream, ctx);
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stream.pos = pos;
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return val;
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};
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})(this);
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if (this.options.lazy) {
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return new utils.PropertyDescriptor({
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get: decodeValue
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});
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}
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return decodeValue();
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} else {
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return ptr;
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}
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};
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Pointer.prototype.size = function(val, ctx) {
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var parent, type;
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parent = ctx;
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switch (this.options.type) {
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case 'local':
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case 'immediate':
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break;
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case 'parent':
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ctx = ctx.parent;
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break;
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default:
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while (ctx.parent) {
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ctx = ctx.parent;
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}
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}
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type = this.type;
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if (type == null) {
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if (!(val instanceof VoidPointer)) {
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throw new Error("Must be a VoidPointer");
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}
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type = val.type;
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val = val.value;
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}
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if (val && ctx) {
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ctx.pointerSize += type.size(val, parent);
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}
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return this.offsetType.size();
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};
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Pointer.prototype.encode = function(stream, val, ctx) {
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var parent, relative, type;
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parent = ctx;
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if (val == null) {
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this.offsetType.encode(stream, this.options.nullValue);
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return;
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}
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switch (this.options.type) {
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case 'local':
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relative = ctx.startOffset;
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break;
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case 'immediate':
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relative = stream.pos + this.offsetType.size(val, parent);
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break;
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case 'parent':
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ctx = ctx.parent;
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relative = ctx.startOffset;
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break;
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default:
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relative = 0;
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while (ctx.parent) {
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ctx = ctx.parent;
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}
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}
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if (this.options.relativeTo) {
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relative += this.relativeToGetter(parent.val);
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}
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this.offsetType.encode(stream, ctx.pointerOffset - relative);
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type = this.type;
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if (type == null) {
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if (!(val instanceof VoidPointer)) {
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throw new Error("Must be a VoidPointer");
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}
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type = val.type;
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val = val.value;
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}
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ctx.pointers.push({
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type: type,
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val: val,
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parent: parent
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});
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return ctx.pointerOffset += type.size(val, parent);
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};
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return Pointer;
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})();
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VoidPointer = (function() {
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function VoidPointer(type, value) {
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this.type = type;
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this.value = value;
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}
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return VoidPointer;
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})();
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exports.Pointer = Pointer;
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exports.VoidPointer = VoidPointer;
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}).call(this);
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