complete redesign: use nodejs on server instead of php - documentation to be updated

nodejs/node_modules/stylus/lib/nodes/unit.js

@@ -0,0 +1,214 @@
+
+/*!
+ * Stylus - Unit
+ * Copyright (c) Automattic <developer.wordpress.com>
+ * MIT Licensed
+ */
+
+/**
+ * Module dependencies.
+ */
+
+var Node = require('./node')
+  , nodes = require('./');
+
+/**
+ * Unit conversion table.
+ */
+
+var FACTOR_TABLE = {
+  'mm': {val: 1, label: 'mm'},
+  'cm': {val: 10, label: 'mm'},
+  'in': {val: 25.4, label: 'mm'},
+  'pt': {val: 25.4/72, label: 'mm'},
+  'ms': {val: 1, label: 'ms'},
+  's': {val: 1000, label: 'ms'},
+  'Hz': {val: 1, label: 'Hz'},
+  'kHz': {val: 1000, label: 'Hz'}
+};
+
+/**
+ * Initialize a new `Unit` with the given `val` and unit `type`
+ * such as "px", "pt", "in", etc.
+ *
+ * @param {String} val
+ * @param {String} type
+ * @api public
+ */
+
+var Unit = module.exports = function Unit(val, type){
+  Node.call(this);
+  this.val = val;
+  this.type = type;
+};
+
+/**
+ * Inherit from `Node.prototype`.
+ */
+
+Unit.prototype.__proto__ = Node.prototype;
+
+/**
+ * Return Boolean based on the unit value.
+ *
+ * @return {Boolean}
+ * @api public
+ */
+
+Unit.prototype.toBoolean = function(){
+  return nodes.Boolean(this.type
+      ? true
+      : this.val);
+};
+
+/**
+ * Return unit string.
+ *
+ * @return {String}
+ * @api public
+ */
+
+Unit.prototype.toString = function(){
+  return this.val + (this.type || '');
+};
+
+/**
+ * Return a clone of this node.
+ *
+ * @return {Node}
+ * @api public
+ */
+
+Unit.prototype.clone = function(){
+  var clone = new Unit(this.val, this.type);
+  clone.lineno = this.lineno;
+  clone.column = this.column;
+  clone.filename = this.filename;
+  return clone;
+};
+
+/**
+ * Return a JSON representation of this node.
+ *
+ * @return {Object}
+ * @api public
+ */
+
+Unit.prototype.toJSON = function(){
+  return {
+    __type: 'Unit',
+    val: this.val,
+    type: this.type,
+    lineno: this.lineno,
+    column: this.column,
+    filename: this.filename
+  };
+};
+
+/**
+ * Operate on `right` with the given `op`.
+ *
+ * @param {String} op
+ * @param {Node} right
+ * @return {Node}
+ * @api public
+ */
+
+Unit.prototype.operate = function(op, right){
+  var type = this.type || right.first.type;
+
+  // swap color
+  if ('rgba' == right.nodeName || 'hsla' == right.nodeName) {
+    return right.operate(op, this);
+  }
+
+  // operate
+  if (this.shouldCoerce(op)) {
+    right = right.first;
+    // percentages
+    if ('%' != this.type && ('-' == op || '+' == op) && '%' == right.type) {
+      right = new Unit(this.val * (right.val / 100), '%');
+    } else {
+      right = this.coerce(right);
+    }
+
+    switch (op) {
+      case '-':
+        return new Unit(this.val - right.val, type);
+      case '+':
+        // keyframes interpolation
+        type = type || (right.type == '%' && right.type);
+        return new Unit(this.val + right.val, type);
+      case '/':
+        return new Unit(this.val / right.val, type);
+      case '*':
+        return new Unit(this.val * right.val, type);
+      case '%':
+        return new Unit(this.val % right.val, type);
+      case '**':
+        return new Unit(Math.pow(this.val, right.val), type);
+      case '..':
+      case '...':
+        var start = this.val
+          , end = right.val
+          , expr = new nodes.Expression
+          , inclusive = '..' == op;
+        if (start < end) {
+          do {
+            expr.push(new nodes.Unit(start));
+          } while (inclusive ? ++start <= end : ++start < end);
+        } else {
+          do {
+            expr.push(new nodes.Unit(start));
+          } while (inclusive ? --start >= end : --start > end);
+        }
+        return expr;
+    }
+  }
+
+  return Node.prototype.operate.call(this, op, right);
+};
+
+/**
+ * Coerce `other` unit to the same type as `this` unit.
+ *
+ * Supports:
+ *
+ *    mm -> cm | in
+ *    cm -> mm | in
+ *    in -> mm | cm
+ *
+ *    ms -> s
+ *    s  -> ms
+ *
+ *    Hz  -> kHz
+ *    kHz -> Hz
+ *
+ * @param {Unit} other
+ * @return {Unit}
+ * @api public
+ */
+
+Unit.prototype.coerce = function(other){
+  if ('unit' == other.nodeName) {
+    var a = this
+      , b = other
+      , factorA = FACTOR_TABLE[a.type]
+      , factorB = FACTOR_TABLE[b.type];
+
+    if (factorA && factorB && (factorA.label == factorB.label)) {
+      var bVal = b.val * (factorB.val / factorA.val);
+      return new nodes.Unit(bVal, a.type);
+    } else {
+      return new nodes.Unit(b.val, a.type);
+    }
+  } else if ('string' == other.nodeName) {
+    // keyframes interpolation
+    if ('%' == other.val) return new nodes.Unit(0, '%');
+    var val = parseFloat(other.val);
+    if (isNaN(val)) Node.prototype.coerce.call(this, other);
+    return new nodes.Unit(val);
+  } else {
+    return Node.prototype.coerce.call(this, other);
+  }
+};