Fixes #1880 - Adds two new math modes and deprecates strictMath

bin/lessc

@@ -4,6 +4,7 @@ var path = require('path'),
     fs = require('../lib/less-node/fs'),
     os = require('os'),
     utils = require('../lib/less/utils'),
+    MATH = require('../lib/less/math-constants'),
     errno,
     mkdirp;
 
@@ -481,8 +482,17 @@ function processPluginQueue() {
                 break;
             case 'sm':
             case 'strict-math':
+                console.warning('--strict-math is deprecated. Use --math=strict');
                 if (checkArgFunc(arg, match[2])) {
-                    options.strictMath = checkBooleanArg(match[2]);
+                    if (checkBooleanArg(match[2])) {
+                        options.math = MATH.STRICT_LEGACY;
+                    }
+                }
+                break;
+            case 'm':
+            case 'math':
+                if (checkArgFunc(arg, match[2])) {
+                    options.math = match[2];
                 }
                 break;
             case 'su':

lib/less-browser/add-default-options.js

@@ -42,8 +42,4 @@ module.exports = function(window, options) {
     if (options.onReady === undefined) {
         options.onReady = true;
     }
-
-    // TODO: deprecate and remove 'inlineJavaScript' thing - where it came from at all?
-    options.javascriptEnabled = (options.javascriptEnabled || options.inlineJavaScript) ? true : false;
-
 };

lib/less-node/lessc-helper.js

@@ -48,9 +48,13 @@ var lessc_helper = {
         console.log('  -rp, --rootpath=URL          Sets rootpath for url rewriting in relative imports and urls');
         console.log('                               Works with or without the relative-urls option.');
         console.log('  -ru, --relative-urls         Re-writes relative urls to the base less file.');
-        console.log('  -sm=on|off                   Turns on or off strict math, where in strict mode, math.');
-        console.log('  --strict-math=on|off         Requires brackets. This option may default to on and then');
-        console.log('                               be removed in the future.');
+        console.log('');
+        console.log('  -m=, --math=');
+        console.log('     always                    Less will eagerly perform math operations always.');
+        console.log('     parens-division           Math performed except for division (/) operator');
+        console.log('     parens | strict           Math only performed inside parentheses');
+        console.log('     strict-legacy             Parens required in very strict terms (legacy --strict-math)');
+        console.log('');
         console.log('  -su=on|off                   Allows mixed units, e.g. 1px+1em or 1px*1px which have units');
         console.log('  --strict-units=on|off        that cannot be represented.');
         console.log('  --global-var=\'VAR=VALUE\'     Defines a variable that can be referenced by the file.');
@@ -64,6 +68,9 @@ var lessc_helper = {
         console.log('                               or --clean-css="advanced"');
         console.log('');
         console.log('-------------------------- Deprecated ----------------');
+        console.log('  -sm=on|off               Legacy parens-only math. Use --math');
+        console.log('  --strict-math=on|off     ');
+        console.log('');
         console.log('  --line-numbers=TYPE      Outputs filename and line numbers.');
         console.log('                           TYPE can be either \'comments\', which will output');
         console.log('                           the debug info within comments, \'mediaquery\'');

lib/less/contexts.js

@@ -1,5 +1,6 @@
 var contexts = {};
 module.exports = contexts;
+var MATH = require('./math-constants');
 
 var copyFromOriginal = function copyFromOriginal(original, destination, propertiesToCopy) {
     if (!original) { return; }
@@ -43,7 +44,7 @@ var evalCopyProperties = [
     'paths',             // additional include paths
     'compress',          // whether to compress
     'ieCompat',          // whether to enforce IE compatibility (IE8 data-uri)
-    'strictMath',        // whether math has to be within parenthesis
+    'math',              // whether math has to be within parenthesis
     'strictUnits',       // whether units need to evaluate correctly
     'sourceMap',         // whether to output a source map
     'importMultiple',    // whether we are currently importing multiple copies
@@ -90,11 +91,17 @@ contexts.Eval.prototype.outOfParenthesis = function () {
 
 contexts.Eval.prototype.inCalc = false;
 contexts.Eval.prototype.mathOn = true;
-contexts.Eval.prototype.isMathOn = function () {
+contexts.Eval.prototype.isMathOn = function (op) {
     if (!this.mathOn) {
         return false;
     }
-    return this.strictMath ? (this.parensStack && this.parensStack.length) : true;
+    if (op === '/' && this.math !== MATH.ALWAYS && (!this.parensStack || !this.parensStack.length)) {
+        return false;
+    }
+    if (this.math > MATH.PARENS_DIVISION) {
+        return this.parensStack && this.parensStack.length;
+    }
+    return true;
 };
 
 contexts.Eval.prototype.isPathRelative = function (path) {

lib/less/default-options.js

@@ -1,10 +1,13 @@
 // Export a new default each time
 module.exports = function() {
     return {
+        /* Inline Javascript - @plugin still allowed */
+        javascriptEnabled: false,
+
         /* Outputs a makefile import dependency list to stdout. */
         depends: false,
 
-        /* Compress using less built-in compression. 
+        /* (DEPRECATED) Compress using less built-in compression. 
          * This does an okay job but does not utilise all the tricks of 
          * dedicated css compression. */
         compress: false,
@@ -44,8 +47,13 @@ module.exports = function() {
         /* Compatibility with IE8. Used for limiting data-uri length */
         ieCompat: false,  // true until 3.0
 
-        /* Without this option on, Less will try and process all math in your css */
-        strictMath: false,
+        /* How to process math 
+         *   0 always           - eagerly try to solve all operations
+         *   1 parens-division  - require parens for division "/"
+         *   2 parens | strict  - require parens for all operations
+         *   3 strict-legacy    - legacy strict behavior (super-strict)
+         */
+        math: 0,
 
         /* Without this option, less attempts to guess at the output unit when it does maths. */
         strictUnits: false,

lib/less/math-constants.js

@@ -0,0 +1,6 @@
+module.exports = {
+    ALWAYS: 0,
+    PARENS_DIVISION: 1,
+    PARENS: 2,
+    STRICT_LEGACY: 3
+};

lib/less/parse.js

@@ -10,10 +10,10 @@ module.exports = function(environment, ParseTree, ImportManager) {
 
         if (typeof options === 'function') {
             callback = options;
-            options = utils.defaults(this.options, {});
+            options = utils.copyOptions(this.options, {});
         }
         else {
-            options = utils.defaults(this.options, options || {});
+            options = utils.copyOptions(this.options, options || {});
         }
 
         if (!callback) {

lib/less/parser/parser.js

@@ -1920,7 +1920,7 @@ var Parser = function Parser(context, imports, fileInfo) {
 
                         parserInput.save();
 
-                        op = parserInput.$char('/') || parserInput.$char('*');
+                        op = parserInput.$char('/') || parserInput.$char('*') || parserInput.$str('./');
 
                         if (!op) { parserInput.forget(); break; }
 

lib/less/render.js

@@ -5,10 +5,10 @@ module.exports = function(environment, ParseTree, ImportManager) {
     var render = function (input, options, callback) {
         if (typeof options === 'function') {
             callback = options;
-            options = utils.defaults(this.options, {});
+            options = utils.copyOptions(this.options, {});
         }
         else {
-            options = utils.defaults(this.options, options || {});
+            options = utils.copyOptions(this.options, options || {});
         }
 
         if (!callback) {

lib/less/tree/declaration.js

@@ -1,7 +1,8 @@
 var Node = require('./node'),
     Value = require('./value'),
     Keyword = require('./keyword'),
-    Anonymous = require('./anonymous');
+    Anonymous = require('./anonymous'),
+    MATH = require('../math-constants');
 
 var Declaration = function (name, value, important, merge, index, currentFileInfo, inline, variable) {
     this.name = name;
@@ -41,17 +42,20 @@ Declaration.prototype.genCSS = function (context, output) {
     output.add(this.important + ((this.inline || (context.lastRule && context.compress)) ? '' : ';'), this._fileInfo, this._index);
 };
 Declaration.prototype.eval = function (context) {
-    var strictMathBypass = false, name = this.name, evaldValue, variable = this.variable;
+    var mathBypass = false, prevMath, name = this.name, evaldValue, variable = this.variable;
     if (typeof name !== 'string') {
         // expand 'primitive' name directly to get
         // things faster (~10% for benchmark.less):
         name = (name.length === 1) && (name[0] instanceof Keyword) ?
                 name[0].value : evalName(context, name);
         variable = false; // never treat expanded interpolation as new variable name
     }
-    if (name === 'font' && !context.strictMath) {
-        strictMathBypass = true;
-        context.strictMath = true;
+
+    // @todo remove when parens-division is default
+    if (name === 'font' && context.math === MATH.ALWAYS) {
+        mathBypass = true;
+        prevMath = context.math;
+        context.math = MATH.PARENS_DIVISION;
     }
     try {
         context.importantScope.push({});
@@ -82,8 +86,8 @@ Declaration.prototype.eval = function (context) {
         throw e;
     }
     finally {
-        if (strictMathBypass) {
-            context.strictMath = false;
+        if (mathBypass) {
+            context.math = prevMath;
         }
     }
 };

lib/less/tree/expression.js

@@ -1,6 +1,8 @@
 var Node = require('./node'),
     Paren = require('./paren'),
-    Comment = require('./comment');
+    Comment = require('./comment'),
+    Dimension = require('./dimension'),
+    MATH = require('../math-constants');
 
 var Expression = function (value, noSpacing) {
     this.value = value;
@@ -17,7 +19,8 @@ Expression.prototype.accept = function (visitor) {
 Expression.prototype.eval = function (context) {
     var returnValue,
         mathOn = context.isMathOn(),
-        inParenthesis = this.parens && !this.parensInOp,
+        inParenthesis = this.parens && 
+            (context.math !== MATH.STRICT_LEGACY || !this.parensInOp),
         doubleParen = false;
     if (inParenthesis) {
         context.inParenthesis();
@@ -40,7 +43,8 @@ Expression.prototype.eval = function (context) {
     if (inParenthesis) {
         context.outOfParenthesis();
     }
-    if (this.parens && this.parensInOp && !mathOn && !doubleParen) {
+    if (this.parens && this.parensInOp && !mathOn && !doubleParen 
+        && (!(returnValue instanceof Dimension))) {
         returnValue = new Paren(returnValue);
     }
     return returnValue;

lib/less/tree/operation.js

@@ -1,6 +1,7 @@
 var Node = require('./node'),
     Color = require('./color'),
-    Dimension = require('./dimension');
+    Dimension = require('./dimension'),
+    MATH = require('../math-constants');
 
 var Operation = function (op, operands, isSpaced) {
     this.op = op.trim();
@@ -14,21 +15,26 @@ Operation.prototype.accept = function (visitor) {
 };
 Operation.prototype.eval = function (context) {
     var a = this.operands[0].eval(context),
-        b = this.operands[1].eval(context);
+        b = this.operands[1].eval(context),
+        op;
 
-    if (context.isMathOn()) {
+    if (context.isMathOn(this.op)) {
+        op = this.op === './' ? '/' : this.op;
         if (a instanceof Dimension && b instanceof Color) {
             a = a.toColor();
         }
         if (b instanceof Dimension && a instanceof Color) {
             b = b.toColor();
         }
         if (!a.operate) {
+            if (a instanceof Operation && a.op === '/' && context.math === MATH.PARENS_DIVISION) {
+                return new Operation(this.op, [a, b], this.isSpaced);
+            }
             throw { type: 'Operation',
                 message: 'Operation on an invalid type' };
         }
 
-        return a.operate(context, this.op, b);
+        return a.operate(context, op, b);
     } else {
         return new Operation(this.op, [a, b], this.isSpaced);
     }

lib/less/utils.js

@@ -1,4 +1,6 @@
 /* jshint proto: true */
+var MATH = require('./math-constants');
+
 var utils = {
     getLocation: function(index, inputStream) {
         var n = index + 1,
@@ -36,6 +38,29 @@ var utils = {
         }
         return cloned;
     },
+    copyOptions: function(obj1, obj2) {
+        var opts = utils.defaults(obj1, obj2);
+        if (opts.strictMath) {
+            opts.math = MATH.STRICT_LEGACY;
+        }
+        if (opts.hasOwnProperty('math') && typeof opts.math === 'string') {
+            switch (opts.math.toLowerCase()) {
+                case 'always':
+                    opts.math = MATH.ALWAYS;
+                    break;
+                case 'parens-division':
+                    opts.math = MATH.PARENS_DIVISION;
+                    break;
+                case 'strict':
+                case 'parens':
+                    opts.math = MATH.PARENS;
+                    break;
+                case 'strict-legacy':
+                    opts.math = MATH.STRICT_LEGACY;
+            }
+        }
+        return opts;
+    },
     defaults: function(obj1, obj2) {
         if (!obj2._defaults || obj2._defaults !== obj1) {
             for (var prop in obj1) {

test/browser/runner-browser-options.js

@@ -2,7 +2,7 @@ var less = {
     logLevel: 4, 
     errorReporting: 'console', 
     javascriptEnabled: true,
-    strictMath: false
+    math: 'always'
 };
 
 // There originally run inside describe method. However, since they have not

test/browser/runner-errors-options.js

@@ -1,6 +1,6 @@
 var less = {
     strictUnits: true,
-    strictMath: true,
+    math: 'strict-legacy',
     logLevel: 4,
     javascriptEnabled: true
 };

test/browser/runner-legacy-options.js

@@ -1,6 +1,6 @@
 var less = {
     logLevel: 4,
     errorReporting: 'console',
-    strictMath: false,
+    math: 'always',
     strictUnits: false
 };

test/css/calc.css

@@ -3,12 +3,12 @@
   root2: calc(100% - 40px);
   width: calc(50% + (25vh - 20px));
   height: calc(50% + (25vh - 20px));
-  min-height: calc((10vh) + calc(5vh));
+  min-height: calc(10vh + calc(5vh));
   foo: 3 calc(3 + 4) 11;
   bar: calc(1 + 20%);
 }
 .b {
-  one: calc(100% - (20px));
+  one: calc(100% - 20px);
   two: calc(100% - (10px + 10px));
   three: calc(100% - (3 * 1));
   four: calc(100% - (3 * 1));

test/css/css-3.css

@@ -73,14 +73,6 @@ p::before {
     font-size: 12px;
   }
 }
-.units {
-  font: 1.2rem/2rem;
-  font: 8vw/9vw;
-  font: 10vh/12vh;
-  font: 12vm/15vm;
-  font: 12vmin/15vmin;
-  font: 1.2ch/1.5ch;
-}
 @supports ( box-shadow: 2px 2px 2px black ) or
           ( -moz-box-shadow: 2px 2px 2px black ) {
   .outline {

test/css/functions.css

@@ -223,4 +223,6 @@ html {
   e: ;
   f: 6;
   /* results in void */
+  color: green;
+  color: purple;
 }

test/css/math/parens-division/media-math.css

@@ -0,0 +1,10 @@
+@media (min-width: 17) {
+  .foo {
+    bar: 1;
+  }
+}
+@media (min-width: 16 / 9) {
+  .foo {
+    bar: 1;
+  }
+}