1 files changed, 62 insertions, 0 deletions
diff --git a/node_modules/postcss-calc/index.js b/node_modules/postcss-calc/index.js
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+++ b/node_modules/postcss-calc/index.js
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+/**
+ * Module dependencies.
+ */
+var reduceCSSCalc = require("reduce-css-calc")
+var helpers = require("postcss-message-helpers")
+var postcss = require("postcss")
+
+var CONTAINS_CALC = /\bcalc\([\s\S]*?\)/
+
+/**
+ * PostCSS plugin to reduce calc() function calls.
+ */
+module.exports = postcss.plugin("postcss-calc", function(options) {
+  options = options || {}
+  var precision = options.precision
+  var preserve = options.preserve
+  var warnWhenCannotResolve = options.warnWhenCannotResolve
+  var mediaQueries = options.mediaQueries
+  var selectors = options.selectors
+
+  return function(style, result) {
+    function transformValue(node, property) {
+      var value = node[property]
+
+      if (!value || !CONTAINS_CALC.test(value)) {
+        return
+      }
+
+      helpers.try(function transformCSSCalc() {
+        var reducedValue = reduceCSSCalc(value, precision)
+
+        if (warnWhenCannotResolve && CONTAINS_CALC.test(reducedValue)) {
+          result.warn("Could not reduce expression: " + value,
+            {plugin: "postcss-calc", node: node})
+        }
+
+        if (!preserve) {
+          node[property] = reducedValue
+          return
+        }
+
+        if (reducedValue != value) {
+          var clone = node.clone()
+          clone[property] = reducedValue
+          node.parent.insertBefore(node, clone)
+        }
+      }, node.source)
+    }
+
+    style.walk(function(rule) {
+      if (mediaQueries && rule.type === "atrule") {
+        return transformValue(rule, "params")
+      }
+      else if (rule.type === "decl") {
+        return transformValue(rule, "value")
+      }
+      else if (selectors && rule.type === "rule") {
+        return transformValue(rule, "selector")
+      }
+    })
+  }
+})