flow like the river

VISUALIZACION/node_modules/cssnano/dist/lib/normalizeString.js

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+'use strict';
+
+exports.__esModule = true;
+
+var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };
+
+var postcss = require('postcss');
+var valueParser = require('postcss-value-parser');
+
+/*
+ * Constants (parser usage)
+ */
+
+var SINGLE_QUOTE = 39;
+var DOUBLE_QUOTE = 34;
+var BACKSLASH = 92;
+var NEWLINE = 10;
+var SPACE = 32;
+var FEED = 12;
+var TAB = 9;
+var CR = 13;
+
+var WORD_END = /[ \n\t\r\f'"\\]/g;
+
+/*
+ * Constants (node type strings)
+ */
+
+var C_STRING = 'string';
+var C_ESCAPED_SINGLE_QUOTE = 'escapedSingleQuote';
+var C_ESCAPED_DOUBLE_QUOTE = 'escapedDoubleQuote';
+var C_SINGLE_QUOTE = 'singleQuote';
+var C_DOUBLE_QUOTE = 'doubleQuote';
+var C_NEWLINE = 'newline';
+var C_SINGLE = 'single';
+
+/*
+ * Literals
+ */
+
+var L_SINGLE_QUOTE = '\'';
+var L_DOUBLE_QUOTE = '"';
+var L_NEWLINE = '\\\n';
+
+/*
+ * Parser nodes
+ */
+
+var T_ESCAPED_SINGLE_QUOTE = { type: C_ESCAPED_SINGLE_QUOTE, value: '\\\'' };
+var T_ESCAPED_DOUBLE_QUOTE = { type: C_ESCAPED_DOUBLE_QUOTE, value: '\\"' };
+var T_SINGLE_QUOTE = { type: C_SINGLE_QUOTE, value: L_SINGLE_QUOTE };
+var T_DOUBLE_QUOTE = { type: C_DOUBLE_QUOTE, value: L_DOUBLE_QUOTE };
+var T_NEWLINE = { type: C_NEWLINE, value: L_NEWLINE };
+
+function stringify(ast) {
+    return ast.nodes.reduce(function (str, _ref) {
+        var value = _ref.value;
+
+        // Collapse multiple line strings automatically
+        if (value === L_NEWLINE) {
+            return str;
+        }
+        return str + value;
+    }, '');
+}
+
+function parse(str) {
+    var code = void 0,
+        next = void 0,
+        value = void 0;
+    var pos = 0;
+    var len = str.length;
+
+    var ast = {
+        nodes: [],
+        types: {
+            escapedSingleQuote: 0,
+            escapedDoubleQuote: 0,
+            singleQuote: 0,
+            doubleQuote: 0
+        },
+        quotes: false
+    };
+
+    while (pos < len) {
+        code = str.charCodeAt(pos);
+        switch (code) {
+            case SPACE:
+            case TAB:
+            case CR:
+            case FEED:
+                next = pos;
+                do {
+                    next += 1;
+                    code = str.charCodeAt(next);
+                } while (code === SPACE || code === NEWLINE || code === TAB || code === CR || code === FEED);
+
+                ast.nodes.push({
+                    type: 'space',
+                    value: str.slice(pos, next)
+                });
+                pos = next - 1;
+                break;
+            case SINGLE_QUOTE:
+                ast.nodes.push(T_SINGLE_QUOTE);
+                ast.types[C_SINGLE_QUOTE]++;
+                ast.quotes = true;
+                break;
+            case DOUBLE_QUOTE:
+                ast.nodes.push(T_DOUBLE_QUOTE);
+                ast.types[C_DOUBLE_QUOTE]++;
+                ast.quotes = true;
+                break;
+            case BACKSLASH:
+                next = pos + 1;
+                if (str.charCodeAt(next) === SINGLE_QUOTE) {
+                    ast.nodes.push(T_ESCAPED_SINGLE_QUOTE);
+                    ast.types[C_ESCAPED_SINGLE_QUOTE]++;
+                    ast.quotes = true;
+                    pos = next;
+                    break;
+                } else if (str.charCodeAt(next) === DOUBLE_QUOTE) {
+                    ast.nodes.push(T_ESCAPED_DOUBLE_QUOTE);
+                    ast.types[C_ESCAPED_DOUBLE_QUOTE]++;
+                    ast.quotes = true;
+                    pos = next;
+                    break;
+                } else if (str.charCodeAt(next) === NEWLINE) {
+                    ast.nodes.push(T_NEWLINE);
+                    pos = next;
+                    break;
+                }
+            /*
+             * We need to fall through here to handle the token as
+             * a whole word. The missing 'break' is intentional.
+             */
+            default:
+                WORD_END.lastIndex = pos + 1;
+                WORD_END.test(str);
+
+                if (WORD_END.lastIndex === 0) {
+                    next = len - 1;
+                } else {
+                    next = WORD_END.lastIndex - 2;
+                }
+
+                value = str.slice(pos, next + 1);
+
+                ast.nodes.push({
+                    type: C_STRING,
+                    value: value
+                });
+
+                pos = next;
+        }
+        pos++;
+    }
+
+    return ast;
+}
+
+function changeWrappingQuotes(node, ast) {
+    var types = ast.types;
+
+    if (types[C_SINGLE_QUOTE] || types[C_DOUBLE_QUOTE]) {
+        return;
+    }
+
+    if (node.quote === L_SINGLE_QUOTE && types[C_ESCAPED_SINGLE_QUOTE] > 0 && !types[C_ESCAPED_DOUBLE_QUOTE]) {
+        node.quote = L_DOUBLE_QUOTE;
+    }
+
+    if (node.quote === L_DOUBLE_QUOTE && types[C_ESCAPED_DOUBLE_QUOTE] > 0 && !types[C_ESCAPED_SINGLE_QUOTE]) {
+        node.quote = L_SINGLE_QUOTE;
+    }
+
+    ast.nodes = ast.nodes.reduce(function (newAst, child) {
+        if (child.type === C_ESCAPED_DOUBLE_QUOTE && node.quote === L_SINGLE_QUOTE) {
+            return [].concat(newAst, [T_DOUBLE_QUOTE]);
+        }
+        if (child.type === C_ESCAPED_SINGLE_QUOTE && node.quote === L_DOUBLE_QUOTE) {
+            return [].concat(newAst, [T_SINGLE_QUOTE]);
+        }
+        return [].concat(newAst, [child]);
+    }, []);
+}
+
+function normalize(value, preferredQuote) {
+    if (!value || !value.length) {
+        return value;
+    }
+    return valueParser(value).walk(function (child) {
+        if (child.type !== C_STRING) {
+            return;
+        }
+        var ast = parse(child.value);
+        if (ast.quotes) {
+            changeWrappingQuotes(child, ast);
+        } else if (preferredQuote === C_SINGLE) {
+            child.quote = L_SINGLE_QUOTE;
+        } else {
+            child.quote = L_DOUBLE_QUOTE;
+        }
+        child.value = stringify(ast);
+    }).toString();
+}
+
+exports.default = postcss.plugin('cssnano-normalize-string', function (opts) {
+    var _preferredQuote$opts = _extends({
+        preferredQuote: 'double'
+    }, opts),
+        preferredQuote = _preferredQuote$opts.preferredQuote;
+
+    return function (css) {
+        css.walk(function (node) {
+            if (node.type === 'rule') {
+                node.selector = normalize(node.selector, preferredQuote);
+            }
+            if (node.type === 'decl') {
+                node.value = normalize(node.value, preferredQuote);
+            }
+            if (node.type === 'atrule') {
+                node.params = normalize(node.params, preferredQuote);
+            }
+        });
+    };
+});
+module.exports = exports['default'];