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node_modules/css-tree/lib/generator/create.js

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+import { tokenize, Delim, WhiteSpace } from '../tokenizer/index.js';
+import { generateSourceMap } from './sourceMap.js';
+import * as tokenBefore from './token-before.js';
+
+const REVERSESOLIDUS = 0x005c; // U+005C REVERSE SOLIDUS (\)
+
+function processChildren(node, delimeter) {
+    if (typeof delimeter === 'function') {
+        let prev = null;
+
+        node.children.forEach(node => {
+            if (prev !== null) {
+                delimeter.call(this, prev);
+            }
+
+            this.node(node);
+            prev = node;
+        });
+
+        return;
+    }
+
+    node.children.forEach(this.node, this);
+}
+
+function processChunk(chunk) {
+    tokenize(chunk, (type, start, end) => {
+        this.token(type, chunk.slice(start, end));
+    });
+}
+
+export function createGenerator(config) {
+    const types = new Map();
+
+    for (let name in config.node) {
+        const item = config.node[name];
+        const fn = item.generate || item;
+
+        if (typeof fn === 'function') {
+            types.set(name, item.generate || item);
+        }
+    }
+
+    return function(node, options) {
+        let buffer = '';
+        let prevCode = 0;
+        let handlers = {
+            node(node) {
+                if (types.has(node.type)) {
+                    types.get(node.type).call(publicApi, node);
+                } else {
+                    throw new Error('Unknown node type: ' + node.type);
+                }
+            },
+            tokenBefore: tokenBefore.safe,
+            token(type, value) {
+                prevCode = this.tokenBefore(prevCode, type, value);
+
+                this.emit(value, type, false);
+
+                if (type === Delim && value.charCodeAt(0) === REVERSESOLIDUS) {
+                    this.emit('\n', WhiteSpace, true);
+                }
+            },
+            emit(value) {
+                buffer += value;
+            },
+            result() {
+                return buffer;
+            }
+        };
+
+        if (options) {
+            if (typeof options.decorator === 'function') {
+                handlers = options.decorator(handlers);
+            }
+
+            if (options.sourceMap) {
+                handlers = generateSourceMap(handlers);
+            }
+
+            if (options.mode in tokenBefore) {
+                handlers.tokenBefore = tokenBefore[options.mode];
+            }
+        }
+
+        const publicApi = {
+            node: (node) => handlers.node(node),
+            children: processChildren,
+            token: (type, value) => handlers.token(type, value),
+            tokenize: processChunk
+        };
+
+        handlers.node(node);
+
+        return handlers.result();
+    };
+};