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node_modules/braces/lib/parse.js

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+'use strict';
+
+const stringify = require('./stringify');
+
+/**
+ * Constants
+ */
+
+const {
+  MAX_LENGTH,
+  CHAR_BACKSLASH, /* \ */
+  CHAR_BACKTICK, /* ` */
+  CHAR_COMMA, /* , */
+  CHAR_DOT, /* . */
+  CHAR_LEFT_PARENTHESES, /* ( */
+  CHAR_RIGHT_PARENTHESES, /* ) */
+  CHAR_LEFT_CURLY_BRACE, /* { */
+  CHAR_RIGHT_CURLY_BRACE, /* } */
+  CHAR_LEFT_SQUARE_BRACKET, /* [ */
+  CHAR_RIGHT_SQUARE_BRACKET, /* ] */
+  CHAR_DOUBLE_QUOTE, /* " */
+  CHAR_SINGLE_QUOTE, /* ' */
+  CHAR_NO_BREAK_SPACE,
+  CHAR_ZERO_WIDTH_NOBREAK_SPACE
+} = require('./constants');
+
+/**
+ * parse
+ */
+
+const parse = (input, options = {}) => {
+  if (typeof input !== 'string') {
+    throw new TypeError('Expected a string');
+  }
+
+  let opts = options || {};
+  let max = typeof opts.maxLength === 'number' ? Math.min(MAX_LENGTH, opts.maxLength) : MAX_LENGTH;
+  if (input.length > max) {
+    throw new SyntaxError(`Input length (${input.length}), exceeds max characters (${max})`);
+  }
+
+  let ast = { type: 'root', input, nodes: [] };
+  let stack = [ast];
+  let block = ast;
+  let prev = ast;
+  let brackets = 0;
+  let length = input.length;
+  let index = 0;
+  let depth = 0;
+  let value;
+  let memo = {};
+
+  /**
+   * Helpers
+   */
+
+  const advance = () => input[index++];
+  const push = node => {
+    if (node.type === 'text' && prev.type === 'dot') {
+      prev.type = 'text';
+    }
+
+    if (prev && prev.type === 'text' && node.type === 'text') {
+      prev.value += node.value;
+      return;
+    }
+
+    block.nodes.push(node);
+    node.parent = block;
+    node.prev = prev;
+    prev = node;
+    return node;
+  };
+
+  push({ type: 'bos' });
+
+  while (index < length) {
+    block = stack[stack.length - 1];
+    value = advance();
+
+    /**
+     * Invalid chars
+     */
+
+    if (value === CHAR_ZERO_WIDTH_NOBREAK_SPACE || value === CHAR_NO_BREAK_SPACE) {
+      continue;
+    }
+
+    /**
+     * Escaped chars
+     */
+
+    if (value === CHAR_BACKSLASH) {
+      push({ type: 'text', value: (options.keepEscaping ? value : '') + advance() });
+      continue;
+    }
+
+    /**
+     * Right square bracket (literal): ']'
+     */
+
+    if (value === CHAR_RIGHT_SQUARE_BRACKET) {
+      push({ type: 'text', value: '\\' + value });
+      continue;
+    }
+
+    /**
+     * Left square bracket: '['
+     */
+
+    if (value === CHAR_LEFT_SQUARE_BRACKET) {
+      brackets++;
+
+      let closed = true;
+      let next;
+
+      while (index < length && (next = advance())) {
+        value += next;
+
+        if (next === CHAR_LEFT_SQUARE_BRACKET) {
+          brackets++;
+          continue;
+        }
+
+        if (next === CHAR_BACKSLASH) {
+          value += advance();
+          continue;
+        }
+
+        if (next === CHAR_RIGHT_SQUARE_BRACKET) {
+          brackets--;
+
+          if (brackets === 0) {
+            break;
+          }
+        }
+      }
+
+      push({ type: 'text', value });
+      continue;
+    }
+
+    /**
+     * Parentheses
+     */
+
+    if (value === CHAR_LEFT_PARENTHESES) {
+      block = push({ type: 'paren', nodes: [] });
+      stack.push(block);
+      push({ type: 'text', value });
+      continue;
+    }
+
+    if (value === CHAR_RIGHT_PARENTHESES) {
+      if (block.type !== 'paren') {
+        push({ type: 'text', value });
+        continue;
+      }
+      block = stack.pop();
+      push({ type: 'text', value });
+      block = stack[stack.length - 1];
+      continue;
+    }
+
+    /**
+     * Quotes: '|"|`
+     */
+
+    if (value === CHAR_DOUBLE_QUOTE || value === CHAR_SINGLE_QUOTE || value === CHAR_BACKTICK) {
+      let open = value;
+      let next;
+
+      if (options.keepQuotes !== true) {
+        value = '';
+      }
+
+      while (index < length && (next = advance())) {
+        if (next === CHAR_BACKSLASH) {
+          value += next + advance();
+          continue;
+        }
+
+        if (next === open) {
+          if (options.keepQuotes === true) value += next;
+          break;
+        }
+
+        value += next;
+      }
+
+      push({ type: 'text', value });
+      continue;
+    }
+
+    /**
+     * Left curly brace: '{'
+     */
+
+    if (value === CHAR_LEFT_CURLY_BRACE) {
+      depth++;
+
+      let dollar = prev.value && prev.value.slice(-1) === '$' || block.dollar === true;
+      let brace = {
+        type: 'brace',
+        open: true,
+        close: false,
+        dollar,
+        depth,
+        commas: 0,
+        ranges: 0,
+        nodes: []
+      };
+
+      block = push(brace);
+      stack.push(block);
+      push({ type: 'open', value });
+      continue;
+    }
+
+    /**
+     * Right curly brace: '}'
+     */
+
+    if (value === CHAR_RIGHT_CURLY_BRACE) {
+      if (block.type !== 'brace') {
+        push({ type: 'text', value });
+        continue;
+      }
+
+      let type = 'close';
+      block = stack.pop();
+      block.close = true;
+
+      push({ type, value });
+      depth--;
+
+      block = stack[stack.length - 1];
+      continue;
+    }
+
+    /**
+     * Comma: ','
+     */
+
+    if (value === CHAR_COMMA && depth > 0) {
+      if (block.ranges > 0) {
+        block.ranges = 0;
+        let open = block.nodes.shift();
+        block.nodes = [open, { type: 'text', value: stringify(block) }];
+      }
+
+      push({ type: 'comma', value });
+      block.commas++;
+      continue;
+    }
+
+    /**
+     * Dot: '.'
+     */
+
+    if (value === CHAR_DOT && depth > 0 && block.commas === 0) {
+      let siblings = block.nodes;
+
+      if (depth === 0 || siblings.length === 0) {
+        push({ type: 'text', value });
+        continue;
+      }
+
+      if (prev.type === 'dot') {
+        block.range = [];
+        prev.value += value;
+        prev.type = 'range';
+
+        if (block.nodes.length !== 3 && block.nodes.length !== 5) {
+          block.invalid = true;
+          block.ranges = 0;
+          prev.type = 'text';
+          continue;
+        }
+
+        block.ranges++;
+        block.args = [];
+        continue;
+      }
+
+      if (prev.type === 'range') {
+        siblings.pop();
+
+        let before = siblings[siblings.length - 1];
+        before.value += prev.value + value;
+        prev = before;
+        block.ranges--;
+        continue;
+      }
+
+      push({ type: 'dot', value });
+      continue;
+    }
+
+    /**
+     * Text
+     */
+
+    push({ type: 'text', value });
+  }
+
+  // Mark imbalanced braces and brackets as invalid
+  do {
+    block = stack.pop();
+
+    if (block.type !== 'root') {
+      block.nodes.forEach(node => {
+        if (!node.nodes) {
+          if (node.type === 'open') node.isOpen = true;
+          if (node.type === 'close') node.isClose = true;
+          if (!node.nodes) node.type = 'text';
+          node.invalid = true;
+        }
+      });
+
+      // get the location of the block on parent.nodes (block's siblings)
+      let parent = stack[stack.length - 1];
+      let index = parent.nodes.indexOf(block);
+      // replace the (invalid) block with it's nodes
+      parent.nodes.splice(index, 1, ...block.nodes);
+    }
+  } while (stack.length > 0);
+
+  push({ type: 'eos' });
+  return ast;
+};
+
+module.exports = parse;