build: Add some required modules for node

1 files changed, 282 insertions, 0 deletions

diff --git a/node_modules/ret/lib/index.js b/node_modules/ret/lib/index.js
new file mode 100644
index 0000000..0e151c3
--- /dev/null
+++ b/node_modules/ret/lib/index.js
@@ -0,0 +1,282 @@
+var util      = require('./util');
+var types     = require('./types');
+var sets      = require('./sets');
+var positions = require('./positions');
+
+
+module.exports = function(regexpStr) {
+  var i = 0, l, c,
+      start = { type: types.ROOT, stack: []},
+
+      // Keep track of last clause/group and stack.
+      lastGroup = start,
+      last = start.stack,
+      groupStack = [];
+
+
+  var repeatErr = function(i) {
+    util.error(regexpStr, 'Nothing to repeat at column ' + (i - 1));
+  };
+
+  // Decode a few escaped characters.
+  var str = util.strToChars(regexpStr);
+  l = str.length;
+
+  // Iterate through each character in string.
+  while (i < l) {
+    c = str[i++];
+
+    switch (c) {
+      // Handle escaped characters, inclues a few sets.
+      case '\\':
+        c = str[i++];
+
+        switch (c) {
+          case 'b':
+            last.push(positions.wordBoundary());
+            break;
+
+          case 'B':
+            last.push(positions.nonWordBoundary());
+            break;
+
+          case 'w':
+            last.push(sets.words());
+            break;
+
+          case 'W':
+            last.push(sets.notWords());
+            break;
+
+          case 'd':
+            last.push(sets.ints());
+            break;
+
+          case 'D':
+            last.push(sets.notInts());
+            break;
+
+          case 's':
+            last.push(sets.whitespace());
+            break;
+
+          case 'S':
+            last.push(sets.notWhitespace());
+            break;
+
+          default:
+            // Check if c is integer.
+            // In which case it's a reference.
+            if (/\d/.test(c)) {
+              last.push({ type: types.REFERENCE, value: parseInt(c, 10) });
+
+            // Escaped character.
+            } else {
+              last.push({ type: types.CHAR, value: c.charCodeAt(0) });
+            }
+        }
+
+        break;
+
+
+      // Positionals.
+      case '^':
+          last.push(positions.begin());
+        break;
+
+      case '$':
+          last.push(positions.end());
+        break;
+
+
+      // Handle custom sets.
+      case '[':
+        // Check if this class is 'anti' i.e. [^abc].
+        var not;
+        if (str[i] === '^') {
+          not = true;
+          i++;
+        } else {
+          not = false;
+        }
+
+        // Get all the characters in class.
+        var classTokens = util.tokenizeClass(str.slice(i), regexpStr);
+
+        // Increase index by length of class.
+        i += classTokens[1];
+        last.push({
+          type: types.SET,
+          set: classTokens[0],
+          not: not,
+        });
+
+        break;
+
+
+      // Class of any character except \n.
+      case '.':
+        last.push(sets.anyChar());
+        break;
+
+
+      // Push group onto stack.
+      case '(':
+        // Create group.
+        var group = {
+          type: types.GROUP,
+          stack: [],
+          remember: true,
+        };
+
+        c = str[i];
+
+        // If if this is a special kind of group.
+        if (c === '?') {
+          c = str[i + 1];
+          i += 2;
+
+          // Match if followed by.
+          if (c === '=') {
+            group.followedBy = true;
+
+          // Match if not followed by.
+          } else if (c === '!') {
+            group.notFollowedBy = true;
+
+          } else if (c !== ':') {
+            util.error(regexpStr,
+              'Invalid group, character \'' + c +
+              '\' after \'?\' at column ' + (i - 1));
+          }
+
+          group.remember = false;
+        }
+
+        // Insert subgroup into current group stack.
+        last.push(group);
+
+        // Remember the current group for when the group closes.
+        groupStack.push(lastGroup);
+
+        // Make this new group the current group.
+        lastGroup = group;
+        last = group.stack;
+        break;
+
+
+      // Pop group out of stack.
+      case ')':
+        if (groupStack.length === 0) {
+          util.error(regexpStr, 'Unmatched ) at column ' + (i - 1));
+        }
+        lastGroup = groupStack.pop();
+
+        // Check if this group has a PIPE.
+        // To get back the correct last stack.
+        last = lastGroup.options ?
+          lastGroup.options[lastGroup.options.length - 1] : lastGroup.stack;
+        break;
+
+
+      // Use pipe character to give more choices.
+      case '|':
+        // Create array where options are if this is the first PIPE
+        // in this clause.
+        if (!lastGroup.options) {
+          lastGroup.options = [lastGroup.stack];
+          delete lastGroup.stack;
+        }
+
+        // Create a new stack and add to options for rest of clause.
+        var stack = [];
+        lastGroup.options.push(stack);
+        last = stack;
+        break;
+
+
+      // Repetition.
+      // For every repetition, remove last element from last stack
+      // then insert back a RANGE object.
+      // This design is chosen because there could be more than
+      // one repetition symbols in a regex i.e. `a?+{2,3}`.
+      case '{':
+        var rs = /^(\d+)(,(\d+)?)?\}/.exec(str.slice(i)), min, max;
+        if (rs !== null) {
+          if (last.length === 0) {
+            repeatErr(i);
+          }
+          min = parseInt(rs[1], 10);
+          max = rs[2] ? rs[3] ? parseInt(rs[3], 10) : Infinity : min;
+          i += rs[0].length;
+
+          last.push({
+            type: types.REPETITION,
+            min: min,
+            max: max,
+            value: last.pop(),
+          });
+        } else {
+          last.push({
+            type: types.CHAR,
+            value: 123,
+          });
+        }
+        break;
+
+      case '?':
+        if (last.length === 0) {
+          repeatErr(i);
+        }
+        last.push({
+          type: types.REPETITION,
+          min: 0,
+          max: 1,
+          value: last.pop(),
+        });
+        break;
+
+      case '+':
+        if (last.length === 0) {
+          repeatErr(i);
+        }
+        last.push({
+          type: types.REPETITION,
+          min: 1,
+          max: Infinity,
+          value: last.pop(),
+        });
+        break;
+
+      case '*':
+        if (last.length === 0) {
+          repeatErr(i);
+        }
+        last.push({
+          type: types.REPETITION,
+          min: 0,
+          max: Infinity,
+          value: last.pop(),
+        });
+        break;
+
+
+      // Default is a character that is not `\[](){}?+*^$`.
+      default:
+        last.push({
+          type: types.CHAR,
+          value: c.charCodeAt(0),
+        });
+    }
+
+  }
+
+  // Check if any groups have not been closed.
+  if (groupStack.length !== 0) {
+    util.error(regexpStr, 'Unterminated group');
+  }
+
+  return start;
+};
+
+module.exports.types = types;