initial commit

node_modules/recast/lib/parser.js

@@ -0,0 +1,158 @@
+var assert = require("assert");
+var types = require("./types");
+var n = types.namedTypes;
+var b = types.builders;
+var isObject = types.builtInTypes.object;
+var isArray = types.builtInTypes.array;
+var isFunction = types.builtInTypes.function;
+var Patcher = require("./patcher").Patcher;
+var normalizeOptions = require("./options").normalize;
+var fromString = require("./lines").fromString;
+var attachComments = require("./comments").attach;
+var util = require("./util");
+
+exports.parse = function parse(source, options) {
+  options = normalizeOptions(options);
+
+  var lines = fromString(source, options);
+
+  var sourceWithoutTabs = lines.toString({
+    tabWidth: options.tabWidth,
+    reuseWhitespace: false,
+    useTabs: false
+  });
+
+  var comments = [];
+  var program = options.parser.parse(sourceWithoutTabs, {
+    jsx: true,
+    loc: true,
+    locations: true,
+    range: options.range,
+    comment: true,
+    onComment: comments,
+    tolerant: options.tolerant,
+    ecmaVersion: 6,
+    sourceType: 'module'
+  });
+
+  // If the source was empty, some parsers give loc.{start,end}.line
+  // values of 0, instead of the minimum of 1.
+  util.fixFaultyLocations(program, lines);
+
+  program.loc = program.loc || {
+    start: lines.firstPos(),
+    end: lines.lastPos()
+  };
+
+  program.loc.lines = lines;
+  program.loc.indent = 0;
+
+  // Expand the Program node's .loc to include all comments, since
+  // typically its .loc.start and .loc.end will coincide with those of the
+  // first and last statements, respectively, excluding any comments that
+  // fall outside that region.
+  var trueProgramLoc = util.getTrueLoc(program, lines);
+  program.loc.start = trueProgramLoc.start;
+  program.loc.end = trueProgramLoc.end;
+
+  if (program.comments) {
+    comments = program.comments;
+    delete program.comments;
+  }
+
+  // In order to ensure we reprint leading and trailing program comments,
+  // wrap the original Program node with a File node.
+  var file = program;
+  if (file.type === "Program") {
+    var file = b.file(program, options.sourceFileName || null);
+    file.loc = {
+      lines: lines,
+      indent: 0,
+      start: lines.firstPos(),
+      end: lines.lastPos()
+    };
+  } else if (file.type === "File") {
+    program = file.program;
+  }
+
+  // Passing file.program here instead of just file means that initial
+  // comments will be attached to program.body[0] instead of program.
+  attachComments(
+    comments,
+    program.body.length ? file.program : file,
+    lines
+  );
+
+  // Return a copy of the original AST so that any changes made may be
+  // compared to the original.
+  return new TreeCopier(lines).copy(file);
+};
+
+function TreeCopier(lines) {
+  assert.ok(this instanceof TreeCopier);
+  this.lines = lines;
+  this.indent = 0;
+}
+
+var TCp = TreeCopier.prototype;
+
+TCp.copy = function(node) {
+  if (isArray.check(node)) {
+    return node.map(this.copy, this);
+  }
+
+  if (!isObject.check(node)) {
+    return node;
+  }
+
+  util.fixFaultyLocations(node, this.lines);
+
+  var copy = Object.create(Object.getPrototypeOf(node), {
+    original: { // Provide a link from the copy to the original.
+      value: node,
+      configurable: false,
+      enumerable: false,
+      writable: true
+    }
+  });
+
+  var loc = node.loc;
+  var oldIndent = this.indent;
+  var newIndent = oldIndent;
+
+  if (loc) {
+    // When node is a comment, we set node.loc.indent to
+    // node.loc.start.column so that, when/if we print the comment by
+    // itself, we can strip that much whitespace from the left margin of
+    // the comment. This only really matters for multiline Block comments,
+    // but it doesn't hurt for Line comments.
+    if (node.type === "Block" || node.type === "Line" ||
+        node.type === "CommentBlock" || node.type === "CommentLine" ||
+        this.lines.isPrecededOnlyByWhitespace(loc.start)) {
+      newIndent = this.indent = loc.start.column;
+    }
+
+    loc.lines = this.lines;
+    loc.indent = newIndent;
+  }
+
+  var keys = Object.keys(node);
+  var keyCount = keys.length;
+  for (var i = 0; i < keyCount; ++i) {
+    var key = keys[i];
+    if (key === "loc") {
+      copy[key] = node[key];
+    } else if (key === "tokens" &&
+               node.type === "File") {
+      // Preserve file.tokens (uncopied) in case client code cares about
+      // it, even though Recast ignores it when reprinting.
+      copy[key] = node[key];
+    } else {
+      copy[key] = this.copy(node[key]);
+    }
+  }
+
+  this.indent = oldIndent;
+
+  return copy;
+};