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node_modules/recast/lib/parser.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.parse = void 0;
+var tslib_1 = require("tslib");
+var assert_1 = tslib_1.__importDefault(require("assert"));
+var types = tslib_1.__importStar(require("ast-types"));
+var b = types.builders;
+var isObject = types.builtInTypes.object;
+var isArray = types.builtInTypes.array;
+var options_1 = require("./options");
+var lines_1 = require("./lines");
+var comments_1 = require("./comments");
+var util = tslib_1.__importStar(require("./util"));
+function parse(source, options) {
+    options = options_1.normalize(options);
+    var lines = lines_1.fromString(source, options);
+    var sourceWithoutTabs = lines.toString({
+        tabWidth: options.tabWidth,
+        reuseWhitespace: false,
+        useTabs: false,
+    });
+    var comments = [];
+    var ast = options.parser.parse(sourceWithoutTabs, {
+        jsx: true,
+        loc: true,
+        locations: true,
+        range: options.range,
+        comment: true,
+        onComment: comments,
+        tolerant: util.getOption(options, "tolerant", true),
+        ecmaVersion: 6,
+        sourceType: util.getOption(options, "sourceType", "module"),
+    });
+    // Use ast.tokens if possible, and otherwise fall back to the Esprima
+    // tokenizer. All the preconfigured ../parsers/* expose ast.tokens
+    // automatically, but custom parsers might need additional configuration
+    // to avoid this fallback.
+    var tokens = Array.isArray(ast.tokens)
+        ? ast.tokens
+        : require("esprima").tokenize(sourceWithoutTabs, {
+            loc: true,
+        });
+    // We will reattach the tokens array to the file object below.
+    delete ast.tokens;
+    // Make sure every token has a token.value string.
+    tokens.forEach(function (token) {
+        if (typeof token.value !== "string") {
+            token.value = lines.sliceString(token.loc.start, token.loc.end);
+        }
+    });
+    if (Array.isArray(ast.comments)) {
+        comments = ast.comments;
+        delete ast.comments;
+    }
+    if (ast.loc) {
+        // If the source was empty, some parsers give loc.{start,end}.line
+        // values of 0, instead of the minimum of 1.
+        util.fixFaultyLocations(ast, lines);
+    }
+    else {
+        ast.loc = {
+            start: lines.firstPos(),
+            end: lines.lastPos(),
+        };
+    }
+    ast.loc.lines = lines;
+    ast.loc.indent = 0;
+    var file;
+    var program;
+    if (ast.type === "Program") {
+        program = ast;
+        // In order to ensure we reprint leading and trailing program
+        // comments, wrap the original Program node with a File node. Only
+        // ESTree parsers (Acorn and Esprima) return a Program as the root AST
+        // node. Most other (Babylon-like) parsers return a File.
+        file = b.file(ast, options.sourceFileName || null);
+        file.loc = {
+            start: lines.firstPos(),
+            end: lines.lastPos(),
+            lines: lines,
+            indent: 0,
+        };
+    }
+    else if (ast.type === "File") {
+        file = ast;
+        program = file.program;
+    }
+    // Expose file.tokens unless the caller passed false for options.tokens.
+    if (options.tokens) {
+        file.tokens = tokens;
+    }
+    // Expand the Program's .loc to include all comments (not just those
+    // attached to the Program node, as its children may have comments as
+    // well), since sometimes program.loc.{start,end} will coincide with the
+    // .loc.{start,end} of the first and last *statements*, mistakenly
+    // excluding comments that fall outside that region.
+    var trueProgramLoc = util.getTrueLoc({
+        type: program.type,
+        loc: program.loc,
+        body: [],
+        comments: comments,
+    }, lines);
+    program.loc.start = trueProgramLoc.start;
+    program.loc.end = trueProgramLoc.end;
+    // Passing file.program here instead of just file means that initial
+    // comments will be attached to program.body[0] instead of program.
+    comments_1.attach(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, tokens).copy(file);
+}
+exports.parse = parse;
+var TreeCopier = function TreeCopier(lines, tokens) {
+    assert_1.default.ok(this instanceof TreeCopier);
+    this.lines = lines;
+    this.tokens = tokens;
+    this.startTokenIndex = 0;
+    this.endTokenIndex = tokens.length;
+    this.indent = 0;
+    this.seen = new Map();
+};
+var TCp = TreeCopier.prototype;
+TCp.copy = function (node) {
+    if (this.seen.has(node)) {
+        return this.seen.get(node);
+    }
+    if (isArray.check(node)) {
+        var copy_1 = new Array(node.length);
+        this.seen.set(node, copy_1);
+        node.forEach(function (item, i) {
+            copy_1[i] = this.copy(item);
+        }, this);
+        return copy_1;
+    }
+    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,
+        },
+    });
+    this.seen.set(node, copy);
+    var loc = node.loc;
+    var oldIndent = this.indent;
+    var newIndent = oldIndent;
+    var oldStartTokenIndex = this.startTokenIndex;
+    var oldEndTokenIndex = this.endTokenIndex;
+    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;
+        }
+        // Every node.loc has a reference to the original source lines as well
+        // as a complete list of source tokens.
+        loc.lines = this.lines;
+        loc.tokens = this.tokens;
+        loc.indent = newIndent;
+        // Set loc.start.token and loc.end.token such that
+        // loc.tokens.slice(loc.start.token, loc.end.token) returns a list of
+        // all the tokens that make up this node.
+        this.findTokenRange(loc);
+    }
+    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;
+    this.startTokenIndex = oldStartTokenIndex;
+    this.endTokenIndex = oldEndTokenIndex;
+    return copy;
+};
+// If we didn't have any idea where in loc.tokens to look for tokens
+// contained by this loc, a binary search would be appropriate, but
+// because we maintain this.startTokenIndex and this.endTokenIndex as we
+// traverse the AST, we only need to make small (linear) adjustments to
+// those indexes with each recursive iteration.
+TCp.findTokenRange = function (loc) {
+    // In the unlikely event that loc.tokens[this.startTokenIndex] starts
+    // *after* loc.start, we need to rewind this.startTokenIndex first.
+    while (this.startTokenIndex > 0) {
+        var token = loc.tokens[this.startTokenIndex];
+        if (util.comparePos(loc.start, token.loc.start) < 0) {
+            --this.startTokenIndex;
+        }
+        else
+            break;
+    }
+    // In the unlikely event that loc.tokens[this.endTokenIndex - 1] ends
+    // *before* loc.end, we need to fast-forward this.endTokenIndex first.
+    while (this.endTokenIndex < loc.tokens.length) {
+        var token = loc.tokens[this.endTokenIndex];
+        if (util.comparePos(token.loc.end, loc.end) < 0) {
+            ++this.endTokenIndex;
+        }
+        else
+            break;
+    }
+    // Increment this.startTokenIndex until we've found the first token
+    // contained by this node.
+    while (this.startTokenIndex < this.endTokenIndex) {
+        var token = loc.tokens[this.startTokenIndex];
+        if (util.comparePos(token.loc.start, loc.start) < 0) {
+            ++this.startTokenIndex;
+        }
+        else
+            break;
+    }
+    // Index into loc.tokens of the first token within this node.
+    loc.start.token = this.startTokenIndex;
+    // Decrement this.endTokenIndex until we've found the first token after
+    // this node (not contained by the node).
+    while (this.endTokenIndex > this.startTokenIndex) {
+        var token = loc.tokens[this.endTokenIndex - 1];
+        if (util.comparePos(loc.end, token.loc.end) < 0) {
+            --this.endTokenIndex;
+        }
+        else
+            break;
+    }
+    // Index into loc.tokens of the first token *after* this node.
+    // If loc.start.token === loc.end.token, the node contains no tokens,
+    // and the index is that of the next token following this node.
+    loc.end.token = this.endTokenIndex;
+};