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Side by Side Diff: chrome/tools/profile_reset/jtl_parser.h

Issue 24998003: Compiler for the JSON Traversal Language. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Addressed comments, added some unittests. Created 7 years, 2 months ago
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1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef CHROME_TOOLS_PROFILE_RESET_JTL_PARSER_H_
6 #define CHROME_TOOLS_PROFILE_RESET_JTL_PARSER_H_
7
8 #include <string>
9 #include <vector>
10
11 #include "base/basictypes.h"
12 #include "base/values.h"
13
14 // Parses text-based JTL source code into a stream of operation names, arguments
15 // and separator kinds.
16 class JtlParser {
17 public:
18 // Creates a new parser to parse |compacted_source_code|, which should already
19 // be stripped of all comments and whitespace (except inside string literals).
20 // Use RemoveCommentsAndAllWhitespace() to manufacture these arguments, also
21 // see its comments for a description of |newline_indices|.
22 JtlParser(const std::string& compacted_source_code,
23 const std::vector<size_t>& newline_indices);
24 ~JtlParser();
25
26 // Removes comments from |verbose_text| and compacts it into whitespace-free
27 // format. Elements in |newline_indices| will be monotonically increasing,
28 // and will refer to positions in |compacted_text| such that a new line has
battre 2013/10/01 12:18:26 such that |newline_indices[i]| indicates the numbe
engedy 2013/10/01 15:09:33 Added example to clarify.
29 // been removed before that position.
30 // Returns true on success, false if there were unmatched quotes in a line, in
31 // which case |error_line_number| will be set accordingly if it is non-NULL.
32 static bool RemoveCommentsAndAllWhitespace(
33 const std::string& verbose_text,
34 std::string* compacted_text,
35 std::vector<size_t>* newline_indices,
36 size_t* error_line_number);
37
38 // Returns true if the entire input has been successfully consumed. Note that
39 // even when this returns false, a subsequent call to ParseNextOperation()
40 // might still fail if the next operation cannot be parsed.
41 bool HasFinished();
42
43 // Fetches the |name| and the |argument_list| of the next operation, and also
44 // whether or not it |ends_the_sentence|, i.e. it is followed by the
45 // end-of-sentence separator.
46 // Returns false if there is a parsing error, in which case the values for the
47 // output parameters are undefined, and |this| parser shall no longer be used.
48 bool ParseNextOperation(std::string* name,
49 base::ListValue* argument_list,
50 bool* ends_the_sentence);
51
52 // Returns the compacted source code that was passed in to the constructor.
53 const std::string& compacted_source() const { return compacted_source_; }
54
55 // Returns at which line the character at position |compacted_index| in the
56 // |compacted_source()| was originally located.
57 size_t GetOriginalLineNumber(size_t compacted_index) const;
58
59 size_t last_line_number() const;
battre 2013/10/01 12:18:26 If this is hacker_style it should be inlined. If t
engedy 2013/10/01 15:09:33 Changed to CamelCase, as this cannot be inlined du
60 std::string last_context() const;
61
62 private:
63 // Contains pre-compiled regular expressions and related state. Factored out
64 // to avoid this header depending on RE2 headers.
65 struct ParsingState;
66
67 std::string compacted_source_;
68 std::vector<size_t> newline_indices_;
69 scoped_ptr<ParsingState> state_;
70
71 DISALLOW_COPY_AND_ASSIGN(JtlParser);
72 };
73
74 #endif // CHROME_TOOLS_PROFILE_RESET_JTL_PARSER_H_
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