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      1 // Copyright 2014 PDFium 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 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
      6 
      7 #ifndef XFA_FXFA_FM2JS_CXFA_FMLEXER_H_
      8 #define XFA_FXFA_FM2JS_CXFA_FMLEXER_H_
      9 
     10 #include <memory>
     11 #include <utility>
     12 
     13 #include "core/fxcrt/fx_string.h"
     14 
     15 enum XFA_FM_TOKEN {
     16   TOKand,
     17   TOKlparen,
     18   TOKrparen,
     19   TOKmul,
     20   TOKplus,
     21   TOKcomma,
     22   TOKminus,
     23   TOKdot,
     24   TOKdiv,
     25   TOKlt,
     26   TOKassign,
     27   TOKgt,
     28   TOKlbracket,
     29   TOKrbracket,
     30   TOKor,
     31   TOKdotscream,
     32   TOKdotstar,
     33   TOKdotdot,
     34   TOKle,
     35   TOKne,
     36   TOKeq,
     37   TOKge,
     38   TOKdo,
     39   TOKkseq,
     40   TOKksge,
     41   TOKksgt,
     42   TOKif,
     43   TOKin,
     44   TOKksle,
     45   TOKkslt,
     46   TOKksne,
     47   TOKksor,
     48   TOKnull,
     49   TOKbreak,
     50   TOKksand,
     51   TOKend,
     52   TOKeof,
     53   TOKfor,
     54   TOKnan,
     55   TOKksnot,
     56   TOKvar,
     57   TOKthen,
     58   TOKelse,
     59   TOKexit,
     60   TOKdownto,
     61   TOKreturn,
     62   TOKinfinity,
     63   TOKendwhile,
     64   TOKforeach,
     65   TOKendfunc,
     66   TOKelseif,
     67   TOKwhile,
     68   TOKendfor,
     69   TOKthrow,
     70   TOKstep,
     71   TOKupto,
     72   TOKcontinue,
     73   TOKfunc,
     74   TOKendif,
     75   TOKstar,
     76   TOKidentifier,
     77   TOKunderscore,
     78   TOKdollar,
     79   TOKexclamation,
     80   TOKcall,
     81   TOKstring,
     82   TOKnumber,
     83   TOKreserver
     84 };
     85 
     86 struct XFA_FMKeyword {
     87   XFA_FM_TOKEN m_type;
     88   uint32_t m_hash;
     89   const wchar_t* m_keyword;
     90 };
     91 
     92 class CXFA_FMToken {
     93  public:
     94   CXFA_FMToken();
     95   explicit CXFA_FMToken(uint32_t line_num);
     96   ~CXFA_FMToken();
     97 
     98   WideString ToDebugString() const;
     99 
    100   WideStringView m_string;
    101   XFA_FM_TOKEN m_type;
    102   uint32_t m_line_num;
    103 };
    104 
    105 class CXFA_FMLexer {
    106  public:
    107   explicit CXFA_FMLexer(const WideStringView& wsFormcalc);
    108   ~CXFA_FMLexer();
    109 
    110   std::unique_ptr<CXFA_FMToken> NextToken();
    111 
    112   void SetCurrentLine(uint32_t line) { m_current_line = line; }
    113   const wchar_t* GetPos() { return m_cursor; }
    114   void SetPos(const wchar_t* pos) { m_cursor = pos; }
    115 
    116  private:
    117   void AdvanceForNumber();
    118   void AdvanceForString();
    119   void AdvanceForIdentifier();
    120   void AdvanceForComment();
    121 
    122   void RaiseError() {
    123     m_token.reset();
    124     m_lexer_error = true;
    125   }
    126 
    127   const wchar_t* m_cursor;
    128   const wchar_t* const m_end;
    129   uint32_t m_current_line;
    130   std::unique_ptr<CXFA_FMToken> m_token;
    131   bool m_lexer_error;
    132 };
    133 
    134 #endif  // XFA_FXFA_FM2JS_CXFA_FMLEXER_H_
    135