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Diffstat (limited to 'src/vhdl/scanner.ads')
| -rw-r--r-- | src/vhdl/scanner.ads | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/src/vhdl/scanner.ads b/src/vhdl/scanner.ads new file mode 100644 index 0000000..ddc0d18 --- /dev/null +++ b/src/vhdl/scanner.ads @@ -0,0 +1,120 @@ +-- VHDL lexical scanner. +-- Copyright (C) 2002 - 2014 Tristan Gingold +-- +-- GHDL is free software; you can redistribute it and/or modify it under +-- the terms of the GNU General Public License as published by the Free +-- Software Foundation; either version 2, or (at your option) any later +-- version. +-- +-- GHDL is distributed in the hope that it will be useful, but WITHOUT ANY +-- WARRANTY; without even the implied warranty of MERCHANTABILITY or +-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +-- for more details. +-- +-- You should have received a copy of the GNU General Public License +-- along with GHDL; see the file COPYING. If not, write to the Free +-- Software Foundation, 59 Temple Place - Suite 330, Boston, MA +-- 02111-1307, USA. +with Types; use Types; +with Tokens; use Tokens; + +package Scanner is + -- Global variables + -- The token that was just scanned. + -- When the token was eaten, you can call invalidate_current_token to + -- set it to tok_invalid. + -- Current_token should not be written outside of scan package. + -- It can be replaced by a function call. + Current_Token: Token_Type := Tok_Invalid; + + -- Simply set current_token to tok_invalid. + procedure Invalidate_Current_Token; + pragma Inline (Invalidate_Current_Token); + + -- When CURRENT_TOKEN is an tok_identifier, tok_char or tok_string, + -- its name_id can be got via this function. + function Current_Identifier return Name_Id; + pragma Inline (Current_Identifier); + + -- Get current string identifier and length. + function Current_String_Id return String_Id; + function Current_String_Length return Nat32; + pragma Inline (Current_String_Id); + pragma Inline (Current_String_Length); + + -- Set Current_identifier to null_identifier. + -- Can be used to catch bugs. + procedure Invalidate_Current_Identifier; + pragma Inline (Invalidate_Current_Identifier); + + -- When CURRENT_TOKEN is tok_integer, returns the value. + -- When CURRENT_TOKEN is tok_bit_string, returns the base. + function Current_Iir_Int64 return Iir_Int64; + pragma Inline (Current_Iir_Int64); + + -- When CURRENT_TOKEN is tok_real, it returns the value. + function Current_Iir_Fp64 return Iir_Fp64; + pragma Inline (Current_Iir_Fp64); + + -- Advances the lexical analyser. Put a new token into current_token. + procedure Scan; + + -- Initialize the scanner with file SOURCE_FILE. + procedure Set_File (Source_File : Source_File_Entry); + + procedure Set_Current_Position (Position: Source_Ptr); + + -- Finalize the scanner. + procedure Close_File; + + -- If true comments are reported as a token. + Flag_Comment : Boolean := False; + + -- If true newlines are reported as a token. + Flag_Newline : Boolean := False; + + -- If true also scan PSL tokens. + Flag_Psl : Boolean := False; + + -- If true handle PSL embedded in comments: '-- psl' is ignored. + Flag_Psl_Comment : Boolean := False; + + -- If true, ignore '--'. This is automatically set when Flag_Psl_Comment + -- is true and a starting PSL keyword has been identified. + -- Must be reset to false by the parser. + Flag_Scan_In_Comment : Boolean := False; + + -- If true scan for keywords in comments. Must be enabled if + -- Flag_Psl_Comment is true. + Flag_Comment_Keyword : Boolean := False; + + -- If the next character is '!', eat it and return True, otherwise return + -- False (used by PSL). + function Scan_Exclam_Mark return Boolean; + + -- If the next character is '_', eat it and return True, otherwise return + -- False (used by PSL). + function Scan_Underscore return Boolean; + + -- Get the current location, or the location of the current token. + -- Since a token cannot spread over lines, file and line of the current + -- token are the same as those of the current position. + function Get_Current_File return Name_Id; + function Get_Current_Source_File return Source_File_Entry; + function Get_Current_Line return Natural; + function Get_Current_Column return Natural; + function Get_Token_Location return Location_Type; + function Get_Token_Column return Natural; + function Get_Token_Position return Source_Ptr; + function Get_Position return Source_Ptr; + + -- Convert (canonicalize) an identifier stored in name_buffer/name_length. + -- Upper case letters are converted into lower case. + -- Lexical checks are performed. + -- This procedure is not used by Scan, but should be used for identifiers + -- given in the command line. + -- Errors are directly reported through error_msg_option. + -- Also, Vhdl_Std should be set. + procedure Convert_Identifier; + +end Scanner; |