Add a command line parsing procedure

Rakefile

@@ -44,11 +44,12 @@ end
       .partition { |f| f.end_with? '.elna' }
 
     File.open t.name, 'w' do |output|
-      puts
-      puts(compiler * ' ')
+      compiler_command = compiler + sources
 
-      Open3.popen2(*compiler) do |cl_in, cl_out|
-        cl_in.write File.read(*sources)
+      puts
+      puts(compiler_command * ' ')
+
+      Open3.popen2(*compiler_command) do |cl_in, cl_out|
         cl_in.close
 
         IO.copy_stream cl_out, output
@@ -87,11 +88,11 @@ task default: 'source/Compiler.elna'
 task :default do |t|
   exe, previous_output, source = t.prerequisites
 
-  cat_arguments = ['cat', source]
+  exe_arguments = [exe, source]
   diff_arguments = ['diff', '-Nur', '--text', previous_output, '-']
 
-  puts [cat_arguments * ' ', exe, diff_arguments * ' '].join(' | ')
-  Open3.pipeline(cat_arguments, exe, diff_arguments)
+  puts [exe, diff_arguments * ' '].join(' | ')
+  Open3.pipeline exe_arguments, diff_arguments
 end
 
 task :backport do
@@ -104,7 +105,7 @@ task :backport do
     source
       .gsub(/^(var|type|const|begin)/) { |match| match.upcase }
       .gsub(/^[[:alnum:]]* ?module/) { |match| match.upcase }
-      .gsub(/\b(record|nil|or)\b/) { |match| match.upcase }
+      .gsub(/\b(record|nil|or|false|true)\b/) { |match| match.upcase }
       .gsub(/proc\(/, 'PROCEDURE(')
       .gsub(/ & /, ' AND ')
       .gsub(/ -> /, ': ')

source/CommandLineInterface.def

@@ -0,0 +1,15 @@
+DEFINITION MODULE CommandLineInterface;
+
+FROM Common IMPORT ShortString;
+
+TYPE
+  CommandLine = RECORD
+    input: ShortString;
+    lex: BOOLEAN;
+    parse: BOOLEAN
+  END;
+  PCommandLine = POINTER TO CommandLine;
+
+PROCEDURE parse_command_line(): PCommandLine;
+
+END CommandLineInterface.

source/CommandLineInterface.elna

@@ -0,0 +1,75 @@
+implementation module CommandLineInterface;
+
+from SYSTEM import ADR, TSIZE;
+
+from Args import GetArg, Narg;
+from FIO import WriteString, WriteChar, WriteLine, StdErr;
+from Storage import ALLOCATE;
+from Strings import CompareStr, Length;
+from MemUtils import MemZero;
+
+from Common import ShortString;
+
+proc parse_command_line() -> PCommandLine;
+var
+  parameter: ShortString;
+  i: CARDINAL;
+  result: PCommandLine;
+  parsed: BOOLEAN;
+begin
+  i := 1;
+  ALLOCATE(result, TSIZE(CommandLine));
+  result^.lex := false;
+  result^.parse := false;
+  MemZero(ADR(result^.input), 256);
+
+  while (i < Narg()) & (result <> nil) do
+    parsed := GetArg(parameter, i);
+    parsed := false;
+
+    if CompareStr(parameter, '--lex') = 0 then
+      parsed := true;
+      result^.lex := true
+    end;
+    if CompareStr(parameter, '--parse') = 0 then
+      parsed := true;
+      result^.parse := true
+    end;
+    if parameter[0] <> '-' then
+      parsed := true;
+
+      if Length(result^.input) > 0 then
+        WriteString(StdErr, 'Fatal error: only one source file can be compiled at once. First given "');
+        WriteString(StdErr, result^.input);
+        WriteString(StdErr, '", then "');
+        WriteString(StdErr, parameter);
+        WriteString(StdErr, '".');
+        WriteLine(StdErr);
+        result := nil
+      end;
+      if result <> nil then
+        result^.input := parameter
+      end
+    end;
+    if parsed = false then
+      WriteString(StdErr, 'Fatal error: unknown command line options: ');
+
+      WriteString(StdErr, parameter);
+      WriteChar(StdErr, '.');
+      WriteLine(StdErr);
+
+      result := nil
+    end;
+
+    i := i + 1
+  end;
+  if (result <> nil) & (Length(result^.input) = 0) then
+    WriteString(StdErr, 'Fatal error: no input files.');
+    WriteLine(StdErr);
+    result := nil
+  end;
+
+  return result
+end;
+
+end CommandLineInterface.

source/Common.def

@@ -0,0 +1,8 @@
+DEFINITION MODULE Common;
+
+TYPE
+  ShortString = ARRAY[0..255] OF CHAR;
+  Identifier = ARRAY[1..256] OF CHAR;
+  PIdentifier = POINTER TO Identifier;
+
+END Common.

source/Common.elna

@@ -0,0 +1,3 @@
+implementation module Common;
+
+end Common.

source/Compiler.elna

@@ -1,18 +1,51 @@
 module Compiler;
 
-from FIO import StdIn;
+from FIO import Close, IsNoError, File, OpenToRead, StdErr, StdOut, WriteLine, WriteString;
 from SYSTEM import ADR;
+from M2RTS import HALT, ExitOnHalt;
 
 from Lexer import Lexer, lexer_destroy, lexer_initialize;
 from Transpiler import transpile;
+from CommandLineInterface import PCommandLine, parse_command_line;
 
+var
+  command_line: PCommandLine;
+
+proc compile_from_stream();
 var
   lexer: Lexer;
+  source_input: File;
+begin
+  source_input := OpenToRead(command_line^.input);
+
+  if IsNoError(source_input) = false then
+    WriteString(StdErr, 'Fatal error: failed to read the input file "');
+    WriteString(StdErr, command_line^.input);
+    WriteString(StdErr, '".');
+    WriteLine(StdErr);
+
+    ExitOnHalt(2)
+  end;
+  if IsNoError(source_input) then
+    lexer_initialize(ADR(lexer), source_input);
+
+    transpile(ADR(lexer), StdOut);
+
+    lexer_destroy(ADR(lexer));
+
+    Close(source_input)
+  end
+end;
 
 begin
-  lexer_initialize(ADR(lexer), StdIn);
+  ExitOnHalt(0);
+  command_line := parse_command_line();
 
-  transpile(ADR(lexer));
-
-  lexer_destroy(ADR(lexer))
+  if command_line <> nil then
+    compile_from_stream()
+  end;
+  if command_line = nil then
+    ExitOnHalt(1)
+  end;
+  HALT()
 end Compiler.

source/Lexer.def

@@ -2,6 +2,8 @@ DEFINITION MODULE Lexer;
 
 FROM FIO IMPORT File;
 
+FROM Common IMPORT Identifier;
+
 TYPE
   PLexerBuffer = POINTER TO CHAR;
   Lexer = RECORD
@@ -81,7 +83,7 @@ TYPE
   LexerToken = RECORD
     CASE kind: LexerKind OF
       lexerKindBoolean: booleanKind: BOOLEAN |
-      lexerKindIdentifier: identifierKind: ARRAY[1..256] OF CHAR
+      lexerKindIdentifier: identifierKind: Identifier
     END
   END;
   PLexerToken = POINTER TO LexerToken;

source/Lexer.elna

@@ -217,7 +217,7 @@ var
   index: CARDINAL;
 begin
   index := 0;
-  result := TRUE;
+  result := true;
 
   while (index < Length(Keyword)) & (TokenStart <> TokenEnd) & result DO
     result := (Keyword[index] = TokenStart^) or (Lower(Keyword[index]) = TokenStart^);
@@ -409,11 +409,11 @@ begin
   end;
   if compare_keyword('TRUE', lexer^.Start, lexer^.Current) then
     token^.kind := lexerKindBoolean;
-    token^.booleanKind := TRUE
+    token^.booleanKind := true
   end;
   if compare_keyword('FALSE', lexer^.Start, lexer^.Current) then
     token^.kind := lexerKindBoolean;
-    token^.booleanKind := FALSE
+    token^.booleanKind := false
   end
 end;
 

source/Parser.def

@@ -0,0 +1,46 @@
+DEFINITION MODULE Parser;
+
+FROM Common IMPORT Identifier, PIdentifier;
+
+TYPE
+  AstConstantDeclaration = RECORD
+  END;
+  PAstConstantDeclaration = POINTER TO AstConstantDeclaration;
+  PPAstConstantDeclaration = POINTER TO PAstConstantDeclaration;
+
+  AstTypeExpressionKind = (
+    astTypeExpressionKindNamed,
+    astTypeExpressionKindRecord,
+    astTypeExpressionKindEnumeration,
+    astTypeExpressionKindArray,
+    astTypeExpressionKindPointer,
+    astTypeExpressionKindProcedure
+  );
+  AstTypeExpression = RECORD
+    CASE kind: AstTypeExpressionKind OF
+      astTypeExpressionKindNamed: name: Identifier |
+      astTypeExpressionKindEnumeration: cases: PIdentifier
+    END
+  END;
+  PAstTypeExpression = POINTER TO AstTypeExpression;
+
+  AstTypeDeclaration = RECORD
+    identifier: Identifier;
+    type_expression: PAstTypeExpression
+  END;
+  PAstTypeDeclaration = POINTER TO AstTypeDeclaration;
+  PPAstTypeDeclaration = POINTER TO PAstTypeDeclaration;
+
+  AstVariableDeclaration = RECORD
+  END;
+  PAstVariableDeclaration = POINTER TO AstVariableDeclaration;
+  PPAstVariableDeclaration = POINTER TO PAstVariableDeclaration;
+
+  AstModule = RECORD
+    constants: PPAstConstantDeclaration;
+    types: PPAstTypeDeclaration;
+    variables: PPAstVariableDeclaration
+  END;
+  PAstModule = POINTER TO AstModule;
+
+END Parser.

source/Parser.elna

@@ -0,0 +1,3 @@
+implementation module Parser;
+
+end Parser.

source/Transpiler.def

@@ -1,7 +1,17 @@
 DEFINITION MODULE Transpiler;
 
-FROM Lexer IMPORT PLexer;
+FROM FIO IMPORT File;
 
-PROCEDURE transpile(ALexer: PLexer);
+FROM Lexer IMPORT PLexer, Lexer;
+
+TYPE
+  TranspilerContext = RECORD
+    indentation: CARDINAL;
+    output: File;
+    lexer: PLexer
+  END;
+  PTranspilerContext = POINTER TO TranspilerContext;
+
+PROCEDURE transpile(lexer: PLexer; output: File);
 
 END Transpiler.