990 lines
25 KiB
Plaintext
990 lines
25 KiB
Plaintext
const
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SEEK_SET* = 0;
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SEEK_CUR* = 1;
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SEEK_END* = 2;
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TOKEN_IDENTIFIER* = 1;
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TOKEN_IF* = 2;
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TOKEN_THEN* = 3;
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TOKEN_ELSE* = 4;
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TOKEN_ELSIF* = 5;
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TOKEN_WHILE* = 6;
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TOKEN_DO* = 7;
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TOKEN_PROC* = 8;
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TOKEN_BEGIN* = 9;
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TOKEN_END* = 10;
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TOKEN_EXTERN* = 11;
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TOKEN_CONST* = 12;
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TOKEN_VAR* = 13;
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TOKEN_ARRAY* = 14;
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TOKEN_OF* = 15;
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TOKEN_TYPE* = 16;
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TOKEN_RECORD* = 17;
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TOKEN_UNION* = 18;
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TOKEN_POINTER* = 19;
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TOKEN_TO* = 20;
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TOKEN_BOOLEAN* = 21;
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TOKEN_NIL* = 22;
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TOKEN_AND* = 23;
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TOKEN_OR* = 24;
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TOKEN_NOT* = 25;
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TOKEN_RETURN* = 26;
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TOKEN_CAST* = 27;
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TOKEN_SHIFT_LEFT* = 28;
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TOKEN_SHIFT_RIGHT* = 29;
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TOKEN_LEFT_PAREN* = 30;
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TOKEN_RIGHT_PAREN* = 31;
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TOKEN_LEFT_SQUARE* = 32;
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TOKEN_RIGHT_SQUARE* = 33;
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TOKEN_GREATER_EQUAL* = 34;
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TOKEN_LESS_EQUAL* = 35;
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TOKEN_GREATER_THAN* = 36;
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TOKEN_LESS_THAN* = 37;
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TOKEN_NOT_EQUAL* = 38;
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TOKEN_EQUAL* = 39;
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TOKEN_SEMICOLON* = 40;
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TOKEN_DOT* = 41;
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TOKEN_COMMA* = 42;
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TOKEN_PLUS* = 43;
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TOKEN_MINUS* = 44;
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TOKEN_MULTIPLICATION* = 45;
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TOKEN_DIVISION* = 46;
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TOKEN_REMAINDER* = 47;
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TOKEN_ASSIGNMENT* = 48;
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TOKEN_COLON* = 49;
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TOKEN_HAT* = 50;
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TOKEN_AT* = 51;
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TOKEN_COMMENT* = 52;
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TOKEN_INTEGER* = 53;
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TOKEN_WORD* = 54;
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TOKEN_CHARACTER* = 55;
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TOKEN_STRING* = 56;
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TOKEN_DEFER* = 57;
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TOKEN_EXCLAMATION* = 58;
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TOKEN_ARROW = 59;
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type
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Position* = record
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line: Word;
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column: Word
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end;
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Location* = record
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first: Position;
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last: Position
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end;
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SourceFile* = record
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buffer: [1024]Char;
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handle: ^FILE;
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size: Word;
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index: Word
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end;
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FILE* = record end;
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StringBuffer* = record
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data: ^Byte;
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size: Word;
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capacity: Word
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end;
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SourceCode = record
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position: Position;
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input: ^Byte;
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empty: proc(^Byte) -> Bool;
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advance: proc(^Byte);
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head: proc(^Byte) -> Char
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end;
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Token* = record
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kind: Int;
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value: union
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int_value: Int;
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string: String;
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boolean_value: Bool;
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char_value: Char
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end;
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location: Location
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end;
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CommandLine* = record
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input: ^Char;
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tokenize: Bool;
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syntax_tree: Bool
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end;
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(*
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External procedures.
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*)
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proc fopen(pathname: ^Char, mode: ^Char) -> ^FILE; extern
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proc fclose(stream: ^FILE) -> Int; extern
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proc fseek(stream: ^FILE, off: Int, whence: Int) -> Int; extern
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proc rewind(stream: ^FILE); extern
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proc ftell(stream: ^FILE) -> Int; extern
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proc fread(ptr: ^Byte, size: Word, nmemb: Word, stream: ^FILE) -> Word; extern
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proc write(fd: Int, buf: ^Byte, Word: Int) -> Int; extern
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proc malloc(size: Word) -> ^Byte; extern
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proc free(ptr: ^Byte); extern
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proc calloc(nmemb: Word, size: Word) -> ^Byte; extern
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proc realloc(ptr: ^Byte, size: Word) -> ^Byte; extern
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proc memset(ptr: ^Char, c: Int, n: Int) -> ^Char; extern
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proc strcmp(s1: ^Char, s2: ^Char) -> Int; extern
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proc strncmp(s1: ^Char, s2: ^Char, n: Word) -> Int; extern
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proc strncpy(dst: ^Char, src: ^Char, dsize: Word) -> ^Char; extern
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proc strcpy(dst: ^Char, src: ^Char) -> ^Char; extern
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proc strlen(ptr: ^Char) -> Word; extern
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proc perror(s: ^Char); extern
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proc exit(code: Int) -> !; extern
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(*
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Standard procedures.
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*)
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proc reallocarray(ptr: ^Byte, n: Word, size: Word) -> ^Byte;
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begin
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return realloc(ptr, n * size)
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end
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proc write_s(value: String);
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begin
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write(0, cast(value.ptr: ^Byte), cast(value.length: Int))
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end
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proc write_z(value: ^Char);
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begin
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write(0, cast(value: ^Byte), cast(strlen(value): Int))
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end
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proc write_b(value: Bool);
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begin
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if value then
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write_s("true")
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else
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write_s("false")
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end
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end
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proc write_c(value: Char);
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begin
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write(0, cast(@value: ^Byte), 1)
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end
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proc write_i(value: Int);
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var
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digit: Int;
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n: Word;
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buffer: [10]Char;
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begin
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n := 10u;
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if value = 0 then
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write_c('0')
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end;
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while value <> 0 do
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digit := value % 10;
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value := value / 10;
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buffer[n] := cast(cast('0': Int) + digit: Char);
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n := n - 1u
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end;
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while n < 10u do
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n := n + 1u;
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write_c(buffer[n])
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end
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end
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proc write_u(value: Word);
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begin
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write_i(cast(value: Int))
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end
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proc is_digit(c: Char) -> Bool;
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begin
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return cast(c: Int) >= cast('0': Int) & cast(c: Int) <= cast('9': Int)
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end
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proc is_alpha(c: Char) -> Bool;
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begin
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return cast(c: Int) >= cast('A': Int) & cast(c: Int) <= cast('z': Int)
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end
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proc is_alnum(c: Char) -> Bool;
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begin
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return is_digit(c) | is_alpha(c)
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end
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proc is_space(c: Char) -> Bool;
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begin
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return c = ' ' | c = '\n' | c = '\t'
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end
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proc substring(string: String, start: Word, count: Word) -> String;
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begin
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return String(string.ptr + start, count)
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end
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proc open_substring(string: String, start: Word) -> String;
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begin
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return substring(string, start, string.length - start)
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end
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proc string_dup(origin: String) -> String;
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var
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copy: ^Char;
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begin
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copy := cast(malloc(origin.length): ^Char);
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strncpy(copy, origin.ptr, origin.length);
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return String(copy, origin.length)
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end
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proc string_buffer_new() -> StringBuffer;
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var
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result: StringBuffer;
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begin
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result.capacity := 64u;
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result.data := malloc(result.capacity);
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result.size := 0u;
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return result
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end
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proc string_buffer_push(buffer: ^StringBuffer, char: Char);
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begin
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if buffer^.size >= buffer^.capacity then
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buffer^.capacity := buffer^.capacity + 1024u;
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buffer^.data := realloc(buffer^.data, buffer^.capacity)
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end;
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(buffer^.data + buffer^.size)^ := cast(char: Byte);
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buffer^.size := buffer^.size + 1u
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end
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proc string_buffer_pop(buffer: ^StringBuffer, count: Word);
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begin
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buffer^.size := buffer^.size - count
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end
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proc string_buffer_clear(buffer: ^StringBuffer) -> String;
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var
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result: String;
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begin
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result := String(cast(buffer^.data: ^Char), buffer^.size);
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buffer^.size := 0u;
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return result
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end
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(*
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End of standard procedures.
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*)
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proc make_position() -> Position;
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begin
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return Position(1u, 1u)
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end
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proc read_source(filename: ^Char) -> ^SourceFile;
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var
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result: ^SourceFile;
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file_handle: ^FILE;
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begin
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file_handle := fopen(filename, "rb\0".ptr);
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if file_handle <> nil then
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result := cast(malloc(#size(SourceFile)): ^SourceFile);
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result^.handle := file_handle;
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result^.size := 0u;
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result^.index := 1u
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end;
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return result
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end
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proc escape_char(escape: Char, result: ^Char) -> Bool;
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var
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successful: Bool;
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begin
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if escape = 'n' then
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result^ := '\n';
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successful := true;
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elsif escape = 'a' then
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result^ := '\a';
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successful := true
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elsif escape = 'b' then
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result^ := '\b';
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successful := true
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elsif escape = 't' then
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result^ := '\t';
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successful := true
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elsif escape = 'f' then
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result^ := '\f';
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successful := true
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elsif escape = 'r' then
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result^ := '\r';
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successful := true
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elsif escape = 'v' then
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result^ := '\v';
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successful := true
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elsif escape = '\\' then
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result^ := '\\';
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successful := true
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elsif escape = '\'' then
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result^ := '\'';
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successful := true
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elsif escape = '"' then
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result^ := '"';
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successful := true
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elsif escape = '?' then
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result^ := '\?';
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successful := true
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elsif escape = '0' then
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result^ := '\0';
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successful := true
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else
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successful := false
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end;
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return successful
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end
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proc source_file_empty(source_input: ^Byte) -> Bool;
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var
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source_file: ^SourceFile;
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begin
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source_file := cast(source_input: ^SourceFile);
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if source_file^.index > source_file^.size then
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source_file^.size := fread(cast(@source_file^.buffer: ^Byte), 1u, 1024u, source_file^.handle);
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source_file^.index := 1u
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end;
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return source_file^.size = 0u
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end
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proc source_file_head(source_input: ^Byte) -> Char;
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var
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source_file: ^SourceFile;
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begin
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source_file := cast(source_input: ^SourceFile);
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return source_file^.buffer[source_file^.index]
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end
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proc source_file_advance(source_input: ^Byte);
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var
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source_file: ^SourceFile;
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begin
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source_file := cast(source_input: ^SourceFile);
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source_file^.index := source_file^.index + 1u
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end
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proc source_code_empty(source_code: ^SourceCode) -> Bool;
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begin
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return source_code^.empty(source_code^.input)
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end
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proc source_code_head(source_code: SourceCode) -> Char;
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begin
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return source_code.head(source_code.input)
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end
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proc source_code_advance(source_code: ^SourceCode);
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begin
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source_code^.advance(source_code^.input);
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source_code^.position.column := source_code^.position.column
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end
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proc source_code_break(source_code: ^SourceCode);
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begin
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source_code^.position.line := source_code^.position.line + 1u;
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source_code^.position.column := 0u
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end
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proc source_code_expect(source_code: ^SourceCode, expected: Char) -> Bool;
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begin
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return ~source_code_empty(source_code) & source_code_head(source_code^) = expected
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end
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proc skip_spaces(source_code: ^SourceCode);
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begin
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while ~source_code_empty(source_code) & is_space(source_code_head(source_code^)) do
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if source_code_head(source_code^) = '\n' then
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source_code_break(source_code)
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end;
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source_code_advance(source_code)
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end
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end
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proc is_ident(char: Char) -> Bool;
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begin
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return is_alnum(char) | char = '_'
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end
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proc lex_identifier(source_code: ^SourceCode, token_content: ^StringBuffer);
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var
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content_length: Word;
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begin
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while ~source_code_empty(source_code) & is_ident(source_code_head(source_code^)) do
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string_buffer_push(token_content, source_code_head(source_code^));
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source_code_advance(source_code)
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end
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end
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proc lex_comment(source_code: ^SourceCode, token_content: ^StringBuffer) -> Bool;
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var
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trailing: Word;
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begin
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trailing := 0u;
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while ~source_code_empty(source_code) & trailing < 2u do
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if source_code_head(source_code^) = '*' then
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string_buffer_push(token_content, '*');
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trailing := 1u
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elsif source_code_head(source_code^) = ')' & trailing = 1u then
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string_buffer_pop(token_content, 1u);
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trailing := 2u
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else
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string_buffer_push(token_content, source_code_head(source_code^));
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trailing := 0u
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end;
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source_code_advance(source_code)
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end;
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return trailing = 2u
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end
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proc lex_character(source_code: ^SourceCode, token_content: ^Char) -> Bool;
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var
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successful: Bool;
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begin
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successful := ~source_code_empty(source_code);
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if successful then
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if source_code_head(source_code^) = '\\' then
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source_code_advance(source_code);
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successful := ~source_code_empty(source_code) & escape_char(source_code_head(source_code^), token_content)
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else
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token_content^ := source_code_head(source_code^);
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successful := true
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end
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end;
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if successful then
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source_code_advance(source_code)
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end;
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return successful
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end
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proc lex_string(source_code: ^SourceCode, token_content: ^StringBuffer) -> Bool;
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var
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token_end, constructed_string: ^Char;
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token_length: Word;
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is_valid: Bool;
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next_char: Char;
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begin
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is_valid := true;
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while is_valid & ~source_code_empty(source_code) & source_code_head(source_code^) <> '"' do
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is_valid := lex_character(source_code, @next_char);
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if is_valid then
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string_buffer_push(token_content, next_char)
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end
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end;
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if is_valid & source_code_expect(source_code, '"') then
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source_code_advance(source_code)
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else
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is_valid := false
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end;
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return is_valid
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end
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proc lex_number(source_code: ^SourceCode, token_content: ^Int);
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begin
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token_content^ := 0;
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while ~source_code_empty(source_code) & is_digit(source_code_head(source_code^)) do
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token_content^ := token_content^ * 10 + (cast(source_code_head(source_code^): Int) - cast('0': Int));
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source_code_advance(source_code)
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end
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end
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proc print_tokens(tokens: ^Token, tokens_size: Word);
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var
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current_token: ^Token;
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i: Word;
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begin
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i := 0u;
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while i < tokens_size do
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current_token := tokens + i;
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if current_token^.kind = TOKEN_IF then
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write_s("IF")
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elsif current_token^.kind = TOKEN_THEN then
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write_s("THEN")
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elsif current_token^.kind = TOKEN_ELSE then
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write_s("ELSE")
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elsif current_token^.kind = TOKEN_ELSIF then
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write_s("ELSIF")
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elsif current_token^.kind = TOKEN_WHILE then
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write_s("WHILE")
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elsif current_token^.kind = TOKEN_DO then
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write_s("DO")
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elsif current_token^.kind = TOKEN_PROC then
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write_s("PROC")
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elsif current_token^.kind = TOKEN_BEGIN then
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write_s("BEGIN")
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elsif current_token^.kind = TOKEN_END then
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write_s("END")
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elsif current_token^.kind = TOKEN_EXTERN then
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write_s("EXTERN")
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elsif current_token^.kind = TOKEN_CONST then
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write_s("CONST")
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elsif current_token^.kind = TOKEN_VAR then
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write_s("VAR")
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elsif current_token^.kind = TOKEN_ARRAY then
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write_s("ARRAY")
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elsif current_token^.kind = TOKEN_OF then
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write_s("OF")
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elsif current_token^.kind = TOKEN_TYPE then
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write_s("TYPE")
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elsif current_token^.kind = TOKEN_RECORD then
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write_s("RECORD")
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elsif current_token^.kind = TOKEN_UNION then
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write_s("UNION")
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elsif current_token^.kind = TOKEN_POINTER then
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write_s("POINTER")
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elsif current_token^.kind = TOKEN_TO then
|
|
write_s("TO")
|
|
elsif current_token^.kind = TOKEN_BOOLEAN then
|
|
write_s("BOOLEAN<");
|
|
write_b(current_token^.value.boolean_value);
|
|
write_c('>')
|
|
elsif current_token^.kind = TOKEN_NIL then
|
|
write_s("NIL")
|
|
elsif current_token^.kind = TOKEN_AND then
|
|
write_s("AND")
|
|
elsif current_token^.kind = TOKEN_OR then
|
|
write_s("OR")
|
|
elsif current_token^.kind = TOKEN_NOT then
|
|
write_s("NOT")
|
|
elsif current_token^.kind = TOKEN_RETURN then
|
|
write_s("RETURN")
|
|
elsif current_token^.kind = TOKEN_CAST then
|
|
write_s("CAST")
|
|
elsif current_token^.kind = TOKEN_SHIFT_LEFT then
|
|
write_s("<<")
|
|
elsif current_token^.kind = TOKEN_SHIFT_RIGHT then
|
|
write_s(">>")
|
|
elsif current_token^.kind = TOKEN_IDENTIFIER then
|
|
write_c('<');
|
|
write_s(current_token^.value.string);
|
|
write_c('>')
|
|
elsif current_token^.kind = TOKEN_LEFT_PAREN then
|
|
write_s("(")
|
|
elsif current_token^.kind = TOKEN_RIGHT_PAREN then
|
|
write_s(")")
|
|
elsif current_token^.kind = TOKEN_LEFT_SQUARE then
|
|
write_s("[")
|
|
elsif current_token^.kind = TOKEN_RIGHT_SQUARE then
|
|
write_s("]")
|
|
elsif current_token^.kind = TOKEN_GREATER_EQUAL then
|
|
write_s(">=")
|
|
elsif current_token^.kind = TOKEN_LESS_EQUAL then
|
|
write_s("<=")
|
|
elsif current_token^.kind = TOKEN_GREATER_THAN then
|
|
write_s(">")
|
|
elsif current_token^.kind = TOKEN_LESS_THAN then
|
|
write_s("<")
|
|
elsif current_token^.kind = TOKEN_EQUAL then
|
|
write_s("=")
|
|
elsif current_token^.kind = TOKEN_NOT_EQUAL then
|
|
write_s("<>")
|
|
elsif current_token^.kind = TOKEN_SEMICOLON then
|
|
write_c(';')
|
|
elsif current_token^.kind = TOKEN_DOT then
|
|
write_c('.')
|
|
elsif current_token^.kind = TOKEN_COMMA then
|
|
write_c(',')
|
|
elsif current_token^.kind = TOKEN_PLUS then
|
|
write_c('+')
|
|
elsif current_token^.kind = TOKEN_MINUS then
|
|
write_c('-')
|
|
elsif current_token^.kind = TOKEN_MULTIPLICATION then
|
|
write_c('*')
|
|
elsif current_token^.kind = TOKEN_DIVISION then
|
|
write_c('/')
|
|
elsif current_token^.kind = TOKEN_REMAINDER then
|
|
write_c('%')
|
|
elsif current_token^.kind = TOKEN_ASSIGNMENT then
|
|
write_s(":=")
|
|
elsif current_token^.kind = TOKEN_COLON then
|
|
write_c(':')
|
|
elsif current_token^.kind = TOKEN_HAT then
|
|
write_c('^')
|
|
elsif current_token^.kind = TOKEN_AT then
|
|
write_c('@')
|
|
elsif current_token^.kind = TOKEN_COMMENT then
|
|
write_s("(* COMMENT *)")
|
|
elsif current_token^.kind = TOKEN_INTEGER then
|
|
write_c('<');
|
|
write_i(current_token^.value.int_value);
|
|
write_c('>')
|
|
elsif current_token^.kind = TOKEN_WORD then
|
|
write_c('<');
|
|
write_i(current_token^.value.int_value);
|
|
write_s("u>")
|
|
elsif current_token^.kind = TOKEN_CHARACTER then
|
|
write_c('<');
|
|
write_i(cast(current_token^.value.char_value: Int));
|
|
write_s("c>")
|
|
elsif current_token^.kind = TOKEN_STRING then
|
|
write_s("\"...\"")
|
|
elsif current_token^.kind = TOKEN_DEFER then
|
|
write_s("DEFER")
|
|
elsif current_token^.kind = TOKEN_EXCLAMATION then
|
|
write_c('!')
|
|
elsif current_token^.kind = TOKEN_ARROW then
|
|
write_s("->")
|
|
else
|
|
write_s("UNKNOWN<");
|
|
write_i(current_token^.kind);
|
|
write_c('>')
|
|
end;
|
|
write_c(' ');
|
|
|
|
i := i + 1u;
|
|
end;
|
|
write_c('\n')
|
|
end
|
|
|
|
proc categorize_identifier(token_content: String) -> Token;
|
|
var
|
|
current_token: Token;
|
|
begin
|
|
if "if" = token_content then
|
|
current_token.kind := TOKEN_IF
|
|
elsif "then" = token_content then
|
|
current_token.kind := TOKEN_THEN
|
|
elsif "else" = token_content then
|
|
current_token.kind := TOKEN_ELSE
|
|
elsif "elsif" = token_content then
|
|
current_token.kind := TOKEN_ELSIF
|
|
elsif "while" = token_content then
|
|
current_token.kind := TOKEN_WHILE
|
|
elsif "do" = token_content then
|
|
current_token.kind := TOKEN_DO
|
|
elsif "proc" = token_content then
|
|
current_token.kind := TOKEN_PROC
|
|
elsif "begin" = token_content then
|
|
current_token.kind := TOKEN_BEGIN
|
|
elsif "end" = token_content then
|
|
current_token.kind := TOKEN_END
|
|
elsif "extern" = token_content then
|
|
current_token.kind := TOKEN_EXTERN
|
|
elsif "const" = token_content then
|
|
current_token.kind := TOKEN_CONST
|
|
elsif "var" = token_content then
|
|
current_token.kind := TOKEN_VAR
|
|
elsif "array" = token_content then
|
|
current_token.kind := TOKEN_ARRAY
|
|
elsif "of" = token_content then
|
|
current_token.kind := TOKEN_OF
|
|
elsif "type" = token_content then
|
|
current_token.kind := TOKEN_TYPE
|
|
elsif "record" = token_content then
|
|
current_token.kind := TOKEN_RECORD
|
|
elsif "union" = token_content then
|
|
current_token.kind := TOKEN_UNION
|
|
elsif "pointer" = token_content then
|
|
current_token.kind := TOKEN_POINTER
|
|
elsif "to" = token_content then
|
|
current_token.kind := TOKEN_TO
|
|
elsif "true" = token_content then
|
|
current_token.kind := TOKEN_BOOLEAN;
|
|
current_token.value.boolean_value := true
|
|
elsif "false" = token_content then
|
|
current_token.kind := TOKEN_BOOLEAN;
|
|
current_token.value.boolean_value := false
|
|
elsif "nil" = token_content then
|
|
current_token.kind := TOKEN_NIL
|
|
elsif "and" = token_content then
|
|
current_token.kind := TOKEN_AND
|
|
elsif "or" = token_content then
|
|
current_token.kind := TOKEN_OR
|
|
elsif "not" = token_content then
|
|
current_token.kind := TOKEN_NOT
|
|
elsif "return" = token_content then
|
|
current_token.kind := TOKEN_RETURN
|
|
elsif "cast" = token_content then
|
|
current_token.kind := TOKEN_CAST
|
|
elsif "defer" = token_content then
|
|
current_token.kind := TOKEN_DEFER
|
|
else
|
|
current_token.kind := TOKEN_IDENTIFIER;
|
|
current_token.value.string := string_dup(token_content)
|
|
end;
|
|
|
|
return current_token
|
|
end
|
|
|
|
proc tokenize(source_code: SourceCode, tokens_size: ^Word) -> ^Token;
|
|
var
|
|
tokens, current_token: ^Token;
|
|
first_char: Char;
|
|
token_buffer: StringBuffer;
|
|
begin
|
|
tokens_size^ := 0u;
|
|
tokens := nil;
|
|
token_buffer := string_buffer_new();
|
|
|
|
skip_spaces(@source_code);
|
|
|
|
while ~source_code_empty(@source_code) do
|
|
tokens := cast(reallocarray(cast(tokens: ^Byte), tokens_size^ + 1u, #size(Token)): ^Token);
|
|
current_token := tokens + tokens_size^;
|
|
first_char := source_code_head(source_code);
|
|
|
|
if is_alpha(first_char) | first_char = '_' then
|
|
lex_identifier(@source_code, @token_buffer);
|
|
current_token^ := categorize_identifier(string_buffer_clear(@token_buffer))
|
|
elsif is_digit(first_char) then
|
|
lex_number(@source_code, @current_token^.value.int_value);
|
|
|
|
if source_code_expect(@source_code, 'u') then
|
|
current_token^.kind := TOKEN_WORD;
|
|
source_code_advance(@source_code)
|
|
else
|
|
current_token^.kind := TOKEN_INTEGER
|
|
end
|
|
elsif first_char = '(' then
|
|
source_code_advance(@source_code);
|
|
|
|
if source_code_empty(@source_code) then
|
|
current_token^.kind := TOKEN_LEFT_PAREN
|
|
elsif source_code_head(source_code) = '*' then
|
|
source_code_advance(@source_code);
|
|
|
|
if lex_comment(@source_code, @token_buffer) then
|
|
current_token^.value.string := string_dup(string_buffer_clear(@token_buffer));
|
|
current_token^.kind := TOKEN_COMMENT
|
|
else
|
|
current_token^.kind := 0
|
|
end
|
|
else
|
|
current_token^.kind := TOKEN_LEFT_PAREN
|
|
end
|
|
elsif first_char = ')' then
|
|
current_token^.kind := TOKEN_RIGHT_PAREN;
|
|
source_code_advance(@source_code)
|
|
elsif first_char = '\'' then
|
|
source_code_advance(@source_code);
|
|
|
|
if lex_character(@source_code, @current_token^.value.char_value) & source_code_expect(@source_code, '\'') then
|
|
current_token^.kind := TOKEN_CHARACTER;
|
|
source_code_advance(@source_code)
|
|
else
|
|
current_token^.kind := 0
|
|
end
|
|
elsif first_char = '"' then
|
|
source_code_advance(@source_code);
|
|
|
|
if lex_string(@source_code, @token_buffer) then
|
|
current_token^.kind := TOKEN_STRING;
|
|
current_token^.value.string := string_dup(string_buffer_clear(@token_buffer))
|
|
else
|
|
current_token^.kind := 0
|
|
end
|
|
elsif first_char = '[' then
|
|
current_token^.kind := TOKEN_LEFT_SQUARE;
|
|
source_code_advance(@source_code)
|
|
elsif first_char = ']' then
|
|
current_token^.kind := TOKEN_RIGHT_SQUARE;
|
|
source_code_advance(@source_code)
|
|
elsif first_char = '>' then
|
|
source_code_advance(@source_code);
|
|
|
|
if source_code_empty(@source_code) then
|
|
current_token^.kind := TOKEN_GREATER_THAN
|
|
elsif source_code_head(source_code) = '=' then
|
|
current_token^.kind := TOKEN_GREATER_EQUAL;
|
|
source_code_advance(@source_code)
|
|
elsif source_code_head(source_code) = '>' then
|
|
current_token^.kind := TOKEN_SHIFT_RIGHT;
|
|
source_code_advance(@source_code)
|
|
else
|
|
current_token^.kind := TOKEN_GREATER_THAN
|
|
end
|
|
elsif first_char = '<' then
|
|
source_code_advance(@source_code);
|
|
|
|
if source_code_empty(@source_code) then
|
|
current_token^.kind := TOKEN_LESS_THAN
|
|
elsif source_code_head(source_code) = '=' then
|
|
current_token^.kind := TOKEN_LESS_EQUAL;
|
|
source_code_advance(@source_code)
|
|
elsif source_code_head(source_code) = '<' then
|
|
current_token^.kind := TOKEN_SHIFT_LEFT;
|
|
source_code_advance(@source_code)
|
|
elsif source_code_head(source_code) = '>' then
|
|
current_token^.kind := TOKEN_NOT_EQUAL;
|
|
source_code_advance(@source_code)
|
|
else
|
|
current_token^.kind := TOKEN_LESS_THAN
|
|
end
|
|
elsif first_char = '=' then
|
|
current_token^.kind := TOKEN_EQUAL;
|
|
source_code_advance(@source_code)
|
|
elsif first_char = ';' then
|
|
current_token^.kind := TOKEN_SEMICOLON;
|
|
source_code_advance(@source_code)
|
|
elsif first_char = '.' then
|
|
current_token^.kind := TOKEN_DOT;
|
|
source_code_advance(@source_code)
|
|
elsif first_char = ',' then
|
|
current_token^.kind := TOKEN_COMMA;
|
|
source_code_advance(@source_code)
|
|
elsif first_char = '+' then
|
|
current_token^.kind := TOKEN_PLUS;
|
|
source_code_advance(@source_code)
|
|
elsif first_char = '-' then
|
|
source_code_advance(@source_code);
|
|
|
|
if source_code_empty(@source_code) then
|
|
current_token^.kind := TOKEN_MINUS
|
|
elsif source_code_head(source_code) = '>' then
|
|
current_token^.kind := TOKEN_ARROW;
|
|
source_code_advance(@source_code)
|
|
else
|
|
current_token^.kind := TOKEN_MINUS
|
|
end
|
|
elsif first_char = '*' then
|
|
current_token^.kind := TOKEN_MULTIPLICATION;
|
|
source_code_advance(@source_code)
|
|
elsif first_char = '/' then
|
|
current_token^.kind := TOKEN_DIVISION;
|
|
source_code_advance(@source_code)
|
|
elsif first_char = '%' then
|
|
current_token^.kind := TOKEN_REMAINDER;
|
|
source_code_advance(@source_code)
|
|
elsif first_char = ':' then
|
|
source_code_advance(@source_code);
|
|
|
|
if source_code_empty(@source_code) then
|
|
current_token^.kind := TOKEN_COLON
|
|
elsif source_code_head(source_code) = '=' then
|
|
current_token^.kind := TOKEN_ASSIGNMENT;
|
|
source_code_advance(@source_code)
|
|
else
|
|
current_token^.kind := TOKEN_COLON
|
|
end
|
|
elsif first_char = '^' then
|
|
current_token^.kind := TOKEN_HAT;
|
|
source_code_advance(@source_code)
|
|
elsif first_char = '@' then
|
|
current_token^.kind := TOKEN_AT;
|
|
source_code_advance(@source_code)
|
|
elsif first_char = '!' then
|
|
current_token^.kind := TOKEN_EXCLAMATION;
|
|
source_code_advance(@source_code)
|
|
else
|
|
current_token^.kind := 0;
|
|
source_code_advance(@source_code)
|
|
end;
|
|
|
|
if current_token^.kind <> 0 then
|
|
tokens_size^ := tokens_size^ + 1u;
|
|
skip_spaces(@source_code)
|
|
else
|
|
write_s("Lexical analysis error on \"");
|
|
write_c(first_char);
|
|
write_s("\".\n")
|
|
end
|
|
end;
|
|
|
|
return tokens
|
|
end
|
|
|
|
proc parse_command_line*(argc: Int, argv: ^^Char) -> ^CommandLine;
|
|
var
|
|
parameter: ^^Char;
|
|
i: Int;
|
|
result: ^CommandLine;
|
|
begin
|
|
i := 1;
|
|
result := cast(malloc(#size(CommandLine)): ^CommandLine);
|
|
result^.tokenize := false;
|
|
result^.syntax_tree := false;
|
|
result^.input := nil;
|
|
|
|
while i < argc do
|
|
parameter := argv + i;
|
|
|
|
if strcmp(parameter^, "--tokenize\0".ptr) = 0 then
|
|
result^.tokenize := true
|
|
elsif strcmp(parameter^, "--syntax-tree\0".ptr) = 0 then
|
|
result^.syntax_tree := true
|
|
elsif parameter^^ <> '-' then
|
|
result^.input := parameter^
|
|
else
|
|
write_s("Fatal error: Unknown command line options:");
|
|
|
|
write_c(' ');
|
|
write_z(parameter^);
|
|
write_s(".\n");
|
|
|
|
return nil
|
|
end;
|
|
|
|
i := i + 1
|
|
end;
|
|
if result^.input = nil then
|
|
write_s("Fatal error: no input files.\n");
|
|
return nil
|
|
end;
|
|
|
|
return result
|
|
end
|
|
|
|
proc process(argc: Int, argv: ^^Char) -> Int;
|
|
var
|
|
tokens: ^Token;
|
|
tokens_size: Word;
|
|
source_code: SourceCode;
|
|
command_line: ^CommandLine;
|
|
return_code: Int;
|
|
begin
|
|
return_code := 0;
|
|
|
|
command_line := parse_command_line(argc, argv);
|
|
if command_line = nil then
|
|
return_code := 2
|
|
end;
|
|
|
|
if return_code = 0 then
|
|
source_code.position := make_position();
|
|
|
|
source_code.input := cast(read_source(command_line^.input): ^Byte);
|
|
source_code.empty := source_file_empty;
|
|
source_code.head := source_file_head;
|
|
source_code.advance := source_file_advance;
|
|
|
|
if source_code.input = nil then
|
|
perror(command_line^.input);
|
|
return_code := 3
|
|
end
|
|
end;
|
|
if return_code = 0 then
|
|
tokens := tokenize(source_code, @tokens_size);
|
|
|
|
fclose(cast(source_code.input: ^SourceFile)^.handle);
|
|
|
|
if command_line^.tokenize then
|
|
print_tokens(tokens, tokens_size)
|
|
end
|
|
end;
|
|
return return_code
|
|
end
|
|
|
|
begin
|
|
exit(process(count, parameters))
|
|
end.
|