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#include "cps/Lexer.h"
#include <cctype>
#include <cstdio>
#include <string>
#include <algorithm>
using namespace cps;
int Lexer::gettok() {
static int LastChar = ' ';
while (isspace(LastChar)) {
if (LastChar == '\n') CurrentLine++;
LastChar = getchar();
}
if (isalpha(LastChar)) {
IdentifierStr = LastChar;
while (isalnum((LastChar = getchar())) || LastChar == '_')
IdentifierStr += LastChar;
if (IdentifierStr == "DECLARE") return tok_declare;
if (IdentifierStr == "INTEGER") return tok_integer_kw;
if (IdentifierStr == "BOOLEAN") return tok_integer_kw; // TODO: implement real BOOLEAN
if (IdentifierStr == "REAL") return tok_integer_kw; // TODO: implement real REAL
if (IdentifierStr == "INPUT") return tok_input;
if (IdentifierStr == "OUTPUT") return tok_output;
if (IdentifierStr == "IF") return tok_if;
if (IdentifierStr == "THEN") return tok_then;
if (IdentifierStr == "ELSE") return tok_else;
if (IdentifierStr == "ENDIF") return tok_endif;
if (IdentifierStr == "WHILE") return tok_while;
if (IdentifierStr == "DO") return tok_do;
if (IdentifierStr == "ENDWHILE") return tok_endwhile;
if (IdentifierStr == "REPEAT") return tok_repeat;
if (IdentifierStr == "UNTIL") return tok_until;
if (IdentifierStr == "FOR") return tok_for;
if (IdentifierStr == "TO") return tok_to;
if (IdentifierStr == "STEP") return tok_step;
if (IdentifierStr == "NEXT") return tok_next;
if (IdentifierStr == "ARRAY") return tok_array;
if (IdentifierStr == "OF") return tok_of;
if (IdentifierStr == "FUNCTION") return tok_function;
if (IdentifierStr == "ENDFUNCTION") return tok_endfunction;
if (IdentifierStr == "PROCEDURE") return tok_procedure;
if (IdentifierStr == "ENDPROCEDURE") return tok_endprocedure;
if (IdentifierStr == "RETURN") return tok_return;
if (IdentifierStr == "RETURNS") return tok_returns;
if (IdentifierStr == "CALL") return tok_call;
if (IdentifierStr == "BYREF") return tok_byref;
if (IdentifierStr == "BYVAL") return tok_byval;
return tok_identifier;
}
if (isdigit(LastChar)) {
std::string NumStr;
do {
NumStr += LastChar;
LastChar = getchar();
} while (isdigit(LastChar));
NumVal = strtoll(NumStr.c_str(), nullptr, 10);
return tok_number;
}
if (LastChar == '<') {
LastChar = getchar();
if (LastChar == '-') { // <-
LastChar = getchar();
return tok_assign;
}
if (LastChar == '=') { // <=
LastChar = getchar();
return tok_le;
}
if (LastChar == '>') { // <>
LastChar = getchar();
return tok_ne;
}
return '<';
}
if (LastChar == '>') {
LastChar = getchar();
if (LastChar == '=') { // >=
LastChar = getchar();
return tok_ge;
}
return '>';
}
if (LastChar == '=') {
LastChar = getchar();
return tok_eq;
}
if (LastChar == ':') {
LastChar = getchar();
return tok_colon;
}
if (LastChar == '(') { LastChar = getchar(); return '('; }
if (LastChar == ')') { LastChar = getchar(); return ')'; }
if (LastChar == '[') { LastChar = getchar(); return '['; }
if (LastChar == ']') { LastChar = getchar(); return ']'; }
if (LastChar == ',') { LastChar = getchar(); return ','; }
if (LastChar == '+') { LastChar = getchar(); return '+'; }
if (LastChar == '-') { LastChar = getchar(); return '-'; }
if (LastChar == '*') { LastChar = getchar(); return '*'; }
if (LastChar == '/') {
int NextChar = getchar();
if (NextChar == '/') {
do {
LastChar = getchar();
} while (LastChar != EOF && LastChar != '\n' && LastChar != '\r');
if (LastChar != EOF)
return gettok();
} else {
LastChar = NextChar;
return '/';
}
}
if (LastChar == EOF)
return tok_eof;
int ThisChar = LastChar;
LastChar = getchar();
return ThisChar;
}
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