symbol.cpp

编译原理作业

#include "global.h"

void error(char *m);
char	lexemes[STRMAX];
int		lastchar = -1;
struct entry symtable[SYMMAX];
int		lastentry = 0;

int lookup(char s[])
{
	int p;
	for (p = lastentry; p > 0; p--)
		if ( strcmp(symtable[p].lexptr, s) == 0 )
			return p;
	return 0;
}

int insert(char s[],int tok)
{
	int len;
	len = strlen(s);
	if (lastentry + 1 >= SYMMAX)
		error("symbol table full");
	if (lastchar + len + 1 >= STRMAX)
		error("lexemes array full");
	lastentry++;
	symtable[lastentry].token = tok;
	symtable[lastentry].lexptr = &lexemes[lastchar + 1];
	lastchar += (len + 1);
	strcpy(symtable[lastentry].lexptr, s);
	return lastentry;
}