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grain.c
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grain.c
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#include <stdio.h>
#include <stdlib.h>
#define READ_SIZE 500
enum position {START, STOP};
enum boolean {FALSE, TRUE};
enum iterators {FILE_ITER = 0, FIELD_ITER = 1, VAR = 2};
enum comparator {LE = 0, LT = 1, GE = 2, GT = 3, EQ = 4, NE = 5};
enum null {NOT_FOUND = -1, NO_INDEX = -1, NO_LOOP = -1, STRING = -1};
enum errors {OOR, NO_DOLLAR, NO_BUFFER, NO_FILE_ITER, INDEX_VAR, NOT_EXIST, NOT_NUM, ASSIGN, EXISTS, ESC_SEQ, NO_EQUALS, NO_FI, NO_OUT};
enum tokenType {TERMINATOR = 6, QUOTE = 7, VARIABLE = 8, COMMA = 9, ASSIGNMENT = 10, DOLLAR = 11, MATHS = 12, NUMBER = 13};
struct fileDict {
char *key; // filename
char *delimiter; // delimiter
int len; // length of delimiter
FILE *fp;
};
struct fileStruct {
int count;
struct fileDict *dict;
} files;
struct varDict {
char *key;
char *val;
};
struct varStruct {
int count;
struct varDict *dict;
} vars;
struct fieldDict {
char *key;
char *val;
int len;
};
struct fieldStruct {
int count;
struct fieldDict *dict;
} fields;
struct loopStruct {
int type; // 0 = file ; 1 = field
int isLoop; // 0 = false ; 1 = true
int addr; // address offet to find relevant file/field struct
int index; // occurence of file/field iterator to locate
int chain; // 0 = false; 1 = true
long cmd; // fseek to start of loop in script
char *buff;
int start;
int stop;
};
struct loopStack {
int ptr; // stack pointer
int cap; // stack capacity
struct loopStruct *stack;
} loops;
void throwError(int errNum, char *errStr, int errA, int errB){
// errA and errB are used to pass integers, they could be represent types or substring coordinates. Set to -1 if unused.
switch(errNum){
case OOR:
fprintf(stderr, "ERROR: %s iterator '%s[%i]' is out of range.\n", errB == FIELD_ITER ? "field" : "file", errStr, errA);
break;
case NO_DOLLAR:
fprintf(stderr, "ERROR: expected dollar '$'. Found '%c'.\n", *errStr);
break;
case NO_BUFFER:
fprintf(stderr, "ERROR: no buffer set. Asterisk '*' only relevant within an 'in' block.\n");
break;
case NO_FILE_ITER:
if (errB != -1) errStr[errB]=0;
fprintf(stderr, "ERROR: field iterator '%s' cannot be used without first reading into a file iterator.\n", errB != -1 ? &errStr[errA] : errStr);
break;
case INDEX_VAR:
fprintf(stderr, "ERROR: variable '%s' cannot be indexed.\n", errStr);
break;
case NOT_EXIST:
errStr[errB]=0;
fprintf(stderr, "ERROR: '%s' does not exist.\n", &errStr[errA]);
break;
case NO_INDEX:
fprintf(stderr, "ERROR: %s iterator '%s' requires an index in this context.\n", errB == FIELD_ITER ? "field" : "file", errStr);
break;
case NOT_NUM:
if (errB != -1) errStr[errB] = 0;
fprintf(stderr, "ERROR: '%s' is not a valid number.\n", errB != -1 ? &errStr[errA] : errStr);
break;
case ASSIGN:
fprintf(stderr, "ERROR: %s iterator '%s' cannot be assigned to.\n", errA == FIELD_ITER ? "field" : "file", errStr);
break;
case EXISTS:
fprintf(stderr, "ERROR: '%s' already exists as %s.\n", errStr, errA == FIELD_ITER ? "field iterator" : (errA == FILE_ITER ? "file iterator" : "variable"));
break;
case ESC_SEQ:
fprintf(stderr, "ERROR: '\\%c' escape sequence not recognised. Valid escape sequences include \\n, \\t, \\\\, \\', \\` and \\\".\n", *errStr);
break;
case NO_EQUALS:
fprintf(stderr, "ERROR: expected equals '=' assignment operator. Found '%c'.\n", *errStr);
break;
case NO_FI:
fprintf(stderr, "ERROR: 'if' block without closing 'fi' statement.\n");
break;
case NO_OUT:
fprintf(stderr, "ERROR: 'in' block without closing 'out' statement.\n");
break;
}
exit(errNum);
}
int getNextToken(char *txt, int *cursors){
// Moves cursors[START] and cursors[STOP] around next token
// Returns int representing type of token found
// START scans from *after* END
cursors[START] = cursors[STOP] + 1;
// Skip leading whitespace
while (txt[cursors[START]] == ' ' || txt[cursors[START]] == '\t') ++cursors[START];
// Check if terminator, quote or other
switch (txt[cursors[START]]){
case '\n':
case ';':
case '\0':
return TERMINATOR;
case ',':
cursors[STOP] = cursors[START];
return COMMA;
case '$':
cursors[STOP] = cursors[START];
return DOLLAR;
case '=':
if (txt[cursors[START]+1] == '='){
cursors[STOP] = cursors[START]+1;
return EQ;
}
else {
cursors[STOP] = cursors[START];
return ASSIGNMENT;
}
case '<':
if (txt[cursors[START]+1] == '='){
cursors[STOP] = cursors[START]+1;
return LE;
}
else {
cursors[STOP] = cursors[START];
return LT;
}
case '>':
if (txt[cursors[START]+1] == '='){
cursors[STOP] = cursors[START]+1;
return GE;
}
else {
cursors[STOP] = cursors[START];
return GT;
}
case '!':
if (txt[cursors[START]+1] == '='){
cursors[STOP] = cursors[START]+1;
return NE;
}
else {
fprintf(stderr, "! token unrecognised\n");
exit(1);
}
case '+':
case '-':
case '*':
case '/':
case '%':
cursors[STOP] = cursors[START]+1;
return MATHS;
case '\'':
case '"':
case '`':
// Found quote. Scan to matching quotation mark.
for (cursors[STOP] = cursors[START] + 1; txt[cursors[STOP]] != txt[cursors[START]] ; ++cursors[STOP]){
// Check for escape character. If found, shuffle string left and convert.
if (txt[cursors[STOP]] == '\\'){
for (int i=cursors[STOP], j=cursors[STOP]+1; txt[i]!=0; ++i, ++j) txt[i] = txt[j];
switch (txt[cursors[STOP]]){
case 'n':
txt[cursors[STOP]] = '\n';
break;
case 't':
txt[cursors[STOP]] = '\t';
break;
case '\\':
txt[cursors[STOP]] = '\\';
break;
case '\'':
txt[cursors[STOP]] = '\'';
break;
case '"':
txt[cursors[STOP]] = '"';
break;
case '`':
txt[cursors[STOP]] = '`';
break;
default:
throwError(ESC_SEQ, &txt[cursors[STOP]], -1, -1);
}
}
}
++cursors[START];
return QUOTE;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
for (cursors[STOP] = cursors[START]+1; txt[cursors[STOP]] != ' '
&& txt[cursors[STOP]] != '\t'
&& txt[cursors[STOP]] != '\n'
&& txt[cursors[STOP]] != 0
&& txt[cursors[STOP]] != '='
&& txt[cursors[STOP]] != ';'
&& txt[cursors[STOP]] != ',' ; ++cursors[STOP]);
return NUMBER;
default:
for (cursors[STOP] = cursors[START]+1; txt[cursors[STOP]] != ' '
&& txt[cursors[STOP]] != '\t'
&& txt[cursors[STOP]] != '\n'
&& txt[cursors[STOP]] != 0
&& txt[cursors[STOP]] != '='
&& txt[cursors[STOP]] != ';'
&& txt[cursors[STOP]] != ','
&& txt[cursors[STOP]] != '.'
&& txt[cursors[STOP]] != '('
&& txt[cursors[STOP]] != ')'
&& txt[cursors[STOP]] != '['
&& txt[cursors[STOP]] != ']' ; ++cursors[STOP]);
return VARIABLE;
}
}
int substringEquals(char *comp, char *txt, int *cursors){
// Checks if comp matches txt[START-STOP]
int compPos=0;
for (int txtPos=cursors[START]; txtPos < cursors[STOP]; ++compPos, ++txtPos) if (comp[compPos] != txt[txtPos]) return FALSE;
return comp[compPos] == 0;
}
int stringEquals(char *comp, char *txt){
// Checks if comp matches txt
for (int i=0; comp[i] != 0 && txt[i] != 0; ++i) if (comp[i] != txt[i]) return FALSE;
return TRUE;
}
char *substringSave(char *dest, char *source, int *cursors){
// Reallocate dest and copy source[START-STOP] into dest
dest = realloc(dest, (1 + cursors[STOP] - cursors[START]) * sizeof(char));
dest[cursors[STOP]-cursors[START]] = 0;
for (int destPos=0; cursors[START] < cursors[STOP]; ++cursors[START], ++destPos) dest[destPos] = source[cursors[START]];
return dest;
}
char *stringSave(char *dest, char *source){
// Reallocate dest and copy source into dest
int length = 0;
while (source[length] != 0) ++length;
dest = realloc(dest, (length+1) * sizeof(char));
for (int pos=0; pos < length; ++pos) dest[pos] = source[pos];
dest[length] = 0;
return dest;
}
int findVar(char *txt, int *cursors){
// Returns index of var in varDict where key matches txt substring. Or -1
for (int v=0; v < vars.count; ++v) if (substringEquals(vars.dict[v].key, txt, cursors)) return v;
return NOT_FOUND;
}
int findFileIter(char *txt, int *cursors){
// Returns index of file in fileDict where key matches txt substring. Or -1
for (int f=0; f < files.count; ++f) if (substringEquals(files.dict[f].key, txt, cursors)) return f;
return NOT_FOUND;
}
int findFieldIter(char *txt, int *cursors){
// Returns index of field in fieldDict where key matches txt substring. Or -1
for (int s=0; s < fields.count; ++s) if (substringEquals(fields.dict[s].key, txt, cursors)) return s;
return NOT_FOUND;
}
int substringIsNum(char *txt, int from, int to){
for (int decimalCount=0 ; from < to; ++from) {
if ( (decimalCount += (txt[from]==46)) > 1
|| txt[from] != 46 && txt[from] < 48
|| txt[from] > 57) return FALSE;
}
return TRUE;
}
int stringIsNum(char *txt){
for (int pos=0, decimalCount=0; txt[pos] != 0; ++pos) {
if ( (decimalCount += (txt[pos]==46)) > 1
|| txt[pos] != 46 && txt[pos] < 48
|| txt[pos] > 57) return FALSE;
}
return TRUE;
}
float substring2Num(char *txt, int *cursors){
// Converts txt[START-STOP] to float
float result = 0;
int pos, isNeg=(txt[cursors[START]]=='-');
for (pos=cursors[START] + isNeg; pos < cursors[STOP] && txt[pos] != '.'; ++pos){
result *= 10;
if (txt[pos] < 48 || txt[pos] > 57) throwError(NOT_NUM, txt, cursors[START], cursors[STOP]);
else result += (float)(txt[pos] - 48);
}
if (txt[pos] == '.'){
++pos;
for (int shift = 10; pos < cursors[STOP]; shift *= 10, ++pos){
if (txt[pos] < 48 || txt[pos] > 57) throwError(NOT_NUM, txt, cursors[START], cursors[STOP]);
else result += (float)(txt[pos]-48) / (float)shift;
}
}
return isNeg ? 0 - result : result;
}
float string2Num(char *txt){
// Converts txt to float
float result=0;
int pos, isNeg=(txt[0]=='-');
for (pos=isNeg; txt[pos] != 0 && txt[pos] != '.'; ++pos){
result *= 10;
if (txt[pos] < 48 || txt[pos] > 57) throwError(NOT_NUM, txt, -1, -1);
else result += (float)(txt[pos] - 48);
}
if (txt[pos] == '.'){
++pos;
for (int shift = 10; txt[pos] != 0; shift *= 10, ++pos){
if (txt[pos] < 48 || txt[pos] > 57) throwError(NOT_NUM, txt, -1, -1);
else result += (float)(txt[pos]-48) / (float)shift;
//result += (float)(txt[pos]-48) / (float)shift;
}
}
return isNeg ? 0 - result : result;
}
int skipWhitespace(char *txt, int from){
while (txt[++from] == ' ' || txt[from] == '\t' || txt[from] == '\n');
return from;
}
int getNextField(char *txt, char *delimiter, int start, int stop){
// Returns delimiter starting position in txt[start-stop]
if (delimiter == NULL){ // delimiter == whitespace
while (txt[start] != ' ' && txt[start] != '\t' && txt[start] != '\n' && start < stop) ++start ;
return start >= stop ? NOT_FOUND : start;
}
else for (int i=start, j; i < stop; ++i){
for (j=0; delimiter[j] != 0 && txt[i+j] == delimiter[j]; ++j);
if (delimiter[j] == 0) return i + (delimiter[0] == 0);
}
return NOT_FOUND;
}
int skipFields(char *txt, struct fieldDict *field, int index, int from, int to){
// Load field position after skipping "index" number of fields
while (index-- && (from = getNextField(txt, field->val, from, to)) != -1) from = (field->val == NULL ? skipWhitespace(txt, from) : from + field->len) ;
return from;
}
char *loadFile(char *buff, struct fileDict file, int *length, int index){
// Skip "index" number of "file" records and load next into "buff"
// Saves buff length into *length
int buffCap=0, cursor, found, in;
for (int ind = index+1; ind; buffCap=0, --ind){
do {
cursor = buffCap;
buffCap += READ_SIZE;
buff = realloc(buff, (buffCap+1) * sizeof(char));
in = fread(&buff[cursor], sizeof(char), READ_SIZE, file.fp);
found = getNextField(buff, file.delimiter, cursor, cursor + in);
} while (found == NOT_FOUND && in == READ_SIZE);
if (found != NOT_FOUND) fseek(file.fp, (long)(0 - (feof(file.fp) ? in : buffCap) + found + file.len), SEEK_CUR);
if (feof(file.fp) && ind > 1) throwError(OOR, file.key, index, -1);
}
*length = (found == NOT_FOUND ? cursor + in : found);
if (feof(file.fp) && *length==0){
free(buff);
return NULL;
}
else {
buff[*length] = 0;
return realloc(buff, (1 + *length) * sizeof(char));
}
}
void printSubstring(char *txt, int start, int stop){
// Temporarily null terminate substring for printing
char swap = txt[stop];
txt[stop] = 0;
printf("%s", &txt[start]);
txt[stop] = swap;
}
float token2Num(char *txt, int *cursors){
// Convert token to integer. Either variable or string number.
return txt[cursors[START]] >= 48 && txt[cursors[START]] <= 57 ? substring2Num(txt, cursors) : string2Num(vars.dict[findVar(txt, cursors)].val);
}
char *num2String(char *txt, float num){
int isNeg = (num < 0);
if (isNeg) num *= -1;
int upper = (int)num, upperDigits = 0, lowerDigits = 0;
float lower = num - upper;
for (int cpy=upper; cpy ; cpy/=10, ++upperDigits);
while ( (lower - (int)lower) > 0.0000000000000001f) lower*=10, ++lowerDigits;
// total digits: add one for decimal place, one for negative symbol and one if number == 0
int totalDigits = upperDigits + lowerDigits + (lowerDigits > 0) + isNeg + (upper == 0);
txt = realloc(txt, (totalDigits + 1) * sizeof(char));
txt[totalDigits] = 0;
for (int cpy = (int)lower, pos = lowerDigits; pos; cpy/=10, --pos) txt[--totalDigits] = (cpy % 10) + 48;
if (lowerDigits) txt[--totalDigits] = '.';
if (upper == 0) txt[--totalDigits] = '0';
else for (int cpy = upper; cpy ; cpy/=10) txt[--totalDigits] = (cpy % 10) + 48;
if (isNeg) txt[--totalDigits] = '-';
return txt;
}
char *substringJoin(char *dest, char *src, int from, int to){
// Join source[from-to] to end of dest
int len = 0;
if (dest != NULL) while (dest[len] != 0) ++len;
dest = realloc(dest, (len + to - from + 1) * sizeof(char));
for (int dPos=len, sPos=from; sPos < to; ++dPos, ++sPos) dest[dPos] = src[sPos];
dest[len + to - from] = 0;
return dest;
}
char *stringJoin(char *dest, char *src){
// Append src to dest
if (src == NULL) return dest;
int dLen=0, sLen=0;
if (dest != NULL) while (dest[dLen] != 0) ++dLen;
while (src[sLen] != 0) ++sLen;
dest = realloc(dest, (dLen + sLen + 1) * sizeof(char));
for (int dPos=dLen, sPos=0; src[sPos]!=0; ++dPos, ++sPos) dest[dPos] = src[sPos];
dest[dLen + sLen] = 0;
return dest;
}
struct loopStack loadLoop(char *scriptLine, FILE *scriptFile);
struct loopStack resetLoop(char *scriptLine, FILE *scriptFile){
// Setup loopStruct cursors
// Use resetLoop on the way up the chain, use loadLoop on the way down the chain
struct loopStruct *loop = &loops.stack[loops.ptr];
if (loop->type == FIELD_ITER){
// Load FIELD_ITER
struct loopStruct *parent = &loops.stack[loops.ptr-1];
loop->buff = parent->buff;
if (loop->index == NO_INDEX) loop->start = parent->start;
else if ( (loop->start = skipFields(loop->buff, &fields.dict[loop->addr], loop->index, parent->start, parent->stop)) == NOT_FOUND)
throwError(OOR, fields.dict[loop->addr].key, loop->index, -1);
if ( (loop->stop = getNextField(loop->buff, fields.dict[loop->addr].val, loop->start, parent->stop)) == NOT_FOUND)
loop->stop = parent->stop;
}
else {
// Load FILE_ITER
loop->buff = loadFile(NULL, files.dict[loop->addr], &loop->stop, loop->index);
if (loop->buff == NULL) return --loops.ptr == -1 ? loops : loadLoop(scriptLine, scriptFile);
else loop->start = 0;
}
if (loop->chain == TRUE){
++loops.ptr;
return resetLoop(scriptLine, scriptFile);
}
else if (loop->cmd == -1) loop->cmd = ftell(scriptFile);
else fseek(scriptFile, loop->cmd, SEEK_SET);
return loops;
}
struct loopStack loadLoop(char *scriptLine, FILE *scriptFile){
// Advance loopStruct cursors
// Use loadLoop on the way down the chain, use resetLoop on the way up the chain
struct loopStruct *loop = &loops.stack[loops.ptr];
struct loopStruct *parent = &loops.stack[loops.ptr-1];
if (loop->isLoop == FALSE)
return --loops.ptr == -1 || loops.stack[loops.ptr].chain == FALSE ? loops : loadLoop(scriptLine, scriptFile);
else if (loop->type == FIELD_ITER){
loop->start = (fields.dict[loop->addr].val == NULL ? skipWhitespace(loop->buff, loop->stop) : loop->stop + fields.dict[loop->addr].len);
// delim != whitespace && delim == char-by-char && reached final char
if (loop->start > parent->stop || fields.dict[loop->addr].val != NULL && fields.dict[loop->addr].val[0] == 0 && loop->start == parent->stop)
return --loops.ptr == -1 || loops.stack[loops.ptr].chain == FALSE ? loops : loadLoop(scriptLine, scriptFile);
else if ( (loop->stop = getNextField(loop->buff, fields.dict[loop->addr].val, loop->start, parent->stop)) == NOT_FOUND)
loop->stop = parent->stop;
}
else if ( (loop->buff = loadFile(loop->buff, files.dict[loop->addr], &loop->stop, 0)) == NULL)
return --loops.ptr == -1 || loops.stack[loops.ptr].chain == FALSE ? loops : loadLoop(scriptLine, scriptFile);
if (loop->chain == TRUE){
++loops.ptr;
return resetLoop(scriptLine, scriptFile);
}
else {
fseek(scriptFile, loop->cmd, SEEK_SET);
return loops;
}
}
int retrieveToken(int *outCurs, char **outTxt, char *inTxt, int *inCurs){
// Converts next token to value. Gets token from inTxt[start-stop]. Returns string in outTxt[start-stop]
// Token could refer to a variable, file iterator or field iterator. Could be a number or string quote.
// If substring, puts start/stop in outCurs. Else string, puts STRING (-1) in outCurs[START]
// If memory allocated for string, returns TRUE. Else returns FALSE.
// If no token, returns TERMINATOR (-1)
int addr;
switch (getNextToken(inTxt, inCurs)){
case DOLLAR:
// User provided dollar ($), which means "entire buffer"
if (inTxt[inCurs[START]] != '$') throwError(NO_DOLLAR, &inTxt[inCurs[START]], -1, -1);
else if (loops.ptr == NO_LOOP) throwError(NO_BUFFER, NULL, -1, -1);
*outTxt = loops.stack[loops.ptr].buff;
if (loops.stack[loops.ptr].type == FIELD_ITER){
outCurs[START] = loops.stack[loops.ptr].start;
outCurs[STOP] = loops.stack[loops.ptr].stop;
}
else outCurs[START] = STRING;
return FALSE;
case NUMBER:
case QUOTE:
outCurs[START] = inCurs[START];
outCurs[STOP] = inCurs[STOP];
*outTxt = inTxt;
return FALSE;
case VARIABLE:
if (inTxt[inCurs[STOP]] == '['){ // Iterator
if ((addr = findFieldIter(inTxt, inCurs)) != NOT_FOUND) { // Field iterator
if (loops.ptr == NO_LOOP) throwError(NO_FILE_ITER, fields.dict[addr].key, -1, -1);
getNextToken(inTxt, inCurs);
struct loopStruct *loop = &loops.stack[loops.ptr];
outCurs[START] = skipFields(loop->buff, &fields.dict[addr], (int)token2Num(inTxt, inCurs), loop->start, loop->stop);
if (outCurs[START] == NOT_FOUND) throwError(OOR, fields.dict[addr].key, (int)token2Num(inTxt, inCurs), FIELD_ITER);
outCurs[STOP] = getNextField(loop->buff, fields.dict[addr].val, outCurs[START], loop->stop);
if (outCurs[STOP] == NOT_FOUND) outCurs[STOP] = loop->stop;
*outTxt = loops.stack[loops.ptr].buff;
return FALSE;
}
else if ((addr = findFileIter(inTxt, inCurs)) != NOT_FOUND){ // File iterator
getNextToken(inTxt, inCurs);
outCurs[START] = STRING;
*outTxt = loadFile(NULL, files.dict[addr], &addr, (int)token2Num(inTxt, inCurs));
return TRUE;
}
else if ((addr = findVar(inTxt, inCurs)) != NOT_FOUND) throwError(INDEX_VAR, vars.dict[addr].key, -1, -1); // Var error
else throwError(NOT_EXIST, inTxt, inCurs[START], inCurs[STOP]); // Unknown error
}
else if ((addr = findVar(inTxt, inCurs)) != NOT_FOUND){ // Variable
outCurs[START] = STRING;
*outTxt = vars.dict[addr].val;
return FALSE;
}
else if ((addr=findFieldIter(inTxt, inCurs)) != NOT_FOUND ) throwError(NO_INDEX, fields.dict[addr].key, FIELD_ITER, -1);
else if ((addr=findFileIter(inTxt, inCurs)) != NOT_FOUND) throwError(NO_INDEX, files.dict[addr].key, FILE_ITER, -1);
else throwError(NOT_EXIST, inTxt, inCurs[START], inCurs[STOP]); // Unknown error
case COMMA:
case TERMINATOR:
return TERMINATOR;
default:
fprintf(stderr, "Unknown token\n");
exit(1);
}
}
char *varStrAss(char *scriptLine, int *cursors){
// Assign multiple concatenated strings to a variable
char *out = NULL, *buff;
int freeBuff, buffCurs[2];
while (scriptLine[cursors[STOP]] != ',' && (freeBuff=retrieveToken(buffCurs, &buff, scriptLine, cursors)) != TERMINATOR){
out = buffCurs[START] == STRING ? stringJoin(out, buff) : substringJoin(out, buff, buffCurs[START], buffCurs[STOP]);
if (freeBuff) free(buff);
}
return out;
}
char *varMthAss(int varAddr, char *scriptLine, int *cursors){
float augend = string2Num(vars.dict[varAddr].val), addend;
do {
char op = scriptLine[cursors[START]];
char *subTxt;
int augCurs[2];
int toFree = retrieveToken(augCurs, &subTxt, scriptLine, cursors);
addend = augCurs[START] == STRING ? string2Num(subTxt) : substring2Num(subTxt, augCurs);
if (toFree == TRUE) free(subTxt);
switch(op){
case '+':
augend += addend;
break;
case '-':
augend -= addend;
break;
case '*':
augend *= addend;
break;
case '/':
augend /= addend;
break;
case '%':
augend = (int)augend % (int)addend;
break;
}
} while (getNextToken(scriptLine, cursors) != TERMINATOR);
return num2String(vars.dict[varAddr].val, augend);
}
int compareTokens(char *txtA, int *cursA, char *txtB, int *cursB){
// Return 0 if A == B ; > 0 if A > B ; < 0 if A < B
// Inefficient. IsNum() functions are used, then used again in the 2Num() functions.
int aIsNum = cursA[START] == STRING ? stringIsNum(txtA) : substringIsNum(txtA, cursA[START], cursA[STOP]);
int bIsNum = cursB[START] == STRING ? stringIsNum(txtB) : substringIsNum(txtB, cursB[START], cursB[STOP]);
if (aIsNum && bIsNum){
float a = cursA[START] == STRING ? string2Num(txtA) : substring2Num(txtA, cursA);
float b = cursB[START] == STRING ? string2Num(txtB) : substring2Num(txtB, cursB);
return a == b ? 0 : a > b ? 1 : -1;
}
else {
int result;
for(int aPos=cursA[START] == STRING ? 0 : cursA[START], bPos=cursB[START] == STRING ? 0 : cursB[START] ;
(cursA[START] == STRING && txtA[aPos] != 0 || cursA[START] != STRING && aPos < cursA[STOP])
&& (cursB[START] == STRING && txtB[bPos] != 0 || cursB[START] != STRING && bPos < cursB[STOP])
&& (result = txtA[aPos]-txtB[bPos]) == 0 ; ++aPos, ++bPos);
return result;
}
}
int comparator(char *scriptLine, int *cursors){
// Return TRUE/FALSE result of statement
// Gets tokens from IF and interprets comparator operand
int cursA[2], cursB[2];
char *txtA, *txtB;
int freeA = retrieveToken(cursA, &txtA, scriptLine, cursors), freeB, result;
int operator = getNextToken(scriptLine, cursors);
if (operator == VARIABLE){
int inc = substringEquals("inc", scriptLine, cursors);
freeB = retrieveToken(cursB, &txtB, scriptLine, cursors);
// getNextField() requires txtA start/stop coords
if (cursA[START] == STRING) for (cursA[STOP]=0; txtA[cursA[STOP]] != 0; ++cursA[STOP]);
// getNextField() requires txtB as null-terminated string
char swap;
if (cursB[START] != STRING) {
swap = txtB[cursB[STOP]];
txtB[cursB[STOP]] = 0;
}
result = (getNextField(txtA, &txtB[cursB[START]], cursA[START] == -1 ? 0 : cursA[START], cursA[STOP]) != NOT_FOUND);
if (!inc) result = !result;
if (cursB[START] != STRING) txtB[cursB[STOP]] = swap;
}
else {
freeB = retrieveToken(cursB, &txtB, scriptLine, cursors);
result = compareTokens(txtA, cursA, txtB, cursB);
switch (operator){
case LT:
result = result < 0;
break;
case LE:
result = result <= 0;
break;
case GT:
result = result > 0;
break;
case GE:
result = result >= 0;
break;
case EQ:
result = result == 0;
break;
case NE:
result = result != 0;
break;
default:
fprintf(stderr, "Comparator %i not recognised\n", operator);
exit(1);
}
}
int andFlag=FALSE, orFlag=FALSE;
if ( getNextToken(scriptLine, cursors) != TERMINATOR && (andFlag=substringEquals("and", scriptLine, cursors)) == FALSE )
orFlag = substringEquals("or", scriptLine, cursors);
if (freeA) free(txtA);
if (freeB) free(txtB);
if (result == TRUE) return andFlag ? comparator(scriptLine, cursors) : TRUE;
else return orFlag ? comparator(scriptLine, cursors) : FALSE;
}
int nextIf(char *scriptLine, FILE *scriptFile, int *cursors){
// Finds next IF block
// Returns TRUE if execution should resume
// Returns FALSE if a further "elif" test is required
while (fgets(scriptLine, READ_SIZE + 1, scriptFile) && !feof(scriptFile)){
cursors[STOP] = -1;
getNextToken(scriptLine, cursors);
if (substringEquals("elif", scriptLine, cursors)) return FALSE;
else if (substringEquals("fi", scriptLine, cursors)) return TRUE;
else if (substringEquals("else", scriptLine, cursors)) return TRUE;
}
throwError(NO_FI, NULL, -1, -1);
}
void endLoop(char *scriptLine, FILE *scriptFile){
for (int loopCount=1; loopCount; ){
fgets(scriptLine, READ_SIZE + 1, scriptFile);
if (feof(scriptFile)) throwError(NO_OUT, NULL, -1, -1);
int cursors[2] = {-1, -1};
getNextToken(scriptLine, cursors);
if (substringEquals("in", scriptLine, cursors)) ++loopCount;
else if (substringEquals("out", scriptLine, cursors)) --loopCount;
}
}
int main(int argc, char **argv){
vars.count = 0, vars.dict = NULL;
fields.count = 0, fields.dict = NULL;
files.count = 0, files.dict = NULL;
loops.ptr = -1, loops.cap = 0, loops.stack = NULL;
char scriptLine[READ_SIZE + 1];
FILE *scriptFile = fopen(argv[1], "r");
for ( fgets(scriptLine, READ_SIZE + 1, scriptFile) ; !feof(scriptFile); fgets(scriptLine, READ_SIZE + 1, scriptFile) ) {
int cursors[2] = {0, -1};
if (getNextToken(scriptLine, cursors) == TERMINATOR) continue;
else if (substringEquals("var", scriptLine, cursors)){
do {
getNextToken(scriptLine, cursors);
int addr;
if ((addr = findFieldIter(scriptLine, cursors)) != NOT_FOUND) throwError(EXISTS, fields.dict[addr].key, FIELD_ITER, -1);
else if ((addr = findFileIter(scriptLine, cursors)) != NOT_FOUND) throwError(EXISTS, files.dict[addr].key, FILE_ITER, -1);
else if ((addr = findVar(scriptLine, cursors)) == NOT_FOUND){
// Allocate new variable
addr = vars.count++;
vars.dict = realloc(vars.dict, vars.count * sizeof(struct varDict));
vars.dict[addr].val = NULL;
vars.dict[addr].key = substringSave(NULL, scriptLine, cursors);
}
switch(scriptLine[cursors[STOP]]){
case '=':
// String assignment without whitespace
vars.dict[addr].val = varStrAss(scriptLine, cursors);
break;
case '+':
case '-':
case '/':
case '*':
case '%':
// Maths assignment without whitespace
if (scriptLine[cursors[STOP]+1] != '=') throwError(NO_EQUALS, &scriptLine[cursors[STOP]+1], -1, -1);
vars.dict[addr].val = realloc(vars.dict[addr].val, 2 * sizeof(char));
vars.dict[addr].val[0] = '0';
vars.dict[addr].val[1] = '\0';
vars.dict[addr].val = varMthAss(addr, scriptLine, cursors);
break;
default:
switch(getNextToken(scriptLine,cursors)){
case ASSIGNMENT:
// String assignment with whitespace
vars.dict[addr].val = varStrAss(scriptLine, cursors);
break;
case MATHS:
// Maths assignment with whitespace
if (scriptLine[cursors[STOP]] != '=') throwError(NO_EQUALS, &scriptLine[cursors[STOP]], -1, -1);
vars.dict[addr].val = realloc(vars.dict[addr].val, 2 * sizeof(char));
vars.dict[addr].val[0] = '0';
vars.dict[addr].val[1] = '\0';
vars.dict[addr].val = varMthAss(addr, scriptLine, cursors);
break;
default:
if (vars.dict[addr].val == NULL || vars.dict[addr].val[0] != 0){
// No assignment: initialise empty variable
vars.dict[addr].val = realloc(vars.dict[addr].val, sizeof(char));
vars.dict[addr].val[0] = 0;
}
break;
}
}
} while (scriptLine[cursors[START]] == ',' || scriptLine[cursors[STOP]] == ','); // Multiple comma-separated var declarations
}
else if (substringEquals("print", scriptLine, cursors)){
char *buff;
int freeBuff, printCurs[2];
while ( (freeBuff=retrieveToken(printCurs, &buff, scriptLine, cursors)) != TERMINATOR){
if (printCurs[START] == NOT_FOUND) printf("%s", buff);
else printSubstring(buff, printCurs[START], printCurs[STOP]);
if (freeBuff == TRUE) free(buff);
}
}
else if (substringEquals("file", scriptLine, cursors)){
// Get name
getNextToken(scriptLine, cursors);
int addr;
if ((addr = findVar(scriptLine, cursors)) != NOT_FOUND) throwError(EXISTS, vars.dict[addr].key, VAR, -1);
else if ((addr = findFieldIter(scriptLine, cursors)) != NOT_FOUND) throwError(EXISTS, fields.dict[addr].key, FIELD_ITER, -1);
else if ((addr = findFileIter(scriptLine, cursors)) == NOT_FOUND){
// Allocate new file iterator
addr = files.count++;
files.dict = realloc(files.dict, files.count * sizeof(struct fileDict));
files.dict[addr].key = substringSave(NULL, scriptLine, cursors);
}
else {
// Clear/Close this file iterator
free(files.dict[addr].delimiter);
fclose(files.dict[addr].fp);
}
struct fileDict *file = &files.dict[addr];
// Get filename
if (getNextToken(scriptLine, cursors) == QUOTE) {
char swap = scriptLine[cursors[STOP]];
scriptLine[cursors[STOP]] = 0;
file->fp = fopen(&scriptLine[cursors[START]], "r");
scriptLine[cursors[STOP]] = swap;
}
else file->fp = fopen(vars.dict[findVar(scriptLine, cursors)].val, "r");
// Get delimiter
if (scriptLine[cursors[STOP]] == ',' || getNextToken(scriptLine, cursors) == COMMA){
switch(getNextToken(scriptLine, cursors)){
case QUOTE:
file->len = cursors[STOP] - cursors[START];
file->delimiter = substringSave(NULL, scriptLine, cursors);
break;
case MATHS:
if (scriptLine[cursors[START]] != '*') ; // throw some kind of error
else ; // load entire file
case DOLLAR:
// What if they put a file segment into a file segment?
// retrieveToken() might be a better choice for this switch statement
case VARIABLE:
file->delimiter = stringSave(NULL, vars.dict[findVar(scriptLine, cursors)].val);
for (file->len = 0; file->delimiter[file->len] != 0; ++file->len);
default:
// Raise invalid token error
}
}
else { // No delimiter provided. Default = newline (\n)
file->len = 1;
file->delimiter = malloc(2 * sizeof(char));
file->delimiter[0] = '\n';
file->delimiter[1] = 0;
}
}
else if (substringEquals("field", scriptLine, cursors)){
// Get name
getNextToken(scriptLine, cursors);
int addr;
if ((addr = findVar(scriptLine, cursors)) != NOT_FOUND) throwError(EXISTS, vars.dict[addr].key, VAR, -1);
else if ((addr = findFileIter(scriptLine, cursors)) != NOT_FOUND) throwError(EXISTS, files.dict[addr].key, FILE_ITER, -1);
else if ((addr=findFieldIter(scriptLine, cursors)) == NOT_FOUND){
addr = fields.count++;
fields.dict = realloc(fields.dict, fields.count * sizeof(struct fieldDict));
fields.dict[addr].key = substringSave(NULL, scriptLine, cursors);
}
else free(fields.dict[addr].val);
struct fieldDict *field = &fields.dict[addr];
// Get delimiter
if (getNextToken(scriptLine, cursors) == QUOTE) {
field->len = cursors[STOP] - cursors[START];
field->val = substringSave(NULL, scriptLine, cursors);
}
else if (scriptLine[cursors[START]] != ')'){
field->val = stringSave(NULL, vars.dict[findVar(scriptLine, cursors)].val);
for (field->len = 0; field->val[field->len] != 0; ++field->len);
}
else { // No delimiter provided. Default = whitespace
field->len = 0;
field->val = NULL;
}
}
else if (substringEquals("in", scriptLine, cursors)){
do {
if (++loops.ptr == loops.cap){
++loops.cap;
loops.stack = realloc(loops.stack, loops.cap * sizeof(struct loopStruct));
}
struct loopStruct *loop = &loops.stack[loops.ptr];
// Save cmd
loop->cmd = -1;
// Get type and addr
getNextToken(scriptLine, cursors);
loop->addr = findFileIter(scriptLine, cursors);
if ( loop->type = (loop->addr == NOT_FOUND) ) {
if (!loops.ptr) throwError(NO_FILE_ITER, scriptLine, cursors[START], cursors[STOP]);
loop->addr = findFieldIter(scriptLine, cursors);
}
// Get index
if (scriptLine[cursors[STOP]] == '['){
loop->isLoop = FALSE;
getNextToken(scriptLine, cursors);
loop->index = (int)token2Num(scriptLine, cursors);
}
else {
loop->isLoop = TRUE;
loop->index = loop->type == FIELD_ITER? -1 : 0;
}
loop->chain = FALSE;
loops = resetLoop(scriptLine, scriptFile);
} while ( loops.ptr != -1 && (loops.stack[loops.ptr].chain = (scriptLine[cursors[STOP]] == '.')) );
if (loops.ptr == NO_LOOP) endLoop(scriptLine, scriptFile);
}
else if (substringEquals("out", scriptLine, cursors) || substringEquals("cont", scriptLine, cursors)){
loops = loadLoop(scriptLine, scriptFile);
}
else if (substringEquals("cont", scriptLine, cursors)){
loops = loadLoop(scriptLine, scriptFile);
if (loops.ptr == NO_LOOP) endLoop(scriptLine, scriptFile);
}
else if (substringEquals("if", scriptLine, cursors)){
while (comparator(scriptLine, cursors) == FALSE && nextIf(scriptLine, scriptFile, cursors) == FALSE);
}
else if (substringEquals("elif", scriptLine, cursors) || substringEquals("else", scriptLine, cursors)){
for (fgets(scriptLine, READ_SIZE + 1, scriptFile) ; substringEquals("fi", scriptLine, cursors) == FALSE; fgets(scriptLine, READ_SIZE + 1, scriptFile), cursors[STOP]=-1, getNextToken(scriptLine, cursors));
}
else if (substringEquals("break", scriptLine, cursors)){
do {
if (loops.stack[loops.ptr].type == FILE_ITER) free(loops.stack[loops.ptr].buff);
} while ( --loops.ptr >= 0 && loops.stack[loops.ptr].chain == TRUE);
endLoop(scriptLine, scriptFile);
}
else if (substringEquals("exit", scriptLine, cursors)){
break;
}
else if (substringEquals("fi", scriptLine, cursors) == FALSE){
int destAddr = findVar(scriptLine, cursors);
if (destAddr == NOT_FOUND){
int err;
if ((err=findFieldIter(scriptLine, cursors)) != NOT_FOUND) throwError(ASSIGN, fields.dict[err].key, FIELD_ITER, -1);
else if ((err=findFileIter(scriptLine, cursors)) != NOT_FOUND) throwError(ASSIGN, files.dict[err].key, FILE_ITER, -1);
else throwError(NOT_EXIST, scriptLine, cursors[START], cursors[STOP]);
}
if (scriptLine[cursors[STOP]] == '=' || getNextToken(scriptLine, cursors) == ASSIGNMENT){
char *newVar = varStrAss(scriptLine, cursors);
free(vars.dict[destAddr].val);
vars.dict[destAddr].val = newVar;
}
else {
vars.dict[destAddr].val = varMthAss(destAddr, scriptLine, cursors);
}
}
}
// CLEAN UP
fclose(scriptFile);