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lex.c
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/**
* @file lex.c
* @author Jindřich Vodák ([email protected])
* @brief Lexical analyzator
* Implementation IFJ22 compiler
*/
#include "lex.h"
#include "common.h"
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// logging switch
#define lexLog false
// for tests
token_t *testTokens;
bool teston;
// row and row position counters
int row = 1;
int rowPos = 0;
// header conditions
bool php = false;
bool declare = false;
// ending mark check
bool endingMark = false;
// buffer for the last token
token_t lastToken;
// should the last token be returned or new one parsed from input
bool useLastToken = false;
// prints the content of a token
void printTokenData(token_t input) {
switch (input.type) {
// literals
case stringLiteral:
fprintf(stderr, "lextype: stringLiteral\n");
fprintf(stderr, "value: %s\n", dstrGet(input.data.valueString));
break;
case integerLiteral:
fprintf(stderr, "lextype: integerLiteral\n");
fprintf(stderr, "value: %d\n", input.data.valueInteger);
break;
case floatLiteral:
fprintf(stderr, "lextype: floatLiteral\n");
fprintf(stderr, "value: %lf\n", input.data.valueFloat);
break;
// keywords
case elseKey:
fprintf(stderr, "lextype: elseKey\n");
break;
case functionKey:
fprintf(stderr, "lextype: functionkey\n");
break;
case ifKey:
fprintf(stderr, "lextype: ifKey\n");
break;
case nullKey:
fprintf(stderr, "lextype: nullKey\n");
break;
case returnKey:
fprintf(stderr, "lextype: returnKey\n");
break;
case voidKey:
fprintf(stderr, "lextype: voidKey\n");
break;
case whileKey:
fprintf(stderr, "lextype: whileKey\n");
break;
// curly braces
case curlyBraceRight:
fprintf(stderr, "lextype: curlyBraceRight\n");
break;
case curlyBraceLeft:
fprintf(stderr, "lextype: curlyBraceLeft\n");
break;
// data types
case stringKey:
fprintf(stderr, "lextype: stringKey\n");
break;
case floatKey:
fprintf(stderr, "lextype: floatKey\n");
break;
case intKey:
fprintf(stderr, "lextype: intKey\n");
break;
case stringNullKey:
fprintf(stderr, "lextype: stringNullKey\n");
break;
case floatNullKey:
fprintf(stderr, "lextype: floatNullKey\n");
break;
case intNullKey:
fprintf(stderr, "lextype: intNullKey\n");
break;
// assignment
case equals:
fprintf(stderr, "lextype: equals\n");
break;
case colon:
fprintf(stderr, "lextype: colon\n");
break;
case semicolon:
fprintf(stderr, "lextype: semicolon\n");
break;
case comma:
fprintf(stderr, "lextype: comma\n");
break;
// operators
case multiplicationOp:
fprintf(stderr, "lextype: multiplicationOp\n");
break;
case divisionOp:
fprintf(stderr, "lextype: divisionOp\n");
break;
case plusOp:
fprintf(stderr, "lextype: plusOp\n");
break;
case minusOp:
fprintf(stderr, "lextype: minusOp\n");
break;
case concatenationOp:
fprintf(stderr, "lextype: concatenationOp\n");
break;
case lesserThanOp:
fprintf(stderr, "lextype: lesserThanOp\n");
break;
case lesserEqOp:
fprintf(stderr, "lextype: lesserEqOp\n");
break;
case greaterThanOp:
fprintf(stderr, "lextype: greaterThanOp\n");
break;
case greaterEqOp:
fprintf(stderr, "lextype: greaterEqOp\n");
break;
case eqOp:
fprintf(stderr, "lextype: eqOp\n");
break;
case notEqOp:
fprintf(stderr, "lextype: notEqOp\n");
break;
// parentheses
case leftPar:
fprintf(stderr, "lextype: leftPar\n");
break;
case rightPar:
fprintf(stderr, "lextype: rightPar\n");
break;
// identifiers
case identifierFunc:
fprintf(stderr, "lextype: identifierFunc\n");
fprintf(stderr, "value: %s\n", dstrGet(input.data.valueString));
break;
case identifierVar:
fprintf(stderr, "lextype: identifierVar\n");
fprintf(stderr, "value: %s\n", dstrGet(input.data.valueString));
break;
// ending
case ending:
fprintf(stderr, "lextype: ending\n");
break;
// unknown & default
case unknown:
default:
fprintf(stderr, "lextype: unknown\n");
break;
}
fprintf(stderr, "row: %d\nrow position: %d\n", input.rowNumber, input.rowPosNumber);
return;
}
// frees the token from memory
void freeToken(token_t *input) {
switch (input->type) {
case stringLiteral:
case identifierFunc:
case identifierVar:
dstrFree(input->data.valueString);
break;
case floatLiteral:
input->data.valueFloat = 0;
break;
case integerLiteral:
input->data.valueInteger = 0;
break;
default:
break;
}
return;
}
// increments the counters
void incrementCounters(int c) {
switch (c) {
// the alphabet
case 'a' ... 'z':
case 'A' ... 'Z':
rowPos++;
break;
// whitespace characters
case ' ':
rowPos++;
break;
case '\n':
row++;
rowPos = 0;
break;
case '\t':
rowPos += 4;
break;
case '\r':
case '\v':
case '\f':
break;
// default
default:
rowPos++;
break;
}
return;
}
// decrements the counters
void decrementCounters(int c) {
switch (c) {
// the alphabet
case 'a' ... 'z':
case 'A' ... 'Z':
rowPos--;
break;
// whitespace characters
case ' ':
rowPos--;
break;
case '\n':
row--;
break;
case '\t':
rowPos -= 4;
case '\r':
case '\v':
case '\f':
break;
// default
default:
rowPos--;
break;
}
return;
}
// gets next char and automatically increments counters
int getNextChar(FILE *stream) {
int outputChar = getc(stream);
incrementCounters(outputChar);
if (lexLog)
loging("Next char: %c %d", outputChar, outputChar);
return outputChar;
}
// ungets next char and automatically decrements counters
void ungetNextChar(FILE *stream, int currentChar) {
ungetc(currentChar, stream);
decrementCounters(currentChar);
return;
}
// tell getToken to just return the last token and not parse the next one
void ungetToken(FILE *stream) {
loging("Ungetting token");
if (useLastToken) {
InternalError("ungetToken called twice in a row");
}
useLastToken = true;
}
// writes in dynamic string serving as a buffer
void writeToBuffer(dynStr_t *string, int currentChar) {
char tmp[2] = {(char) currentChar, 0};
dstrAppend(string, tmp);
return;
}
// checks if the "<?php" part of the header is present and correct
void headerCheck(FILE *stream) {
// php check
if (php == false) {
char buffer[100];
fgets(buffer, 100, stream);
if ((strcmp(buffer, "<?php") == 0) || (strcmp(buffer, "<?php\n") == 0) || (strcmp(buffer, "<?php\r\n") == 0)) {
php = true;
row++;
} else {
fprintf(stderr, "Syntax error: incorrect header!\n");
exit(2);
}
}
// declare check
if (declare == false) {
token_t checkToken = getToken(stream);
if (checkToken.type == declareHeader) {
char str[18];
fgets(str, 18, stream);
if (strcmp(str, "(strict_types=1);") == 0) {
declare = true;
return;
} else {
fprintf(stderr, "Syntax error: incorrect header!\n");
exit(2);
}
} else {
fprintf(stderr, "Syntax error: incorrect header!\n");
exit(2);
}
}
}
void flushEscSeqBuffer(dynStr_t *buffer, dynStr_t *escSeqBuffer) {
dstrAppend(buffer, dstrGet(escSeqBuffer));
clearBuffer(escSeqBuffer);
return;
}
void clearBuffer(dynStr_t *buffer) {
dstrFree(buffer);
buffer = dstrInit();
}
// gets the next token and advances the pointer
token_t getToken(FILE *stream) {
if (useLastToken) {
useLastToken = false;
return lastToken;
}
// initial declarations
state currentState = init_s;
token_t outputToken;
outputToken.rowNumber = 0;
outputToken.rowPosNumber = 0;
fflush(stream);
int currentChar = getc(stream);
if (lexLog)
loging("Next char: %c", currentChar);
bool stop = false;
int commentCounter = 0;
// sets up a dynamic string (buffer) for saving chars inside a literal or identifier names
dynStr_t *buffer = dstrInit();
// sets up a dynamic string (buffer) for saving chars while in a potential escape sequence
dynStr_t *escSeqBuffer = dstrInit();
// EOF token
if (currentChar == EOF) {
outputToken.type = ending;
lastToken = outputToken;
return outputToken;
} else {
ungetc(currentChar, stream);
}
// parsing loop and FSM
while (stop != true) {
// gets next char and increments counters
currentChar = getNextChar(stream);
// buffer switches
bool bufferOn = false;
bool escBufferOn = false;
// checking for EOF
if (currentChar == EOF) {
if (lexLog)
loging("Found EOF");
break;
}
// checking if the current state is the initial state
// (row position of token is set when transitioning from init_s to a different state)
bool isInit = false;
if (currentState == init_s) {
isInit = true;
}
// FSM
switch (currentChar) {
// the alphabet
case 'a' ... 'z':
case 'A' ... 'Z':
switch (currentState) {
case init_s:
case identifier_func_f_s:
bufferOn = true;
currentState = identifier_func_f_s;
break;
case identifier_var_f_s:
case identifier_var_dollar_s:
bufferOn = true;
currentState = identifier_var_f_s;
break;
case string_lit_s:
bufferOn = true;
currentState = string_lit_s;
break;
case integer_lit_f_s:
case float_lit_f_s:
if ((currentChar == 'e') || (currentChar == 'E')) {
bufferOn = true;
currentState = float_lit_e_s;
} else {
currentState = unknown_f_s;
}
break;
case null_f_s:
bufferOn = true;
currentState = null_f_s;
break;
case com_line_f_s:
currentState = com_line_f_s;
break;
case com_block_s:
case com_block_ast_s:
currentState = com_block_s;
break;
case string_lit_backslash_s:
if (currentChar == 'n') {
writeToBuffer(buffer, '\n');
currentState = string_lit_s;
} else if (currentChar == 't') {
writeToBuffer(buffer, '\t');
currentState = string_lit_s;
} else if (currentChar == 'x') {
escBufferOn = true;
currentState = string_lit_backslash_x_s;
} else {
flushEscSeqBuffer(buffer, escSeqBuffer);
bufferOn = true;
currentState = string_lit_s;
}
break;
case string_lit_backslash_x_s:
if (currentChar == 'a' ||
currentChar == 'A' ||
currentChar == 'b' ||
currentChar == 'B' ||
currentChar == 'c' ||
currentChar == 'C' ||
currentChar == 'd' ||
currentChar == 'D' ||
currentChar == 'e' ||
currentChar == 'E' ||
currentChar == 'f' ||
currentChar == 'F') {
escBufferOn = true;
currentState = string_lit_backslash_x_1_s;
} else {
flushEscSeqBuffer(buffer, escSeqBuffer);
bufferOn = true;
currentState = string_lit_s;
}
break;
case string_lit_backslash_x_1_s:
if (currentChar == 'a' ||
currentChar == 'A' ||
currentChar == 'b' ||
currentChar == 'B' ||
currentChar == 'c' ||
currentChar == 'C' ||
currentChar == 'd' ||
currentChar == 'D' ||
currentChar == 'e' ||
currentChar == 'E' ||
currentChar == 'f' ||
currentChar == 'F') {
// converting to the correct format
writeToBuffer(escSeqBuffer, currentChar);
dynStr_t *number = dstrSubstring(escSeqBuffer, 1, 4);
dstrPrepend(number, "0");
// converting from hex string to int
int res = (int) strtol(dstrGet(number), NULL, 0);
// converting back to string
char string[2];
sprintf(string, "%c", res);
// writing the number to the buffer
dstrAppend(buffer, string);
dstrFree(number);
currentState = string_lit_s;
} else {
flushEscSeqBuffer(buffer, escSeqBuffer);
bufferOn = true;
currentState = string_lit_s;
}
break;
case string_lit_backslash_1_s:
case string_lit_backslash_2_s:
flushEscSeqBuffer(buffer, escSeqBuffer);
bufferOn = true;
break;
case colon_f_s:
ungetNextChar(stream, currentChar);
stop = true;
default:
ungetNextChar(stream, currentChar);
stop = true;
break;
}
break;
// numbers
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
switch (currentState) {
case init_s:
case integer_lit_f_s:
bufferOn = true;
currentState = integer_lit_f_s;
break;
case float_lit_dot_s:
case float_lit_f_s:
bufferOn = true;
currentState = float_lit_f_s;
break;
case float_lit_e_s:
case float_lit_exp_f_s:
case float_lit_sign_s:
bufferOn = true;
currentState = float_lit_exp_f_s;
break;
case string_lit_s:
bufferOn = true;
currentState = string_lit_s;
break;
case identifier_func_f_s:
bufferOn = true;
currentState = identifier_func_f_s;
break;
case identifier_var_f_s:
bufferOn = true;
currentState = identifier_var_f_s;
break;
case com_line_f_s:
currentState = com_line_f_s;
break;
case com_block_s:
case com_block_ast_s:
currentState = com_block_s;
break;
case string_lit_backslash_x_s:
escBufferOn = true;
currentState = string_lit_backslash_x_1_s;
break;
case string_lit_backslash_x_1_s:
// converting to the correct format
writeToBuffer(escSeqBuffer, currentChar);
dynStr_t *number = dstrSubstring(escSeqBuffer, 1, 4);
dstrPrepend(number, "0");
// converting from hex string to int
int res = (int) strtol(dstrGet(number), NULL, 0);
// converting back to string
char string[2];
sprintf(string, "%c", res);
// writing the number to the buffer
dstrAppend(buffer, string);
dstrFree(number);
currentState = string_lit_s;
break;
case string_lit_backslash_s:
if (currentChar >= 48 && currentChar <= 55) {
escBufferOn = true;
currentState = string_lit_backslash_1_s;
} else {
flushEscSeqBuffer(buffer, escSeqBuffer);
bufferOn = true;
currentState = string_lit_s;
}
break;
case string_lit_backslash_1_s:
if (currentChar >= 48 && currentChar <= 55) {
escBufferOn = true;
currentState = string_lit_backslash_2_s;
} else {
flushEscSeqBuffer(buffer, escSeqBuffer);
bufferOn = true;
currentState = string_lit_s;
}
break;
case string_lit_backslash_2_s:
if (currentChar >= 48 && currentChar <= 55) {
// converting to the correct format
writeToBuffer(escSeqBuffer, currentChar);
dynStr_t *number = dstrSubstring(escSeqBuffer, 1, 4);
// converting from octal string to int
char *octal = dstrGet(number);
char octalArray[3];
for (int i = 0; i < 3; i++) {
octalArray[i] = octal[i] - 48;
}
int res = (octalArray[0]) * 8 * 8 + (octalArray[1]) * 8 + (octalArray[2]);
// checking if the number is in range
if (res < 1 || res > 255) {
flushEscSeqBuffer(buffer, escSeqBuffer);
currentState = string_lit_s;
} else {
// converting back to string
char string[2];
sprintf(string, "%c", res);
// writing the number to the buffer
dstrAppend(buffer, string);
currentState = string_lit_s;
}
// freeing the support buffer
dstrFree(number);
} else {
flushEscSeqBuffer(buffer, escSeqBuffer);
bufferOn = true;
currentState = string_lit_s;
}
break;
default:
ungetNextChar(stream, currentChar);
stop = true;
break;
}
break;
// special characters
case '=':
switch (currentState) {
case init_s:
currentState = equals_f_s;
break;
case equals_f_s:
currentState = eq_2_s;
break;
case eq_2_s:
currentState = eq_f_s;
stop = true;
break;
case not_eq_1_s:
currentState = not_eq_2_s;
break;
case not_eq_2_s:
currentState = not_eq_f_s;
stop = true;
break;
case lesser_than_f_s:
currentState = lesser_eq_f_s;
stop = true;
break;
case greater_than_f_s:
currentState = greater_eq_f_s;
stop = true;
break;
case string_lit_s:
bufferOn = true;
currentState = string_lit_s;
break;
case com_line_f_s:
currentState = com_line_f_s;
break;
case com_block_s:
case com_block_ast_s:
currentState = com_block_s;
break;
case string_lit_backslash_s:
case string_lit_backslash_1_s:
case string_lit_backslash_2_s:
case string_lit_backslash_x_s:
case string_lit_backslash_x_1_s:
flushEscSeqBuffer(buffer, escSeqBuffer);
bufferOn = true;
currentState = string_lit_s;
break;
default:
ungetNextChar(stream, currentChar);
stop = true;
break;
}
break;
case '!':
switch (currentState)
{
case init_s:
currentState = not_eq_1_s;
break;
case string_lit_s:
bufferOn = true;
currentState = string_lit_s;
break;
case com_line_f_s:
currentState = com_line_f_s;
break;
case com_block_s:
case com_block_ast_s:
currentState = com_block_s;
break;
case string_lit_backslash_s:
case string_lit_backslash_1_s:
case string_lit_backslash_2_s:
case string_lit_backslash_x_s:
case string_lit_backslash_x_1_s:
flushEscSeqBuffer(buffer, escSeqBuffer);
bufferOn = true;
currentState = string_lit_s;
break;
default:
ungetNextChar(stream, currentChar);
stop = true;
break;
}
break;
case ':':
switch (currentState) {
case init_s:
currentState = colon_f_s;
stop = true;
break;
case string_lit_s:
bufferOn = true;
currentState = string_lit_s;
break;
case com_line_f_s:
currentState = com_line_f_s;
break;
case com_block_s:
case com_block_ast_s:
currentState = com_block_s;
break;
case string_lit_backslash_s:
case string_lit_backslash_1_s:
case string_lit_backslash_2_s:
case string_lit_backslash_x_s:
case string_lit_backslash_x_1_s:
flushEscSeqBuffer(buffer, escSeqBuffer);
bufferOn = true;
currentState = string_lit_s;
break;
default:
ungetNextChar(stream, currentChar);
stop = true;
break;
}
break;
case ';':
switch (currentState) {
case init_s:
currentState = semicolon_f_s;
stop = true;
break;
case string_lit_s:
bufferOn = true;
currentState = string_lit_s;
break;
case com_line_f_s:
currentState = com_line_f_s;
break;
case com_block_s:
case com_block_ast_s:
currentState = com_block_s;
break;
case string_lit_backslash_s:
case string_lit_backslash_1_s:
case string_lit_backslash_2_s:
case string_lit_backslash_x_s:
case string_lit_backslash_x_1_s:
flushEscSeqBuffer(buffer, escSeqBuffer);
bufferOn = true;
currentState = string_lit_s;
break;
default:
ungetNextChar(stream, currentChar);
stop = true;
break;
}
break;
case '(':
switch (currentState) {
case init_s:
currentState = left_par_f_s;
stop = true;
break;
case string_lit_s:
bufferOn = true;
currentState = string_lit_s;
break;
case identifier_func_f_s:
ungetNextChar(stream, currentChar),
currentState = identifier_func_f_s;
stop = true;
break;
case com_line_f_s:
currentState = com_line_f_s;
break;
case com_block_s:
case com_block_ast_s:
currentState = com_block_s;
break;
case string_lit_backslash_s:
case string_lit_backslash_1_s:
case string_lit_backslash_2_s:
case string_lit_backslash_x_s:
case string_lit_backslash_x_1_s:
flushEscSeqBuffer(buffer, escSeqBuffer);
bufferOn = true;
currentState = string_lit_s;
break;
default:
ungetNextChar(stream, currentChar);
stop = true;
break;
}
break;
case ')':
switch (currentState) {
case init_s:
currentState = right_par_f_s;
stop = true;
break;
case string_lit_s:
bufferOn = true;
currentState = string_lit_s;
break;
case com_line_f_s:
currentState = com_line_f_s;
break;
case com_block_s:
case com_block_ast_s:
currentState = com_block_s;
break;
case string_lit_backslash_s:
case string_lit_backslash_1_s:
case string_lit_backslash_2_s:
case string_lit_backslash_x_s:
case string_lit_backslash_x_1_s:
flushEscSeqBuffer(buffer, escSeqBuffer);
bufferOn = true;
currentState = string_lit_s;
break;
default:
ungetNextChar(stream, currentChar);
stop = true;
break;
}
break;
case '{':
switch (currentState) {
case init_s:
currentState = left_curly_f_s;
stop = true;
break;
case string_lit_s:
bufferOn = true;
currentState = string_lit_s;
break;
case com_line_f_s:
currentState = com_line_f_s;
break;
case com_block_s:
case com_block_ast_s:
currentState = com_block_s;
break;
case string_lit_backslash_s:
case string_lit_backslash_1_s:
case string_lit_backslash_2_s:
case string_lit_backslash_x_s:
case string_lit_backslash_x_1_s:
flushEscSeqBuffer(buffer, escSeqBuffer);
bufferOn = true;
currentState = string_lit_s;
break;
default:
ungetNextChar(stream, currentChar);
stop = true;
break;
}
break;
case '}':
switch (currentState) {
case init_s:
currentState = right_curly_f_s;
stop = true;
break;
case string_lit_s:
bufferOn = true;
currentState = string_lit_s;
break;
case com_line_f_s:
currentState = com_line_f_s;
break;
case com_block_s:
case com_block_ast_s:
currentState = com_block_s;
break;
case string_lit_backslash_s:
case string_lit_backslash_1_s:
case string_lit_backslash_2_s:
case string_lit_backslash_x_s:
case string_lit_backslash_x_1_s:
flushEscSeqBuffer(buffer, escSeqBuffer);
bufferOn = true;
currentState = string_lit_s;
break;
default:
ungetNextChar(stream, currentChar);
stop = true;
break;
}
break;
case '$':
switch (currentState) {
case init_s:
currentState = identifier_var_dollar_s;
break;
case com_line_f_s:
currentState = com_line_f_s;
break;
case com_block_s:
case com_block_ast_s:
currentState = com_block_s;
break;
case string_lit_backslash_s:
bufferOn = true;
currentState = string_lit_s;
break;
case string_lit_backslash_1_s:
case string_lit_backslash_2_s:
case string_lit_backslash_x_s:
case string_lit_backslash_x_1_s:
flushEscSeqBuffer(buffer, escSeqBuffer);
bufferOn = true;
currentState = string_lit_s;
break;
default:
ungetNextChar(stream, currentChar);
stop = true;
break;
}
break;
case '_':
switch (currentState) {
case init_s:
bufferOn = true;
currentState = identifier_func_f_s;
break;
case identifier_var_dollar_s:
case identifier_var_f_s:
bufferOn = true;
currentState = identifier_var_f_s;
break;
case identifier_func_f_s:
bufferOn = true;
currentState = identifier_func_f_s;
break;
case string_lit_s:
bufferOn = true;
currentState = string_lit_s;
break;
case com_line_f_s:
currentState = com_line_f_s;
break;
case com_block_s:
case com_block_ast_s:
currentState = com_block_s;
break;
case string_lit_backslash_s:
case string_lit_backslash_1_s:
case string_lit_backslash_2_s:
case string_lit_backslash_x_s:
case string_lit_backslash_x_1_s:
flushEscSeqBuffer(buffer, escSeqBuffer);
bufferOn = true;
currentState = string_lit_s;
break;
default:
ungetNextChar(stream, currentChar);
stop = true;
break;