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lexer.c
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lexer.c
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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdarg.h>
#include <math.h>
#include <stdint.h>
#include <regex.h>
#include <assert.h>
#include "citron.h"
// TODO: implement state saves / restores for lexer_plug.c
int ctr_clex_bflmt = 255;
ctr_size ctr_clex_tokvlen = 0; /* length of the string value of a token */
char *ctr_clex_buffer;
char *ctr_code;
char *ctr_code_st;
char *ctr_code_eoi;
char *ctr_eofcode;
char *ctr_clex_oldptr;
char *ctr_clex_olderptr;
int ctr_clex_verbatim_mode = 0; /* flag: indicates whether lexer operates in verbatim mode or not (1 = ON, 0 = OFF) */
uintptr_t ctr_clex_verbatim_mode_insert_quote = 0; /* pointer to 'overlay' the 'fake quote' for verbatim mode */
int ctr_clex_old_line_number = 0;
int ctr_transform_lambda_shorthand = 0; /* flag: indicated whether lexer has seen a shorthand lambda (\(:arg)+ expr) */
char *ctr_clex_desc_tok_ref = "reference";
char *ctr_clex_desc_tok_quote = "'";
char *ctr_clex_desc_tok_number = "number";
char *ctr_clex_desc_tok_paropen = "(";
char *ctr_clex_desc_tok_parclose = ")";
char *ctr_clex_desc_tok_blockopen = "{";
char *ctr_clex_desc_tok_blockopen_map = "{\\";
char *ctr_clex_desc_tok_blockclose = "}";
char *ctr_clex_desc_tok_tupopen = "[";
char *ctr_clex_desc_tok_tupclose = "]";
char *ctr_clex_desc_tok_colon = ":";
char *ctr_clex_desc_tok_dot = ".";
char *ctr_clex_desc_tok_chain = ",";
char *ctr_clex_desc_tok_booleanyes = "True";
char *ctr_clex_desc_tok_booleanno = "False";
char *ctr_clex_desc_tok_nil = "Nil";
char *ctr_clex_desc_tok_assignment = ":="; //derp
char *ctr_clex_desc_tok_passignment = "=>"; //REEEE
char *ctr_clex_desc_tok_symbol = "\\"; //TODO FIXME Find a better character for this
char *ctr_clex_desc_tok_ret = "^";
char *ctr_clex_desc_tok_ret_unicode = "↑";
char *ctr_clex_desc_tok_fin = "end of program";
char *ctr_clex_desc_tok_unknown = "(unknown token)";
int ctr_string_interpolation = 0;
char *ivarname;
int ivarlen;
#define MAX_LEXER_SAVE_STATES 1024
static struct lexer_state saved_lexer_states[MAX_LEXER_SAVE_STATES];
static int saved_lexer_state_next_index = 0;
#define MAX_LEXER_INJECT_VECTOR_COUNT 1024
static int inject_index = -1; //-1 -> nothing to inject
typedef struct
{
int token;
int vlen;
char *value;
} token_inj_t;
static token_inj_t injects[MAX_LEXER_INJECT_VECTOR_COUNT]; //tokens to inject
/**
* Lexer - Inject token
*
* Injects a token to be returned before the next actual one
* returns 0 unless there's not enough room in the lexer injection
* vector
*/
int
ctr_clex_inject_token (int token, const char *value, const int vlen)
{
if (inject_index == MAX_LEXER_INJECT_VECTOR_COUNT)
return 1;
//printf("Injecting (id=%d) %d (%.*s)\n", inject_index, token, vlen, value);
token_inj_t inject = {
token,
vlen,
(char *) value,
};
injects[++inject_index] = inject;
return 0;
}
__attribute__ ((always_inline))
static int do_inject_token ()
{
if (inject_index > -1)
{
token_inj_t inj = injects[inject_index--];
if (inj.value)
{
strncpy (ctr_clex_buffer, inj.value, inj.vlen);
ctr_clex_tokvlen = inj.vlen;
}
return inj.token;
}
else
return -1;
}
/**
* Lexer - Save Lexer state
*
* saves the state of the lexer and
* gives a unique ID used for restoring that state.
*/
int
ctr_clex_save_state ()
{
if (saved_lexer_state_next_index == MAX_LEXER_SAVE_STATES)
return -1; //no more space left
struct lexer_state ls = {
ctr_string_interpolation,
ivarlen,
ctr_clex_tokvlen,
ctr_clex_buffer,
ctr_code,
ctr_code_st,
ctr_code_eoi,
ctr_eofcode,
ctr_clex_oldptr,
ctr_clex_olderptr,
ctr_clex_verbatim_mode,
ctr_clex_verbatim_mode_insert_quote,
ctr_clex_old_line_number,
ctr_transform_lambda_shorthand,
ivarname,
inject_index
};
saved_lexer_states[saved_lexer_state_next_index++] = ls;
return saved_lexer_state_next_index - 1;
}
int
ctr_clex_dump_state (struct lexer_state *ls)
{
ls->string_interpolation = ctr_string_interpolation;
ls->ivarlen = ivarlen;
ls->ctr_clex_tokvlen = ctr_clex_tokvlen;
ls->ctr_clex_buffer = ctr_clex_buffer;
ls->ctr_code = ctr_code;
ls->ctr_code_st = ctr_code_st;
ls->ctr_code_eoi = ctr_code_eoi;
ls->ctr_eofcode = ctr_eofcode;
ls->ctr_clex_oldptr = ctr_clex_oldptr;
ls->ctr_clex_olderptr = ctr_clex_olderptr;
ls->ctr_clex_verbatim_mode = ctr_clex_verbatim_mode;
ls->ctr_clex_verbatim_mode_insert_quote = ctr_clex_verbatim_mode_insert_quote;
ls->ctr_clex_old_line_number = ctr_clex_old_line_number;
ls->ctr_transform_lambda_shorthand = ctr_transform_lambda_shorthand;
ls->ivarname = ivarname;
ls->inject_index = inject_index;
return 0;
}
/**
* Lexer - Restore lexer state
*
* @param int id - id of the lexer state to restore
* if id == TOS-1, set it free
* @returns int - whether the last state was freed
*/
int
ctr_clex_restore_state (int id)
{
assert (id < MAX_LEXER_SAVE_STATES);
if (id == saved_lexer_state_next_index - 1)
saved_lexer_state_next_index--;
struct lexer_state ls = saved_lexer_states[id];
ctr_string_interpolation = ls.string_interpolation;
ivarlen = ls.ivarlen;
ctr_clex_tokvlen = ls.ctr_clex_tokvlen;
ctr_clex_buffer = ls.ctr_clex_buffer;
ctr_code = ls.ctr_code;
ctr_code_st = ls.ctr_code_st;
ctr_code_eoi = ls.ctr_code_eoi;
ctr_eofcode = ls.ctr_eofcode;
ctr_clex_oldptr = ls.ctr_clex_oldptr;
ctr_clex_olderptr = ls.ctr_clex_olderptr;
ctr_clex_verbatim_mode = ls.ctr_clex_verbatim_mode;
ctr_clex_verbatim_mode_insert_quote = ls.ctr_clex_verbatim_mode_insert_quote;
ctr_clex_old_line_number = ls.ctr_clex_old_line_number;
ctr_transform_lambda_shorthand = ls.ctr_transform_lambda_shorthand;
ivarname = ls.ivarname;
inject_index = ls.inject_index;
return id == saved_lexer_state_next_index;
}
int
ctr_clex_load_state (struct lexer_state ls)
{
ctr_string_interpolation = ls.string_interpolation;
ivarlen = ls.ivarlen;
ctr_clex_tokvlen = ls.ctr_clex_tokvlen;
ctr_clex_buffer = ls.ctr_clex_buffer;
ctr_code = ls.ctr_code;
ctr_code_st = ls.ctr_code_st;
ctr_code_eoi = ls.ctr_code_eoi;
ctr_eofcode = ls.ctr_eofcode;
ctr_clex_oldptr = ls.ctr_clex_oldptr;
ctr_clex_olderptr = ls.ctr_clex_olderptr;
ctr_clex_verbatim_mode = ls.ctr_clex_verbatim_mode;
ctr_clex_verbatim_mode_insert_quote = ls.ctr_clex_verbatim_mode_insert_quote;
ctr_clex_old_line_number = ls.ctr_clex_old_line_number;
ctr_transform_lambda_shorthand = ls.ctr_transform_lambda_shorthand;
ivarname = ls.ivarname;
inject_index = ls.inject_index;
return 0;
}
void
ctr_clex_pop_saved_state ()
{
saved_lexer_state_next_index--;
}
/**
* Lexer - is Symbol Delimiter ?
* Determines whether the specified symbol is a delimiter.
* Returns 1 if the symbol is a delimiter and 0 otherwise.
*
* @param char symbol symbol to be inspected
*
* @return uint8_t
*/
uint8_t
ctr_clex_is_delimiter (char symbol)
{
return (symbol == '(' || symbol == '[' || symbol == ']'
|| symbol == ')' || symbol == ',' || symbol == '.' || symbol == ':' || symbol == ' ' || symbol == '\t');
}
unsigned long
ctr_clex_position ()
{
return ctr_code - ctr_code_st - ctr_clex_tokvlen;
}
/**
* CTRLexerEmitError
*
* Displays an error message for the lexer.
*/
void
ctr_clex_emit_error (char *message)
{
#ifdef EXIT_ON_ERROR
printf ("%s on line: %d. \n", message, ctr_clex_line_number);
exit (1);
#else
CtrStdFlow = ctr_format_str ("E%s on line: %d.\n", message, ctr_clex_line_number);
#endif
}
/**
* CTRLexerLoad
*
* Loads program into memory.
*/
void
ctr_clex_load (char *prg)
{
ctr_code = prg;
ctr_code_st = ctr_code;
ctr_clex_buffer = ctr_heap_allocate_tracked (ctr_clex_bflmt);
ctr_clex_buffer[0] = '\0';
ctr_eofcode = (ctr_code + ctr_program_length);
ctr_clex_line_number = 0;
ctr_clex_code_init = ctr_code;
ctr_clex_code_end = ctr_eofcode;
}
/**
* CTRLexerTokenValue
*
* Returns the string of characters representing the value
* of the currently selected token.
*/
char *
ctr_clex_tok_value ()
{
return ctr_clex_buffer;
}
char *
ctr_clex_tok_describe (int token)
{
char *description;
switch (token)
{
case CTR_TOKEN_RET:
description = ctr_clex_desc_tok_ret;
break;
case CTR_TOKEN_ASSIGNMENT:
description = ctr_clex_desc_tok_assignment;
break;
case CTR_TOKEN_PASSIGNMENT:
description = ctr_clex_desc_tok_passignment;
break;
case CTR_TOKEN_BLOCKCLOSE:
description = ctr_clex_desc_tok_blockclose;
break;
case CTR_TOKEN_BLOCKOPEN:
description = ctr_clex_desc_tok_blockopen;
break;
case CTR_TOKEN_BLOCKOPEN_MAP:
description = ctr_clex_desc_tok_blockopen_map;
break;
case CTR_TOKEN_BOOLEANNO:
description = ctr_clex_desc_tok_booleanno;
break;
case CTR_TOKEN_BOOLEANYES:
description = ctr_clex_desc_tok_booleanyes;
break;
case CTR_TOKEN_CHAIN:
description = ctr_clex_desc_tok_chain;
break;
case CTR_TOKEN_COLON:
description = ctr_clex_desc_tok_colon;
break;
case CTR_TOKEN_DOT:
description = ctr_clex_desc_tok_dot;
break;
case CTR_TOKEN_FIN:
description = ctr_clex_desc_tok_fin;
break;
case CTR_TOKEN_NIL:
description = ctr_clex_desc_tok_nil;
break;
case CTR_TOKEN_NUMBER:
description = ctr_clex_desc_tok_number;
break;
case CTR_TOKEN_PARCLOSE:
description = ctr_clex_desc_tok_parclose;
break;
case CTR_TOKEN_PAROPEN:
description = ctr_clex_desc_tok_paropen;
break;
case CTR_TOKEN_QUOTE:
description = ctr_clex_desc_tok_quote;
break;
case CTR_TOKEN_REF:
description = ctr_clex_desc_tok_ref;
break;
case CTR_TOKEN_TUPOPEN:
description = ctr_clex_desc_tok_tupopen;
break;
case CTR_TOKEN_TUPCLOSE:
description = ctr_clex_desc_tok_tupclose;
break;
case CTR_TOKEN_SYMBOL:
description = ctr_clex_desc_tok_symbol;
break;
default:
description = ctr_clex_desc_tok_unknown;
}
return description;
}
/**
* CTRLexerTokenValueLength
*
* Returns the length of the value of the currently selected token.
*/
long
ctr_clex_tok_value_length ()
{
return ctr_clex_tokvlen;
}
/**
* CTRLexerPutBackToken
*
* Puts back a token and resets the pointer to the previous one.
*/
void
ctr_clex_putback ()
{
if (ctr_string_interpolation > 0)
{
ctr_string_interpolation--;
return;
}
ctr_code = ctr_clex_oldptr;
ctr_clex_oldptr = ctr_clex_olderptr;
ctr_clex_line_number = ctr_clex_old_line_number;
}
int
check_next_line_empty ()
{
if (!regexLineCheck)
return 0;
switch (regexLineCheck->value)
{
case 0:
{
return *(ctr_code + 1) != '\n';
}
case 1:
{
regex_t pattern;
if (regcomp (&pattern, "^$", 0))
ctr_clex_emit_error ("PCRE could not compile regex, please turn regexLineCheck off.");
int x = regexec (&pattern, ctr_code + 1, 0, NULL,
0) == REG_NOMATCH;
regfree (&pattern);
return x;
}
}
return 0;
}
/**
* CTRActivatePragma
*
* Activates a pragma based off its type
* t -> toggle, o -> one-shot (Cannot be deactivated)
*/
void
ctr_activate_pragma (ctr_code_pragma * pragma)
{
switch (pragma->type)
{
case 'o':
pragma->value = 1;
break;
case 't':
pragma->value = 1 - pragma->value;
break;
}
}
/**
* CTRLexPragmaToken
*
* Reads the token after '#:' and toggles a pragma.
*
*/
void
ctr_match_toggle_pragma ()
{
if (strncmp (ctr_code, ":oneLineExpressions", 19) == 0)
{
ctr_activate_pragma (oneLineExpressions);
ctr_code += 18;
}
if (strncmp (ctr_code, ":regexLineCheck", 15) == 0)
{
ctr_activate_pragma (regexLineCheck);
ctr_code += 14;
}
if (strncmp (ctr_code, ":flexibleConstructs", 19) == 0)
{
ctr_activate_pragma (flexibleConstructs);
ctr_code += 18;
}
}
int
ctr_clex_is_valid_digit_in_base (char c, int b)
{
if (b <= 10)
{
if ((c >= '0') && (c < ('0' + b)))
return 1;
}
else if (b <= 36)
{
if ((c >= '0') && (c <= '9'))
return 1;
else if ((c >= 'A') && (c < 'A' + (b - 10)))
return 1;
}
return 0; //unsupported base or not a digit
}
/**
* CTRLexerReadToken
*
* Reads the next token from the program buffer and selects this
* token.
*/
int
ctr_clex_tok ()
{
int tinj;
if ((tinj = do_inject_token ()) != -1)
{
//printf("Injected %d\n", tinj);
ctr_clex_olderptr = ctr_clex_oldptr;
ctr_clex_oldptr = ctr_code;
return tinj;
}
if (ctr_code == ctr_eofcode)
{
return CTR_TOKEN_FIN;
}
char c;
int i, comment_mode, presetToken, pragma_mode;
ctr_clex_tokvlen = 0;
ctr_clex_olderptr = ctr_clex_oldptr;
ctr_clex_oldptr = ctr_code;
ctr_clex_old_line_number = ctr_clex_line_number;
i = 0;
comment_mode = 0;
pragma_mode = 0;
/* a little state machine to handle string interpolation, */
/* i.e. transforms ' $$x ' into: ' ' + x + ' '. */
switch (ctr_string_interpolation)
{
case 1:
presetToken = CTR_TOKEN_QUOTE;
break;
case 2:
case 4:
memcpy (ctr_clex_buffer, "+", 1);
ctr_clex_tokvlen = 1;
presetToken = CTR_TOKEN_REF;
break;
case 3:
memcpy (ctr_clex_buffer, ivarname, ivarlen);
ctr_clex_tokvlen = ivarlen;
presetToken = CTR_TOKEN_REF;
break;
case 5:
ctr_code = ctr_code_eoi;
presetToken = CTR_TOKEN_QUOTE;
break;
}
/* return the preset token, and transition to next state */
if (ctr_string_interpolation)
{
ctr_string_interpolation++;
return presetToken;
}
/* if verbatim mode is on and we passed the '>' verbatim write message, insert a 'fake quote' (?>') */
if (ctr_clex_verbatim_mode == 1 && ctr_clex_verbatim_mode_insert_quote == (uintptr_t) ctr_code)
{
return CTR_TOKEN_QUOTE;
}
if (ctr_code != ctr_eofcode && *ctr_code == '\n' && check_next_line_empty () && oneLineExpressions->value)
{
ctr_code++;
return CTR_TOKEN_DOT;
}
c = *ctr_code;
while (ctr_code != ctr_eofcode && (isspace (c) || c == '#' || comment_mode))
{
if (c == '\n')
{
comment_mode = 0;
pragma_mode = 0;
ctr_clex_line_number++;
}
if (c == '#')
{
comment_mode = 1;
if (*(ctr_code + 1) == ':')
pragma_mode = 1;
}
if (pragma_mode)
ctr_match_toggle_pragma ();
ctr_code++;
c = *ctr_code;
}
if (ctr_code == ctr_eofcode)
{
return CTR_TOKEN_FIN;
}
if (c == '\\')
{
ctr_code++;
int t = ctr_clex_tok ();
ctr_clex_putback ();
if (t != CTR_TOKEN_REF)
{
if (t == CTR_TOKEN_COLON)
{ // transform \:x expr to {\:x expr}
ctr_transform_lambda_shorthand = 1;
return CTR_TOKEN_BLOCKOPEN_MAP; //HACK This thing here simply transforms the syntax, however we fool the in-language lexer to think that this is actually a ref
}
else
{ // if not a (\:x expr) then it's simply a message
ctr_clex_buffer[0] = '\\';
ctr_clex_tokvlen = 1;
return CTR_TOKEN_REF;
}
// ctr_clex_emit_error("Expected a reference");
}
return CTR_TOKEN_SYMBOL;
}
if (c == '(')
{
ctr_code++;
return CTR_TOKEN_PAROPEN;
}
if (c == ')')
{
ctr_code++;
return CTR_TOKEN_PARCLOSE;
}
if (c == '[')
{
ctr_code++;
return CTR_TOKEN_TUPOPEN;
}
if (c == ']')
{
ctr_code++;
return CTR_TOKEN_TUPCLOSE;
}
if (c == '{')
{
ctr_code++;
if (ctr_code != ctr_eofcode && (c = *ctr_code) == '\\')
{
ctr_code++;
return CTR_TOKEN_BLOCKOPEN_MAP;
}
else
return CTR_TOKEN_BLOCKOPEN;
}
if (c == '}')
{
ctr_code++;
return CTR_TOKEN_BLOCKCLOSE;
}
if (c == '.')
{
ctr_code++;
return CTR_TOKEN_DOT;
}
if (c == ',')
{
ctr_code++;
return CTR_TOKEN_CHAIN;
}
if (((c == 'i') && (ctr_code + 1) < ctr_eofcode
&& (*(ctr_code + 1) == 's') && isspace (*(ctr_code + 2))) || ((c == ':') && (ctr_code + 1) < ctr_eofcode && (*(ctr_code + 1) == '=')))
{
ctr_code += 2;
return CTR_TOKEN_ASSIGNMENT;
}
if ((c == '=') && (ctr_code + 1) < ctr_eofcode && (*(ctr_code + 1) == '>'))
{
ctr_code += 2;
return CTR_TOKEN_PASSIGNMENT;
}
if (c == ':' /*&& ctr_code+1!=ctr_eofcode && *(ctr_code+1) != ':' */ )
{
int is_name = 0;
while (ctr_code + 1 < ctr_eofcode && *(ctr_code + 1) == ':')
{
is_name++;
ctr_code++;
ctr_clex_buffer[i++] = ':';
ctr_clex_tokvlen++;
}
ctr_code++;
if (is_name)
{
if (ctr_clex_tokvlen > 1)
ctr_code--;
return CTR_TOKEN_REF;
}
return CTR_TOKEN_COLON;
}
if (c == '^')
{
ctr_code++;
return CTR_TOKEN_RET;
}
//↑
if ((ctr_code + 2) < ctr_eofcode && (uint8_t) c == 226 && ((uint8_t) * (ctr_code + 1) == 134) && ((uint8_t) * (ctr_code + 2) == 145))
{
ctr_code += 3;
return CTR_TOKEN_RET;
}
if (c == '\'')
{
ctr_code++;
return CTR_TOKEN_QUOTE;
}
if ((c == '-' && (ctr_code + 1) < ctr_eofcode && isdigit (*(ctr_code + 1))) || isdigit (c))
{
int xnum_likely = c == '0';
int base = 10;
ctr_clex_buffer[i] = c;
ctr_clex_tokvlen++;
i++;
ctr_code++;
c = toupper (*ctr_code);
if (xnum_likely)
base = c == 'X' ? 16 : c == 'C' ? 8 : 10; //let the parser handle incorrect values
if (base == 10)
xnum_likely = 0; //not an xnum
if (base != 10)
{
if (c != 'C')
{
ctr_clex_buffer[i] = c;
ctr_clex_tokvlen++;
i++;
} //ignore the C, for strtod
ctr_code++;
c = toupper (*ctr_code);
}
while ((ctr_clex_is_valid_digit_in_base (c, base)))
{
ctr_clex_buffer[i] = c;
ctr_clex_tokvlen++;
i++;
ctr_code++;
c = toupper (*ctr_code);
}
if (c == '.' && (ctr_code + 1 <= ctr_eofcode) && !ctr_clex_is_valid_digit_in_base (toupper (*(ctr_code + 1)), base))
{
return CTR_TOKEN_NUMBER;
}
if (c == '.')
{
ctr_clex_buffer[i] = c;
ctr_clex_tokvlen++;
i++;
ctr_code++;
c = toupper (*ctr_code);
}
while ((ctr_clex_is_valid_digit_in_base (c, base)))
{
ctr_clex_buffer[i] = c;
ctr_clex_tokvlen++;
i++;
ctr_code++;
c = toupper (*ctr_code);
}
c = *ctr_code;
return CTR_TOKEN_NUMBER;
}
if (strncmp (ctr_code, "True", 4) == 0)
{
if (ctr_clex_is_delimiter (*(ctr_code + 4)))
{
ctr_code += 4;
return CTR_TOKEN_BOOLEANYES;
}
}
if (strncmp (ctr_code, "False", 5) == 0)
{
if (ctr_clex_is_delimiter (*(ctr_code + 5)))
{
ctr_code += 5;
return CTR_TOKEN_BOOLEANNO;
}
}
if (strncmp (ctr_code, "Nil", 3) == 0)
{
if (ctr_clex_is_delimiter (*(ctr_code + 3)))
{
ctr_code += 3;
return CTR_TOKEN_NIL;
}
}
/* if we encounter a '?>' sequence, switch to verbatim mode in lexer */
if (strncmp (ctr_code, "?>", 2) == 0)
{
ctr_clex_verbatim_mode = 1;
ctr_code += 2;
// memcpy (ctr_clex_buffer, "?", 1);
// ctr_clex_tokvlen = 1;
return CTR_TOKEN_QUOTE;
}
/* if lexer is in verbatim mode and we pass the '>' symbol insert a fake quote as next token */
if (strncmp (ctr_code, ">", 1) == 0 && ctr_clex_verbatim_mode == 1)
{
// ctr_clex_verbatim_mode_insert_quote = (uintptr_t) (ctr_code + 1); /* this way because multiple invocations should return same result */
// ctr_code++;
return CTR_TOKEN_QUOTE;
// memcpy (ctr_clex_buffer, ">", 1);
// ctr_clex_tokvlen = 1;
// return CTR_TOKEN_REF;
}
// if (*ctr_code == ':') {
// int i = 1;
// ctr_code++;
// while(ctr_code+1!=ctr_eofcode && *(ctr_code++)==':') i++;
// if(i>ctr_clex_bflmt) ctr_clex_emit_error( "Token buffer exhausted. Tokens may not exceed 255 bytes" );
// ctr_clex_tokvlen = i>2 ? i-1 : i; //leave one ':' for the KWM if more than two chars
// for(int v=0; v<ctr_clex_tokvlen; v++)
// ctr_clex_buffer[v] = ':';
// if(i > 2)
// ctr_code -= 2;
// // else
// // ctr_code;
// return CTR_TOKEN_REF;
// }
while (!isspace (c) && (c != '#' &&
c != '(' &&
c != ')' &&
c != '[' &&
c != ']' &&
c != '{' &&
c != '}' &&
c != '.' &&
c != ',' &&
c != '^' &&
(!((ctr_code + 2) < ctr_eofcode
&& (uint8_t) c == 226
&& ((uint8_t) * (ctr_code + 1) == 134)
&& ((uint8_t) * (ctr_code + 2) == 145))) && (c != ':') && c != '\'') && ctr_code != ctr_eofcode)
{
ctr_clex_buffer[i] = c;
ctr_clex_tokvlen++;
i++;
if (i > ctr_clex_bflmt)
{
ctr_clex_emit_error ("Token Buffer Exausted. Tokens may not exceed 255 bytes");
}
ctr_code++;
if (ctr_code == ctr_eofcode)
return CTR_TOKEN_REF;
c = *ctr_code;
}
return CTR_TOKEN_REF;
}
static int
ctr_clex_next_number ()
{
int t = *(++ctr_code);
return t >= '0' && t <= '9' ? t - '0' : 10 + toupper (t) - 'A';
}
/**
* CtrLexerEncodeUTF-8
*
* Encodes a code point using UTF-8
*/
int
ctr_clex_utf8_encode (char *out, uint32_t utf)
{
if (utf <= 0x7F)
{
// Plain ASCII
out[0] = (char) utf;
out[1] = 0;
return 1;
}
else if (utf <= 0x07FF)
{
// 2-byte unicode
out[0] = (char) (((utf >> 6) & 0x1F) | 0xC0);
out[1] = (char) (((utf >> 0) & 0x3F) | 0x80);
out[2] = 0;
return 2;
}
else if (utf <= 0xFFFF)
{
// 3-byte unicode
out[0] = (char) (((utf >> 12) & 0x0F) | 0xE0);
out[1] = (char) (((utf >> 6) & 0x3F) | 0x80);
out[2] = (char) (((utf >> 0) & 0x3F) | 0x80);
out[3] = 0;
return 3;
}
else if (utf <= 0x10FFFF)
{
// 4-byte unicode
out[0] = (char) (((utf >> 18) & 0x07) | 0xF0);
out[1] = (char) (((utf >> 12) & 0x3F) | 0x80);
out[2] = (char) (((utf >> 6) & 0x3F) | 0x80);
out[3] = (char) (((utf >> 0) & 0x3F) | 0x80);
out[4] = 0;
return 4;
}
else
{
// error - use replacement character
out[0] = (char) 0xEF;
out[1] = (char) 0xBF;
out[2] = (char) 0xBD;
out[3] = 0;
return 0;
}
}
/**
* CTRLexerStringReader
*
* Reads an entire string between a pair of quotes.
*/
char *
ctr_clex_readstr ()
{
char *strbuff;
char c;
long memblock = 1;
int escape;
char *beginbuff;
long page = 100; /* 100 byte pages */
size_t tracking_id;
if (ctr_string_interpolation == 6)
{
ctr_heap_free (ivarname);
ctr_string_interpolation = 0;
}
ctr_clex_tokvlen = 0;
strbuff = (char *) ctr_heap_allocate_tracked (memblock);
tracking_id = ctr_heap_get_latest_tracking_id ();
c = *ctr_code;
escape = 0;
beginbuff = strbuff;
while ( /* reading string in non-verbatim mode, read until the first non-escaped quote */
(ctr_clex_verbatim_mode == 0 && (c != '\'' || escape == 1)) ||
/* reading string in verbatim mode, read until the '<?' sequence */
(ctr_clex_verbatim_mode == 1 && (c != '<' || ((ctr_code + 1) >= ctr_eofcode) || *(ctr_code + 1) != '?') && ctr_code < ctr_eofcode))
{
/* enter interpolation mode ( $$x ) */
if (!ctr_clex_verbatim_mode && !escape && c == '$' && ((ctr_code + 1) < ctr_eofcode) && *(ctr_code + 1) == '$')
{
int q = 2;
while ((ctr_code + q) < ctr_eofcode && !isspace (*(ctr_code + q)) && *(ctr_code + q) != '$' && *(ctr_code + q) != '\'' && q < 255)
q++;
if (isspace (*(ctr_code + q)) || *(ctr_code + q) == '$' || *(ctr_code + q) == '\'')
{
ivarname = ctr_heap_allocate (q);
ivarlen = q - 2;
memcpy (ivarname, ctr_code + 2, q - 2);
ctr_string_interpolation = 1;
ctr_code_eoi = ctr_code + q + 0; /* '$','$' and the name ( name + 3 ) */
break;
}
}
if (c == '\n')
ctr_clex_line_number++;
if (escape == 1)
{
switch (c)
{
case 'n':
c = '\n';
break;
case 'r':
c = '\r';
break;
case 't':
c = '\t';
break;
case 'v':
c = '\v';
break;
case 'b':
c = '\b';
break;
case 'a':
c = '\a';
break;
case 'f':
c = '\f';
break;
case 'x':
{
int is_explicitly_enclosed;
ctr_code += (is_explicitly_enclosed = ctr_code + 1 < ctr_eofcode && *(ctr_code + 1) == '{');
c = 0;
while ((is_explicitly_enclosed) ?
*(ctr_code + 1) != '}' && ctr_clex_is_valid_digit_in_base (toupper (*(ctr_code + 1)), 16) :
ctr_clex_is_valid_digit_in_base (toupper (*(ctr_code + 1)), 16))
{
c = c * 16 + ctr_clex_next_number ();
}
if (is_explicitly_enclosed && *(++ctr_code) != '}')
{
//bitch about it...
static char err[] = "Expected a '}' to close the explicit hex embed, not a '$'";