diff options
Diffstat (limited to 'lib/parser.c')
-rw-r--r-- | lib/parser.c | 309 |
1 files changed, 309 insertions, 0 deletions
diff --git a/lib/parser.c b/lib/parser.c new file mode 100644 index 0000000..a2947e6 --- /dev/null +++ b/lib/parser.c @@ -0,0 +1,309 @@ +#include <stdio.h> +#include <limits.h> +#ifdef HAVE_CONFIG_H +#include "config.h" +#else +#define _(x) x +void exception(int, char *); +#endif +#include "global.h" +#include "parser.h" + + +typedef unsigned char op_t; + +typedef struct operator_t { + op_t op; + int pri, func; +} operator_t; + +static op_t pile_operators[PILEOP_MAX]; +static int pile_nestedcall[PILECALL_MAX]; + +static int pileop_pos = 0, pilecall_pos = 0; + +static operator_t operators[] = { + {',', 0, OP_NEST}, + {'+', 2, OP_PLUS}, + {'-', 2, OP_MOINS}, + {'*', 3, OP_MUL}, + {'/', 3, OP_DIV}, + {'+' + 128, 4, OP_PLUS_UNARY}, + {'-' + 128, 4, OP_MOINS_UNARY}, + {'(', 5, OP_FUNC_CALL}, + {'(' + 128, 5, OP_LPAREN}, + {'[', 5, OP_DECAL}, + {'[' + 128, 5, OP_DIRECT}, + {255, -1, -1} +}; + +static operator_t get_op(op_t op) +{ + int i; + + for (i = 0; operators[i].op != 255; i++) { + if (operators[i].op == op) + return operators[i]; + } + + return operators[i]; +} + +static int get_pri(op_t op) +{ + return get_op(op).pri; +} + +static int get_func(op_t op) +{ + return get_op(op).func; +} + +static op_t get_last_op(void) +{ + if (pileop_pos) + return pile_operators[pileop_pos - 1]; + else + return -1; +} + +static op_t pop_op(void) +{ + if (pileop_pos) + return pile_operators[--pileop_pos]; + return -1; +} + +static void push_op(op_t op) +{ + if (pileop_pos != PILEOP_MAX) + pile_operators[pileop_pos++] = op; + else + exception(-1, _("Too many nested operators in expression.\n")); + +} + +static int pop_call(void) +{ + if (pilecall_pos) + return pile_nestedcall[--pilecall_pos]; + return -1; +} + +static void increment_call(void) { + if (pilecall_pos) { + if (pile_nestedcall[pilecall_pos - 1] != -1) + pile_nestedcall[pilecall_pos - 1]++; + } +} + +static int get_last_call(void) { + if (pilecall_pos) + return pile_nestedcall[pilecall_pos - 1]; + return -1; +} + +static void push_call(int call) +{ + if (pilecall_pos != PILECALL_MAX) + pile_nestedcall[pilecall_pos++] = call; + else + exception(-1, _("Too many nested functions calls in expression.\n")); +} + +static char *getword(char *line, char *p) +{ + char o = 0, *d = line, instring = 0, gotbslash = 0; + + do { + if (instring) { + o = *(p++) = *line; + if (!gotbslash) { + switch (instring) { + case 1: + if (*line == '\'') { + instring = 0; + } + break; + case 2: + if (*line == '"') { + instring = 0; + } + break; + } + if (*line == '\\') gotbslash = 1; + } else { + gotbslash = 0; + } + } else { + if (*(line) == '\'') { + o = *(p++) = *line; + instring = 1; + } else if (*(line) == '"') { + o = *(p++) = *line; + instring = 2; + } else { + if (*(line) != ' ') { + o = *(p++) = *line; + } else if (d != line) { + *p = '\0'; + return line; + } + } + } + line++; + } while (((*line) && (*line != ')') && (*line != ']') && (*line != ';') && (get_func(*line) == -1) + && (get_func(o) == -1)) || (instring)); + *p = '\0'; + return line; +} + +void parse_line(char *line) +{ + char buffer[BUFSIZ], imm[BUFSIZ]; + op_t op; + int got_unary = 128, nbrargs; + + while (*line) { + line = getword(line, buffer); + if (get_func(buffer[0]) != -1) { + buffer[0] += got_unary; + if (got_unary) { + } + if (get_pri(buffer[0]) == -1) { + if (got_unary) { + exception(-1, _("Invalid unary operator")); + } else { + exception(-1, _("Invalid binary operator")); + } + } + while (get_pri(get_last_op()) >= get_pri(buffer[0]) && (((get_last_op() & 127) != '(') && ((get_last_op() & 127) != '['))) { + act_pile(get_func(pop_op())); + got_unary = 0; + } + if (buffer[0] == '(') { + push_call(0); + } + if (buffer[0] == ',') { + increment_call(); + } else push_op(buffer[0]); + got_unary = 128; + } else if ((buffer[0] == ';') || (buffer[0] == ')') || (buffer[0] == ']')) { + switch (buffer[0]) { + case ';': + while (pileop_pos) { + op = pop_op(); + if (op == '(') + exception(-1, _("Parse error: too much left parenthesis")); + act_pile(get_func(op)); + } + break; + case ')': + while (1) { + if (!pileop_pos) + exception(-1, _("Parse error: too much right parenthesis")); + op = pop_op(); + if (((op & 127) == '(')) + break; + if (((op & 127) == '[')) + exception(-1, _("Parse error: enclosure mismatch")); + act_pile(get_func(op)); + } + if (op == '(') { + nbrargs = pop_call(); + sprintf(imm, "%i", nbrargs); + push_pile(imm); + act_pile(get_func(op)); + } + got_unary = 0; + break; + case ']': + while (1) { + if (!pileop_pos) + exception(-1, _("Parse error: too much right parenthesis")); + op = pop_op(); + if (((op & 127) == '[')) + break; + if (((op & 127) == '(')) + exception(-1, _("Parse error: enclosure mismatch")); + act_pile(get_func(op)); + } + act_pile(get_func(op)); + got_unary = 0; + break; + } + } else if (((buffer[0] >= 'A') && (buffer[0] <= 'Z')) || ((buffer[0] >= 'a') && (buffer[0] <= 'z')) + || ((buffer[0] >= '0') && (buffer[0] <= '9')) || (buffer[0] == '_') || (buffer[0] == '"') || (buffer[0] == '\'')) { + push_pile(buffer); + got_unary = 0; + if (!get_last_call()) increment_call(); + } else if (buffer[0]) { + exception(-1, _("Invalid character")); + } + } +} + +#ifndef HAVE_CONFIG_H + +void exception(int level, char *msg) +{ + fprintf(stderr, "%s\n", msg); + exit(level); +} + +void push_pile(char *word) +{ + printf("%s ", word); +} + +void act_pile(int func) +{ + char op; + + switch (func) { + case OP_PLUS: + op = '+'; + break; + case OP_MOINS: + op = '-'; + break; + case OP_DIV: + op = '/'; + break; + case OP_MUL: + op = '*'; + break; + case OP_PLUS_UNARY: + op = '\0'; + break; + case OP_MOINS_UNARY: + op = '|'; + break; + case OP_FUNC_CALL: + op = '@'; + break; + case OP_DECAL: + op = '['; + break; + case OP_DIRECT: + op = '{'; + break; + } + printf("%c ", op); +} + +void main(void) +{ + parse_line("ADD R18, R20, 39;"); + printf("\n\n"); fflush(stdout); + parse_line("MOV R31, Bidule[48 + R12];"); + printf("\n\n"); fflush(stdout); + parse_line("MOV R12, [R3];"); + printf("\n\n"); fflush(stdout); + parse_line("MOV R22, Truc[(3+2)*8];"); + printf("\n\n"); fflush(stdout); + parse_line("Trucmuche DB \"Test de chaîne complète avec des opérateurs comme le + et le - ...\""); + printf("\n\n"); fflush(stdout); +} + +#endif |