Diff: ucCmdParser.c

Revision:

0:9e2fc73e5a12

diff -r 000000000000 -r 9e2fc73e5a12 ucCmdParser.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucCmdParser.c	Mon Oct 12 21:09:07 2015 +0000
@@ -0,0 +1,121 @@
+#include <string.h>
+#include "ucmd_internal.h"
+
+static ucBool is_char_white_space(char c) {
+    /* The native isspace function in ctype.h was giving some weird behavior in the uVision simulator. */
+    return (((c >= 0x09) && (c <= 0x0D)) || (c == 0x020)) ? ucBool_TRUE : ucBool_FALSE;
+}
+
+static char is_char_a_quote(char c) {
+    if (c == '"') return '"';
+    if (c == '\'') return '\'';
+    return 0;
+}
+
+static void remove_cmd_char(char *cmd, int index) {
+    if (NULL == cmd) return;
+    while (cmd[index] != uc_cmd_terminator) {
+        cmd[index] = cmd[index + 1];
+        index++;
+    }
+}
+
+static ucCmdTok *parse(ucCmdParser *p, char *cmd) {
+    int i, j, len;
+    char quote, current_quote;
+
+    if (NULL == cmd) return NULL;
+
+    /* get the length of the whole command */
+    len = strlen(cmd);
+
+    /* replace any command-terminating characters in the string with a space */
+    for (i = 0; i < len; i++) {
+        if (cmd[i] == uc_cmd_terminator) {
+            cmd[i] = ' ';
+        }
+    }
+
+    /* append a command terminator */
+    cmd[len + 1] = uc_cmd_terminator;
+
+    /* loop through each character in the command */
+    i = 0;
+    current_quote = 0;
+    while (cmd[i] != uc_cmd_terminator) {
+
+        /* check if this command character is a quote */
+        quote = is_char_a_quote(cmd[i]);
+        if (quote) {
+
+            /* check if this is our current quote */
+            if (quote == current_quote) {
+
+                /* remove the quote only if this is
+                   not an empty quote */
+                if ((0 < i) && (current_quote != cmd[i - 1])) {
+                    cmd[i] = ' ';
+                }
+
+                /* the quoted item is finished */
+                current_quote = 0;
+            }
+            else {
+
+                /* check if we're NOT in a quote */
+                if (!current_quote) {
+
+                    /* we've started a quote */
+                    current_quote = quote;
+
+                    /* remove the quote character 
+                       only if this is not an empty
+                       quote */
+                    if (current_quote != cmd[i + 1]) {
+                        remove_cmd_char(cmd, i);
+                    }
+                }
+            }
+        }
+
+        /* check if we're not in a quoted string */
+        if (!current_quote) {
+
+            /* check if we're in a token separator */
+            if (is_char_white_space(cmd[i])) {
+
+                /* separate this token */
+                cmd[i] = ucTok_separator;
+
+                /* remove any remaining white space */
+                j = i + 1;
+                while (is_char_white_space(cmd[j])) {
+                    remove_cmd_char(cmd, j);
+                }
+            }
+        }
+
+        /* go to the next character */
+        i++;
+    }
+
+    /* we're done parsing */
+    return (ucCmdTok*)cmd;
+}
+
+ucCmdTok *ucCmdParser_parse(ucCmdParser *p, char *cmd) {
+    if (NULL == p) return NULL;
+    if (NULL == p->parse) return NULL;
+    return p->parse(p, cmd);
+}
+
+ucCmdParser *ucCmdParser_get_instance(void) {
+    static ucCmdParser instance;
+    static ucCmdParser *p = NULL;
+    if (NULL == p) {
+        p = &instance;
+        p->parse = parse;
+    }
+    return p;
+}
+