Diff: util/lex.cpp

Revision:

93:61d44636f020

Child:

98:e369fc75c000

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/util/lex.cpp	Mon Apr 20 15:04:23 2015 +0000
@@ -0,0 +1,120 @@
+#include <ctype.h>
+#include <string.h>
+#include "lex.h"
+
+const char* skipHTTPHeader(const char* p)
+{
+        const char* ptr = p;
+        if (p)
+                ptr = strstr(p, "\r\n\r\n");
+
+        if (ptr) {
+                return ptr+4;
+        } else {
+                return NULL;
+        }
+}
+
+const char* lex(const char *p, Token& t)
+{
+        if (p == NULL) {
+                t.type = Token::NONE;
+                t.p = NULL;
+                t.len = 0;
+                return NULL;
+        }
+        t.type = Token::NONE;
+        size_t i = 0;
+        while (p[i] && isspace(p[i])) ++i;
+        bool opening = false;
+        if (p[i] == '"') {
+                opening = true;
+                ++i;
+        }
+        size_t j = i;
+        size_t dots = 0;
+        bool hasChar = false;
+        bool escaping = false;
+        bool hasDigit = false;
+        for (;p[j]; ++j) {
+                if (p[j] == '"') {
+                        if (!opening) { // inline quote
+                                t.type = Token::ERROR;
+                        } else if (!escaping) { // escaping quote
+                                escaping = true;
+                        } else {
+                                hasChar = true;
+                                escaping = false;
+                        }
+                } else {
+                        if (escaping && opening) {
+                                break;
+                        } else if (p[j] == '.') {
+                                hasChar = true;
+                                dots++;
+                        } else if (p[j] == ',' || iscntrl(p[j])) {
+                                if (opening)
+                                        hasChar = true;
+                                else
+                                        break;
+                        } else if (isdigit(p[j])) {
+                                hasDigit = true;
+                        } else {
+                                hasChar = true;
+                        }
+                }
+        }
+        t.p = p+i;
+        size_t k = j;
+        while (k > i && (p[k]==',' || isspace(p[k]))) --k;
+        t.len = k-i+1;
+        if (escaping && opening) {
+                opening = false;
+                t.len -= 1;
+        }
+        if (t.type != Token::ERROR) {
+                if (opening) {
+                        t.type = Token::ERROR;
+                } else if (hasChar) {
+                        t.type = Token::STRING;
+                } else if (hasDigit) {
+                        switch (dots) {
+                        case 0: t.type = Token::INT; break;
+                        case 1: t.type = Token::FLOAT; break;
+                        default: t.type = Token::STRING; break;
+                        }
+                } else {
+                        t.type = Token::NONE;
+                }
+        }
+        while (p[j]) {
+                if (isspace(p[j])) {
+                        ++j;
+                } else if (p[j]==',') {
+                        ++j;
+                        break;
+                } else {
+                        break;
+                }
+        }
+        return p+j;
+}
+
+size_t strncpyEscape(char* dest, const char *source, size_t num)
+{
+        if (source == NULL) return 0;
+        size_t i = 0, j = 0;
+        for (bool escaping = false; i < num; ++i) {
+                if (source[i] != '"') {
+                        dest[j++] = source[i];
+                } else {
+                        if (escaping) {
+                                dest[j++] = source[i];
+                                escaping = false;
+                        } else {
+                                escaping = true;
+                        }
+                }
+        }
+        return j;
+}