From 4e9c5ae1db57ab4c3329dc7e0d1ad9b94e3d94bb Mon Sep 17 00:00:00 2001
From: Jan Breuer <jan.breuer@jaybee.cz>
Date: 周三, 13 3月 2013 01:43:43 +0800
Subject: [PATCH] Divide parser core functions
---
libscpi/src/parser.c | 118 ++++++++++++++++++++++++++++++++++++----------------------
1 files changed, 73 insertions(+), 45 deletions(-)
diff --git a/libscpi/src/parser.c b/libscpi/src/parser.c
index b5a5a9b..c22ae6c 100644
--- a/libscpi/src/parser.c
+++ b/libscpi/src/parser.c
@@ -46,8 +46,8 @@
static size_t cmdSeparatorPos(const char * cmd, size_t len);
static size_t cmdTerminatorPos(const char * cmd, size_t len);
static size_t cmdlineSeparatorPos(const char * cmd, size_t len);
-static char * cmdlineSeparator(const char * cmd, size_t len);
-static char * cmdlineTerminator(const char * cmd, size_t len);
+static const char * cmdlineSeparator(const char * cmd, size_t len);
+static const char * cmdlineTerminator(const char * cmd, size_t len);
static const char * cmdlineNext(const char * cmd, size_t len);
static bool_t cmdMatch(const char * pattern, const char * cmd, size_t len);
@@ -114,7 +114,7 @@
* @return position of terminator or len
*/
size_t cmdTerminatorPos(const char * cmd, size_t len) {
- char * terminator = strnpbrk(cmd, len, "; \r\n\t");
+ const char * terminator = strnpbrk(cmd, len, "; \r\n\t");
if (terminator == NULL) {
return len;
} else {
@@ -128,7 +128,7 @@
* @param len - max search length
* @return pointer to line separator or NULL
*/
-char * cmdlineSeparator(const char * cmd, size_t len) {
+const char * cmdlineSeparator(const char * cmd, size_t len) {
return strnpbrk(cmd, len, ";\r\n");
}
@@ -138,7 +138,7 @@
* @param len - max search length
* @return pointer to command line terminator or NULL
*/
-char * cmdlineTerminator(const char * cmd, size_t len) {
+const char * cmdlineTerminator(const char * cmd, size_t len) {
return strnpbrk(cmd, len, "\r\n");
}
@@ -149,7 +149,7 @@
* @return position of line separator or len
*/
size_t cmdlineSeparatorPos(const char * cmd, size_t len) {
- char * separator = cmdlineSeparator(cmd, len);
+ const char * separator = cmdlineSeparator(cmd, len);
if (separator == NULL) {
return len;
} else {
@@ -276,14 +276,66 @@
* @return pocet zapsanych znaku
*/
static inline size_t writeNewLine(scpi_t * context) {
- size_t len;
if (context->output_count > 0) {
+ size_t len;
len = writeData(context, "\r\n", 2);
flushData(context);
return len;
} else {
return 0;
}
+}
+
+/**
+ * Process command
+ * @param context
+ */
+static void processCommand(scpi_t * context) {
+ context->cmd_error = FALSE;
+ context->output_count = 0;
+ context->input_count = 0;
+
+ const scpi_command_t * cmd = context->paramlist.cmd;
+
+ SCPI_DEBUG_COMMAND(context);
+ /* if callback exists - call command callback*/
+ if (cmd->callback != NULL) {
+ if ((cmd->callback(context) != SCPI_RES_OK) && !context->cmd_error) {
+ SCPI_ErrorPush(context, SCPI_ERROR_EXECUTION_ERROR);
+ }
+ }
+
+ /* conditionaly write new line */
+ writeNewLine(context);
+
+ /* skip all whitespaces */
+ paramSkipWhitespace(context);
+
+ /* set error if command callback did not read all parameters */
+ if (context->paramlist.length != 0 && !context->cmd_error) {
+ SCPI_ErrorPush(context, SCPI_ERROR_PARAMETER_NOT_ALLOWED);
+ }
+}
+
+/**
+ * Cycle all patterns and search matching pattern. Execute command callback.
+ * @param context
+ * @result TRUE if context->paramlist is filled with correct values
+ */
+static bool_t findCommand(scpi_t * context, const char * cmdline_ptr, size_t cmdline_len, size_t cmd_len) {
+ int32_t i;
+ const scpi_command_t * cmd;
+
+ for (i = 0; context->cmdlist[i].pattern != NULL; i++) {
+ cmd = &context->cmdlist[i];
+ if (cmdMatch(cmd->pattern, cmdline_ptr, cmd_len)) {
+ context->paramlist.cmd = cmd;
+ context->paramlist.parameters = cmdline_ptr + cmd_len;
+ context->paramlist.length = cmdline_len - cmd_len;
+ return TRUE;
+ }
+ }
+ return FALSE;
}
/**
@@ -294,53 +346,29 @@
* @return 1 if the last evaluated command was found
*/
int SCPI_Parse(scpi_t * context, const char * data, size_t len) {
- int32_t i;
int result = 0;
const char * cmdline_end = data + len;
const char * cmdline_ptr = data;
size_t cmd_len;
+ size_t cmdline_len;
+
if (context == NULL) {
return -1;
}
while (cmdline_ptr < cmdline_end) {
-
result = 0;
cmd_len = cmdTerminatorPos(cmdline_ptr, cmdline_end - cmdline_ptr);
+ cmdline_len = cmdlineSeparatorPos(cmdline_ptr, cmdline_end - cmdline_ptr);
if (cmd_len > 0) {
- for (i = 0; context->cmdlist[i].pattern != NULL; i++) {
- if (cmdMatch(context->cmdlist[i].pattern, cmdline_ptr, cmd_len)) {
- if (context->cmdlist[i].callback != NULL) {
- context->cmd_error = FALSE;
- context->paramlist.cmd = &context->cmdlist[i];
- context->paramlist.parameters = cmdline_ptr + cmd_len;
- context->paramlist.length = cmdlineSeparatorPos(context->paramlist.parameters, cmdline_end - context->paramlist.parameters);
- context->output_count = 0;
- context->input_count = 0;
-
- SCPI_DEBUG_COMMAND(context);
- if ((context->cmdlist[i].callback(context) != SCPI_RES_OK) && !context->cmd_error) {
- SCPI_ErrorPush(context, SCPI_ERROR_EXECUTION_ERROR);
- }
-
- writeNewLine(context); // conditionaly write new line
-
- paramSkipWhitespace(context);
- if (context->paramlist.length != 0 && !context->cmd_error) {
- SCPI_ErrorPush(context, SCPI_ERROR_PARAMETER_NOT_ALLOWED);
- }
-
- result = 1;
- break;
- }
- }
- }
- if (result == 0) {
+ if(findCommand(context, cmdline_ptr, cmdline_len, cmd_len)) {
+ processCommand(context);
+ result = 1;
+ } else {
SCPI_ErrorPush(context, SCPI_ERROR_UNDEFINED_HEADER);
}
}
cmdline_ptr = cmdlineNext(cmdline_ptr, cmdline_end - cmdline_ptr);
-
}
return result;
}
@@ -369,14 +397,14 @@
*/
int SCPI_Input(scpi_t * context, const char * data, size_t len) {
int result = 0;
- size_t buffer_free;
- char * cmd_term;
- int ws;
+ const char * cmd_term;
if (len == 0) {
context->buffer.data[context->buffer.position] = 0;
result = SCPI_Parse(context, context->buffer.data, context->buffer.position);
context->buffer.position = 0;
} else {
+ size_t buffer_free;
+ int ws;
buffer_free = context->buffer.length - context->buffer.position;
if (len > (buffer_free - 1)) {
return -1;
@@ -523,7 +551,7 @@
* @return
*/
bool_t SCPI_ParamInt(scpi_t * context, int32_t * value, bool_t mandatory) {
- char * param;
+ const char * param;
size_t param_len;
size_t num_len;
@@ -553,7 +581,7 @@
* @return
*/
bool_t SCPI_ParamDouble(scpi_t * context, double * value, bool_t mandatory) {
- char * param;
+ const char * param;
size_t param_len;
size_t num_len;
@@ -583,7 +611,7 @@
* @param mandatory
* @return
*/
-bool_t SCPI_ParamString(scpi_t * context, char ** value, size_t * len, bool_t mandatory) {
+bool_t SCPI_ParamString(scpi_t * context, const char ** value, size_t * len, bool_t mandatory) {
size_t length;
if (!value || !len) {
@@ -614,7 +642,7 @@
* @param mandatory
* @return
*/
-bool_t SCPI_ParamText(scpi_t * context, char ** value, size_t * len, bool_t mandatory) {
+bool_t SCPI_ParamText(scpi_t * context, const char ** value, size_t * len, bool_t mandatory) {
size_t length;
if (!value || !len) {
--
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