From 4d39507183e0ace2d73f04817a398e858b66b677 Mon Sep 17 00:00:00 2001
From: Jan Breuer <jan.breuer@jaybee.cz>
Date: 周五, 22 3月 2013 01:40:22 +0800
Subject: [PATCH] Update lexer, start of implementing parser
---
libscpi/src/units.c | 160 ++++++++++++++++++++++++++++++++++------------------
1 files changed, 104 insertions(+), 56 deletions(-)
diff --git a/libscpi/src/units.c b/libscpi/src/units.c
index a22f770..493c4ce 100644
--- a/libscpi/src/units.c
+++ b/libscpi/src/units.c
@@ -62,71 +62,93 @@
*/
const scpi_unit_def_t scpi_units_def[] = {
/* voltage */
- { .name = "UV", .unit = SCPI_UNIT_VOLT, .mult = 1e-6},
- { .name = "MV", .unit = SCPI_UNIT_VOLT, .mult = 1e-3},
- { .name = "V", .unit = SCPI_UNIT_VOLT, .mult = 1},
- { .name = "KV", .unit = SCPI_UNIT_VOLT, .mult = 1e3},
+ {/* name */ "UV", /* unit */ SCPI_UNIT_VOLT, /* mult */ 1e-6},
+ {/* name */ "MV", /* unit */ SCPI_UNIT_VOLT, /* mult */ 1e-3},
+ {/* name */ "V", /* unit */ SCPI_UNIT_VOLT, /* mult */ 1},
+ {/* name */ "KV", /* unit */ SCPI_UNIT_VOLT, /* mult */ 1e3},
/* current */
- { .name = "UA", .unit = SCPI_UNIT_AMPER, .mult = 1e-6},
- { .name = "MA", .unit = SCPI_UNIT_AMPER, .mult = 1e-3},
- { .name = "A", .unit = SCPI_UNIT_AMPER, .mult = 1},
- { .name = "KA", .unit = SCPI_UNIT_AMPER, .mult = 1e3},
+ {/* name */ "UA", /* unit */ SCPI_UNIT_AMPER, /* mult */ 1e-6},
+ {/* name */ "MA", /* unit */ SCPI_UNIT_AMPER, /* mult */ 1e-3},
+ {/* name */ "A", /* unit */ SCPI_UNIT_AMPER, /* mult */ 1},
+ {/* name */ "KA", /* unit */ SCPI_UNIT_AMPER, /* mult */ 1e3},
/* resistance */
- { .name = "OHM", .unit = SCPI_UNIT_OHM, .mult = 1},
- { .name = "KOHM", .unit = SCPI_UNIT_OHM, .mult = 1e3},
- { .name = "MOHM", .unit = SCPI_UNIT_OHM, .mult = 1e6},
+ {/* name */ "OHM", /* unit */ SCPI_UNIT_OHM, /* mult */ 1},
+ {/* name */ "KOHM", /* unit */ SCPI_UNIT_OHM, /* mult */ 1e3},
+ {/* name */ "MOHM", /* unit */ SCPI_UNIT_OHM, /* mult */ 1e6},
/* frequency */
- { .name = "HZ", .unit = SCPI_UNIT_HERTZ, .mult = 1},
- { .name = "KHZ", .unit = SCPI_UNIT_HERTZ, .mult = 1e3},
- { .name = "MHZ", .unit = SCPI_UNIT_HERTZ, .mult = 1e6},
- { .name = "GHZ", .unit = SCPI_UNIT_HERTZ, .mult = 1e9},
+ {/* name */ "HZ", /* unit */ SCPI_UNIT_HERTZ, /* mult */ 1},
+ {/* name */ "KHZ", /* unit */ SCPI_UNIT_HERTZ, /* mult */ 1e3},
+ {/* name */ "MHZ", /* unit */ SCPI_UNIT_HERTZ, /* mult */ 1e6},
+ {/* name */ "GHZ", /* unit */ SCPI_UNIT_HERTZ, /* mult */ 1e9},
/* temperature */
- { .name = "CEL", .unit = SCPI_UNIT_CELSIUS, .mult = 1},
+ {/* name */ "CEL", /* unit */ SCPI_UNIT_CELSIUS, /* mult */ 1},
/* time */
- { .name = "PS", .unit = SCPI_UNIT_SECONDS, .mult = 1e-12},
- { .name = "NS", .unit = SCPI_UNIT_SECONDS, .mult = 1e-9},
- { .name = "US", .unit = SCPI_UNIT_SECONDS, .mult = 1e-6},
- { .name = "MS", .unit = SCPI_UNIT_SECONDS, .mult = 1e-3},
- { .name = "S", .unit = SCPI_UNIT_SECONDS, .mult = 1},
- { .name = "MIN", .unit = SCPI_UNIT_SECONDS, .mult = 60},
- { .name = "HR", .unit = SCPI_UNIT_SECONDS, .mult = 3600},
+ {/* name */ "PS", /* unit */ SCPI_UNIT_SECONDS, /* mult */ 1e-12},
+ {/* name */ "NS", /* unit */ SCPI_UNIT_SECONDS, /* mult */ 1e-9},
+ {/* name */ "US", /* unit */ SCPI_UNIT_SECONDS, /* mult */ 1e-6},
+ {/* name */ "MS", /* unit */ SCPI_UNIT_SECONDS, /* mult */ 1e-3},
+ {/* name */ "S", /* unit */ SCPI_UNIT_SECONDS, /* mult */ 1},
+ {/* name */ "MIN", /* unit */ SCPI_UNIT_SECONDS, /* mult */ 60},
+ {/* name */ "HR", /* unit */ SCPI_UNIT_SECONDS, /* mult */ 3600},
SCPI_UNITS_LIST_END,
};
+/*
+ * Special number values definition
+ */
const scpi_special_number_def_t scpi_special_numbers_def[] = {
- { .name = "MINimum", .type = SCPI_NUM_MIN},
- { .name = "MAXimum", .type = SCPI_NUM_MAX},
- { .name = "DEFault", .type = SCPI_NUM_DEF},
- { .name = "UP", .type = SCPI_NUM_UP},
- { .name = "DOWN", .type = SCPI_NUM_DOWN},
- { .name = "NAN", .type = SCPI_NUM_NAN},
- { .name = "INF", .type = SCPI_NUM_INF},
- { .name = "NINF", .type = SCPI_NUM_NINF},
+ {/* name */ "MINimum", /* type */ SCPI_NUM_MIN},
+ {/* name */ "MAXimum", /* type */ SCPI_NUM_MAX},
+ {/* name */ "DEFault", /* type */ SCPI_NUM_DEF},
+ {/* name */ "UP", /* type */ SCPI_NUM_UP},
+ {/* name */ "DOWN", /* type */ SCPI_NUM_DOWN},
+ {/* name */ "NAN", /* type */ SCPI_NUM_NAN},
+ {/* name */ "INF", /* type */ SCPI_NUM_INF},
+ {/* name */ "NINF", /* type */ SCPI_NUM_NINF},
SCPI_SPECIAL_NUMBERS_LIST_END,
};
-static scpi_special_number_t translateSpecialNumber(const scpi_special_number_def_t * specs, const char * str, size_t len) {
+/**
+ * Match string constant to one of special number values
+ * @param specs specifications of special numbers (patterns)
+ * @param str string to be recognised
+ * @param len length of string
+ * @param value resultin value
+ * @return TRUE if str matches one of specs patterns
+ */
+static bool_t translateSpecialNumber(const scpi_special_number_def_t * specs, const char * str, size_t len, scpi_number_t * value) {
int i;
+ value->value = 0.0;
+ value->unit = SCPI_UNIT_NONE;
+ value->type = SCPI_NUM_NUMBER;
+
if (specs == NULL) {
- return SCPI_NUM_NUMBER;
+ return FALSE;
}
-
+
for (i = 0; specs[i].name != NULL; i++) {
if (matchPattern(specs[i].name, strlen(specs[i].name), str, len)) {
- return specs[i].type;
+ value->type = specs[i].type;
+ return TRUE;
}
}
- return SCPI_NUM_NUMBER;
+ return FALSE;
}
+/**
+ * Convert special number type to its string representation
+ * @param specs specifications of special numbers (patterns)
+ * @param type type of special number
+ * @return String representing special number or NULL
+ */
static const char * translateSpecialNumberInverse(const scpi_special_number_def_t * specs, scpi_special_number_t type) {
int i;
@@ -143,6 +165,13 @@
return NULL;
}
+/**
+ * Convert string describing unit to its representation
+ * @param units units patterns
+ * @param unit text representation of unknown unit
+ * @param len length of text representation
+ * @return pointer of related unit definition or NULL
+ */
static const scpi_unit_def_t * translateUnit(const scpi_unit_def_t * units, const char * unit, size_t len) {
int i;
@@ -159,6 +188,12 @@
return NULL;
}
+/**
+ * Convert unit definition to string
+ * @param units units definitions (patterns)
+ * @param unit type of unit
+ * @return string representation of unit
+ */
static const char * translateUnitInverse(const scpi_unit_def_t * units, const scpi_unit_t unit) {
int i;
@@ -175,7 +210,15 @@
return NULL;
}
-static bool_t transformNumber(const scpi_unit_def_t * units, const char * unit, size_t len, scpi_number_t * value) {
+/**
+ * Transform number to base units
+ * @param context
+ * @param unit text representation of unit
+ * @param len length of text representation
+ * @param value preparsed numeric value
+ * @return TRUE if value parameter was converted to base units
+ */
+static bool_t transformNumber(scpi_t * context, const char * unit, size_t len, scpi_number_t * value) {
size_t s;
const scpi_unit_def_t * unitDef;
s = skipWhitespace(unit, len);
@@ -185,9 +228,10 @@
return TRUE;
}
- unitDef = translateUnit(units, unit + s, len - s);
+ unitDef = translateUnit(context->units, unit + s, len - s);
if (unitDef == NULL) {
+ SCPI_ErrorPush(context, SCPI_ERROR_INVALID_SUFFIX);
return FALSE;
}
@@ -206,47 +250,51 @@
*/
bool_t SCPI_ParamNumber(scpi_t * context, scpi_number_t * value, bool_t mandatory) {
bool_t result;
- char * param;
+ const char * param;
size_t len;
size_t numlen;
+ /* read parameter and shift to the next one */
result = SCPI_ParamString(context, ¶m, &len, mandatory);
+ /* value not initializes */
if (!value) {
return FALSE;
}
+ value->type = SCPI_NUM_DEF;
+
+ /* if parameter was not found, return TRUE or FALSE according
+ * to fact that parameter was mandatory or not */
if (!result) {
- if (mandatory) {
- return FALSE;
- } else {
- value->type = SCPI_NUM_DEF;
- return TRUE;
- }
+ return mandatory ? FALSE : TRUE;
}
- value->unit = SCPI_UNIT_NONE;
- value->value = 0.0;
- value->type = translateSpecialNumber(context->special_numbers, param, len);
-
- if (value->type != SCPI_NUM_NUMBER) {
- // found special type
+ /* convert string to special number type */
+ if (translateSpecialNumber(context->special_numbers, param, len, value)) {
+ /* found special type */
return TRUE;
}
+ /* convert text from double - no special type */
numlen = strToDouble(param, &value->value);
+ /* transform units of value */
if (numlen <= len) {
- if (transformNumber(context->units, param + numlen, len - numlen, value)) {
- return TRUE;
- } else {
- SCPI_ErrorPush(context, SCPI_ERROR_INVALID_SUFFIX);
- }
+ return transformNumber(context, param + numlen, len - numlen, value);
}
return FALSE;
}
+/**
+ * Convert scpi_number_t to string
+ * @param context
+ * @param value number value
+ * @param str target string
+ * @param len max length of string
+ * @return number of chars written to string
+ */
size_t SCPI_NumberToStr(scpi_t * context, scpi_number_t * value, char * str, size_t len) {
const char * type;
const char * unit;
--
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