From ad40bb6762360183586b9e434b45606154b52aa1 Mon Sep 17 00:00:00 2001
From: Jan Breuer <jan.breuer@jaybee.cz>
Date: ćšć, 21 3æ 2013 19:49:34 +0800
Subject: [PATCH] Modify lexer according to IEEE 488.2
---
libscpi/src/lexer.c | 484 ++++++++++++++++++++++++-----------------------------
1 files changed, 218 insertions(+), 266 deletions(-)
diff --git a/libscpi/src/lexer.c b/libscpi/src/lexer.c
index 197acdc..f145ca0 100644
--- a/libscpi/src/lexer.c
+++ b/libscpi/src/lexer.c
@@ -48,8 +48,6 @@
TokBinnum,
TokProgramMnemonic,
TokDecimalNumericProgramData,
- TokMantisa,
- TokExponent,
TokSuffixProgramData,
TokSingleQuoteProgramData,
TokDoubleQuoteProgramData,
@@ -130,6 +128,8 @@
}
/* skip characters */
+/* 7.4.1 <PROGRAM MESSAGE UNIT SEPARATOR>*/
+// TODO: static int skipProgramMessageUnitSeparator(lex_state_t * state)
static int skipWs(lex_state_t * state) {
int someSpace = 0;
while(!iseos(state) && isws(state->pos[0])) {
@@ -139,6 +139,12 @@
return someSpace;
}
+
+/* 7.4.2 <PROGRAM DATA SEPARATOR> */
+// static int skipProgramDataSeparator(lex_state_t * state)
+
+/* 7.5.2 <PROGRAM MESSAGE TERMINATOR> */
+// static int skipProgramMessageTerminator(lex_state_t * state)
static int skipDigit(lex_state_t * state) {
if(!iseos(state) && isdigit(state->pos[0])) {
@@ -212,6 +218,7 @@
}
}
+/* 7.6.1.2 <COMMAND PROGRAM HEADER> */
static int skipProgramMnemonic(lex_state_t * state) {
const char * startPos = state->pos;
if(!iseos(state) && isalpha(state->pos[0])) {
@@ -237,225 +244,11 @@
} else {
token->type = TokUnknown;
}
-
- return token->len;
-}
-
-int SCPI_LexHexnum(lex_state_t * state, token_t * token) {
- token->ptr = state->pos;
-
- if(skipChr(state, '#')) {
- if(!iseos(state) && isH(state->pos[0])) {
- state->pos++;
-
- while(!iseos(state) && isxdigit(state->pos[0])) {
- state->pos++;
- }
-
- } else {
- state->pos--;
- }
- }
-
- token->len = state->pos - token->ptr;
- if(token->len > 0) {
- token->type = TokHexnum;
- } else {
- token->type = TokUnknown;
- }
return token->len;
}
-int SCPI_LexBinnum(lex_state_t * state, token_t * token) {
- token->ptr = state->pos;
-
- if(skipChr(state, '#')) {
- if(!iseos(state) && isB(state->pos[0])) {
- state->pos++;
-
- while(!iseos(state) && isbdigit(state->pos[0])) {
- state->pos++;
- }
-
- } else {
- state->pos--;
- }
- }
-
- token->len = state->pos - token->ptr;
- if(token->len > 0) {
- token->type = TokBinnum;
- } else {
- token->type = TokUnknown;
- }
-
- return token->len;
-}
-
-int SCPI_LexOctnum(lex_state_t * state, token_t * token) {
- token->ptr = state->pos;
-
- if(skipChr(state, '#')) {
- if(!iseos(state) && isQ(state->pos[0])) {
- state->pos++;
-
- while(!iseos(state) && isqdigit(state->pos[0])) {
- state->pos++;
- }
-
- } else {
- state->pos--;
- }
- }
-
- token->len = state->pos - token->ptr;
- if(token->len > 0) {
- token->type = TokOctnum;
- } else {
- token->type = TokUnknown;
- }
-
- return token->len;
-}
-
-int SCPI_LexNondecimalNumericData(lex_state_t * state, token_t * token) {
- int res;
-
- res = SCPI_LexHexnum(state, token);
- if(res > 0) return res;
-
- res = SCPI_LexBinnum(state, token);
- if(res > 0) return res;
-
- res = SCPI_LexOctnum(state, token);
- if(res > 0) return res;
-
- return 0;
-}
-
-int SCPI_LexProgramMnemonic(lex_state_t * state, token_t * token) {
- token->ptr = state->pos;
-
- if(!iseos(state) && isalpha(state->pos[0])) {
- state->pos++;
- while(!iseos(state) && (isalnum(state->pos[0]) || ischr(state, '_'))) {
- state->pos++;
- }
- }
-
- token->len = state->pos - token->ptr;
- if(token->len > 0) {
- token->type = TokProgramMnemonic;
- } else {
- token->type = TokUnknown;
- }
-
- return token->len;
-}
-
-int SCPI_LexMantisa(lex_state_t * state, token_t * token) {
- int someNumbers = 0;
- token->ptr = state->pos;
-
- skipPlusmn(state);
-
- someNumbers += skipNumbers(state);
-
- if(skipChr(state, '.')) {
- someNumbers += skipNumbers(state);
- }
-
- token->len = state->pos - token->ptr;
- if((token->len > 0) && (someNumbers > 0)) {
- token->type = TokMantisa;
- } else {
- token->type = TokUnknown;
- state->pos = token->ptr;
- token->len = 0;
- }
-
- return token->len;
-}
-
-int SCPI_LexExponent(lex_state_t * state, token_t * token) {
- int someNumbers = 0;
- token->ptr = state->pos;
-
- if(!iseos(state) && isE(state->pos[0])) {
- state->pos++;
-
- skipWs(state);
-
- skipPlusmn(state);
-
- someNumbers += skipNumbers(state);
- }
-
- token->len = state->pos - token->ptr;
- if((token->len > 0) && (someNumbers > 0)) {
- token->type = TokExponent;
- } else {
- token->type = TokUnknown;
- state->pos = token->ptr;
- token->len = 0;
- }
-
- return token->len;
-}
-
-int SCPI_LexDecimalNumericProgramData(lex_state_t * state, token_t * token) {
- token_t exponent;
-
- if (SCPI_LexMantisa(state, token)) {
- skipWs(state);
- SCPI_LexExponent(state, &exponent);
- }
-
- if((token->len > 0) && (exponent.len > 0)) {
- token->type = TokDecimalNumericProgramData;
- token->len = (exponent.ptr + exponent.len) - token->ptr;
- } else if (token->len > 0) {
- token->type = TokDecimalNumericProgramData;
- state->pos = token->ptr + token->len;
- } else {
- token->type = TokUnknown;
- state->pos = token->ptr;
- token->len = 0;
- }
-
- return token->len;
-}
-
-int SCPI_LexSuffixProgramData(lex_state_t * state, token_t * token) {
- token->ptr = state->pos;
-
- skipChr(state, '/');
-
- // TODO: strict parsing : SLASH? (ALPHA+ (MINUS? DIGIT)?) ((SLASH | DOT) (ALPHA+ (MINUS? DIGIT)?))*
- if (skipAlpha(state)) {
- skipChr(state, '-');
- skipDigit(state);
-
- while (skipSlashDot(state)) {
- skipAlpha(state);
- skipChr(state, '-');
- skipDigit(state);
- }
- }
-
- token->len = state->pos - token->ptr;
- if((token->len > 0)) {
- token->type = TokSuffixProgramData;
- } else {
- token->type = TokUnknown;
- state->pos = token->ptr;
- token->len = 0;
- }
-
- return token->len;
-}
-
+/* 7.6.1 <COMMAND PROGRAM HEADER> */
int SCPI_LexCommonProgramHeader(lex_state_t * state, token_t * token) {
token->ptr = state->pos;
@@ -474,7 +267,7 @@
state->pos = token->ptr;
token->len = 0;
}
-
+
return token->len;
}
@@ -501,7 +294,7 @@
state->pos = token->ptr;
token->len = 0;
}
-
+
return token->len;
}
@@ -510,25 +303,11 @@
res = SCPI_LexCommonProgramHeader(state, token);
if(res > 0) return res;
-
+
res = SCPI_LexCompoundProgramHeader(state, token);
if(res > 0) return res;
-
+
return 0;
-}
-
-int SCPI_LexComma(lex_state_t * state, token_t * token) {
- token->ptr = state->pos;
-
- if (skipChr(state, ',')) {
- token->len = 1;
- token->type = TokComma;
- } else {
- token->len = 0;
- token->type = TokUnknown;
- }
-
- return token->len;
}
int SCPI_LexQuestion(lex_state_t * state, token_t * token) {
@@ -537,6 +316,196 @@
if (skipChr(state, '?')) {
token->len = 1;
token->type = TokQuiestion;
+ } else {
+ token->len = 0;
+ token->type = TokUnknown;
+ }
+
+ return token->len;
+}
+
+/* 7.7.1 <CHARACTER PROGRAM DATA> */
+int SCPI_LexCharacterProgramData(lex_state_t * state, token_t * token) {
+ token->ptr = state->pos;
+
+ if(!iseos(state) && isalpha(state->pos[0])) {
+ state->pos++;
+ while(!iseos(state) && (isalnum(state->pos[0]) || ischr(state, '_'))) {
+ state->pos++;
+ }
+ }
+
+ token->len = state->pos - token->ptr;
+ if(token->len > 0) {
+ token->type = TokProgramMnemonic;
+ } else {
+ token->type = TokUnknown;
+ }
+
+ return token->len;
+}
+
+/* 7.7.2 <DECIMAL NUMERIC PROGRAM DATA> */
+static int skipMantisa(lex_state_t * state) {
+ int someNumbers = 0;
+
+ skipPlusmn(state);
+
+ someNumbers += skipNumbers(state);
+
+ if(skipChr(state, '.')) {
+ someNumbers += skipNumbers(state);
+ }
+
+ return someNumbers > 0;
+}
+
+static int skipExponent(lex_state_t * state) {
+ int someNumbers = 0;
+
+ if(!iseos(state) && isE(state->pos[0])) {
+ state->pos++;
+
+ skipWs(state);
+
+ skipPlusmn(state);
+
+ someNumbers += skipNumbers(state);
+ }
+
+ return someNumbers > 0;
+}
+
+int SCPI_LexDecimalNumericProgramData(lex_state_t * state, token_t * token) {
+ const char * rollback;
+ token->ptr = state->pos;
+
+ if (skipMantisa(state)) {
+ rollback = state->pos;
+ skipWs(state);
+ if(!skipExponent(state)) {
+ state->pos = rollback;
+ }
+ }
+
+ token->len = state->pos - token->ptr;
+ if(token->len > 0) {
+ token->type = TokDecimalNumericProgramData;
+ } else {
+ token->type = TokUnknown;
+ }
+
+ return token->len;
+}
+
+/* 7.7.3 <SUFFIX PROGRAM DATA> */
+int SCPI_LexSuffixProgramData(lex_state_t * state, token_t * token) {
+ token->ptr = state->pos;
+
+ skipChr(state, '/');
+
+ // TODO: strict parsing : SLASH? (ALPHA+ (MINUS? DIGIT)?) ((SLASH | DOT) (ALPHA+ (MINUS? DIGIT)?))*
+ if (skipAlpha(state)) {
+ skipChr(state, '-');
+ skipDigit(state);
+
+ while (skipSlashDot(state)) {
+ skipAlpha(state);
+ skipChr(state, '-');
+ skipDigit(state);
+ }
+ }
+
+ token->len = state->pos - token->ptr;
+ if((token->len > 0)) {
+ token->type = TokSuffixProgramData;
+ } else {
+ token->type = TokUnknown;
+ state->pos = token->ptr;
+ token->len = 0;
+ }
+
+ return token->len;
+}
+
+/* 7.7.4 <NONDECIMAL NUMERIC PROGRAM DATA> */
+static int skipHexNum(lex_state_t * state) {
+ int someNumbers = 0;
+ while(!iseos(state) && isxdigit(state->pos[0])) {
+ state->pos++;
+ someNumbers++;
+ }
+ return someNumbers;
+}
+
+static int skipOctNum(lex_state_t * state) {
+ int someNumbers = 0;
+ while(!iseos(state) && isqdigit(state->pos[0])) {
+ state->pos++;
+ someNumbers++;
+ }
+ return someNumbers;
+}
+
+static int skipBinNum(lex_state_t * state) {
+ int someNumbers = 0;
+ while(!iseos(state) && isbdigit(state->pos[0])) {
+ state->pos++;
+ someNumbers++;
+ }
+ return someNumbers;
+}
+
+
+int SCPI_LexNondecimalNumericData(lex_state_t * state, token_t * token) {
+ token->ptr = state->pos;
+ int someNumbers = 0;
+ if(skipChr(state, '#')) {
+ if(!iseos(state)) {
+ if(isH(state->pos[0])) {
+ state->pos++;
+ someNumbers = skipHexNum(state);
+ token->type = TokHexnum;
+ } else if(isQ(state->pos[0])) {
+ state->pos++;
+ someNumbers = skipOctNum(state);
+ token->type = TokOctnum;
+ } else if(isB(state->pos[0])) {
+ state->pos++;
+ someNumbers = skipBinNum(state);
+ token->type = TokBinnum;
+ }
+ }
+ }
+
+ if (someNumbers) {
+ token->ptr += 2; // ignore number prefix
+ token->len = state->pos - token->ptr;
+ } else {
+ token->type = TokUnknown;
+ state->pos = token->ptr;
+ }
+ return token->len;
+}
+
+
+/* 7.7.5 <STRING PROGRAM DATA> */
+// TODO: int SCPI_LexStringProgramData(lex_state_t * state, token_t * token)
+// void SCPI_LexSingleQuoteProgramData(lex_state_t * state)
+// void SCPI_LexDoubleQuoteProgramDatalex_state_t * state)
+
+/* 7.7.6 <ARBITRARY BLOCK PROGRAM DATA> */
+// TODO: int SCPI_LexArbitraryBlockProgramData(lex_state_t * state, token_t * token)
+
+/* 7.7.7 <EXPRESSION PROGRAM DATA> */
+// TODO: int SCPI_LexProgramExpression(lex_state_t * state, token_t * token)
+
+int SCPI_LexComma(lex_state_t * state, token_t * token) {
+ token->ptr = state->pos;
+
+ if (skipChr(state, ',')) {
+ token->len = 1;
+ token->type = TokComma;
} else {
token->len = 0;
token->type = TokUnknown;
@@ -564,7 +533,7 @@
skipChr(state, '\r');
skipChr(state, '\n');
-
+
token->len = state->pos - token->ptr;
if((token->len > 0)) {
@@ -574,23 +543,9 @@
state->pos = token->ptr;
token->len = 0;
}
-
+
return token->len;
}
-
-/*
-
-int SCPI_LexProgramExpression(lex_state_t * state, token_t * token) {
- return 0;
-}
-
-void SCPI_LexSingleQuoteProgramData(lex_state_t * state) {
-}
-
-void SCPI_LexDoubleQuoteProgramDatalex_state_t * state) {
-}
-
-*/
const char * typeToStr(token_type_t type) {
switch(type) {
@@ -603,8 +558,6 @@
case TokBinnum: return "TokBinnum";
case TokProgramMnemonic: return "TokProgramMnemonic";
case TokDecimalNumericProgramData: return "TokDecimalNumericProgramData";
- case TokMantisa: return "TokMantisa";
- case TokExponent: return "TokExponent";
case TokSuffixProgramData: return "TokSuffixProgramData";
case TokSingleQuoteProgramData: return "TokSingleQuoteProgramData";
case TokDoubleQuoteProgramData: return "TokDoubleQuoteProgramData";
@@ -628,28 +581,27 @@
state.len = strlen((str)); \
} while(0)
-
int main(int argc, char ** argv) {
lex_state_t state;
token_t token;
-// INIT_STATE("MEAS:VOLT:DC? 1, 5\r\n");
+ // INIT_STATE("MEAS:VOLT:DC? 1, 5\r\n");
INIT_STATE(" \t MEAS:VOLT:DC? 1.58, .125, 5V\r\n");
SCPI_LexWhiteSpace(&state, &token); printToken(&token);
INIT_STATE("#H123fe5A , ");
SCPI_LexNondecimalNumericData(&state, &token); printToken(&token);
-
+
INIT_STATE("#B0111010101 , ");
SCPI_LexNondecimalNumericData(&state, &token); printToken(&token);
-
+
INIT_STATE("#Q125725433 , ");
SCPI_LexNondecimalNumericData(&state, &token); printToken(&token);
INIT_STATE("abc_213as564 , ");
- SCPI_LexProgramMnemonic(&state, &token); printToken(&token);
-
+ SCPI_LexCharacterProgramData(&state, &token); printToken(&token);
+
INIT_STATE("10 , ");
SCPI_LexDecimalNumericProgramData(&state, &token); printToken(&token);
@@ -658,16 +610,16 @@
INIT_STATE("+.5 , ");
SCPI_LexDecimalNumericProgramData(&state, &token); printToken(&token);
-
+
INIT_STATE("-. , ");
SCPI_LexDecimalNumericProgramData(&state, &token); printToken(&token);
INIT_STATE("-1 e , ");
SCPI_LexDecimalNumericProgramData(&state, &token); printToken(&token);
-
+
INIT_STATE("-1 e 3, ");
SCPI_LexDecimalNumericProgramData(&state, &token); printToken(&token);
-
+
INIT_STATE("1.5E12 , ");
SCPI_LexDecimalNumericProgramData(&state, &token); printToken(&token);
@@ -682,13 +634,13 @@
INIT_STATE("*?, ");
SCPI_LexCommonProgramHeader(&state, &token); printToken(&token);
-
+
INIT_STATE("MEAS:VOLT:DC?, ");
SCPI_LexCommonProgramHeader(&state, &token); printToken(&token);
-
+
INIT_STATE("MEAS:VOLT:DC?, ");
SCPI_LexCompoundProgramHeader(&state, &token); printToken(&token);
-
+
INIT_STATE(":MEAS:VOLT:DC?, ");
SCPI_LexCompoundProgramHeader(&state, &token); printToken(&token);
@@ -700,7 +652,7 @@
INIT_STATE("MEAS:VOLT:DC?, ");
SCPI_LexProgramHeader(&state, &token); printToken(&token);
-
+
INIT_STATE("*IDN?, ");
SCPI_LexProgramHeader(&state, &token); printToken(&token);
return 0;
--
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