javacc-7.0.3.bin.templates.cpp.ParseException.cc.template Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of javacc Show documentation
Show all versions of javacc Show documentation
JavaCC is a parser/scanner generator for Java.
\#include "ParseException.h"
#if NAMESPACE
namespace ${NAMESPACE_OPEN}
#fi
/**
* This exception is thrown when parse errors are encountered.
* You can explicitly create objects of this exception type by
* calling the method generate_ParseException in the generated
* parser.
*
* You can modify this class to customize your error reporting
* mechanisms so long as you retain the fields.
*/
/**
* This constructor is used by the method "generate_ParseException"
* in the generated parser. Calling this constructor generates
* a new object of this type with the fields "currentToken",
* "expectedTokenSequences", and "tokenImage" set.
*/
ParseException::ParseException(Token currentTokenVal,
int** expectedTokenSequencesVal,
JJString* tokenImageVal
)
{
initialise(currentTokenVal, expectedTokenSequencesVal, tokenImageVal);
currentToken = currentTokenVal;
expectedTokenSequences = expectedTokenSequencesVal;
tokenImage = tokenImageVal;
}
/**
* The following constructors are for use by you for whatever
* purpose you can think of. Constructing the exception in this
* manner makes the exception behave in the normal way - i.e., as
* documented in the class "Throwable". The fields "errorToken",
* "expectedTokenSequences", and "tokenImage" do not contain
* relevant information. The JavaCC generated code does not use
* these constructors.
*/
ParseException::ParseException() {
}
/** Constructor with message. */
ParseException::ParseException(const JJString& message) {
}
/**
* This is the last token that has been consumed successfully. If
* this object has been created due to a parse error, the token
* followng this token will (therefore) be the first error token.
*/
Token currentToken;
/**
* Each entry in this array is an array of integers. Each array
* of integers represents a sequence of tokens (by their ordinal
* values) that is expected at this point of the parse.
*/
int** expectedTokenSequences;
/**
* This is a reference to the "tokenImage" array of the generated
* parser within which the parse error occurred. This array is
* defined in the generated ...Constants class.
*/
JJString* tokenImage;
/**
* It uses "currentToken" and "expectedTokenSequences" to generate a parse
* error message and returns it. If this object has been created
* due to a parse error, and you do not catch it (it gets thrown
* from the parser) the correct error message
* gets displayed.
*/
JJString ParseException::initialise(Token currentToken,
int** expectedTokenSequences,
JJString* tokenImage) {
\#if 0
//JJString eol = System.getProperty("line.separator", "\n");
expected = new JJString();
int maxSize = 0;
for (int i = 0; i < expectedTokenSequences.length; i++) {
if (maxSize < expectedTokenSequences[i].length) {
maxSize = expectedTokenSequences[i].length;
}
for (int j = 0; j < expectedTokenSequences[i].length; j++) {
expected.append(tokenImage[expectedTokenSequences[i][j]]).append(' ');
}
if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
expected.append((JJChar*)"...");
}
expected.append(eol).append(" ");
}
JJString retval = (JJChar*)"Encountered \"";
Token tok = currentToken.next;
for (int i = 0; i < maxSize; i++) {
if (i != 0) retval += (JJChar*)" ";
if (tok.kind == 0) {
retval += tokenImage[0];
break;
}
retval += (JJChar*)" " + tokenImage[tok.kind];
retval += (JJChar*)" \"";
retval += add_escapes(tok.image);
retval += (JJChar*)" \"";
tok = tok.next;
}
retval += (JJChar*)"\" at line " + currentToken.next.beginLine + (JJChar*)", column " + currentToken.next.beginColumn;
retval += (JJChar*)"." + eol;
if (expectedTokenSequences.length == 1) {
retval += (JJChar*)"Was expecting:" + eol + (JJChar*)" ";
} else {
retval += (JJChar*)"Was expecting one of:" + eol + (JJChar*)" ";
}
retval += expected.toString();
return retval;
\#endif
return (JJChar*)"Parse exception";
}
/**
* The end of line JJString for this machine.
*/
\#define eol "\n"
/**
* Used to convert raw characters to their escaped version
* when these raw version cannot be used as part of an ASCII
* string literal.
*/
JJString ParseException::add_escapes(const JJString& str) {
/*
JJString *retval = new JJString();
JJChar ch;
for (int i = 0; i < str.length(); i++) {
switch (str.charAt(i))
{
case '\b':
retval.append("\\b");
continue;
case '\t':
retval.append("\\t");
continue;
case '\n':
retval.append("\\n");
continue;
case '\f':
retval.append("\\f");
continue;
case '\r':
retval.append("\\r");
continue;
case '\"':
retval.append("\\\"");
continue;
case '\'':
retval.append("\\\'");
continue;
case '\\':
retval.append("\\\\");
continue;
default:
if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
JJString s = "0000" + Integer.toString(ch, 16);
retval.append("\\u" + s.substring(s.length() - 4, s.length()));
} else {
retval.append(ch);
}
continue;
}
}
return retval.toString();
*/ return str;
}
#if NAMESPACE
${NAMESPACE_CLOSE}
#fi