org.jruby.lexer.yacc.StringTerm Maven / Gradle / Ivy
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* Version: EPL 2.0/GPL 2.0/LGPL 2.1
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*
* Software distributed under the License is distributed on an "AS
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* Copyright (C) 2015 The JRuby Team ([email protected])
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package org.jruby.lexer.yacc;
import java.io.IOException;
import org.jcodings.Encoding;
import org.jruby.ast.RegexpNode;
import org.jruby.lexer.yacc.SyntaxException.PID;
import org.jruby.parser.RubyParser;
import org.jruby.util.ByteList;
import org.jruby.util.RegexpOptions;
import static org.jruby.lexer.LexingCommon.*;
public class StringTerm extends StrTerm {
// Expand variables, Indentation of final marker
private int flags;
// Start of string ([, (, {, <, ', ", \n)
private final char begin;
// End of string (], ), }, >, ', ", \0)
private final char end;
// Syntax errors (eof) will occur at this position.
private final int startLine;
// How many strings are nested in the current string term
private int nest;
public StringTerm(int flags, int begin, int end, int startLine) {
this.flags = flags;
this.begin = (char) begin;
this.end = (char) end;
this.nest = 0;
this.startLine = startLine;
}
public int getFlags() {
return flags;
}
protected ByteList createByteList(RubyLexer lexer) {
ByteList bytelist = new ByteList(15);
bytelist.setEncoding(lexer.getEncoding());
return bytelist;
}
private int endFound(RubyLexer lexer) throws IOException {
if ((flags & STR_FUNC_QWORDS) != 0) {
flags |= STR_FUNC_TERM;
lexer.pushback(0);
lexer.getPosition();
return ' ';
}
lexer.setStrTerm(null);
if ((flags & STR_FUNC_REGEXP) != 0) {
RegexpOptions options = lexer.parseRegexpFlags();
ByteList regexpBytelist = ByteList.create("");
lexer.setState(EXPR_END | EXPR_ENDARG);
lexer.setValue(new RegexpNode(lexer.getPosition(), regexpBytelist, options));
return RubyParser.tREGEXP_END;
}
if ((flags & STR_FUNC_LABEL) != 0 && lexer.isLabelSuffix()) {
lexer.nextc();
lexer.setState(EXPR_BEG | EXPR_LABEL);
return RubyParser.tLABEL_END;
}
lexer.setState(EXPR_END | EXPR_ENDARG);
lexer.setValue("" + end);
return RubyParser.tSTRING_END;
}
public int parseString(RubyLexer lexer) throws IOException {
boolean spaceSeen = false;
int c;
if ((flags & STR_FUNC_TERM) != 0) {
if ((flags & STR_FUNC_QWORDS) != 0) lexer.nextc(); // delayed terminator char
lexer.setState(EXPR_END|EXPR_ENDARG);
lexer.setValue("" + end);
lexer.setStrTerm(null);
return ((flags & STR_FUNC_REGEXP) != 0) ? RubyParser.tREGEXP_END : RubyParser.tSTRING_END;
}
c = lexer.nextc();
if ((flags & STR_FUNC_QWORDS) != 0 && Character.isWhitespace(c)) {
do { c = lexer.nextc(); } while (Character.isWhitespace(c));
spaceSeen = true;
}
if ((flags & STR_FUNC_LIST) != 0) {
flags &= ~STR_FUNC_LIST;
spaceSeen = true;
}
if (c == end && nest == 0) return endFound(lexer);
if (spaceSeen) {
lexer.pushback(c);
lexer.getPosition();
return ' ';
}
ByteList buffer = createByteList(lexer);
lexer.newtok(true);
if ((flags & STR_FUNC_EXPAND) != 0 && c == '#') {
int token = lexer.peekVariableName(RubyParser.tSTRING_DVAR, RubyParser.tSTRING_DBEG);
if (token != 0) return token;
buffer.append('#'); // not an expansion to variable so it is just a literal.
}
lexer.pushback(c); // pushback API is deceptive here...we are just pushing index back one and not pushing c back necessarily.
Encoding enc[] = new Encoding[1];
enc[0] = lexer.getEncoding();
if (parseStringIntoBuffer(lexer, buffer, enc) == EOF) {
lexer.setRubySourceline(startLine);
lexer.compile_error("unterminated " + ((flags & STR_FUNC_REGEXP) != 0 ? "regexp" : "string") + " meets end of file");
}
lexer.setValue(lexer.createStr(buffer, flags));
return RubyParser.tSTRING_CONTENT;
}
private void mixedEscape(RubyLexer lexer, Encoding foundEncoding, Encoding parserEncoding) {
lexer.compile_error(PID.MIXED_ENCODING, "" + foundEncoding + " mixed within " + parserEncoding);
}
// mri: parser_tokadd_string
public int parseStringIntoBuffer(RubyLexer lexer, ByteList buffer, Encoding enc[]) throws IOException {
boolean qwords = (flags & STR_FUNC_QWORDS) != 0;
boolean expand = (flags & STR_FUNC_EXPAND) != 0;
boolean escape = (flags & STR_FUNC_ESCAPE) != 0;
boolean regexp = (flags & STR_FUNC_REGEXP) != 0;
boolean symbol = (flags & STR_FUNC_SYMBOL) != 0;
boolean hasNonAscii = false;
int c;
while ((c = lexer.nextc()) != EOF) {
if (lexer.getHeredocIndent() > 0) {
lexer.update_heredoc_indent(c);
}
if (begin != '\0' && c == begin) {
nest++;
} else if (c == end) {
if (nest == 0) {
lexer.pushback(c);
break;
}
nest--;
} else if (expand && c == '#' && !lexer.peek('\n')) {
int c2 = lexer.nextc();
if (c2 == '$' || c2 == '@' || c2 == '{') {
lexer.pushback(c2);
lexer.pushback(c);
break;
}
lexer.pushback(c2);
} else if (c == '\\') {
c = lexer.nextc();
switch (c) {
case '\n':
if (qwords) break;
if (expand) continue;
buffer.append('\\');
break;
case '\\':
if (escape) buffer.append(c);
break;
case 'u':
if (!expand) {
buffer.append('\\');
break;
}
if (regexp) {
lexer.readUTFEscapeRegexpLiteral(buffer);
} else {
lexer.readUTFEscape(buffer, true, symbol);
}
if (hasNonAscii && buffer.getEncoding() != enc[0]) {
mixedEscape(lexer, buffer.getEncoding(), enc[0]);
}
continue;
default:
if (c == EOF) return EOF;
if (!lexer.isASCII(c)) {
if (!expand) buffer.append('\\');
// goto non_ascii
hasNonAscii = true;
if (buffer.getEncoding() != enc[0]) {
mixedEscape(lexer, buffer.getEncoding(), enc[0]);
continue;
}
if (!lexer.tokadd_mbchar(c, buffer)) {
lexer.compile_error(PID.INVALID_MULTIBYTE_CHAR, "invalid multibyte char (" + enc[0] + ")");
}
continue;
// end of goto non_ascii
}
if (regexp) {
if (c == end && !simple_re_meta(c)) {
buffer.append(c);
continue;
}
lexer.pushback(c);
parseEscapeIntoBuffer(lexer, buffer);
if (hasNonAscii && buffer.getEncoding() != enc[0]) {
mixedEscape(lexer, buffer.getEncoding(), enc[0]);
}
continue;
} else if (expand) {
lexer.pushback(c);
if (escape) buffer.append('\\');
c = lexer.readEscape();
} else if (qwords && Character.isWhitespace(c)) {
/* ignore backslashed spaces in %w */
} else if (c != end && !(begin != '\0' && c == begin)) {
buffer.append('\\');
lexer.pushback(c);;
continue;
}
}
} else if (!lexer.isASCII(c)) {
nonascii: hasNonAscii = true; // Label for comparison with MRI only.
if (buffer.getEncoding() != enc[0]) {
mixedEscape(lexer, buffer.getEncoding(), enc[0]);
continue;
}
if (!lexer.tokadd_mbchar(c, buffer)) {
lexer.compile_error(PID.INVALID_MULTIBYTE_CHAR, "invalid multibyte char (" + enc[0] + ")");
}
continue;
// end of goto non_ascii
} else if (qwords && Character.isWhitespace(c)) {
lexer.pushback(c);
break;
}
if ((c & 0x80) != 0) {
hasNonAscii = true;
if (buffer.getEncoding() != enc[0]) {
mixedEscape(lexer, buffer.getEncoding(), enc[0]);
continue;
}
}
buffer.append(c);
}
enc[0] = buffer.getEncoding();
return c;
}
private boolean simple_re_meta(int c) {
switch(c) {
case '$': case '*': case '+': case '.': case '?': case '^': case '|': case ')': case ']': case '}': case '>':
return true;
}
return false;
}
// Was a goto in original ruby lexer
private void escaped(RubyLexer lexer, ByteList buffer) throws java.io.IOException {
int c;
switch (c = lexer.nextc()) {
case '\\':
parseEscapeIntoBuffer(lexer, buffer);
break;
case EOF:
lexer.compile_error("Invalid escape character syntax");
default:
buffer.append(c);
}
}
private void parseEscapeIntoBuffer(RubyLexer lexer, ByteList buffer) throws java.io.IOException {
int c;
switch (c = lexer.nextc()) {
case '\n':
break; /* just ignore */
case '0':
case '1':
case '2':
case '3': /* octal constant */
case '4':
case '5':
case '6':
case '7':
buffer.append('\\');
buffer.append(c);
for (int i = 0; i < 2; i++) {
c = lexer.nextc();
if (c == EOF) {
lexer.compile_error("Invalid escape character syntax");
}
if (!isOctChar(c)) {
lexer.pushback(c);
break;
}
buffer.append(c);
}
break;
case 'x': /* hex constant */
buffer.append('\\');
buffer.append(c);
c = lexer.nextc();
if (!isHexChar(c)) {
lexer.compile_error("Invalid escape character syntax");
}
buffer.append(c);
c = lexer.nextc();
if (isHexChar(c)) {
buffer.append(c);
} else {
lexer.pushback(c);
}
break;
case 'M':
if ((lexer.nextc()) != '-') {
lexer.compile_error("Invalid escape character syntax");
}
buffer.append(new byte[] { '\\', 'M', '-' });
escaped(lexer, buffer);
break;
case 'C':
if ((lexer.nextc()) != '-') {
lexer.compile_error("Invalid escape character syntax");
}
buffer.append(new byte[] { '\\', 'C', '-' });
escaped(lexer, buffer);
break;
case 'c':
buffer.append(new byte[] { '\\', 'c' });
escaped(lexer, buffer);
break;
case EOF:
lexer.compile_error("Invalid escape character syntax");
default:
if (c != '\\' || c != end) buffer.append('\\');
buffer.append(c);
}
}
}
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