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// © 2024 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
#include "unicode/utypes.h"
#ifndef U_HIDE_DEPRECATED_API
#ifndef MESSAGEFORMAT_PARSER_H
#define MESSAGEFORMAT_PARSER_H
#include "unicode/messageformat2_data_model.h"
#include "unicode/parseerr.h"
#include "messageformat2_allocation.h"
#include "messageformat2_errors.h"
#if U_SHOW_CPLUSPLUS_API
#if !UCONFIG_NO_FORMATTING
#if !UCONFIG_NO_MF2
U_NAMESPACE_BEGIN
namespace message2 {
using namespace data_model;
// Used for parameterizing options parsing code
// over the two builders that use it (Operator and Markup)
template <class T>
class OptionAdder {
private:
T& builder;
public:
OptionAdder(T& b) : builder(b) {}
void addOption(const UnicodeString& k, Operand&& r, UErrorCode& s) {
builder.addOption(k, std::move(r), s);
}
};
// Used for parameterizing attributes parsing code
// over the two builders that use it (Expression and Markup)
// Unfortunately the same OptionAdder class can't just be reused,
// becaues duplicate options are forbidden while duplicate attributes are not
template <class T>
class AttributeAdder {
private:
T& builder;
public:
AttributeAdder(T& b) : builder(b) {}
void addAttribute(const UnicodeString& k, Operand&& r, UErrorCode& s) {
builder.addAttribute(k, std::move(r), s);
}
};
// Parser class (private)
class Parser : public UMemory {
public:
virtual ~Parser();
private:
friend class MessageFormatter;
void parse(UParseError&, UErrorCode&);
/*
Use an internal "parse error" structure to make it easier to translate
absolute offsets to line offsets.
This is translated back to a `UParseError` at the end of parsing.
*/
typedef struct MessageParseError {
// The line on which the error occurred
uint32_t line;
// The offset, relative to the erroneous line, on which the error occurred
uint32_t offset;
// The total number of characters seen before advancing to the current line. It has a value of 0 if line == 0.
// It includes newline characters, because the index does too.
uint32_t lengthBeforeCurrentLine;
// This parser doesn't yet use the last two fields.
UChar preContext[U_PARSE_CONTEXT_LEN];
UChar postContext[U_PARSE_CONTEXT_LEN];
} MessageParseError;
Parser(const UnicodeString &input, MFDataModel::Builder& dataModelBuilder, StaticErrors& e, UnicodeString& normalizedInputRef)
: source(input), index(0), errors(e), normalizedInput(normalizedInputRef), dataModel(dataModelBuilder) {
parseError.line = 0;
parseError.offset = 0;
parseError.lengthBeforeCurrentLine = 0;
parseError.preContext[0] = '\0';
parseError.postContext[0] = '\0';
}
static void translateParseError(const MessageParseError&, UParseError&);
static void setParseError(MessageParseError&, uint32_t);
void maybeAdvanceLine();
Pattern parseSimpleMessage(UErrorCode&);
void parseBody(UErrorCode&);
void parseDeclarations(UErrorCode&);
void parseUnsupportedStatement(UErrorCode&);
void parseLocalDeclaration(UErrorCode&);
void parseInputDeclaration(UErrorCode&);
void parseSelectors(UErrorCode&);
void parseWhitespaceMaybeRequired(bool, UErrorCode&);
void parseRequiredWhitespace(UErrorCode&);
void parseOptionalWhitespace(UErrorCode&);
void parseToken(UChar32, UErrorCode&);
void parseTokenWithWhitespace(UChar32, UErrorCode&);
void parseToken(const std::u16string_view&, UErrorCode&);
void parseTokenWithWhitespace(const std::u16string_view&, UErrorCode&);
bool nextIs(const std::u16string_view&) const;
UnicodeString parseName(UErrorCode&);
UnicodeString parseIdentifier(UErrorCode&);
UnicodeString parseDigits(UErrorCode&);
VariableName parseVariableName(UErrorCode&);
FunctionName parseFunction(UErrorCode&);
UnicodeString parseEscapeSequence(UErrorCode&);
Literal parseUnquotedLiteral(UErrorCode&);
Literal parseQuotedLiteral(UErrorCode&);
Literal parseLiteral(UErrorCode&);
template<class T>
void parseAttribute(AttributeAdder<T>&, UErrorCode&);
template<class T>
void parseAttributes(AttributeAdder<T>&, UErrorCode&);
template<class T>
void parseOption(OptionAdder<T>&, UErrorCode&);
template<class T>
void parseOptions(OptionAdder<T>&, UErrorCode&);
Operator parseAnnotation(UErrorCode&);
void parseLiteralOrVariableWithAnnotation(bool, Expression::Builder&, UErrorCode&);
Markup parseMarkup(UErrorCode&);
Expression parseExpression(UErrorCode&);
std::variant<Expression, Markup> parsePlaceholder(UErrorCode&);
UnicodeString parseTextChar(UErrorCode&);
Key parseKey(UErrorCode&);
SelectorKeys parseNonEmptyKeys(UErrorCode&);
void errorPattern(UErrorCode& status);
Pattern parseQuotedPattern(UErrorCode&);
bool isDeclarationStart();
UChar32 peek() const { return source.char32At(index) ; }
UChar32 peek(uint32_t i) const {
return source.char32At(source.moveIndex32(index, i));
}
void next() { index = source.moveIndex32(index, 1); }
bool inBounds() const { return (int32_t) index < source.length(); }
bool inBounds(uint32_t i) const { return source.moveIndex32(index, i) < source.length(); }
bool allConsumed() const { return (int32_t) index == source.length(); }
// The input string
const UnicodeString &source;
// The current position within the input string -- counting in UChar32
uint32_t index;
// Represents the current line (and when an error is indicated),
// character offset within the line of the parse error
MessageParseError parseError;
// The structure to use for recording errors
StaticErrors& errors;
// Normalized version of the input string (optional whitespace removed)
UnicodeString& normalizedInput;
// The parent builder
MFDataModel::Builder &dataModel;
}; // class Parser
} // namespace message2
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_MF2 */
#endif /* #if !UCONFIG_NO_FORMATTING */
#endif /* U_SHOW_CPLUSPLUS_API */
#endif // MESSAGEFORMAT_PARSER_H
#endif // U_HIDE_DEPRECATED_API
// eof
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