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Name

Description

The model uses the attributes in the following table to describe properties of the syntax. Unless otherwise qualified, these syntax attributes have attribute identifiers that use the FN_ID_STRING format. A context that supports the XFN standard syntax model has an attribute set containing the fn_syntax_type (with identifier format FN_ID_STRING ) attribute with the value "standard" (ASCII attribute syntax).

These are the interfaces:

#include <xfn/xfn.h>

FN_attrset_t *fn_ctx_get_syntax_attrs(FN_ctx_t *ctx, const FN_composite_name_t *name, FN_status_t *status);

FN_compound_name_t *fn_compound_name_from_syntax_attrs( const FN_attrset_t *aset, const FN_string_t *name, FN_status_t *status);

fn_syntax_type

Its value is the ASCII string "standard" if the context supports the XFN standard syntax model. Its value is an implementation-specific value if another syntax model is supported.

fn_std_syntax_direction

Its value is an ASCII string, one of "left_to_right", "right_to_left", or "flat". This determines whether the order of components in a compound name string goes from left to right, right to left, or whether the namespace is flat (in other words, not hierarchical; em all names are atomic).

fn_std_syntax_separator

Its value is the separator string for this name syntax. This attribute is required unless the fn_std_syntax_direction is "flat".

fn_std_syntax_escape

If present, its value is the escape string for this name syntax.

fn_std_syntax_case_insensitive

If this attribute is present, it indicates that names that differ only in case are considered identical. If this attribute is absent, it indicates that case is significant. If a value is present, it is ignored.

fn_std_syntax_begin_quote

If present, its value is the begin-quote string for this syntax. There can be multiple values for this attribute.

fn_std_syntax_end_quote

If present, its value is the end-quote string for this syntax. There can be multiple values for this attribute.

fn_std_syntax_ava_separator

If present, its value is the attribute value assertion separator string for this syntax.

fn_std_syntax_typeval_separator

If present, its value is the attribute type-value separator string for this syntax.

fn_std_syntax_code_sets

If present, its value identifies the code sets of the string representation for this syntax. Its value consists of a structure containing an array of code sets supported by the context; the first member of the array is the preferred code set of the context. The values for the code sets are defined in the X/Open code set registry. If this attribute is not present, or if the value is empty, the default code set is ISO 646 (same encoding as ASCII).

fn_std_syntax_locale_info

If present, identifies locale information, such as character set information, of the string representation for this syntax. The interpretation of its value is implementation-dependent.

The XFN standard syntax attributes are interpreted according to the following rules:

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1. In a string without quotes or escapes, any instance of the separator string delimits two atomic names.
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2. A separator, quotation or escape string is escaped if preceded immediately (on the left) by the escape string.
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3. A non-escaped begin-quote which precedes a component must be matched by a non-escaped end-quote at the end of the component. Quotes embedded in non-quoted names are treated as simple characters and do not need to be matched. An unmatched quotation fails with the status code FN_E_ILLEGAL_NAME.
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4. If there are multiple values for begin-quote and end-quote, a specific begin-quote value must be matched with its corresponding end-quote value.
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5. When the separator appears between a (non-escaped) begin quote and the end quote, it is ignored.
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6. When the separator is escaped, it is ignored. An escaped begin-quote or end-quote string is not treated as a quotation mark. An escaped escape string is not treated as an escape string.
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7. A non-escaped escape string appearing within quotes is interpreted as an escape string. This can be used to embed an end-quote within a quoted string.

After constructing a compound name from a string, the resulting component atoms have one level of escape strings and quotations interpreted and consumed.

fn_ctx_get_syntax_attrs() is used to obtain the syntax attributes associated with a context.

fn_compound_name_from_syntax() is used to construct a compound name object using the string form of the name and the syntax attributes of the name.

Errors

FN_E_ILLEGAL_NAME

The name supplied to the operation was not a well-formed component according to the name syntax of the context.

FN_E_INCOMPATIBLE_CODE_SETS

Code set mismatches that occur during the construction of the compound name’s string form are resolved in an implementation-dependent way. When an implementation discovers that a compound name has components with incompatible code sets, it returns this error code.

FN_E_INVALID_SYNTAX_ATTRS

The syntax attributes supplied are invalid or insufficient to fully specify the syntax.

FN_E_SYNTAX_NOT_SUPPORTED

The syntax specified is not supported.

Usage

See Also

Notes

Table of Contents

• Name
• Description
• Errors
• Usage
• See Also
• Notes