1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146

//! Contains emitter configuration structure.

use std::io::Write;
use std::borrow::Cow;

use writer::EventWriter;

/// Emitter configuration structure.
///
/// This structure contains various options which control XML document emitter behavior.
#[derive(Clone, PartialEq, Eq, Debug)]
pub struct EmitterConfig {
    /// Line separator used to separate lines in formatted output. Default is `"\n"`.
    pub line_separator: Cow<'static, str>,

    /// A string which will be used for a single level of indentation. Default is `"  "`
    /// (two spaces).
    pub indent_string: Cow<'static, str>,

    /// Whether or not the emitted document should be indented. Default is false.
    ///
    /// The emitter is capable to perform automatic indentation of the emitted XML document.
    /// It is done in stream-like fashion and does not require the knowledge of the whole
    /// document in advance.
    ///
    /// Sometimes, however, automatic indentation is undesirable, e.g. when you want to keep
    /// existing layout when processing an existing XML document. Also the indentiation algorithm
    /// is not thoroughly tested. Hence by default it is disabled.
    pub perform_indent: bool,

    /// Whether or not characters in output events will be escaped. Default is true.
    ///
    /// The emitter can automatically escape characters which can't appear in PCDATA sections
    /// or element attributes of an XML document, like `<` or `"` (in attributes). This may
    /// introduce some overhead because then every corresponding piece of character data
    /// should be scanned for invalid characters.
    ///
    /// If this option is disabled, the XML writer may produce non-well-formed documents, so
    /// use `false` value for this option with care.
    pub perform_escaping: bool,

    /// Whether or not to write XML document declaration at the beginning of a document.
    /// Default is true.
    ///
    /// This option controls whether the document declaration should be emitted automatically
    /// before a root element is written if it was not emitted explicitly by the user.
    pub write_document_declaration: bool,

    /// Whether or not to convert elements with empty content to empty elements. Default is true.
    ///
    /// This option allows turning elements like `<a></a>` (an element with empty content)
    /// into `<a />` (an empty element).
    pub normalize_empty_elements: bool,

    /// Whether or not to emit CDATA events as plain characters. Default is false.
    ///
    /// This option forces the emitter to convert CDATA events into regular character events,
    /// performing all the necessary escaping beforehand. This may be occasionally useful
    /// for feeding the document into incorrect parsers which do not support CDATA.
    pub cdata_to_characters: bool,

    /// Whether or not to keep element names to support `EndElement` events without explicit names.
    /// Default is true.
    ///
    /// This option makes the emitter to keep names of written elements in order to allow
    /// omitting names when writing closing element tags. This could incur some memory overhead.
    pub keep_element_names_stack: bool,

    /// Whether or not to automatically insert leading and trailing spaces in emitted comments,
    /// if necessary. Default is true.
    ///
    /// This is a convenience option in order for the user not to append spaces before and after
    /// comments text in order to get more pretty comments: `<!-- something -->` instead of
    /// `<!--something-->`.
    pub autopad_comments: bool,
}

impl EmitterConfig {
    /// Creates an emitter configuration with default values.
    ///
    /// You can tweak default options with builder-like pattern:
    ///
    /// ```rust
    /// use xml::writer::EmitterConfig;
    ///
    /// let config = EmitterConfig::new()
    ///     .line_separator("\r\n")
    ///     .perform_indent(true)
    ///     .normalize_empty_elements(false);
    /// ```
    #[inline]
    pub fn new() -> EmitterConfig {
        EmitterConfig {
            line_separator: "\n".into(),
            indent_string: "  ".into(),  // two spaces
            perform_indent: false,
            perform_escaping: true,
            write_document_declaration: true,
            normalize_empty_elements: true,
            cdata_to_characters: false,
            keep_element_names_stack: true,
            autopad_comments: true
        }
    }

    /// Creates an XML writer with this configuration.
    ///
    /// This is a convenience method for configuring and creating a writer at the same time:
    ///
    /// ```rust
    /// use xml::writer::EmitterConfig;
    ///
    /// let mut target: Vec<u8> = Vec::new();
    ///
    /// let writer = EmitterConfig::new()
    ///     .line_separator("\r\n")
    ///     .perform_indent(true)
    ///     .normalize_empty_elements(false)
    ///     .create_writer(&mut target);
    /// ```
    ///
    /// This method is exactly equivalent to calling `EventWriter::new_with_config()` with
    /// this configuration object.
    #[inline]
    pub fn create_writer<W: Write>(self, sink: W) -> EventWriter<W> {
        EventWriter::new_with_config(sink, self)
    }
}

impl Default for EmitterConfig {
    #[inline]
    fn default() -> EmitterConfig {
        EmitterConfig::new()
    }
}

gen_setters!(EmitterConfig,
    line_separator: into Cow<'static, str>,
    indent_string: into Cow<'static, str>,
    perform_indent: val bool,
    write_document_declaration: val bool,
    normalize_empty_elements: val bool,
    cdata_to_characters: val bool,
    keep_element_names_stack: val bool,
    autopad_comments: val bool
);