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@ -2,12 +2,43 @@ |
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# pylint: disable=too-few-public-methods |
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import functools |
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import logging |
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import os |
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LOGGER = logging.getLogger() |
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class OrderedLifoDict: |
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"""Ordered (LIFO) dictionary. |
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Mimics the :class:`dict` dictionary, with: |
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- dictionary is ordered: the order the keys are kept (as with |
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:class:`collections.OrderedDict`), excepted that: |
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- LIFO: the last item is reterned first when iterating. |
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""" |
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def __init__(self, default=None): |
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if default is None: |
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self._keys = [] |
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self._values = {} |
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else: |
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self._keys = list(default.keys()) |
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self._values = default.copy() |
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def values(self): |
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"""Same as :meth:`dict.values`.""" |
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for key in self: |
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yield self._values[key] |
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def __iter__(self): |
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yield from self._keys |
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def __setitem__(self, key, value): |
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if key not in self._keys: |
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self._keys.insert(0, key) |
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self._values[key] = value |
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def __getitem__(self, key): |
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return self._values[key] |
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def _indent(string): |
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"""Return and indented version of argument.""" |
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return "\n".join([" {}".format(line) for line in string.split('\n')]) |
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@ -21,15 +52,6 @@ INLINE_PROPERTIES = { |
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"image", |
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} |
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#: List of properties that are listed in the `\beginsong` LaTeX directive. |
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BEGINSONG_PROPERTIES = { |
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"album", |
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"copyright", |
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"cov", |
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"vcov", |
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"tag", |
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} |
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#: Some directive have alternative names. For instance `{title: Foo}` and `{t: |
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#: Foo}` are equivalent. |
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DIRECTIVE_SHORTCUTS = { |
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@ -40,7 +62,6 @@ DIRECTIVE_SHORTCUTS = { |
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"c": "comment", |
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"gc": "guitar_comment", |
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"cover": "cov", |
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"vcover": "vcov", |
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} |
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def directive_name(text): |
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@ -53,14 +74,17 @@ class AST: |
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_template = None |
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inline = False |
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def template(self, extension): |
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def template(self): |
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"""Return the template to be used to render this object.""" |
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if self._template is None: |
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LOGGER.warning("No template defined for {}.".format(self.__class__)) |
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base = "error" |
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else: |
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base = self._template |
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return "content_{}.{}".format(base, extension) |
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return "content_{}".format(base) |
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class Error(AST): |
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"""Parsing error. To be ignored.""" |
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class Line(AST): |
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"""A line is a sequence of (possibly truncated) words, spaces and chords.""" |
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@ -76,9 +100,6 @@ class Line(AST): |
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self.line.insert(0, data) |
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return self |
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def __str__(self): |
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return "".join([str(item) for item in self.line]) |
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def strip(self): |
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"""Remove spaces at the beginning and end of line.""" |
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while True: |
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@ -94,6 +115,7 @@ class Line(AST): |
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class LineElement(AST): |
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"""Something present on a line.""" |
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# pylint: disable=abstract-method |
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pass |
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class Word(LineElement): |
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@ -104,9 +126,6 @@ class Word(LineElement): |
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super().__init__() |
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self.value = value |
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def __str__(self): |
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return self.value |
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class Space(LineElement): |
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"""A space between words""" |
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_template = "space" |
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@ -114,20 +133,21 @@ class Space(LineElement): |
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def __init__(self): |
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super().__init__() |
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def __str__(self): |
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return " " |
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class ChordList(LineElement): |
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"""A list of chords.""" |
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_template = "chordlist" |
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def __init__(self, *chords): |
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self.chords = chords |
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class Chord(LineElement): |
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class Chord(AST): |
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"""A chord.""" |
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_template = "chord" |
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def __init__(self, value): |
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super().__init__() |
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self.value = value |
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def __str__(self): |
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return "[{}]".format(self.value) |
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def __init__(self, chord): |
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# pylint: disable=too-many-arguments |
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self.chord = chord |
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class Verse(AST): |
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"""A verse (or bridge, or chorus)""" |
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@ -144,12 +164,6 @@ class Verse(AST): |
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self.lines.insert(0, data) |
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return self |
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def __str__(self): |
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return '{{start_of_{type}}}\n{content}\n{{end_of_{type}}}'.format( |
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type=self.type, |
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content=_indent("\n".join([str(line) for line in self.lines])), |
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) |
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class Chorus(Verse): |
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"""Chorus""" |
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type = 'chorus' |
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@ -167,30 +181,23 @@ class Song(AST): |
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- titles: The list of titles |
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- language: The language (if set), None otherwise |
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- authors: The list of authors |
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- meta_beginsong: The list of directives that are to be set in the |
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`\beginsong{}` LaTeX directive. |
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- meta: Every other metadata. |
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""" |
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#: Some directives are added to the song using special methods. |
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METADATA_TYPE = { |
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METADATA_ADD = { |
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"title": "add_title", |
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"subtitle": "add_subtitle", |
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"artist": "add_author", |
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"key": "add_key", |
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} |
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#: Some directives have to be processed before being considered. |
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PROCESS_DIRECTIVE = { |
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"cov": "_process_relative", |
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"partition": "_process_relative", |
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"image": "_process_relative", |
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"define": "add_cumulative", |
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"language": "add_cumulative", |
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} |
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def __init__(self, filename): |
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super().__init__() |
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self.content = [] |
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self.meta = [] |
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self.meta = OrderedLifoDict() |
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self._authors = [] |
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self._titles = [] |
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self._subtitles = [] |
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@ -199,13 +206,9 @@ class Song(AST): |
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def add(self, data): |
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"""Add an element to the song""" |
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if isinstance(data, Directive): |
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# Some directives are preprocessed |
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name = directive_name(data.keyword) |
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if name in self.PROCESS_DIRECTIVE: |
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data = getattr(self, self.PROCESS_DIRECTIVE[name])(data) |
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if data is None: |
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if isinstance(data, Error): |
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return self |
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elif data is None: |
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# New line |
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if not (self.content and isinstance(self.content[0], Newline)): |
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self.content.insert(0, Newline()) |
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@ -219,127 +222,78 @@ class Song(AST): |
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self.content.insert(0, data) |
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elif isinstance(data, Directive): |
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# Add a metadata directive. Some of them are added using special |
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# methods listed in ``METADATA_TYPE``. |
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name = directive_name(data.keyword) |
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if name in self.METADATA_TYPE: |
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getattr(self, self.METADATA_TYPE[name])(*data.as_tuple) |
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# methods listed in ``METADATA_ADD``. |
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if data.keyword in self.METADATA_ADD: |
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getattr(self, self.METADATA_ADD[data.keyword])(data) |
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else: |
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self.meta.append(data) |
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self.meta[data.keyword] = data |
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else: |
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raise Exception() |
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return self |
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def str_meta(self): |
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"""Return an iterator over *all* metadata, as strings.""" |
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for title in self.titles: |
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yield "{{title: {}}}".format(title) |
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for author in self.authors: |
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yield "{{by: {}}}".format(author) |
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for key in sorted(self.keys): |
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yield "{{key: {}}}".format(str(key)) |
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for key in sorted(self.meta): |
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yield str(key) |
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def add_title(self, data): |
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"""Add a title""" |
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self._titles.insert(0, data.argument) |
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def add_cumulative(self, data): |
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"""Add a cumulative argument into metadata""" |
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if data.keyword not in self.meta: |
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self.meta[data.keyword] = [] |
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self.meta[data.keyword].insert(0, data) |
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def __str__(self): |
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return ( |
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"\n".join(self.str_meta()).strip() |
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+ |
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"\n========\n" |
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+ |
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"\n".join([str(item) for item in self.content]).strip() |
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) |
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def get_data_argument(self, keyword, default): |
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"""Return `self.meta[keyword].argument`. |
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Return `default` if `self.meta[keyword]` does not exist. |
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def add_title(self, __ignored, title): |
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"""Add a title""" |
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self._titles.insert(0, title) |
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If `self.meta[keyword]` is a list, return the list of `item.argument` |
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for each item in the list. |
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""" |
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if keyword not in self.meta: |
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return default |
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if isinstance(self.meta[keyword], list): |
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return [item.argument for item in self.meta[keyword]] |
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else: |
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return self.meta[keyword].argument |
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def add_subtitle(self, __ignored, title): |
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def add_subtitle(self, data): |
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"""Add a subtitle""" |
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self._subtitles.insert(0, title) |
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self._subtitles.insert(0, data.argument) |
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@property |
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def titles(self): |
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"""Return the list of titles (and subtitles).""" |
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return self._titles + self._subtitles |
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def add_author(self, __ignored, title): |
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def add_author(self, data): |
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"""Add an auhor.""" |
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self._authors.insert(0, title) |
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self._authors.insert(0, data.argument) |
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@property |
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def authors(self): |
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"""Return the list of (raw) authors.""" |
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return self._authors |
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def get_directive(self, key, default=None): |
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"""Return the first directive with a given key.""" |
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for directive in self.meta: |
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if directive.keyword == directive_name(key): |
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return directive.argument |
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return default |
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def get_directives(self, key): |
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"""Return the list of directives with a given key.""" |
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values = [] |
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for directive in self.meta: |
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if directive.keyword == directive_name(key): |
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values.append(directive.argument) |
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return values |
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def add_key(self, __ignored, argument): |
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def add_key(self, data): |
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"""Add a new {key: foo: bar} directive.""" |
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key, *argument = argument.split(":") |
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self._keys.append(Directive( |
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key, *argument = data.argument.split(":") |
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if 'keys' not in self.meta: |
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self.meta['keys'] = [] |
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self.meta['keys'].insert(0, Directive( |
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key.strip(), |
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":".join(argument).strip(), |
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)) |
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@property |
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def keys(self): |
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"""Return the list of keys. |
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That is, directive that where given of the form ``{key: foo: bar}``. |
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""" |
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return self._keys |
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def meta_beginsong(self): |
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r"""Return the meta information to be put in \beginsong.""" |
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for directive in BEGINSONG_PROPERTIES: |
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if self.get_directive(directive) is not None: |
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yield (directive, self.get_directive(directive)) |
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for (key, value) in self.keys: |
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yield (key, value) |
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def _process_relative(self, directive): |
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"""Return the directive, in which the argument is given relative to file |
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This argument is expected to be a path (as a string). |
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""" |
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return Directive( |
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directive.keyword, |
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os.path.join( |
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os.path.dirname(self.filename), |
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directive.argument, |
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), |
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) |
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class Newline(AST): |
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"""New line""" |
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_template = "newline" |
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def __str__(self): |
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return "" |
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@functools.total_ordering |
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class Directive(AST): |
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"""A directive""" |
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def __init__(self, keyword="", argument=None): |
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def __init__(self, keyword, argument=None): |
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super().__init__() |
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self._keyword = None |
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self.keyword = keyword |
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self.keyword = directive_name(keyword.strip()) |
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self.argument = argument |
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@property |
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@ -350,49 +304,47 @@ class Directive(AST): |
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""" |
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return self.keyword |
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@property |
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def keyword(self): |
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"""Keyword of the directive.""" |
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return self._keyword |
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@property |
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def inline(self): |
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"""True iff this directive is to be rendered in the flow on the song. |
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""" |
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return self.keyword in INLINE_PROPERTIES |
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@keyword.setter |
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def keyword(self, value): |
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"""self.keyword setter |
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Replace keyword by its canonical name if it is a shortcut. |
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""" |
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self._keyword = directive_name(value.strip()) |
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def __str__(self): |
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if self.argument is not None: |
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return "{{{}: {}}}".format( |
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self.keyword, |
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self.argument, |
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) |
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else: |
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return "{{{}}}".format(self.keyword) |
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return self.argument |
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@property |
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def as_tuple(self): |
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"""Return the directive as a tuple.""" |
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return (self.keyword, self.argument) |
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class Define(Directive): |
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"""A chord definition. |
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Attributes: |
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def __eq__(self, other): |
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return self.as_tuple == other.as_tuple |
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.. attribute:: key |
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The key, as a :class:`Chord` object. |
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.. attribute:: basefret |
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The base fret, as an integer. Can be `None` if no base fret is defined. |
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.. attribute:: frets |
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The list of frets, as a list of integers, or `None`, if this fret is not to be played. |
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.. attribute:: fingers |
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The list of fingers to use on frets, as a list of integers, or `None` |
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if no information is given (this string is not played, or is played |
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open). Can be `None` if not defined. |
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""" |
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def __init__(self, key, basefret, frets, fingers): |
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self.key = key |
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self.basefret = basefret # Can be None |
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self.frets = frets |
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self.fingers = fingers # Can be None |
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super().__init__("define", None) |
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def __lt__(self, other): |
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return self.as_tuple < other.as_tuple |
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def __str__(self): |
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return None |
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class Tab(AST): |
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"""Tablature""" |
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inline = True |
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_template = "tablature" |
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def __init__(self): |
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super().__init__() |
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@ -402,9 +354,3 @@ class Tab(AST): |
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"""Add an element at the beginning of content.""" |
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self.content.insert(0, data) |
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return self |
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def __str__(self): |
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return '{{start_of_tab}}\n{}\n{{end_of_tab}}'.format( |
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_indent("\n".join(self.content)), |
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) |
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Luthaf
9 years ago
