mirror of https://github.com/status-im/NimYAML.git
667 lines
27 KiB
Nim
667 lines
27 KiB
Nim
# NimYAML - YAML implementation in Nim
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# (c) Copyright 2015 Felix Krause
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#
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# See the file "copying.txt", included in this
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# distribution, for details about the copyright.
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import typetraits
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type
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DumperState = enum
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dBlockExplicitMapKey, dBlockImplicitMapKey, dBlockMapValue,
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dBlockInlineMap, dBlockSequenceItem, dFlowImplicitMapKey, dFlowMapValue,
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dFlowExplicitMapKey, dFlowSequenceItem, dFlowMapStart,
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dFlowSequenceStart
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ScalarStyle = enum
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sLiteral, sFolded, sPlain, sDoubleQuoted
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proc inspect(scalar: string, indentation: int,
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words, lines: var seq[tuple[start, finish: int]]):
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ScalarStyle {.raises: [].} =
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var
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inLine = false
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inWord = false
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multipleSpaces = true
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curWord, curLine: tuple[start, finish: int]
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canUseFolded = true
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canUseLiteral = true
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canUsePlain = scalar.len > 0 and scalar[0] notin {'@', '`'}
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for i, c in scalar:
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case c
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of ' ':
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if inWord:
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if not multipleSpaces:
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curWord.finish = i - 1
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inWord = false
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else:
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multipleSpaces = true
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inWord = true
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if not inLine:
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inLine = true
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curLine.start = i
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# space at beginning of line will preserve previous and next
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# linebreak. that is currently too complex to handle.
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canUseFolded = false
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of '\l':
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canUsePlain = false # we don't use multiline plain scalars
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curWord.finish = i - 1
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if curWord.finish - curWord.start + 1 > 80 - indentation:
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return if canUsePlain: sPlain else: sDoubleQuoted
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words.add(curWord)
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inWord = false
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curWord.start = i + 1
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multipleSpaces = true
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if not inLine: curLine.start = i
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inLine = false
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curLine.finish = i - 1
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if curLine.start - curLine.finish + 1 > 80 - indentation:
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canUseLiteral = false
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lines.add(curLine)
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else:
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if c in {'{', '}', '[', ']', ',', '#', '-', ':', '?', '%', '"',
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'\''} or c.ord < 32: canUsePlain = false
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if not inLine:
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curLine.start = i
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inLine = true
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if not inWord:
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if not multipleSpaces:
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if curWord.finish - curWord.start + 1 > 80 - indentation:
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return if canUsePlain: sPlain else: sDoubleQuoted
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words.add(curWord)
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curWord.start = i
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inWord = true
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multipleSpaces = false
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if inWord:
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curWord.finish = scalar.len - 1
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if curWord.finish - curWord.start + 1 > 80 - indentation:
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return if canUsePlain: sPlain else: sDoubleQuoted
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words.add(curWord)
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if inLine:
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curLine.finish = scalar.len - 1
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if curLine.finish - curLine.start + 1 > 80 - indentation:
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canUseLiteral = false
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lines.add(curLine)
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if scalar.len <= 80 - indentation:
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result = if canUsePlain: sPlain else: sDoubleQuoted
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elif canUseLiteral: result = sLiteral
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elif canUseFolded: result = sFolded
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elif canUsePlain: result = sPlain
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else: result = sDoubleQuoted
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proc writeDoubleQuoted(scalar: string, s: Stream, indentation: int)
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{.raises: [YamlPresenterOutputError].} =
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var curPos = indentation
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try:
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s.write('"')
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curPos.inc()
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for c in scalar:
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if curPos == 79:
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s.write("\\\l")
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s.write(repeat(' ', indentation))
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curPos = indentation
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if c == ' ':
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s.write('\\')
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curPos.inc()
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case c
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of '"':
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s.write("\\\"")
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curPos.inc(2)
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of '\l':
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s.write("\\n")
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curPos.inc(2)
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of '\t':
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s.write("\\t")
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curPos.inc(2)
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of '\\':
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s.write("\\\\")
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curPos.inc(2)
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else:
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if ord(c) < 32:
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s.write("\\x" & toHex(ord(c), 2))
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curPos.inc(4)
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else:
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s.write(c)
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curPos.inc()
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s.write('"')
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except:
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var e = newException(YamlPresenterOutputError,
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"Error while writing to output stream")
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e.parent = getCurrentException()
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raise e
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proc writeDoubleQuotedJson(scalar: string, s: Stream)
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{.raises: [YamlPresenterOutputError].} =
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try:
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s.write('"')
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for c in scalar:
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case c
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of '"': s.write("\\\"")
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of '\\': s.write("\\\\")
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of '\l': s.write("\\n")
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of '\t': s.write("\\t")
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of '\f': s.write("\\f")
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of '\b': s.write("\\b")
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else:
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if ord(c) < 32:
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s.write("\\u" & toHex(ord(c), 4))
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else:
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s.write(c)
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s.write('"')
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except:
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var e = newException(YamlPresenterOutputError,
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"Error while writing to output stream")
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e.parent = getCurrentException()
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raise e
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proc writeLiteral(scalar: string, indentation, indentStep: int, s: Stream,
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lines: seq[tuple[start, finish: int]])
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{.raises: [YamlPresenterOutputError].} =
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try:
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s.write('|')
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if scalar[^1] != '\l': s.write('-')
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if scalar[0] in [' ', '\t']: s.write($indentStep)
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for line in lines:
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s.write('\l')
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s.write(repeat(' ', indentation + indentStep))
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if line.finish >= line.start:
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s.write(scalar[line.start .. line.finish])
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except:
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var e = newException(YamlPresenterOutputError,
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"Error while writing to output stream")
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e.parent = getCurrentException()
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raise e
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proc writeFolded(scalar: string, indentation, indentStep: int, s: Stream,
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words: seq[tuple[start, finish: int]])
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{.raises: [YamlPresenterOutputError].} =
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try:
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s.write("|-")
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var curPos = 80
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for word in words:
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if word.start > 0 and scalar[word.start - 1] == '\l':
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s.write("\l\l")
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s.write(repeat(' ', indentation + indentStep))
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curPos = indentation + indentStep
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elif curPos + (word.finish - word.start) > 80:
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s.write('\l')
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s.write(repeat(' ', indentation + indentStep))
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curPos = indentation + indentStep
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else:
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s.write(' ')
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curPos.inc()
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s.write(scalar[word.start .. word.finish])
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curPos += word.finish - word.start + 1
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except:
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var e = newException(YamlPresenterOutputError,
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"Error while writing to output stream")
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e.parent = getCurrentException()
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raise e
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template safeWrite(s: string or char) {.dirty.} =
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try:
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target.write(s)
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except:
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var e = newException(YamlPresenterOutputError, "")
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e.parent = getCurrentException()
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raise e
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proc startItem(target: Stream, style: PresentationStyle, indentation: int,
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state: var DumperState, isObject: bool)
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{.raises: [YamlPresenterOutputError].} =
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try:
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case state
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of dBlockMapValue:
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target.write('\l')
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target.write(repeat(' ', indentation))
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if isObject or style == psCanonical:
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target.write("? ")
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state = dBlockExplicitMapKey
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else:
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state = dBlockImplicitMapKey
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of dBlockInlineMap:
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state = dBlockImplicitMapKey
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of dBlockExplicitMapKey:
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target.write('\l')
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target.write(repeat(' ', indentation))
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target.write(": ")
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state = dBlockMapValue
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of dBlockImplicitMapKey:
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target.write(": ")
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state = dBlockMapValue
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of dFlowExplicitMapKey:
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if style != psMinimal:
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target.write('\l')
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target.write(repeat(' ', indentation))
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target.write(": ")
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state = dFlowMapValue
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of dFlowMapValue:
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if (isObject and style != psMinimal) or
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style in [psJson, psCanonical]:
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target.write(",\l" & repeat(' ', indentation))
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if style == psJson:
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state = dFlowImplicitMapKey
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else:
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target.write("? ")
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state = dFlowExplicitMapKey
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elif isObject and style == psMinimal:
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target.write(", ? ")
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state = dFlowExplicitMapKey
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else:
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target.write(", ")
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state = dFlowImplicitMapKey
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of dFlowMapStart:
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if (isObject and style != psMinimal) or
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style in [psJson, psCanonical]:
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target.write("\l" & repeat(' ', indentation))
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if style == psJson:
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state = dFlowImplicitMapKey
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else:
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target.write("? ")
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state = dFlowExplicitMapKey
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else:
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state = dFlowImplicitMapKey
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of dFlowImplicitMapKey:
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target.write(": ")
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state = dFlowMapValue
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of dBlockSequenceItem:
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target.write('\l')
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target.write(repeat(' ', indentation))
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target.write("- ")
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of dFlowSequenceStart:
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case style
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of psMinimal, psDefault:
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discard
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of psCanonical, psJson:
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target.write('\l')
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target.write(repeat(' ', indentation))
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of psBlockOnly:
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discard # can never happen
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state = dFlowSequenceItem
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of dFlowSequenceItem:
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case style
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of psMinimal, psDefault:
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target.write(", ")
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of psCanonical, psJson:
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target.write(",\l")
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target.write(repeat(' ', indentation))
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of psBlockOnly:
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discard # can never happen
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except:
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var e = newException(YamlPresenterOutputError, "")
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e.parent = getCurrentException()
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raise e
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proc anchorName(a: AnchorId): string {.raises: [].} =
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result = ""
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var i = int(a)
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while i >= 0:
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let j = i mod 36
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if j < 26: result.add(char(j + ord('a')))
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else: result.add(char(j + ord('0') - 26))
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i -= 36
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proc writeTagAndAnchor(target: Stream, tag: TagId, tagLib: TagLibrary,
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anchor: AnchorId) {.raises:[YamlPresenterOutputError].} =
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try:
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if tag notin [yTagQuestionMark, yTagExclamationMark]:
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let tagUri = tagLib.uri(tag)
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if tagUri.startsWith(tagLib.secondaryPrefix):
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target.write("!!")
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target.write(tagUri[18..tagUri.high])
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target.write(' ')
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elif tagUri.startsWith("!"):
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target.write(tagUri)
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target.write(' ')
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else:
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target.write("!<")
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target.write(tagUri)
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target.write("> ")
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if anchor != yAnchorNone:
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target.write("&")
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target.write(anchorName(anchor))
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target.write(' ')
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except:
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var e = newException(YamlPresenterOutputError, "")
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e.parent = getCurrentException()
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raise e
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proc present*(s: var YamlStream, target: Stream, tagLib: TagLibrary,
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style: PresentationStyle = psDefault,
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indentationStep: int = 2) =
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var
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indentation = 0
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levels = newSeq[DumperState]()
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cached = initQueue[YamlStreamEvent]()
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while cached.len > 0 or not s.finished():
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let item = if cached.len > 0: cached.dequeue else: s.next()
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case item.kind
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of yamlStartDocument:
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if style != psJson:
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# TODO: tag directives
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try:
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target.write("%YAML 1.2\l")
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if tagLib.secondaryPrefix != yamlTagRepositoryPrefix:
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target.write("%TAG !! " &
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tagLib.secondaryPrefix & '\l')
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target.write("--- ")
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except:
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var e = newException(YamlPresenterOutputError, "")
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e.parent = getCurrentException()
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raise e
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of yamlScalar:
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if levels.len == 0:
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if style != psJson:
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safeWrite('\l')
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else:
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startItem(target, style, indentation, levels[levels.high],
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false)
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if style != psJson:
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writeTagAndAnchor(target,
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item.scalarTag, tagLib, item.scalarAnchor)
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if style == psJson:
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let hint = guessType(item.scalarContent)
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if item.scalarTag in [yTagQuestionMark, yTagBoolean] and
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hint in [yTypeBoolTrue, yTypeBoolFalse]:
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if hint == yTypeBoolTrue:
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safeWrite("true")
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else:
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safeWrite("false")
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elif item.scalarTag in [yTagQuestionMark, yTagNull] and
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hint == yTypeNull:
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safeWrite("null")
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elif item.scalarTag in [yTagQuestionMark, yTagInteger] and
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hint == yTypeInteger:
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safeWrite(item.scalarContent)
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elif item.scalarTag in [yTagQuestionMark, yTagFloat] and
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hint in [yTypeFloatInf, yTypeFloatNaN]:
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raise newException(YamlPresenterJsonError,
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"Infinity and not-a-number values cannot be presented as JSON!")
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elif item.scalarTag in [yTagQuestionMark, yTagFloat] and
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hint == yTypeFloat:
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safeWrite(item.scalarContent)
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else:
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writeDoubleQuotedJson(item.scalarContent, target)
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elif style == psCanonical:
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writeDoubleQuoted(item.scalarContent, target,
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indentation + indentationStep)
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else:
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var words, lines = newSeq[tuple[start, finish: int]]()
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case item.scalarContent.inspect(indentation + indentationStep,
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words, lines)
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of sLiteral: writeLiteral(item.scalarContent, indentation,
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indentationStep, target, lines)
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of sFolded: writeFolded(item.scalarContent, indentation,
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indentationStep, target, words)
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of sPlain: safeWrite(item.scalarContent)
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of sDoubleQuoted: writeDoubleQuoted(item.scalarContent, target,
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indentation + indentationStep)
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of yamlAlias:
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if style == psJson:
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raise newException(YamlPresenterJsonError,
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"Alias not allowed in JSON output")
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assert levels.len > 0
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startItem(target, style, indentation, levels[levels.high], false)
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try:
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target.write('*')
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target.write(cast[byte]('a') + cast[byte](item.aliasTarget))
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except:
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var e = newException(YamlPresenterOutputError, "")
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e.parent = getCurrentException()
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raise e
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of yamlStartSequence:
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var nextState: DumperState
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case style
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of psDefault:
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var length = 0
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while true:
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assert(not(s.finished()))
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let next = s.next()
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cached.enqueue(next)
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case next.kind
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of yamlScalar:
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length += 2 + next.scalarContent.len
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of yamlAlias:
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length += 6
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of yamlEndSequence:
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break
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else:
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length = high(int)
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break
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nextState = if length <= 60: dFlowSequenceStart else:
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dBlockSequenceItem
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of psJson:
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if levels.len > 0 and levels[levels.high] in
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[dFlowMapStart, dFlowMapValue]:
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raise newException(YamlPresenterJsonError,
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"Cannot have sequence as map key in JSON output!")
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nextState = dFlowSequenceStart
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of psMinimal, psCanonical:
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nextState = dFlowSequenceStart
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of psBlockOnly:
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nextState = dBlockSequenceItem
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if levels.len == 0:
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if nextState == dBlockSequenceItem:
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if style != psJson:
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writeTagAndAnchor(target,
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item.seqTag, tagLib, item.seqAnchor)
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else:
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if style != psJson:
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writeTagAndAnchor(target,
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item.seqTag, tagLib, item.seqAnchor)
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safeWrite('\l')
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indentation += indentationStep
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else:
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startItem(target, style, indentation, levels[levels.high], true)
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if style != psJson:
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writeTagAndAnchor(target,
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item.seqTag, tagLib, item.seqAnchor)
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indentation += indentationStep
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if nextState == dFlowSequenceStart:
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safeWrite('[')
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if levels.len > 0 and style in [psJson, psCanonical] and
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levels[levels.high] in
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[dBlockExplicitMapKey, dBlockMapValue,
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dBlockImplicitMapKey, dBlockSequenceItem]:
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indentation += indentationStep
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levels.add(nextState)
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of yamlStartMap:
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var nextState: DumperState
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case style
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of psDefault:
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type MapParseState = enum
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mpInitial, mpKey, mpValue, mpNeedBlock
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var mps: MapParseState = mpInitial
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while mps != mpNeedBlock:
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case s.peek().kind
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of yamlScalar, yamlAlias:
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case mps
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of mpInitial: mps = mpKey
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of mpKey: mps = mpValue
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else: mps = mpNeedBlock
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of yamlEndMap:
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break
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else:
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mps = mpNeedBlock
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nextState = if mps == mpNeedBlock: dBlockMapValue else:
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dBlockInlineMap
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of psMinimal:
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nextState = dFlowMapStart
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of psCanonical:
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nextState = dFlowMapStart
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of psJson:
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if levels.len > 0 and levels[levels.high] in
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[dFlowMapStart, dFlowMapValue]:
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raise newException(YamlPresenterJsonError,
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"Cannot have map as map key in JSON output!")
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nextState = dFlowMapStart
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of psBlockOnly:
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nextState = dBlockMapValue
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if levels.len == 0:
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if nextState == dBlockMapValue:
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if style != psJson:
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writeTagAndAnchor(target,
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item.mapTag, tagLib, item.mapAnchor)
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else:
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if style != psJson:
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safeWrite('\l')
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writeTagAndAnchor(target,
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item.mapTag, tagLib, item.mapAnchor)
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indentation += indentationStep
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else:
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if nextState in [dBlockMapValue, dBlockImplicitMapKey]:
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startItem(target, style, indentation, levels[levels.high],
|
|
true)
|
|
if style != psJson:
|
|
writeTagAndAnchor(target,
|
|
item.mapTag, tagLib, item.mapAnchor)
|
|
else:
|
|
startItem(target, style, indentation, levels[levels.high],
|
|
true)
|
|
if style != psJson:
|
|
writeTagAndAnchor(target,
|
|
item.mapTag, tagLib, item.mapAnchor)
|
|
indentation += indentationStep
|
|
|
|
if nextState == dFlowMapStart:
|
|
safeWrite('{')
|
|
if levels.len > 0 and style in [psJson, psCanonical] and
|
|
levels[levels.high] in
|
|
[dBlockExplicitMapKey, dBlockMapValue,
|
|
dBlockImplicitMapKey, dBlockSequenceItem]:
|
|
indentation += indentationStep
|
|
levels.add(nextState)
|
|
|
|
of yamlEndSequence:
|
|
assert levels.len > 0
|
|
case levels.pop()
|
|
of dFlowSequenceItem:
|
|
case style
|
|
of psDefault, psMinimal, psBlockOnly:
|
|
safeWrite(']')
|
|
of psJson, psCanonical:
|
|
indentation -= indentationStep
|
|
try:
|
|
target.write('\l')
|
|
target.write(repeat(' ', indentation))
|
|
target.write(']')
|
|
except:
|
|
var e = newException(YamlPresenterOutputError, "")
|
|
e.parent = getCurrentException()
|
|
raise e
|
|
if levels.len == 0 or levels[levels.high] notin
|
|
[dBlockExplicitMapKey, dBlockMapValue,
|
|
dBlockImplicitMapKey, dBlockSequenceItem]:
|
|
continue
|
|
of dFlowSequenceStart:
|
|
if levels.len > 0 and style in [psJson, psCanonical] and
|
|
levels[levels.high] in
|
|
[dBlockExplicitMapKey, dBlockMapValue,
|
|
dBlockImplicitMapKey, dBlockSequenceItem]:
|
|
indentation -= indentationStep
|
|
safeWrite(']')
|
|
of dBlockSequenceItem:
|
|
discard
|
|
else:
|
|
assert false
|
|
indentation -= indentationStep
|
|
of yamlEndMap:
|
|
assert levels.len > 0
|
|
let level = levels.pop()
|
|
case level
|
|
of dFlowMapValue:
|
|
case style
|
|
of psDefault, psMinimal, psBlockOnly:
|
|
safeWrite('}')
|
|
of psJson, psCanonical:
|
|
indentation -= indentationStep
|
|
try:
|
|
target.write('\l')
|
|
target.write(repeat(' ', indentation))
|
|
target.write('}')
|
|
except:
|
|
var e = newException(YamlPresenterOutputError, "")
|
|
e.parent = getCurrentException()
|
|
raise e
|
|
if levels.len == 0 or levels[levels.high] notin
|
|
[dBlockExplicitMapKey, dBlockMapValue,
|
|
dBlockImplicitMapKey, dBlockSequenceItem]:
|
|
continue
|
|
of dFlowMapStart:
|
|
if levels.len > 0 and style in [psJson, psCanonical] and
|
|
levels[levels.high] in
|
|
[dBlockExplicitMapKey, dBlockMapValue,
|
|
dBlockImplicitMapKey, dBlockSequenceItem]:
|
|
indentation -= indentationStep
|
|
safeWrite('}')
|
|
of dBlockMapValue, dBlockInlineMap:
|
|
discard
|
|
else:
|
|
assert false
|
|
indentation -= indentationStep
|
|
of yamlEndDocument:
|
|
if finished(s): break
|
|
safeWrite("...\l")
|
|
|
|
proc transform*(input: Stream, output: Stream, style: PresentationStyle,
|
|
indentationStep: int = 2) =
|
|
var
|
|
taglib = initExtendedTagLibrary()
|
|
parser = newYamlParser(tagLib)
|
|
events = parser.parse(input)
|
|
try:
|
|
if style == psCanonical:
|
|
var specificTagEvents = iterator(): YamlStreamEvent =
|
|
for e in events:
|
|
var event = e
|
|
case event.kind
|
|
of yamlStartDocument, yamlEndDocument, yamlEndMap,
|
|
yamlAlias, yamlEndSequence:
|
|
discard
|
|
of yamlStartMap:
|
|
if event.mapTag in [yTagQuestionMark,
|
|
yTagExclamationMark]:
|
|
event.mapTag = yTagMap
|
|
of yamlStartSequence:
|
|
if event.seqTag in [yTagQuestionMark,
|
|
yTagExclamationMark]:
|
|
event.seqTag = yTagSequence
|
|
of yamlScalar:
|
|
if event.scalarTag == yTagQuestionMark:
|
|
case guessType(event.scalarContent)
|
|
of yTypeInteger:
|
|
event.scalarTag = yTagInteger
|
|
of yTypeFloat, yTypeFloatInf, yTypeFloatNaN:
|
|
event.scalarTag = yTagFloat
|
|
of yTypeBoolTrue, yTypeBoolFalse:
|
|
event.scalarTag = yTagBoolean
|
|
of yTypeNull:
|
|
event.scalarTag = yTagNull
|
|
of yTypeUnknown:
|
|
event.scalarTag = yTagString
|
|
elif event.scalarTag == yTagExclamationMark:
|
|
event.scalarTag = yTagString
|
|
yield event
|
|
var s = initYamlStream(specificTagEvents)
|
|
present(s, output, tagLib, style,
|
|
indentationStep)
|
|
else:
|
|
present(events, output, tagLib, style, indentationStep)
|
|
except YamlStreamError:
|
|
var e = getCurrentException()
|
|
while e.parent of YamlStreamError: e = e.parent
|
|
if e.parent of IOError:
|
|
raise (ref IOError)(e.parent)
|
|
elif e.parent of YamlParserError:
|
|
raise (ref YamlParserError)(e.parent)
|
|
else:
|
|
# never happens
|
|
assert(false)
|
|
except YamlPresenterJsonError:
|
|
raise (ref YamlPresenterJsonError)(getCurrentException())
|
|
except YamlPresenterOutputError:
|
|
raise (ref YamlPresenterOutputError)(getCurrentException()) |