mirror of https://github.com/status-im/NimYAML.git
Added token start memory to lexer
This commit is contained in:
Felix Krause
parent
4e97e53489
commit
c104ffec01
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@ -22,6 +22,7 @@ type
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YamlLexerObj* = object
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cur*: LexerToken
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curStartPos*: tuple[line, column: int]
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# ltScalarPart, ltQuotedScalar, ltYamlVersion, ltTagShorthand, ltTagUri,
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# ltLiteralTag, ltTagHandle, ltAnchor, ltAlias
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buf*: string not nil
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@ -41,6 +42,7 @@ type
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LexerState
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blockScalarIndent: int
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c: char
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tokenLineGetter: proc(lex: YamlLexer): string
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YamlLexer* = ref YamlLexerObj
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@ -158,12 +160,45 @@ proc nextIsPlainSafe(lex: YamlLexer, t: typedesc[StringSource],
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proc mark(lex: YamlLexer, t: typedesc[BaseLexer]): int = lex.blSource.bufpos
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proc mark(lex: YamlLexer, t: typedesc[StringSource]): int = lex.sSource.pos
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proc afterMark(lex: YamlLexer, t: typedesc[BaseLexer], m: int): int =
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proc afterMark(lex: YamlLexer, t: typedesc[BaseLexer], m: int): int {.inline.} =
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lex.blSource.bufpos - m
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proc afterMark(lex: YamlLexer, t: typedesc[StringSource], m: int): int =
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proc afterMark(lex: YamlLexer, t: typedesc[StringSource], m: int):
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int {.inline.} =
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lex.sSource.pos - m
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proc lineWithMarker(lex: YamlLexer, t: typedesc[BaseLexer]):
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string =
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if lex.curStartPos.line == lex.blSource.lineNumber:
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result = lex.blSource.getCurrentLine(false) &
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spaces(lex.curStartPos.column - 1) & "^\n"
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else: result = nil
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proc lineWithMarker(lex: YamlLexer, t: typedesc[StringSource]): string =
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var
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lineStartIndex = lex.sSource.pos
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lineEndIndex: int
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curLine = lex.sSource.line
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if lex.curStartPos.line == curLine:
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lineEndIndex = lex.sSource.pos
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while lex.sSource.src[lineEndIndex] notin lineEnd: inc(lineEndIndex)
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while true:
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while lineStartIndex >= 0 and lex.sSource.src[lineStartIndex] notin lineEnd:
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dec(lineStartIndex)
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if curLine == lex.curStartPos.line:
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inc(lineStartIndex)
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break
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let wasLF = lex.sSource.src[lineStartIndex] == '\l'
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lineEndIndex = lineStartIndex
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dec(lineStartIndex)
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if lex.sSource.src[lineStartIndex] == '\c' and wasLF:
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dec(lineStartIndex)
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dec(lineEndIndex)
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dec(curLine)
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result = lex.sSource.src.substr(lineStartIndex,
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lineEndIndex - lineStartIndex - 1) & "\n" &
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spaces(lex.curStartPos.column - 1) & "^"
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# lexer states
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proc outsideDoc[T](lex: YamlLexer): bool
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@ -199,16 +234,20 @@ proc generateError[T](lex: YamlLexer, message: string):
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result.column = lex.columnNumber(T)
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result.lineContent = lex.currentLine(T)
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proc directiveName(lex: YamlLexer, t: typedesc) =
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proc startToken[T](lex: YamlLexer) {.inline.} =
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lex.curStartPos = (lex.lineNumber(T), lex.columnNumber(T))
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proc directiveName[T](lex: YamlLexer) =
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while lex.c notin spaceOrLineEnd:
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lex.buf.add(lex.c)
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lex.advance(t)
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lex.advance(T)
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proc yamlVersion[T](lex: YamlLexer): bool =
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debug("lex: yamlVersion")
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while lex.c in space: lex.advance(T)
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if lex.c notin digits:
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raise generateError[T](lex, "Invalid YAML version number")
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startToken[T](lex)
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lex.buf.add(lex.c)
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lex.advance(T)
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while lex.c in digits:
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@ -235,6 +274,7 @@ proc tagShorthand[T](lex: YamlLexer): bool =
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while lex.c in space: lex.advance(T)
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if lex.c != '!':
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raise generateError[T](lex, "Tag shorthand must start with a '!'")
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startToken[T](lex)
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lex.buf.add(lex.c)
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lex.advance(T)
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@ -257,6 +297,7 @@ proc tagShorthand[T](lex: YamlLexer): bool =
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proc tagUri[T](lex: YamlLexer): bool =
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debug("lex: tagUri")
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while lex.c in space: lex.advance(T)
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startToken[T](lex)
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if lex.c == '!':
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lex.buf.add(lex.c)
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lex.advance(T)
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@ -276,6 +317,7 @@ proc tagUri[T](lex: YamlLexer): bool =
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proc unknownDirParams[T](lex: YamlLexer): bool =
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debug("lex: unknownDirParams")
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while lex.c in space: lex.advance(T)
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startToken[T](lex)
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while lex.c notin lineEnd + {'#'}:
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lex.buf.add(lex.c)
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lex.advance(T)
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@ -293,6 +335,7 @@ proc expectLineEnd[T](lex: YamlLexer): bool =
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lex.advance(T)
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while lex.c notin lineEnd: lex.advance(T)
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of EndOfFile:
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startToken[T](lex)
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lex.nextState = streamEnd
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break
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of '\l':
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@ -356,10 +399,11 @@ proc possibleDocumentEnd[T](lex: YamlLexer): bool =
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proc outsideDoc[T](lex: YamlLexer): bool =
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debug("lex: outsideDoc")
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startToken[T](lex)
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case lex.c
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of '%':
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lex.advance(T)
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lex.directiveName(T)
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directiveName[T](lex)
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case lex.buf
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of "YAML":
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lex.cur = ltYamlDirective
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@ -397,6 +441,7 @@ proc outsideDoc[T](lex: YamlLexer): bool =
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proc insideDoc[T](lex: YamlLexer): bool =
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debug("lex: insideDoc")
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startToken[T](lex)
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lex.indentation = 0
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case lex.c
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of '-':
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@ -419,6 +464,7 @@ proc insideDoc[T](lex: YamlLexer): bool =
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proc possibleIndicatorChar[T](lex: YamlLexer, indicator: LexerToken,
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jsonContext: bool = false): bool =
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startToken[T](lex)
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if not(jsonContext) and lex.nextIsPlainSafe(T, false):
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lex.nextState = plainScalarPart[T]
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result = false
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@ -431,6 +477,7 @@ proc possibleIndicatorChar[T](lex: YamlLexer, indicator: LexerToken,
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lex.nextState = expectLineEnd[T]
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proc flowIndicator[T](lex: YamlLexer, indicator: LexerToken): bool {.inline.} =
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startToken[T](lex)
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lex.cur = indicator
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lex.advance(T)
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while lex.c in space: lex.advance(T)
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@ -476,6 +523,7 @@ proc processQuotedWhitespace[T](lex: YamlLexer, newlines: var int) =
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proc singleQuotedScalar[T](lex: YamlLexer) =
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debug("lex: singleQuotedScalar")
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startToken[T](lex)
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lex.advance(T)
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while true:
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case lex.c
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@ -514,6 +562,7 @@ proc unicodeSequence[T](lex: YamlLexer, length: int) =
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proc doubleQuotedScalar[T](lex: YamlLexer) =
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debug("lex: doubleQuotedScalar")
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startToken[T](lex)
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lex.advance(T)
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while true:
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case lex.c
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@ -580,6 +629,7 @@ proc insideLine[T](lex: YamlLexer): bool =
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lex.cur = ltQuotedScalar
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result = true
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of '>', '|':
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startToken[T](lex)
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if lex.inFlow: lex.nextState = plainScalarPart[T]
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else: lex.nextState = blockScalarHeader[T]
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result = false
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@ -601,6 +651,7 @@ proc insideLine[T](lex: YamlLexer): bool =
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raise generateError[T](lex,
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"Reserved characters cannot start a plain scalar")
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else:
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startToken[T](lex)
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lex.nextState = plainScalarPart[T]
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result = false
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@ -685,6 +736,7 @@ proc blockScalarHeader[T](lex: YamlLexer): bool =
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proc blockScalar[T](lex: YamlLexer): bool =
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debug("lex: blockScalarLine")
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startToken[T](lex)
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result = false
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if lex.blockScalarIndent == UnknownIndentation:
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lex.blockScalarIndent = lex.indentation
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@ -696,6 +748,7 @@ proc blockScalar[T](lex: YamlLexer): bool =
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elif lex.indentation > lex.blockScalarIndent or lex.c == '\t':
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lex.moreIndented = true
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lex.buf.addMultiple(' ', lex.indentation - lex.blockScalarIndent)
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lex.curStartPos.column -= lex.indentation - lex.blockScalarIndent
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else: lex.moreIndented = false
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while lex.c notin lineEnd:
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lex.buf.add(lex.c)
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@ -725,6 +778,7 @@ proc byteSequence[T](lex: YamlLexer) =
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proc tagHandle[T](lex: YamlLexer): bool =
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debug("lex: tagHandle")
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startToken[T](lex)
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lex.advance(T)
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if lex.c == '<':
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lex.advance(T)
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@ -771,6 +825,7 @@ proc tagHandle[T](lex: YamlLexer): bool =
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proc anchorName[T](lex: YamlLexer) =
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debug("lex: anchorName")
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startToken[T](lex)
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while true:
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lex.advance(T)
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case lex.c
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@ -797,6 +852,9 @@ proc streamEnd(lex: YamlLexer): bool =
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lex.cur = ltStreamEnd
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result = true
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proc tokenLine[T](lex: YamlLexer): string =
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result = lex.lineWithMarker(T)
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# interface
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proc init*[T](lex: YamlLexer) =
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@ -805,6 +863,7 @@ proc init*[T](lex: YamlLexer) =
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lex.inlineState = insideLine[T]
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lex.insideLineImpl = insideLine[T]
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lex.insideDocImpl = insideDoc[T]
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lex.tokenLineGetter = tokenLine[T]
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proc newYamlLexer*(source: Stream): YamlLexer =
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let blSource = cast[ptr BaseLexer](alloc(sizeof(BaseLexer)))
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@ -844,4 +903,7 @@ proc setFlow*(lex: YamlLexer, value: bool) =
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proc endBlockScalar*(lex: YamlLexer) =
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lex.inlineState = lex.insideLineImpl
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lex.nextState = lex.insideLineImpl
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lex.nextState = lex.insideLineImpl
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proc getTokenLine*(lex: YamlLexer): string =
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result = lex.tokenLineGetter(lex)
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