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|
####################################################################
# PLTokenizer.awk #
####################################################################
# Tokenize a string.
function plTokenize(returnTokens, string,
delimiters,
newlines,
quotes,
escapeChars,
leftBlockComments,
rightBlockComments,
lineComments,
reservedOperators,
reservedPatterns,
####
blockCommenting,
c,
currentToken,
escaping,
i,
lineCommenting,
p,
quoting,
r,
s,
tempGroup,
tempPattern,
tempString) {
# Default parameters
if (!delimiters[0]) {
delimiters[0] = " " # whitespace
delimiters[1] = "\t" # horizontal tab
delimiters[2] = "\v" # vertical tab
}
if (!newlines[0]) {
newlines[0] = "\n" # line feed
newlines[1] = "\r" # carriage return
}
if (!quotes[0]) {
quotes[0] = "\"" # double quote
}
if (!escapeChars[0]) {
escapeChars[0] = "\\" # backslash
}
if (!leftBlockComments[0]) {
leftBlockComments[0] = "#|" # Lisp-style extended comment (open)
leftBlockComments[1] = "/*" # C-style comment (open)
leftBlockComments[2] = "(*" # ML-style comment (open)
}
if (!rightBlockComments[0]) {
rightBlockComments[0] = "|#" # Lisp-style extended comment (close)
rightBlockComments[1] = "*/" # C-style comment (close)
rightBlockComments[2] = "*)" # ML-style comment (close)
}
if (!lineComments[0]) {
lineComments[0] = ";" # Lisp-style line comment
lineComments[1] = "//" # C++-style line comment
lineComments[2] = "#" # hash comment
}
if (!reservedOperators[0]) {
reservedOperators[0] = "(" # left parenthesis
reservedOperators[1] = ")" # right parenthesis
reservedOperators[2] = "[" # left bracket
reservedOperators[3] = "]" # right bracket
reservedOperators[4] = "{" # left brace
reservedOperators[5] = "}" # right brace
reservedOperators[6] = "," # comma
}
if (!reservedPatterns[0]) {
reservedPatterns[0] = "[+-]?((0|[1-9][0-9]*)|[.][0-9]*|(0|[1-9][0-9]*)[.][0-9]*)([Ee][+-]?[0-9]+)?" # numeric literal (scientific notation possible)
reservedPatterns[1] = "[+-]?0[0-7]+([.][0-7]*)?" # numeric literal (octal)
reservedPatterns[2] = "[+-]?0[Xx][0-9A-Fa-f]+([.][0-9A-Fa-f]*)?" # numeric literal (hexadecimal)
}
split(string, s, "")
currentToken = ""
quoting = escaping = blockCommenting = lineCommenting = 0
p = 0
i = 1
while (i <= length(s)) {
c = s[i]
r = substr(string, i)
if (blockCommenting) {
if (tempString = startsWithAny(r, rightBlockComments))
blockCommenting = 0 # block comment ends
i++
} else if (lineCommenting) {
if (belongsTo(c, newlines))
lineCommenting = 0 # line comment ends
i++
} else if (quoting) {
currentToken = currentToken c
if (escaping) {
escaping = 0 # escape ends
} else {
if (belongsTo(c, quotes)) {
# Finish the current token
if (currentToken) {
returnTokens[p++] = currentToken
currentToken = ""
}
quoting = 0 # quotation ends
} else if (belongsTo(c, escapeChars)) {
escaping = 1 # escape begins
} else {
# Continue
}
}
i++
} else {
if (belongsTo(c, delimiters) || belongsTo(c, newlines)) {
# Finish the current token
if (currentToken) {
returnTokens[p++] = currentToken
currentToken = ""
}
i++
} else if (belongsTo(c, quotes)) {
# Finish the current token
if (currentToken) {
returnTokens[p++] = currentToken
}
currentToken = c
quoting = 1 # quotation begins
i++
} else if (tempString = startsWithAny(r, leftBlockComments)) {
# Finish the current token
if (currentToken) {
returnTokens[p++] = currentToken
currentToken = ""
}
blockCommenting = 1 # block comment begins
i += length(tempString)
} else if (tempString = startsWithAny(r, lineComments)) {
# Finish the current token
if (currentToken) {
returnTokens[p++] = currentToken
currentToken = ""
}
lineCommenting = 1 # line comment begins
i += length(tempString)
} else if (tempString = startsWithAny(r, reservedOperators)) {
# Finish the current token
if (currentToken) {
returnTokens[p++] = currentToken
currentToken = ""
}
# Reserve token
returnTokens[p++] = tempString
i += length(tempString)
} else if (tempPattern = matchesAny(r, reservedPatterns)) {
# Finish the current token
if (currentToken) {
returnTokens[p++] = currentToken
currentToken = ""
}
# Reserve token
match(r, "^" tempPattern, tempGroup)
returnTokens[p++] = tempGroup[0]
i += length(tempGroup[0])
} else {
# Continue with the current token
currentToken = currentToken c
i++
}
}
}
# Finish the last token
if (currentToken)
returnTokens[p++] = currentToken
}
|
