# Copyright 2008 Google Inc. All Rights Reserved.
# Author: falmeida@google.com (Filipe Almeida)

name = 'jsparser'

comment = 'Simplified finite state machine for tracking of javascript states'

condition('q', '\''),
condition('dq', '\"'),
condition('/', '/'),
condition('*', '*'),
condition('[', '['),
condition(']', ']'),
condition('lf', '\n'),
condition('backslash', '\\'),
condition('default', '[:default:]')

# Main javascript body.
state(name = 'js_text',
      external = 'text',
      transitions = [
        ['q', 'js_q'],
        ['dq', 'js_dq'],
        ['/', 'js_slash'],
        ['default', 'js_text']
      ])

# Single quoted string literal.
state(name = 'js_q',
      external = 'q',
      transitions = [
        ['backslash', 'js_q_e'],
        ['q', 'js_text'],
        ['default', 'js_q']
      ])

# Javascript escaped character in a single quoted string literal.
state(name = 'js_q_e',
      external = 'q',
      transitions = [
        ['default', 'js_q']
      ])

# Double quoted string literal
state(name = 'js_dq',
      external = 'dq',
      transitions = [
        ['backslash', 'js_dq_e'],
        ['dq', 'js_text'],
        ['default', 'js_dq']
      ])

# Javascript escaped character in a double quoted string literal.
state(name = 'js_dq_e',
      external = 'dq',
      transitions = [
        ['default', 'js_dq']
      ])

# Possible start of a javascript comment.
state(name = 'js_slash',
      external = 'text',
      transitions = [
        ['/', 'js_comment_ln'],
        ['*', 'js_comment_ml'],
        ['default', 'js_text']
      ])

# Possible start of a regular expression literal.
#
# The state diagram does not reach this state directly. When js_slash is
# reached, the function enter_state_js_slash() is called, which checks if the
# last token belongs to the set of tokens that can precede a regular
# expression, in which case it changes the state to js_regexp_slash.
#
# For more information please read the comments in
# jsparser.c:enter_state_js_slash().
state(name = 'js_regexp_slash',
      external = 'text',
      transitions = [
        ['/', 'js_comment_ln'],
        ['*', 'js_comment_ml'],
        ['backslash', 'js_regexp_e'],
        ['[', 'js_regexp_bracket'],
        ['default', 'js_regexp']
      ])

# Regular expression literal.
state(name = 'js_regexp',
      external = 'regexp',
      transitions = [
        ['backslash', 'js_regexp_e'],
        ['[', 'js_regexp_bracket'],
        ['/', 'js_text'],
        ['default', 'js_regexp']
      ])

# Regexp bracket expression
state(name = 'js_regexp_bracket',
      external = 'regexp',
      transitions = [
        ['backslash', 'js_regexp_bracket_e'],
        [']', 'js_regexp'],
        ['default', 'js_regexp_bracket']
      ])

# Backslash escaped regexp bracket expression
state(name = 'js_regexp_bracket_e',
      external = 'regexp',
      transitions = [
        ['default', 'js_regexp_bracket']
      ])

# Escaped regular expression char.
state(name = 'js_regexp_e',
      external = 'regexp',
      transitions = [
        ['default', 'js_regexp']
      ])

# Start of a single line javascript comment (//).
state(name = 'js_comment_ln',
      external = 'comment',
      transitions = [
        ['lf', 'js_comment_after'],
        ['default', 'js_comment_ln']
      ])

# Start of a multiline javascript comment (/*).
state(name = 'js_comment_ml',
      external = 'comment',
      transitions = [
        ['*', 'js_comment_ml_close'],
        ['default', 'js_comment_ml']
      ])

# Close of a multiline javascript comment (*/).
state(name = 'js_comment_ml_close',
      external = 'comment',
      transitions = [
        ['/', 'js_comment_after'],
        ['default', 'js_comment_ml']
      ])

# Ending character of a javascript comment.
# In can either be a '/ in the case of a multiline comment, or a line
# terminator in the case of a single line comment.
# This is needed so we don't insert the '/' or the new line character into the
# ring buffer.
state(name = 'js_comment_after',
      external = 'text',
      transitions = [
        ['q', 'js_q'],
        ['dq', 'js_dq'],
        ['/', 'js_slash'],
        ['default', 'js_text']
      ])