Function parse_expr

MathBox/mathbox-core.js:33334–33368

()

  function parse_expr() {
    var expecting = state[0].expecting

    state[0].tokens = state[0].tokens || []

    if(state[0].parenlevel === undefined) {
      state[0].parenlevel = 0
      state[0].bracelevel = 0
    }
    if(state[0].parenlevel < 1 && expecting.indexOf(token.data) > -1) {
      return parseexpr(state[0].tokens)
    }
    if(token.data === '(') {
      ++state[0].parenlevel
    } else if(token.data === ')') {
      --state[0].parenlevel
    }

    switch(token.data) {
      case '{': ++state[0].bracelevel; break
      case '}': --state[0].bracelevel; break
      case '(': ++state[0].parenlevel; break
      case ')': --state[0].parenlevel; break
    }

    if(state[0].parenlevel < 0) return unexpected('unexpected `)`')
    if(state[0].bracelevel < 0) return unexpected('unexpected `}`')

    state[0].tokens.push(tokens.shift())
    return

    function parseexpr(tokens) {
      return full_parse_expr(state, tokens), state.shift()
    }
  }

  // node types ---------------